thermastor Quest 185 Cool Manual

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
11
P/N: 4033180 Serial No.: Install Date:
Sold by:
HVAC Installer: Please Leave Manual for Homeowner
INSTALLATION BY A HVAC PROFESSIONAL IS RECOMMENDED
Installation, Operation and Maintenance Instructions
Installation, Operation and Maintenance Instructions
4201 Lien Rd Phone [phone]
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. TS-961
03/17 Rev. C
Quest 185 Cool
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.
Water Removal Rates (Pints/Day) @ 80°F 60% (AHAM)
Dehumidifier Pints Removed Gallons/Liters
185 Cool 184 23.0/87.2
Features:
• 4,300 BTU Cooling
• Industry-leading efficiency
• 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

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
2www.QuestHydro.com
[e-mail]
Safety Instructions.........................................................................................................3
1. Intended Application for Quest 185 Cool Dehumidifier............................................4
2. Registrations...................................................................................................................4
3. Parts List Included .........................................................................................................4
4. Specifications .................................................................................................................4
5. Installation ......................................................................................................................5
5.1 Dehumidifier Setup.................................................................................................5
5.1 A Location..........................................................................................................5
5.1 B Electrical Requirements................................................................................6
5.1 C Condensate Water Removal ........................................................................6
5.1 D Hanging Diagram .......................................................................................... 7
5.1 E Ducting ........................................................................................................... 7
5.2 Condenser Setup.................................................................................................... 7
5.2 A Location......................................................................................................... 7
5.2 B Electrical Requirements...............................................................................8
5.3 Line Set Installation................................................................................................9
5.4 Brazing the Line Set...............................................................................................11
5.5 Leak Test Line Set and Dehumidifier...................................................................13
5.6 Evacuating the Line Set and the Dehumidifier ................................................. 14
5.7 Charging the System.............................................................................................15
6. Control Options............................................................................................................16
6.1 On Board Dehumidistat........................................................................................16
6.2 External Control....................................................................................................17
6.2 A DEH 3000R.............................................................................................. 18
6.2 B Honeywell Remote Humidstat.................................................................. 18
7. Maintenance................................................................................................................. 18
7.1 Standard Air Filter..................................................................................................19
7.2 Impeller Fan Oiling................................................................................................19
8. Service ...........................................................................................................................19
8.1 Warranty .................................................................................................................19
8.2 Refrigerant Charging............................................................................................19
8.3 Service Parts List - Dehumidifier ........................................................................19
8.4 Service Parts List - Condensing Unit................................................................ 20
8.5 Troubleshooting ................................................................................................... 20
9. Wiring Diagrams ..........................................................................................................22
9.1 Dehumidifier Wiring Diagram..............................................................................23
9.2 Condenser Wiring Diagram.................................................................................23
9.3 Dehumidifier and Condenser Wiring Diagram..................................................23
10. Optional Accessories.................................................................................................24
Warranty ...........................................................................................................................25

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
3www.QuestHydro.com
[e-mail]
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 185 Cool Dehumidifier.
READ AND SAVE THESE INSTRUCTIONS
• The Dehumidifier portion is designed to be installed INDOORS IN A
SPACE THAT IS PROTECTED FROM RAIN AND FLOODING.
• The Condensing unit needs to be protected from the elements (direct
sunlight, rain, snow, etc.) but can be outdoors.
• 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.

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
4www.QuestHydro.com
[e-mail]
1. Intended Application for Quest 185 Cool Dehumidifier
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 185 Cool Dehumidifier, water intrusion
and air infiltration problems should be addressed or noted in calculations.
2. Registrations
The Quest 185 Cool conforms to unified standard UL 474 and CSA Standard C22.2 No. 92.
3. Parts List Included
• Quest 185 Cool Dehumidifier
• Quest 185 Cool Condensing Unit
• Quest 185 Cool Installation Instructions
• Quest 185 Cool Leveling Feet
4. Specifications @ 80°F/60% RH
Dehumidifier: 4037391
Power (Watts): 160
Supply voltage: 110-120 VAC -
1 Phase - 60 Hz.
Current Draw (Amps): 1.4
Energy Factor
(L/kWh): 3.1
Operating Temp: 56°F Min - 95°F Max
Water Removal (Pints/Day):
Eciency (Pints/kWh):
184
6.6
Air Filter (MERV-11): Size: 16" x 20" x 2"
Power Cord 14ga 10’, NEMA 5-15P
Drain Connection: 3/4” Threaded NPT
Refrigerant Type: R410A
Dimensions:
Width:
Height:
Length:
Weight:
20.25"
21.75"
38"
109 lbs
Condenser: 4037392
Power (Watts): 1080
Supply voltage: 110-120 VAC -
1 Phase - 60 Hz.
Current Draw (Amps): 9.7
Minimum Circuit
Ampacity: 20
Maximum Fuse/Breaker 20
Operating Temp: 40°F Min - 115°F Max
Power Cord Hard-Wired
Refrigerant Type:
Refrigerant Amount:
R410A
2lb. 4oz.
Dimensions:
Width:
Height:
Length:
Weight:
10"
25.5"
33"
75 lbs

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
5www.QuestHydro.com
[e-mail]
5. Installation
5.1 Dehumidifier Setup
5.1 A Location
The Quest 185 Cool 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 185 Cool Dehumidifier as a bench or table.
• DO NOT place the Quest 185 Cool 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 185 Cool 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 185 Cool Dehumidifier will help the unit drain with gravity flow. Do not place
the Quest 185 Cool Dehumidifier directly on structural building members without vibration absorbers or unwanted noise
may result.
Electrical Service Access
(Either Side)
Filter 9' Power Cord
Top View
Minimum
Clearance
For Filter
(Either Side)
15"
6" Fresh Air Intake (Optional)
10" Return Air Duct
10" Supply Air Duct
A
B
C
32 3/8"
With Collars Installed
26"
Without Collars Installed
B
C
Drain Port
A
Top View
32 3/8"
With Collars Installed
26"
Without Collars Installed
Drain Port 9' Power CordFilter
Minimum
Clearance
For Filter
(Either Side)
20"
6" Fresh Air Intake (Optional)
10" Return Air Duct
A
B
6” Fresh Air
Intake (Optional)
10” Return Air Duct
Electrical Service Access
(Either Side)
A
B
The 10” Supply Air Duct (not pictured) is
below the Fresh Air Intake and the Return
Air Duct. The same amount of clearance
is needed for the 10” Supply Air Duct.

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
6www.QuestHydro.com
[e-mail]
The Quest 185 Cool 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.
5.1 B Electrical Requirements
The Quest 185 Cool 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 185
Cool 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 185 Cool Dehumidifier and the remote control panel.
The remote controls of the Quest 185 Cool 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 185 Cool Dehumidifier before making the control connections.
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.
5.1 C 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.
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
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
24V AC
COMP FAN
HONEYWELL REMOTE HUMIDISTAT
WIRING DIAGRAM
QUEST DEH 3000R CONTROL
WIRING DIAGRAM
Opt.1 Opt.2

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
7www.QuestHydro.com
[e-mail]
5.1 D Hanging Diagram
5.1 E Ducting
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 185 Cool.
Contact your dealer or call 1-877-420-1330 to order or go to www.questhydro.com/product-category/accessories.
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.
5.2 Condenser Setup
5.2 A Location
• The condensing unit is designed to be installed outdoors in a space that is protected from extreme weather
(rain, wind, etc.). Do not place the condensing unit in direct sunlight.
• Place the condensing unit at least 1” above ground level.
• Place the condensing unit as close as possible to the dehumidifier to minimize the length of the connecting
lines. The maximum line set length is 50 feet.
• Ensure the mounting of the condensing unit can withstand strong winds and earthquakes when mounting
above ground level.
• The condensing unit may be mounted to a wall (with brackets) or placed on a roof.
• Mount the base of the condensing unit to a sturdy level pad (or bracket) using 3/8” (10mm) bolts.
• Avoid directing the discharge air at people.
• If used near a water source; be certain there is no chance the dehumidifier could fall into the water or get
splashed and that it meets NEC standards.
Bottom view of
unit and bracket
Bracket (4036668)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
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
24V AC
COMP FAN
HONEYWELL REMOTE HUMIDISTAT
WIRING DIAGRAM
QUEST DEH 3000R CONTROL
WIRING DIAGRAM

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
8www.QuestHydro.com
[e-mail]
• DO NOT use the condensing unit as a bench or table.
• Do not place the condensing unit where the sound and vibration caused by running the unit will a cause a
nuisance. Vibration dampening material may be installed between the condensing unit base and the mounting
pad if required.
• Allow sucient clearance to handle the unit’s overall dimensions.
• Place the condensing unit where there is adequate space for the unit and the air required by the unit.
• Install the condensing unit with space to access the top and side panels for maintenance and service.
5.2 B Electrical Requirements
The condensing unit requires a dedicated 120Vac 20 Amp circuit capacity. Install a properly sized branch circuit
disconnect (20 Amp) within sight of the unit. The Installer must supply the power wiring for the condensing unit.
The power wiring must have a Minimum Circuit Ampacity of 20A and be run within a rain-tight conduit. The con-
densing unit must be grounded as required by applicable code(s).
Field Wiring the Condensing Unit:
1. Take o the panel (top), by removing the one screw that secures it to the condensing unit.
2. Loosen the two strain relief block screws.
3. Insert the power and control wires through the strain relief block.
4. Connect the power supply wires and control wires to the corresponding terminals on the terminal board.
5. Ground the condensing unit in accordance with local and national electrical codes.
6. Secure the power and control wires to the strain relief block by tightening the screws.
7. Reinstall the panel (top) by inserting the one screw that secures it to the condensing unit.
Condensing Unit Electrical Control Connections:
Connect the black control wire (8) from the dehumidifier to terminal N on the condensing unit terminal block.
Connect the black control wire (9) from the dehumidifier to terminal 1 on the condensing unit terminal block.
Panel (top)
Strain Relief Block
Power Supply
Unit wire harness

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
9www.QuestHydro.com
[e-mail]
5.3 Line Set Installation
The installer must supply a line set (1/4” liquid line, 3/8” gas line) suitable for use with R410a refrigerant to connect
the indoor unit to the outdoor unit. The maximum allowable length of the line set is 50 feet. The installer must
braze the lines to the dehumidifier and the condensing unit. The gas (suction) line must be insulated to prevent the
formation of condensation on the outside of the line.
Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation.
REFRIGERANT LINE SET — TRANSITION
FROM VERTICAL TO HORIZONTAL REFRIGERANT LINE SET — INSTALLING
HORIZONTAL RUNS
To hang line set from joist or rafter, use either metal
strapping material or anchored heavy nylon wire ties.
ANCHORED HEAVY NYLON
WIRE TIRE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
AUTOMOTIVE
MUFFLER-TYPE HANGER
WALL
STUD
STRAP LIQUID LINE TO
VAPOR LINE
LIQUID LINE
VAPOR LINE-WRAPPED
IN ARMAFLEX
NON-CORROSIVE
METAL SLEEVE
VAPOR LINE WRAPPED
WITH ARMAFLEX
LIQUID LINE
CALK
PVC
PIPE
FIBERGLASS
INSULATION
OUTSIDE
WALL
8 FEET
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
WIRE TIE (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIRE
NON-CORROSIVE
METAL SLEEVE
8 FEET
TAPE OR
WIRE TIRE
FLOOR JOIST OR
ROOF RAFTER
FLOOR JOIST OR
ROOF RAFTER
STRAP THE VAPOR LINE TO THE
JOIST OR RAFTER AT 8 FEET
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.
Refrigerant Line Set - Transition From Vertical to Horizontal
Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation.
REFRIGERANT LINE SET — TRANSITION
FROM VERTICAL TO HORIZONTAL REFRIGERANT LINE SET — INSTALLING
HORIZONTAL RUNS
To hang line set from joist or rafter, use either metal
strapping material or anchored heavy nylon wire ties.
ANCHORED HEAVY NYLON
WIRE TIRE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
AUTOMOTIVE
MUFFLER-TYPE HANGER
WALL
STUD
STRAP LIQUID LINE TO
VAPOR LINE
LIQUID LINE
VAPOR LINE-WRAPPED
IN ARMAFLEX
NON-CORROSIVE
METAL SLEEVE
VAPOR LINE WRAPPED
WITH ARMAFLEX
LIQUID LINE
CALK
PVC
PIPE
FIBERGLASS
INSULATION
OUTSIDE
WALL
8 FEET
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
WIRE TIE (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIRE
NON-CORROSIVE
METAL SLEEVE
8 FEET
TAPE OR
WIRE TIRE
FLOOR JOIST OR
ROOF RAFTER
FLOOR JOIST OR
ROOF RAFTER
STRAP THE VAPOR LINE TO THE
JOIST OR RAFTER AT 8 FEET
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.
Refrigerant Line Set - Installing Horizontal Runs

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
10 www.QuestHydro.com
[e-mail]
When installing the line set:
• Make sure the lines are suitable for use with R410a.
• Do not crush the lines and always allow a minimum bend radius of 2 inches.
• Keep the ends of the lines covered to prevent dirt and debris from entering the lines during installation.
• Secure the line set to the building with isolating hardware to prevent vibration transmission to the building.
• Seal and isolate the opening(s) where the line set is routed into the building.
• Insulate the gas (suction) line to prevent water condensation on the gas line.
• Flush the lines with an inert gas before and/or during brazing to prevent oxidation inside the lines.
• Release the inert gas holding charge and remove the plugs in the dehumidifier lines before brazing.
• Do not overheat the lines connected to the dehumidifier or the condensing unit when brazing.
• Be aware of the relative location of the dehumidifier (Indoor unit) and condensing unit (Outdoor Unit) when
installing the line set.
30 FT
MAX
CONDENSING
UNIT
DEHUMIDIFIER
30 FT
MAX
CONDENSING
UNIT
OIL TRAP
DEHUMIDIFIER
The maximum allowable elevation
dierence between the dehumidifier
and condensing unit is 30 feet.
If the elevation dierence between
the dehumidifier and condensing
unit is greater than 16 feet, an oil
trap should be created in the line
set.

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
11 www.QuestHydro.com
[e-mail]
5.4 Brazing the Line Set
WARNING!
Polyol ester (POE) oils used with HFC-410A refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed as much as possible. Do not remove line set
caps or service valve stub caps until you are ready to make connections.
When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning
system, use a regulator that can control the pressure down to 1 or 2 PSIG.
CAUTION!
Brazing alloys and flux contain materials which are hazardous to your health. Avoid breathing
vapors or fumes from brazing operations. Perform operations only in well-ventilated areas. Wear
gloves and protective goggles or face shield to protect against burns. Wash hands with soap and
water after handling brazing alloys and flux.
To prevent stripping of the various caps used, the appropriately sized wrench should be used and
fitted snugly over the cap before tightening.
Allow braze joint to cool before removing the wet rag from service valve. Temperatures above 250°
can damage seals.
Use silver alloy brazing rods with 5% minimum silver alloy for copper-to-copper brazing. Use 45%
minimum silver alloy for copper-to-brass and copper-to-steel brazing.
WARNING!
Fire, explosion and personal safety hazard. Failure to follow this warning could result in damage,
personal injury or death. Never use oxygen to pressurize or purge refrigeration lines. Oxygen when
exposed to a spark or open flame, can cause fire and/or an explosion, that could result in property
damage, personal injury or death.
Note: There is a service port inside the dehumidifier (on the gas line) and both stub tubes of condensing unit. These
service ports can be used to introduce and release nitrogen during brazing.
CAUTION!
The dehumidifier is shipped from the factory pressurized with a charge of inert gas and with rubber
plugs in the lines. Purge the inert gas from the dehumidifier by removing the rubber plugs in the
liquid and gas lines to release the inert gas before connecting the line set.
Note: If there is no pressure in the dehumidifier when the first plug is removed, check the dehumidifier for damage
and leaks before continuing with the installation.

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
12 www.QuestHydro.com
[e-mail]
Use the following procedure to connect the line set to the Dehumidifier:
1. Purge the inert gas from the dehumidifier by removing the rubber plugs in the liquid and gas lines to release the
inert gas before connecting the line set.
2. Place a field-provided heat shield, such as a wet rag, against the dehumidifier and around the piping stubs. The
heat shield must be in place to protect the cabinet from heat damage.
3. Swage the liquid and gas lines (if necessary) to fit onto the dehumidifier lines.
4. Purge the dehumidifier lines and the line set with dry nitrogen (Inert gas) to prevent oxidation during brazing.
Flow dry nitrogen into the lines at a low pressure of 1 to 2 psig.
5. Braze the line set lines to the dehumidifier lines.
6. Remove the heat shield after brazing and allow the connections to cool.
Use the following procedure to connect the line set to the Condensing Unit:
1. Cut the line set lines to the required length. Deburr the cut ends of the line set lines.
2. Fit the line stubs with flare fittings (included with the condensing unit) onto the line set if necessary.
3. Swage the liquid and gas lines (if necessary) to fit onto the line stubs with the flare fittings.
4. Remove service valve caps and cores.
5. Purge the lines with dry nitrogen (Inert gas) to prevent oxidation during brazing.
6. Braze the line set lines to the line stubs.
7. Apply a light coating of refrigeration oil to the flare fitting threads on the condensing unit valves.
8. Start each flare nut on the corresponding flare fitting on the condensing unit valves by hand, making sure the
threads are properly engaged. Tighten the flare nuts hand tight.
9. Carefully torque the flare nuts to the corresponding flare fittings on the condensing unit valves.
• Torque the liquid line flare nut to 13.3 ft-lbs.
• Torque the suction line flare nut to 30.1 ft-lbs.
10. Reinstall service valve cores and caps.
Note: Alternately, the stubs with the flare fittings can be connected to the condensing unit before brazing the line
set. In this case a field provided heat shield, such as a wet rag, must be placed over the flare fittings and valves on
the condensing unit to protect them from heat damage. The service valve cap and core should be removed before
brazing near stub tubes.
3-WAY VALVE 2-WAY VALVE
LIQUID LINE STUB
GAS LINE
STUB
SERVICE VALVE CAPS
VALVE ROD CAPS
VALVE STEMS

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
13 www.QuestHydro.com
[e-mail]
5.5 Leak Test Line Set and Dehumidifier
Manifold Gage Set
When checking the system charge, use a manifold gage set that features low loss anti-blow back fittings. Manifold
gage set used with HFC-410A refrigerant systems must be capable of handling the higher system operating
pressures. The gages should be rated for use with high side operating pressures of 0 – 800 psig and low side
operating pressures of 30 inches of vacuum to 250 psig. Dampened gages or anti-flutter gages are recommended.
Gage hoses must be rated for use at up to 800 psig of pressure with a 4000 psig burst rating.
CAUTION!
The environmental protection agency (EPA) prohibits the intentional venting of HFC refrigerants
during maintenance, service, repair and disposal of appliance. Approved methods of recovery,
recycling or reclaiming must be followed.
WARNING!
When using a high pressure gas such as dry nitrogen to pressurize refrigeration or air conditioning
system, use a regulator that can control the pressure down to 1 or 2 PSIG.
CAUTION!
Leak detector must be capable of sensing HFC refrigerant.
WARNING!
Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.
Failure to follow this warning may result in personal injury or death.
1. Connect the HFC-410A manifold gage set high pressure hose to the service port on the suction gas line. Note:
Connecting the high pressure hose to the service port
on the gas line will protect the manifold gage set from
high pressure damage during leak testing. Cap liquid line
service port.
2. Make sure all of the valves on the manifold gage set are
closed. Connect a cylinder of HFC-410A refrigerant to
the center port of the manifold gage set.
3. Position the HFC410A refrigerant cylinder to deliver
vapor only. Open the valve on the HFC-410A
refrigerant cylinder.
4. Open the high pressure side of the manifold gage set to
allow HFC-410A into the line set and dehumidifier.
Weigh in a trace amount of HFC-410A [A trace
amount is a maximum of two ounces (57g) of
refrigerant or 3 PSI]. Close the valve on the HFC-410A cylinder and the valve on the high pressure side of the manifold
gage set.
5. Disconnect the HFC-410A refrigerant cylinder from the manifold gage set.
6. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gage set.
LOW HIGH
MANIFOLD GAUGE SET
NITROGEN
HFC-410A
TO VAPOR
SERVICE
VALVE
OUTDOOR UNIT

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
14 www.QuestHydro.com
[e-mail]
7. Adjust the dry nitrogen pressure regulator to 150 psig. Open the valve on the high pressure side of the manifold gage set
to pressurize the line set and dehumidifier.
8. Close the valve on the dry nitrogen cylinder. Close the valve on the high pressure side of the manifold gage set.
9. Allow the system to rest for a few minutes.
10. Check all (brazed and threaded) joints for leaks using a leak detector designed to sense HFC refrigerants.
11. After leak testing is complete, disconnect the dry nitrogen cylinder from the center port of the manifold gage set and
disconnect the high pressure hose of the manifold gage set from the suction gas line service port.
5.6 Evacuating the Line Set and The Dehumidifier
1. Remove the valve cores from the service ports on the liquid and gas line stubs using no-loss valve core removal
tools.
2. Connect a 1/4” SAE in-line tee to the gas line stub valve core removal tool.
3. Connect the low pressure side of the manifold gage set to one of the ports on the 1/4” SAE in-line tee.
4. Connect a micron gage to the remaining port of the 1/4” SAE in-line tee.
5. Connect the high pressure side of the manifold gage set to the liquid line stub service port.
6. Connect a vacuum pump to the center port on the manifold gage set.
7. Open the valve core removal tool valves.
8. Open the high and low pressure sides of the manifold gage set and start the vacuum pump.
9. After evacuating for a few minutes, close the high and low pressure sides of the manifold gage set and observe the
behavior of the micron gage. A rapid rise in the micron gage reading (pressure) indicates a leak in the system. If this
occurs, check the manifold gage set, hoses, tee, and valve core removal tools for leaks. If no leak is found, repeat the
leak test procedure on Page 15.
10. Evacuate the line set and dehumidifier for a minimum of 15 minutes and check that the micron gauge reads
below 500 microns.
11. Close the low and high pressure sides of the manifold gage set and stop the vacuum pump.
12. Wait 10 minutes.
13. If the micron gage reading rises above 800 microns, check for leaks and return to step 9.
14. If the micron gage reading remains below 800, close the valves on the valve core removal tools.
15. Remove the tee from the gas line stub valve core removal tool. Connect the low pressure side of the manifold
gage set to the gas line stub valve core removal tool.
16. Install the valve core into the liquid line stub service port.
17. Remove the vacuum pump from the center port of the manifold gage set and proceed to the next section to
charge the system.

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
15 www.QuestHydro.com
[e-mail]
5.7 Charging the System
The condensing unit is pre-charged with 42 oz. of HFC-410A refrigerant. The installer will add HFC-410A refrig-
erant for the dehumidifier and line set.
1. Calculate the amount of HFC-410A required by determining the length of the line set and performing the
calculation below:
11oz + 2.2oz per every 10 feet of line set length = Total charge required
2. Connect a cylinder of HFC-410A refrigerant to the center port of the manifold gage set. Position the HF-
C410A refrigerant cylinder to deliver liquid only.
3. Open the valve on the HFC-410A cylinder.
4. Place the HFC-410A cylinder on a refrigerant scale and zero the scale.
5. Open the valve on the gas line stub valve core removal tool.
6. Open the low pressure side of the manifold gage set and weigh in the amount of HFC-410A calculated in step 1.
7. Close the valve on the HFC-410A cylinder and the low pressure side of the manifold gage set.
LOW HIGH
VACUUM PUMP
MANIFOLD
GAUGE SET
MICRON
GAUGE
TO VAPOR
SERVICE VALVE
OUTDOOR
UNIT
RECOMMEND
MINIMUM 3/8” HOSE
500
TO LIQUID SERVICE VALVE

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
16 www.QuestHydro.com
[e-mail]
8. Close the valve on the gas line stub valve core removal tool.
9. Remove the high and low pressure sides of the manifold gage set from the valve core removal tools.
10. Install the valve core in the gas line stub port using the no-loss valve core removal tool
11. Remove the no-loss valve core removal tools from the service ports on the liquid and gas line stubs.
12. Install the caps on the service ports of the liquid and gas line stubs finger tight, then tighten an additional 1/6
turn. Check the service port caps for leakage – reinstall if necessary.
6. Control Options
The Quest 185 Cool Dehumidifier can be controlled by its on board dehumidistat or with an external control using its low
voltage terminal block.
6.1 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.
OUTDOOR
UNIT
TO VAPOR
SERVICE
VALVE
MANIFOLD
GAUGE SET
RECOMMEND
MINIMUM 3/8” HOSE
LOW HIGH
HFC-410A
12 111
10
9
8
765
4
3
2
12 111
10
9
8
765
4
3
2
1/6 turn
1/12 turn
4037356

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
17 www.QuestHydro.com
[e-mail]
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.
6.2 External Control
The Quest 185 Cool 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, otherwise the dehumidifier will run at the lowest setpoint between the
dehumidistat and external control.
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 185 Cool dehumidifier and the external control
Quest oers two external control options

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
18 www.QuestHydro.com
[e-mail]
6.2 A DEH 3000R
Quest recommends a maximum of 6 dehumidifiers linked together.
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.
6.2 B Honeywell Remote Humidistat
7. 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.
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
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
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
4020175
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
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

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
19 www.QuestHydro.com
[e-mail]
7.1 Standard Air Filter
The Quest 185 Cool 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 185 Cool Dehumidifier. The filter should
be readily visible and can be removed by pulling it straight out of the Quest 185 Cool Dehumidifier.
We recommend changing the filter at least with every grow cycle.
7.2 Impeller Fan Oiling
The impeller fan motor is factory lubricated for many years of normal operation, and no further oiling is required.
8. Service
8.1 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.
8.2 Refrigerant Charging
WARNING!
Servicing the Quest 185 Cool 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.
Service must be performed by a qualified service technician.
If the refrigerant charge is lost due to service or a leak, the leak should be repaired and a new charge must be ac-
curately weighed in. If any of the old charge is left in the system, it must be recovered before weighing in the new
charge. Refer to the unit nameplate for the correct charge weight and refrigerant type.
8.3 Service Parts List - Dehumidifier
Item Part No. Description
1 4021475 Air Filter 16”x20”x2” MERV-11
2 4026221 Foot, Leveling, 5/16-18
3 4031086-05 Evaporator Coil
4 4029510 Filter/Drier
5 4025741 Thermostat, Defrost Control
6 4029508 Low Pressure Switch
7 4026657 Impeller
8 4035235-07 Blower Capacitor, Run, 15 MFD, 370V, Dry
9 4020924 Blower Relay, SPDT, 24V, 15A
10 4022487 Transformer

1-877-420-1330
Quest 185 Cool Installation, Operation and Maintenance Instructions
20 www.QuestHydro.com
[e-mail]
8.4 Service Parts List - Condensing Unit
Item Part No. Description
1 4033211 Nut
2 4033212 Fan-Axial
3 4033213 Compressor
4 4033214 Capacitor
5 4033216 Capacitor-Fan Motor
6 4033215 Motor
7 4022484 Relay
8.5 Troubleshooting
CAUTION!
Troubleshooting should be performed by a qualified HVAC technician.
Neither fan nor compressor running. Dehumidification is being called for.
1. Dehumidifier 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. Fan is running.
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.
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.
6. Defective fan or relay.
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.