Stimmen - 3, Durchschnittliche Bewertung: 3.7 ( )

Hersteller: Bryant Dateigröße: 6.7 mb Dateiname: Unterrichtssprache:

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 320 fpm at nominal airflows. 3. Filter section should use only one size filter. 4. Filters shall be accessible through an access panel with “no-tool” removal. I. Controls and Safeties: 1. Unit Controls: Unit shall be complete with self-contained low-voltage control circuit protected by a fuse on the 24-v transformer side (090-150 units have a resettable circuit breaker). 2. Safeties: a. Unit shall incorporate a solid-state compressor protector which provides anti-cycle reset capability at the space thermostat, should any of the following standard safety devices trip and shut off compressor. 1) Compressor overtemperature, overcurrent. 2) Loss-of-charge/low-pressure switch. 3) Freeze-protection thermostat, evaporator coil. 4) High-pressure switch. 5) Automatic reset motor thermal overload protector. 144 GUIDE SPECIFICATIONS — 580F036-151 AND 581B036-150 (cont) The lockout protection shall be easily disconnected at the control board, if necessary. b. Heating section shall be provided with the following minimum protections: 1) High-temperature limit switches. 2) Induced draft motor speed sensor. 3) Flame rollout switch. 4) Flame proving controls. J. Operating Characteristics: 1. Unit shall be capable of starting and running at 125 F ambient outdoor temperature, meeting maximum load criteria of ARI Standard 210/240 or 360 at + 10% voltage. 2. Compressor with standard controls shall be capable of operation down to 25 F ambient outdoor temperature. K. Electrical Requirements: All unit power wiring shall enter unit cabinet at a single factory-predrilled 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. Evaporator-fan motor shall have permanently lubricated bearings and inherent automatic-reset thermal overload protection. Evaporator motors are designed specifically for Bryant and do not have conventional horsepower (HP) ratings listed on the motor nameplate. Motors are designed and qualified in the “airover” location downstream of the cooling coil and carry a maximum continuous bhp rating that is the maximum application bhp rating for the motor; no “safety factors” above that rating may be applied. 3. Totally enclosed condenser-fan motor shall have permanently lubricated bearings, and inherent auto- matic-reset thermal overload protection. 4. Induced-draft motor shall have permanently lubricated sealed bearings and inherent automatic-reset thermal overload protection. M. 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. Roof Curbs (Horizontal and Vertical): a. Formed galvanized steel with wood nailer strip and shall be capable of supporting entire unit weight. b. Permits installation and securing of ductwork to curb prior to mounting unit on the curb. * 2. Integrated Economizers: a. Integrated integral modulating type capable of simultaneous economizer and compressor operation. During economizer operation, up to two compressors on sizes 090-150 will operate. b. Available as a factory-installed option in vertical supply/return configuration only. (Available as a field-installed accessory for dedicated horizontal and/or vertical supply return configurations.) c. Includes all hardware and controls to provide cooling with outdoor air. d. Equipped with low-leakage dampers, not to exceed 2% leakage at 1 in. wg pressure differential. e. Capable of introducing up to 100% outdoor air. f. EconoMi$er IV and EconoMi$er2 shall be equipped with a barometric relief damper capable of relieving up to 100% return air. g. Designed to close damper(s) during loss-ofpower situations with spring return built into motor. h. Dry bulb outdoor-air temperature sensor shall be provided as standard. Outdoor air sensor set point is adjustable and shall range from 40 to 100 F. For the EconoMi$er IV, the return air sensor, indoor enthalpy sensor, and outdoor enthalpy sensor shall be provided as field-installed accessories to provide enthalpy control, differential enthalpy control, and differential dry bulb temperature control. For the EconoMi$er2, the enthalpy, differential temperature (adjustable), and differential enthalpy control shall be provided as field- installed accessories. i. EconoMi$er IV controller shall use a mixed air thermistor mounted on the evaporator fan housing to control EconoMi$er IV operation to a supply air temperature of 55 F. j. The EconoMi$er IV and EconoMi$er2 shall have a gear-driven parallel blade design. k. EconoMi$er IV controller shall provide control of internal building pressure through its accessory power exhaust function. Factory set at 100%...

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