ENGINEER'S SPECIFICATION GUIDE Ð OUTDOOR UNITS (Models 538A, 538C, 538D, and 538S )

GENERAL: Furnish and install a Model 538A, 538C, 538D, or 538S air-to-air outdoor unit in combination with a fan coil unit in the location and manner shown on the plan drawings. The unit shall be designed and tested for use with Refrigerant R-22 and shall be equipped with refrigerant line ®ttings which permit sweat or ¯are connections.

Nominal system electrical characteristics shall be v,

single phase, 60 Hz. Each unit shall be capable of satisfactory

operation within voltage range of

 

 

v to

 

 

v.

MAXIMUM DIMENSIONS: Outdoor unit Ð width

 

 

in.,

depth

 

in., height

 

 

inches.

 

 

COOLING CAPACITY: Total system cooling capacity shall not

be less than

 

 

Btuh with indoor air quantity of

 

cfm at

 

 

 

F wet bulb temperature of air entering

outdoor unit. Sensible heat capacity shall not be less than

 

Btuh with

 

F dry bulb temperature. Compres-

sor power input shall be

 

 

v or less at these conditions.

HEATING CAPACITY (Heat Pump Systems Only): Total heating

capacity shall be

 

 

Btuh or greater (integrated rating)

when rated at

 

 

 

F dry-bulb outdoor ambient with cfm

and

 

 

F entering (heating) coil. The equipment must

have a minimum HSPF of

 

 

. Compressor shall be ca-

pable of operation in heating duty down to −20 F outdoor am- bient air temperature (with accessory low-ambient kit). Unit shall be capable of simultaneous heating duty and defrost cycle operation.

OUTDOOR SECTION: The coil shall be constructed of alumi- num plate ®ns mechanically bonded to copper tubing with all

joints brazed. Coil shall be

 

rows deep with a nominal

®n spacing of

®ns per in., and shall have a face area of

not less than

 

square ft.

 

Outdoor unit shall contain a fully hermetic compressor with a crankcase heater (non-scroll units), oil system, operating oil charge, internal motor protection, and spring isolation. Outdoor fans shall be direct-drive propeller type, shall discharge air hori- zontally, shall be totally enclosed, and shall have permanently lubricated sleeve bearings.

CONTROL CIRCUIT: Controls and protective devices shall in- clude time-delay restart, automatic restart on power failure, 3-pole contactors (3 phase units), safety lockout if any safety is open, high-pressure and loss-of-pressure switches, automatic outdoor-fan motor protection, start capacitor and relay (single- phase units without scroll compressors), system diagnostics and high condensing temperature protection , compressor mo- tor current and temperature overload protection, high pressure relief, and outdoor fan failure protection. A 24-v transformer shall be factory installed and wired on outdoor units for external control circuit (size 018 and 024 only).

APPROVALS: Unit shall be constructed in accordance with ASHRAE 15 (latest revision), NEC, and CSA. Unit shall carry the UL listing label.

FIELD-INSTALLED ACCESSORIES: Low-ambient kit (538A, 538C, 538D), liquid solenoid valve, wall mount kit, crankcase heater (reciprocating-compressor units only) and winter start kit (538C, 538S).

31

Page 31
Image 31
Bryant 619E manual Outdoor unit. Sensible heat capacity shall not be less than