Bryant 581A/B manual 251

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

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

5.Gas piping shall be capable of being routed through the roof curb directly into unit.

G.Refrigerant Components:

Refrigerant circuit components shall include:

1.Thermostatic expansion valve (TXV).

2.Filter driers.

3.Gage port and connections on suction, discharge, and liquid lines.

H.Filter Section:

Standard filter section shall consist of 2 sizes of factory- installed 2-in. thick throwaway fiberglass filters of com- mercially available sizes. Filters shall be approximately 10% efficient with an airside pressure drop of approxi- mately 0.07 in. wg (clean).

I.Controls and Safeties:

1.Unit Controls:

a.Economizer control (optional).

b.Capacity control (2-step).

c.Unit shall be complete with self-contained low- voltage control circuit.

J.Safeties:

a.Unit shall incorporate a solid-state compressor lockout which provides reset capability at the space thermostat, should any of the following safety devices trip and shut off compressor:

1)Compressor lockout protection provided for either internal or external overload.

2)Low-pressure switch.

3)Dual freezestats (evaporator coil).

4)High-pressure switch.

b.Supply-air thermostat shall be located in the unit.

c.Heating section shall be provided with the follow- ing minimum protections:

1)High-temperature limit switch.

2)Induced-draft motor speed sensor.

3)Flame rollout switch.

4)Flame proving controls.

5)Redundant gas valve.

K.Operating Characteristics:

1.Unit shall be capable of starting and running at 120 F ambient outdoor temperature per maximum load cri- teria of ARI Standard 360.

2.Unit with standard controls will operate in cooling down to an outdoor ambient temperature of 40 F.

3.Unit shall be provided with fan time delay to prevent cold air delivery.

L.Electrical Requirements:

All unit power wiring shall enter unit cabinet at a single location.

M.Motors:

1.Compressor motors shall be cooled by refrigerant gas passing through motor windings and shall have line break thermal and current overload protection.

2.All fan motors shall have permanently lubricated, sealed bearings and inherent automatic-reset ther- mal overload protection or manual reset calibrated circuit breakers.

3.All indoor-fan motors 5 hp and larger shall meet the minimum efficiency requirements as established by

the Energy Policy Act of 1992 (EPACT) effective October 24, 1997.

N.Special Features:

Certain features are not applicable when the features designated * are specified. For assistance in amending the specifications, contact your local Bryant Sales Office.

1.Coils:

a.Optional pre-coated aluminum-fin coils shall have a durable epoxy-phenolic coating to provide pro- tection in mildly corrosive coastal environments. Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert barrier between the aluminum fin and copper tube. Epoxy-phenolic barrier shall minimize gal- vanic action between dissimilar metals.

b.Optional copper-fin coils shall be constructed of copper fins mechanically bonded to copper tubes and copper tube sheets. Galvanized steel tube sheets shall not be acceptable. A polymer strip shall prevent coil assembly from contacting the sheet metal coil pan to minimize potential for gal- vanic corrosion between coil and pan. All copper construction shall provide protection in moderate coastal environments.

c.E-Coated aluminum-fin coils shall have a flexible epoxy polymer coating uniformly applied to all coil surface areas without material bridging between fins. Coating process shall ensure complete coil encapsulation. Color shall be high gloss black with gloss — 60 deg of 65 to 90% per ASTM D523-89. Uniform dry film thickness from 0.8 to

1.2mil on all surface areas including fin edges. Superior hardness characteristics of 2H per ASTM D3363-92A and cross-hatch adhesion of 4B-5B per ASTM D3359-93. Impact resistance shall be up to 160 in./lb (ASTM D2794-93). Humidity and water immersion resistance shall be up to minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM D870-92). Corro- sion durability shall be confirmed through testing to be no less than 1000 hours salt spray per ASTM B117-90. Coil construction shall be alumi- num fins mechanically bonded to copper tubes.

d.E-Coated copper-fin coils shall have a flexible epoxy polymer coating uniformly applied to all coil surface areas without material bridging between fins. Coating process shall ensure complete coil encapsulation. Color shall be high gloss black with gloss — 60 deg of 65 to 90% per ASTM D523-89. Uniform dry film thickness from 0.8 to

1.2mil on all surface areas including fin edges. Superior hardness characteristics of 2H per ASTM D3363-92A and cross-hatch adhesion of 4B-5B per ASTM D3359-93. Impact resistance shall be up to 160 in./lb (ASTM D2794-93). Humidity and water immersion resistance shall be up to minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM D870-92). Corro- sion durability shall be confirmed through testing to be no less than 1000 hours salt spray per ASTM B117-90. Coil construction shall be copper fins mechanically bonded to copper tubes with copper tube sheets. Galvanized steel tube sheets shall not be acceptable. A polymer strip shall pre- vent coil assembly from contacting sheet metal coil pan to maintain coating integrity and minimize corrosion potential between coil and pan.

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