Bryant 581A/B manual Guide Specifications 581A210-300 Units

GUIDE SPECIFICATIONS — 581A210-300 UNITS

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

HVAC GUIDE SPECIFICATIONS

SIZE RANGE: 18 TO 25 TONS NOMINAL (COOLING)

250,000 TO 400,000 BTUH, NOMINAL (INPUT HEATING)

BRYANT MODEL NUMBERS: 581A

PART 1 — GENERAL

1.01SYSTEM DESCRIPTION

Unit is an outdoor rooftop mounted, electrically controlled heating and cooling unit utilizing scroll hermetic compres- sors with crankcase heaters for cooling duty and gas com- bustion heat for heating duty. Supply air shall be discharged downward or horizontally, as shown on con- tract drawings.

1.02QUALITY ASSURANCE

A.Unit shall well exceed the energy efficiency requirements of ASHRAE standard 90.1-2001. Unit shall be Energy Star qualified.

B.Unit shall be rated in accordance with ARI Standards 270 and 360 and all units shall be designed in accordance with UL Standard 1995.

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

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

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

F.Insulation and adhesive shall meet NFPA 90A require- ments for flame spread and smoke generation.

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

H.Unit shall be manufactured in a facility registered to ISO 9001:2000.

1.03 DELIVERY, STORAGE, AND HANDLING

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

PART 2 — PRODUCTS

2.01EQUIPMENT (STANDARD)

A.General:

The 581A 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 field start-up.

B.Unit Cabinet:

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.

3.Cabinet panels shall have minimum 1/2-in. thick, 1.5-lb. density insulation. Each external access panel shall be permanently attached to the rooftop unit. Panels shall also include tiebacks.

4.Filters shall be accessible through an access panel.

5.Holes shall be provided in the base rails (minimum 14 gage) for rigging shackles and level travel and movement during overhead rigging operations.

6.Fork lift slots shall be available from two sides of the unit (end and side).

7.Unit shall contain a sloped drain pan, to prevent standing water from accumulating. Pan shall be fabri- cated of epoxy powder coated steel.

C.Fans:

1.Indoor blower (evaporator fan):

a.Centrifugal supply air blower shall have pillow- block ball bearings and adjustable belt drive. Blower assembly shall slide out of unit for servicing.

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

c.The indoor fan system (blower wheels, motors, belts, and both bearings) shall slide out for easy access.

2.Condenser fans shall be of the direct-driven propeller type, with corrosion-resistant blades riveted to corro- sion-resistant steel supports. They shall be dynami- cally balanced and discharge air upwards. Condenser fan motors shall be totally enclosed and be of a shaft down design.

3.Induced-draft blower shall be of the direct-driven, sin- gle 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.Reverse rotation protection capability.

5.Crankcase heaters shall only be activated during compressor OFF mode.

E.Coils:

1.	Constructed of galvanized steel (G90 — 1.8 oz. of	1.	Standard evaporator and condenser coils shall have
	zinc per square foot of sheet metal), bonderized and		copper or aluminum plate fins mechanically bonded
	primer-coated on both sides and coated with a baked		to seamless internally grooved copper tubes with all
	polyester thermosetting powdercoating finish on the		joints brazed.
	outer surface.	2.	Coils shall be leak tested at 150 psig (1034 kPa) and
2.	Indoor blower compartment interior surfaces shall be
			pressure tested at 450 psig (3103 kPa).
	insulated with a minimum 1/ -in. thick, 1 lb density
	2

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