Quest 225 Dehumidifier Instruction Manual
- June 15, 2024
- Quest
Table of Contents
225 Dehumidifier
Product Information – Quest 225 Dehumidifier
- Digital Controls
- M-CoRR Technology
- Industry-Leading Efficiency
- Superior MERV-13 Air Filtration
- Integrated Lift and Hang Points
For more information, visit questclimate.com
or call (877)
420-1330.
This product is Title 24 compliant in California. Patents can be
found at thermastor.com/patents.
Specifications:
- Blower: 650 CFM @ 0.6 WG (tested with duct collars on)
- Power: 1150 Watts
- Supply Voltage: 208V and 230V
- Current Draw: 5.3A @ 230V, 5.6A @ 208V
- Recommended Breaker Size: 15A
- Energy Factor: 8.0A
- Operating Temperature: Not specified
- Water Removal: 225 Pints/Day, 8.2 Pints/kWh
- Air Filter: MERV-13, Size: 22 x 20 x 2
- Power Cord: 10′ 14/3 SJTW, NEMA 6-15P
- Drain Connection: 3/4 Threaded NPT
- Refrigerant Type: R410A
- Refrigerant Amount: 4 lb 12 oz
- Dimensions: Width: 23.6″, Height: 20.9″, Length: 26.8″
- Weight: 130 lb (Shipping weight: 152 lb)
Please note that specifications are subject to change without
notice.
Product Usage Instructions – Quest 225 Dehumidifier
1. Intended Application
In order to efficiently control humidity levels, ensure that the
area in which the dehumidifier is to be operated is free of water
intrusion or excessive fresh (outside) air infiltration. Before
installing the Quest 225 Dehumidifier, address any water intrusion
and air infiltration problems or note them in calculations.
2. Registrations
The Quest 225 Dehumidifier units conform to unified standard UL
60225-2-40, CSA C22,2#60225-2-40. It is also protected by US
Patents: D570,988 / 8,069,681 / 9,052,132.
4. Installation
4.1 Location
Choose a suitable location for the installation of the Quest 225
Dehumidifier.
QUEST
225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Digital Controls M-CoRR Technology Industry-Leading Efficiency Superior
MERV-13 Air Filtration Integrated Lift and Hang Points
QUESTCLIMATE.COM / 877-420-1330
Serial Number Install Date Sold By
CALIFORNIA
TITLE 24 COMPLIANT
Patents: thermastor.com/patents
TS-1244 08/23 REV A
QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
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 Water Removal ………………………….6 4.4 Hanging Diagram
………………………………………….7 4.5 Ducting …………………………………………………………8 4.6 Hard-Wiring
……………………………………………….. 12 5. Control Options………………………………………………….. 16
5.1A On Board Dehumidistat ………………………. 16 5.2B External Control
Options……………………. 17 5.2 External Control………………………………………….. 18 6. Maintenance
………………………………………………………. 18 6.1 Standard Air Filter……………………………………….. 18 6.2
Impeller Fan Oiling ……………………………………… 18 7. Service……………………………………………………………….. 19
7.1 Warranty……………………………………………………….. 19 7.2 Technical Description
………………………………….. 19 7.3 Troubleshooting…………………………………………… 19 7.4 Refrigerant
Charging…………………………………… 21 7.5 Impeller Fan Replacement…………………………… 21 7.6
Compressor/Capacitor Replacement ………….. 21 7.6A Checking Compressor Motor
Circuits … 21 7.6B Replacing a Burnt Compressor………….. 22 7.6C Replacing
Compressor-Nonburn Out…. 22
7.7 Remote Controls…………………………………………. 22 7.7A Humidity Control ………………………………..
23
7.8 Defrost Thermostat …………………………………….. 23 7.9 Condensate Pump
Kit…………………………………. 23 8. Error Codes……………………………………………………….. 24 Wiring
Diagram………………………………………………………. 25 Service Parts List ………………………………………………….. 26
Optional Parts List ………………………………………………… 26 Warranty……… …………………………………………………………
28
4201 Lien Rd. Madison, WI 53704
1-877-420-1330 Thermastor.com © 2023
Therma-Stor LLC
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QUESTCLIMATE.COM
QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
SAFETY PRECAUTIONS
Read the installation, operation and maintenance instructions carefully before
installing and operating this device. Proper adherence to these instructions
is essential to obtain maximum benefit from your Quest 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. » Maintain a
minimum 1ft. (.3m) clearance to avoid obstructing the air return and supply. »
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. » Not
intended for use at altitudes over 6500 ft (2000M).
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
1. INTENDED APPLICATION FOR QUEST 225
The Quest 225 Dehumidifier is designed to operate in temperatures between 56°
and 95°F.
In order to efficiently 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 225
Dehumidifier, water intrusion and air infiltration problems should be
addressed or noted in calculations.
2. REGISTRATIONS
The Quest 225 Dehumidifier units conform to unified standard UL 60225-2-40,
CSA C22,2#60225-2-40. US Patents: D570,988 / 8,069,681 / 9,052,132.
3. SPECIFICATIONS @ 80°F/60% RH
UNIT
BLOWER: (TESTED WITH DUCT
COLLARS ON)
POWER:
SUPPLY VOLTAGE:
CURRENT DRAW:
MCA MOP RECOMMENDED BREAKER SIZE: ENERGY FACTOR: OPERATING TEMP: WATER
REMOVAL: EFFICIENCY: AIR FILTER: MERV-13
POWER CORD: 10′ 14/3 SJTW
QUEST 225
4042800
650 CFM @ 0.6″ WG
1150 Watts 208V and 230V 1 Phase – 60 Hz
5.3A @ 230V 5.6A @ 208V
8.0A 15A 15A
3.9 L/kWh 56 F Min95 F Max
225 Pints/Day 8.2 Pints/kWh Size: 22″ x 20″ x 2″
NEMA 6-15P, 10′
DRAIN CONNECTION:
REFRIGERANT TYPE:
REFRIGERANT AMOUNT:
DIMENSIONS: WIDTH: HEIGHT: LENGTH: WEIGHT:
Unit 23.6″ 20.9″ 26.8″ 130 lb
3/4″ Threaded NPT R410A
4 lb 12 oz Shipping 25″ 21″ 29″ 152 lb
- MCA = Minimum Circuit Ampacity This number provides a qualified electrician with the information needed to determine the minimum wire size used in the circuit that feeds a single dehumidifier.
- MOP = Maximum Overcurrent Protection This number provides a qualified electrician with the value of the maximum size circuit breaker that may be used to protect the circuit that feeds a dehumidifier.
Specifications are subject to change without notice.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4. INSTALLATION
4.1 LOCATION
The Quest 225 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:
» Place the Quest 225 Dehumidifier on supports that raise the base of the unit
6″ above the secondary drain pan so a P-trap can be installed. See Section
4.3.
» The Quest 225 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. See section 4.3.
» If installing on ground, use included plugs to cover hanging locations on
top of the machine.
» If hanging machine in air, use included plugs to cover holes in base pan for
leveling feet.
4.2 ELECTRICAL REQUIREMENTS
The Quest 225 Dehumidifier plugs into NEMA rated receptacles. The amp draw
under normal operating conditions is listed on page 4. A ground fault
interrupter protected circuit is required.
Install the remote hygrostat in a central area of the structure where it will
sense the relative humidity of the structure accurately. Do not install the
hygrostat 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 225 Dehumidifier and the
hygrostat. Be sure to safely route the control wiring to prevent damage during
installation. Be careful not to cross the wires when connecting the Quest 225
Dehumidifier and the remote hygrostat.
The remote controls of the Quest 225 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 225 Dehumidifier before making the
control connections.
CAUTION! Always disconnect the Quest 225 from a power source when
working with the high voltage control wires.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
CAUTION! For proper drainage, the unit must be mounted so the drain outlet
is at least 6.75″ 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.
An optional condensate pump kit may be installed if a lift is required to
dispose of the condensate. Optional parts list for information on the kit.
FOLLOW DIAGRAM:
Drain Trap Configuration CAP
VENT OPEN
QUEST 225
H = 4″
J = 2″ L = 6.75″ Vent:
H L
» Place vent after the trap.
J
» Vent should be open.
» Height of vent should be higher than drain outlet.
Cap: » A clean out can be placed before trap but must be sealed with a cap.
Drain Line: » Drain line should go in a downward slope to the drain. » 1/4″ drop per foot.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4.4 HANGING DIAGRAM QUEST 225
3/8″ threaded rod
16.6″
19.4″
Treated Air
3/8″ Jam Nuts
Intake Air
Parts Needed: 4 pieces 3/8″ threaded rod (not included) 4 – 3/8″ threaded jam nuts (not included)
Threaded rods should be engaged no less than 2″ into machine.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4.5 DUCTING
Return and supply duct collars are optional accessories for the Quest 225 and
not included with the unit.
CAUTION! Do not connect with a static pressure greater than or equal to +1.0
WG. Contact
technical support at 877-420-1330 for
additional details.
DUCTING CONSIDERATIONS:
» All flexible ducting connected to the Quest 225 should be UL listed. » A
short piece of flexible ducting on all Quest 225 duct connections is
recommended
to reduce noise and vibration transmitted to rigid ductwork in the structure.
» Use a minimum 10″ diameter round or equivalent rectangular duct for total
duct
lengths of up to 25′. » Grills or diffusers on the duct ends must not
excessively restrict airflow. » A length of 8″ or more of insulated flex duct
or any other vibration isolating material on the
outlet of the Quest 225 will reduce air noise from the blower. » When ducting
two or three areas, use 8″ or larger diameter branch ducting. When ducting to
four or more areas, use 6″ or larger diameter branch ducting. Provisions must
be made to provide airflow supply locations to the central return location.
Proper air distribution is important to ensure even humidity control and heat
distribution throughout the structure.
QUEST 225 SUPPLY AND RETURN DUCT KIT (P/N 4043235)
If factory duct kit accessory was purchased, follow instructions included with
duct kit. If owner chooses to have a licensed HVAC contractor fabricate a duct
kit, please follow the drawing below for safe zones for self tapping screws.
HATCH AREA REPRESENTS SAFE ZONE FOR FASTENERS.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
DUCTING TO HVAC OPTIONS
A. HVAC SUPPLY TO SUPPLY
CAUTION! To avoid the dehumidifier cycling in and out of DEFROST, it is
recommended
that the leaving air temperature of the A/C coil is not below 55°F. Also, this
install is not recommended for climates where the heating system will run
during the spring and fall times of year, as this could diminish the water
removal capability of the dehumidifier. If the Check Damper is not used, it is
important to have the HVAC system fan ON when the dehumidifier is ON to
prevent backflow of air.
WARNING! Due to pressure resistance it is not recommended to use the optional
outdoor air intake when installing the dehumidifier supply to supply.
B. DEDICATED RETURN TO SUPPLY
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
CAUTION! PLEASE NOTE: Return to Return installs are to be considered last
resort options and are not
recommended. The dehumidifier will heat the AC cooling coils which diminishes
the amount of water the AC system will remove when operating. If this
installation is chosen, the dehumidifier must activate the HVAC blower and AC
calls need to lock out the dehumidifier from running. Please check your local
codes prior to installing.
C. DEDICATED QUEST RETURN TO HVAC RETURN
Quest 225 Indoor Air Return
Create a separate return for the Quest 225 Dehumidifierin a central area of
the building. Installing the supply air from the Quest 225 Dehumidifier to the
return of the HVAC system requires the HVAC fan to run when the Quest
Dehumidifier is operating.
D. HVAC RETURN TO HVAC RETURN
NOTE: If Check Damper is not in place, the HVAC fan must ON when the dehumidifier is in operation.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
E. HVAC RETURN TO HVAC SUPPLY
Check damper should be in place between the Return and Supply connections of
the dehumidifier.
If the Check Damper is not in place, the HVAC fan must be ON when the
dehumidifier is in operation.
Anything greater than 0.4″ of static requires HI fan setting. Anything greater than 0.7″ of static requires HI override (99). Anything greater than 0.9″ is not recommended.
F. NO EXISTING DUCTWORK INSTALLATION
When installing the Quest 225 Dehumidifier in a structure that does not have a
forced-air HVAC system, a single return for the dehumidifier should be
installed in a central location. The supply air should be ducted back into the
space you want to dry. Proper air distribution is important for optimal
performance of the dehumidifier.
Install a 6″ insulated duct from outside, teeing into the 14″ return duct of
the Quest 225 Dehumidifier to provide outdoor air ventilation (optional).
An 14″ diameter duct is recommended for branches to larger areas.
Quest 225 Indoor Air Return
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4.6 HARD-WIRING INSTRUCTIONS
WARNING! Servicing the Quest 225 Dehumidifier, 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.
TOOLS REQUIRED:
» T25 Torx Driver » 11/32″ Driver
Following all local and national electrical codes and standards, route
electrical service to the location that the dehumidifier will be installed.
Remove 7 screws on access panel using T25 Torx driver, remove panel.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Disconnect power cord black wire
Wire harness black wire
Disconnect power cord white wire
Disconnect power cord green wire
from ground stud
Wire harness white wire
Disconnect POWER CORD BLACK wire from terminal
Disconnect POWER CORD WHITE wire from terminal.
Use 11/32″ driver to remove nut from ground stud and disconnect POWER CORD
GREEN wire from ground stud.
Remove bushing from
7/8″ hole
Remove cord retention bracket
Remove the 2 screws holding the cord retention bracket using T25 Torx driver
and remove retention bracket.
Remove power cord and black bushing.
Route incoming power service wires through 7/8″ hole and secure using clamps
intended for the conduit or cable.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Hardwire kit with jumper wires can be found in the pack part kit.
Connect BLACK and WHITE jumper wires to terminal block as shown. Place GREEN jumper wire ring terminal on ground stud and use 11/32″ driver to secure nut to stud. Attach incoming service LINE 1 wire to BLACK jumper wire with the provided wirenut. Attach incoming service LINE 2 wire to WHITE jumper wire with the provided wirenut. Attach incoming service GROUND wire to GREEN jumper wire with the provided wirenut.
Connect black jumper wire
Wire harness Black wire
Connect white jumper wire
Wire harness white wire
Green jumper wire to ground stud
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Replace access panel using T25 Torx driver to secure 7 screws.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
5. CONTROL OPTIONS
The Quest 225 Dehumidifier can be controlled by its on board dehumidistat or
with an external control using its low voltage terminal block.
5.1A QUEST 225 ONBOARD DEHUMIDISTAT
Off Mode: Fan, Compressor, Display and all LEDs are off To Turn Unit On: Press
the power button On Mode: Display is on and shows the set point (Initial set
point: 55% RH) To Change Set Point: » Press the up or down arrow once, the
2-digit display will begin to blink. » Adjust to desired RH. Each push of the
button will change the SP 1% RH. » After 6 seconds without a button being
pushed the number showing will become the new SP
DEFROST LIGHT
» The light over the snowflake will light up when defrost is occurring (ice is
detected on coils). The fan will be on, and the compressor will be off during
defrost.
FILTER RESET
» Filter reset button will light up after the fan has been running for 2,000
hours, or if the pressure switch detects excessive pressure build-up
indicating that the filter must be changed.
» After changing the filter, press and hold the filter reset button to reset
the 2,000-hour timer. Light flashes while button is held.
DARK MODE
» Press the Dark Mode button to activate Dark Mode.
» Once Dark Mode is activated, lights will remain on for 20 seconds before the
unit’s hygrostat will go dark. Dark Mode light will flash for 3 seconds before
unit goes dark.
» Unit will temporarily leave dark mode when any button is pushed and will go
dark 20 seconds after the last button is pushed.
» To turn off Dark Mode, press the Dark Mode button and ensure light above
Dark Mode button is off.
» This mode is for applications where the user would like the unit to operate
without emitting any light.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
FAN
Pressing the Fan button alternates the unit between 3 fan speeds:
» (Hi)gh: Increased fan speed to be used exclusively in ducted applications.
Deactivates filter-life compensation mode.
» (Au)to: Default fan speed. Filter-life compensation mode active.
» (Lo)w: Decreased fan speed that lowers the volume and performance of the
unit. Deactivates filterlife compensation mode.
Filter-life compensation mode measures the static pressure increase due to the
filter particulate build-up and increases fan speed to maintain optimum
airflow and performance.
Changing Max Fan Speed
» Hold the FAN button for 3 seconds, the 2-digit display will begin to flash.
» Once the display is flashing, the maximum fan speed can be adjusted 1% at at
time (in the range of
20-99%). » The new maximum fan speed can be locked by not pressing any buttons
for 6 seconds or by pressing
the FAN button. » This will disable filter life compensation functionality.
TERMINAL CONTROL
» When the Terminal Control button is pressed, the display will show “tc”.
» The Terminal Control button is used to activate the “DEHUM” input on the
terminal block. (see section 5.1B)
» This must be activated when an external control is used to control RH. When
Terminal Control is active, the internal RH sensor is disabled.
5.1B QUEST 225 EXTERNAL CONTROL OPTIONS
Quest offers three external control options: Quest DEH 3000R and Honeywell
Humidipro.
NOTE: 22 ga wire needed for sensor
4028531
4041649
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
5.2 QUEST 225 EXTERNAL CONTROL
DAISY CHAIN QUEST DEH 3000R CONTROLLER
24VAC
QUEST 225 UNIT#3
QUEST 225 UNIT#2
QUEST 225 UNIT#1
FLOAT DEHUM
FLOAT 24VAC
ALARM
FAN
ALARM 24V COM
FLOAT DEHUM
FLOAT 24VAC
ALARM
FAN
ALARM 24V COM
FLOAT DEHUM
FLOAT 24VAC
ALARM
FAN
ALARM 24V COM
*NOTE DO NOT WIRE IN “FAN” TERMINAL WITH THIS APPLICATION
To order, contact your dealer, call
1-877-420-1330, or go to:
www.questclimate.com/product-category/accessories
Remove the cover from the user interface to expose the terminal block inputs &
outputs.
COMP FAN
Quest 225 Terminal Block Control Operations:
DEHUM: 24VAC: Fan: 24V COM: FLOAT: FLOAT: Alarm: Alarm:
Dehumidification (Fan and Compressor) Control Input. Transformer High Side Output to External Control. Fan Control Input. 24VAC Power Transformer Neutral Side Output to External Control. External Low Voltage Float Switch or Water Sensor Input (Use Normally Closed Switch). External Low Voltage Float Switch or Water Sensor Input (Use Normally Closed Switch). Normally Closed Relay Output – Indicates when dehumidifier is in an alarm state. Normally Closed Relay Output – Indicates when dehumidifier is in an alarm state.
NOTE: Alarm terminals are used to interface with a remote alarm or building automation system. The terminals switch when the unit has a malfunction and are factory set to “normally closed” but can be changed to “normally open”.
6. MAINTENANCE
WARNING! NOTE: Do not operate the unit without the filter or with a less
effective
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 225 Dehumidifier ships with a standard MERV-13 efficient pleated
fabric filter. This filter should be checked every six months. Operating the
unit with a dirty filter will reduce dehumidifier capacity and efficiency and
may cause the compressor to cycle off and on unnecessarily on the defrost
control.
To access the air filter, remove the filter access panel from the end of the
Quest 225 Dehumidifier. The filter should be readily visible and can be
removed by pulling it straight out of the Quest 225 Dehumidifier.
We recommend changing the filter at least every 6 months. For agriculture we
recommend changing the filter 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.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
7. SERVICE
WARNING! Servicing the Quest 225 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.
7.2 TECHNICAL DESCRIPTION
The Quest 225 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 expanion 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 compressor collects the cool
refrigerant gas and compresses it to a high pressure and temperature to repeat
the process.
7.3 TROUBLESHOOTING
Unit Test to determine problem: 1. Detach any exterior control wiring by
removing terminal block but jump both FLOAT terminals
together. 2. Reinstall terminal block into the control. 3. Plug unit in to
known good power outlet. 208 to 240 volts. 4. Power unit on by pressing power
button on top of control. 5. Make sure the Terminal Control light is NOT
illuminated. Press button to change. 6. Press down arrow to set the unit below
20% until “on” is displayed. This will force the unit on. 7. Listen for the
fan to turn on almost immediately. 8. Wait 1 to 2 minutes for the compressor
to turn on. 9. If these tests work, the problem is most likely in the control
or field wiring.
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. Bad control or
power board. 5. Defective control transformer.
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QUESTCLIMATE.COM
QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Compressor is not running. Dehumidification is being called for. No fan call.
- Defective compressor run capacitor. 2. Loose connection in compressor circuit. 3. High pressure switch open or unplugged. 4. Defective compressor.
- Compressor relay defective or unplugged. 6. Temp & RH sensor reading above
120°F or below 40°F, or sensor is bad or unplugged.
Compressor cycles on and off. Dehumidification is being called for. No fan call. 1. Low ambient temperature and/or humidity causing unit to cycle through defrost mode. 2. Evaporator temp sensor bad or unplugged. 3. Defective compressor. 4. High pressure switch defective. 5. Dirty air filter(s) or air flow restricted. 6. Bad control or power board.
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. Bad control or power board.
Low dehumidification capacity (evaporator is frosted continuously). Dehumidification is being called for. 1. Evaporator temp sensor bad or unplugged. 2. Low refrigerant charge. 3. Dirty air filter(s) or air flow restricted. 4. Excessively restrictive ducting connected to unit.
Unit removes some water, but not as much as expected. 1. Air temperature and/or humidity have dropped. 2. Humidity meter and or thermometer used are out of calibration. 3. Unit has entered defrost cycle. 4. Air filter dirty. 5. Low refrigerant charge. 6. Air leak (eg. loose cover or ducting leaks). 7. Defective compressor. 8. Restrictive ducting. 9. Unit is in (Lo)w fan mode. - Evaporator temp sensor bad or unplugged. 11. Temp and RH sensor off calibration. Reading lower than actual. 12. Air pressure switch off calibration.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Filter Change Light illuminated (too frequently): 1. Change filter if dirty.
2. Hold filter change button to reset filter life hours. 3. Ducting
configuration causing poor airflow. Disable filter change light by selecting a
different fan
speed.
7.4 REFRIGERANT CHARGING
If the refrigerant charge is lost due to service or a leak, a new charge must
be accurately 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.
7.5 IMPELLER FAN REPLACEMENT
The motorized impeller fan is a unitary assembly consisting of the motor and
impeller fan. If defective, the complete assembly must be replaced. 1. Unplug
the power cord. 2. Remove the access panel, and top panel. 3. Remove the
screws attaching the impeller fan support bracket to the base. 4. Disconnect
the impeller fan leads inside the electric box. 5. Remove fan/bracket assembly
by removing 3 screws from the bracket and inlet ring assembly. 6. Remove the
defective impeller fan from the bracket and replace with it with the new
impeller fan. 7. Reassemble the new impeller fan by reversing the above
procedure. Note: There are two pins on the
backside of the cabinet that must align with the two holes in the impeller fan
support bracket.
7.6 COMPRESSOR/CAPACITOR REPLACEMENT
This compressor is equipped with a run capacitor, but no start capacitor or
start relay.
7.6A CHECKING COMPRESSOR MOTOR CIRCUITS
Perform the following tests if the impeller fan runs but the compressor does
not with a call for dehumidification. 1. Remove the cabinet side to gian
access to the electrical components. 2. Plug in the unit and turn the humidity
control to ON. Check for volts from compressor black wires on
compressor relay to white wire on compressor capacitor using an AC voltmeter.
2.1 If correct voltage is present, go to next step. 2.2 If no voltage, there
may be a loose connection in the compressor circuit. Test each component
for continuity. See the appropriate section if a defect is suspected. 3.
Unplug the unit and then disconnect the connector from the side of the
compressor. Using an
ohmmeter, check continuity between the points listed below. 4. Compressor
terminals C and S: No continuity indicates an open start winding. The
compressor must
be replaced. Normal start winding resistance is 3 to 7 ohms. 5. Compressor
terminals C and R: No continuity indicates an open run winding. The compresor
must be
replaced. Normal run winding resistance is .5 to 2 ohms. 6. Compressor
terminal C and compressor case: Continuity indicates a grounded motor. The
compressor
must be replaced. 7. Disconnect the wires from the run capacitor. The
capacitor is shorted and must be replaced if
continuity exists between any terminal and ground.
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INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
8. Using capacitor or MFD setting on meter test between both capacitor
terminals. Compare reading to capacitor spec on capacitor.
9. If the above test pass but the compressor does not work, the compressor
has an internal mechanical defect and must be replaced.
7.6B REPLACING A BURNT COMPRESSOR
The refrigerant and oil mixture in a compressor is chemically very stable
under normal operating conditions. However, when an electrical short occurs in
the compressor motor, the resulting high temperature arc causes a portion of
the refrigerant oil mixture to break down into carbonaceous sludge, a very
corrosive acid, and water. These contaminants must be carefully removed
otherwise even small residues will attack replacement compressor motors and
cause failures.
The following procedure is effective only if the system is monitored after
replacing the compressor to insure that the clean up was complete.
1. This procedure assumes that the previously listed compressor motor circuit
tests revealed a shorted or open winding.
2. Remove and properly dispose of the system charge. DO NOT vent the
refrigerant or allow it to contact your eyes or skin.
3. Remove the burned out compressor. Use rubber gloves if there is any
possibility of contacting the oil or sludge.
4. To facilitate subsequent steps, determine the type of burn out that
occurred. If the discharge line shows no evidence of sludge and the suction
line is also clean or perhaps has some light carbon deposits, the burn out
occurred while the compressor was not rotating. Contaminants are therefore
largely confined to the compressor housing. A single installation of liquid
and suction line filter/driers will probably clean up the system.
If sludge is evident in the discharge line, it will likely be found in the
suction line. This indicates the compressor burned out will running. Sludge
and acid have been pumped throughout the system. Several changes of the liquid
and suction filter/driers will probably be necessary to cleanse the system.
5. Correct the system fault that caused the burn out. Consult the factory for
advice.
6. Install the replacement compressor with a new capacitor and an oversized
liquid line filter.
In a running burn out, install an oversized suction line filter/drier between
the accumulator and compressor. Thoroughly flush the accumulator with
refrigerant to remove all trapped sludge and to prevent the oil hole from
becoming plugged. A standing burn out does not require a suction line
filter/drier.
7. Evacuate the system with a good vacuum pump and accurate vacuum gauge.
Leave the pump on the system for at least an hour.
8. Operate the system for a short period of time, monitoring the suction
pressure to determine that the suction filter is not becoming plugged. Replace
the suction filter/drier if pressure drop occurs. If a severe running burn out
has occurred, several filter/driers may have to be replaced to remove all of
the acid and moisture.
NOTE: NEVER use the compressor to evacuate the system or any part of it.
7.6C REPLACING A COMPRESSOR, NON BURN OUT
Remove the refrigerant from the system. Replace the compressor and liquid line
filter/drier. Charge the system to 50 PSIG and check for leaks. Remove the
charge and weigh in the refrigerant quantity listed on the nameplate. Operate
the system to verify performance.
7.7 REMOTE CONTROLS
The Quest 225 Dehumidifier is controlled by devices mounted on a panel that is
remote from the unit. You may or may not have the devices listed below
depending on the model of the remote hygrostat you purchased.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
If the Quest 225 Dehumidifier fails to operate as desired, always check the
settings of the controls to ensure that they are correct. Check that the
controls are receiving 24VAC from the Quest 225 Dehumidifier. Check the
connections between the Quest 225 Dehumidifier, the hygrostat, and the field
control wiring.
7.7A HUMIDITY CONTROL
The humidity control is an adjustable switch that closes when the relative
humidity of the air in which it is located rises to the set point. It opens
when the RH drops 4 to 6% below the set point. If the Quest 225 Dehumidifier
does not run, try turning the humidity control Down using arrow on control
pad. If it then runs, the humidity control is out of calibration or the RH is
below setpoint.
7.8 DEFROST SYSTEM
The Quest 225 Dehumidifier is equipped with an automatic defrost mechanism. If
the Quest 225 Dehumidifier operates in conditions that develop frost on the
evaporator, it will sense the frost build-up and automatically defrost the
evaporator. The Quest 225 Dehumidifier may not appear to be operating
correctly during the defrost sequence, but once the defrost sequence is
completed, the Quest 225 Dehumidifier will resume dehumidifying.
The evaporator temperature sensor is installed into the center of the
evaporator coil. It will automatically shut the compressor off if the
temperature drops due to excessive frost formation on the evaporator coil. The
impeller fan will continue to run, causing air to flow through the evaporator
coil and melt the ice. When the ice has melted, the evaporator temperature
will rise, and the control will restart the compressor.
7.9 CONDENSATE PUMP KIT
An optional condensate pump kit is available from the factory for use with the
Quest 225 Dehumidifier. Condensate is automatically pumped to a remote
location when the water level in the pump’s reservoir rises to close the float
switch.
The pump also contains a safety float switch. The white leads from this switch
extend from beneath the pump cover. These leads should be extended to the
FLOAT terminals on the terminal block and the factory float jumper removed. If
the pump fails, the safety switch opens causing the compressor to stop and
water production to cease before the reservoir overflows. E4 will be displayed
on the control panel. The Quest 225 Dehumidifier will not dehumidify until
this switch closes.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
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. QUEST 225 ERROR CODES
NAME
MACHINE DISPLAY
POSSIBLE CAUSE(S) CRITICAL?
1
RH SENSOR ERROR
Error code “E1”
Broken sensor, unplugged sensor
No Displays E1, but keeps running.
2 NOT USED
–
–
–
3
OUT OF REFRIGERANT
Error code “E3”
· compressor off · fan off
4
FLOAT SWITCH TRIPPED
Error code “E4”
· compressor off · fan off
Refrigeration leak
Yes
Tripped float switch, Loose wire
Yes
Error code “E5”
5
EVAPORATOR SENSOR ERROR
· dehu mode: 15 minutes
Broken sensor, Loose connection
No
· defrost mode: 30 minutes
6
TEMPERATURE TOO HIGH
Error code “E6”
· compressor off · fan off
Temperature too high, Broken sensor
Yes
7
TEMPERATURE TOO LOW
Error code “E7”
· compressor off · fan off
Temperature too low, Broken sensor
Yes
8 COMM ERROR
Error code “E8”
Power board continutes to run unit
HIGH PRESSURE Error code “E9″
9 CUT-OUT
Power board will be in system protection mode
RJ12 cable / connection issue
No. Displays E8, but keeps running.
Loose connection, High pressure in refrigeration system
Yes.
Display E9 on all state that the seven segment display is illuminated.
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
WIRING DIAGRAM OF THE QUEST 225 DEHUMIDIFIER
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QUEST 225
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
SERVICE PARTS LIST FOR QUEST 225
Item Part No Qty Description
1
4042787 1 MERV-13 Air Filter 2X18X18”
2 4026221 4 Leveling Foot
3 4042468 1 Filter/Drier
4 4042849 1 Compressor
5 4042800 1 Coil Cassette Assembly
6 4039988 1 Compressor Overload
7 4042845 1 Impeller Assembly*
8 4035949-10 1 Capacitor, Run, 45 MFD
- Not pictured
Item Part No Qty Description
9 4042467 1 Relay, SPST 220V, 25A 10 4034716-03 1 Thermistor Probe* 11 4042061
1 Temp RH Sensor 12 4043292 1 High Pressure Switch 13 4042903 1 Pressure Diff
Switch 14 4041909 1 Digital Display Board 15 4042291 1 Control Board 16
4042009 1 Cover, UI, 24VAC
OPTIONAL PARTS LIST
Part No
4022220 4043235
Qty Description
1 Pump Kit (110-120V) 1 Supply & Return Duct Kit
Part No 4028531
Qty Description 1 DEH 3000R Control, Remote
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INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
9 15
8
13
6 12 4 3
5 11 1 14
16
2
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INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
DO NOT DISCARD
IMPORTANT WARRANTY INFORMATION
QUEST 225 DEHUMIDIFIER LIMITED WARRANTY
WARRANTOR: Therma-Stor LLC 4201 Lien Rd Madison, WI 53704 Telephone: 1-800-533-7533
REGISTER YOUR NEW DEHUMIDIFIER using the serial number and part number at
www.thermastor.com/registration or scan code, right.
WHO IS COVERED: This warranty extends only to the original end-user of the
Quest 225 dehumidifier, and may not be assigned or transferred.
FIRST YEAR WARRANTY: Therma-Stor LLC warrants that, for one (1) year the Quest
225 dehumidifier will operate free from any defects in materials and
workmanship, or Therma-Stor LLC will, at its option, repair or replace the
defective part(s), free of any charge.
SECOND THROUGH FIFTH YEAR WARRANTY: Therma-Stor LLC further warrants that for
a period of five (5) years, the condenser, evaporator, and compressor of the
Quest 225 Dehumidifier dehumidifier will operate free of any defects in
material or workmanship, or Therma-Stor LLC, at its option, will repair or
replace the defective part(s), provided that all labor and transportation
charges for the part(s) shall be borne by the end-user.
END-USER RESPONSIBILITIES: Warranty service must be performed by a Servicer
authorized by Therma-Stor LLC. If the end-user is unable to locate or obtain
warranty service from an authorized Servicer, he should call Therma-Stor LLC
at the above number and ask for the Therma-Stor LLC Service Department, which
will then arrange for covered warranty service. Warranty service will be
performed during normal working hours.
The End-user must present proof of purchase (lease) upon request, by use of
the warranty card or other reasonable and reliable means. The end-user is
responsible for normal care. This warranty does not cover any defect,
malfunction, etc. resulting from misuse, abuse, lack of normal care,
corrosion, freezing, tampering, modification, unauthorized or improper repair
or installation, accident, acts of nature or any other cause beyond Therma-
Stor LLC’s reasonable control.
LIMITATIONS AND EXCLUSIONS: If any Quest 225 Dehumidifier part is repaired or
replaced, the new part shall be warranted for only the remainder of the
original warranty period applicable thereto (but all warranty periods will be
extended by the period of time, if any, that the Quest 225 Dehumidifier is out
of service while awaiting covered warranty service).
UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE QUEST
DEHUMIDIFIER 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 DEHUMIDIFIER 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 limitation may not apply to
you.
LEGAL RIGHTS: This warranty gives you specific legal rights, and you may also
have other rights which vary from state to state.
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QUESTCLIMATE.COM
References
- Therma-Stor | A Family of Brands Driven by Performance & Powered by Design
- Filters, Ducting and Accessories | Dehumidifiers & Air Movers | Quest
- Product Registration - Therma-Stor
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