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11
R250| LGR Dehumidifier Installation, Operation, and Maintenance Instructions
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 front cover.
8. Defective compressor.
9. Restrictive exhaust ducting.
10. Faulty defrost thermostat
Unit runs but does not pump water.
1. Hose kinked or plugged.
2. Pump defective.
3. Bad connection in pump circuit.
4. Hose disconnected internally.
Unit pumps water automatically but not when purge switch is pushed.
1. Bad connection in purge switch circuit.
2. Defective purge switch.
Evaporator coil frosted continuously, low dehumidifying capacity.
1. Defrost thermostat loose or defective.
2. Low refrigerant charge.
3. Dirty air filter or air flow restricted.
Compressor runs with power switch OFF.
1. Defective relay.
2. Defective power switch.
5.3 AIR MOVER
The motorized impeller has a PSC motor and internal thermal overload protection. If
defective, the complete assembly must be replaced.
1. Unplug power cord
2. Remove the four screws attaching the bottom plate to the lower housing
3. Disconnect the impeller leads
4. Remove the four screws holding the impeller to the bottom plate
5. Reassemble the new impeller using the above procedure in reverse
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