3533Specificationsline1docxJAY.pdf

WRA-3533 - SPECIFICATIONS FOR BID ITEM # 1

UNIT SIZE; AGZ070D

UNIT TYPE; Package Chiller

REFRIGERANT; R410A

ARI Performance: 50.6 TON, 8.2 EER, 15.4 IPLV

Bidders must meet all efficiency standards of ASHRAE, Standard 90.1.

SUBMITTALS

Submit shop drawings and product data in accordance with these specifications. Specifications shall include the following:

1. Dimensioned plan and elevation view drawings, required clearances and location of all field connections;

2. Summary of all auxiliary utility requirements such as electricity, water, etc. Summary shall indicate quality and quantity of each required utility.

3. Single line schematic drawing of the field power hookup requirements, indicating all items that are furnished.

4. Schematic diagram of control system indicating points for field interface/connection.

5. Diagram shall fully delineate field and factory wiring.

6. Certification of factory-run test of chiller unit signed by company officer

7. Five (5) copies of Installation Manuals.

QUALITY ASSURANCE

Qualifications: Equipment manufacturer must specialize in the manufacture of the products specified and have a minimum of five (5) years of experience in the fabrication of Air-Cooled Scroll Chillers.

Chiller manufacturer plant must be ISO002 Registered.

DELIVERY

Chiller shall be delivered to the DITP Plant fully assembled* and charged with refrigerant and oil by the manufacturer

CHILLER COMPONENTS

1. Compressors: The compressors shall be sealed hermetic, scroll type with crankcase oil heater and suction strainer. Compressor shall have a forced-feed lubrication system with a reversible oil pump and oil charge. The compressor motor shall be refrigerant gas cooled, high torque, hermetic induction type, tow-pole, with inherent thermal protection on all three phases and shall be mounted on R/S vibration isolator pads.

2. Evaporator: Evaporator shall be a compact, high efficiency, dual circuit, copper-brazed plate to plate type heat exchanger consisting of parallel stainless steel plates.

It shall be protected with an electric resistance heater and insulate with ¾” thick closed – cell polyurethane insulation. This combination shall provide freeze protection down to -20º F ambient air temperature.

3. Condenser: Standard Package Condenser.

a. The condenser coils shall consist of 3/8” seamless copper tubes mechanically bonded into plate-type fins. The fins shall have full drawn collars to completely cover the tubes.

b. A sub-cooling coil shall be an integral part of the main condenser coil.

Condenser fans shall be propeller type arranged for vertical air discharge and individually driven by direct drive fan motors. They shall be equipped with a heavy-gauge fan guard. Fan motors shall be TDAO, three-phased, direct driven, 1140 rpm.

4. Refrigerant Circuit. Standard Package. The refrigerant circuit shall include a refrigerant filter-drier, sight glass with moisture indicator, liquid line solenoid valve, Thermal Expansion Valve and insulated suction line.

5. Construction. Unit casing and all structural members and rails shall be fabricated of steel and painted to meet ASTM B117, 500-hour salt spray test.

6. Control System. A centrally located weatherproof control panel shall contain the field power connection points, control interlock terminals and control system. Power and starting components shall include factory circuit breaker of fan motors and control circuit, individual contractors for each fan motor, solid-state compressor three-phase overload protection and unit power terminal blocks for connection to remote disconnect switch Terminals shall also be provided for power supply to the evaporator heater circuit. Hinged access doors shall be lockable. Barrier panels or separate enclosures are required to protect against accidental contact with line voltage when accessing the control system.

7. An advanced DDC microprocessor unit controller with a 4-line by 20-character liquid crystal display provides the operating and protection functions. The controller shall take preemptive limiting action in case of high discharge pressure or low evaporator pressure. The controller shall contain the following features at a minimum:

a. Equipment Protection. The unit shall be protected in two ways: (1) by alarms that shut the unit down and require manual reset to restore unit operation and

(2) by limit alarms that reduce unit operation in response to some out-of-limit condition. Shut down alarm shall activate an alarm signal.

b. Shutdown Alarms.

(1) No evaporator water flow

(2) Sensor failures

(3) Low evaporator pressure

(4) Evaporator freeze protection

(5) High condenser pressure

(6) Outside ambient temperature

(7) Motor protection system

(8) Phase voltage protection

8. Digital Inputs

(1) Unit off switch

(2) Remote start/stop

(3) Flow switch

(4) Ice mode switch, converts operation and set points for ice protection

(5) Motor production

9. Digital Outputs.

a. Shutdown alarm; field wired, activates on an alarm condition, off when alarm is cleared

b. Evaporator pump; field wired, starts pump when unit is set to start

10. Condenser fan control – The unit condenser shall provide control of condenser fans based on compressor discharge pressure.

11. Building Automation System (BAS) Interface.

a. Factory mounted DDC controllers shall support operation on a BACnet, Modbus or LONMARK network via one of the date link/physical layers listed below as specified by the successful Building Automation System (BAS) supplier.

b. BACnet MS/TP mater (Clause 9)

c. BACnet IP, (Annex J)

d. BACnet ISO 8802-3, (Ethernet)

e. LONMARK FFT-10A. The unit controller shall be LONMARK certified.

f. The information communicated between the BAS and the factory mounted unit controller shall include the reading and writing of data to allow unit monitoring, control and alarm notification as specified in the unit sequence of operation and the unit points list.

g. For chillers communicating over a LONMARK network, the corresponding LONMARK eXternal Interface File (XIF) shall be provided with the chiller submittal data.

h. All communication from the chiller unit controller as specified in the points list shall be via standard BACnet objects. Proprietary BACnet objects shall not be allowed. BACnet communications shall conform to the BACnet protocol (ANSI/ASHRAE135-2001). A BACnet Protocol Implementation Conformance Statement (PICS) shall be provided along with the unit submittal.

OPTIONS AND ACCESSORIES

1. The following options are to be included:

a. Hot gas bypass, field piped, on all circuits

b. Low ambient, variable speed, head pressure control to -10° F

c. High Ambient Control Panel for operation from 105º F up to 125° F ambient temperatures

d. Aluminum coils with ElectroFin® *** baked epoxy coating for additional protection. This coating system shall provide 5,000 + hour salt spray resistance (ASTM B117-90) and be applied to both the coil and the coil frame.

e. Single-point power connection to non-fused disconnect switch, with individual circuit breakers

f. Factory installed circuit breaker to provide unit short circuit protection

g. Phase loss with under/over voltage protection and with LED indication of the fault type.

DESCRIPTION:

REFRIGERATION CIRCUIT

PERFORMANCE

Capacity (ton): 50.6

Input Power (kW): 73.9

Performance (EER): 8.2

IPLV (EER): 15.4

Evap. Flow (gpm): 175.0

Evap. PD (ft. H20): 20.9

UNIT MODEL; Air Cooled Scroll Chiller, 60 Hz

UNIT SIZE; 4 Fan Units, 065D

UNIT TYPE; Package Chiller

REFRIGERANT; 410 A

SOUND; WS with sound reduction for compressor

SOUND TREATMENT; Standard

UNIT OPERATION; Standard Operation (40F-50F LWT)

PHYSICAL;

Copper Coil Weight. (lbs):

Louver Weight. (lbs):

Refrigerant; R410A

Refrigerant Charge (lb/unit):

Length (in): 94

Width (in): 88

Height (in): 100

EVAPORATOR-Brazed Plate;

EWT (° F) 54

LWT (° F) 44.0

Delta T (° F) 10.0

Min. Flow Rate (gpm): 87.2

Max. Flow Rate (gpm): 223.1

EVAPORATOR HEADS; Left Hand Connections

EVAPORATOR INSULATION; Single Layer ¾”

CONDENSOR;

Design Ambient (º F): 95

Fan Motor (hp): 2.0

Fan RFM: 1,140

Low Ambient Control to (°F) 35.0

Unit air Flow (CFM): 43,452

CONDENSOR COIL FINS; Aluminum Fin w/Electrofin** Coating

HEAD PRESSURE; FANTROL ONLY (35º F MIN.)

GUARDS; Condenser Coil Grilles Only

COMMUNICATION; Bacnet w/ Ethernet

CONTROLS; MicroTech III w/No Remote Display

CONTROL BOX AMBIENT; 105° F Standard

VOLTAGE;460V/60HZ/3PH

STARTER; Across the Line

POWER CONNECTION; Single pt, disc sw w/comp isolating ckt breakers

PHASE/VOLTAGE; Phase & under/over voltage protection w/LED

UNIT CIRCUIT PROTECTION; Unit Ground Fault

UNIT OPTIONS; 115V GFI Outlet

WATER FLOW INDICATOR; On Evaporator Only

TUBING OPTIONS; Liq and Disch (Standard) plus Suction Shut-off Valves

UNIT CAPACITY CONTROLS; Electronic Expansion Valve

PUMP CONTROL OUTPUT; Dual Evap Pumps – Dual Output

APPROVALS; ETL/cETL Approval (no AHRI)

GLYCOL; ETHYLENE 50%

* Except units with remote evaporators

** No alternative accepted

***Trademark of Applied Surface Technology, Inc.

Acceptable Manufacturers:

1. McQuay Air Conditioning

2. Trane

3. Approved Equal