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

GUIDE SPECIFICATIONS — 581A210-300 UNITS (cont)

581A210-300

3.Optional pre-coated aluminum-fin coils shall have a durable epoxy-phenolic coating to provide protection 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 galvanic action between dissimilar metals.

4.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 galvanic corrosion between coil and pan. All copper construction shall provide protection in moderate coastal environments.

5.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 encapsu- lation. 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 1.2 mil on all surface areas including fin edges. Superior hardness characteris- tics 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). Corrosion durability shall be confirmed through testing to be no less than 1000 hours salt spray per ASTM B117-90. Coil construction shall be aluminum fins mechani- cally bonded to copper tubes.

6.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 1.2 mil on all surface areas including fin edges. Superior hardness characteris- tics 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). Corrosion 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 prevent coil assembly from con- tacting sheet metal coil pan to maintain coating integ- rity and minimize corrosion potential between coil and pan.

F.Heating Section:

1.Induced-draft combustion type with energy saving direct-spark ignition system and redundant main gas valve with 2-stage capability.

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.

5.Stainless steel heat exchanger shall be available.

G.Refrigerant Components:

Each refrigerant circuit shall include:

1.Thermostatic expansion valve (TXV) with removable power element.

2.Filter driers.

3.Gage port and connections on suction and discharge.

H.Filter Section:

Standard filter section shall consist of factory-installed 2-in. thick throwaway fiberglass filters.

I.Controls and Safeties:

1.Electro-Mechanical Control:

a.Economizer control (optional).

b.Capacity control (2-step).

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

2.Safeties:

a.Unit shall incorporate a solid-state compressor lockout which provides optional 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 protection.

3)Freeze protection (evaporator coil).

4)High-pressure protection (high pressure switch or internal).

b.Induced draft heating section shall be provided with the following 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.

J.Operating Characteristics:

1.Unit shall be capable of starting and running at 125 F ambient outdoor temperature per maximum load criteria of ARI Standard 360.

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

3.Size 18 and 20 ton units shall have 3 fully indepen- dent refrigerant circuits to allow for 33% capacity per circuit.

K.Electrical Requirements:

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

L.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.

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