Assessments - 3, GPA: 4.3 ( )

Fabricante : York Arquivo Tamanho: 571.08 kb Arquivo Nome : Língua de Ensino:

ANTI--RECYCLE TIMER --A timer to prevent the unit compressor from short cycling. It assures 5 minutes off time between compressor cycles. OUTDOOR COIL GUARD --Consists of grille--type sections for assembling over the outdoor coil to protect it from damage. WALL THERMOSTAT --The units are designed to operate with 24--volt electronic and electro--mechanical thermostats. All units can operate with single stage heat/single stage cool thermostats --with or without the economizer. To obtain maximum economizer operating savings, a two stage cooling thermostat should be used. To obtain two stage cooling operation, a jumper wire must be removed on the low voltage relay board. (See unit wiring diagram.) OUTDOOR THERMOSTAT --A 24--volt thermostat providing two stages of control for units equipped with supplemental electric heaters. Unitary Products Group 036-21564-002-A-0404 TYPICAL APPLICATIONS ROOF JACK INSTALLATION ROOF CURB INSTALLATION SLAB ON GROUND INSTALLATION TYPICAL ROOF-TOP INSTALLATION FIELD-SUPPLIED DISCONNECT SWITCH ROOF CURB CONDENSATE TRAP SUPPLY AIR DUCT CONTROL WIRING POWER TO TO INDOOR RETURN AIR SUPPLY THERMOSTAT DUCT Unitary Products Group 036-21564-002-A-0404 MECHANICAL SPECIFICATIONS GENERAL DESCRIPTION Units shall be factory--assembled, single packaged Heat Pumps, designed for outdoor mounted installation. Units shall have minimum SEER ratings of 10.0. They shall have built in field convertible duct connections for down discharge supply/return or horizontal discharge supply/return, and be available with factory installed options or field installed accessories. The units shall be factory wired, piped, charged with R--22 refrigerant and factory tested prior to shipment. All unit wiring shall be both numbered and color coded. Enclosed in each unit shall be a factory test log sheet consisting of the unit tested pressures, temperatures and amps, as tested prior to shipment. All units shall be manufactured in a facility certified to ISO 9001 standards, and the cooling & heating performance shall be rated in accordance with DOE and ARI test procedures. Units shall be listed under UL 1995/CAN/CSA No. 236--M90 conditions. UNIT CABINET 1. Unit cabinet shall be constructed of G90 galvanized steel, with exterior surfaces coated with a non--chalking, powered paint finish, certified at 750 hours salt spray test per ASTM--B117 standards. 2. Indoor blower section shall be insulated with up to 1" thick insulation, coated on the air side. Aluminum foil faced insulation shall be used in the furnace compartment and be fastened with ridged fasteners to prevent insulation from entering the air stream. 3. Cabinet panels shall be “large” size, easily removable for servicing and maintenance. 4. Full perimeter base rails shall be provided to assure reliable transit of equipment, overhead rigging, fork truck access and proper sealing on roof curb applications. 5. Disposable 1" filters shall be furnished and be accessible through a removable access door, sealed air tight. Units filter track shall be designed to accommodate either 1" or 2" filters. 6. Fan performance measuring ports shall be provided on the outside of the cabinet to allow accurate air measurements of evaporator fan performance without removing panels or creating air by--pass of the coils. 7. Units vertical discharge and return duct configuration shall be designed to fit between standard 24" O.C. beams without modification to building structure, duct work and base unit. 8. Condensate pan shall be internally sloped and conform to ASHARE 62--89 self--draining standards. Condensate connection shall be a minimum of 3/4" I.D. female and be a ridged mount connection. INDOOR (SUPPLY) FAN ASSEMBLY 1. Fan shall be direct drive, multi--speed, or a factory installed belt drive, adjustable--pitch motor pulley option. Job site selected (BHP) brake horse power shall not exceed the motors nameplate horse power rating, plus the service factor. Units shall be designed not to operate above service factor. 2. Fan wheel shall be double--inlet type with forward-curved blades, dynamically balanced to operate smoothly throughout the entire range of operation. Airflow design shall be constant air volume. 3. Bearings shall be sealed and permanently lubricated for longer life and no maintenance. OUTDOOR FAN ASSEMBLY 1. The outdoor fan shall be of the direct--driven propeller type, discharge air vertically, have aluminum blades riveted to corrosion resistant steel spider bracket and shall be dynamically balanced for smooth operation. 2. The outdoor fan motor shall be totally enclosed with permanently lubricated bearings and internally protected against overload conditions. REFRIGERANT COMPONENTS 1. Compressors: A. Shall be fully hermetic type, direct drive, internally protected with internal high--pressure relief and over temperature protection. The hermetic motor shall be suction gas cooled and have a voltage range of + or -10% of the unit nameplate voltage. B. Shall have internal i...

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