Quest PowerDry 4000 ProInstallation, 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 benet from your
Quest PowerDry 4000 Pro.
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
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
1. Specications
Part No. 4031120
Power 10 amps, 115 Vac, Grounded
Water 176 pints/day @ AHAM 80°F, 60% RH
Removal
Blower 380 CFM without external ducting
Refrigerant 2 lbs., 2 oz. R410a
Charge
Operating 33°F to 105°F
Range
Filters: 15.5” x 19.5” x 1.75” Pleated Media MERV-11
Warranty Five years;
1st year 100% of Parts and Labor
2nd-5th year 100% of Parts of sealed
refrigeration system.
Dimensions Width 20”, Depth 23”, Height 40”
Weight 135 lbs.
2. Operation
Place dehumidier 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 off the wet
area from any unaffected areas.
2.1 Transporting
The Quest PowerDry 4000 Pro must always be upright when transported by vehicle. It may be tipped on to
its handle and back for loading and moving by hand.
2.2 Location
Note the following precautions when locating the Quest PowerDry 4000 Pro:
• It is designed to be used INDOORS ONLY.
• If used in a wet area, plug it into a GROUND FAULT INTERRUPTER.
• DO NOT use the Quest PowerDry 4000 Pro as a bench or table.
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
• 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
ow.
• If the humid area is very large, dehumidication can be improved by adding an outlet duct to circulate air
to stagnant areas (see Sec. 2.5).
2.3 Electrical Requirements
The Quest PowerDry 4000 Pro can be plugged into a grounded 15 Amp circuit. At 80°F, 60% RH, it draws
10 Amps. Due to the high percentage of a 15 Amp circuit’s capacity that the unit uses, the circuit should be
dedicated to running it only. Amp draw decreases at lower loads and increases at higher loads. At extremely
high loads, a 20 Amp circuit may be required.
If an extension cord is required, it must have a minimum of 12 gauge conductors if 25 feet long or less and
10 gauge conductors if greater than 25 feet long.
2.4 Condensate Removal
The Quest PowerDry 4000 Pro is equipped with an internal condensate pump to remove the water that is
condensed during dehumidication. This allows the condensate to be pumped 30’ 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.
2.5 Ducting
A detachable rectangular exhaust collar is supplied that will allow 10” round lay-at duct to be attached to
the Quest PowerDry 4000 Pro outlet.
To attach ducting to a 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
PowerDry 4000 Pro by snapping the collar over the four screws at the blower outlet.
2.6 Power Button
Press the POWER button to turn the dehumidier on or off. When starting the dehumidier the display will
show the accumulated hours. Press the POWER button again to turn the dehumidier off. The display will
also power off.
2.7 Pump Purge Button
During normal operation the pump automatically cycles every four minutes. 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 dehumidier is powered off and the pump will run for 30 seconds.
Always manually purge the water reservoir before transport or storage. Turn off the power and allow the
plugged in dehumidier to rest 15 minutes before the nal purge.
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
2.8 Humidistat
Adjust the humidistat to the desired conditioned humidity. The humidistat has a range of 20% to 70% RH.
“ON” will operate the unit continuously regardless of humidity.
2.9 Hours Button
Pressing the HOURS button displays the hour meter when the unit is turned off but plugged into power. To
reset job hours, press and hold the HOURS button for 5 seconds when the unit is operating.
2.10 Defrost Light
The DEFROST light turns on when the unit is in defrost mode indicating when the compressor is off.
DRYING TIP: Air’s ability to absorb moisture from wet surroundings and the Quest PowerDry 4000 Pro’s
ability to remove moisture from that air is greatly improved at higher temperatures. We recommend that
the area to be dried be heated to over 70°F if possible. Less drying time will be required and efciency will
improve.
2.11 Defrost Cycle
If the evaporator coil’s refrigerant temperature drops below the defrost set point, due to excessive frost
formation, the thermistor activates the solid state control and the defrost light. The control cycles the
compressor “off” and “on” by monitoring thermistor temperature. The air mover will continue to run,
causing air to ow through the evaporator coil. The air will melt the ice that formed on the evaprator.
When the air temperature and/or humidity increases, the evaporator temperature will rise and the thermistor
will end the defrost cycle restarting the compressor.
If the evaporator temperature does not reach the desired temperature, the compressor will start after 15
minutes. The system will start a timed defrost cycle. The timed defrost cycle ensures the unit will continue
to remove water from the air in cool ambient conditions.
2.12 Low Pressure Control
If the low side refrigerant drops into a low pressure situation that may harm the compressor, the solid state
controls will sense the refrigerant conditions and shut off the compressor until the system automatically resets
itself.
The solid state control monitors the refrigerant conditions to ensure the system is protecting compressor
at all times. The control protects the compressor from damage by monitoring cycles, pressures, and system
performance.
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
3 Maintenance
3.1 Air Filter
The Quest PowerDry 4000 Pro is equipped with a pleated fabric air lter that must be checked regularly.
The standard lter is a MERV-11 high efciency lter. Operating the unit with a dirty lter will reduce the
dehumidier’s capacity and efciency and may cause the compressor to cycle off and on unnecessarily on
the defrost control.
IMPORTANT: DO NOT operate the unit without the lter or with a less effective lter as the heat exchanger
and coils inside the unit could become clogged and require disassembly to clean.
3.2 Storage
There are two issues to consider when the Quest PowerDry 4000 Pro is stored between uses and both
pertain to the water trapped in the unit: damage caused by freezing and biological growth. The effect of the
trapped water can be greatly reduced if precautions are taken to remove as much as possible before storage.
1. Use the pump purge switch (see Sec. 2.7 and Fig. 4) to reduce the water level in the reservoir.
2. Stretch the hose at to drain it completely.
If the unit will not be exposed to freezing temperatures, an alternative way to reduce biological growth is
to ush the unit with a bio-fungicide that is approved for use with copper, aluminum and polyethylene. To
ush:
1. Run the hose to a drain.
2. Plug in the unit but do not turn it on.
3. Remove the air lter. Slowly pour a quart of the chemical through the top grille so that it drains into the
black plastic slots.
4. Hold in the pump purge switch to reduce the water level in the reservoir.
5. Flush with water.
4 Service
CAUTION: Servicing the Quest PowerDry 4000 Pro with its high pressure refrigerant system and high
voltage circuitry presents a health hazard that could result in death, serious bodily injury, and/or property
damage. Only qualied service people should service this unit.
4.1 Warranty
A warranty certicate has been enclosed with this unit; read it before any repair is initiated.
If a warranty repair is required, call the factory rst at 1-800-533-7533 for warranty claim authorization and
technical assistance.
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
4.2 Technical Description
The Quest PowerDry 4000 Pro 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 (see Fig. 2).
Hot, high pressure refrigerant gas is routed from the compressor to the condenser coil (see Figure 2). 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 lter/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 ooded condition, which means that all the evaporator tubes contain liquid refrigerant
during normal operation. A ooded 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 dehumidication, 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 dehumidication, neither hour meter display nor compressor run with POWER button ON.
1. Defective control board
2. Loose connection in internal wiring
Some dehumidication, 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 dehumidication, air mover runs but compressor
does not.
1. Bad connection in compressor circuit
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Figure 2: Refrigeration system of Quest
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
2. Check to make sure humidistat is set high enough
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 lter
2. Remove 5 screws holding front lter bracket
3. Remove the lter 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
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
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
4.8 Gravity Drain Option
If the condensate pump fails and cannot be replaced immediately, the Quest PowerDry 4000 Pro can be used by
draining by gravity.
1. Unplug the unit and remove the front cover.
2. Push the plastic plug on the right side (see Fig. 4) out from inside the unit.
3. Locate the heavy vinyl hose that connects the drain pan to the condensate pump. Pull the end out of the pump.
4. Remove tie wrap holding drain tube to suction line.
5. Push that end of the vinyl hose through the hole in the right side.
6. Connect a garden hose and run it to a drain. Keep the hose as at to the oor as possible to avoid air pockets that
would hinder draining. Placing the unit on something above the oor will also improve draining.
5. Wiring Diagram
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
4.00
REVISION "A" CHANGES
- RELEASED FOR PRODUCTION
WHT-22
BLK-4
BLK 5
BLK-10
RELAY
0
4
6
1
BLK-16
THERMISTOR
YEL-9,17
COMPRESSOR
BRN-15
BLK-11
C
WHT-2
S
R
WHT-21
WHT-14
GRY-6
FLOAT
WHT-2,7
YEL-12
WHT-7
RED-13
BLU-8
4031125
BLK-4
BLK-5
GRY-6
COMP
FAN
PURGE
(3)
(4)
(5)
DEHUMIDSTAT
WHT-22
HIGH PRESSURE
SWITCH
VIO-3
BLK-1
COMP.
RELAY
WHT-21
WHT-2
WHT-23
LINE (1)
NEUT. (2)
WHT-7
BLK-10
0
4
BLK-11
6
1
LOW PRESSURE
SWITCH
EVAP
WHT.-14
THERMISTOR
LEVEL
YEL-9,17
COMP.
CAP
C
COMPRESSOR
RED-13
BLU-8
YEL-12
S
R
Figure 3: Electrical schematic of Quest PowerDry 4000 Pro
BLK
GRY
BLU
BRN-15
IMP.
CAP
PUMP
YEL
IMPELLER
BLK-1,10
BLK-16
BLK-1
(1)
LINE
COMP (3)
VIO (3)
WHT-23
PURGE (5)
AMBIENT
ACTUATOR
(2)
NEU.
FAN (4)
EVAP
LEVEL
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
6 Service Parts
Item Description Qty Part No.
1 Top Cover 1 4028583
2 Top Cover Hinge 2 4027267
3 Wheel 12” Gray 2 4026304
4 Cotter Pin 3/32” 2 1284404
5 Air Filter 1.75 x 15.5 x 19.5 1 4021475
6 Hose Vinyl 0.56 ID x 24 1 4029894
7 Hose Vinyl 0.38 ID 1 4021909
8 Hose Vinyl 0.25ID x 33 1 4024916
9 Coupling Body 0.25 Tube 1 4024910
10 Coupling Insert 0.38 Tube 1 4023080
11 Control Board 1 4033674
12 Capacitor Compressor55mfd 370V 1 4029606
13 Capacitor Impeller 15mfd 371V1 4033031-07
14 Thermistor 1 4032644
15 Cord 1 4032315
Item Description Qty Part No.
19 Condenser Coil 1 4028566
20 Condensate Pump 1 4023649
21 Fan Motorized Impeller 1 4026657
22 Inlet Ring 1 4028564
23 Wire Duct Collar 1 4028593
24 Relay SPST 100/120V 25A 1 1970010
25 Filter Drier (not shown) 1 4029510
26 Wire Harness (not shown) 1 4031121
27 Handle 1 4026094
28 Bolt M10-1.5 X 35 2 1177792
29 Washer M10 X 30 2 4025517
30 Hex Lock Nut M10-1.5 2 1223780
31 Humidity Controller 1 4027172
32 Knob 1 4021495
16 Compressor 11.9KBTU R410a1 4029186
17 Overload Compressor 1 4029177
18 Evaporator Coil 1 4028565
2
18
19
12
6
24
13
23
14
20
16, 17
21, 22
15
31, 32
1, 5, 8
27, 28
29, 30
11
7, 9, 10
3, 4
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Figure 4
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Quest PowerDry 4000 ProInstallation, Operation and Maintenance Instructions
Quest PowerDry 4000 Pro Dehumidier 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 PowerDry 4000 Pro
dehumidier, and may not be assigned or transferred.
Year One: Therma-Stor LLC warrants that, for one (1) year the Quest PowerDry 4000 Pro dehumidier 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 ve (5) years, the condenser,
evaporator, and compressor of the Quest PowerDry 4000 Pro dehumidier 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, modication,
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 PowerDry 4000 Pro Dehumidier 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 PowerDry 4000 Pro Dehumidier is out of service while
awaiting covered warranty service).
UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE Quest PowerDry 4000 Pro 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 PowerDry 4000 Pro 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 specic legal rights, and you may also have other rights which vary from state to
state.
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