Bryant 580D manual GUIDE SPECIFICATIONS Ð 579F180-300, Hvac Guide Specifications, Part 1 Ð General

GUIDE SPECIFICATIONS Ð 579F180-300

PACKAGED ROOFTOP ELECTRIC COOLING UNIT WITH GAS HEAT Ð CONSTANT VOLUME APPLICATION

HVAC GUIDE SPECIFICATIONS

SIZE RANGE: 15 TO 25 TONS, NOMINAL (COOLING) 172,000 to 360,000 BTUH, NOMINAL (INPUT HEATING)

MODEL NUMBER: 579F

Part 1 Ð General

1.01SYSTEM DESCRIPTION

Unit is an outdoor rooftop mounted, electrically controlled heating and cooling unit utilizing a reciprocating semi- hermetic compressor(s) for cooling duty and gas combus- tion for heating duty. Supply air shall be discharged downward or horizontally (with horizontal supply/return curb adapter assembly), as shown on contract drawings. Standard unit shall include a manual outdoor-air inlet.

1.02QUALITY ASSURANCE

A.Unit (180-290) shall be rated in accordance with ARI Standards 270 and 360 and all units shall be designed in accordance with UL Standard 1995.

NOTE: The 579F300 is beyond the scope of the ARI cer- ti®cation program.

B.Unit shall be designed to conform to ASHRAE 15.

C.Unit shall be ETL and ETL, Canada tested and certi®ed in accordance with ANSI Z21.47 Standards as a total pack- age.

D.Roof curb shall be designed to conform to NRCA Standards.

E.Insulation and adhesive shall meet NFPA 90A require- ments for ¯ame spread and smoke generation.

F.Unit casing shall be capable of withstanding 500-hour salt spray exposure per ASTM B117 (scribed specimen).

G.Unit shall be manufactured in a facility registered to ISO 9002/BS5750, Part 2.

1.03DELIVERY, STORAGE, AND HANDLING

Unit shall be stored and handled per manufacturer's recommendations.

Part 2 Ð Products

2.01EQUIPMENT (STANDARD)

A.General:

The 579F unit shall be a factory assembled, single-piece heating and cooling unit. Contained within the unit enclo- sure shall be all factory wiring, piping, controls, refrigerant charge (R-22), and special features required prior to ®eld start-up.

B.Unit Cabinet:

1.Unit cabinet shall be constructed of galvanized steel, bonderized and coated with a prepainted baked enamel

®nish.

2.Indoor blower compartment interior surfaces shall be insulated with a minimum 1¤2-in. thick, 1 lb density neo- prene cooled, ®berglass insulation coated on the air side. Aluminum foil-faced ®berglass insulation shall be used in the gas heat compartment.

3.Cabinet panels shall be easily removable for servicing.

4.Filters shall be accessible through an access panel.

5.Holes shall be provided in the base rails for rigging shackles to facilitate overhead rigging.

6.Unit shall have a factory-installed internal condensate drain connection and a sloped condensate pan.

C.Fans:

1.Indoor blower (evaporator fan):

a.Fan shall be belt driven. Belt drive shall include an adjustable pulley. The standard fan drive shall have a factory-installed low-medium static pres- sure fan drive. The alternate fan drive option shall have a factory-installed high static pressure fan drive.

b.Fan wheel shall be made from steel with a corro- sion resistant ®nish. It shall be a dynamically bal- anced, double-inlet type with forward-curved blades.

2.Condenser fans shall be of the direct-driven propeller type, with corrosion-resistant blades riveted to corrosion-resistant steel supports. They shall be dy- namically balanced and discharge air upwards.

3.Induced-draft blower shall be of the direct-driven, single inlet, forward-curved, centrifugal type. It shall be made from steel with a corrosion-resistant ®nish and shall be dynamically balanced.

D.Compressor(s):

1.The reciprocating semi-hermetic compressor(s) has factory-installed external spring vibration isolation.

2.Factory-installed crankcase heater prevents refriger- ant dilution of oil.

3.The 180 size semi-hermetic compressor shall be equipped with an electric unloader for capacity con- trol. Additional ®eld-supplied unloaders are not recom- mended on any 180-300 sizes.

4.Compressors shall be on mechanically and electrically independent circuits (216-300 sizes).

E.Coils:

1.Standard evaporator and condenser coils shall have copper or aluminum plate ®ns mechanically bonded to seamless internally grooved copper tubes with all joints brazed.

2.Optional precoated coils shall be coated with a baked-on organic, epoxy, phenolic coating.

F.Heating Section:

1.Induced-draft combustion type with energy saving direct-spark ignition system and redundant main gas valve.

2.The heat exchanger shall be of the tubular-section type constructed of a minimum of 20-gage steel coated with a nominal 1.2 mil aluminum-silicone alloy for corrosion resistance.

3.Burners shall be of the in-shot type constructed of aluminum-coated steel.

4.All gas piping shall enter the unit at a single location.

G.Refrigerant Components:

Refrigerant circuit components shall include:

1.Fixed expansion device with ®lter driers.

2.Service valve gage and connections on suction, dis- charge, and liquid lines.

3.Thermostatic expansion valve (size 180) or ®xed ori- ®ce feed system (sizes 216-300).

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