Tranquility
®
Digital (DXM2)—Troubleshooting Guide
Rev.: 10 March, 2015
52
Geothermal Heating and Cooling
Definitions of Conditions
MOTOR WINDINGS OVERHEATED
When the compressor is drawing normal amps and becomes
overheated and cycles by the overload, it is due to the tem-
perature of the suction gas being too high to remove heat
from the compressor motor. This in turn is due to under-
charge, superheat too high or restriction in refrigerant circuit.
HIGH OR LOW VOLTAGE
Check nameplate on unit for voltage rating. Check voltage
at contactor or starter while the unit is operating. This volt-
age should not vary by more than 10% plus or minus from
nameplate.
EXPANSION VALVE EQUALIZER LINE RESTRICTED
Check the equalizer line visually for external damage.
EXPANSION VALVE DIAPHRAGM CASE COLDER THAN
THE BULB
If the diaphragm case becomes colder than the bulb, the
charge will leave the bulb and condense in the diaphragm
case. Thus, bulb control will be lost.
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