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Table 35 — MoistureMiser Dehumidification Subcooler Service Analysis
PROBLEM CAUSE REMEDY
Subcooler will not energize.
No power to control transformer from
evaporator-fan motor.
Check power source and evaporator-fan relay. Ensure
all wire connections are tight.
No power from control transformer to liquid line
solenoid valve
1. Fuse open; check fuse. Ensure continuity of wiring.
2. Low-pressure switch open. Cycle unit off and allow
low-pressure switch to reset. Replace switch if it will
not close.
3. Transformer bad; check transformer.
Liquid line solenoid valve will not operate. 1. Solenoid coil defective; replace.
2. Solenoid valve stuck open; replace.
Subcooler will not deenergize.
Liquid line solenoid valve will not open. Valve is stuck closed; replace valve.
Low system capacity.
Low refrigerant charge or frosted evaporator
coil.
1. Check charge amount. Charge per Fig. 47-51.
2. Evaporator coil frosted; check and replace low-
pressure switch if necessary.
Loss of compressor superheat
conditions with subcooler
energized.
Thermostatic expansion valve (TXV). 1. Check TXV bulb mounting, and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.