1-800-533-7533
Quest
DRY
70
Installation, Operation and Maintenance Instructions
17
www.QuestProtect.com
quest
quest
Fan is not running. Dehumidification or fan is being called for
1. Loose connection in fan circuit.
2. Obstruction prevents fan impeller rotation.
3. Defective fan.
4. Defective fan relay.
Low dehumidification capacity (evaporator is frosted continuously). Dehumidification is being called for
1. Defrost thermostat 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.
Unit 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. Air filter dirty.
5. Defective defrost thermostat.
6. Low refrigerant charge.
7. Air leak such as loose cover or ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
10.Optional Condensate Pump Safety Switch open.
Unit Test to determine problem:
1. Detach field control wiring connections from main unit.
2. Connect the yellow and green pigtails from the main unit together; only the fan should run. Disconnect
the wires.
3. Connect the yellow and blue pigtails from the main unit together; the compressor and fan should run.
4. If these tests work, the main unit is working properly. You should check the control panel and field
control wiring for problems next.
5. Remove the control panel from the mounting box and detach it from the field installed control wiring.
Connect the blue, yellow, and green wires from the control panel directly to the corresponding colored
pigtails on the main unit. Leave the violet, white and red wires disconnected!
6. Turn on the fan switch; the fan should run. Turn off the fan switch.
7. Turn on the humidity control; the compressor and fan should run.
8. If these tests work, the problem is most likely in the field control wiring.
10.3 Refrigerant Charging
If the refrigerant charge is lost due to service or a leak, a new charge must be accurately weighed in. If any of
the old charge is left in the system, it must be recovered before weighing in the new charge. Refer to the unit
nameplate for the correct charge weight and refrigerant type.
FOR HVAC INSTALLER ONLY
