Quest CDG 174
Installation, Operation and Maintenance Instructions
1-877-420-1330
8
www.QuestHydro.com
The evaporator operates in a flooded condition, which means that all the evaporator tubes contain liquid refrigerant during normal
operation. A flooded evaporator should maintain constant pressure and temperature across the entire coil, from inlet to outlet.
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 to repeat the process.
4.3 Troubleshooting
No dehumidification, neither hour meter display nor compressor run and POWER button does not turn ON.
1. Unit unplugged or no power to outlet
2. Defective control board
3. Loose connection in internal wiring
No dehumidification, neither hour meter display nor compressor run with POWER button ON.
1. Defective control board
2. Loose connection in internal wiring
Some dehumidification, air mover runs continuously but compressor only runs sporadically.
1. Unit is in defrost cycle, DEFROST light on
2. Check to make sure humidistat is set high enough
3. Defrost thermistor defective or loose
4. Loose connection in compressor circuit
5. Defective compressor overload
6. Defective compressor
7. Defective relay
8. Low refrigerant charge
No dehumidification, air mover runs but compressor does not.
1. Bad connection in compressor circuit
2. Check to make sure humidistat is set high enough
3. Safety float switch closed, check pump reservoir
4. Defective compressor capacitor
5. Defective compressor overload
6. Defective compressor
7. Defective control board
8. Low refrigerant charge
