Page 64
XP25
Crankcase Heater, Checkout and Status / Error Codes
OPERATION:
CRANKCASE HEATER (HR1)
Compressors in all units are equipped with a 40 or 70 watt (depending on unit size) belly-band type crankcase heater. The
heater prevents liquid from accumulating in the compressor. The heater is controlled by the crankcase heater thermostat.
CRANKCASE HEATER THERMOSTAT (S40)
Crankcase heater thermostat S40 controls the crankcase heater in all units and is located on the liquid line (see figure 2 on
page 6 for location).
1. When liquid line temperature drops below 50°F, the thermostat closes which results in the heater being energized.
2. When liquid line temperature rises above 70°F, the thermostat opens which results in the heater being de-energized.
Belly-Band Crankcase Heater - 240VAC, Watts
40 or 70
Crankcase Heater Thermostat
Figure 41. Belly-Band Crankcase Heater Thermostat
CHECKOUT:
Belly-Band Crankcase Heater: Using meter set on ohms, check crankcase heater resistance. If resistance is 0 ohms or
infinite, replace the crankcase heater.
Figure 42. Checking Belly-Band Crankcase Heater
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