Quest Engineering 155 Manual

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.
Quest Dry
Installation, Operation and Maintenance Instructions
4201 Lien Rd Phone [phone]
Madison, WI 53704 Toll-Free 1-877-420-1330
www.QuestClimate.com [email protected]
– Read and Save These Instructions –
Specifications subject to change without notice. 1TS-1052
05/18 Rev. B
50HzQuest 155
50Hz Quest 155:
• Industry-leading efficiency
• Patented, optimized air-to-air heat exchanger
• High-efficiency, long-life impeller fan
• MERV-13 filtration
• Auto-restart after power outages
• Low voltage control
Water Removal Rates Per Day @ 26.7°C (80°F) 60% (AHAM)
Dehumidifier Liters Pints/Gallons
Quest 155 71 150/18.7

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Table of Contents
Safety Precautions....................................................................3
1. Intended Application(s).........................................................4
2. Registration ........................................................................4
3. Specifications ....................................................................4
4 . Installation ........................................................................5
4.1 Location ........................................................................5
4.2 Electrical Requirements............................................... 5
4.3 Condensate Water Removal........................................6
4.4 Hanging Diagram .........................................................6
4.5 Ducting ........................................................................ 7
4.5A. Supply Duct Kit (P/N 4028607).................. 7
4.5B Return Duct Kit (P/N 4028610)................... 7
5. Control Options.................................................................... 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
7. Service ........................................................................9
7.1 Warranty ........................................................................9
7.2 Technical Description ...................................................9
7.3 Troubleshooting........................................................... 10
7.4 Refrigerant Charging....................................................11
7.5 Impeller Fan Replacement...........................................11
7.6 Compressor/Capacitor Replacement ........................12
7.6A Checking Compressor Motor Circuits...........12
7.6B Replacing a Burned out Compressor..............12
7.6C Replacing a Compressor, Nonburn Out........13
7.7 Remote Controls..........................................................13
7.7A Humidity Control............................................ 14
7.8 Defrost Thermostat.................................................... 14
7.9 Condensate Pump Kit ................................................ 14
8. Wiring Diagram....................................................................15
9. Service Parts List .................................................................16
Warranty .......................................................................18

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50Hz Quest 155 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 155 indoor air quality system.
READ AND SAVE THESE INSTRUCTIONS
• 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 a similarly qualified
person in order to avoid a hazard.
• Do not unplug the unit by pulling on the cord. Grasp the plug firmly and pull it out
of the wall socket or power receptacle.
• When plugging in the unit, use a Ground Fault Interrupter outlet.
• This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience or knowledge,
unless they have been given supervision or instruction concerning the 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.
• Never operate electrical equipment near or in standing water.
• Do not stick your fingers or other objects through the safety grill.
• The unit must be used in the upright position.
• When changing filters, do not stick fingers or other objects in the unit.
• Do not restrict airflow in to or out of the unit. This may cause the unit to overheat.
• The unit should never be serviced or cleaned while it is plugged in.
• Do not sit or stand on the unit, or use as a shelf or table.
• Before leaving the unit unattended, ensure children do not have access to the
equipment. Do not allow children to play with or near the unit or in its air flow.
• The unit is designed to be installed indoors only.
• No user serviceable components. Contact installer or call 1-877-420-1330 for all
repair or warranty needs.

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1. Intended Application for Quest 155
The Quest 155 is designed to operate in temperatures between 5°C and 35°C.
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 155, water intrusion and air infiltration
problems should be addressed.
2. Registrations
The Quest 155 conforms to CE standards.
3. Specifications @ 26.7°C/60% RH
4037400-XX Quest 155
Blower: 415 CFM @ 0.0" WG
Power: (Watts) 800
Supply voltage: 230 VAC - 1 Phase - 50 Hz.
Current Draw: (Amps) 3.5
Energy Factor: (L/kWh) 3.74
Operating Temp: 5°C Min - 35°C Max
Water Removal: (L/Day) 71
Air Filter: MERV-13 Size: 41cm x 51cm x 5cm
Drain Connection: 3/4” Threaded NPT
Refrigeration Type:
Refrigerant Amount:
R410A
2 lbs, 1 oz
Dimensions:
Width:
Height:
Length:
Weight:
Unit
96cm
56cm
51cm
61 kg
Power Cord: 20’ Fem IEC 60320-C13
4037400-01 UK Cord
BS 1363 (type G)
4037400-02 AUS Cord
AS 3112 (type I)
4037400-03 EU Cord
CEE 7/7 (type E and F)

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4. Installation
Caution! Remove compressor shipping tie from the unit. Failure to remove shipping tie will cause
excess vibration to be transmitted to the frame.
4.1 Location
The Quest 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 Dehumidifier as a bench or table.
• DO NOT place the Quest 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 Dehumidifier on supports that raise the base of the unit 7cm above the top of the flanges on the
drain pan beneath it. Raising the Quest Dehumidifier will help the unit drain with gravity flow. Do not place the Quest
Dehumidifier directly on structural building members without vibration absorbers or unwanted noise may result.
The Quest 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 Dehumidifier plugs into IEC 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
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 Dehumidifier and the remote control panel.
The remote controls of the Quest 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
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 7cm
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 7cm o the ground. Then
coil the drain hose under itself or position a spacer to lift the hose 3cm” 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. Contact your
dealer, call 1-877-420-1330, or go to www.questhydro.com/product-category/accessories to order.
4.5B Return Duct Kit (P/N 4028610)
A factory designed return duct kit can be purchased to accept 12” ducting. Contact your dealer, call 1-877-420-1330, or
go to www.questhydro.com/product-category/accessories to order.
5. Control Options
The Quest 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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50Hz Quest 155 Installation, Operation and Maintenance Instructions
8www.QuestClimate.com
[email protected]
5.2 External Control
The Quest 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 turned all the way to “Humid”
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 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, call 1-877-420-1330, or go to www.questhydro.com/product-category/accessories to order.
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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
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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50Hz Quest 155 Installation, Operation and Maintenance Instructions
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4020175
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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.
The Quest Dehumidifier ships with a standard MERV 13 ecient pleated fabric filter. 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 Dehumidifier. The filter should be readily
visible and can be removed by pulling it straight out of the Quest Dehumidifier.
At minimum we recommend changing the filter every 3 to 6 months.
7. Service
WARNING! Servicing the Quest 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: 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.
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.
7.2 Technical Description
The Quest 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.

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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 expansion device 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.
Low dehumidification capacity (evaporator is frosted continuously). Dehumidification is being called for
1. Defrost thermostat loose or defective.
2. Low refrigerant charge