5. E-Coated aluminum-fin coils shall have a flexible | | | 2) Low-pressure switch. | | | |
| epoxy polymer coating uniformly applied to all coil | | | 3) Dual freezestats (evaporator coil). | | |
| surface areas without material bridging between fins. | | | 4) High-pressure switch. | | | |
| Coating process shall ensure complete coil encapsu- | | | b. Supply-air thermostat shall be located in the unit. |
| lation. Color shall be high gloss black with gloss — | | |
| | | c. Heating section shall be provided with high- |
| 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 | | | temperature limit switch. | | | |
| including fin edges. Superior hardness characteris- | | I. Operating Characteristics: | | | |
| tics of 2H per ASTM D3363-92A and cross-hatch | | 1. Unit shall be capable of starting and running at 125 F |
| adhesion of 4B-5B per ASTM D3359-93. Impact | |
| | | ambient outdoor temperature per maximum load cri- |
| resistance shall be up to 160 in./lb (ASTM D2794- | | |
| | | teria of ARI Standard 360. | | | |
| 93). Humidity and water immersion resistance shall | | | | | |
| | 2. | Unit with | standard controls | will operate | in | cooling |
| be up to minimum 1000 and 250 hours respectively | |
| | | down to an outdoor ambient temperature of 40 F |
| (ASTM D2247-92 and ASTM D870-92). Corrosion | | |
| | | (4.4 C). | | | | | |
| durability shall be confirmed through testing to be no | | | | | | | |
| | | | | | | | |
| less than 1000 hours salt spray per ASTM B117-90. | | 3. Unit shall be provided with fan time delay to prevent |
| Coil construction shall be aluminum fins mechani- | | | cold air delivery. | | | |
| cally bonded to copper tubes. | | J. Electrical Requirements: | | | |
6. E-Coated copper-fin coils shall have a flexible epoxy | | | | |
| All unit power wiring shall enter unit cabinet at a single |
| polymer coating uniformly applied to all coil surface | |
| | location. | | | | | |
| areas without material bridging between fins. Coating | | | | | | |
| | K. Motors: | | | | | |
| process shall ensure complete coil encapsulation. | | | | | | |
| | 1. Compressor motors shall be cooled by | refrigerant |
| Color shall be high gloss black with gloss — 60 deg | |
| of 65 to 90% per ASTM D523-89. Uniform dry film | | | gas passing through motor windings and shall have |
| thickness from 0.8 to 1.2 mil on all surface areas | | | line break thermal and current overload protection. |
| including fin edges. Superior hardness characteris- | | 2. All fan motors | shall have permanently | lubricated, |
| tics of 2H per ASTM D3363-92A and cross-hatch | | | sealed bearings and inherent automatic-reset ther- |
| adhesion of 4B-5B per ASTM D3359-93. Impact | | | mal overload protection or manual reset calibrated |
| resistance shall be up to 160 in./lb (ASTM D2794- | | | circuit breakers. | | | |
| 93). Humidity and water immersion resistance shall | | 3. All indoor-fan motors 5 hp and larger shall meet the |
| be up to minimum 1000 and 250 hours respectively | |
| | | minimum efficiency requirements as established by |
| (ASTM D2247-92 and ASTM D870-92). Corrosion | | |
| | | the Energy Policy Act of 1992 (EPACT) | effective |
| durability shall be confirmed through testing to be no | | |
| | | October 24, 1997. | | | |
| less than 1000 hours salt spray per ASTM B117-90. | | | | | |
| | L. Special Features: | | | | |
| Coil construction shall be copper fins mechanically | | | | | |
| bonded to copper tubes with copper tube sheets. | | Certain features are not applicable when the features |
| Galvanized steel tube sheets shall not be acceptable. | | designated * are specified. For assistance in amending |
| A polymer strip shall prevent coil assembly from con- | | the specifications, contact your local Bryant Sales Office. |
| tacting sheet metal coil pan to maintain coating integ- | | 1. Roof Curbs (Horizontal and Vertical): | | |
| rity and minimize corrosion potential between coil | | | |
| | | a. Formed of 16-gage galvanized steel with wood |
| and pan. | | |
| | | nailer | strip | and shall be | capable of | supporting |
F. Refrigerant Components: | | |
| | entire unit weight. | | | |
Refrigerant circuit components shall include: | | | | | |
| | b. Permits installing and securing ductwork to curb |
1. | Thermostatic expansion valve (TXV). | | |
| | prior to mounting unit on the curb. | | |
2. | Filter driers. | | 2. | Horizontal Adapter Roof Curb: | | |
3. Gage port and connections on suction, discharge, | | | Includes factory-assembled adapter and internal |
| and liquid lines. | | | duct and substantially improves evaporator fan static |
G. Filter Section: | | | performance (static regain). | | | |
Standard filter section shall consist of 2 sizes of factory- | | | NOTE: Power exhaust or barometric relief must be |
installed 2-in. (51 mm) thick throwaway fiberglass filters of | | | mounted in the return ductwork when used in con- |
commercially available sizes. | | | junction with this accessory. | | | |
H. Controls and Safeties: | * | 3. | Integrated Economizer: | | | |
1. | Unit Controls: | | | a. Integrated type capable of simultaneous econo- |
| a. Economizer control (optional) | | | mizer | and | compressor | operation | to | provide |
| | | mechanical cooling while using outdoor air. |
| b. Capacity control (2-step) | | |
| | | b. Equipped with low-leakage parallel blade, gear |
| c. Unit shall be complete with self-contained low- | | |
| | | driven dampers not to exceed 2% leakage, at |
| voltage control circuit. | | | 1.0 in. wg (249 Pa) pressure differential. | |
2. | Safeties: | | | c. Actuator motor is 24-v, 53 lb torque spring return |
| a. Unit shall incorporate a solid-state compressor | | | direct coupled type design (close on loss of |
| lockout which provides reset capability at the | | | power). | | | | |
| space thermostat, should any of the following | | | | | | | | |
| safety devices trip and shut off compressor: | | | | | | | | |