Quest Engineering 105 Dual Manual

Quest 215 Dual
Quest Dry
Quest 105, 155, 205 and 225 Dual
Installation, Operation and Maintenance 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.
Installation, Operation and Maintenance Instructions
4201 Lien Rd
Madison, WI 53704 Toll-Free 1-877-420-1330
www.QuestHydro.com [e-mail]
– Read and Save These Instructions –
Specifications subject to change without notice. 1
Water Removal Rates (Pints/Day) @ 80°F 60% (AHAM)
Dehumidifier Pints Removed Gallons/Liters
105 Dual 105 13.1/49.7
155 Dual 155 19.4/73.3
205 Dual 205 25.6/97.0
225 Dual 225 28.1/106.5
PATENTS:
D570,988
8,069,681
9,052,132
Features:
• Industry-leading efficiency, most efficient on the market
today
• Patented, optimized air-to-air heat exchanger
• High-efficiency, long-life impeller fan
• Quiet operation
• Superior air filtration (MERV-11 standard)
• Auto-restart after power outages
• Environmentally friendly R410A refrigerant
• Low voltage control
TS-999
12/17 Rev. B

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Table of Contents
Safety Precautions.................................................................... 3
1. Intended Application.............................................................4
2. Registrations ........................................................................4
3. Specifications .......................................................................4
4. Installation ........................................................................ 5
4.1 Location ........................................................................ 5
4.2 Electrical Requirements............................................... 5
4.3 Condensate Removal ................................................... 6
4.4 Install Diagram.............................................................. 6
4.5 Ducting ........................................................................ 7
4.5A Supply Duct Kit ................................................ 7
4.5B Return Duct Kit ................................................ 7
5. Controls ........................................................................ 7
5.1 On board dehumidistat ................................................. 7
5.2 External Control ...........................................................8
5.2A Deh 3000R ......................................................8
5.2B Honeywell Remote Humidistat....................... 9
6. Maintenance ........................................................................ 9
6.1 Standard Air Filter......................................................... 9
6.2 Impeller Fan Oiling....................................................... 9
7. Service ........................................................................ 9
7.1 Warranty ........................................................................9
7.2 Technical description................................................... 10
7.3 Troubleshooting........................................................... 10
7.4 Refrigerant Charging ..................................................12
7.5 Impeller Fan Replacement .........................................12
7.6 Compressor/Capacitor Replacement ........................12
7.6A Checking Compressor Motor Circuits ..........12
7.6B Replacing Burned Out Compressor ..............13
7.6C Replacing Compressor-Nonburn Out...........13
7.7 Remote Controls..........................................................13
7.7A Humidity Control............................................ 14
7.7B Programable Ventilation Timer....................... 14
7.8 Defrost Thermostat .................................................... 14
7.9 Electric Ventilation Damper...................................... 14
7.10 Condensate Pump Kit................................................15
Wiring Diagram .......................................................................16
Service Parts List .....................................................................17
Optional Parts List ..................................................................17
Warranty .......................................................................18

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Quest 105/155/205/225 Dual Installation, Operation and Maintenance Instructions
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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 Dual Dehumidifier.
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, spa or water; be certain there is NO chance the unit
could fall into the water, be splashed and that it is plugged into an outlet
that is a GROUND FAULT INTERRUPT protected circuit.
• 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
• Never operate a unit with a damaged power cord. If the power cord is
damaged it must be replaced by the manufacturer, its service agent, or
similarly qualified person in order to avoid a hazard.
• Make all electrical connections in accordance with the current edition of
the NEC ANSI/NFPA 70 and any national and local codes or ordinances
that may apply.
• Do not obstruct the air intake and exhaust. Maintain a .3 m (1 ft)
clearance around the air intake and exhaust.
• This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience
and knowledge, unless they have been given supervision or instruction
concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the
appliance.

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1. Intended Application for Quest Dual Dehumidifier
The Quest Dual Dehumidifier is designed to operate in temperatures between 56° and 95°F.
In order to eciently control humidity levels, the area in which the dehumidifier is to be operated must be free of water
intrusion or excessive fresh (outside) air infiltration. Before installing the Quest Dual Dehumidifier, water intrusion and
air infiltration problems should be addressed or noted in calculations.
2. Registrations
The Quest Dual Dehumidifier units conform to unified standard UL 60335-2-40.
3. Specifications @ 80°F/60% RH
Unit: 4032270 105 Dual 4031490 155 Dual 4033060 205 Dual 4035400 225 Dual
Power (Watts): 530 920 1525 1500
Supply voltage: 110-120 VAC -
1 Phase - 60 Hz.
110-120 VAC -
1 Phase - 60 Hz.
110-120 VAC -
1 Phase - 60 Hz.
208-240 VAC -
1 Phase - 60 Hz.
Current Draw (Amps): 4.9 8.0 13.2 6.9
Energy Factor
(L/kWh): 4.2 3.5 2.7 2.9
Operating Temp: 56°F Min - 95°F Max 56°F Min - 95°F Max 56°F Min - 95°F Max 56°F Min - 95°F Max
Water Removal (Pints/Day):
Eciency (Pints/kWh):
105
8.8
155
7.3
205
5.7
225
6.1
Air Filter (MERV-11): Size: 16" x 20" x 2" Size: 16" x 20" x 2" Size: 16" x 20" x 2" Size: 16" x 20" x 2"
Power Cord:
*This unit requires a
dedicated 20A circuit
Drain Connection: 3/4” Threaded NPT 3/4” Threaded NPT 3/4” Threaded NPT 3/4 Threaded NPT
Refrigerant Type:
Refrigerant Amount:
R410A
1lb. 10oz.
R410A
1lb. 13oz.
R410A
2lb. 0oz.
R410A
2lb. 0oz.
Dimensions:
Width:
Height:
Length:
Weight:
Unit Shipping
20.25" 25"
21.75" 29"
37.88" 42"
140 lbs 160 lbs
Unit Shipping
20.25" 25"
21.75" 29"
37.88" 42"
140 lbs 160 lbs
Unit Shipping
20.25" 25"
21.75" 29"
37.88" 42"
150 lbs 170 lbs
Unit Shipping
20.25” 25”
21.75” 29”
37.88“ 42”
160 lbs 180 lbs
14ga 10’, NEMA 5-15P 14ga 10’, NEMA 5-15P 14ga 10’, NEMA 6-15P14ga 10’, NEMA 5-20P

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Quest 105/155/205/225 Dual Installation, Operation and Maintenance Instructions
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4. Installation
4.1 Location
The Quest Dual Dehumidifier can be installed in a variety of locations to meet the owner’s needs as listed below. In all
cases keep the following cautions in mind:
• It 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 and side panels for maintenance and service and also to allow easy
access to the filter cover panel. DO NOT INSTALL UNIT WITH THE FRONT PANEL OR FILTER COVER
PANEL INACCESSIBLE.
• Avoid discharging the air directly at people, or over the water in pool areas.
• Be certain there is NO chance the unit could fall into water or be splashed and that it is plugged into a GROUND
FAULT INTERRUPTER.
• DO NOT use the Quest Dual Dehumidifier as a bench or table.
• DO NOT place the Quest Dual Dehumidifier 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 an area where water leakage could
cause damage.
Place the Quest Dual Dehumidifier on supports that raise the base of the unit 2.5” above the top of the flanges on the
drain pan beneath it. Raising the Quest Dual Dehumidifier will help the unit drain with gravity flow. Do not place the
Quest Dual Dehumidifier directly on structural building members without vibration absorbers or unwanted noise may
result.
The Quest Dual Dehumidifier may be suspended with steel hanger straps or a suitable alternative from structural
members, unit must be supported from underneath. Don’t hang from sides or ends. Remember to place a drain pan
under the unit if it is suspended above a finished area or above an area where water leakage could cause damage. See
section 4.4
4.2 Electrical Requirements
The Quest Dual Dehumidifier plugs into NEMA rated Receptacles. The amp draws for each unit under normal operating
conditions are listed on page 4. A ground fault interrupter protected circuit is required.
Install the remote control panel in a central area of the structure where it will sense the relative humidity of the structure
accurately. Do not install the control panel where it may not accurately sense the relative humidity such as near HVAC
supply registers, near exterior doors, or near a pool or spa. The installer must supply the wiring between the Quest Dual
Dehumidifier and the control panel. Be sure to safely route the control wiring to prevent damage during installation. Be
careful not to cross the wires when connecting the Quest Dual Dehumidifier and the remote control panel.
The remote controls of the Quest Dual Dehumidifier are powered by a low voltage circuit (24 VAC) and must NEVER
contact or be connected to a high voltage circuit. The control terminals and remote control are labeled and numbered to
prevent confusion. Be sure to consult the electrical schematic in this manual or inside the access panel of the Quest Dual
Dehumidifier before making the control connections.

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CAUTION! For proper drainage, the unit must be mounted so the drain outlet is at least 4”
above the floor drain, and must be fully supported under the base.
4.3 Condensate Water Removal
Condensate drains by gravity via the drain port. Use 3/4” male NPT PVC pipe. Route drain pipe to drain. Install a trap if
possible. Take care when installing drain pipe to drain port. Use an adjustable wrench to secure the drain port. An optional
condensate pump kit may be installed if a lift is required to dispose of the condensate. The condensate pump kit can be
ordered directly from the factory. See the optional parts list for information on the kit.
When installing the drain hose make sure the feet are extended such that the dehumidifier is 2 1/2” othe ground.
Then coil the drain hose under itself or position a spacer to lift the hose 1” othe ground after the hose has touched the
ground. This procedure will create a trap that ensures your unit drains correctly. See the diagram below for further visual
clarification.
4.4 Hanging Diagram
Bottom view of
unit and bracket
Bracket (4036668)
Opt.1 Opt.2

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4.5 Ducting
4.5A Supply Duct Kit (P/N 4028607)
A factory designed supply duct kit can be purchased to accept 10” ducting to both outlets of the Quest Dual. Contact
your dealer or call 1-877-420-1330 to order or go to www.questhydro.com/product-category/accessories.
4.5B Return Duct Kit (P/N 4028610)
A factory designed return duct kit can be purchased to accept 12” ducting. Contact your dealer or call 1-877-420-1330
to order or go to www.questhydro.com/product-category/accessories.
5. Control Options
The Quest Dual Dehumidifier can be controlled by its on board dehumidistat or with an external control using its low
voltage terminal block.
5.1 On board dehumidistat
The humidity control is an adjustable switch that closes when the relative humidity of the air in which it is located rises to
the dial set point. It opens when the RH drops 4 to 6% below the set point.
Approximate Humidity Levels Per Setting
“Dry” 20% to 30% Relative Humidity
“Normal” 50% Relative Humidity (Recommended)
“Humid” 80% to 90% Relative Humidity
The dehumidifier will run until the relative humidity (RH) is reduced to the humidity control dial setting.
4037356

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Quest 105/155/205/ 225 Dual Installation, Operation and Maintenance Instructions
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5.2 External Control
The Quest Dual Dehumidifier is controlled using five terminals.
COM = 24volt AC power transformer neutral side (common with white)
FAN = Fan control
24V = transformer high side
DEHU = Dehumidification (fan and compressor) control
DMPR = 24volt AC power transformer neutral side (common with red)
* On board dehumidistat must be set to o
Between the COM/DMPR lead and the 24V leads is a 40VA transformer. This low voltage power source powers the
relay coils which control the fan and compressors. This 24VAC transformer can also be used to power HVAC assessories
external to the dehumidifier.
• To turn the dehumidifier on make contact between 24V and DEHU terminals, or turn the dehumidistat
clockwise towards drier.
• To turn the fan on make contact between 24V and FAN terminals.
• To power a 24V HVAC accessory, connect the accessory to the COM terminal and the 24V terminal.
NOTE: 18 ga wire needed between the Quest Dual dehumidifier and the external control
Quest oers two external control options
5.2A DEH 3000R
NOTE: 22 ga wire needed for sensor
Contact your dealer or call 1-877-420-1330 to order or go to www.questhydro.com/product-category/accessories.
COM
FAN
24V
DEHU
*
DMPR
24VAC
COMP FAN
HONEYWELL REMOTE HUMIDISTAT
QUEST DEH 3000R CONTROL
WIRING DIAGRAM
4028531 Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6
COM
FAN
24V
DEHU
*
DMPR
White Blue Yellow Green Red
COM
FAN
24V
DEHU
*
DMPR
COM
FAN
24V
DEHU
*
DMPR
COM
FAN
24V
DEHU
*
DMPR
COM
FAN
24V
DEHU
*
DMPR
COM
FAN
24V
DEHU
*
DMPR
COM
FAN
24V
DEHU
*
DMPR
* NOTE: Best quality if printed in color

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Quest 105/155/205/225 Dual Installation, Operation and Maintenance Instructions
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4020175
I
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H
U
M
I
D
N
O
R
M
A
L
D
R
I
E
R
OFFON
BEFORE TURNING ON UNIT:
1. CUT AND REMOVE ZIP TIE
2. PLUG HOLES USING
INCLUDED PLUGS
COM
FAN
24V
DEHU
*
DMPR
COM
FAN
24V
DEHU
*
DMPR
24VAC
COMP FAN
HONEYWELL REMOTE HUMIDISTAT
WIRING DIAGRAM
QUEST DEH 3000R CONTROL
WIRING DIAGRAM
5.2B Honeywell Remote Humidistat
6. Maintenance
WARNING! NOTE: Do not operate the unit without the filter or with a less eective filter.
The heat exchange coils inside the unit could become clogged and require disassembly to clean.
Filter non-compliance invalidates the product warranty.
6.1 Standard Air Filter
The Quest Dual Dehumidifier ships with a standard MERV 11 ecient pleated fabric filter. This filter should be checked
every six months. Operating the unit with a dirty filter will reduce dehumidifier capacity and eciency and may cause the
compressor to cycle oand on unnecessarily on the defrost control.
To access the air filter, remove the filter access panel from the end of the Quest Dual Dehumidifier. The filter should be
readily visible and can be removed by pulling it straight out of the Quest Dual Dehumidifier.
We recommend changing the filter at least with every grow cycle.
6.2 Impeller Fan Oiling
The impeller fan motor is factory lubricated for many years of normal operation, and no further oiling is required.
7. Service
WARNING! Servicing the Quest Dual 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.
7.1 Warranty
A warranty certificate has been enclosed with this unit; read it before any repair is initiated. If a warranty repair is
required, call the factory first at 1-877-420-1330 for warranty claim authorization and technical assistance.

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7.2 Technical Description
The Quest Dual Dehumidifier uses a refrigeration system similar to an air conditioner's to remove heat and moisture from
incoming air, and 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 causes 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 nearly 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.
7.3 Troubleshooting
Neither fan nor compressor running. Dehumidification is being called for. No fan call.
1. Unit unplugged or no power to outlet.
2. Humidity control set too high.
3. Loose connection in internal or control wiring.
4. Defective Compressor relay.
5. Defective control transformer.
Compressor is not running. Dehumidification is being called for. No fan call.
1. Defective compressor run capacitor.
2. Loose connection in compressor circuit.
3. Defective compressor overload.
4. Defective compressor.
5. Defrost thermostat open.
Compressor cycles on and o. Dehumidification is being called for. No fan call.
1. Low ambient temperature and/or humidity causing unit to cycle through defrost mode.
2. Defective compressor overload.
3. Defective compressor.
4. Defrost thermostat defective.
5. Dirty air filter(s) or air flow restricted.
Fan is not running. Dehumidification or fan is being called for.
1. Loose connection in fan circuit.
2. Obstruction prevents fan impeller rotation.
3. Defective fan.
4. Defective fan relay.