SECTION 15742

AIR COOLED REFRIGERANT CONDENSERS

PART 1 GENERAL

SECTION INCLUDES

Refrigerant condenser package.

Charge of refrigerant and oil.

Controls and control connections.

Refrigerant piping and connections.

Motor starters.

Electrical power connections.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section 15242 - Vibration Isolation: Placement of vibration isolators.

RELATED SECTIONS

Section 03300 - Cast-in-Place Concrete: Equipment bases.

Section 15170 - Motors.

Section 15242 - Vibration Isolation.

Section 15260 - Piping Insulation.

Section 15280 - Equipment Insulation.

Section 15535 - Refrigeration Piping and Specialties.

Section 15658 - Reciprocating Refrigerant Compressors.

Section 15790 - Air Coils.

Section 15952 - Controls and Instrumentation.

Section 16180 - Equipment Wiring Systems.

REFERENCES

ANSI/ASHRAE 15 - Safety Code for Mechanical Refrigeration.

ANSI/ASHRAE 90A - Energy Conservation in New Building Design.

ANSI/UL 207 - Refrigerant-Containing Components and

Accessories, Non-electrical.

ANSI/UL 303 - Refrigeration and Air-Conditioning Condensing and Compressor Units.

ARI 210/240 - Unitary Air Conditioning and Air-Source Heat Pump Equipment.

ASHRAE 20 - Methods of Testing for Rating Remote Mechanical Air-Cooled Refrigerant Condensers.

SUBMITTALS

Submit shop drawings under provisions of Section [01300.] [01340.]

Submit shop drawings indicating components, assembly, dimensions, weights and loading, required clearances, and location and size of field connections. Include schematic layouts showing condenser, refrigeration compressors, cooling coils, refrigerant piping and accessories required for complete system.

Submit product data under provisions of Section [01300.] [01340.]

Submit product data indicating rated capacities, weights, accessories, electrical requirements, and wiring diagrams.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

OPERATION AND MAINTENANCE DATA

Submit operation and maintenance data under provisions of Section [01700.] [01730.]

Include start-up instructions, maintenance instructions, parts lists, controls, and accessories.

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Comply with manufacturer's installation instruction for rigging, unloading and transporting units.

Protect units on site from physical damage. Protect coils.

PART 2 PRODUCTS

MANUFACTURERS

[______________________________] Model [__________.]

[______________________________] Model [__________.]

[______________________________] Model [__________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MANUFACTURED UNITS

Provide packaged, factory assembled, pre-wired unit, suitable for [outdoor] [indoor] use consisting of casing, condensing coil and fans, integral sub-cooling coil, [liquid accumulator] [screens,] and controls.

Construction and Ratings: In accordance with ARI 210/240[.] [and ANSI/UL 207 and ANSI/UL 303.] Testing shall be in accordance with ASHRAE 20.

Performance Ratings: In combination with equipment in Section 15658 and Section 15740, Energy Efficient Rating (EER) not less than prescribed by ANSI/ASHRAE 90A.

Performance: Heat rejection capacity of [_____] Btu/hr ([_____] W) with a saturated suction temperature of [_____] degrees F ([_____] degrees C), air entering condenser at [_____] degrees F ([_____] degrees C), condensing temperature [_____] degrees F ([_____] degrees C), condenser air flow [_____] cfm ([_____] L/sec), [_____] fan motors at [_____] hp ([_____] W).

CASING

House components in [welded steel frame with] [galvanized] steel panels with weather resistant, baked enamel finish.

Mount starters, disconnects, and controls in weatherproof panel provided with full opening access doors. Provide mechanical interlock to disconnect power when door is opened.

Provide removable access doors or panels with quick fasteners.

Provide welded steel floor mounting stand and duct collars at coil inlet and fan outlet.

CONDENSER COILS

Coils: Aluminum fins mechanically bonded to seamless copper tubing. Provide sub-cooling circuits. Air test under water to 425 psig (2900 kPa), and [vacuum] dehydrate. Seal[.] [with holding charge of [nitrogen.] [refrigerant.]]

Coil Guard: [Expanded metal][.] [Louvered][.] [with lint screens.]

Configuration: [Single refrigeration circuit][.] [Two refrigeration circuits each][.] [with receiver.]

FANS AND MOTORS

Vertical discharge [direct] [belt] driven propeller type condenser fans with fan guard on discharge[,][.] [equipped with roller or ball bearings with grease fittings extended to outside of casing.]

Weatherproof motors suitable for outdoor use, single phase permanent split capacitor or 3 phase, with permanent lubricated ball bearings and built-in [current and] thermal overload protection[,][.] [refer to Section 15170.]

Horizontal discharge, double width, double inlet [forward curved] [backward inclined] centrifugal type condenser fans, equipped with roller or ball bearings with grease fittings extended to outside of casing, V-belt drive with belt guard.

Motors as indicated, in compliance with Section 15170.

CONTROLS

Provide factory wired and mounted control panel, NEMA 250, containing fan motor starters, [fan cycling thermostats,] [head pressure controls,] compressor interlock and control transformer.

Provide controls to permit operation down to [_____] degrees F ([_____] degrees C) ambient temperature.

Provide thermostat to cycle fan motors in response to outdoor ambient temperature.

Provide head pressure switch to cycle fan motors in response to refrigerant condensing pressure.

Provide solid state control to vary speed of one condenser fan motor in response to refrigerant condensing pressure.

Provide electronic low ambient control consisting of mixing damper assembly, controlled to maintain constant refrigerant condensing pressure.

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Provide for connection to electrical service. Refer to Section 16180.

Install units on vibration isolation. Refer to Section 15242.

Provide connection to refrigeration piping system. Refer to Section 15535. Comply with ANSI/ASHRAE 15.

Provide cooling season start-up, winter season shut-down service, for first year of operation.

Shut-down system if initial start-up and testing takes place in winter and machines are to remain inoperative. Repeat start-up and testing operation at beginning of first cooling season.

SCHEDULES

Drawing_Code	ARC-1	ARC-2	ARC-3

Location

Manufacturer

Model Number

Cooling Capacity

Condenser

Entering Air Temp.

Condensing Temp.

Saturated Suction Temp.

Condenser Fans

Number

RPM

Motor

END OF SECTION