FOR HVAC INSTALLER ONLY
11. Service
CAUTION
CAUTION: Servicing the
11.1 Technical Description
The
Refrigeration System of
The mixture of gas and liquid refrigerant enter the accumulator after leaving the evaporator coil. The accumulator prevents any liquid refrigerant from reaching the compressor. The compressor evacuates the cool refrigerant gas from the accumulator and compresses it to a high pressure and temperature
11.2 Troubleshooting
No dehumidification, neither fan nor compressor run with fan switch and ventilation timer OFF.
1.Unit unplugged or no power to outlet.
2.Humidity control set too high or defective.
3.Loose connection in internal or control wiring.
4.Defective Compressor relay.
5.Defective control transformer.
6.Optional Condensate Pump Safety Switch open.
No dehumidification, compressor does not run but fan runs with fan switch and ventilation timer OFF and humidity control turned to ON.
1.Defective compressor run capacitor.
2.Bad connection in compressor circuit.
3.Defective compressor overload.
4.Defective compressor.
5.Defrost thermostat open.
6.Optional Condensate Pump Safety Switch open.
Fan runs with fan switch and ventilation timer OFF, but compressor cycles on and off.
1.Low ambient temperature and/or humidity causing unit to cycle through defrost mode.
2.Defective compressor overload.
3.Defective compressor.
4.Defrost thermostat defective.
5.Dirty air filter(s) or airflow restricted.
6.Low refrigerant charge, causing defrost control to cycle.
7.Bad connection in compressor circuit. Fan does not run with fan switch in either position.
Fan does not run with ventilation timer activated. Compressor runs briefly but cycles on & off with humidity control turned to ON.
1.Loose connection in fan circuit.
2.Obstruction prevents fan rotation.
3.Defective fan.
4.Defective fan relay.
5.Defective fan capacitor.
Fan runs with fan switch ON. Fan does not run with ventilation timer activated.
1.Defective ventilation timer.
2.Time not correct on ventilation timer.
3.Ventilation timer set to manual and switched OFF.
4.Defective fan switch.
Evaporator coil frosted continuously, low dehumidifying capacity.
1.Defrost thermostat loose or defective.
2.Low refrigerant charge.
3.Dirty air filter(s) or airflow restricted.
4.Excessively restrictive ducting connected to unit.
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