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SPECIFICATIONS — 538D HEAT PUMP UNITS
UNIT 538D 009 012 018 024
NOMINAL CAPACITY (Tons)
3
⁄
4
11
1
⁄
2
2
OPERATING WEIGHT (lb) 60.7 66.6 154 167
REFRIGERANT TYPE R-22
Control (Cooling) Fixed Orifice at Outdoor Unit AccuRaterா Piston at Fan Coil Unit
Control (Heating) Fixed Orifice at Outdoor Unit AccuRater Piston at Outdoor Unit
Factory Charge (lb)* 1.5 2.0 5.0 5.1
COMPRESSOR TYPE Carlyle Rotary Tecumseh Reciprocating
Model EBA095111H EBB130111H AW5519G AW5524G
OUTDOOR FAN Propeller Type Propeller, Direct Drive
Rpm (Cooling and Heating) 1050 1050 850 850
Nominal Air Cfm (High Speed) — — 1720 1720
OUTDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft)...No. of Rows 3.5...1 3.5...2 6.1...1.5 6.1...2
Fins/in. 18 18 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 210 F 210 F
Defrost Method† Time and Temperature Defrost Time and Temperature Defrost
Accumulator Yes Yes Yes
Control Voltage** 115 230 24
REFRIGERANT LINES
Connection Type Flare Sweat—Suction; Flare—Liquid
Mixed Phase Line OD (in.)
1
⁄
4
1
⁄
4
3
⁄
8
3
⁄
8
Suction Line OD (in.)
1
⁄
2
1
⁄
2
5
⁄
8
5
⁄
8
Maximum Length (ft) 35 35 200 200
Maximum Lift (Fan Coil Above Outdoor) (ft) 16 16 65 65
Maximum Lift (Fan Coil Below Outdoor) (ft) 30 30 150 150
EXTERNAL FINISH Grey Alpine Mist (Beige)
*Units are shipped with charge listed (smallest applicable system charge). Refer to Piston Guide tables on page 21
for proper charge for your application.
†Demand defrost.
**A 24-v transformer is provided in the 018, 024 fan coil unit.
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