Quest CDG 74
Installation, Operation and Maintenance Instructions
1-877-420-1330
7
www.QuestHydro.com
To reduce biological growth, always store the unit with a new filter and add a biofungicide that is approved for use with
copper, aluminum, polyethylene, and ABS plastic to the condensate pump. Please note that you must remove the front
housing from the CDG 74 first before adding the biofungicide to the pump.
To Flush:
1.
Run the condensate hose to a sanitary sewer drain.
2.
Plug the unit in but do not turn it on.
3.
Use the PURGE button to remove the chemical in the
pump. Run the pump until it runs dry
4.
Walk out the hose to drain it completely
5.
Replace the filter
4 Service
WARNING: Servicing the Quest CDG 74 with its high pressure refrigerant system and high voltage circuitry presents
a health hazard which could result in death, serious bodily injury, and/or property damage. Only qualified service
people should service this unit.
CAUTION: Do not operate unit without the front housing in place.
4.1 Technical Description
The Quest CDG 74 uses a refrigeration system similar to an air
conditioner’s to remove heat and moisture from incoming air
and to add heat to the air that is discharged.
Hot, high pressure refrigerant gas is routed from the
compressor to the condenser coil. The refrigerant is cooled
and condensed by giving up its heat to the air that is about to
be discharged from the unit. The refrigerant liquid then passes
through a filter/drier and capillary tubing which cause the
refrigerant pressure and temperature to drop. It next enters
the evaporator coil where it absorbs heat from the incoming air
and evaporates.
The evaporator operates in a flooded condition, which means
that all the evaporator tubes contain liquid refrigerant dur-
ing 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 compressor
after leaving the evaporator coil. The compressor evacuates the
cool refrigerant gas from the accumulator and compresses it to a
high pressure and temperature to repeat the process.
Figure 2: Refrigeration system of Quest
