Bryant 581B manual Guide Specifications, Part 1 General, Part 2 Products

GUIDE SPECIFICATIONS

PACKAGED ROOFTOP COOLING UNIT WITH GAS HEAT — CONSTANT VOLUME APPLICATION

HVAC GUIDE SPECIFICATIONS

SIZE RANGE: 3 TO 121/2 TONS, NOMINAL COOLING 72,000 TO 250,000 BTUH,

NOMINAL INPUT HEATING

BRYANT MODEL NUMBER: 581B

PART 1 — GENERAL

1.01 SYSTEM DESCRIPTION

Outdoor rooftop- or slab-mounted, electrically controlled heating and cooling utilizing a scroll compressor for cool- ing duty and gas combustion for heating duty. Unit shall discharge supply air vertically or horizontally as shown on contract drawings.

1.02QUALITY ASSURANCE

A.Unit shall be rated in accordance with ARI Standards 210/ 240 or 360 and 270.

B.Unit shall be designed to conform to ASHRAE 15, latest revision, and in accordance with UL 1995.

C.Unit shall be UL tested and certified in accordance with ANSI Z21.47 Standard and UL listed and certified under Canadian Standards as a total package for safety requirements.

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.

C.Fans:

1.Indoor blower (evaporator fan) shall be of the belt-driven, double inlet, forward-curved centrifugal type. Belt drive shall include an adjustable-pitch motor pulley.

2.Indoor blower (evaporator fan) shall be made from steel with a corrosion-resistant finish and shall be dynamically balanced.

3.Bearings shall be of the sealed, permanently lubri- cated, ball-bearing type for longer life and lower maintenance.

4.Condenser fan shall be of the direct-driven propeller type and shall discharge air vertically upward.

5.Condenser fan shall have aluminum blades riveted to corrosion-resistant steel spiders and shall be dynam- ically balanced.

6.Condenser-fan motor shall be totally enclosed.

7.Induced draft blower shall be of the direct-driven, sin- gle inlet, forward curved, centrifugal type, 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 rubber-shock mounted and internally spring mounted for vibration isolation.

3.On independent circuits (sizes 090-150).

E.Coils:

1.Evaporator and condenser coils shall have aluminum plate fins mechanically bonded to enhanced copper tubes with all joints brazed.

F. Unit casing shall be capable of exceeding Federal Test Method Standard No. 141 (Method 6061) 500-hour Salt Spray Test.

G.Each 581B unit is subjected to completely automated run testing on the assembly line. Each unit contains a factory- supplied printout indicating tested pressures, amperages, data, and inspectors; providing certification of the unit status at the time of manufacture.

1.03DELIVERY, STORAGE, AND HANDLING

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

PART 2 — PRODUCTS

2.01EQUIPMENT (STANDARD)

A.General:

Factory-assembled, single-piece heating 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.Unit cabinet shall be constructed of galvanized steel, bonderized and coated with a baked enamel finish on all externally exposed surfaces, and have primer- coated interior surfaces on all panels.

2.Tube sheet openings shall be belled to prevent tube wear.

3.Evaporator coil shall be of the face-split design.

F.Heating Section:

1.Induced draft combustion type with energy saving direct spark ignition system, 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 cabinet at a single location.

5.The Integrated Gas Control (IGC) board shall provide timed control of evaporator fan functioning and burner ignition. An LED (light-emitting diode) shall provide diagnostic information. The LED shall be vis- ible without removing the control box access panel.

6.IGC board contains anti-cycle protection for gas heat operation (after 4 continuous cycles on high temper- ature limit switch and one cycle on the flame rollout switch).

2.Evaporator-fan cabinet interior shall be insulated with

a minimum 1/2-in. thick flexible fiberglass insulation coated on the air side. Aluminum foil-faced fiberglass insulation shall be used in the heating compartment.

3.Cabinet panels shall be easily removable for servicing.

4.Holes shall be provided in the base rails for rigging shackles to facilitate overhead rigging, and forklift slots shall be provided to facilitate maneuvering.

5.Unit shall have a factory-installed, sloped conden- sate drain pan made of a non-corrosive material, pro-

viding a minimum 3/4-in. connection with both vertical and horizontal drains and shall comply with ASHRAE 62.

6.Unit shall have factory-installed filter access panel to provide filter access with tool-less removal.

7.Unit shall have standard thru-the-bottom power con- nection capability.

G.Refrigerant Components:

Refrigerant circuit components shall include:

1.Fixed-orifice type feed system.

2.Refrigerant strainer.

3.Service gage connections on suction, discharge, and liquid lines.

4.Filter drier.

5.Ability to route gage hoses through unit top cover (unit sizes 036-072 only).

H.Filter Section:

1.Standard filter section shall consist of factory- installed low-velocity, throwaway 2-in. thick fiberglass filters of commercially available sizes.

2.Filter face velocity shall not exceed 300 fpm at nomi- nal airflows.

3.Filter section shall use only one size filter.

4.Filters shall be accessible through an access panel with ‘‘no-tool’’ removal.

60