Specifications
PHYSICAL DATA — 538D018,024 AND 538B OUTDOOR HEAT PUMP UNITS
UNIT
538D018*
538B018
538D024*
538B024
538B030
538B036
(Single-Phase)
NOMINAL CAPACITY (Tons) 1
1
⁄
2
22
1
⁄
2
3
OPERATING WEIGHT (lb) 154 167 180 184
REFRIGERANT TYPE R-22
Control (Cooling) AccuRaterT Piston at Fan Coil Unit
Control (Heating) AccuRater Piston at Outdoor Unit
Factory Charge (lb)† 1.5
COMPRESSOR
Type Tecumseh Reciprocating Copeland Scroll
Model AW5519G AW5524G ZR28K1 ZR34K1
Oil (Recharge) (oz) 30 30 24 30
CRANKCASE HEATER
Watts 19 19 None None
OUTDOOR FAN Propeller, Direct Drive
Rpm 850 850 850 850
Diameter (in.)...No. of Blades 18...3 18...3 18...3 18...3
Pitch (Degrees) 25 27 27 31
Motor Hp
1
⁄
8
1
⁄
8
1
⁄
8
1
⁄
8
Nominal Air Cfm 1720 1720 1720 1720
OUTDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft)...No. of Coils 6.1...1.5 6.1...2 6.1...3 6.1...3
Fins/in. 15 15 15 15
CONTROLS
High-Pressure (psig)
Cutout 320±20
Cut-in 426 ± 7
Liquid Line Low-Pressure (psig)
Cutout 7± 3
Cut-in 22 ± 5
Fusible Plug 210 F
Defrost Method** Time and Temperature Defrost
Accumulator Yes
Control Voltage†† 24 v
REFRIGERANT LINES
Connection Type Sweat—Suction; Flare—Liquid
Liquid Line OD (in.)
3
⁄
8
3
⁄
8
3
⁄
8
3
⁄
8
Vapor Line OD (in.)
5
⁄
8
5
⁄
8
3
⁄
4
7
⁄
8
\
Maximum Length (ft) 200 200 200 200
Maximum Lift (Fan Coil Above) (ft) 65 65 65 65
Maximum Lift (Fan Coil Below) (ft) 150 150 150 150
EXTERNAL FINISH Alpine Mist (Beige)
*These units may only be used with 619E fan coil units.
†See Piston Guide tables on page 67 for proper charge. These units are shipped with a holding charge only.
**Demand defrost when used with 619E fan coil units.
††A 24-v transformer is provided in the fan coil unit; 538D018 and 024 units have their own transformers.
\ Valve connection size is
3
⁄
4
inch. Recommended line size is
7
⁄
8
inch.
12