Quest Dry
Quest CDG 74
Installation, Operation and Maintenance Instructions
Installation, Operation and Maintenance Instructions
– Read and Save These Instructions –
This manual is provided to acquaint you with the dehumidifier so that installation, operation and maintenance can
proceed successfully. Ultimate satisfaction depends on the quality of installation and a thorough understanding of
this equipment. The dehumidifier is built around tested engineering principles and has passed a thorough inspection
for quality of workmanship and function.
Specifications subject to change without notice.
4201 Lien Rd
Madison, WI 53704 Toll-Free 1-877-420-1330
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TS-975
11/16 Rev. A
Quest CDG 74 Installation, Operation and Maintenance Instructions
Table of Contents
Introduction ......................................................................1
Safety ..........................................................................3
1. Specifications ............................................................ 4
2. Operation .................................................................. 4
2.1 Transporting ......................................................... 4
2.2 Location ................................................................ 4
2.3 Electrical Requirements .....................................5
2.4 Condensate Removal ..........................................5
2.5 Ducting .................................................................5
2.6 Defrost Cycle ......................................................5
2.7 Power Button .......................................................5
2.8 Purge Button .......................................................6
2.9 Hour Meter ..........................................................6
2.10 Hours Button .....................................................6
2.11 Defrost Light .......................................................6
3. Maintenance ............................................................... 6
3.1 Air Filter ................................................................6
3.2 Storage .................................................................6
4. Service .........................................................................7
4.1 Technical Description ..........................................7
4.2 Troubleshooting ...................................................8
4.3 Air Mover .............................................................9
4.4 Thermistor .........................................................10
4.5 Condensate Pump .............................................10
4.6 Float Safety Switch ...........................................10
5. Options & Accessories ............................................10
6. Wiring Diagram ......................................................... 11
7. Service Parts ............................................................. 12
Warranty ................................................................... 14
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Quest CDG 74 Installation, Operation and Maintenance Instructions
Safety Precautions
Read the installation, operation and maintenance instructions carefully before installing and operating
this device. Proper adherence to these instructions is essential to obtain maximum benefit from your
Quest CDG 74.
READ AND SAVE THESE INSTRUCTIONS
• The device is designed to be installed INDOORS IN A SPACE
THAT IS PROTECTED FROM RAIN AND FLOODING.
• Install the unit with space to access the back or side panels for
maintenance and service. DO NOT INSTALL UNIT WITH THE
SERVICE PANELS INACCESSIBLE.
• Avoid directing the discharge air at people, or over the water in
pool areas.
• If used near a pool or spa; be certain there is NO chance the unit
could fall into the water, be splashed and that it is plugged into a
GFI GROUND FAULT INTERRUPT OUTLET.
• DO NOT use the device as a bench or table.
• DO NOT place the device directly on structural members. Provide
vibration isolation in order to minimize operational vibration and/or
noise.
• A drain pan MUST be placed under the unit if installed above
a living area or above an area where water leakage could cause
damage
• If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified person in order
to avoid a hazard.
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Quest CDG 74 Installation, Operation and Maintenance Instructions
1. Specifications
Part No. 4034760
Power 5.5 amps, 110-120 VAC, Grounded
Water 75 pints/day @ AHAM (80°F, 60%)
Cord 25’ 14ga power cord
Process Air 150 CFM without external ducting
Refrigerant 1 lb, 4 oz. R410a
Charge
Operating 33°F to 110°F
Range
Filter 12” x 12” x 1” Pleated Media MERV-8
Duct
Options Outlet – 10” Lay-Flat
Warranty Five years;
1st year 100% of Parts and Labor
2nd-5th year 100% of Parts of sealed
refrigeration system.
Size 30” high x 20” wide x 17” deep
Weight 82 lbs
Patents 7,246,503
8,938,981
2. Operation
Place dehumidifier inside structure, place condensate hose into a drain, or a very large container, and turn on. To decrease
drying times, make sure all windows and doors are closed to the outside and seal o the wet area from any unaected
areas.
2.1 Transporting
The Quest CDG 74 features a high-impact roto-molded housing which protects the unit airways, and while loading into
vehicles. It is recommended the units are properly secured for transport. The Quest CDG 74 must always be upright
when transported by vehicle. It may be tipped onto its handle and back for loading and moving by hand.
2.2 Location
Note the following precautions when locating the Quest CDG 74:
• It is designed to be used INDOORS ONLY.
• If used in a wet area, plug it into a GROUND FAULT INTERRUPTER.
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Quest CDG 74 Installation, Operation and Maintenance Instructions
• DO NOT use the Quest CDG 74 as a bench or table.
• It must always be used in the upright position.
• The air inlet on top and the front outlet must be at least 1 foot from walls and other obstructions to air flow.
• If the humid area is very large, dehumidification can be improved by adding an outlet duct to circulate air to stagnant
areas (see Sec. 2.5).
2.3 Electrical Requirements
The Quest CDG 74 plugs into a common grounded outlet on a 15 amp circuit. It draws 5.5 amps at 80°F, 60% RH. If
used in a wet area, a ground fault interrupter (GFI) is required. If an extension cord is required, it must have a minimum
of 14 gauge conductors if 25 feet long or less and 12 gauge conductors if greater than 25 feet long.
2.4 Condensate Removal
The Quest CDG 74 is equipped with an internal condensate pump to remove the water that is condensed during
dehumidification. This allows the condensate to be pumped up to 20 feet with the attached hose. If the condensate must
be pumped more than 20 feet above the unit, a second pump must be added to relay the condensate. The condensate
pump automatically purges when the reservoir is full. Use the PURGE button to manually remove condensation.
2.5 Ducting
A wire duct collar is supplied to allow 10” lay-flat duct to be attached to the Quest CDG 74 outlet. Lay-flat plastic
ducting is available; see accessories table page 6. To attach ducting to the wire duct collar, put the plastic duct end
through the collar center and roll the duct end outward so that it overlaps the outside of the collar. The duct and collar
may then be quickly attached to the Quest CDG 74 by snapping the collar over the four exhaust tabs.
2.6 Defrost Cycle
If the low side refrigerant temperature drops due to excessive frost formation on the evaporator coil and below the
temperature set point, the thermistor activates the solid-state control and defrost light. The compressor is cycled o
and on by the thermistor temperature measurement. The air mover will continue to run, causing air to flow through the
evaporator coil and melt the ice when the compressor is o. When the air temperature and/or humidity increases, the
evaporator temperature will rise and the thermistor will end the defrost cycle at the temperature set point.
2.6 POWER Button
Press the POWER button to turn the dehumidifier on or o. When starting the dehumidifier the display will show the
accumulated hours. Press the POWER button again to turn the dehumidifier o. The display will also power o.
Quest CDG 74 control board.
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Quest CDG 74 Installation, Operation and Maintenance Instructions
2.8 Pump Purge Button
During normal operation the pump automatically cycles when the reservoir is full. Press the PURGE button to remove
condensate manually from the reservoir. There are several ways to manually remove water from the reservoir:
1. Press the PURGE button once and the pump will run for 20 seconds
2. Press and hold the PURGE button and the pump will run for up to 30 seconds
3. Press the PURGE button while the dehumidifier is powered o and the pump will run for 30 seconds.
Always manually purge the water reservoir before transport or storage. Turn o the power and allow the plugged in dehu-
midifier to rest 15 minutes before the final purge.
2.9 Hour Meter
The digital hour meter displays the amount of time the dehumidifier has been turned on to the tenth of an hour.The hour
meter continuously cycles between total machine hours and job hours every 3 seconds. Hours are stored in memory even
when the unit is unplugged.The previous totals will be displayed next time the unit is powered on.
2.10 HOURS Button
Pressing the HOURS button displays the hour meter when the unit is turned o but plugged into power. To reset job
hours, press and hold the HOURS button for 5 seconds when the unit is operating.
2.11 DEFROST Light
The DEFROST light turns on when the unit is in defrost cycle and indicates when the compressor is o.
3 Maintenance
3.1 Air Filter
The Quest CDG 74 is equipped with a pleated media air filter that must be checked regularly. The standard filter is a
MERV-8 high eciency filter. Operating the unit with a dirty filter will reduce the dehumidifier’s capacity and eciency
and may cause the compressor to cycle o and on unnecessarily. Quest recommends changing the filter with each grow
cycle.
IMPORTANT: DO NOT operate the unit without the filter or with a less eective filter as the coils inside the unit
could become clogged and require disassembly to clean.
3.2 Storage
There are three issues to consider when the Quest CDG 74 is stored between uses. The first two issues occur when water
trapped in the unit and condensate pump, and the third occurs when the unit is stored with a dirty filter. If standing water
is left in the unit, the condensate pump can be damaged when temperatures fall below freezing and/or biological growth
can occur. Biological growth can also be caused from storing the CDG 74 with a dirty filter.
The eect of the trapped water can be greatly reduced if precautions are taken to remove as much water as possible
before storage. In addition, biological growth can be prevented if the filter is replaced before storage.
To reduce the chance of damaging the condensate pump from water freezing:
1. Use the pump PURGE button to reduce the water level in
the reservoir.
2. Walk out the condensate to drain it completely.
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Quest CDG 74 Installation, Operation and Maintenance Instructions
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 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 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
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Quest CDG 74 Installation, Operation and Maintenance Instructions
4.2 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. Defrost thermistor defective or loose
3. Loose connection in compressor circuit
4. Defective compressor overload
5. Defective compressor
6. Defective relay
7. Upper housing is not sealed to lower housing
No dehumidification, air mover runs but compressor does not.
1. Bad connection in compressor circuit
2. Safety float switch closed, check pump reservoir
3. Defective compressor capacitor
4. Defective compressor overload
5. Defective compressor
6. Defective control board
Air mover does not run. Compressor runs briefly but cycles on and o.
1. Loose connection in blower circuit
2. Obstruction prevents impeller rotation
3. Defective air mover
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
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Quest CDG 74 Installation, Operation and Maintenance Instructions
4. Air filter dirty
5. Defective defrost thermistor
6. Low refrigerant charge
7. Defective compressor
8. Restrictive exhaust ducting
Unit runs but does not pump water.
1. Hose kinked or plugged
2. Pump motor defective
3. Pump check valve plugged
4. Bad connection in pump circuit
5. Hose disconnected internally
Unit pumps water automatically but not when PURGE button is pushed.
1. Bad connection in PURGE button circuit
2. Defective control board
Evaporator coil frosted continuously, low dehumidifying capacity.
1. Defrost thermistor loose or defective
2. Low refrigerant charge
3. Dirty air filter or restricted air flow
4. Front housing is not sealed to rear housing
Compressor runs with POWER button OFF.
1. Defective relay
2. Defective control board
4.3 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 front housing
3. Disconnect the impeller leads
4. Remove the four screws holding the impeller to the mounting plate
5. Reassemble the new impeller using the above procedure in reverse
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Quest CDG 74 Installation, Operation and Maintenance Instructions
4.4 Thermistor
The defrost thermistor is attached to the refrigerant suction line between the accumulator and the evaporator.
To replace thermistor:
1. Unplug the dehumidifier
2. Remove the front housing
3. Cut cable ties and remove insulation and aluminum tape.
4. Remove control panel
5. Unthread thermistor from control housing grommet
6. Detach thermistor from control board jumper
7. Reassemble thermistor and dehumidifier using the above procedure in reverse
4.5 Condensate Pump
The internal condensate pump removes water that collects in the
reservoir.
To replace the condensate pump:
1. Unplug the unit
2. Remove the front housing
3. Unplug the pump wires from the wire harness
4. Remove the condensate hose and the one screw attaching
the pump bracket to the rear housing
5. Replace the pump, hose, wiring, bolts, and housing in the
reverse order
Thermistor attached to the
refrigerant line.
4.6 Float Safety Switch
Picture of pump and reservoir.
The float safety switch activates when the water rises too high in the condensate reservoir. The float safety switch turns o the
compressor until the water level lowers and disengages the switch.
The internal condensate pump removes water that collects in the reservoir.
To replace the condensate pump:
1. Unplug the unit
2. Remove the front housing
3. Unplug the pump wires from the wire harness
4. Remove the condensate hose and the one screw attaching the pump bracket to the rear housing
5. Replace the pump, hose, wiring, bolts, and housing in the reverse order
5 Options & Accessories
4026315 Air Filter, Pleated 12” x 12” x 1” MERV-8
4025568 Air Filter, Pleated 12” x 12” x 1” MERV-11
4024935 Lay-Flat Duct 10” Round x 250’ Roll
To order, contact Therma-Stor LLC at 1-800-533-7533.
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Quest CDG 74 Installation, Operation and Maintenance Instructions
6 Wiring Diagram
PLUG
GRN-14
1 - LINE
2 - NEUT
3 - COMP
THERMISTOR
BLK-15
YEL-10
RED-9
WHT-7
WHT
BLK
WHT-2
WHT-7
COMPRESSOR
GRN
BLK-16
BLK-3
C
R
S
P/N 4031273 REV C
Figure 3: Electrical schematic of Quest CDG 74
5 4
PUMP
CONTROL
BLK-5
FAN
BOARD
LEVEL
SWITCH
RUN
CAP
YEL
YEL
WHT-6
FAN
MOTOR
BLU
YEL
GRN
BLU-8
WHT
BLK
GRN-13
BLK-4
NO
NC
FLOAT
BRN-12
RUN
CAP
BLK-11
BLK-5
SAFETY
PUMP
GRY
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7 Service Parts
Item Description Qty Part No.
1 Top Cover 1 4031258
2 Filter, 12” x 12” x 1” MERV 7 1 4026315
3 Impeller, Air Mover 1 4034477
4 Evaporator Coil 1 4031253
5 Condenser Coil 1 4031254
6 Condensate Pump 1 4034496
7 Capacitor, Compressor, 35 μF 1 4033032-03
8 Compressor 1 4030483
9 Thermistor Probe 1 4034716-02
10 Capacitor, Impeller, 6.0 μF 1 4033031-03
11 Hex Bolts, 1/4”–20 x 1.25” 6 1154012
12 Handle Bar 1 4031267
13 Handle Grip 1 4031268
Item Description Qty Part No.
14 Wheel, 12”, Black 2 4026851
15 Cotter Pin 2 1284404
16 Hub Cap, Wheel, Black 2 4027138
17 Handle Knob, Lanyard 2 4033372
18 Control Board 1 4034457
19 Power Cord, 25’ 14ga 1 4037569
Items listed are not shown
Item Description Qty Part No.
Hose (1/4” ID x 33’ long) 1 4024916
Coupling Body, 1/4” Tube 1 4024910
Coupling Insert, 1/4” Tube 1 4027277
Exhaust Grill 1 4026308
Wire Duct Collar 1 4026309
1
2
3
4
5
6
7
11
10
9
12
8
19
18
17
14 15
16
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Quest CDG 74 Installation, Operation and Maintenance Instructions
Quest CDG 74 Dehumidifier Limited Warranty
Warrantor:
Therma-Stor LLC
4201 Lien Rd
Madison, WI 53704
Telephone: 1-866-933-7486
Who Is Covered: This warranty extends only to the original end-user of the Quest CDG 74
dehumidifier, and may not be assigned or transferred.
Year One: Therma-Stor LLC warrants that, for one (1) year the Quest CDG 74 dehumidifier will operate free from any defects in
materials and workmanship, or Therma-Stor LLC will, at its option, repair or replace the defective part(s), free of any charge.
Year(s) Two Through Five: Therma-Stor LLC further warrants that for a period of five (5) years, the condenser, evaporator, and
compressor of the Quest CDG 74 dehumidifier will operate free of any defects in material or workmanship, or Therma-Stor LLC,
at its option, will repair or replace the defective part(s), provided that all labor and transportation charges for the part(s) shall be
borne by the end-user.
End-User Responsibilities: Warranty service must be performed by a Servicer authorized by Therma-Stor LLC. If the end-user
is unable to locate or obtain warranty service from an authorized Servicer, he should call Therma-Stor LLC at the above number
and ask for the Therma-Stor Service Department, which will then arrange for covered warranty service. Warranty service will be
performed during normal working hours.
The end-user must present proof of purchase (lease) upon request, by use of the warranty card or other reasonable and reliable
means. The end-user is responsible for normal care. This warranty does not cover any defect, malfunction, etc. resulting from
misuse, abuse, lack of normal care, corrosion, freezing, tampering, modification, unauthorized or improper repair or installation,
accident, acts of nature or any other cause beyond Therma-Stor LLC’s reasonable control.
Limitation and Exclusions: If any Quest CDG 74 Dehumidifier part is repaired or replaced, the new part shall be warranted for
only the remainder of the original warranty period applicable thereto (but all warranty periods will be extended by the period of
time, if any, that the Quest CDG 74 Dehumidifier is out of service while awaiting covered warranty service).
UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE Quest CDG 74 OR ANY PART
THEREOF, ALL OTHER WARRANTIES IMPLIED BY LAW, INCLUDING MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, SHALL ALSO EXPIRE. ALL WARRANTIES MADE BY THERMA-STOR LLC ARE SET FORTH
HEREIN, AND NO CLAIM MAY BE MADE AGAINST THERMA-STOR LLC BASED ON ANY ORAL WARRANTY. IN
NO EVENT SHALL THERMA-STOR LLC, IN CONNECTION WITH THE SALE, INSTALLATION, USE, REPAIR OR
REPLACEMENT OF ANY Quest CDG 74 OR PART THEREOF BE LIABLE UNDER ANY LEGAL THEORY FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES INCLUDING WITHOUT LIMITATION WATER DAMAGE
(THE END-USER SHOULD TAKE PRECAUTIONS AGAINST SAME), LOST PROFITS, DELAY, OR LOSS OF USE OR
DAMAGE TO ANY REAL OR PERSONAL PROPERTY.
Some states do not allow limitations on how long an implied warranty lasts, and some do not allow the exclusion or limitation of
incidental or consequential damages, so one or both of these limitations may not apply to you.
Legal Rights: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
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