AC SPECS - 192026 - 23 62 13 Packaged Air-Cooled Refrigerant Compressor and Condensing Units.pdf

Project No. YAQF-192026 23 62 13-1

SECTION 23 62 13 - PACKAGED AIR-COOLED REFRIGERANT COMPRESSOR AND

CONDENSING UNITS

PART 1 - GENERAL

1.1 DESCRIPTION:

A. This section includes specifications for air cooled condensing units for use with split system type air conditioning.

1.2 APPLICABLE PUBLICATIONS:

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

The publications are referred in the text by basic designation only.

ARI 210/240 Unitary Air Conditioning and Heat Pump Equipment ARI 365 Commercial and Industrial Unitary Air Conditioning Condensing Units ASHRAE 15 Safety Standard for Refrigeration Systems ASHRAE 90.1 Energy Standard for Buildings except Low Rise Residential Buildings NEC National Electrical Code UL Underwriters Laboratory

1.3 SUBMITTALS:

A. Submit air cooled condensing unit shop drawings including the following information:

specific manufacturer and model numbers, dimensional and weight data, required clearances, materials of construction, capacities and ratings, refrigerant type and charge, component information, size and location of piping connections, electrical connections, wiring diagrams and information for all specialties and accessories.

1.4 WARRANTY

A. Provide a ten year parts and 1-year labor warranty on the entire unit beginning upon substantial completion of project.

PART 2 – PRODUCTS

2.1 UNITS UP TO 5 TONS:

A. Air conditioning components shall create a matching system with the furnace.

B. All units shall be ENERGY STAR® qualified. Minimum performance shall be 17-SEER.

C. Provide factory assembled, outdoor mounted, air-cooled condensing unit suitable for on grade installation. Include compressor, air cooled condenser, refrigerant, lubrication system, interconnecting wiring, safety and operating controls, motor starting components and additional features as specified herein or required for safe, automatic operation.

1. This contractor is responsible for all additional costs, including electrical and controls costs, associated with multiple units. Refrigerant is to be R-410A.

D. Cabinet: Construct cabinet of heavy gauge, galvanized steel coated with weather resistant paint. Provide removable access panels to facilitate full access to the compressor, fan and control components.

E. Compressor: Provide two–stage scroll type compressor with built in motor winding temperature and current protection, liquid and suction service valves, gage ports, sight glass and liquid line filter dryer. Mount compressors on vibration isolators.

23 62 13-2

F. Condenser: Provide condenser coils with aluminum alloy plate fins mechanically fastened to seamless copper tubing with integral sub-cooler. Construct coils with design working pressure suitable for the refrigerant.

G. Fans: Provide variable-speed direct-drive statically and dynamically balanced propeller type fans with vertical discharge and guards constructed of heavy gage PVC coated wire.

H. Power Wiring: Provide factory installed 24-volt control circuit with fusing; control power transformer and all associated internal wiring. Provide a single point power connection to the unit(s). Provide factory installed magnetic contactors for compressor and condenser motors.

I. Controls: Provide high/low refrigerant pressure cutouts with manual reset and anti-short cycle compressor timer.

2.2 REFRIGERANT PIPING ACCESSORIES

A. Provide all refrigerant piping specialties with a maximum working pressure of full vacuum to 850-psig and a maximum working temperature of 225-deg F.

B. Flexible Pipe Connectors: Double braided bronze hose flexible pipe connectors with solder end connections.

C. Thermostatic Expansion Valves: Brass body, bronze disc, neoprene seat, bronze bonnet, stainless steel spring and solder end connections.

D. Charging Valves: Provide ¼-inch SAE brass male flare access ports with finger tight, quick seal caps. Provide 2-inch long copper extension sections.

E. Check Valves: Spring loaded type with bronze body, bronze disc, neoprene seat, bronze bonnet, stainless steel spring and solder end connections.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install units, piping and accessories in accordance with the manufacturer’s written instructions and recommendations.

B. Mount unit(s) on an appropriately sized precast or poured-in-place concrete pad so that unit will be positioned above grade a minimum of 2-inch.

C. Maintain adequate service access and airflow clearances for all components as recommended by the manufacturer.

D. Charge unit(s) with full oil charge and refrigerant charge based on the entire refrigeration system pipe size and length.

E. Provide all control wiring within conduit.

F. Coordinate power wiring requirements utilizing the existing service disconnect.

3.2 STARTUP

A. Adjust units for maximum operating efficiency, adjust all controls to required final settings and demonstrate that all components are functioning properly. Submit four copies of a written startup report following the initial start-up. Include in the report: work

23 62 13-3 done to the system, all readings taken, a statement certifying that the refrigeration system(s) are leak free and a statement certifying that the unit(s) have been placed in proper running condition as recommended by the manufacturer and as intended in the drawings and specifications.

3.3 CONSTRUCTION VERIFICATION

A. Contractor is responsible for construction verification procedures for each air conditioner and related components that are provided in accordance with the attached Construction Verification sections:

1. CV - 23 62 13 Packaged Air-Cooled Refrigerant Units

END OF SECTION