3533Specificationsline2docxJAY.pdf

WRA-3533 - SPECIFICATIONS FOR BID ITEM # 2

Air-Cooled Condensing Units With RIS Isolation Supports And Electro-Fin Coating

EK: RGL.ACU-2-6-3

Performance: Capacity (ton): 56.6

Input Power (kW): 67.1

Performance (EER): 10.1

IPLV(EER): 15.5

Evap Flow (gpm): 160.4

Evap PD (ft H₂0): 18.7

Altitude (ft): 0

Evaporator: EWT(◦F): 54.0

LWT(◦F): 44.0

Delta T (∆(◦F): 10.0

Condenser: Design Ambient (◦F): 95.0

Fan Diameter (in): 30.0

Fan Motor HP: 2.0

Fan RPM: 1,140

Low Ambient Control to (◦F): 35.0

Unit Airflow (CFM) 43,452

Physical: Length (in): 94

Width (in): 88

Height (in): 100

Refrigerant: R410a

2.01 Acceptable Manufacturers

A. McQuay International B. Trane C. Approved equal

2.02 Unit Description

A. Provide and install as shown on the plans factory-assembled, air cooled scroll compressor, R410A condensing units in the size and quantity specified. Each unit shall consist of hermetic scroll compressor air cooled condenser section;

B. The complete unit shall be UL listed.

2.03 Design Requirements

A. General: Provide a complete condensing unit as specified herein and as shown on the drawings. The unit shall be in accordance with the standards referenced in Section 1.02 and any local codes in effect;

B. Performance: Refer to the schedule of performance on the drawings.

2.04 Condensing Section (Scroll)

A. Air Cooled Condenser

1) Exterior panels shall be constructed of pre-coated steel with a 1,000 – hour ASTM B117 salt spray test;

2) The condensing section shall be open on the sides and bottom to provide access and to allow airflow through the coils. Condenser coils shall be constructed with 3/8” copper tubing mechanically bonded to aluminum fins for maximum heat transfer.

All copper connections and condenser coils shall be electro-fin™ coated and factory leak tested with high-pressure air under water;

3) Condenser fans shall be direct- drive, propeller-type designed for low tip speed, vertical air discharge and include service guards. Fan blades shall be constructed of steel and riveted to a steel centered hub. Condenser fan motor shall be direct drive, single phase permanently lubricated “PSC” motors with inherent thermal overload;

4) Unit shall have standard pressure controls that cycle the condenser fan motors to maintain condensing pressures for operation down to 0° F ambient.

B. Scroll Compressors

1) Unit shall have heavy-duty Copeland scroll compressors;

2) Compressors shall be equipped with thermal overload protection;

3) Compressors shall be isolated with resilient rubber isolators to decrease noise transmission;

4) Compressor circuit shall be compete with low pressure control, liquid line shut off valve and manual reset high pressure safety switch.

C. Refrigerant Circuit: Capped connections shall be external to the unit providing for field connection of refrigerant piping.

D. Unit shall have a liquid line and suction line service valve.

2.05 Controls

A. Unit shall be equipped with a 24-V terminal strip for field supplied and installed controls.

2.06 Electrical

A. All wiring shall comply with UL requirements. The unit shall be provided with a factory wired weatherproof control panel. Unit shall have a single point power terminal block for main power connection. A terminal board shall be provided for low voltage control wiring;

B. Unit shall be equipped with low voltage transformers and motor starters.

Part 3: Execution

3.01 Installation

A. Installation by MWRA staff in strict accordance with manufacturer’s requirements, shop drawings and contract documents;

B. Adjust and level unit in alignment on supports;

C. Coordinate electrical installation with electrical contractor;

D. Coordinate controls with control contractor.

3.02 Start-Up

A. Provide installation oversight as required;

B. Provide testing and starting of machine, and instruction to owner in its proper operation and maintenance.