H24.REV

AIR COOLED CONDENSER SYSTEM

NOTE: FINAL COPY: JANUARY, 1987.

NOTE: THIS SECTION IS FOR USE WITH SELF-CONTAINED AIR CONDITIONERS (REMOTE CONDENSING TYPE) OR WITH RECIPROCATING COMPRESSOR UNITS

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for the following

1.	Piping.

2.	Air-cooled condenser.

3.	Refrigerant 22.

4.	Lubricant oil.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO. 1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections:

1.	PIPING.

2.	SELF-CONTAINED AIR CONDITIONERS.

3.	VIBRATION ISOLATION.

4.	BALANCING AIR AND WATER SYSTEMS.

5.	MOTORS.

6.	AUTOMATIC CONTROL SYSTEMS.

7.	PACKAGED AIR-COOLED WATER CHILLERS.

8.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for additional Reference Standards

4)	QUALITY ASSURANCE

A.	Refer to Section GENERAL PROVISIONS FOR HEATING, VNETILATING AND AIR CONDITIONING WORK for Guarantee and other Quality Assurance requirements

5)	SUBMITTALS

A.	Submit shop drawings for air-cooled condenser and liquid receiver and submit ASME Certificates and wiring diagrams

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Air-cooled condenser: Carrier Air Conditioning Co., Dunham-Bush., McQuay, Division of McQuay-Perfex Inc., Trane Co. and Kramer Trenton Co

2)	PIPE AND FITTINGS

A.	Refer to Section "PIPING" for refrigerant and refrigerant relief piping. Provide wrought copper fittings with high temperature silver solder joints for refrigerant piping. Provide wrought copper with soldered joints for refrigerant relief piping

3)	AIR-COOLED CONDENSER FOR REFRIGERANT 22

A.	Coils shall have seamless copper tubes and aluminum fins. Compressor, condenser, fans and liquid receiver shall be mounted on angle-iron frame with steel or aluminum casing and angle-iron supports

B.	Provide fans as follows:

FAN

1.	Propeller type.

2.	Centrifugal blower type with flanged connections for ductwork

FAN

3.	Provide fan guard.

C.	Wind deflector shall be fabricated same as housing.

NOTE: TOTALLY ENCLOSED FAN COOLED TYPE WEATHERPROOF MOTOR WITH RAIN SHIELD SHALL BE USED ON ALL INSTALLATIONS WHERE MOTOR IS EXPOSED TO WEATHER. OPEN DRIP PROOF WITH RAIN SHIELD MAY BE USED WHEN MOTOR IS MOUNTED INSIDE AND IS LOCATED IN AIR STREAM AND IS NOT EXPOSED TO OUTSIDE WEATHER

D.	Motors shall be as follows:

OPEN

1.	Totally enclosed, fan cooled.

2.	Open dripproof with rain shield.

OPEN

E.	Drives shall be as follows:

DRIVE

1.	Adjustable pitch belt drive with steel belt guard.

2.	Direct drive.

DRIVE

F.	Corrosion protection: Galvanized steel surfaces, except fan shaft

1.	Provide fan shaft, as follows:

EPOXY

a.	Epoxy coated.

b.	Zinc-chromatized.

c.	Zinc-phosphatized.

d.	Finish as approved.

EPOXY

G.	Automatic controls shall be factory wired, as follows:

COND

1.	Condensing pressure control suitable for operation at 0 deg F ambient air temperature

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

a.	Thermostat or pressure switch with control relay shall modulate fan discharge dampers and maintain adjustable preset refrigerant condensing temperature. Damper operator shall be instantly operable in low ambient temperature

2.	Condensing pressure control suitable for operation at 0 deg F ambient air temperature

a.	Receiver pressure shall be maintained by hot gas liquid heat exchanger. Rate of exchange shall be controlled by regulating valve responsive to changes in head pressure. As valve closes, liquid is forced into exchanger, raising receiver pressure and reducing refrigerant flow from condenser, thereby flooding condenser and reducing condensing surface

COND

H.	Condensing pressure control suitable for operation at 0 deg F ambient air temperature. Fan shall be cycled by sequenced fan speed controller. Terminals for interlocking shall prevent compressor operation unless fan is operating

I.	Units similar to Carrier, Model No. 9AB, 9DE or 9AD

4)	LIQUID RECEIVER

A.	Receivers shall be ASME construction: Smaller than 6 inch diameter shall be UL approved and 6 inch diameter and larger shall be ASME approved and stamped

B.	Capacity shall be minimum of 125 percent of complete operating charge. Provide complete with inlet and outlet service valves, charging connection and relief valve. Shielding, electric heater and controls as recommended by condenser manufacturer for year-round operation

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Size and install piping in conformance with latest recommendation of ASHRAE. Operating pressure shall be as per ASME Code for operating refrigerant pressures. Arrange to insure proper oil flow in system. Provide with efrigerant charge and lubricating oil charge

B.	Provide interlocking to prevent compressor operation unless condenser fan is operating

2)	FIELD QUALITY CONTROL

A.	Tests: Before charging each system, pressurize system to 300 psig with nitrogen and refrigerant mixture

1.	Test points of possible leakage to assure pressure tight, with halide testing device or other approved testing equipment. Evacuate system to 100 microns using high vacuum pumps

2.	With vacuum pump stopped, maintain vacuum in system for period of 24 hours without losing vacuum of more than 50 microns

B.	After proven pressure tight, charge system with refrigerant. Certify each system tested and accepted before turning over to Owner