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Quest 185 Cool
Installation, Operation and Maintenance Instructions
21
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Low dehumidification capacity (evaporator is frosted continuously). Dehumidification is being called for.
1. Defrost thermostat loose or defective.
2. Low refrigerant charge.
3. Dirty air filter(s) or air flow restricted.
4. Excessively restrictive ducting connected to unit.
No ventilation. Ventilation is being called for.
1. Loose connection in ventilation control circuit.
2. Loose connection in damper power circuit.
3. Defective fresh air damper.
Dehumidifier removes some water, but not as much as expected.
1. Air temperature and/or humidity have dropped.
2. Humidity meter and or thermometer used are out of calibration.
3. Unit has entered defrost cycle.
4. Dirty air filter(s) or air flow is restricted.
5. Defective defrost thermostat.
6. Low refrigerant charge.
7. Air leak such as loose cover or ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
Troubleshooting Procedure for Control Related Issues.
This method of diagnosis will test the 3 main components of the control circuit individually to indicate any potential
problems. This is to be used when the control will not activate the main unit.
1. Detach field control wiring connections from the pigtails on the main unit.
2. Connect the yellow and green wire pigtails
together; only the fan should run. Disconnect the wires.
3. Connect the yellow and blue wires pigtails together; fan and compressor should run.
Disconnect the wires.
4. If this test works, the main unit is working
correctly from a control standpoint.
5. Reconnect field control wiring to the pigtails on the main unit.
6. Remove the control panel cover and detach the field wiring from the control connections.
7. Connect the yellow and green wires together; only the fan should run. Disconnect the wires.
8. Connect the yellow and blue wires together; fan and compressor should run. Disconnect the wires.
9. If this test works, then the field control wiring is ok.
10. If the problem persists, then the control is most likely faulty.
