UNIT CABINET
Unit cabinet shall be constructed of galvanized steel with exterior surfaces coated with a
INDOOR (EVAPORATOR) FAN ASSEMBLY
Fan shall be a belt drive assembly and include an adjustable pitch motor pulley. Job site selected brake horsepower shall not exceed the motors nameplate horsepower rating plus the ser- vice factor. Units shall be designed to operate within the service factor. Fan wheel shall be double inlet type with forward curve blades, dynamically balanced to operate smoothly throughout the entire range of operation. Airflow design shall be constant volume. Bearings shall be sealed and permanently lubricated for longer life and no maintenance. Entire blower assembly and motor shall be slide out design.
OUTDOOR (CONDENSER) FAN ASSEMBLY
The outdoor fans shall be of the direct drive type, discharge air vertically, have aluminum blades riveted to corrosion resistant steel spider brackets and shall be dynamically balanced for smooth operation. The outdoor fan motors shall have permanently lubricated bearings internally protected against overload conditions and staged independently. A cleaning window shall be provided on two sides of the units for coil cleaning.
REFRIGERANT COMPONENTS
Compressors:
a. Shall be fully hermetic type, direct drive, internally protected with internal
b.Shall have internal spring isolation and sound muffling to minimize vibration and noise, and be externally isolated on a dedicated, independent mounting.
Coils:
a. Evaporator coils shall have aluminum plate fins mechanically bonded to seamless internally enhanced copper tubes with all joints brazed. Special Phenolic coating shall be available as a factory option.
b. Evaporator coils shall be of the direct expansion, draw- thru design.
c. Condenser coils shall have
d. Condenser coils shall be of the direct expansion, draw- thru design.
Refrigerant Circuit and Refrigerant Safety Components shall include:
a. Independent
b.Solid core filter drier/strainer to eliminate any moisture or foreign matter.
c.Accessible service gage connections on both suction and discharge lines to charge, evacuate, and measure refrigerant pressure during any necessary servicing or troubleshooting, without losing charge.
d.The unit shall have two independent refrigerant circuits, equally split in 50% capacity increments.
Unit Controls:
a. Unit shall be complete with
b. Unit shall incorporate a lockout circuit which provides reset capability at the space thermostat or base unit should any of the following standard safety devices trip and shut off compressor:
c.
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d.Unit shall incorporate “AUTO RESET” compressor over temperature, over current protection.
e.Unit shall operate with conventional thermostat designs and have a low voltage terminal strip for easy
f.Unit control board shall have
g.Standard controls shall include
h.Control board shall monitor each refrigerant safety switch independently.
i.Control board shall retain last 5 fault codes in non- volatile memory, which will not be lost in the event of a power loss.
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