MECHANICAL EQUIPMENT FOR ICE ARANA – RFB #PUR0120 …

MECHANICAL EQUIPMENT FOR ICE ARANA – RFB #PUR0120-155 – CIP #555085

Innovative Engineers, Inc. Section 23 64 26-1

SECTION 23 64 26 – ROTARY-SCREW WATER CHILLERS

PART 1 - GENERAL

1.01 SCOPE

Provide microprocessor controlled, twin-screw compressor, water-cooled, liquid chillers of the scheduled capacities

as shown and indicated on the drawings, including but not limited to:

A. Chiller package

B. Charge of refrigerant and oil

C. Electrical power and control connections

D. Chilled liquid connections

E. Condenser liquid connections

F. Manufacturer start-up

1.02 QUALITY ASSURANCE

A. The unit shall be rated specifically for the unique requirements for chilling and maintaining proper

ice slab conditions for ice arenas.

B. Products must be designed, tested, rated and certified in accordance with, and installed in compliance with

applicable sections of the following standards and codes:

1. AHRI 550/590 – Water Chilling Packages Using the Vapor Compression Cycle

2. GB/T 18430.1 – water chilling (heat pump) packages using the vapor compression cycle - Part 1:

Water chilling (heat pump) packages for industrial, commercial and similar application

3. AHRI 575 – Method of Measuring Machinery Sound Within an Equipment Space

4. ANSI/ASHRAE 15 – Safety Code for Mechanical Refrigeration

5. ANSI/ASHRAE 34 – Number Designation and Safety Classification of Refrigerants

6. ASHRAE 90.1 – Energy Standard for Buildings Except Low-Rise Residential Build ings

7. ANSI/NFPA 70 – National Electrical Code (NEC)

8. GB150/151 – Steel Pressure Vessels/Tubular Heat Exchangers

9. Conform to Intertek Testing Services for construction of chillers and provide ETL/ cETL Listed

Mark

C. Factory Run Test: Chiller must be pressure-tested, evacuated and fully charged with refrigerant and oil, and

must be factory operational run tested with water flowing through the vessel.

D. Chiller manufacturer must have a factory trained and supported service organization.

E. Warranty: Manufacturer must warrant all equipment and material of its manufacture against defects in

workmanship and material. The warranty is for a period of 18 months from date of shipment or 12 months

from date of start-up, whichever occurs first. Compressor warranty shall be five (5) years parts and shall

include replacement labor.

rsj11575

Typewritten Text

ATTACHMENT E (revised)



1.03 DELIVERY AND HANDLING

A. Unit must be delivered to job site fully assembled with all interconnecting refrigerant piping and internal

wiring ready for field installation. Unit must be charged with refrigerant and oil by the manufacturer.

B. Provide protective covering over vulnerable components for unit protection during shipment. Fit nozzles

and open ends with cloth enclosures.

C. Unit must be stored and handled per manufacturer’s instructions.

PART 2 - PRODUCTS

2.01 GENERAL

A. Description: Furnish factory assembled, charged, and operational run tested water-cooled screw compressor

chiller as specified herein and shown on the drawings. Chiller must include, but is not limited to: semi

hermetic twin screw compressors, shell and tube hybrid falling film type evaporator, flooded condenser,

HFC-134a refrigerant, lubrication system, interconnecting wiring, safety and operating controls including

capacity controller, control center, motor starting components, and special features as specified herein or

required for safe, automatic operation.

B. Operating Characteristics:

1. Chiller is installed in an indoor location and must be capable of operating in room temperatures

between 40°F and 110°F (4.4°C and 43.3°C).

2. Provide capacity control system capable of reducing unit capacity to 20% of full load. Compressor

must start in unloaded condition. Application of factory installed hot gas bypass must be acceptable as

required to meet specified minimum load.

3. Chiller must be completely factory-packaged including evaporator, condenser, compressor, motor,

control center and all interconnecting unit piping and wiring. The complete chiller assembly must be

painted to meet 500 hour salt spray test in accordance with the ASTM B117 standard.

4. Shipping: Unit must ship in one piece and requires the installer to provide the evaporator and

condenser inlet and outlet pipe connections. If providing chiller model that ships in multiple pieces, bid

must include all the material and field labor costs for factory authorized personnel to connect the pieces, all

interconnecting piping, and wiring.

2.02 COMPRESSOR(S)

A. Compressor(s): Must be direct drive, semi hermetic, rotary twin-screw type, including: terminal box, and

precision machined cast iron housing. Design working pressure of entire compressor, suction to discharge,

must be 450 psig (31 barg) or higher. Com- pressor must be U.L. recognized.

B. Compressor Motors: Refrigerant suction-gas cooled accessible hermetic compressor motor, full suction

gas flow through 80 mesh screen, with inherent internal thermal protection and external current overload on

all three phases.

C. Balancing Requirements: All rotating parts must be statically balanced.

D. Lubrication System: External oil separators with no moving parts. GB listing must be provided on the

chiller. Refrigerant system differ-ential pressure must provide oil flow through service replaceable, 0.5

micron, full flow, cartridge type oil filter. Filter bypass, less restrictive media, or oil pump not acceptable.

E. Capacity Control: Compressors must start at minimum load. Provide microprocessor control to command

compressor capacity to balance compressor capacity with cooling load.



2.03 REFRIGERANT CIRCUIT COMPONENTS

A. Refrigerant: HFC-134a. Classified as Safety Group A1 according to ASHRAE 34.

B. Each refrigerant circuit must incorporate an electronic expansion valve controlled by the control center to

meter refrigerant flow to the evaporator to accommodate varying head and load conditions.

C. Equipment supplied must comply with LEED Energy & Atmosphere Credit 4, Enhanced Refrigerant

Management.

D. Each refrigerant circuit must incorporate all components necessary for the designed operation. Refrigerant

isolation valves must be provided to isolate the referent into the condenser for standard water chilling

application.

2.04 HEAT EXCHANGERS

A. Evaporator:

1. Evaporator must be shell and tube, hybrid falling film type with at least 2 pass arrangement to

optimize efficiency and refrigerant charge. Tubes are copper alloy high-efficiency, and are both externally

and internally enhanced to provide optimum performance. The “skip-fin” tube design provides a smooth

internal and external surface at each intermediate tube support. It provides extra wall thickness (up to twice

as thick) and non work-hardened copper at the support location, which extends the life of the heat exchangers.

Each tube is expanded into the tube sheets providing a leak-proof seal, and is individually replaceable.

2. Constructed and tested in accordance with applicable sections of GB pressure vessel code.

3. Waterboxes must be removable to permit tube cleaning and replacement. Liquid nozzle

connections must be 300 psig (20.6 barg HG raised-face welded flanges. Companion flanges, bolts, nuts,

and gaskets are not included. Flanges are field-welded by contractor.

B. Condenser:

1. Condenser must be shell and tube type, with a discharge gas baffle to prevent direct high velocity

impingement on the tubes and to distribute the refrigerant gas flow evenly over the tubes. An integral sub-

cooler must be located at the bottom of the condenser shell providing highly effective liquid refrigerant

subcooling and highest cycle efficiency. Tubes are copper alloy high-efficiency, and are both externally and

internally enhanced to provide optimum performance.

2. Constructed and tested in accordance with applicable sections of GB pressure vessel code for

minimum 235 psig (16.2 barg) refrigerant side design working pressure and 150 psig (10 barg) liquid side

design working pressure.

3. Waterboxes must be removable to permit tube cleaning and replacement. Liquid nozzle

connections must be HG raised-face welded flanges. Companion flanges, bolts, nuts, and gaskets are not

included.

2.05 INSULATION

A. Material: Closed-cell, flexible, UV protected, thermal insulation complying with ASTM C 534 Type 2

(Sheet) for preformed flexible elastomeric cellular thermal insulation in sheet and tubular form.

B. Thickness: 1 1/2 in. (38 mm)

C. Thermal conductivity: 0.26 (BTU/HR-Ft2-°F/in) maximum at 75°F mean temperature.

D. Factory-applied insulation over cold surfaces of liquid chiller components including evaporator shell,

suction line, liquid nozzles and waterbox.

E. Adhesive: As recommended by insulation manufacturer and applied to 100 percent of insulation contact



surface including all seams and joints.

2.06 ACOUSTICAL DATA

A. Provide unweighted sound power or sound pressure level data in decibels (dB) at the scheduled 8 octave

band center frequencies. A-weighted sound data alone is not acceptable.

B. Provide all sound power or sound pressure level data at 100%, 75%, 50%, and 25% load.

C. Supplied equipment must not exceed scheduled sound power or sound pressure level data at any load point.

The mechanical contractor must be responsible for any additional costs associated with equipment

deviation.

D. Acoustical performance must be evaluated in accordance with AHRI Standard - 575 test data.

2.07 POWER AND ELECTRICAL REQUIREMENTS

A. Power/Control Panel:

1. Factory installed and wired NEMA 1, powder painted steel cabinets with tool lockable, hinged,

latched, and gasket sealed outer doors equipped with door latch. Pro- vide main power connection(s),

compressor starters, current overloads, and factory wiring.

B. Single Point Power:

1. Provide single point power connection to chiller, must be 3 phase of scheduled voltage.

2. Single Point Circuit Breaker: A unit-mounted circuit breaker with external lockable handle must be

supplied to isolate power voltage for servicing. Incoming power wiring must comply with local codes.

Circuit breaker must be sized to provide chiller equipment with the branch circuit protection, short circuit

protection.

C. Control Transformer: Power panel must be supplied with a factory mounted and wired control transformer

that supplies all unit control voltage from the main unit power supply. Transformer must utilize scheduled

line voltage on the primary side and provide 115V/1Ø on secondary.

D. Motor Starters: Motor starters must be zero electrical inrush current (variable frequency drives) for

minimum electrical inrush. Open transition Wye-Delta and Across the Line type starters are not acceptable.

1. Provide equipment with power factor correction capacitors as required to maintain a displacement

power factor of 95% at all load conditions.

2. The installing contractor is responsible for additional cost to furnish and install power factor

correction capacitors if they are not factory mounted and wired.

E. All exposed power wiring must be routed through liquid-tight nonmetallic conduit.

F. Supplied equipment must not exceed scheduled minimum circuit ampacity (MCA). The mechanical

contractor must be responsible for any additional costs associated with equipment deviation.

2.08 CONTROLS

A. General:

1. Provide automatic control of chiller operation including compressor start/stop and load/unload,

anti-recycle timer, evaporator pump, condenser pump, unit alarm contacts and run signal contacts.

2. Chiller must automatically reset to normal chiller operation after power failure.

3. Unit operating software must be stored in nonvolatile memory. Field programmed set points must

be retained in lithium battery backed regulated time clock (RTC) memory for minimum 5 years.

4. Alarm controls must be provided to remote alert for any unit or system safety fault.



B. Display and Keypad:

1. Provide minimum 80 character liquid crystal display that is both viewable in direct sunlight and

has LED backlighting for nighttime viewing. Provide one keypad and display panel per chiller.

2. Display and keypad must be accessible without opening main control/electrical cabinet doors.

3. Display must provide a minimum of unit set points, status, electrical data, temperature data,

pressures, safety lockouts, and diagnostics without the use of a coded display.

4. Descriptions in English (or available language options), numeric data in English (or Metric) units.

5. Sealed keypad must include unit On/Off switch.

C. Programmable Set Points (within manufacturer limits): Display language, chilled liquid cooling mode,

local/remote control mode, display units mode, remote temperature reset, remote current limit, remote heat

recovery kit, leaving chilled liquid set point and range, maximum remote temperature reset.

D. Display Data: Chilled liquid leaving and entering temperatures; flow switch status; evaporator/condenser

pump status; active remote control; evaporator pressure, discharge, and oil pressures, condenser and

economizer pressures per refrigerant circuit; economizer temperature and superheat; subcooler liquid

temperature and superheat; compressor discharge temperature and superheat, motor; temperatures, eductor

temperature, per refrigerant circuit; compressor speed, condenser level, condenser level control valve;

economizer superheat; economizer feed valve percentage open; evaporator/condenser heater status; oil

pump status; compressor number of starts; run time; operating hours; history data for last ten shutdown

faults; history data for last 20 normal (non-fault) shutdowns.

E. Predictive Control Points: Unit controls must avoid safety shutdown when operating outside design

conditions by optimizing the chiller controls and cooling load output to stay online and avoid safety limits

being reached. The system must monitor the following parameters and maintain the maximum cooling

output possible without shutdown of the equipment: motor current, evaporator pressure, condenser pressure,

discharge pressure, starter internal ambient temperature, and starter baseplate temperature.

F. System Safeties: Must cause individual compressor systems to perform auto-reset shutdown if: high

discharge pressure or temperature, low evaporator pressure, low motor current, high/low differential oil

pressure, low discharge and economizer superheat, smart freeze point protection, high motor temperature,

system control voltage, eductor clog.

G. Unit Safeties: Must be automatic reset and cause compressors to shut down if: low leaving chilled liquid

temperature, under voltage, flow switch operation. Contractor must provide flow switch and wiring per

chiller manufacturer requirements.

H. Manufacturer must provide any controls not listed above, necessary for automatic chiller operation.

Mechanical contractor must provide field control wiring necessary to interface sensors to the chiller control

system.

2.10 ACCESSORIES AND OPTIONS

Some accessories and options supersede standard product features. All options are factory-mounted unless

otherwise noted.

A. Controls Options:

1. Building Automation System Interface: Chiller to accept 4 mA to 20 mA or 0 VDC to 10 VDC input

from BAS (by others) to reset the leaving chilled liquid temperature or load limit set point or both.

2. Gateway: Provides communication for BAS, including BACnet (MS/TP), Modbus, N2, and LON.

(Field commissioned by BAS manufacturer)

3. Ice making: Provide special control logic and modifications to produce leaving chilled brine

temperatures below 40°F (4.4°C.)



B. General Options:

1. Flow Switch: Vapor proof SPDT\ switch, 150 psig (10.3 barg), -20°F to 250°F (-28.9°C to

121.1°C.) (Field mounted by contractor.)

2. Differential Pressure Switch: 3 psig to 45 psig (0.2 barg to 3 barg) range with 1/4 in. NPTE

pressure connections. (Field mounted by contractor.)

a. Materials Package includes steel mill material reports for vessels in addition to Pressure Vessel

Report, Unit Run Test Report, Production System Check Sheet and Final Unit Inspection Check Sheet.

3. Vibration Isolation (All Options Field Mounted by Contractor):

a. Elastomeric isolators.

b. 1 in. deflection spring isolators: level adjustable, spring and cage type isolators for mounting

under the unit base rails.

PART 3 - PERFORMANCE

3.1 UNIT PERFORMANCE

A. All information is given on a per unit basis.

B. All bid equipment to meet or exceed existing equipment performance.

C. Chiller Unit #1:

1. Existing Chiller Unit to be replaced, Carrier Model 30HXC246R—630CA.

2. Refrigerant: R134a.

3. Evaporator brine solution: 21% Calcium Chloride.

4. Ice Loop Brine Flow Rate: 1200 gpm at 73 feet of head.

5. Ice Loop Discharge Temperature: 15°. Return Temperature 17°

6. Condenser water flow rate: 441 gpm at 5.9 feet of head.

7. Electrical: 460V, 3 phase, 60 Hz. MCA 303, MOCP 400, 350 A recommended fuse.

D. Chiller Unit #2:

1. Existing Chiller Unit to be replaced, Carrier Model 30HXC206R—630CA.

2. Refrigerant: R134a.

3. Evaporator brine solution: 21% Calcium Chloride.

4. Ice Loop Brine Flow Rate: 1000 gpm at 84 feet of head.

5. Ice Loop Discharge Temperature: 15°. Return Temperature 17°

6. Condenser water flow rate: 403 gpm at 7.5 feet of head.

7. Electrical: 460V, 3 phase, 60 Hz. MCA 263, MOCP 350, 300 A recommended fuse.

END OF SECTION



SECTION 23 65 00 - COOLING TOWERS

PART 1 - GENERAL

1.1 DESCRIPTION

A. Packaged, Factory assembled, open circuit, counter-flow, blow-through design cooling tower with single

side air entry. All steel construction shall be of G-235 hot-dip galvanized steel.

1.3 QUALITY ASSURANCE

A. Performance Criteria:

1. Manufacturer shall certify that performance of cooling towers will meet specified requirements, stating

entering air wet bulb temperature, entering and leaving condenser water temperatures, water flow rates,

fan kW (horsepower). Certification shall be made at the time of submittal.

1.4 SUBMITTALS

A. Provide product data to include rated capacities, dimensions, weights and point loadings, accessories,

required clearances, electrical requirements and wiring diagrams, and location and size of field

connections. Submit schematics indicating capacity controls.

B. Shop Drawings

1. Sufficient information, clearly presented, shall be included to determine compliance with

specifications.

2. Include rated capacities, pressure drop, fan performance and rating curves, dimensions, weights,

mounting details, front view, side view, equipment and device arrangement.

3. Include electrical rating, detail wiring for power, signals and controls.

C. Certification:

1. Submit four copies of performance curves, for CTI certified cooling towers, showing compliance with

actual conditions specified.

2. Certification by the manufacturer that the cooling towers conform to the requirements of the drawings

and specifications.

3. Provide one year warranty to include coverage for defects in material and workmanship. Fans,

fanshafts, bearings, sheaves, gearboxes, drive shafts, and couplings must be warranted against defects

in materials and workmanship for a period of five (5) years.

1.5 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are

referenced in the text by the basic designation only.

B. American National Standard Institute (ANSI/ASSE)

A10.18-2007 ....................................Safety Requirements for Temporary Floors, Holes, Wall Openings,

Stairways and Other Unprotected Edges in Construction and

Demolition Operations

C. American Society of Mechanical Engineers (ASME):



PTC 23-03 .......................................Performance Test Codes on Atmospheric Water Cooling Equipment

D. American Society for Testing Materials (ASTM):

A385-08 ...........................................Standard Practice for Providing High-Quality Zinc Coatings (Hot-Dip)

B117-07a .........................................Standard Practice for Operating Salt Spray (Fog) Apparatus

B209-07 ...........................................Standard Specification for Aluminum and Aluminum-Alloy Sheet and

Plate

E84-08a ...........................................Standard Test Method for Surface Burning Characteristics of Building

Materials

E. Cooling Technology Institute (CTI):

ATC-105-00 ....................................Acceptance Test Code for Water-Cooling Towers (CTI Code Tower

Standard Specifications)

ATC-105S-Rev. July 2004 ..............Acceptance Test Code for Closed Circuit Cooling Towers (CTI Code

Tower Standard Specifications)

201-02 (Rev. 04) .............................Standard for Certification of Water Cooling Tower Thermal

Performance (CTI Code Tower Standard Specifications)

F. National Electrical Manufacturers Association (NEMA):

MG 1-2006 Includes ........................Motors and Generators (ANSI)

250-03 .............................................Enclosures for Electrical Equipment (1000 Volts Maximum)

G. National Fire Protection Association (NFPA):

70-08 ...............................................National Electrical Code

PART 2 - PRODUCTS

2.1 FORCED DRAFT CLOSED CIRCUIT FLUID COOLER

A. Basis of design: Marley

Approved manufaturers:

1. Evapco

2. Baltimore Air Coil

2.2 FORCED DRAFT CLOSED CIRCUIT FLUID COOLER

A. Cooler shall be a factory assembled, forced draft, counter-flow type with a vertical discharge configuration.

B. Casing: Heavy gage (minimum 16 gage) Galvanized Steel

1. Galvanized Steel: Hot-dip galvanized steel complying with ASTM A653/A653M, and having G235

(Z700) coating.

2. Fasteners: Zinc or cadmium coated bolts or tapping screws for assembly. Use stainless steel washers

with neoprene backing where required for preventing leaks.

3. Joints and Seams: Sealed watertight.

4. Welded Connections: Continuous and watertight.



C. Framing: Rolled structural steel shapes, hot-dip galvanized after fabrication or structural shapes cold

formed from galvanized steel sheets or plates, complying with ASTM A653/A653M, and having G235

(Z700) coating.

D. Cold Water Collection Basin: Heavy gauge zinc-coated or hot-dip galvanized steel, same as the casing

E. Collection Basin Water Level Control: Mechanically operated bronze adjustable make-up water float valve.

F. Fans: Centrifugal double width, double inlet, forward curved blades, high efficiency and low noise belt

driven and statically and dynamically balanced at the factory after assembly. Hot-dip galvanized steel

centrifugal fans belt driven by single speed motor. The fan drive and moving parts shall be completely

enclosed by removable hot-dip galvanized screens and panels complying with OSHA regulations. Fan

shaft bearings of the self aligning, grease-lubricated ball or roller bearings with moisture proof seals and

premium, moisture-resistant grease suitable for temperatures between minus 29 and 149 degrees C (minus

20 and plus 300 degrees F). Bearings designed for an L-10 life of 50,000 hours and with extended

lubrication lines to an easily accessible location outside of the wet air stream. Provide access doors for

inspection and cleaning.

G. Motors and Drives:

1. The following shall apply:

a. Motors: Totally enclosed fan cooled (TEFC) or epoxy encapsulated NEMA premium efficiency.

Protect fan, bearings, and appurtenances from damage by weather, corrosion, water spray and grit.

Provide motors with severe duty rating with the rotor and stator protected with corrosion-

inhibiting epoxy resin, double shielded, vacuum-degassed bearings lubricated with premium

moisture-resistant grease suitable for temperatures between minus 29 and plus 149 degrees C

(minus 20 and plus 300 degrees F), and an internal heater automatically energized when motor is

de-energized. Provide an adjustable motor base or other suitable provision for adjusting belt

tension.

b. V-Belt Drive: Fan shall be driven by a one-piece, multi-groove, neoprene/polyester belt, where

this is the manufacturer’s standard. Belt drives shall be "V" type. Belt driven fan and motor shafts

shall have taper-lock sheaves fabricated from corrosion resistant material.

c. Lubrication fittings shall be readily accessible outside the wet air stream. Provide access doors for

inspection and cleaning.

H. Fill:

1. Polyvinyl chloride plastic with flame spread index of 25 or less when tested in accordance with ASTM

E84.

2. Fungal resistance: No growth when tested according to ASTM G21.

I. Drift Eliminators: Three-pass PVC, drift loss limited to 0.005 percent of total water circulated.



2.3 ACCESSORIES

A. Electric Immersion Heaters: In pan suitable to maintain temperature of water in pan at 40 degrees F when

outside temperature is 0 degrees F. Immersion thermostat and float control operate heaters on low

temperature when the pan is filled. Heaters to be constructed of copper.

B. Electric Temperature Controller: In pan, with sensor to cycle fans.

C. Time Delay Relay: Limits fan motor starts to not more than six per hour.

D. Provide electronic remote reset vibration switch with contact for BAS monitoring. The electronic vibration

cutout switch shall be set to trip at a point so as not to cause damage to the cooling tower. The trip point

will be set in a frequency range of 2 to 1000 Hertz and a trip point of 0.45 in/sec.

2.5 CONTROL PANEL

A. Provide factory furnished control panel for each fluid cooler.

B. Control panel shall be a field installed and wired NEMA 250 Type 3 – Drip-proof type enclosure,

containing:

1. Unfused disconnect switch.

2. Fan motor starters.

3. Interlocks and relays.

4. Pilot lights and push buttons.

5. Provide contacts for remote start/stop and for Building Automation System interface.




B. Cooling Tower Unit #1:

a. Existing Unit to be replaced, Baltimore Air Coil, Model VTL-152-M.

b. Water flow: 441 gpm

c. Temperature drop: 95° to 85° at 78° entering outdoor wet bulb temperature.

d. Fan motor: (1) 20 hp, 1800 rpm, 3 phase, 60 Hz, 230/460V, standard TEFC enclosure. Fan drives based

on 0” ESP.

C. Cooling Tower Unit #2:

a. Existing Unit to be replaced, Baltimore Air Coil, Model VTL-137-M.

b. Water flow: 403 gpm

c. Temperature drop: 95° to 85° at 78° entering outdoor wet bulb temperature.

d. Fan motor: (1) 20 hp, 1800 rpm, 3 phase, 60 Hz, 230/460V, standard TEFC enclosure. Fan drives based

on 0” ESP.

END OF SECTION


Innovative Engineers, Inc. 238400- 1 of 12

238400 - DESSICANT DEHUMIDIFICATION UNITS

PART 1: GENERAL

1.1 SUMMARY

A. This section includes factory designed, assembled, tested and packaged desiccant dehumidification

units

B. The unit shall be designed specifically for outdoor mounting and have a clean rectangular silhouette.

C. The unit shall be designed for steel dunnage mounting.

1.2 PERFORMANCE

A. The unit shall be designed specifically to meet the unique dehumidification and ventilation

requirements of this application.

B. Desiccant rotor shall be sized for full airflow capacity, without the necessity for bypass airstreams,

unless required by specific project requirements.

1.3 SUBMITTALS

A. Data to be provided:

1. Certified fan-performance curves with system operating conditions indicated.

2. Certified fan-sound power ratings

3. Certified coil-performance ratings with system operating conditions indicated.

4. Motor ratings, electrical characteristics, motor and fan accessories

5. Material gauges and finishes.

6. Filters and their performance characteristics

7. Dampers, including housings linkages, and operators

8. Control components.

9. Enthalpy rotor performance data with system operating conditions

10. Desiccant rotor performance data with system operating conditions

11. Include manufacturer detailing dimensions, required clearances, components, shipping splits, unit

weight, method of field assembly, and location and size of each field connection.

12. Utility requirements: natural gas, electrical, etc…

13. Airflow static pressure drops for each component.

14. Owner and contractor responsibilities list that details field installation requirements to

communicate activities that are to be field coordinated, provided, and supplied by others.

B. Submittal Data Availability:

1. All submittal data shall be available electronically. Plan and elevation views of the units shall be

in scale and shall be complete with internal scaled components.

1.4 QUALITY CONTROL

A. The unit assembly shall carry an ETL Label and be constructed in accordance to UL 1995 and ANSI

Z83.8. All features and options shall be included in the listing, including controls shipped loose.

B. Manufacturer’s Qualifications:

1. Manufacturer shall have a minimum of 10 years experience producing substantially similar

equipment, and shall be able to show evidence of at least 100 installations in satisfactory

operation for at least 5 years.



1.5 DELIVERY, STORAGE, AND HANDLING

A. Delivery of Units:

1. Deliver units to the Site to ensure uninterrupted progress of the work.

2. Comply with manufacturer’s recommendations for rigging of equipment.

B. Storage of Units:

1. Units that are stored in an outdoor environment prior to installation will require the Contractor to

provide protection from outdoor weather elements.

2. Store all units in such a manner as to permit easy access for unit inspection and/or identification.

Keep all units off the ground, using pallets, platforms, or other supports.

C. Acceptance at Site:

1. All boxes, crates and packages shall be inspected by Owner upon delivery to the Site. Owner

shall note any damage or missing components on the Bill of Lading from the carrier at time of

delivery. Owner shall also notify Manufacturer’s Representative in writing, if any damaged

equipment or lost components exist.

1.6 WARRANTY

A. Manufacturer to warrant desiccant dehumidification unit to be free of defects in material and

workmanship for 24 months from the date of factory shipment or 18 months from the date of start-up,

whichever is shorter. Manufacturer shall only be liable under this warranty if the product is installed

and used according to the directions furnished by the manufacturer.

PART 2: PRODUCTS

2.1 MANUFACTURERS

A. Basis of Design: CDI

B. Approved manufacturers:

1. Xetex

2. Innovent

3. Arid Ice

4. Seresco

5. Marcraft

6. Semco

2.3 UNIT CONSTRUCTION

A. 2.5” Case Wall

1. Base frame fabrication to utilize a single frame construction for supporting the casing and

internal components.

2. The casing walls and roof assemblies shall be constructed as a 2.5” thick wall. Wall design will

not use through-metal construction. The exterior and interior components shall be completely

independent of one another, free from thermal bridges or metal fastener connections of any kind,

and shall make up the insulated self-supporting casing.

3. All casing penetrations shall be provided with a thermal break between the exterior and interior

panels.

B. BASE FRAME CONSTRUCTION

1. Units to have an electrically welded structurally formed 12 gauge G-90 galvanized steel. All

frames to be suitably reinforced and braced to permit the loading, shipping, unloading and

rigging to the installation location. All frames are suitable for general handling of the completed

sections without damage or misalignment to the external and internal components.



2. Lifting lugs sets shall be provided on the base. Lifting lug distance shall not exceed a distance of

100” on center.

3. The floor assembly shall be 16 gauge and 20 gauge G-90 galvanized sheet steel for the top and

bottom of the floor deck, respectively. Urethane foam insulation 4” minimum nominal thickness

shall be used to insulate the base. Minimum 4" deep 12 gauge formed channels shall be used in

the floor for support. This floor shall sustain the equipment loading and normal maintenance

loading for the unit.

C. CASING CONSTRUCTION

1. Exterior wall panels shall be a minimum of 16 Gauge G-90 galvanized steel and shall be

fabricated into self-framing seam type construction. Interior wall panels shall be a minimum of

20 Gauge G-90 galvanized steel and shall be fabricated into self-framing seam type construction.

The exterior and interior panels combined, caulked and sealed, shall form a thermal barrier wall

casing capable of having no other additional structural supports required.

2. Exterior roof deck panels shall be a minimum of 16 Gauge G-90 galvanized steel and shall have a

minimum of 1 ½" standing seams. Each standing seam of the roof deck shall be securely

fastened at intervals not exceeding 12 inches, caulked and sealed. Interior roof liners shall be a

minimum of 20 Gauge G-90 galvanized steel and shall be designed to provide the roof structure

and support. The roof liner deck shall be securely fastened at intervals not exceeding 12 inches,

caulked and sealed.

3. All wall and roof assemblies shall be insulated with closed cell polyurethane expandable foam

insulation. The foam insulation shall have an R-Value not less than R-6 per inch, and shall

conform to DIN 4102.1 Class B2 flame spread and combustibility requirements. Minimum total

R-value for the casing and walls to be 15.

4. All joints shall be caulked airtight with a sealant that is 100% Pure RTV silicone; suitable for

temperatures in the range of -50°F to 450°F.

5. The exterior of the unit shall be made of G90 galvanized.

6. Closures around all components, such as coils, dampers and filters, shall be provided and made

airtight with silicone caulk. Closures shall be a minimum of 16 Gauge G-90 galvanized steel and

shall provide solid close-off inside of the unit housing walls.

7. Wall panels to use silicone caulk for sealing and adhesive properties. Gaskets shall not be used to

seal wall panels.

D. ACCESS DOOR CONSTRUCTION

1. All process air access doors shall have a no thru metal design including both the door frame and

main door panel assembly.

2. Access doors in the unit housing shall be provided to permit ready access to internal components.

The access doors shall be provided with an inner sheet of a minimum of 24 gauge, G-90

galvanized steel to protect the insulation. The exterior of the access doors shall be a minimum of

24 gauge galvanized steel. The doors shall be designed, to swing against the fan static (outward

on suction side, inward on discharge side).

3. The doors shall be provided with heavy-duty stainless steel hinges and heavy-duty keyed latches,

operable from both the exterior and interior of the unit.

4. Extruded aluminum thermally broken frames around the doors are to be used. A continuous

EPDM gasket is to be used on the access door frame for maximum air and water seal tightness.

Gasket is to be field replaceable.

5. When access panels are furnished in lieu of access doors, access panels shall be fabricated of 16

gauge, G-90 galvanized steel. One access panel shall be mechanically fastened to the exterior

casing and the other shall be mechanically fastened to the interior casing maintaining the thermal

break.



2.4 ENERGY RECOVERY SYSTEM

A. Energy recovery rotors shall be rotary air-to-air heat exchangers having efficiency as listed in

equipment schedules. The manufacturer shall submit performance data to demonstrate conformance to

the schedules regarding capacity and efficiency. Wheels shall have a flame-spread rating of 25 or less

and smoke-developed rating of 50 or less.

B. Energy Recovery Rotor

1. Total Energy Recovery Type shall be comprised of aluminum coated with 4A Molecular Sieve,

non-migrating, water selective desiccant. Aluminum base material shall be a minimum of 70

microns (0.0027”) thick of type 5052 hardened aluminum alloy. Including coating, material shall

not be less than 14 LBS/FT3 and media wall thickness shall not be less than 0.005”.

2. Media shall be corrugated with a flute height of 1.5 mm (0.091”) and flute width of 3.0 mm

(0.118”), allowing for passage of 800 micron particles, and shall be rated to withstand intermittent

exposure to 250 FDB without loss of performance or reduction in structural integrity.

3. Media may be cleaned with mild detergent, water, compressed air, or low pressure steam (< 15

PSI). Rated lifetime shall not be less than 87,600 hours, and shall be defined by media

performance < 90% of original capacity. Rotor performance shall be independently tested in

accordance with applicable ASHRAE guidelines (Method of Test 84-91), and rated in accordance

with ARI Rating Method 1060.

4. Flame resistance and smoke produced indices must also be independently tested in accordance

with ASTM E-84 with results of less than 25/50.

C. Energy Recovery Rotor Cassette

1. Seals: Supply and exhaust air stream shall be isolated from each other by means of adjustable

seals secured to the cassettes panels and duct dividers. Seals shall consist of a double layer of

neoprene wiper seals, labyrinth or brush seals. Wiper and bush seals shall be installed in contact

with the wheel flange in order to minimize leakage between the supply air and exhaust air system.

Labyrinth seals shall be installed with a minimum gap between the seal and the wheel flange.

D. Energy Recovery Rotor Drive System

1. Wheel Support and Drive: The wheel shall be supported by ball bearings and driven by a belt

around the outside of the wheel. The drive motor shall be appropriately sized to ensure operation.

The gear-motor shall be factory mounted.

2.5 EXHAUST FANS AND MOTORS

A. Belt drive blowers shall be a minimum of Class 1, double inlet forward curved fans. The wheels shall

be supported by two outboard bearings which shall be of a self-aligning, single row, deep groove ball

type with eccentric locking ring, and shall be designed for at least 200,000 hours average life.

B. Blower shafts shall be solid ground and polished. The shafts shall not pass through their first critical

speed when the unit comes up to the rated RPM. Shaft shall be coated with a rust inhibitor.

C. All V-belt drives shall be standard capacity, furnished in matched sets with reinforced rubber belts.

The sheaves shall be of a cast iron type and shall be complete with companion type driver sheave on

drives with three belts or more. All drives shall be complete with a split taper bushing.

D. The service factor of the drive set shall be not less than 1.25.

E. An adjustable motor base shall provide variation in center distance and shall be readily adjustable by

means of screw adjustments. A locking nut, or similar device, shall be provided to secure the base in

proper position.



2.6 BELT DRIVEN FAN MOTORS

A. All belt driven fan motors shall be premium efficiency open drip-proof (ODP).

2.7 SHIPPING SPLITS (OPTIONAL)

A. Shipping splits, are constructed of 12 gauge G-90 galvanized steel in a mating angle design on unit

interior walls, roofs, and base. Unit sections shall be fastened together with 3/8 inch bolts 18" on

centers. All fasteners caulk, and gaskets required shall be supplied and shipped with unit in a separate

box.

2.8 OUTSIDE AIR INLET HOODS

A. Outside air source shall be furnished with either multiple or a single hood and bird screen which shall

be sized for no more than 500 fpm of the 100% of the system outside air volume of the adjacent

opening through unit casing.

B. Hoods and bird screen shall be manufactured of a minimum of 16 gauge, G-90 galvanized steel.

“Chicken wire” is not acceptable.

2.9 DAMPERS

A. Damper frames and blades primarily shall be 16 gauge galvanized steel with plated steel linkages and

shafts to ensure a long corrosion free life.

B. The blades shall be a minimum of 16 gauge galvanized steel with a maximum single blade dimension

of 7" x 48". Blades shall be of rigid design with minimal twisting, flexing or vibration at the design

velocities.

C. Blade-to-blade linkage is concealed in the frame and out of the airstream to protect linkage as well as

reduce pressure drop and noise. Linkage is engineered to accurately control each and every blade

without need for adjustment.

D. Axles are 1/2 in. diameter square plated steel positively locked to the blades to eliminate slippage

between blades and axles. Stainless steel bearings rotate in a polished extruded frame raceway.

E. Dampers shall have extruded vinyl blade seals and “arc” jamb seals which shall be flexible stainless

steel compression type. Leakage shall not exceed 10 CFM at 4” W.C. differential pressure.

F. Damper to be provided with motorized actuator.

2.10 PRE-FILTERS

A. Air filters shall be medium efficiency ASHRAE pleated panels consisting of cotton and synthetic

media blend, media support grid, and enclosing frame.

B. Construction

1. Filter media shall be a cotton and synthetic blend, lofted to a uniform depth, and formed into a

uniform radial pleats. There shall be at least 10 pleats per linear foot for 2” thick filters.

2. A welded wire grid, spot-welded on centers and treated for corrosion resistance, shall be bonded

to the downstream side of the media to maintain the radial pleat and prevent media oscillation.

C. Performance

1. The filter shall have a Minimum Efficiency Reporting Value of MERV 13 when evaluated under

the guidelines of ASHRAE Standard 52.2.2007.

2. Initial resistance to 500 fpm airflow shall not exceed 0.28” W.C. for a 2” filter.

3. The filter shall be classified by Underwriters Laboratories as UL Class 2.

4. Manufacturer shall provide evidence of facility certification to ISO 9001:2000 or higher.



D. Filters shall be held in galvanized steel holding frames equipped with gaskets. Filter frames shall be a

minimum of 16 gauge G-90 galvanized steel.

2.11 DX COOLING COILS

A. Coils shall be of face area, rows and materials as indicated on the schedule.

B. The steam heating coils shall be constructed of 0.020” 5/8” seamless copper tube mechanically

expanded into die formed full height collars in the fins. Fins are to be 0.0075” thick aluminum.

C. The casing and tube sheets shall be a minimum of 16 gauge galvanized steel.

D. Coil tubes shall be pitched to promote drainage.

E. The coils shall have no more than 10 fins per inch.

F. Copper Tube Coils are standard and shall be tested under water at a minimum of 315 PSIG.

G. The maximum face velocity of the air passing over the coil shall not exceed 500 feet per minute if wet

and 550 feet per minute if considered a dry coil.

H. The cooling coil drain pans shall extend beyond the coil headers and return bends. The depth of the

drain pans shall be at least 1 1/2 inches and shall pitch toward the side of the unit. Drain pans shall be

a minimum of 16 gauge 304 stainless steel and shall extend beyond the coil depth in the downstream

direction of the airflow a minimum of 1/2 the fin height of the coil. An intermediate condensate drip

pan shall be provided on all multiple height coils over 48” high and the intermediate drip pan shall

extend a minimum of 6 inches in the downstream direction of the airflow. Each intermediate drain pan

shall be piped, to within 2 inches of the bottom drain pan.

2.12 DESICCANT DEHUMIDIFICATION SYSTEM

A. Desiccant Rotor

1. The desiccant shall be made “in-the-flute” encapsulating the fiberglass substrate.

2. The rotor shall be both washable and non-shedding. Rotors shall be capable of withstanding

cleaning by vacuum cleaner, with a water or, water and detergent wash.

3. The substrate shall be manufactured with a fiberglass matrix meeting the International Agency for

Research on Cancer (IARC) standards for non-respirable fibers.

4. The fiberglass substrate shall provide the structural support for the desiccant. The fiberglass

substrate shall be combined with desiccant to form the dehumidifier rotor. The desiccant shall be

self-bonding to the fiberglass substrate and to itself through the substrate voids filling in all the

voids in the substrate and shall totally encapsulate the fiberglass.

5. The desiccant dehumidification rotor shall be assembled from smooth and corrugated sheets of

fiberglass substrate interleaved in a winding to form the rotor creating a large number of axial

passages through which the air flows

6. Where a face and by-pass arrangement is indicated the performance shall meet the dew point

values of the mixed air downstream of the face and by-pass section.

7. Rotor surfaces shall be ground, polished smooth and coated for long seal life.

8. Rated lifetime shall not be less than (87,600) hours and shall be defined by media performance

meeting >90% of original specification.

9. Rotor media shall be tested to ASTM-E84 have result in Flame Spread and Smoke Developed

Indices of zero.

B. Desiccant Rotor – Cassette Frame

1. DH rotor cassette frames shall be manufactured from 304 tubular stainless steel. All welds shall be

reasonably ground and dressed for appearance. Structural welds shall be continuous and non-

structural welds shall be on 4” centers.

2. Cassette face panels and other sheet steel components shall be manufactured from 304 stainless

steel material.



C. Desiccant Rotor – Drive System

1. DH Rotor Drives shall be equipped with harden carbon steel ANSI drive sprocket, nickel plated

corrosion resistant drive chain and spring type automatic chain tension device.

2. For ease of maintenance and chain alignment the gear motor shall be fastened to a 304 stainless

steel gear motor plate which is fastened onto the cassette frame with standard hardware.

3. The drive assembly shall be equipped with a rotation detection circuit which shuts down the

dehumidifier and signals the operator through an indicating light on the control cabinet if the

wheel is not rotating.

D. Desiccant Rotor – Seals

1. Seals are to be “Viton®”. Rotor seals are rated for lifetime use (87,600 hours). Rotor seals shall

be rated for 400°F+ continuous temperature rating. Bulb type seals are not allowed.

2. Low friction tape is to be used as the complementary seal material to the Viton seal mentioned

above. The tape shall have an operating temperature range from -65°F to 500°F.

3. If additional sealing material is needed in the rotor assembly it is to be made of 100% Pure RTV

silicone is a one-component caulking material that has temperature ranges of -50°F to 450°F.

4. Rotor dividing seals contact the face of the Desiccant Rotor media to seal between the process and

reactivation airstreams. Standard hardware shall fasten the dividing seals flanges to the cassette

frame partitions and pop rivets shall not be used.

5. All other areas that have a potential for air bypass shall be RTV silicone sealed, this shall

eliminate and ensure that no air bypasses the rotor cassette assembly.

E. Reactivation – Direct Fired Burner

1. The reactivation heat source shall be full-modulation direct-fired gas. The capacity of the burner

shall be sufficient to provide scheduled performance.

2. The gas burner shall be suitable for burning with a modulating turn-down ratio of 20:1. The gas

burner shall have stainless steel baffles and non-clogging gas orifices. The burner assembly and

complete pre-piped manifold shall include main and pilot gas regulators, main motorized fuel

valve, 2 main safety shut off valves, pilot solenoid valve, main and pilot gas hand valves and

manually adjustable burner air flow profile plates. A butterfly type gas valve is not acceptable

due to poor control characteristics.

3. Pilot gas shall be automatically lit after a seven-second pre-purge timing by a spark rod that

utilizes a 6,000 volt ignition transformer. After a proven flame by the flame rod, the main burner

valve(s) open.

4. The gas burner shall be rated at no more than 390 MBH per foot of burner length, in order to

limit flame length, and minimize the generation of carbon monoxide.

5. The control safety circuit shall include, but not be limited to: air flow proving device, high

temperature limit switch, electronic primary flame safeguard with flame rod rectification, red

alarm light to indicate flame failure, microprocessor rate controller, reactivation fan motor starter

interlock and seven second combustion area pre-purge. Complete assemblies shall be pre-piped,

wired, and tested.

6. Reactivation rate controller shall be as described below. (See Microprocessor Controller section)

7. Single point reactivation leaving air temperature controls are not acceptable.

8. The direct-fired burner shall have capacities as indicated on the schedule.

F. Reactivation – Outlet Tunnel

1. The outlet tunnel casing shall be double insulated wall constructed of a minimum of 16 gauge

interior panels, exterior panels, interior tunnel flooring and 16 gauge interior liners. The interior

tunnel flooring shall incorporate a pan with drains. The panels shall form a self-framing casing

with no additional structural support required. All joints shall be caulked airtight with silicone

sealant. The interior panels, interior liner and the interior tunnel flooring material shall be 304

stainless steel.

2. The outlet tunnel casing shall be insulated with 3.0# per sq. ft. rigid, rot-proof, non-combustible

glass fiber insulation.



3. The fiberglass insulation shall conform to 25/50 (per ASTM E 84 and UL 723 and CAN/ULC

S102-M88). Meets NFPA 90A and 90B.

4. All joints shall be caulked airtight with silicone sealant.

5. The outlet tunnel drain pan shall have a fabricated drainage connection protruding through the

floor for the purpose of condensation drainage to the unit exterior.

6. Closures around all interior components shall be provided airtight. Closures shall be exceptions

but primarily of the same material used in the outlet tunnel interior and shall provide solid close-

off inside of the outlet tunnel walls. No air bypass or leakage around the components will be

allowed.

7. For ease of rotor shaft and bearing maintenance an access panel of the same material used in the

tunnel exterior shall be provided and mounted in the bottom corner located by the rotor axis.

8. Reactivation outlet hood and bird screen are to be made of punched 16 gauge 304 stainless steel.

G. Reactivation – Fan and Motor

1. Reactivation air fan shall be single width, single inlet, and airfoil type direct drive wheel, class

III, and fabricated of aluminum to minimize the potential for corrosion.

2. Fan inlet cone shall be of aluminum construction.

3. Motors shall be TEFC, NEMA premium efficiency, at the scheduled voltage, 3 phase, 60 Hertz

4. Motor horsepower shall be as indicated on the schedule.

5. Fan and motor shall be dynamically balanced as an assembly.

6. Reactivation motor shall be completely isolated from the reactivation air stream by means of a

shaft sealing plate.

H. Reactivation – Outlet Damper

1. Outlet system balancing damper is to be fabricated of 304 stainless steel material and consist of a

single damper blade and a locking quadrant.

I. Microprocessor Reactivation Rate Controller (RRC) (Internal to unit DDC)

1. The microprocessor controller shall control the unit’s reactivation rate, and safeguard functions.

2. Reactivation energy shall be controlled as follows:

a. Desiccant reactivation temperature shall be maintained at optimum temperature for

maximum dehumidification performance irrespective of outdoor temperature or filter

loading.

b. With diminished reactivation airflow (i.e. dirty filters) desiccant reactivation temperature

shall be limited to prevent rotor overheat.

c. On gas reactivation units, as moisture load decreases, reactivation outlet temperature rises

the microprocessor controller shall reset reactivation inlet temperature down as required to

limit reactivation outlet temperature. Reactivation rate control that uses a single temperature

sensor in the reactivation outlet airstream is NOT acceptable.

d. Fail-Safe Mode: In order to preserve limited performance, on gas or electric reactivation

units, if the desiccant reactivation inlet sensor fails the energy modulation shall be set to 50%

or less and if the reactivation outlet sensor fails, desiccant reactivation inlet shall maintain a

set-point of 260˚F.

e. On gas reactivation units, to prevent excessive heat on the rotor and seals the unit shall be

equipped with a manually reset high temperature limit downstream of the reactivation heat

source and upstream of the desiccant rotor. When tripped the reactivation heat source shall

cycle off.

f. Adequate reactivation energy shall be proven via reactivation outlet temperature. If the

reactivation outlet fails to achieve a minimum temperature set-point over a 15 minute period

the controller shall signal a low reactivation outlet temperature warning. The unit shall

continue to run.

g. Lack of desiccant rotor rotation shall be detected and shutdown initiated in the event of an

abnormal condition.

h. On gas or reactivation units, the reactivation fan shall remain on for two minutes after the

reactivation is disabled to allow for proper cool down of the reactivation tunnel.



2.13 SUPPLY FAN AND MOTOR

A. Belt Drive Plenum Fans

1. Belt drive fans shall be airfoil type plenum fans.

2. Fan inlet cone shall be of steel construction.

3. The fan wheels shall be supported by two outboard bearings which shall be of a self-aligning,

ball bearing, pillow block type and shall be designed for at least 200,000 hours L50 life. The

blower assembly shall be dynamically balanced.

4. Blower shafts shall be solid ground and polished. The shaft diameter shall be sized so that the

maximum operating speed for the Class does not exceed 70% of the first critical speed and the

shaft shall be coated with a rust inhibitor.

All V-belt drives shall be furnished in matched sets with reinforced rubber belts. The sheaves

shall be of a cast iron type and shall be complete with companion type driver sheave on drives

with three belts or more. All drives shall be complete with a split taper bushing. Smooth bore

sheaves are acceptable for single and dual groove adjustable pitch sheaves.

5. Motors 7.5HP and smaller shall have drive sheaves that are adjustable type

6. The service factor of the drive set shall not be less than 1.25.

7. An adjustable motor base shall be provided.

8. A piezometer flow measurement system shall be provided on all fans. It shall have pressure taps

plumbed to the exterior of the unit for proper system balancing and troubleshooting.

B. Fan Motors

1. Direct drive fan motors shall be NEMA premium efficient, TEFC.

2. Belt drive fans motors shall be NEMA premium efficient, ODP.

C. 1” Internal Vibration Isolation

1. The blower, motor, and drive assembly shall be mounted isolation springs with a non-skid

acoustical pad, locking screw and adjusting leveling bolt. The springs shall have a minimum of

one inch nominal deflection. The isolation base shall be complete with hold down bolts and

wood blocking to maintain the spring base in a rigid position for shipping.

2. On the inlet of the plenum fan shall be a minimum of 6" flexible ducting, rigidly fastened to the

blower and the blower inlet closure.

2.14 INDIRECT FIRED HEATER SECTION

A. The Duct Furnace module shall be indirect fired and comply with the current edition of ANSI Z83.8

Standard for Gas-Fired Duct Furnaces and be a Recognized Component by Intertek Testing Services

ETL.

B. The Duct Furnace module shall employ patented in-shot gas burners with integral carryovers, a tubular

heat exchanger assembly, a two speed draft inducer to provide for positive venting of flue gases, air

pressure switches to provide proof of air supply for combustion, direct spark ignition of the gas

burners with remote flame sensor to prove carryover across all burners, an automatic reset type high

limit switch to limit maximum outlet air temperature to less than 250 of, manual reset flame rollout

switches and a two stage redundant safety shut-off gas valve which regulates gas pressure to burner

supply manifold.

C. Duct Furnace heat exchanger tubes (Type 409 Stainless Steel .044 Min. Wall thickness produced to

ASTM A268) shall incorporate patented integral formed dimple restriction to eliminate noise

associated with expansion and contraction of internal flueway baffles during heating cycles.

D. Duct Furnace modules shall be listed for application downstream of refrigeration and cooling systems

and shall provide means for removal of condensate that occurs in the tubes during cooling operation.

E. Heat exchanger tubes shall have the dimpled restrictors formed to provide for an unobstructed drainage

path and tubes shall be formed to provide a positive pitch to promote condensate drainage. Drainage

shall be configured so that burners and burner surfaces are not exposed to condensate.



F. Duct Furnace shall incorporate a Direct Spark Ignition control module which is design certified by a

recognized national testing agency.

G. The control shall incorporate a 30 second minimum pre-purge period prior to trial for ignition and a 0.8

second flame failure response time. The control shall provide for up to 3 ignition retrials, each

preceded by an interpurge period. Control shall provide for automatic reset after one hour, to initiate

additional ignition trials if lockout occurs during a call for heat. The control shall incorporate an LED

indicator light to provide a flash code to identify the operating condition of the control and conditions

preventing normal operation of the ignition system should they occur.

H. The Duct Furnace shall employ a two-stage control system capable of a proven low-fire ignition

sequence that minimizes the noise associated with cold start conditions. On a call for heat by the two-

stage room thermostat, the control system shall initiate a low fire start sequence at 55% of its

maximum input rating.

2.15 VFD CONTROL

A. The unit shall be provided with a VFD for system balancing.

2.16 ELECTRICAL WIRING/LIGHTS/GFI

A. All electrical wiring shall be installed in thin wall EMT steel conduit. Use of lengths of flexible

conduit will be permitted when rigid conduit is not applicable; however, all flexible conduit shall be

liquid tight, and approved by Underwriter Laboratories

B. Where unit construction is such that wiring must be disconnected for shipment, terminal blocks in an

accessible enclosure shall be provided at the section points for future field wiring.

C. Unit panel shall be provided with a terminal strip for ready connection of required external control

wiring.

D. 26 Watt CFL Service Lights in Each Process Air Access Section, 1 Switch, 120v Power by Others

E. (1) 20 Amp, GFI Convenience Outlet for Each Unit, 120v Power Provided by Others

F. All work shall conform at the latest National Electric Code.

2.17 CONTROLS

A. The unit control panel shall be supplied with a “dead-front” style disconnect switch, control

transformers, microprocessor controller, fuses, terminal strip and IEC motor starter’s with circuit

breaker style overload protection. Fan/Blower motors shall be wired to the motor starters.

B. Terminal strip connection shall be available for customer’s smoke detection, fire protection, E-Stop, or

“other fault” inputs to shut down the unit.

C. The controller shall include a built-in terminal display. From this display all critical unit functions and

alarms may be monitored and adjusted. An optional duplicate display can also be connected for

remote monitoring and adjustments of the desiccant unit.

D. The controller shall include interface modules for connectivity to BAS systems using BACnet or

Modbus protocols.

E. Where scheduled, unit shall include the following: space mounted CO/NO2 transmitter and a CO2

transmitter. Remote push button station and control logic shall be included to initiate fixed duration

building contaminant purge mode. (shipped loose and installed by electrical trades)

F. Unit shall include a space mounted temperature and dew point transmitter. (shipped loose and installed

by electrical trades)



G. Unit shall include a remote user interface. The interface shall be identical in function and format to the

controller in the main control panel enclosure.

2.18 MARKINGS

A. The unit nameplate shall be 0.020" thick Aluminum with permanent fasteners. The nameplate shall be

permanently engraved with: Unit model number, serial number, unit Full Load Amps, supply voltage,

and filter schedule.

B. The unit shall be permanently marked with the equipment number as identified on the schedule.

C. Proper warning labels for high voltage and moving parts shall be permanently affixed to access doors

and guards.

D. Advisory labels for filter access shall be affixed to applicable doors.

E. Electrical connection, lifting points, air connections, water supply/return, and drains.

F. Indication of correct rotation shall be affixed to all electric motors.

G. An electrical ladder diagram shall be permanently affixed inside of the electrical control panel. The

schematic shall be specific to the project and not be a generic type encompassing features or options

not present on the unit. The schematic shall include the fuse replacement values and types.




B. Bid equipment to perform at an equivalent or greater level.

B. Dessicant Dehumidification Air Handling Unit #1:

a. Existing Unit to be replaced, Munters Drycool Model SAM30ME100GC.

b. Outside Ambient Summer Max: 89°, 102 gr/lb

Outside Ambient: 75°, 110 gr/lb

c. Conditioned space Summer Max: 78°, 64 gr/lb

Conditioned Space: 70°, 48 gr/lb

d. Supply Airflow: 30,000 cfm

e. Makeup Air: 19,210 cfm

f. Supply Fan: 30 hp, TSP 4.35” wg

g. Exhaust Fan: 15 hp, TSP 1.74” wg

h. Reactivation Fan: 3560 cfm, TSP 5.6”wg

i. Reactivation Heater: 750 MBtuh, Natural Gas, 6”-15” wg

j. Dessicant Wheel: 314.4 lb/hr moisture removal, 2.68” wg pressure drop

k. Enthalpy Wheel: 416.86 lb/hr, supply pressure drop .83” wg

l. Post Cooling Coil: Total/Sensible capacity 1333.22 MBtuh, 0.78” wg pressure drop

m. System Electrical: 460V/3 ph/60 Hz, Unit FLA 303, Unit MCA 314.7, Unit MOP 350, Disconnect

400A.

C. Dessicant Dehumidification Air Handling Unit #2:

a. Existing Unit to be replaced, Munters Drycool Model AM30GG.



b. Outside Ambient Summer Max: 89°, 102 gr/lb

c. Conditioned space Summer Max: 78°, 64 gr/lb

Conditioned Space: 55°, 32 gr/lb

d. Supply Airflow: 10,000 cfm

e. Makeup Air: 10,500 cfm

f. Supply Fan: 25 hp, TSP 6.43” wg

g. Exhaust Fan: 7.5 hp, TSP 1.26” wg

h. Reactivation Fan: 5 hp, 3020 cfm, TSP 3.55”wg

i. Reactivation Heater: 750 MBtuh, Natural Gas, 6”-15” wg

j. Dessicant Wheel: 257 lb/hr moisture removal, 2.27” wg pressure drop

k. Enthalpy Wheel: 341 lb/hr, supply pressure drop .52” wg

l. Post Cooling Coil: Total/Sensible capacity 409.03 MBtuh, 0.41” wg pressure drop

m. System Electrical: 460V/3 ph/60 Hz, Unit FLA 46.1, Unit MCA 53.1, Unit MOP 80, Disconnect 60A.

END OF SECTION

MECHANICAL EQUIPMENT FOR ICE ARANA – RFB #PUR0120 …

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Transcript of MECHANICAL EQUIPMENT FOR ICE ARANA – RFB #PUR0120 …