Quest CDG 174
Installation, Operation and Maintenance Instructions
1-877-420-1330
10
www.QuestHydro.com
4.4 Refrigerant Charging
If the refrigerant charge is lost due to service or leak, a new charge must be accurately weighed in. If any of the old charge is left in
the system, it must be removed before weighing in the new charge. Refer to the unit nameplate for the correct charge weight and
refrigerant type.
4.5 Blower Replacement
The blower has a PSC motor and internal thermal overload protection. If defective, the complete assembly must be replaced.
1. Unplug power cord
2. Remove the front cover
3. Remove the 5 screws attaching blower inlet ring
4. Remove the 4 screws mounting impeller to underside of base plate
5. Disconnect the blower leads
6. Reassemble the new blower using the above procedure in reverse
4.6 Thermistor Replacement
The defrost thermistor probe is inserted into the coil measuring coil temperatures and reacts accordingly.
To replace thermistor:
1. Remove top cover and filter
2. Remove 5 screws holding front filter bracket
3. Remove the filter bracket and foam block underneath
4. Remove the 4 screws holding the control panel in place
5. Pull the thermistor probe from the evaporator coil, reinsert the new probe into the existing hole
6. Route the thermistor wire along the side of the heat exchanger
7. Detach and remove old thermistor wire from board
8. Attach thermistor probe wire onto board
9. Reassemble unit
4.7 Condensate Pump Replacement
The internal condensate pump removes water that collects in the reservoir.
To replace the condensate pump:
1. Unplug the unit
2. Remove the rear skidplate
3. Unplug the pump wires from the wire harness
4. Remove the condensate hose and the screw attaching the pump bracket to the base
5. Replace the pump, hose, wiring, bolts, and cover in the reverse order
