Product Training

48/50PD Series

Copyright © Carrier Corp. 2008

Agenda

1. Overview

2. Applications

3. New Components

4. Start-Up

5. Resources

Centurion 48/50PD OverviewWhat is it?

The Centurion 48/50PD product line is a 4 or 5 ton unit with a variable capacity digital scroll compressor and a variable speed indoor fan.

Product purpose?

• For use with either of the following two specific applications: Displacement Ventilation

Single-Zone Variable Air Volume

• Reduced kW consumption during part-load• Reduced Indoor Sound Levels• Higher Base Unit Efficiencies • Increased Operational $ Savings• Optimum Comfort Control• Ideal for School Market Applications• Thermal Displacement Application

Overview Details

Same chassis as Centurion 48/50PG units: same footprint and unit dimensions

Same roofcurbs as Centurion 48/50PG units

ComfortLink Controls standard in all 48/50PD units

All the same options & accessories as 48/50PG units except:

- No EnergyX ERV option- No Humidi-MiZer Adaptive Dehumidification option- Requires a space temp sensor; cannot use a thermostat

Single Refrigerant Circuit Machine

Centurion 48/50PD Overview

Variable Capacity Digital Scroll

15% - 100% of full load

Ton Range 1 2 3 4 5

5 ton

4 ton

48 / 50 PD

Range

Range

Variable Speed IFM Drivecan vary fan speed from 20% - 100%

Overview - How it Works

Applications• Displacement Ventilation (DV)

Specific specification per jobSpecific Duct and installation (new construction)Unique unit software configuration settingsDry climate regions

• Single Zone VAVStandard duct and installationNot approved for multiple zone controlNot applicable with 3V® Zoning

Displacement Ventilation Application

• Closely related to Underfloor Air Distribution systems, but with a rooftop unit and only for a single zone

• Air introduced at floor level at ~65F

• Spreads along floor level until it rises due to absorbing heat

• Return grill in ceiling

• Ideal for school classrooms

New Class Room - TestBenefits of Displacement Ventilation• Improved indoor air quality • Superior acoustic performance • Reduced cooling energy use (initial studies show as much as 35% less energy

usage compared to same size CV application) • Initial equipment costs comparable to conventional mixing distribution

systems with a significant reduction in operating (energy) costs

Displacement Ventilation Concept

Thermal Plume – Vertical airflow pattern near occupant and equipment

References:• 2008 ASHRAE HVAC Systems and Design Handbook, chapter 19• 2008 ASHRAE Journal May 2008 article “Underfloor for Schools”• Carrier White Paper “Displacement Ventilation Systems”

Single-Zone VAV ApplicationSingle-Zone Variable Air Volume

Single zone (no bypass, no mixing box, etc)

Variable airflow IFM operation – controlled by a space temp sensor

Variable capacity compressor – controlled by factory installed supply air temp sensor

Heating mode per conventional sequence of operation

A space temperature sensor is required; does not use a conventional thermostat, thus no multiple zoning.

Can also use a space humidity stat/sensor for dehumidificationWhen space humidity is above the setpoint, the unit will reduce the supply air setpoint until the high humidity condition clears. Fan speed continues to be controlled by the space temperature.

Single-Zone VAV Application Good applications for Single-Zone VAV include any situation where a constant volume unit would be used, but one or more of the following criteria are desired:

More consistent space conditioningWith the combination of the modulating compressor and variable speed indoor fan, the unit will be able to maintain a much more consistent space temperature and/or humidity level than a traditional CV unit which must cycle the compressor on/off.

Energy savingsWith the combination of the modulating compressor and variable speed indoor fan, the unit will use less power over the cooling season if applied correctly

Reduced indoor fan noiseWith the variable speed indoor fan, indoor airflow noise & fan start-up noise will be significantly reduced.

High Humidity ApplicationsWith the combination of the modulating compressor and variable speed indoor fan, when used with a space humidity sensor or humidistat, the unit will be able to maintain comfortable humidity conditions better than a conventional unit (without a Humidi-MiZer system).

New Components

Modulation Board – AUX1sends signal to modulate capacity and fan speed

Copeland Digital Scroll Controller – DSCoperates/modulates the compressor

Digital Scroll CompressorAllows variable capacity

Variable Frequency Drive – VFDoperates/modulates the indoor fan

New Component Layout

Modulation Board (AUX1)

FAN AUX BOARDPart number 32GB500442E

This is AUX1(the full feature board)Not the AUX2 – Depopulated

Outputs to the DSC and VFD

Allows LEN access for the ECB

J9J1

CH10CH9

J1 – 24vac

J9 – Duel LEN Communication

CH9 – 0-5vdc output – Commanded Compressor Capacity

CH10 – 0-10vdc output – Commanded Fan speed

LEN Address – 89 off off off on on off on off

Red and Green LED for diagnostics same as the MBB and ECB

Digital Scroll Controller (DSC)• Part Number – HK61EE001• Has direct control of compressor

contactor• Monitors discharge temperature

DTT- Discharge Temperature Thermistor (86k @ 25 degree C)

For compressor high temp protection• Cycles a solenoid (unloader) to

vary compressor capacity Similar to hot gas bypass

• Built in 2 minute anti-short delay after compressor shutdown

• Activates unloader for first 0.1sec compressor contactor is energized and last 0.5sec before shutdown

• Has 7 Alert codes displayed by LEDs for diagnostics

NO HIGH VOLTAGE PASSED THROUGH THE DSC… only low voltage

DSC – Alert Codes

DSC - Operation & Connections

INPUTS

24VAC/24COM

Digital Scroll Controller Power from MBB

T1/T2 Compressor Discharge Temperature(DTT - 86K ohm thermistor)

C1/C2 Compressor Capacity (1-5vdc signal)

L1/L2 Power for Compressor Contactor andUnloader contacts (L2 = 24vac, L1 =

common)

OUTPUTS

A1/A2 Scroll Compressor Alarm(input to MBB for alarm)

M1/M2 Compressor A Feedback to MBB and turn on compressor contactor

U1/U2 Digital Scroll Unloader control and feedback to MBB

MBB (ComfortLink) tells AUX1 what voltage to output to the DSC

1-5v scaled to 0-100% capacity0.04v per 1% starting with 1v. So 10%=1.4v

The DSC min allowed capacity is 11% = 1.44vComfortLink min capacity is 15% = 1.6v

For 0% capacity – CLINK outputs 1v

When CLINK outputs 1.6v or higherDSC closes M1/M2andpulses on/off the UC per input voltage

The pulse occurs within a 15 sec window

Copeland Digital Scroll Compressor• Compressor runs in 2 states

Loaded or Unloaded Both states within 15 sec

• Must maintain 75PSI Between Suction and discharge

• Must use Solenoid EF28XZ121, EF19XZ061

Modulation of Scroll CompressorLoaded State: Solenoid is De-energized = Compressor Capacity 100%

Unloaded State: Solenoid is Energized = Compressor Capacity 0% but still running

Capacity is an average % based on the time loaded (100%) vs time unloaded (0%) within one 15 sec window

0

2

4

6

8

10

12

14

16

Tim

e (

se

c)

0% 15% 30% 50% 75% 100%

Capacity

Time Unloaded vs Time Loaded determines the capacity

SecondsUnloaded

SecondsLoaded

Regardless of demand, CLINK soft starts compressor until required capacity is reached

1st 15 sec – output 15%

2nd 15 sec – output 35%

3rd 15 sec – output 55%

4th 15 sec – output 75%

After 1st min – 100%

VFD• Part Numbers

230v 3hp - HK30WA001460v 3hp - HK30WA008Motor (230/460v 2.4hp)– HD56FR651

• Motor Thermik is still first line defense• Only used to vary the supply fan RPM• No static or pressure reading used• Pre-programmed• No communication, No feedback• Must be in AUTO mode

VFDLow Voltage Wiring• 2-10vdc signal and jumpers• Analog Input Dip switch (AI1)

Must be set to off (towards “U” for vdc)Tells VFD to accept vdc or mA

• 2-10vdc signal form AUX1 wires to the AI1 and common to AGND

• The data cable connects the remote display to the base VFD

• Jumpers pre-installedBlue is common for discrete inputYellow (DI1) remote start/stopWhite (DI4) enable start

VFD• The MBB determines a fan speed

then tells the AUX1 board to output a voltage according The scale is 0-100% = 2-10vdc 2vdc = 0 commanded speed 1% = 0.08 vdc starting at 2v, so 10% = 2.8vdc

• ComfortLink is configurable for minimum & maximum speed. (FS.MN / SPEEDMIN & FS.MX / SPEEDMAX)

• Cooling mode is only mode where fan speed will vary between min and max

• Vent mode has a configurable speed (FS.VM / SPEEDVNT)

• Heat mode will always run the fan at configured max speed

VFD – High Voltage• VFD is powered by the indoor fan

contactor (IFC)• High voltage wiring per schematic

and VFD in Forward direction to allow fan to run in correct rotation

• VFD pre-programmed to accept 2-10vdc as 0-100% and varies the frequency (0-60Hz) according

VFD

3 Data Lines - These are pre-programmed but can be changed

• Percent Speed (%SP)This is the % the VFD is

currently running the fanRange 0-100%At steady state this will match

the ComfortLink Fan speed being displayed

• Current (A)Actual running amps of the fan

• Analog Input (Vdc)The input signal from

ComfortLink (AUX1 board)2-10Vdc

Red/Green Status LED

Operating Status and direction Must be AUTO and CW (forward)

Soft key Functions

HAND key

OFF key used to manually stop the fan

Soft keys

AUTO key HELP key

INCREASE/DECREASE or SCROLL UP/DOWN keys

Time of Day if enabled

Target Speed in frequency (0-60 Hz)

VFD Parameters

Start-Up• Follow same procedure as PG and other

RTUs

• Use service test for air balancingMax fan speed must still be above min air flow for

heating

• Specific applications require configuration changes. Table in start-up section of manual

Resources / Literature•PRB selection and performance data - PRB v1.18•Advanced Product Data manual - 48pd-01apd•Single-Zone VAV Application Tip - rooftop-08-12•Master Price Pages - 48pd-2ppg, 50pd-2ppg•Owners Manual - 48pdpg-01so•Copeland Application Bulletins - AE8-1328, AE21-1319•Displacement Ventilation white paper - Dec 08• Installation instructions - 48pd-01si, 50pd-01si•Controls & Operation manual - 48-50PD-01T

•ASHRAE article on DV - Must be an ASHRAE member to download.http://bookstore.ashrae.biz/journal/journalarticle.php?filename=52008megerson.pdf

•Displacement Ventilation Design Guide - CA Energy Commission http://www.archenergy.com/ieqk12/Public/Proj2_Deliverables/D2.9c_FinalDVDesignGuide_2006-0630.pdf

QUESTIONS ?