Bryant 581A/B manual 579F/580F/581A155-300, Part 1 General

GUIDE SPECIFICATIONS — 579F/580F180-300 AND 581A155,180 SIZE UNITS

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

HVAC GUIDE SPECIFICATIONS

SIZE RANGE: 13 AND 15 TONS (581A), 15 TO 25 TONS (579F, 580F), NOMINAL (COOLING)

230,000 TO 360,000 BTUH, NOMINAL (INPUT HEATING) (GAS UNITS)

BRYANT MODEL NUMBERS: 580F, 579F, 581A

PART 1 — GENERAL

1.01SYSTEM DESCRIPTION

Unit is an outdoor rooftop mounted, electrically controlled heating and cooling unit utilizing scroll hermetic compres- sors for cooling duty and gas combustion 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 shall be rated in accordance with ARI Standards 270 and 360 and all units shall be designed in accordance with UL Standard 1995.

NOTE: Size 300 units are beyond the scope of ARI certifi- cation guidelines.

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

C.Unit shall be ETL and ETL, Canada tested and certified in accordance with ANSI Z21.47 Standards as a total package.

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

E.Insulation and adhesive shall meet NFPA 90A require- ments for flame 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 9001:2000.

1.03DELIVERY, STORAGE, AND HANDLING

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

PART 2 — PRODUCTS

2.01EQUIPMENT (STANDARD) A. General:

3.Cabinet panels shall be easily removable for servic- ing. Cabinet panels are minimum 20 gage. Panels shall have 1/2-in. thick, 1.5-lb. density insulation.

4.Filters shall be accessible through an access panel.

5.Holes shall be provided in the base rails (minimum 12 gage) for rigging shackles to facilitate overhead rigging.

6.Unit shall contain a sloped drain pan, to prevent standing water from accumulating. Pan shall be fabri- cated of hot dipped zinc coated minimum spangle steel. Zinc coating shall be G90 designation accord- ing to ASTM Standard A653. Unit shall contain a factory-installed nonferrous main condensate drain connection.

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 external static pressure capable fan drive. The alternate fan drive option shall have a factory-installed external high static pressure capable fan drive.

b.Fan wheel shall be made from steel with a corrosion-resistant finish. It shall be a dynamically balanced, 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 dynamically 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 finish and shall be dynamically balanced.

D.Compressor(s):

1.Fully hermetic, scroll type, internally protected.

2.Factory spring-shock mounted and internally spring mounted for vibration isolation.

3.On electrically and mechanically independent refrig- erant circuits.

4.All compressors shall have 70 W crankcase heaters.

E.Coils:

579F/580F/581A155-300

Each unit shall be a factory assembled, single-piece heat- ing and cooling unit. Contained within the unit enclosure shall be all factory wiring, piping, controls, refrigerant charge (R-22), and special features required prior to field start-up.

B.Unit Cabinet:

1.Constructed of galvanized steel (G90 — 1.8 oz. of zinc per square foot of sheet metal), bonderized and primer-coated on both sides and coated with a baked polyester thermosetting powdercoating finish on the outer surface.

2.Indoor blower compartment interior surfaces shall be

insulated with a minimum 1/2-in. thick, 1 lb density fiberglass insulation. Fiberglass insulation shall be bonded with a thermosetting resin (8 to 12% by weight nominal, phenol formaldehyde typical), and coated with an acrylic or other material that meets the NFPA 90 flame retardance requirements and has an ‘‘R’’ Value of 3.70. Aluminum foil-faced fiber- glass insulation shall be used in the gas heat compartment.

1.Standard evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seam- less internally grooved copper tubes with all joints brazed.

2.Coils shall be leak tested at 150 psig and pressure tested at 450 psig.

F.Heating Section:

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

2.a. 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.

b.The optional stainless steel heat exchangers shall be tubular-section design and shall be con- structed of a minimum 20 gage, 409 stainless steel.

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

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