TROUBLESHOOTING
Refer to Tables 16-19 for Troubleshooting details.
Table 16 — 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 evapora-
tor coil.
1. Check charge amount. Charge per Fig. 42-45.
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.
Fig. 44 — Cooling Charging Chart, 50HJ012
with Optional MoistureMiser
Dehumidification Package
Fig. 45 — Cooling Charging Chart, 50HJ014
with Optional MoistureMiser
Dehumidification Package
34
Summary of Contents for 50HJ008-014
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