Table 35 — MoistureMiser Dehumidification Subcooler Service Analysis
PROBLEM | CAUSE |
| REMEDY |
Subcooler will not energize. | No power to control transformer from | Check power source and | |
| all wire connections are tight. | ||
| No power from control transformer to liquid line | 1. | Fuse open; check fuse. Ensure continuity of wiring. |
| solenoid valve | 2. | |
|
|
| |
|
|
| 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 | 1. | Check charge amount. Charge per Fig. |
| coil. | 2. | Evaporator coil frosted; check and replace low- |
|
|
| pressure switch if necessary. |
Loss of compressor superheat | Thermostatic expansion valve (TXV). | 1. | Check TXV bulb mounting, and secure tightly to |
conditions with subcooler |
|
| suction line. |
energized. |
| 2. | Replace TXV if stuck open or closed. |
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