Liebert® PEX+ Series Precision Air Conditioning · Various components such as compressors,...

I

Liebert® PEX+ Series

Precision Air Conditioning User Manual

II Vertiv I Liebert PEX+ I User Manual

Copyright by Vertiv Co. Ltd. The content in this document is subject to change without notice. All rights, including rights of

translation, reproduced by printing, copying or similar methods, and even of parts, are

reserved. Violators will be liable for damages. All rights, including rights deriving from patent

license or registration of a utility model or design, are reserved. No part of this document may

be reproduced or transmitted in any form or by any means without the prior written consent of

Vertiv Co. Ltd.

Notice The purchased products, services, and features are stipulated by the contract made between

Vertiv Co. and the customer. All or part of the products, services, and features described in this

document may not be within the purchasing scope or the usage scope. Unless otherwise

specified in the contract, all statements, information, and recommendations in this document

are provided "AS IS" without warranties, guarantees or representations of any kind, either

express or implied. The information in this document is subject to change without notice.

Every effort has been made in the preparation of this document to ensure the accuracy of the

contents, but all statements, information, and recommendations in this document do not

constitute a warranty of any kind, express or implied.

Vertiv Co., Ltd.

• China

Website: www.vertivco.com

E-mail: [email protected]

Customer service hotline: 4008876510 • Asia Pacific

Homepage: www.vertivco.com.

E-mail: [email protected]

For Technical Support, users may contact the nearest Vertiv Co. local sales office or service centre.

http://www.vertivco.com/

mailto:[email protected]

http://www.vertivco.com/

mailto:[email protected]

III Vertiv I Liebert PEX+ I User Manual

Purpose of the Document This document applies to the series of precision air conditioners and cooling solutions which

maintain an optimal environmental control of technological ecosystems at minimal operating

costs. This document gives an overview of the specifications, installation, commissioning and

maintenance procedures with troubleshooting from the user perspective. The figures used in

this document are for reference only.

Please read this manual carefully before installing, maintaining, and troubleshooting.

Styling used in this Guide The styles used in the manual will be defined as mentioned in the following table:

Situation Description

Warning/Danger/Caution

The Warning/Danger/Caution note indicates a

hazardous or potentially harmful situation that can

result in death or injury. It also indicates

instructions that need to be adhered to, failing

which may result in danger and safety issues

thereby having an adverse effect on the reliability

of the device and security. Even for practices not

related to physical injury, the content under the

Warning heading is used for precautions which

need to be taken which, otherwise, could result in

equipment damage, performance degradation, or

interruption in service.

Note

The Note section indicates additional and useful information. It also calls attention to best practices and industry-best protocols that are standardized and help make maximum utilization of the resources at hand. Helpful information related to the product also comes under the Note heading, helping the users with the definitions, concepts, and terminologies used in the manual.

Version History Issue Revision Change

31013273 V1.0 -

IV Vertiv I Liebert PEX+ I User Manual

Safety Precautions and Measures The important safety precautions and measures that should be followed during the

installation and maintenance are described in the following sections.

Read the manual prior to installation and operation of the unit. Only qualified personnel should

move, install, or service this equipment.

The user reads and considers all the precautions, compliance, and safety measures before

working on the equipment. The unit control must be used exclusively for the purpose which it

is intended for; the manufacturer takes no liability for incorrect use or a modification to the

unit control.

Adhere to all the Warnings and Cautionary measures included in the manual.

Please read this manual carefully before installing, maintaining and

troubleshooting; especially the Warning/ Danger/ Caution information in the

User Guide. Apart from the User Guide, also pay attention to the warning labels

on the unit and its components.

This manual is retained for the entire service life of the machine. The user must read all the

precautions, danger, warnings, and cautionary measures mentioned in the manual prior to

carrying out any operations on the machine. Each machine is equipped with an electric

insulation which allows the users to work in safe conditions. The main switch is positioned on

the electrical panel cover; Open the right door to access it. Before any maintenance operation,

switch off the machine with this electronic insulation device to eliminate risks such as

electrical shocks, burns, automatic restarting, moving parts, and remote control. The panel key,

supplied along with the unit, must be kept by the personnel responsible for the maintenance.

The protective covers can be removed after the electric power has been cut off by opening

the main switch.

In the following sections, look at the various cautionary measures and warnings that need to

be read carefully prior to installing or operating the system.

Disconnect the local and remote power supplies prior to working with the unit.

Prior to the installation process, read all the instructions, verify if all the parts are in place, and

check the nameplate to ensure that the voltage matches the utility power that is available for

that unit.

The controller doesn’t isolate power from the unit even in the Off mode. Moreover, some

internal components require and receive power even during the Off mode.

If the unit door is open while the fans are operating, the airflow may result in abrupt slamming

of the door resulting in injury. Another aspect is the presence of small objects in the fans bay

V Vertiv I Liebert PEX+ I User Manual

which may result in object ejection during the fan start-up and there is a probable risk of being

hit by these objects leading to grievous injury as well as causing equipment damage.

The unit contains fluids and gasses under high pressure. Therefore, the pressure should be

relieved before working with the piping.

Various components such as compressors, refrigerant discharge lines, and humidifiers are

extremely hot during the unit operation. Therefore, allow sufficient time for the unit to cool

down before working with the unit cabinet. Handle the unit with extreme caution and wear

safety equipment such as protective gloves, safety shoes, and arm protection while working

with the hot compressors, discharge lines, and reheats.

There is a risk of leaking water that can cause damage to the equipment as well as the

building. There should be an effective water drain connection and facilities. Installation should

be precise. Implementation of the application and service practices should be suitable and

fault-free. Not complying with these norms will result in water leakage from the unit. Water

leakage can result in massive damage and loss of critical equipment in the hosting ecosystem.

Therefore, care should be taken to ensure that the unit must not be located directly above any

equipment that could sustain damage due to water and excessive moisture. Using a leak

detection system for the unit and system supply lines are recommended by Vertiv Co.

VI Vertiv I Liebert PEX+ I User Manual

TABLE OF CONTENTS

PART I GENERAL INFORMATION ........................................................ 1

1 Product Overview ............................................................................. 2

1.1 Product Introduction ................................................................................................................. 2

1.2 Model Description ....................................................................................................................... 3

1.3 Model Nomenclature .................................................................................................................. 4

1.4 Components of PEX+ model .................................................................................................... 5

1.4.1 Compressor.................................................................................................................. 5

1.4.2 Evaporator ................................................................................................................... 5

1.4.3 Thermal Expansion Valve ......................................................................................... 6

1.4.4 Infrared humidifier ...................................................................................................... 6

1.4.5 EC Fans ......................................................................................................................... 7

1.4.6 Electric Heater ............................................................................................................ 7

1.4.7 Sight Glass ................................................................................................................... 8

1.4.8 iCOM-Controller .......................................................................................................... 8

1.4.9 Filter Drier .................................................................................................................... 9

1.4.10 Condenser .................................................................................................................... 9

1.5 Optional Components ......................................................................................................... 10

1.5.1 Electronic Expansion Valve (EEV) ......................................................................... 10

1.5.2 Electrode humidifier ................................................................................................. 10

1.5.3 Extended piping kit .................................................................................................. 11

1.5.4 Low temperature kit ................................................................................................. 11

1.5.5 Two stage electric heater ....................................................................................... 11

1.5.6 Up flow Plenum ......................................................................................................... 11

1.5.7 High efficiency Filter ................................................................................................ 11

1.5.8 Water leakage alarm................................................................................................. 11

1.5.9 Smoke and fire detectors ........................................................................................ 12

1.5.10 Supply Air Temperature Sensor ............................................................................ 12

1.5.11 Supply Air Pressure Sensor .................................................................................... 12

VII Vertiv I Liebert PEX+ I User Manual

1.5.12 Remote Sensor .......................................................................................................... 12

1.5.13 Smoke sensor ............................................................................................................ 12

1.5.14 IS - Unity card ............................................................................................................ 12

1.6 Working Conditions ............................................................................................................. 13

1.6.1 Storage Environment ............................................................................................... 13

1.6.2 Operating Environment ........................................................................................... 13

PART II INSTALLATION ....................................................................... 14

2. Installation ....................................................................................... 15

2.1 Pre-installation ..................................................................................................................... 15

2.1.1 Transportation & Movement .................................................................................. 15

2.1.2 Unpacking .................................................................................................................. 16

2.1.3 Inspection ................................................................................................................... 17

2.2 Installation Preparation (Site Preparation) .................................................................... 18

2.2.1 Equipment Room Requirement .............................................................................. 18

2.2.2 Installation Space requirements ............................................................................ 19

2.2.3 Maintenance Space requirement ........................................................................... 19

2.3 Installation Tools .................................................................................................................. 20

2.4 System Arrangement during Installation ........................................................................ 21

2.5 System Installation Mode ................................................................................................... 22

2.6 Product Dimensions ............................................................................................................ 23

2.6.1 Indoor Unit ................................................................................................................. 23

2.6.2 Plenum dimensions (for Upflow unit) ................................................................... 24

2.7 Dimensions and weight of condenser .............................................................................. 25

2.8 Positions and dimensions of air outlet ............................................................................. 25

2.8.1 Base pallet cut-out location dimensions .............................................................. 25

2.8.2 Position and dimensions of air outlet on top cover ............................................ 26

2.8.3 Side panel knock-out locations .............................................................................. 27

2.9 Indoor Unit Installation ....................................................................................................... 28

2.9.1 Base Installation ........................................................................................................ 28

2.9.2 Vibration absorbing ................................................................................................. 28

2.9.3 Unit Cabinet ............................................................................................................... 28

2.10 Piping .................................................................................................................................... 28

VIII Vertiv I Liebert PEX+ I User Manual

2.10.1 Connecting condensate drain pipe of indoor unit ............................................. 29

2.10.2 Connecting water inlet pipe of humidifier .......................................................... 29

2.10.3 Connecting the pipes of electrode humidifier (for the unit that uses electrode humidifier) ........................................................................................................... 30

2.10.4 Connecting copper pipes (discharge pipe and liquid pipe) between indoor unit and condenser .............................................................................................................. 30

2.10.5 Pipe Extension Kit (Optional) ....................................................................................... 33

2.11 Lowering the Fan (For Down Flow Unit) ......................................................................... 34

2.12 Removing Fastener and Vibration Absorber ................................................................ 36

2.12.1 Removing transportation fixing plate of compressor ..................................... 36

2.12.2 Removing fastener of infrared humidifier ......................................................... 37

2.12.3 Removing pipe fasteners ...................................................................................... 37

2.13 Installation Inspection ....................................................................................................... 38

2.14 Electrical Installation ......................................................................................................... 39

2.14.1 Installation Notes ................................................................................................... 39

2.14.2 Wiring of Indoor Unit .............................................................................................. 39

2.14.3 Wiring of Condenser .............................................................................................. 43

2.14.4 Electrical Installation Inspection ......................................................................... 44

PART III SYSTEM OPERATION AND GENERAL MAINTENANCE ...45

3. Controller Operation ..................................................................... 46

3.1 iCOM Display Components & Functions ......................................................................... 46

3.2 Control Interface - Large Display...................................................................................... 48

3.3 Operation ............................................................................................................................... 52

3.3.1 Single Unit Functions ............................................................................................. 52

3.3.2 Setpoints .................................................................................................................. 55

3.3.3 User-Graphic Menu Screens ................................................................................ 56

3.3.4 Event Log ................................................................................................................. 57

3.3.5 View Network .......................................................................................................... 57

3.3.6 User-Set Alarms Menu Screens ........................................................................... 57

3.3.7 User- User-Sensor Data Menu Screens .............................................................. 57

3.3.8 User-Display Setup Menu Screen ....................................................................... 58

3.3.9 User-Total Run Hours Menu Screens ................................................................. 59

IX Vertiv I Liebert PEX+ I User Manual

3.3.10 User-Sleep Mode Menu Screens.......................................................................... 59

3.4 Event Types and Properties .............................................................................................. 59

3.4.1 Event Types ............................................................................................................. 59

4 INTELLISLOT ................................................................................... 63

4.1 Introduction of IS Unity Card ............................................................................................. 63

4.2 Installing Host Communication Card ............................................................................... 63

4.2.1 Installing communication card ............................................................................... 63

4.2.2 Connection ................................................................................................................. 64

4.3 Commissioning of Host Communication Component ................................................... 64

4.3.1 Assigning the Card’s IP Address ......................................................................... 64

4.3.2 Connect an Ethernet Cable .................................................................................. 65

4.3.3 Connect an RS-485 Serial Cable .......................................................................... 66

4.4 Configure the Card .............................................................................................................. 67

4.4.1 Enable Protocols ..................................................................................................... 68

5 System Maintenance & Troubleshooting ................................... 74

5.1 Monthly Routine Inspection Items .................................................................................... 75

5.2 Routine Biannual Inspection .............................................................................................. 76

5.3 Self-diagnosis Function ...................................................................................................... 77

5.4 Electrical Connection Inspection ...................................................................................... 77

5.5 Control Component Appearance Inspection .................................................................. 77

5.6 Air Filter ................................................................................................................................. 79

5.7 Infrared Humidifier .............................................................................................................. 79

5.8 Electric Heater ...................................................................................................................... 80

6 Appendix – Circuit Diagram ......................................................... 84

1

PART I

GENERAL INFORMATION

2 Vertiv I Liebert PEX+ I User Manual

1 Product Overview

1.1 Product Introduction The Liebert PEX+ series is the next generation series of air conditioners that provide precise

environmental control. The Liebert PEX+ models are the latest in the long line of modern

enterprise-grade products from the Liebert family. Incorporating the high standards associated

with the Liebert name, the PEX+ series utilizes the latest technology, system components, and

streamlined manufacturing process.

Liebert PEX+ air conditioners are products that are specifically created and designed for the

data centers, computer rooms, and similar ecosystems which call for a high degree of accuracy

and precision. It addresses the needs and challenges associated with such applications and

setups. It caters to sensitive applications which need a suitable environment for optimal

performance. Therefore, care should be taken while testing these sensitive products or

maintaining a favorable environment for mission critical equipment, as even a slight deviation

may lead to inaccurate results. Precision Air Conditioning must not only keep room conditions

within a specific range but also must have the precision to react quickly to a drastic change in

heat load and prevent wide temperature fluctuations.

The PEX+ air cooled AC unit is packed with features such as high reliability, high sensible heat

ratio, and large airflow. It is an excellent system that adheres to the standards in Precision Air

Cooling in terms of energy-efficiency, space requirements, and reliability.


1.2 Model Description The Liebert PEX+ appearance is shown in Figure 1-1.

Figure 1-1 PEX+ Model

Figure 1-2 Main Components


1.3 Model Nomenclature The model of the PEX+ series AC is fully-defined by twenty-five digits, as shown in Figure 1-3.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

P 1 0 5 0 D A 1 3 S H S 1 2 S 1 D 0 0 0 C E 0 L 0

Digit 1 Product model Digit 16 Enclosure options

P PEX+ 1 Standard Color black orange peel grain coating

Digit 2 Product model 2 White orange peel grain coating

1-2 Number of Modules/Bays 6 Color Charcoal grey

Digit 3 Cooling Capacity kW Digit 17 Mains Switch High Voltage Option

0-9 Nominal Net Cooling Capacity - kW D Main non-Locking Disconnect

Digit 4 Cooling Capacity kW P Dual Power Supply Parallel

0-9 Nominal Net Cooling Capacity - kW A Dual Power Supply Auto Alternate(Interlocking contactor

Digit 5 Cooling Capacity kW T Dual Power Supply Auto Alternate(ATS)

0-9 Nominal Net Cooling Capacity - kW Digit18 Lock Out Low Voltage Option

Digit 6 Air Discharge 0 None

U Upflow H Reheat & Humidity Lockout

D Downflow Digit 19 Monitoring

Digit 7 System type 0 No Card

A Air cooled 7 Unity card

W Water cooled 8 Unity card*2

D Dual Cool-Chilled water+Air cooled Digit 20 Sensors

H Dual Cool-Chilled water+Water cooled 0 None

Digit8 Airflow S Smoke Sensor

1 EC plug fan-Standard Static H High Temperature

Digit 9 Power Supply F Smoke & High Temp

3 380-415V / 3ph / 50Hz+N R Remote sensor

T 380V / 3ph / 60Hz+N N Supply Air Temperature Sensor

Digit 10 Cooling System A Supply air pressure sensor

C Compliant Scroll Single Circuit, R407C X Other sensors

S Compliant Scroll Dual Circuit, R407C Digit 21 Packaging

E Digital Scroll Single Circuit, R407C P Packaging - Standard Cardboard and Wooden Pallet

D Digital Scroll Dual Circuit, R407C C Packaging - Wooden crate

4 Compliant Scroll Single Circuit, R410A Digit 22 Special Requirements

6 Compliant Scroll Dual Circuit, R410A E For Export

7 Digital Scroll Single Circuit, R410A Digit 23 Order Identifier

T Digital Scroll Dual Circuit, R410A 0 Standard Static

Digit 11 Humidification 1 High ESP 100 Pa

0 None 2 High ESP 200 Pa

H Infrared Humidifier 3 High Airflow/ESP other

S Electrode humidifier X SFA Included

Digit 12 Display Digit 24 Order Identifier

S Standard Display 0 None

L Large Display L Air cooled-long piping>30m

Digit 13 Re-Heating C Low temp Kits

0 None B Low temp Kits+Long piping

1 Electric heating Std 1 Stage X SFA Included

2 Electric heating Opt. 2 Stage Digit 25 Order Identifier

Digit 14 Filtration 0 None

2 G4 X SFA Included

3 F5

Digit 15 Coil and Valves

S Standard DX Air cooled coil，TXV

E Standard DX Air cooled coil，EEV

Figure 1-3 - Nomenclature


1.4 Components of PEX+ model An overview of the main components, optional components and features of the PEX+ AC

series is mentioned in this section.

1.4.1 Compressor

The Liebert PEX+ series models comprise of a Copeland scroll compressor which has a host of promising features such as low operating noise, less vibration, and high reliability. The Rotalock (screw thread) connection mode makes the maintenance easier. Its compactness, smooth compression with scroll operation and high energy efficiency ratio make it an ideal compressor to bank on for the PEX+ series.

Figure 1-4 Compressor

1.4.2 Evaporator

The evaporator consists of a V-coil (for up flow)/A-coil (for down flow) incorporating draw-through air design for uniform air distribution. The coil is constructed of enhanced surface aluminum fins mechanically bonded to enhanced surface copper tubes. The coil frame is fabricated from hot dipped galvanized sheet metal and the stainless-steel condensate drip tray. Hydrophilic coating on cooling coil enhances longevity.

The sophisticated design of the distributor ensures that the refrigerant is distributed evenly in each loop, thereby improving the effectiveness of the heat exchanger.

Figure 1-5 Evaporator


1.4.3 Thermal Expansion Valve

The thermal expansion valve with external equalizer can automatically regulate refrigerant

flow according to the operation condition of the refrigeration system to optimize the

performance of the unit in the change of indoor and outdoor temperature.

Figure 1-6 Thermal Expansion Valve

1.4.4 Infrared humidifier

The infrared humidifier consists of infrared humidifier lamp, water injection valve, humidifying

water dish, temperature alarm protection devices and water level alarm device.

The infrared humidifier in the Liebert PEX+ series provides quicker and more responsive

operation which is quite important for mission-critical applications. These humidifiers reduce

the dependency of water quality and simultaneously achieve full capacity in quick time using

almost any water quality.

Figure 1-7 Infrared Humidifier


1.4.5 EC Fans

The EC Fans used in the Liebert PEX+ models are energy-efficient and innovative with

integrated electronics and a maintenance-free design.

• Ability to regulate the airflow and reduce the fan input power leading to high energy-

efficiency

• Easy-to-connect facility with minimum wiring leading to high performance with a great

variety of possible air flow rates

Figure 1-8 EC Fans

1.4.6 Electric Heater

In the PEX+ models, the PTC heaters are used as they have lower running temperatures,

thereby ensuring operational safety.

• Less susceptible to overheating and long lasting due to less wear

• Lower Maintenance and Smooth operation

Figure 1-9 Electric Heater


1.4.7 Sight Glass

The sight glass is a utility for observing the refrigerant state; specifically, the moisture content

of the system. If the moisture content exceeds the levels of defined standards the color

changes, thereby, indicating irregularity in the moisture content.

Figure 1-10 Sight Glass

1.4.8 iCOM-Controller

The iCOM controller used in PEX+ provides a simple operational user-interface and is

developed using the latest and highly advanced PID regulation technology.

Liebert iCOM’s menu-driven display is used for all programming functions on each connected cooling unit. The Status menu displays the status of the conditioned space, such as room temperature and humidity, temperature and humidity setpoints, alarm status and settings, event histories and the current time.

Figure 1-11 iCOM Controller


1.4.9 Filter Drier

Moisture can have an adverse effect on the operation and life of a system in the refrigeration

cycle.

To counter that effect, Filter-driers are used to filter out particles and remove and hold

moisture to prevent it from circulating through the system.

Figure 1-12 Filter Drier

1.4.10 Condenser

The Liebert range of air conditioners offers many advantages, some of which are listed below:

• Antirust aluminum cabinets

• Low sound levels

• High reliability over a wide range of ambient conditions

Figure 1-13 Condenser

For more information on the condenser, refer to the Liebert LSF Condenser manual

which explains the entire condenser system in detail.


1.5 Optional Components

1.5.1 Electronic Expansion Valve (EEV)

The EEV is designed for modulating control of the refrigerant mass flow with precision. The

EEV collects temperature and pressure signals at the same time to accurately regulate the

refrigerant flow. The EEV's wide operating envelope also lowers down the condensing

pressure, thereby resulting in significant energy savings.

• Designed for modulating control of the refrigerant mass flow with precision

• Ensures effective control on super-heating at the end of the evaporator

• Better low load capacity

• Designed for easy Installation-and-Service

Figure 1-14 Electronic Expansion Valve

1.5.2 Electrode humidifier

The electrode humidifier uses the electrodes to boil the water in humidifier tank to produce

steam for humidifying purpose. It has a different requirement for water quality and sizes of

inlet/outlet pipes with respect to the standard infrared humidifier.

Figure 1-15 Electrode Humidifier


1.5.3 Extended piping kit

If there is a requirement for long-distance piping/high vertical rise between the indoor unit and

condenser according to actual application condition, an extension kit will be configured and

the specific selection of pipes is done as per the values described in Table 7.6.

1.5.4 Low temperature kit

To ensure the air conditioner can start normally in areas where the outdoor temperature is low,

a low-temp kit is configured to effectively provide low voltage as required at the startup of the

unit. This is done to avoid startup failure of the unit caused by low pressure.

1.5.5 Two stage electric heater

The two-stage heater can be selected based on the heating requirement. The electric heater

can be divided into two stages by configuring the controller. The heater starts up step-wise

according to the heating requirement. It not only maintains the room temperature but also

reduces the energy consumption.

Figure 1-16 Two stage Electric Heater

1.5.6 Up flow Plenum

A plenum of the same size as the unit can be selected for Upflow system. All plenums have

grilles at the outlet to streamline the air flow movement across the room. The plenum grills can

be regulated manually by changing the direction of airflow as per the site requirement.

Refer the Table 2. 3 for Plenum dimensions.

1.5.7 High efficiency Filter

The filtration efficiency level F5 (EN 799) and the average filtration efficiency of up to 90%

(ASHRAE52.1-1992) which restricts dust particles inside the cabinet.

1.5.8 Water leakage alarm

The water leak detector cable or point leak detector can provide input to the units or a third

party stand-alone monitoring system with an analog alarm signal to trigger a water leak

detection alarm of air conditioner unit and stop the water supply to the humidifier. The water

leakage alarm can accurately show the location of water leakage.


1.5.9 Smoke and fire detectors

The smoke detector can trigger the alarm system at once and turn off the unit when smoke is

detected. The fire detector can monitor the field return air temperature. Once it detects high

temperature, it will cut off the air return to the air conditioner unit at once. Both detectors are

indispensable to some data centers which cater to critical applications.

1.5.10 Supply Air Temperature Sensor

The unit needs to control supply air temperature when the data rooms have the racks arrange

in cold/hot aisle configuration. The sensor which is installed at the inlet of the fan for the down-

flow unit needs to be moved to the outlet of the fan.

1.5.11 Supply Air Pressure Sensor

Supply Air Pressure Sensor is used only for down-flow units. It detects the static pressure

under the floor of data room. The controller can adjust the fan speed according to the value

detected to get a constant desired static pressure reading.

1.5.12 Remote Sensor

The outlet of AC and the rack have a mere difference in the temperature. If the server inlet

temperature is to be controlled precisely, the remote temperature sensor which is mounted in

the cold aisle on the rack must be preferred.

1.5.13 Smoke sensor

Smoke sensor is installed in the unit return air side, for detecting smoke thereby, generating a

smoke detection alarm.

1.5.14 IS - Unity card

IS-UNITY Card can provide two kinds communication protocol: IS-485 and IS-WEB adopting

the communication and protocol of industry information department.

Figure 1-17 IS Unity Card


1.6 Working Conditions Refer the following tables 1.1 and 1.2 for the Storage Environment and Operating Environment.

1.6.1 Storage Environment

Table 1.1 Storage environment requirements

Item Requirement

General requirements Indoor, clean, no dust

Ambient humidity 5%RH to 85%RH (non-condensing)

Ambient temperature -20℃ to +54°C

Storage time Total transportation and storage time should not exceed six

months. Otherwise, the performance needs to be re-

calibrated

1.6.2 Operating Environment

The operating environment of the Liebert PEX+ meets the requirements of GB4798.3-2007.

Refer the Table 1.2 for details.

Table 1.2 Operating environment requirement

Item Requirement

Ambient temperature

Indoor 18°C ~ 32°C

Outdoor

Air-cooled: -35°C～+45°C (Low-temp kit is required when the temperature is below -15°C)

Protection level (indoor unit) IP20

Altitude <1000m. Above that, derating is required

Operation voltage range 380V (-10% ~ +15%), 3N~ 50Hz

When the unit is used in the following condition, Contact Vertiv Co.

• If the unit voltage exceeds the operating voltage range • Derating for altitude above 1000m • Other applications outside of applicable scopes


PART II

INSTALLATION


2. Installation The Installation process consists of the following procedures, namely -

• Pre-installation

• Installation Preparation

• Mechanical Installation

• Electrical Installation

2.1 Pre-installation Pre-installation contains the following 3 sub sections, namely -

• Transportation & Movement

• Unpacking

• Inspection

2.1.1 Transportation & Movement

When it comes to transporting the system, Railroad is a preferable choice. However, if railroad transportation is not possible, then the truck transport option is an optimal choice. One precaution is to choose roads that do not have too many bumps and if any, avoid it as much as possible.

• Liebert PEX+ systems are on the heavier side and therefore, it is recommended that equipment like an electric forklift is utilized for these heavy-duty systems.

• Move the equipment to a location which is in the vicinity of the installation site. • If an electric forklift is used, insert the tines of the forklift below the pallet as displayed

in Figure 2-1. Align the tines with the center of gravity to prevent the equipment from falling over. Figure 2-1 depicts the way the tines of the forklift are inserted below the pallet and in the same image, the graphic to the right indicates that the tines are aligned with the center of gravity to prevent the equipment from falling over:

Figure 2-1 Moving the equipment using a Forklift truck


When moving the indoor unit, keep the obliquity within the range from 75° to 105°, as shown in Figure 2-2

Figure 2-2 Obliquity of the system

2.1.2 Unpacking

Move the equipment to the place closest to the final installation site and then unpack it.

Follow the procedures below for unpacking:

Remove the side panels and top cover

Liebert PEX+ series air conditioner uses the international packaging. Use a hammer or straight screwdriver to straighten the connection hook that connects the side panels to the top cover, as shown in Figure 2-3.

Figure 2-3 Straightening the hook

At first, straighten all the hooks that fix side panel I, and remove side panel I. Then straighten all the hooks that fix side panel II, and remove side panel II. At last remove top cover III, as shown in Figure 2-4.


Figure 2-4 Removing side panels and top cover

2. Remove the base pallet

The unit is fixed onto the base pallet with M8×65 bolts or 8×90 screw, as shown in Figure 2-5. Use a 17mm open-end spanner, ratchet spanner or sleeve to remove the fixing bolts.

Figure 2-5 Fixing screw on the base pallet

2.1.3 Inspection

Check the system fittings and its components against the packing list to ensure that everything is in place and the assembly is intact.

If any parts or components are missing or damaged, immediately report to the carrier about the same. If hidden damages are observed, then contact the local offices of that carrier as well as Vertiv Co. at the earliest.


2.2 Installation Preparation (Site Preparation) The PEX+ series of air conditioners is streamlined for maintaining a favorable environment for

data centers, computer rooms, and similar ecosystems. Strict adherence to the installation

procedures is mandatory to ascertain proper installation of the air conditioner.

2.2.1 Equipment Room Requirement

Before installation, the equipment room must be prepared to ensure a smooth operation flow

and obtain accurate results. The equipment room must meet the standards for appropriate

ventilation and heating. The design specifications for the air conditioners must be ideal and

should match the energy-efficient design standards.

Following are the requirements for maintaining a favorable room environment prior to

installation:

The room should have suitable and effective heat insulation.

• The equipment room should have a sealed damp-proof layer. Polyethylene film should be used for the damp proof layer of the ceiling and walls. Alternatively, moisture-proof paint can be used to simulate the same effect akin to Polyethylene. Care should be taken that the coating on the concrete wall and floor must be damp-proof.

• Outdoor air increases the load of heating, cooling, humidification, and dehumidification significantly. Therefore, all the doors and windows must be closed. Gaps and seams must be highly narrow to prevent the outdoor air from entering the equipment room. It is an industry best practice to keep the infiltration of the outdoor air below 5% of the total indoor airflow. Take appropriate thermal insulation and antifreeze measures for outdoor water pipes to avoid poor drainage and insufficient water supply caused by freezing.

Vertiv Co. recommends that the site preparation is defined as per the

requirements. However, if these requirements are not met, Vertiv Co. recommends

that rectifications be made on the site so that it complies with the specified

requirements and conditions.

However, if the rectifications or modifications are not implemented, then Vertiv Co.

does not guarantee the accuracy and precision of the temperature and humidity

provided by the PEX+ model.


2.2.2 Installation Space requirements

Adequate installation space for the indoor unit must be provided. The indoor unit of the air-cooled product must be installed on the floor of an equipment room or computer room, and the condenser can be installed on the ground of outdoor or other room. The entire water cooled precision AC shall be installed on the floor of an equipment room or computer room.

• Do not use the indoor unit in the open and severe outdoor environment. • Avoid locating the indoor unit in concave or narrow areas, which can baffle the

airflow, shorten the cooling cycle and result in air return short circuit and air noise.

• Avoid locating multiple indoor units close to each other. That can result in crossing air patterns, unbalanced load and competitive operation.

• Do not install the unit in the vicinity of any precision equipment, and prevent the leaked condensation water due to improper use of the air conditioner from affecting the operation of precision equipment.

• Do not install other devices (such as smoke detector) over the cabinet.

2.2.3 Maintenance Space requirement

Make sure to reserve the maintenance space when installing the equipment. A maintenance space of 900mm must be allocated in front of the air conditioner unit normally. The requirement for maintenance space is given in Figure 2-6.

Figure 2-6 Maintenance Space


2.3 Installation Tools The following table 2.1 shows the generic tool sets and utilities used in the installation and maintenance process:

Table 2. 1

Name Drawing Name Drawing

Electric hand drill

Adjustable wrench

Slotted screwdriver

Cross head

screwdriver

Stepladder

Forklift

Drill

Wire cutting pliers

Claw hammer

Diagonal cutting pliers

Insulating shoes

Antistatic gloves

Electrician knife

Cable ties

Insulating tape

Insulating gloves

Crimping pliers

Heat shrinkable tube

Insulated torque

wrench Torque screwdriver

Multi-meter

Clip-on ammeter

The tools mentioned in the preceding table 2.1 are generic and commonplace; however, depending on various factors such as site environment, local rules and regulations, cables, installation equipment, and on-site electrical connections these tools may vary in a real- time scenario.

Ensure that the tools used in the installation, operation, and maintenance processes

are insulated.


2.4 System Arrangement during Installation The piping for the refrigerant is required for the indoor unit and outdoor unit of the air-cooled system. The system arrangement diagram of the refrigeration system is shown in Figure 2-7.

Scroll compressor Service valve

Suction pipeDischarge pipe

Ball valve

Thermal sensing bulb

Evaporator coil

Thermal expansion valve

Sight glassDry filter

Solenoid valve +

HP switchNeedle valve

LP sensor

Condenser coil

Check valveOil trap*

(mounted one for every rise of 7.5m)

distributor

Figure 2-7 System arrangement

• : Factory piping

• : Field piping (by technical personnel)

The following points should be considered before checking out the overall layout

diagram:

• The single system is used as an example to describe the entire system. • Vertiv Co. staff and qualified professionals lay out the piping.

• Components (marked with *) are not supplied by Vertiv Co. but are recommended for

proper circuit operation and maintenance.

• Additional components (marked with +) are required when the equivalent length exceeds

30m.


2.5 System Installation Mode The system installation schematic diagram explains the process of installation for the

Condenser:

Figure 2-8 Condenser is placed higher than the Compressors during installation

The condenser is installed higher than the compressor. Therefore, an inverted back bend is fitted to the discharge line and the liquid line of the condenser. The modification is essential as it helps prevent the liquid refrigerant from flowing back once the condenser stops. The top end of the inverted backbend must be installed higher than the ultimate level of the copper pipe of the condenser. However, if the condenser is installed lower than the compressor, then no modification is required.

Figure 2-9 depicts the schematic diagram of system installation when the condenser is installed at a lower level than the compressor.

Figure 2-9 The Condenser is placed lower than the Compressor during installation


2.6 Product Dimensions

2.6.1 Indoor Unit

The dimensions and weight of the indoor unit are displayed in Figure 2-10, Figure 2-11 and Table 2.2 respectively.

Figure 2-10 Outline drawings of the Upflow indoor unit (unit: mm)

Figure 2-11 Outline drawings of the Downflow indoor unit

Table 2. 2

Model Dimensions (W×D×H) (mm) Net weight (kg)

P1020U(D)A13C 853×874×1970 320

P1025U(D)A13C 853×874×1970 340

P1030U(D)A13C 1130×995×1975 400

P1035U(D)A13C 1130×995×1975 420

P1040U(D)A13C 1330×995×1975 460

P1040U(D)A13S 1330×995×1975 480

P1050U(D)A13C 1330×995×1975 530

P1050U(D)A13S 1330×995×1975 570

P2060U(D)A13S 1830×995×1975 690

P2070U(D)A13S 1830×995×1975 730

P2080U(D)A13S 2230×995×1975 770

P2090U(D)A13S 2230×995×1975 805

P2100U(D)A13S 2230×995×1975 810


2.6.2 Plenum dimensions (for Upflow unit)

For Upflow system, the plenums with grilles can be selected by requirements.

Figure 2-12 Plenum dimensions of P1020 and P1025 Upflow unit

Figure 2-13 Plenum dimensions of P1030~P1050 Upflow unit

Figure 2-14 Plenum dimensions of P2060～P2100 Upflow unit


The dimensions of plenum are depicted in Table 2.3

Table 2. 3

Model D (Depth) W (Width) H (Height) P1020 to P1025 857 863 400(600, optional) P1030 to P1035 995 1130 400(600, optional) P1040 to P1050 995 1330 400(600, optional) P2060 to P2070 995 1830 400(600, optional) P2080 to P2100 995 2230 400(600, optional)

If the height of the plenum selected for air conditioner unit exceeds 600mm,

consult Vertiv Co. professional for non-standard production.

2.7 Dimensions and weight of condenser Refer to the Condenser user manual for the Condenser dimensions and weight.

2.8 Positions and dimensions of air outlet

2.8.1 Base pallet cut-out location dimensions

The cutout position and dimensions are shown in the following figures:

140

45181

72

161

161

181

72

72

210 250

161

C/R

P

C/R

850

798

190

Figure 2-15 Top View of Cut-out location dimensions of P1020 and P1025 unit at the base (unit: mm)

Figure 2-16 Front View of 1130mm/1830mm unit cut-out location

70 120

49HD

69

320 C / RP

1130

70 120

49HD

69

320 C / RP

1830


Figure 2-17 Front View of 1330mm/2230mm unit cut-out location

P: Power cable entry D: Water drain hole

H: Water inlet for humidifier C/R: Condenser water inlet and outlet /refrigerant inlet and outlet

Cut-out location dimensions of at the base of P1030-P2100unit (unit: mm)

2.8.2 Position and dimensions of air outlet on top cover

The position and dimensions of air outlet on the top cover of Upflow unit are shown in figure 2-

18 and in Table 2.4 respectively.

Figure 2-18 Position of air outlet on top cover of Upflow unit

Table 2.4 Dimensions of air outlet on top cover of Upflow unit (unit: mm)

Model A B C

P1020 to P1025 720 795 800

P1030 to P1035 650 900 700

P1040 to P1050 850 900 900

P2060 to P2070 650 900 1400

P2080 to P2100 850 900 1800

HD

205

6369

320 C / RP

155

1330

HD320

205

C / RP

15569 63

2230


2.8.3 Side panel knock-out locations

If piping and wiring from the base are difficult, the connection from side panel can be selected.

The locations and dimensions of knock-out holes are shown in Figure 2-19 and 2-20

respectively. Select the inlet and outlet holes according to the actual needs. Ensure only one

service is used per opening.

Figure 2-19 P1020 and P1025 series knock-out

Figure 2-20 P1030-2100 series knock-out

Knock-out holes of side panel (unit: mm)

The equipment has knock-outs, be sure to mount sleeve to the cable holes to avoid

cutting the cables.


2.9 Indoor Unit Installation

2.9.1 Base Installation

The base must be made by the installation team according to the dimensions, weight, and

height of the unit to ensure the rigidness of the structure meets the requirement.

• For the downflow unit, the base height must be higher than 450mm. • The external side boards of the unit cannot bear weight. • The distance between the object that may block the air flow at the top of the

base and the outer edge of the EC fan shall be farther than 160mm.

Determine the installation position based on the installation space requirements mentioned in the section of 2.2.2, and fix the base onto the selected mounting position. The base shall be fixed to the ground through expansion bolts or spot welding, and the base shall be calibrated by horizontal ruler before it is fixed, so as to ensure the leveling top surface of the base. For downflow unit that requires the EC fan to be lowered, we must consider the spatial distance and the strength of the base in the design and installation of the base.

2.9.2 Vibration absorbing

Place a layer of rubber cushion on the top, lateral of the base and on the bottom of the steel

plate respectively in order to avoid transmission of vibration during operation of the unit, Refer

the table 2.5 for more details:

Table 2.5 Dimensions of rubber cushion for vibration absorbing (unit: mm)

Item Specification

Rubber cushion

Top Thickness: 3mm to 5mm

Lateral Thickness: 2mm to 3mm

Bottom Thickness: 10mm to 12mm

2.9.3 Unit Cabinet

The indoor unit cabinet should be installed on the horizontal base plane. The indoor unit and

the horizontal base does not require any welding or other fixed rigid connections.

2.10 Piping The pipes to be included in the Piping process are listed below:

• Condensed water drainage pipe of the indoor unit; • Water inlet pipe of the humidifier; • Connection of the copper pipe (discharge pipe and liquid pipe) between the indoor

unit and outdoor unit; • Pipe extension kit (optional)


The following points need to be taken into consideration during the Piping process:

• All the joints of the refrigerating pipes must be silver-brazed. • The selection, layout, and fixing of the pipes will conform to the industry

standards and norms. • Vacuum pumping and refrigerant charging operations, and procedures must

conform to the industry standards. • Pressure drop, compressor oil return, noise, and vibration must be considered

during the designing and installation process.

2.10.1 Connecting condensate drain pipe of indoor unit

The condensate of infrared humidifier and evaporator is joined by a cross connector and

drained through the drain pipe, as shown in Figure 2-21. The pipe OD is 25mm. If the drain pipe

is used by three or more units, the minimal pipe OD should be 40mm. For the unit that uses

electrode humidifier, the inner diameter of the drain pipe is 40mm.

When connecting the drain pipe, make sure that the U bend is installed vertically and the ‘U’ shape is not distorted, so as to ensure that the condensate can be drained immediately and effectively.

Because the infrared humidifier contains flowing hot water, the water pipe must be resistant to heat higher than 90°C. For the unit that uses electrode humidifier, the drain pipe of the condensate water must be able to withstand 120°C.

Figure 2-21 Connection of drain pipe of condensate water

2.10.2 Connecting water inlet pipe of humidifier

Requirements for connecting the water inlet pipe of infrared humidifier:

• To facilitate maintenance, an isolation valve should be fitted to the water inlet pipe.

• Make sure that the connection of the water inlet pipe is well sealed to prevent leakage. The infrared humidifier reserves a copper pipe (OD: 6.35mm), as shown in Figure 2-22. There is a 1/4” copper nut at the end of the copper pipe, and the 1/4” × 1/2” conversion copper thread connector has been connected to the copper nut to avoid losing them.


• Where the main pipe pressure may rise above 700kPa (The main pipe pressure

should be between 100kPa ~ 700kPa), a pressure reducer should be fitted.

• Where the main pipe pressure falls below 100kPa, a water tank and pump

system should be used.

• Some product may include components required by local codes

Figure 2-22 Water inlet pipe of infrared humidifier (Top: P1030&P1025. Bottom: P1030-P2100)

2.10.3 Connecting the pipes of electrode humidifier (for the unit that uses electrode humidifier)

Requirements for connecting water inlet pipe of electrode humidifier:

• Water inlet pipe uses 3/4” G screw-threaded connection pipe.

• Water filter and water quality detection are recommended to prevent the water quality from affecting the normal operation of the humidifier.

2.10.4 Connecting copper pipes (discharge pipe and liquid pipe) between indoor unit and condenser

• Select the size of connection pipes of the indoor unit. Considering the effect of the pipe diameter on the system pressure drop, the pipe diameter of the indoor unit and outdoor unit should be determined according to the specifications in table 2.6 or consult the technicians in local Vertiv Co. office.

• Connect the copper pipes in welding mode. The connection ball valves of the


discharge pipe and liquid pipe of the indoor unit are shown in Figure 2-23. Many notes and instruction labels are pasted onto the base and side panel close to the ball valve. Note that the ball valve must be wrapped with a wet cloth before welding to protect the label from burned during the welding operation.

• Connect the discharge pipe and liquid pipe of the indoor unit according to the instructions on the label.

• Horizontal sections of the discharge pipe should be sloped downward from the compressor, with a slope of at least 1:200 (5mm down for each 1m run). The discharge pipes should be insulated where they are routed in the conditioned space (including under a raised floor).

The exposure time of system pipes must not exceed 15min. Longer exposure will lead to the compressor refrigeration oil being affected by moisture, which can affect the life of the key components and the system operation stability.

Figure 2-23 Locations of discharge pipe and ball valve in liquid pipe


Table 2.6 Recommended pipe sizes

Recommended pipe sizes (unit: mm)

Model P1020

single system

P1025

single system

P1030

single system

P1035

single system

P1040

single system

P1040

dual system

Pipe

length D L D L D L D L D L D L

10m 22 13 22 13 22 16 22 16 22 16 22 13 20m 22 13 22 13 22 16 22 16 22 16 22 13 30m 22 13 22 13 25 16 25 16 25 19 22 13

40m* 22 16 22 16 25 19 25 19 25 19 22 16 50m* 22 16 22 16 25 19 28 19 28 19 22 16 60m* 22 16 22 16 25 19 28 19 28 19 22 16

Recommended pipe sizes (unit: mm) Model

P1050 dual system

P2060 dual system

P2070 dual system

P2080 dual system

P2090 dual system

P1050 single system & P2100 dual system

Pipe length

D L D L D L D L D L D L

10m 22 13 22 16 22 16 22 16 22 16 22 16 20m 22 13 22 16 22 16 22 16 22 16 25 16 30m 22 16 25 16 25 16 25 19 25 19 28 19 40m* 22 16 25 19 25 19 25 19 28 19 28 19 50m* 22 16 25 19 28 19 28 19 28 19 28 19 60m* 22 16 25 19 28 19 28 19 32 19 32 19

Note: • Extension kit should be added to the “Eq. Lgth” marked with *. • D: discharge line, L: liquid line. • Consult Vertiv Co. if the line length exceeds 60m.

• If the outdoor temperature of the unit is below-15°C, the low temperature kit must be used, and please consult Vertiv Co. for more details.


2.10.5 Pipe Extension Kit (Optional)

Conditions for selecting extension kit

If the one-way equivalent length exceeds 30m, or if the vertical distance between indoor unit and condenser exceeds the values in Table 2.8, consult Vertiv Co. before installation to confirm whether a pipe extension kit is needed. The pipe sizes recommended are ‘equivalent lengths’, with the resistance caused by bends taken into account. Refer table 2.7 for equivalent lengths of partial components, and the installer should confirm that the sizes are appropriate for the site conditions.

Table 2.7 Equivalent lengths of partial components

Outer Diameter (OD) of liquid pipe (inch)

Equivalent length (m) 90° bend 45° bend T type three-way

3/8 0.21 0.10 0.76 1/2 0.24 0.12 0.76 5/8 0.27 0.15 0.76 3/4 0.3 0.18 0.76 7/8 0.44 0.24 1.1

1-1/8 0.56 0.3 1.4

Table 2.8 Vertical distance between indoor unit and condenser

Relative position Altitude difference Condenser higher than indoor unit 20m Condenser lower than indoor unit 5m

A trap should be installed for every 7.5m of vertical distance. Consult a Vertiv Co.

service personnel for detailed information.

Installing pipe extension kit (optional, for site installation)

When the equivalent length of the one-way pipe exceeds 30m, the pipe extension kit should be installed. During the installation of the pipe extension kit, to avoid the pipe opening, it is recommended to install the solenoid valve of the pipe extension kit onto the outside project pipe of the ball valve on the liquid pipe. The outer side or the bottom of the unit is allowable. So, during installing the solenoid valve, do not cut the indoor unit pipes. After the whole system is installed, open the ball valve to keep pressure and carry out the vacuum operation, avoiding the moisture absorption of the compressor refrigeration oil and ensuring the operation safety and life of the compressor.


2.11 Lowering the Fan (For Down Flow Unit) Lowering of all EC fans of the downflow unit must be done before commissioning. The downflow unit has been equipped with a lowering tool when it is shipped. The lowering tool that uses winch is shown in Figure 2-24. It mainly includes hand winch, winch bracket, hook, sling, handle, and a L shaped lifting component.

Figure 2-24 Fan elevator assembly (winch mode)

Lowering procedure:

Install lift and lowering kit for fan: Open the unit maintenance cover, check the fixing bolts (Refer Figure 2-25, totally 2 PCS) of the L shaped lifting component to make sure that it is fixed properly, and then install the fixing bolts (totally 4 PCS) of the winch bracket, as shown in Figure 2-25;

Figure 2-25 Installing winch bracket

• Turn the handle and use the hook of the winch to hook the middle round hole (Refer Figure 2-25) of the L shaped lifting component. Adjust the handle until the sling is


completely tight. • Cut off the cable tie binding the fan cables to make the length of the cable satisfy fan

lowering requirements, and then remove the fixing bolts (Refer Figure 2-26, totally 4 pcs) for fan transportation.

Figure 2-26 Position of fixing bolt

• Hold the handle of the winch firmly, and then turn the handle counter-clockwise to lower the fan. After the fan is sunk, the status is shown in Figure 2-27;

Figure 2-27 Lowered fan

• Install the fixing bolts of the fan. • Remove the hook from the L shaped lifting component, turn the handle clockwise, tidy

the sling and remove the fixing bolts (Refer Figure 2-26, totally 4 PCS) of the winch bracket, and take out the winch and the bracket assembly.


• Remove the fixing bolts of the L shaped lifting component, and take out the L shaped lifting component.

At this point, the operation of lowering the fan of the one-bay unit is completed.

For the unit with two fans, lower the other fan too, using the fan elevator assembly. The

requirements are as follows:

• Repeat the above steps of the one-bay unit to lower the other fan. • After lowering all fans, tidy the fan cables and fix them using a cable tie.

Confirm if the EC fan has been lowered and installed, and ensure the blade will not touch the fan housing when the fan is rotating.

2.12 Removing Fastener and Vibration Absorber To protect partial components from damaging and distorting due to bumping, impact, and resonation in transportation, fasteners, and vibration absorbers are mounted at certain locations before delivery. Remove the fasteners and vibration absorbers before installation and commissioning.

2.12.1 Removing transportation fixing plate of compressor

To reduce the compressor operation vibration and noise, the vibration absorbing cushions are

added to the compressor base. However, such method cannot best restrain the vibration

during transportation and may result in loosened connections and wearing of certain parts. To

prevent this, three L shaped fixing plates are added to the three compressor bases during

transportation. After the installation and before the commissioning, remove the three L shaped

fixing plates before commissioning, and then restore the bolts and washers in the sequence

that is reverse to the disassembly process. The fastening torque of the bolts is (12±1) Nm.

Figure 2-28 Positions of L shaped fixing plates


2.12.2 Removing fastener of infrared humidifier

The floating pole of the humidifier high water-level switch is tightly bound together with a

rubber string before delivery, as shown in Figure 2-29. Remove the rubber string before the

unit operation. Otherwise, the unit cannot detect the high water-level alarm.

Do not touch the lamps with bare fingers.

Figure 2-29 Floating pole of high water-level switch

2.12.3 Removing pipe fasteners

To prevent the long copper pipes from scratching the metal plate and being damaged, the

pipes are cushioned with foam or bound up before delivery. Remove those materials before

power-on commissioning.


2.13 Installation Inspection Following are the points in the table that need to be verified and confirmed to ensure that the mechanical installation was implemented successfully:

Table 2.9 Installation Inspection

Items Results

Sufficient space is left around the unit for maintenance

The equipment is installed vertically and the installation fasteners have been fixed

The pipes between the indoor unit and outdoor unit have been connected, and the ball valves of the indoor unit and outdoor unit have been opened completely

The condensate pump (if needed) has been installed

The drain pipe has been connected

The water supply pipe for the infrared humidifier has been connected

All pipe joints have been made fixed

The transportation fasteners have been removed

Irrelevant things (such as transportation material, structure material, and tools) inside or around the equipment have been cleared after the equipment is installed

The air distribution system is installed as per room design

(for example, raised floor/grilles, ductwork, etc.)

The upflow unit must have plenum or have air supply pipe connection, and the fan and heater shall not be accessible after installation.


2.14 Electrical Installation In this section, the electrical installation of the PEX+ air cooled units is explained in-depth to help to get grips with the various tasks which include the installation notes, cable connections of the indoor unit and the checklist.

2.14.1 Installation Notes

• The connection of all power cables, control cables, and ground cables should comply with the local and national electrical regulations.

• The electrical installation and maintenance must be performed by authorized professional installation personnel.

• See the unit nameplate for the full load current. The cable sizes should meet the local wiring rules.

• Mains supply requirement: 380Vac (-10% to +15%), 50Hz, 3N~ • If the soft power cable uses Y-connection, and if the cable is damaged, it must be

replaced by professional service personnel. • Before the wiring, use a voltmeter to measure the power supply voltage and make sure

that the power supply has been switched off. • The applicable grid for this air conditioner: TN, TT star connection power system;

consult Vertiv Co. for other connections. • A breaking device must be provided to be disconnected from power supply.

2.14.2 Wiring of Indoor Unit

Locating Electrical Ports of Indoor Unit

The locations of the low voltage devices are visible after the front door of the

electrical control box of the indoor unit is opened, as shown in Figure 2-30. The

distribution information of the detailed low voltage components should be

differentiated according to the labels.

Figure 2-30 Electrical control box


Connecting Power Cable of Indoor Unit

The power connectors are located as shown in Figure 2-31. The enlarged view of

power connector is as shown in Figure 2-32, connect terminals L1 ~ L3, N, and PE

respectively to their counterparts of external power supply. Reserve some

redundancy of the incoming cable and fix the cable to the cable clamp located on the

inner side panel of the unit, Refer Figure 2-30. For the cable specification, Refer the

rated full load ampere (FLA) in the Table 2.10.

Figure 2-31

The cable sizes should meet the local wiring regulations.


Table 2.10 Rated full load ampere (FLA) (unit: A)

Model

Standard

model

With heating Without heating Standard

model with 2-

stage electric

heating

1-stage

electric

heating/ No

humidifying

2-stage

electric

heating/ No

humidifying

Humidifying

No

humidifying

P1020U(D)A13C 25.7 34.8 25.7 34.8 22.7 16.6

P1025U(D)A13C 30.9 40.0 30.9 40.0 27.9 21.8

P1030U(D)A13C 32.8 41.9 32.8 41.9 29.8 23.7

P1035U(D)A13C 35.7 44.8 35.7 44.8 32.7 26.6

P1040U(D)A13C 43.2 56.8 43.2 56.8 35.6 29.5

P1040U(D)A13S 42,4 56.0 42,4 56,0 34,8 28,7

P1050U(D)A13C 48.0 61.6 48.0 61.8 40.4 34.3

P1050U(D)A13S 51.0 64.6 51.0 64.6 43.4 37.3

P2060U(D)A13S 61.0 74.7 61.0 74.7 58.8 47.4

P2070U(D)A13S 64.0 77.7 64.0 77.7 61.8 50.4

P2080U(D)A13S 77.2 95.4 77.2 95.4 70.4 59.0

P2090U(D)A13S 82.2 100.4 82.2 100.4 75.4 64.0

P2100U(D)A13S 87.2 105.4 87.2 105.4 80.4 69.0 Note:

1. The standard model is configured with humidifier and 1-stage electric heating. 2. Air-cooled unit FLA excludes the condenser current. 3. MCB & cable sizes will be selected as per local electric norms.

Connecting Control Cables

The position of field connection terminals is shown in Figure 2-31, and the amplified figure is shown in Figure 2-32. The upper part of the terminal block is connected to the unit, while the lower part serves as user control signal interfaces.


Figure 2-32 Enlarged view of terminal block

Connecting water-under-floor sensor

Each unit is equipped with a water-under-floor sensor. Connect one end of the sensor to terminal 51# and the other end to the common terminal 24#.

The number of the sensors in parallel connection is not limited, but each unit has only one water-under-floor alarm.

Remote shutdown

As shown in Figure 2-32, 37# and 38# terminals can connect to remote shutdown switch, and they have been shorted in the factory and the shorting cable should be removed if the terminals are to be connected to the remote shutdown switch.

When 37# and 38# are opened, the unit will be shut down.

Customized alarm terminal

Terminals 50#, 51# and 55# can be connected to three kinds of sensors, and terminal 24# is their common terminal and can be defined as smoke sensor and water-under-floor sensor. After the customer terminals are connected with external alarm signals, the corresponding customized alarm should be set through the iCOM controller.

When the contact is open and no external alarm is generated, the input state of the customer terminal is open. But when the contact is closed and the external alarm is generated, the input state of the customer terminal will be shorted. At this point, the air conditioner system will generate an audible alarm, and the iCOM controller LCD will display the alarm information.


Terminals 50# and 24#: Smoke detector alarm switch.

Terminals 37# and 38#: Remote alarm

Terminals 51# and 24#: Water-under-floor sensor by factory setting

External general alarm

Terminals 75# and 76# can be connected to the external general alarms. The output signals to external alarm devices, such as alarm indicator. When critical alarm occurs, the contact will be closed to trigger remote alarms, send signals to the building management system or dial the paging system automatically. The power supply of the external general alarm system is user-prepared.

For the detailed definition of other terminals, refer to Appendix 1

Connecting Solenoid Valve of Pipe Extension Kit (Optional)

The solenoid valve of the pipe extension kit has two control cables used to connect with the

corresponding terminals of the control board. The solenoid valve cables of 1# system and 2#

system in dual system unit should be remarked separately to avoid wrong connection. For

specific wiring terminals in interface board, refer to the circuit diagram printed on the unit

label.

The controller uses the 24VAC solenoid valve port if other types of solenoid valves are used.

2.14.3 Wiring of Condenser

Connecting Control Signal Terminals

70#/71# and 70A#/71A# are control signal input terminals for two circuits of condensers and

their switching status is identical with those of the compressor.

Connecting Control Signal Cables

Open the sealed panel of the electric control box of the condenser to reveal the fan speed

controller board, according to the cable connection instructions in Liebert Condenser User

Manual. The signal cable connection of condenser is as follows:

Wiring of a condenser with single system used to match an indoor unit with single system

The digital signal of dry contact J6 on the board (Refer Cable terminals section in Liebert

PEX+ Condenser User Manual for the locations) is connected with the control terminals

70#/71# of the indoor unit.

Wiring of two condensers with single system used to match an indoor unit with dual system

The digital signals of dry contacts J6 on the condenser board corresponding to compressor

1# are connected with the control terminals 70#/71# of the indoor unit, and the digital signals

of dry contacts J6 on the condenser board corresponding to compressor 2# are connected


with the control terminals 70A#/71A# of the indoor unit.

Wiring of a condenser with dual system used to match an indoor unit with dual system

Short the terminals 70# & 70A# and 71# & 71A#. The digital signal of dry contact J6 on the

board can be connected with the control terminals 70#/71# or 70A#/71A#. For the detailed

connection, refer to Appendix 1 Circuit Diagram.

Connecting Power Cables of Condenser

The power cables of the outdoor unit are connected with the MCBs reserved in the condenser (Refer Figure 2-31).

2.14.4 Electrical Installation Inspection

After the electrical installation is completed, confirm the following points as given in the following Table 2.11.

Table 2.11 Installation Inspection

Items Results The power supply voltage meets the rated voltage on the unit nameplate

The system electric loop has no open circuit or short circuit

Power cables and ground cables to the MCBs, indoor unit and condenser are well connected

The ratings of the MCBs and fuses are correct

The control cables are well connected

All the cables connections are fastened, with no loose screws


PART III

SYSTEM OPERATION &

GENERAL MAINTENANCE


3. Controller Operation The Liebert iCOM offers the highest capabilities in unit control, communication and monitoring of Liebert mission-critical cooling units.

Liebert iCOM may be used to combine multiple cooling units into a team that operates as a single entity, enhancing the already high performance and efficiency of Liebert’s units.

Liebert iCOM is available as a factory-installed assembly or may be retrofitted on existing products. Large graphic display wall-mount versions of the control are available for remote operation and monitoring of cooling units.

3.1 iCOM Display Components & Functions The small and the large display have a common key layout, as shown in the Figure 3-1.

Figure 3-1 Liebert iCOM components

• The Help key may be pressed at any time for a brief explanation of what is being viewed.

• The risk of inadvertent system shutdown can cause loss of cooling and equipment damage.

• Press the On/Off key on a Liebert iCOM large display while the system screen is shown permits shutting down all units on the network.


Large Liebert iCOM displays can view and control other units on the network when they are in the same group. When turning a unit Off or On with the large display, make sure that the unit to be shut down or started up is shown on the screen. If the system screen is shown and the On/Off key is pressed, the Liebert iCOM shows a notification that pressing the On/Off key again will turn Off all units on the network.

Table 3.1 - Keyboard icons and functions

Icon Key Name Function

On/Off Key Begins Shutdown or Startup

Alarm Key Silences/Resets an alarm

Help Key Accesses integrated help menus

Escape Key Returns to the previous display view

Enter Key Confirms all selections and selects icons or text

Increase Key

(Up Arrow)

Moves upward in a menu or increases the value of a selected

parameter

Decrease

Key (Down

Arrow)

Moves downward in a menu or reduces the value of a selected

parameter

Left and

Right Arrow

Keys

Navigates through text and sections of the display

Upper LED

Blinking Red—Active, unacknowledged alarm exists

Solid Red—Active, acknowledged alarm exists

Lower LED

Amber—Power is available to the unit, unit is NOT operating

Green—Power is available to the unit, unit is operating


Lower LED Green and Amber LEDs will flash alternately when the unit is in

Standby

3.2 Control Interface - Large Display The Liebert iCOM automatically opens to the Unit View Status Menu when the cooling unit is started. This view will display Unit 1 in the upper right corner of the screen.

Figure 3-2 Unit view status menu

When no button on the Liebert iCOM control has been pressed for a short period, the display backlight turns Off. Pressing any key will reactivate the screen and display the status menu of the last cooling unit viewed.

The status menu will show the cooling unit’s operational mode, including information such as return air temperature and humidity readings, temperature and humidity setpoints and any active alarms. Symbols on the Liebert iCOM screens, shown in Figure 3-3, denote the operating modes.


Figure 3-3 Liebert iCOM default screen symbols

A Liebert iCOM will show only icons for functions available on the unit it is connected to. For instance, a Liebert iCOM on a cooling unit that does not perform humidification or dehumidification will not display icons for those functions.

Cooling systems may also disable functions temporarily for protective reasons. Icons for disabled functions will be displayed with a large X over them. The X will disappear when the function becomes available. A small Up or Down arrow will be shown next to the cooling and fan icon if either component is overridden by an internal safety routine.

The following Figure 3-4 refers to Navigation with a large display - single unit view


Figure 3-4 Navigation with a large display - single unit view


The following Table 3.2 refers to the User Menu icons:

Table 3.2

User Menus

User Menu password: 1490

Icon Name Description Available on Display

Setpoints View and change temperature and humidity setpoints

Small & Large

Spare Part List Displays the various part numbers of the components/parts in the cooling unit

Large

Event Log Contains last 400 events Small & Large

Graphics Displays temperature and humidity graphs

Small & Large

View Network Shows status of all connected units

Large

Set Alarms Allows enable, disable and settings for alarms

Small & Large

Sensor Data Shows readings of standard and optional sensors

Small & Large

Active Alarms Allows the user to view all current active alarms

Small & Large


Icon Name Description Available on Display

Display Setup Change settings for display: language, time, simple or graphic view

Small & Large

Total Run Hours Records the run time of all components and allows setting of limits on run time

Small & Large

Sleep Mode Allows setback settings for non-peak operation

Small & Large

Service Contact Info

Contains key contact information for local service, including names and phone numbers

Small & Large

Expansion Device Displays readings of Modbus devices

Large

Condenser Timer Displays the timer settings for the Liebert MC™ (microchannel condenser)

Large

3.3 Operation The Liebert iCOM display provides viewing, trending, and configuration capability for Liebert cooling units. All unit settings and parameters may be viewed and adjusted through three menus: User, Service, and Advanced. All active alarms are displayed on the LCD and annunciated.

The control is shipped from the factory with default selections for all necessary settings. Adjustments may be made if the defaults do not meet the desired requirements.

References to menu items in this manual are followed by the main menu and the menu where they can be found.

For example: • Temperature Setpoint (User > Setpoints) - The Temperature Setpoint parameter is at

User > Setpoints.

• High Return Humidity (Service > Set Alarms) - The High Return Humidity alarm is at

Service > Set Alarms.

3.3.1 Single Unit Functions

• ALARM OFF - The unit has an alarm that has forced the unit to turn Off.

• MANUAL- Unit is being controlled by a service technician using Service >

Diagnostics/Service > Manual Mode.

• DISPLAY OFF - When a unit is turned Off from the On/Off Key of a display, Display OFF

is shown for unit status.


• ALARM STANDBY - The unit has been rotated into standby because an active alarm

on the unit is present.

• STANDBY - The unit is on standby based on the Lead-Lag settings in Service.

• TIMER OFF - The unit has been set to Sleep and is waiting for the next start interval.

See User > Sleep Mode.

• UNIT ON - The unit is operating normally without alarm or warning.

• WARNING ON - The unit has an active warning but is still operating. See User > Active

Alarms for details.

• ALARM ON - The unit has an active alarm but is still operating. See User > Active

Alarms for details.

• TIMER - The unit is configured on a timer to only operate at certain times. See User >

Sleep Mode.

• REMOTE OFF - Remote shutdown terminals will turn Off the connected unit and the

front display shows REMOTE OFF as the status. This command is invoked when a

normally closed set of dry contacts opens. The remote On/Off and display On/Off

switches are in series. A cooling unit will start only if both switches are On. If one of

these switches is Off, the unit will stop.

• MONITORING OFF - In this case, an override to the monitoring is possible: Pressing the

display’s On/Off button will change the state to Unit Off; pressing again may start the

unit in Unit On. If the unit does not turn On, check the remote monitoring device or call

800-543-2778 for assistance.

• BACK-DRAFT - The unit is in a non-operational mode, but is operating the EC fan as a

backdraft damper

Pressing the On/Off key on a small display will affect only the cooling unit it is mounted on, regardless of whether the cooling unit is a stand-alone unit or part of a network. The small Liebert iCOM display does not have access to the Unit-to-Unit network.

Pressing the On/Off key on a large display of a stand-alone cooling unit will control only that unit.

The effect of pressing the On/Off key on a large display connected to a network depends on the view: System or Unit.

• In System view, pressing the On/Off key shows a warning asking for confirmation to

shut down the entire system.

• In Unit view, pressing the On/Off key affects only the unit being viewed, without a

confirmation request.

Each time a unit is powered On or Off, an event is added to the Event Log.

Depending on the operating state, start/stop priority switches may prevent the cooling unit from starting even though the cooling unit is turned On. All switches must be closed before the


cooling unit can operate. For example, if the cooling unit has been turned On through the Liebert iCOM, but the BMS remote monitoring system is sending a command to turn the unit Off, the cooling unit will remain Off.

The cooling unit’s operating status is displayed in the Liebert iCOM display. The operating status field may be used to determine an Off state based on the start-stop priority switches.

Remote On/Off Display On/Off Monitoring On/Off U2U Standby

If Remote On/Off is not used, a jumper is inserted to bypass the switch.

Autorestart

When input power returns after a power failure, the unit will return to its previous operating status: On if it was On before the power failure, Off if it was Off.

When power returns, the autorestart time—time-selectable: Single Unit Auto Restart (Service > Options Setup)—will determine how quickly the unit restarts.

Loss of Power Alarm

A Loss of Power Alarm is activated when power is restored after an interruption. If acknowledged, the alarm resets automatically after 30 minutes. This alarm may be set to different event types (Message, Alarm or Warning) and may be disabled under menu item Loss of Power (Service > Set Alarms).

Fan Alarm/Fan Protection Settings

The fan operation is protected by two digital devices: motor protection (optional on VFD centrifugal and constant volume centrifugal drives) and a differential pressure switch. The motor protection monitors for main fan overload or EC fan fault and the differential pressure switch detects a loss of airflow. If either protection device is activated after an adjustable time delay, an audible alarm occurs, an alarm relay activates and an event is recorded in the event log (Main Fan Overload or EC fan fault and Loss of Airflow in Service > Set Alarms).

The fan delay at the unit start is always five seconds shorter than the control delay (to avoid short-cycling components when the fan is not working).

When the main fan overload occurs, the main fan, cooling, heating, humidification, and dehumidification are disabled to prevent equipment damage; the unit status will show Alarm Off. The unit will automatically resume operation once the overload condition has cleared.

When an EC fan fault occurs, the unit will continue to operate normally unless a loss of airflow alarm occurs.

When a loss of airflow occurs, the fan(s) will continue to operate to keep the unit on the line until the problem is corrected. Cooling, heating, dehumidification, and humidification are disabled.

Figure 3-5 Start-stop priority switches


3.3.2 Setpoints

Setpoints allows the user to view, change and set the most important setpoints (temperature, humidity, etc.) in a central location.

U102 Temperature Setpoint - Selects a temperature that the cooling unit will maintain by applying cooling and or reheats. There are two values in this field. The Temp Set value is the temperature that has been set by the user to control the temperature. The Temp Act value is a read only value that indicates if another routine, like supply compensation has internally modified the Temp controlling value. If compensation has not been activated, then ACT and SET will always match. This parameter is adjustable from 41-104°F (5-40°C).

U103 Temperature Control Sensor - Selects the sensor that will control the cooling capacity. Unloading type compressors can be set to any sensor type, however fixed style compressors can only be set to Return or Remote control type l. The range should be Supply, Return or Remote Sensor. The factory default is Return.

U104 Humidity Setpoint - Selects a humidity that the cooling unit will maintain by removing or adding moisture to the air. The humidity setpoint will either be set in percent RH or as a Dew Point Value depending on what the humidity control type is set for. This parameter is adjustable from 20- 80%. The factory default is 50%.

U105 Humidity Control Sensor - Defines which humidity value the humidity setpoint is compared with. The return sensor is equipped with a Temp / Hum sensor and can calculate the dew point based on Liebert iCOM's internal lookup table. If a sensor other than the return sensor is selected, then iCOM will calculate the correct RH% based on the sensor selected and its actual temperature. The range is Remote or Return Sensor. The factory default is Return Sensor.


U106 Humidity Control Type - Selects the humidity control calculation. Setting this parameter to “Relative” will control the humidity without considering any temperature deviations. “Predictive” and “Absolute” control consider the temperature deviation from temperature setpoint so that a constant level of moisture is kept in the area based on the humidity sensor reading and the temperature deviation from setpoint.

Dew Point allows Liebert iCOM to calculate the actual dew point of the room and to control the humidity based on a user-entered dew point temperature. The range is Relative, Absolute, Predictive and Dew Point. The factory default is Predictive.

U107 Fan Setpoint - Needed anytime the fan operates from a different sensor than the temperature Setpoint.

U108 Fan Control Sensor - Determines the sensor which will control the speed of the fan. This parameter works in conjunction with the Fan Control Setpoint.

U110 Optimized Aisle Enabled - This read-only value indicates if the Liebert iCOM controller is setup in a Optimized Aisle configuration.

3.3.3 User-Graphic Menu Screens

Graphic screens allow the user to view temperature and humidity graphs. Nine flexible time scales with ranges up to 16 days are available.

There are two line trend graphs in Liebert iCOM. The upper graph displays temperature data and the lower graph displays humidity data. Each graph can be customized by changing the span of time and the range of the sensor readings. Each unit has its own temperature and humidity graphs as well as a system graph which displays an average of all connected sensors in the network of units.


3.3.4 Event Log

Event Log—The event log displays all events and actions generated by the unit. When multiple units are networked the event log shows results for the whole system. Each event shows the unit that generated the alarm, time and date stamp, a description and the event type. The event log contains the last 400 events generated by the unit. Events include such occurrences as unit On/Off commands, alarms, warnings and messages. The event log has two views: system view and unit view. When the event log is first entered, the system view is displayed. The system view lists events that have occurred at the unit and other units, if configured in a U2U network. Press the Right arrow when viewing the event log for the system view allowing the user to see unit-specific events. The unit name and number will appear in the upper right corner for the unit selected. Each event shows the unit that generated the alarm, time and date stamp, a description and the event type. As new events are stored in the log, older events are pushed further down the list. Once the event log reaches 400 events, the oldest events are erased as new events are stored.

3.3.5 View Network

The view network screen provides an overview of the Liebert iCOM network and a status of each unit. This screen will provide the unique unit name given to the unit. If no name is given, then only the unit number will be displayed.

3.3.6 User-Set Alarms Menu Screens

Set Alarms allow the user to view and modify basic temperature and humidity alarms and thresholds, example as below:

• High Return Temperature • Low Return Temperature • High Return Humidity • Low Return Humidity • High Supply Temperature • Low Supply Temperature

3.3.7 User- User-Sensor Data Menu Screens

Sensor Data shows the readings and status of standard and optional sensors.

Example as below: • Sensor A, B, C • Outdoor Temp / Hum • FC Fluid Temperature • CW Temp In / Out • CW Flow • CW Flow Circuit 1 • CW Temp C2 In / Out • CW Flow Circuit 2 • Total Cooling Load KW • Total Cooling Load KBtuH • Static Pressure inWC / Pa


• SYS Static Pressure inWC / Pa • Calculated Airflow CFM / m3h • Daily High Temperature • Daily Low Temperature • Daily High Humidity • Daily Low Humidity • Daily High Dew Point • Daily Low Dew point • Return THB T / H / DP • Sensor A T / H / DP • Remote / Auxiliary Sensors- Unit Information • Remote Sensor 1 - 10 • Remote Sensor Unit Average and Maximum • Unit Aggregated Ctrl Temperature • Teamwork Mode • Teamwork Aggregation Method • System Remote Sensor Average • System Remote Sensor Maximum • Aux Air Weight / Temp • Aux Air Mode / Temp • Analog Input 1 -4

* Note: Depends on unit model, not all readings and status are available.

3.3.8 User-Display Setup Menu Screen

Display Setup is where items such as date, time, screen type and temperature indication may be set according to user preference.

Example as below:

• Language • Date • Time • Temperature Indication - Selects the actual and set point temperature indication.

Selecting C will set the unit to display in Celsius and F will set the unit to display in Fahrenheit.

• Display Contrast - Changes the contrast of the display to adjust for different viewing angles, low light and bright light conditions.

• Buzzer Frequency - Changes the audible noise frequency of the built in buzzer. • Backlite Off After x Hours - ontrols the length of time that the back-light remains

active when the display is unused. When the buttons on the front display have not been pressed for the time selected in this parameter, the back-light will turn Off, extending the life of the display and saving energy.

• Screen - Determines the display mode: Graphical comma, Simple comma, Graphical and Simple

• Display Shows Data of Unit - Selects the layout of the main display. • Display Colors - Selects the background color. Inverted sets the display to show white

font with blue background; Normal sets a white background with blue font.


• System On/Off Enabled • Date Format • Show Variables Timeout • Additional Readouts - Selects whether fluid flow is displayed in the unit view. • Show Supply Temp @ Unit Off - Hides or shows the supply air temperature when the

unit is in monitoring Off, display Off, in remote shutdown or in standby mode. • Show U2U Numbers - Hides or shows the U2U number to the right of the unit name.

3.3.9 User-Total Run Hours Menu Screens

Total Run Hours displays the cumulative hours a particular component has been operating and the limit placed on the hours the component may operate. Each main component of the unit has its own run hours counter and a threshold. The actual run hours can be reset to 0 by selecting the counter by pressing Enter, and then pressing the Down arrow key. The thresholds can be set the same way.

3.3.10 User-Sleep Mode Menu Screens

The Sleep Mode menu contains parameters to set back or allow unit to turn Off during non-peak hours. Sleep Mode may be interrupted if the temperature rises above threshold set in the Set Alarms menu.

3.4 Event Types and Properties

3.4.1 Event Types

• Message: If this event occurs, it will only be entered into the event log

• Warning: If this event occurs, a warning will be generated and entered into the event log. The common alarm relay will be activated only if parameter Warning Activates Alarm Relay at Service > Alarm Setup is set to Yes. The factory default is Yes

• Alarm: When an alarm is received, a red light on the Liebert iCOM will blink and an alarm will sound, unless turned Off in User > Display Setup. Pressing the alarm button will acknowledge the alarm but not clear it. The alarm will not be cleared until the issue has been corrected, reset internally by the control or reset manually by the user. For instance, alarms such as High Pressure can be cleared by changing the alarm counter to 0. If this event occurs, an alarm will be generated and entered into the event log. An alarm does not necessarily switch Off the whole cooling unit; that depends on which alarm occurs. If a standby unit is set, any alarm will stop the faulty unit and start the standby unit. Standby activation functions only on alarms; messages or warnings will not start a standby unit. For more on standby units

Possible event settings are mentioned in the Table 3.3 (Some events are not available in

specific units)


Table 3.3

Event Internal Delay (Before Action Occurs)

Default Delay/Selectable (Before Action Occurs)

Type (Default)

MAIN FAN OVERLOAD 2 seconds 5 seconds/0 – 9999 * ALM

LOSS OF AIRFLOW 3 seconds 3 seconds/0 – 9999 * ALM

CLOGGED FILTERS 2 seconds 2 seconds/0 – 9999 * WRN

HIGH ROOM TEMP 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

LOW ROOM TEMP 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

HIGH ROOM HUM 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

LOW ROOM HUM 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

HIGH TEMP SENSOR A 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

LOW TEMP SENSOR A 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

HIGH HUM SENSOR A 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

LOW HUM SENSOR A 1 Min After Fan On 30 seconds/0 – 9999 Fixed to WRN

COMP 1 OVERLOAD Internal Calc. no ALM

COMP 2 OVERLOAD Internal Calc. no ALM

COMP 1 HIGH PRESSURE Internal Calc. no ALM

COMP 2 HIGH PRESSURE Internal Calc. no ALM

COMP 1 LOW PRESSURE Internal Calc. no ALM

COMP 2 LOW PRESSURE Internal Calc. no ALM

COMP 1 PUMPDOWN FAIL Internal Calc. no ALM

COMP 2 PUMPDOWN FAIL

Internal Calc. no ALM

DIG SCROLL1 HIGH TEMP Internal Calc. no ALM

DIG SCROLL2 HIGH TEMP Internal Calc. no ALM

EL HEAT HIGH TEMP 5 Sec 0 sec/0 – 9999 WRN

WORKING HRS EXCEEDED

0 Sec 0 sec/0 – 9999 Fixed to WRN

SMOKE DETECTED 2 Sec 2 sec/0 – 9999 * ALM

WATER UNDER FLOOR 2 Sec 2 sec/0 – 9999 * ALM

COND PUMP-HIGH WATER

2 Sec 2 sec/0 – 9999 * ALM

LOSS OF FLOW 5 Sec Reset Delay: 10 Sec

2 sec/0 – 9999 * ALM

STBY GLYCOL PUMP ON 2 Sec 2 sec/0 – 9999 * ALM

STANDBY UNIT ON 2 Sec 2 sec/0 – 9999 * ALM

HUMIDIFIER PROBLEM 2 Sec 2 sec/0 – 9999 * ALM

NO CONNECTION w/Unit1 Internal Calc. - WRN

UNIT X DISCONNECTED Internal Calc. - WRN

LOSS OF POWER 0 Sec No ALM

CUSTOMER INPUT 1 2 Sec 2 sec/0 – 9999 * ALM





Event Internal Delay (Before Action Occurs)

Default Delay/Selectable (Before Action Occurs)

Type (Default)

CALL SERVICE 2 Sec 2 sec/0 – 9999 * MSG

HIGH TEMPERATURE 2 Sec 2 sec/0 – 9999 * MSG

LOSS OF AIR BLOWER 1 2 Sec 2 sec/0 – 9999 * ALM

REHEAT LOCKOUT 2 Sec 2 sec/0 – 9999 * WRN

HUMIDIFIER LOCKOUT 2 Sec 2 sec/0 – 9999 * WRN

FC LOCKOUT 2 Sec 2 sec/0 – 9999 * WRN

COMPRESSOR(S) LOCKOUT

2 Sec 2 sec/0 – 9999 * WRN

COMP 1 SHORT CYCLE 0 Sec 0 - 9999 MSG

COMP 2 SHORT CYCLE 0 Sec 0 - 9999 MSG

No Power 0 0 seconds/0-9999 WRN

Condensate 1 Failure 0 5 seconds/0-9999 WRN

Condensate 2 Failure 0 5 seconds/0-9999 WRN

EC Fan Fault 0 10 seconds/0-9999 ALM

HIGH SUP TEMP 0 30 seconds/0-9999 WRN

LOW SUP TEMP 0 30 seconds/0-9999 ALM

REDUCED ECO AIRFLOW 0 3 seconds/0-9999 WRN

ECO HI TEMP OVERRIDE 0 10 seconds/0-9999 WRN

TEMP CTRL SENSOR FAIL 0 3 seconds/0-9999 ALM

HIGH DEW POINT 0 30 seconds/0-9999 WRN

LOW DEW POINT 0 30 seconds/0-9999 WRN

HI DEW POINT SENSOR A 0 30 seconds/0-9999 WRN

LOW DEW POINT SENSOR A

0 30 seconds/0-9999 WRN

HIGH REMOTE SENSOR 0 30 seconds/0-9999 WRN

POWER “A” FAILURE 0 10 seconds/0-9999 ALM

POWER “B” FAILURE 0 10 seconds/0-9999 ALM

AIRFLOW SENSOR FAILURE


HUM CTRL SENSOR FAIL 0 30 seconds/0-9999 WRN

LOSS OF FLOW 0 5 seconds/0-9999 ALM

STAT PRES SENSOR FAIL 0 120 seconds/0-9999 ALM

LOW STATIC PRESSURE 0 120 seconds/0-9999 WRN

HIGH STATIC PRESSURE 0 120 seconds/0-9999 WRN

STATPRES OUT OF RANGE


DAMPER FAILURE 0 10 seconds/0-9999 ALM

BMS DISCONNECTED 0 ENABLED/DIS - ENAB

WRN


The User inputs are mentioned in the Table 3.4.

Table 3.4

Setting Reaction Smoke Event Only Water Alarm Event Only C PMP Alarm Event Only Flow Alarm Event Only Stdby G Pmp Event Only Stdby Unit Event Only C-Input 1 Event Only C-Input 2 Event Only C-Input 3 Event Only C-Input 4 Event Only Rht Lockout Event + Electrical Heaters Disabled Hum Lockout Event + Humidifier Disabled Rht+Hum Lock Event + Electrical Heaters and Humidifier Disabled Comp Lockout Event + Compressor(s) Disabled w/o Pump Down Call Service Event Only High Temp Event Only Air Loss Event Only FC Lockout Event + Free-Cooling Disabled Heater Alarm Event + Heaters Off Flow AL SD Event + Shut Down the Unit Flow AL LC Event + Lockout Compressors, No Pump Down (enabled only if at least one

compressor is On; auto-reset depends on input status) Comp Lock PD Event + Compressor(s) Disabled w/ Pump Down Enable FC Forces Free-Cooling to On HTRJ VFD Activates the HEAT REJ VFD ALARM; no other function HTRJ SPD Activates the HEAT REJ SPD ALARM; no other function FIRE ALARM Event + Shuts the Unit Down 2ND SETPOINT No Event But Switches To The Second Setpoint Emergency Power Event + Disables Unit LSI Event + Activates Humidifier Problem Alarm and Stop Filling Bottle When Full COND 1 FAIL Event Only COND 2 FAIL Event Only D-SCROLL RED Event + Reduces the Requested Compressor Capacity by 20% SWAP VALVE No Event -Active X Valve Closes and Y Opens/Inactive Y Closes and X Opens; EC FAN FAULT Event + Sets Analog Output to 10V ECO AIRFLOW Event + Reduces Liebert Air Economizer Airflow DAMPERSWITCH Damper + End Switch POWER A Event Only POWER B Event Only


4 INTELLISLOT This chapter introduces the application of the host communication component INTELLISLOT, including the installation and commissioning of the host communication component and host communication networking diagram.

4.1 Introduction of IS Unity Card IS-UNITY Card can provide two kinds communication protocol: IS-485 and IS-WEB adopting the communication and protocol of industry information department.


4.2 Installing Host Communication Card

4.2.1 Installing communication card

The chilled water AC units are equipped with installation boxes 1 and 2. To install the host

communication configuration, insert the communication card into the installation box 1 and

tighten the screws as shown in Figure 4-2.



4.2.2 Connection

The electrical schematic figure of the host communication configuration is shown in Figure 4-3. P61, P65 and P66 cables are connected in factory. Therefore, only the communication card is to be connected the monitoring center.

Figure 4-3 Electrical schematic figure of host communication configuration

4.3 Commissioning of Host Communication Component Before commissioning, you must access the ‘SERVICE Menus’ of the iCOM control

board to set S824 MON ADD as ‘3’, S835 MON PORT as ‘Vlcty (Velocity)’ and S843

BL CTRL as ‘S+R’ in the “Network Setup”.

4.3.1 Assigning the Card’s IP Address

DHCP

The Liebert IntelliSlot Unity card is factory-configured for DHCP. If you require a Static or

BootP network configuration, be sure to change the Boot Mode as described in Static IP.

Connect an RJ-45 cable to the card and it will receive an IP address from the DHCP server.

Contact the DHCP administrator to obtain the IP address using the Liebert IntelliSlot Unity

card’s MAC address. The MAC address is printed on the card’s faceplate.


If the DHCP administrator is not available or there is no way of determining the IP address

assigned by the DHCP server, use a computer with a direct Ethernet connection to the Liebert

IntelliSlot Unity card, and the Autoconfiguration IPv4 Address convention described in 7.3.2

Connect an Ethernet Cable - Connect an Ethernet Cable to access the card’s Web page and

configure the card. To see the card’s last DHCP-assigned IP address, click on the Unity Tab,

then on the left side menu select Support > Active Networking. The table of information will

show the last IP address assigned by the DHCP server. The card may retain that IP address

when it reconnects to the DHCP network because most DHCP systems reuse the same IP

address for the same device.

Figure 4-4 IS-UNITY-DP card connection port

Figure 4-5 Example of IS-UNITY-DP card Web Page

Static IP

To assign a static IP address, use the Ethernet connection to configure the card.

4.3.2 Connect an Ethernet Cable

1. Connect a computer operating on Microsoft Windows operating system (Microsoft

Windows® XP with SP2 [64-bit] or SP3 [32-bit] or later) to the card by plugging a network


cable into the RJ-45 port on the computer and the Liebert IntelliSlot Unity card.

2. Autoconfiguration, which is normally enabled on computers running Microsoft Windows

operating systems, will automatically negotiate the communication settings. This takes

about one minute.

3. If the Ethernet adapter used to attach to the card does not show an Autoconfiguration

IPv4 Address, open a new Command Prompt and type ipconfig/renew and press Enter.

Hence, enabling the computer to acquire an Autoconfiguration IPv4 Address.

4. When the computer has an Autoconfiguration IPv4 Address, open a browser window on

the computer and type 169.254.24.7 (the card’s default Autoconfiguration IPv4 Address) in

the URL address field. The card’s Web page will appear.

4.3.3 Connect an RS-485 Serial Cable

Liebert IntelliSlot Unity cards come with an Adapter RJ-45-2POS Terminal Block. The adapter has two

screw terminals to attach the ends of a RS-485 cable for communicating to a building management

system.

Figure 4-6 Adapter RJ-45-2POS Terminal Block

1. Find the serial cable from the building management system. If it already has an RJ-45

connector on the end, determine whether it uses the same pinout as the Liebert IntelliSlot

Unity card’s connector. If the pinout is the same as the Liebert IntelliSlot Unity card

connector’s pinout, skip to Step 6.

2. Strip the ends of the positive (typically red) and negative (typically black) leads on the RS-

485 cable so that enough bare wire is exposed for connection, about 1/4" (6mm).

3. Position the adapter so the side with the positive and negative marks is face up. The small

markings are on the same side as the screw heads, as shown at right.

4. Loosen the screw to the positive terminal and insert the red wire far enough to insert the

bare wires into the terminal block under the screw, then tighten the screw.


5. Be careful not to break the wires.

6. Repeat Step 3 with the negative terminal and the black wire.

7. Plug the cable into the 485 RJ-45 port on the Liebert IntelliSlot Unity card.

4.4 Configure the Card The Liebert IntelliSlot Unity card requires minor configuration, such as choosing the IP/Web

communication interface, serial RS-485 communication interface, or both. The default for

IP/Web communication is IPv4, but this can be changed to IPv6 for greater security; contact

the nearest network administrator to determine whether it is compatible with your network. To

choose the communication interface refer to Figure 4-7:

1. Select Unity Tab > Configuration > Network Settings.

2. Enable the protocol, either IPv4 or IPv6, that will be used to communicate with the Liebert

IntelliSlot Unity card and with the Liebert equipment.

• Click on either IPv4 Settings or IPv6 Settings.

• Click the Edit button.

• When prompted with a login display, enter the user name and password (the defaults

are Liebert and Liebert).

• Put a check mark (✔) in the enabled box.

• Insert the desired or assigned IP address along with the rest of the required

networking information; contact your system administrator if necessary.

3. Click on Save to confirm the changes or click on Cancel to discard them. The changes will

take effect after the card is restarted.

Figure 4-7 Enabling the communication protocol—IPv4 or IPv6


The Liebert IntelliSlot Unity card will communicate with equipment and third-party systems

over these protocols:

• BACnet IP

• BACnet MSTP

• Modbus TCP

• Modbus RTU

• SNMP

• YDN23

• Only two of the protocols may be enabled on one card. • Only one version of BACnet may be selected, either BACnet IP or BACnet

MSTP. • Only one version of Modbus may be selected, either Modbus TCP or Modbus

RTU. • Only one of the protocols can use the 485 port; choosing two 485 protocols will

cause conflicts.

4.4.1 Enable Protocols

Protocols may be enabled after a card has been installed and configured. After a protocol is

enabled, it must be configured, which requires opening that protocol’s folder (Unity>Protocols>

(desired protocol).

To enable two communication protocols:

1. Select Unity Tab > Protocols.

2. Click on Edit and enter the administrator user name and password.

3. Put a check mark (✔) in the desired protocols—Only two may be enabled; Only one of the

two can use the 485 port.

4. Click Save to confirm the changes or click on Cancel to discard them.

5. Configure the protocols selected.

6. Restart the card.

• Select Unity Tab > Support.

• Enable the commands.

• Click on Restart.


Figure 4-8 Enable protocols, enable commands

Enable Modbus Protocol

Protocols may be enabled after a card has been installed and configured. To enable Modbus protocol:

1. Select Unity Tab > Protocols > Modbus.

2. Click on Edit and enter a User name and password.

3. Select the access level (Read Only or Read/Write).

4. Select the Modbus interface, (Modbus TCP or Modbus RTU).

5. Click Save to confirm the changes or click on Cancel to discard the changes.

6. Configure the Modbus interface chosen; refer to Configure Modbus TCP or Configure

Modbus RTU.

Configure Modbus TCP

1. Select the Unity Tab > Protocols > Modbus TCP.

2. Click on Edit and enter a User name and password if required.

3. Set the Limit Network Access Type by choosing from the drop-down list (Open/Same

Subnet/Trusted IP List).

4. Enter the port to be used by the Modbus Server to listen for and respond to Modbus

protocol requests based on limit Network Access Type setting.

5. Enter the Maximum Client Connection Count.


7. Restart the card to confirm the changes.





Configure Modbus RTU

1. Select the Unity Tab > Protocols > Modbus RTU.

2. Click on Edit and enter a user name and password if required.

3. Set the Node ID and the Baud Rate.

4. The Node ID defaults to 1, but must have a value from 1 to 255 that is unique among

devices connected through the RS-485 interface.

5. The default baud rate is 9600; 19200 and 38400 also available.

6. Contact your system administrator if you are uncertain about the settings.


8. Restart the card to confirm the changes.




Enable BACnet Protocol

Contact the system administrator or building management system administrator if

any ambiguity is faced about the settings.

1. Select Unity Tab > Protocols > BACnet.


3. Enter the Managed Device Write Access level (Read Only or Read/Write). This determines

a user’s ability to change settings in the Liebert IntelliSlot Unity card.

4. Choose the BACnet interface, either BACnet IP or BACnet MSTP

5. Set the Device Object Instance Number.

6. Set the Device Object Name.

7. Set the APDU Timeout.

8. Set the APDU Retries.


10. Configure the BACnet interface chosen; refer to Configure BACnet IP Protocol or

Configure BACnet MSTP Protocol.


Figure 4-9 BACnet protocol settings

Configure BACnet IP Protocol



1. Select Unity Tab > Protocols > BACnet IP.


3. Set the BACnetIP/Port Number

4. If the Liebert IntelliSlot Unity card is on a different subnet, a possibility when the monitored

units are part of a Liebert SiteScan network or other third-party monitoring service:

• Choose whether to enable Register as Foreign Device.

• Enter the IP address of the BBMD (BACnet Broadcast Management Device).

• Enter a time in seconds for Foreign Device Time-to-Live.


6. Restart the card to activate the changes.

• Select the Unity Tab > Support.




Figure 4-10 BACnet IP settings



1. Select Unity Tab > Protocols > BACnet MSTP.


3. Set the BACnet MSTP Node ID. The ID default is 1.

4. Set the BACnet MSTP Data Rate.

5. Set the BACnet MSTP Max Master Address.

6. Set the BACnet MSTP Max Info Frames. The default is 8.





• Click on Restart


Figure 4-11 BACnet MSTP settings

Enable SNMP

SNMPv1/v2c and SNMPv3 are enabled by default. The protocols may be configured or their default values may be accepted. Authentication Traps are not enabled by default. The default Heartbeat Trap interval is 24 hours; this can be disabled or the interval may be changed.

1. Select the Unity Tab > Protocols > SNMP.


3. To enable Authentication Traps, put a check mark (✔ ) in the box.

4. To change the Heartbeat Trap Interval, choose a time from the drop-down list or choose

Disabled to prevent any heartbeat traps from being sent.

5. The interval times offered are 5 minutes, 30 minutes, or 1, 4, 8, 12 or 24 hours.

6. Choose whether to disable the traps or to set the interval to one of the periods on the

menu.



• Select the Unity Tab > Support

• Enable the commands

• Click on Restart


5 System Maintenance & Troubleshooting The system operation and maintenance of the Liebert PEX+ series air conditioner is explained in brief from an end-user perspective. It includes information related to routine maintenance and inspection, inspection of electrical connections, wiring, system diagnosis, visual appearance checks, and drainage maintenance among others.

Prior to operation and maintenance, the lethal voltage may be present in the

equipment which can be fatal. All notes, warnings, and cautions marked on the

equipment as well as the ones mentioned in the manual must be considered,

otherwise, it may lead to injury and fatality.

Qualified and Professional Maintenance personnel are the ones supposed to operate and handle the equipment. Careful and cautionary measures are conveyed to the professional maintenance personnel and therefore, only those personnel’s may perform maintenance on these machines.


5.1 Monthly Routine Inspection Items The Table 7.1 displays the system components that need to be checked monthly for symptoms of wear and tear. The inspection also takes into consideration whether the components function correctly. (Table 5.1 shows the form used by service personnel who perform the inspection).

Date: Recorded by:

Model: SN:

Table 5.1

Components Inspection items Remarks

Filter Check if filter is clogged and damaged

Clean the filter

Fan Check if fan blades are distorted

Compressor No leakage

Check for noise and observe vibration condition

Air cooled condenser

Cleanliness of condenser fins

5Fan base is rigid.

Check if vibration absorbing cushion is aging or damaged

Check if SPD board (if any) is working, and check once a week in adverse climatic condition

Refrigerant pipes have suitable support

Cooling system

Check refrigerant pipes

Check the moisture condition in system through sight glass

Check HGBP valve (if HGBO system is equipped)

Check thermal expansion valve

Check water inlet/outlet temperature for unit with dual cooling sources or free cooling unit

Check if the condensed water pan is clogged

Heating system Check the operation of reheat system components Check eroding condition of components

Infrared humidifier

Check if water pan drainage is clogged

Check the lamp of humidifier

Check water pan for mineral deposits


5.2 Routine Biannual Inspection The table 5.2 displays the system components that need to be checked twice a year (half-yearly) for symptoms of wear and tear. The inspection also takes into consideration whether the components function correctly. (Table 5.2 shows the form used by service personnel who perform the inspection).

Date: Recorded by:

Model: SN:

Table 5.2

Components Inspection items Remarks Filter Check if filter is clogged and damaged

Clean the filter

Fan

Check if fan blades are distorted

Bearings in good condition

Check and fix connectors

Compressor

No leakage

Check for noise and observe vibration condition


Air cooled condenser

Cleanliness of condenser fins

Fan base is rigid

Check if vibration absorbing cushion is aging or damaged

Check if SPD board (if any) is working, and check once a week

in adverse climatic condition

Refrigerant pipes have suitable support


Water cooled condenser

Clean pipe system

Check the function of ball valve

Check if the water system leaks

Cooling system

Check the refrigerant pipes that must have support bracket

and should not be closed to wall, floor or fixed frames with

vibrations

Check the moisture condition in system through sight glass

Check HGBP valve

Check thermal expansion valve

Check if the system needs to be added with refrigerants

through sight glass

Heating system Check the operation of reheat system components


Infrared humidifier

Check if water pan drainage is clogged

Check the lamp of humidifier

Check water pan for mineral deposits


Electric control part Check and fix connectors


5.3 Self-diagnosis Function

The iCOM controller features a diagnostic function that enables the user to turn on/off the

components on site manually to check their functionality.

5.4 Electrical Connection Inspection

The inspection items include:

1. Conduct overall electrical insulation test: find out the unqualified contacts and handle them. Note to disconnect the fuses or MCBs of the control part during the test lest the high voltage should damage the control components.

2. Check the contactors before power-on and make sure the contactors can act freely without obstruction.

3. Clean the electric and control elements of dust with a brush or dry compressed air.

4. Check the closing of contactors for arcs or signs of burning. Replace the contactor if necessary.

5. Fasten all the electric connection terminals.

6. Check that the sockets and plugs are in good condition. Replace those loosened ones.

7. If the power cables are damaged, to avoid damage, the cables must be replaced by professional personnel.

5.5 Control Component Appearance Inspection Carry out visual inspection and simple function test by referring to the following items:

1. Visually inspect the power transformers and isolation transformers, and test the output voltage (of the indoor unit and outdoor condenser).

2. Check that there are no signs of aging on the control interface board, control board, temperature and humidity sensor board and fuse board.

3. Clean the electric control elements and control board of dust and dirt with a brush and electronic dust removing agent.

4. Check and fasten the I/O ports at the control interface board, including the connection between control board and control interface board, as well as between the temperature/humidity sensor board and the interface board.

5. Check the connection between the user terminals (70#, 71#, 70A#, 71A#, 37#, 38#) and the control interface board.

6. Check the output connection between the control interface board and various contactors and solenoid valves for liquid pipes, and the input connection between control interface board and fan overload protector, high pressure switch, heating over-temperature protection switch, humidifier protection switches, discharge air temperature sensor, and a low pressure sensor. In particular, check the connection parts such as high pressure switches and solenoid valves, and replace the component


if in poor connection or faulty.

7. Check and replace electrical components that are faulty, such as control fuses (or MCBs) and control boards.

8. Check the specification and aging condition of the control cable and power cable between the indoor unit and the condenser, and replace the cables when necessary.

9. Use temperature and humidity measuring meters with higher precision to measure and calibrate the temperature and humidity sensors.

Set the humidity control mode to ‘relative humidity control’ during the calibration process.

10. Adjust the setpoints. Check the action of the functional parts and the auto-flush control logic of water pan of the infrared humidifier according to the control logic.

11. Simulate and check the operation of the protection devices including high and low pressure alarm, high and low temperature alarm, high water level alarm and over-temperature protection.

12. Check the water detection sensor

Bridge the water detection sensor probes and confirm the alarm through the controller.

The sensor should be placed away from any water pool or drainage trench on the floor, 2m ~ 2.5m away from the unit. Do not place it directly under the unit. The recommended installation location of the water detection sensor is shown in Figure 5-1.

Figure 5-1 Recommended location for the water detection sensor

• Before fastening the connection of any mechanical parts or cables, make

sure that the power supply of the control unit has been disconnected.

• Do not use the water detection sensor adjacent to flammable liquid or use it

to detect flammable liquid.


5.6 Air Filter

The efficiency of the air filter in the unit is 30%, which complies with US ASHRAE52-76 and

Eurovent 4/5 standards, and the dust resistance value is 90%(EU4 standard). To ensure the

normal operation of the filter, the filter service alarm logic is provided by the controller. The

default fan running time is 2000 hours when the time is exceeded, the filter service alarm is

triggered. The user needs to replace the filter based on the clogging condition of the filter. The

filter must be checked once a month, and be replaced as required during operation.

• Cut the power before replacing the filter.

• Clear the fan running time to ‘0’ after replacing the filter.

5.7 Infrared Humidifier During the normal operation of the infrared humidifier, sediment such as mineral particles will

accumulate on its water pan. To ensure efficient operation of the infrared humidifier, the

sediment needs to be cleaned regularly. However, the cleansing cycle varies because the

water is different in different regions. It is recommended to check, and cleanse (when

necessary) the water pan, once a month. The auto flush function of the infrared humidifier can

prolong the cleaning cycle. However, regular checks and maintenance are necessary.

Cleaning steps:

1. Remove the water level standpipe to drain the water pan;

2. Disconnect the drainage pipe;

3. Remove the safety switch of the water pan;

4. Remove the fixing screws at the two ends of the pan, and pull out the water pan. Cleanse

the water pan with water and hard brush;

5. Restore the water pan by reversing the preceding procedures Before exercising the corresponding operation, make sure that the power has

been cut off; also, ensure that the water in the water pan is close to the room

temperature before draining the water from the infrared humidifier water pan to

avoid the personal injury.


5.8 Electric Heater

The Electrical heater contains three temperature switches that serially connect to the control loop. While two of the switches are automatically reset ones, the remaining one is a manual reset switch.

Figure 5-2 shows a schematic representation of the three switches inside an electric heater:

Figure 5-2 PTC electric reheat

The following steps need to be followed during inspection and maintenance of the Electric heater:

• Check the rust on the electric heater. Use an iron brush to get rid of the rust, if possible, or replace it if the rustiness is immense or if there is some damage.

• When heating is required, but heating is not effective or no heating effect is observed, a multimeter should be used to check whether the cable connected to the temperature switch is functioning correctly to ensure that the three temperature switches are normal.

• If the cable is not functioning properly, remove the electric heater and check if the manual reset switch is disconnected. Next, check the automatic reset switches or the electric heater pipe for damage or faulty condition.

38-1

DLT2

1050 DEARBORN DRIVE

P.O. BOX 29186

COLUMBUS, OHIO 43229

CAGE CODE

TITLE

DRAWING NO REV

55455

WIRING LEGEND

FACTORY SUPPLIED LINE VOLTAGE WIRING

FIELD SUPPLIED LINE VOLTAGE WIRING

FACTORY SUPPLIED 24 VOLT WIRING

FIELD SUPPLIED 24 VOLT WIRING

CONTROL BOARD INTERNAL WIRING - 24 VOLT MAX

WIRING AND DEVICES INCLUDED IN OPTIONS

ELECTRONIC SWITCH (TRIAC) Q1-Q18

INLINE QUICK DISCONNECT

OPEN CONTROL BOARD CONNECTION

PLUG CONNECTION ON CONTROL BOARD

PLUG CONNECTION ON FUSE BOARD

TERMINAL BLOCK CONNECTION ON CONTROL BOARD

TERMINAL STRIP CONNECTION FOR FIELD WIRING

CIRCUIT CONNECTION TO ELECTRONICS

TRIAC GATE CONNECTION

GROUND CURRENT DETECTOR CIRCUIT

OR

OR

BK

41-3

41-4 45-4

LINE

VOLTAGE3 PHASE

SUPPLY

SEE UNIT NAMEPLATE

FOR MAIN SUPPLYWIRE SIZING

GN/Y

EARTH GROUNDCONNECTION

L1 BK

L2

L3

BK

BK

INFRARED HUMIDIFIER

BK

1H1

2H1

3H1

1C1

2C1

3C1

L1

L2

L3

L1

L2

L3

COMPRESSOR NO.1

BL BR

BLBR

HTS

HWA

RSD3 RSD2 RSD137C 38C 37B 38B 37 38

REMOVE FOR EXTRA RSD TERMINALS SEE NOTE 6

Q6

Q5

R3K3K3

CPAR

LQR

38-3

40-2

40-4

40-6

40-7

PP

RAD1

RAD2

50

51

55

56

40-8

38-2

P

CPSS

24

HMV

FC

T6

T1

24V

SEE NOTE 6

BK

P

BK

SEE

NOTES

1 & 7

66-1

66-6

64-1

64-8

E1

E2

E3

E5

43-1

41-2 43-2

4-1

4-2

4-3

4-4

40-3

40-5

39-2

8-5

39-3

39-4 35-3

40-9

36-1

35-4

36-2

36-6

36-3

36-8

8-6

40-1

39-1

8-7

8-4

8-3

8-2

8-1

OR

22-5

22-2

22-4

52-4

52-1

52-2

52-3

53-1

54-1

52-5

53-4

54-4

RS1 RS2 RS3 BR

24DH 24DG

24H 24G

RH1

RH2DHV

H

BK36-5

36-7

34-3

34-1 34-2

35-5

51-4

34-7

34-5

34-9

36-4

34-4

34-6

34-8

35-1 35-2 35-6

35-7

51-1

51-2

51-3

51-5

HGBP2/DSV2

Q12

Q13 HGBP1/DSV1

Q14C1

32-1

33-1

32-2

33-2

32-4

32-9

32-8

11-1

11-3

11-2

11-4

32-6

Q15

Q8

Q9

LLSV2

Q10C2

36-9

32-3

33-4 33-5

32-5

33-9

33-8

11-5

11-7

11-6

11-8

32-7

33-3

1C2

2C2

3C2

L1

L2

L3

COMPRESSOR NO.2

REHEAT 1 2RH1

3RH1

1RH2

2RH2

3RH2

L1

L2

L3

1RH1

MAIN FAN 1,2L1

L2

L3

LLSV1

ELECTRICAL REHEAT

L1L2L3

( )

SEE NOTE 6

( )

24,24

15,18,20 12,23

19,23

55,57,58

52,53,54

34,35,36

10,33,36,46,

8,38,39,40,

41,42,62

12

45-3

42

41BK

R12-1

12-2

44

43BK

R12-5

12-6

GN/Y

K3

61-1

PRIMARY P65 CONNECTION

61-8

65-1

65-4

33-7

HP2LP2

33-6

HP1LP1

1BR

21CT

L1

L2

L3

BR

OPTIONAL REHEAT 2 RS4 RS5 RS6 SEE NOTE 6

54-2

54-3

53-5

54-5

OPTIONAL WITH GCD

24,39,40,41

CUSTOMER CONNECTIONS, ALSO SEE LINES 2,3,5,6,13,18,19,20,22,28 & 29

CONNECTS TO

MF1 ON 1 BAY UNITSMF2 ON 2 BAY UNITS

EARTH GROUND

CONNECTION

NEUTRAL

EARTH

SEENOTE

9

P

P

P

P

MFAS

P

P

2CPAR

BR

BR

BR

BR

3R3

2R3

1R3

P

P2LQR

COMMON

ALARMCONNECTION

REMOTELIQUITECT

INDICATOR

"OPTIONAL"

ALL FIELD WIRING - SEE NOTE 1

SEE

NOTE

8

65-1

65-2

OR

W/ORTO

MONITORINGSYSTEM

97

96

95

94

76

75

58

59

83

82

78

77

85

84

89

88

81

80

SEE

NOTE10

SEE

NOTE

7

EM1

R

R

C1

R

RC2

70

71

70A

71A

HEATREJECTION

DEVICE

CONNECTIONFTS

7-2

7-1

SDT

19

Q13 -

EC FAN

38

60

52

29

30

41

49

52

14

56

58

50

2

7

55

47

58

50

39

40

41

42

14

13

47

48

52

55

56

60

46

28

27

2

3

9

25

42

13

45

14

39

40

34

49

56

32

37

34

38

43

16

43

309

NOTES:

NOMENCLATURE

5

26

20

48

14

34

65

65

13

50

58

23

17

24

18

13

28

28

27

41

37

W

BR

BL

REMOVE WIRES WHENR3 IS PRESENT

22-1

22-3

22-6

Q18

Q17

1

3

W

BR

BL

2

3

2

T5

T2

T4

T3

GN/Y

HS3

15,61,62,63

15,20,61,62,63

1

53-2

53-3

BK

(EM1)

G4

G5

1

SW2

2

3

4

5

6

7

8

9

10

ONOFF

3BRR

3P RC1,2

OPTIONAL 3 PHASE REMOTE CONDENSER 1, 2

15,19,

61,62,63

WUF

DLT1

W

BR

BL

1

3

2

FOR 2 BAY & 3 BAY UNITSSEPERATE CB FOR REHEAT 2

FACTORY MOUNTED MAIN UNIT SWITCH

ALTERNATE P65 CONNECTIONSEE NOTE 12

3

2

BK

6

5

1SD

91

92

93

91

92

93G59024505

RESET

SDC

1

2

3

4

SDT

CP

W

R

R

BK

12345678

60

55

50

45

40

35

30

25

20

15

10

5 5

10

15

20

25

30

35

40

45

50

55

60

D

12345678

65 65

C

B

A

D

C

B

A

BR

2

3

1

BL

BR

W

OPTIONAL

GY

BK

W

GN

OPTIONAL

GY

BK

W

GN

BL

BR

SEE NOTE 16&19

SEE NOTE 16&19

BK

BK

BK

47,49,54

42,45

73

72SEE

NOTE

3 R

R

K11 24

2BR

K11

E4

A0029043251

1EM1

2EM1

HS1

HS1-3

HS1-2

HS1-4

HS1-1

HL3

HL1

HL2

HL3

HL1

HL2

HL2

41

Q

CCH1BK

4C1

5C1

BK

CCH2BK

4C2

5C2

BK

TO 24

TO 51

18

1525

26

L1

L2

L3

TO 38B

TO 37B

L1

L2

L3

U

V

W

36-6

36-1

BK RSA

RSB

21-2

21-3

20-1

20-2

14-2

14-1

SEE NOTE 17VSC1,2SEE NOTE 17

VARIABLE SPEED CONTROLER

17. TERMINALS ONLY FOR FACTORY SUPPLIED.

18. CONNECT THE WIRING TO THE VSC BOARD WHEN THE EC FAN NEED AN EXTE

-RNAL VSC, AND TO THE EC FAN DIRECTLY WHEN NO EXTERNAL VSC NEEDED.

BR

BK

BK

Ain

GND

E C F A N O P T I O N

/ E C 风机选配

(OPTIONAL)

-RNAL VSC, AND TO THE EC FAN DIRECTLY WHEN NO EXTERNAL VSC NEEDED.

19. CONNECT THE WIRING TO THE VS C BOARD WHEN THE EC FAN NEED AN EXTE

R

R13-5

13-6

R

R13-1

13-2

41

67-1

67-6

BR

BL SUPPLY

AIR

SENSOR

42

43

44

Ain

GND

(OPTIONAL)

VSC1

13-1 13-2

VSC2

13-1 13-2

ECF1 ECF2

(KL2) (KL2)

EC FAN OPTION

R

SEE NOTE 11

SEE NOTE 19

BK

BK

BK

BK

BK

BK BK

BK BK

BKBK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

R

R

R

R

R

R

BK

BK

BK

BK

BK

BKBK

BK BK

BK BK

BK BK

BK

BK

BK

BK

BKBK

BK

BK

BK

BK

BKBK

BKBK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BKBKBK

BK

BK

BKBK

BK

BK

BK BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BK

BKBK

E1/A in

GND

ECF1,2

21-1

21-2

21-1

21-2E C F A N O P T I O N

/ E C 风机选配

VSC1,2

VSC1,2

R R

BR

见注意事项 6

BR

BR1CPAR

BR1LQR

BK

MF R

GN

W

BK

GY

12-1

12-3

12-2

12-4

OPTIONAL

13-3 13-4

OPTIONAL

DIGITAL SCROLLTHERMISTOR 1

BK BK 13-5 13-6

OPTIONAL

DIGITAL SCROLLTHERMISTOR 2

BK BK

GN

W

BK

GY

12-5

12-7

12-6

12-8

OPTIONAL

PHASE FAULT RELAY

EIM1

43211 2EEVS2

EIM2

43211 2EEVS2

7C11S42

17C21S4

2

17C12 7C22

EEV1 EEV2(OPTIONAL)

60,54

65

EIM21 2

G2

G3

BK

BK

E1/A in

GND

ECF1,2

J32

EIM11 2

J32

FOR 30~100KW UNIT

20. CONNECT HS1 TO PLUG P35 FOR 20KW UNIT

；

CONNECT HS1 TO INFRARED HUMIDIFIER

HS1

SEE NOTE 20

SEE NOTE 20

Liebert® PEX+ Series Precision Air Conditioning · Various components such as compressors,...

Documents

Transcript of Liebert® PEX+ Series Precision Air Conditioning · Various components such as compressors,...