Quest Engineering CDG 174 Manual

Installation, Operation and Maintenance InstructionsInstallation, Operation and Maintenance Instructions

– Read and Save These 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.

TS-976

02/17 Rev. A

4201 Lien Rd

Madison, WI 53704 Toll-Free 1-877-420-1330

www.QuestHydro.com info@QuestHydro.com

Speciﬁcations subject to change without notice.

Quest Dry

Quest CDG 174

Quest CDG 174 Installation, Operation and Maintenance Instructions

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Table of Contents

Safety Precautions...........................................................3

1. Speciﬁcations ............................................................ 4

2. Operation .................................................................. 4

2.1 Transporting .......................................................... 4

2.2 Location................................................................ 4

2.3 Electrical Requirements ......................................5

2.4 Condensate Removal...........................................5

2.5 Ducting..................................................................5

2.6 POWER Button...................................................5

2.7 PURGE Button ....................................................5

2.8 Humidistat ............................................................6

2.9 HOURS Button ...................................................6

2.10 DEFROST Light.................................................6

2.11 Defrost Cycle.......................................................6

2.12 Low Pressure Control .........................................6

3. Maintenance................................................................7

3.1 Air Filter.................................................................7

3.2 Storage ..................................................................7

4. Service..........................................................................7

4.1 Warranty ................................................................7

4.2 Technical Description ..........................................8

4.3Troubleshooting.....................................................8

4.4 Refrigerant Charging.........................................10

4.5 Blower Replacement..........................................10

4.6 Thermistor Replacement...................................10

4.7 Condensate Pump Replacement....................... 11

4.8 Gravity Drain Option ......................................... 11

5. Wiring Diagram......................................................... 12

6. Service Parts.............................................................. 13

Warranty ....................................................................14

Quest CDG 174 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 CDG 174.

READ AND SAVE THESE INSTRUCTIONS

• The device is designed to be installed INDOORS IN A SPACE

THAT IS PROTECTED FROM RAIN AND FLOODING.

• Install the unit with space to access the back or side panels for

maintenance and service. DO NOT INSTALL UNIT WITH THE

SERVICE PANELS INACCESSIBLE.

• Avoid directing the discharge air at people, or over the water in

pool areas.

• If used near a pool or spa; be certain there is NO chance the unit

could fall into the water, be splashed and that it is plugged into a

GFI GROUND FAULT INTERRUPT OUTLET.

• DO NOT use the device as a bench or table.

• DO NOT place the device directly on structural members. Provide

vibration isolation in order to minimize operational vibration and/or

noise.

• A drain pan MUST be placed under the unit if installed above

a living area or above an area where water leakage could cause

damage

• 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.

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1. Speciﬁcations

Part No. 4031170

Power 10 amps, 115 Vac, Grounded

Capacity 176 pints/day @ AHAM 80°F, 60% RH

Blower 380 CFM without external ducting

Cord 25’ 14ga Power Cord

Refrigerant 1 lb., 15 oz. R410a

Charge

Operating 33°F to 105°F

Range

Filters: 15.5” x 19.5” x 1.75” Pleated Media MERV-11

Duct Inlet - 12” Flex-Duct

Options: Outlet - 10” Lay-Flat

Warranty Five years;

1st year 100% of Parts and Labor

2nd-5th year 100% of Parts of sealed

refrigeration system.

Dimensions Width 20”, Depth 23”, Height 40”

Weight 135 lbs.

2. Operation

Place dehumidiﬁer inside structure, place condensate hose into a drain, or a very large container, and turn on. To decrease

drying times, make sure all windows and doors are closed to the outside and seal o the wet area from any unaected areas.

2.1 Transporting

The Quest CDG 174 must always be upright when transported by vehicle. It may be tipped on to its handle and back for

loading and moving by hand.

2.2 Location

Note the following precautions when locating the Quest CDG 174:

• It is designed to be used INDOORS ONLY.

• If used in a wet area, plug it into a GROUND FAULT INTERRUPTER.

• DO NOT use the Quest CDG 174 as a bench or table.

• It must always be used in the upright position.

• The air inlet on top and the front outlet must be at least 1 foot from walls and other obstructions to air ﬂow.

• If the humid area is very large, dehumidiﬁcation can be improved by adding an outlet duct to circulate air to stagnant

areas (see Sec. 2.5).

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2.3 Electrical Requirements

The Quest CDG 174 can be plugged into a grounded 15 Amp circuit. At 80°F, 60% RH, it draws 10 Amps. Due to the

high percentage of a 15 Amp circuit’s capacity that the unit uses, the circuit should be dedicated to running it only. Amp

draw decreases at lower loads and increases at higher loads. At extremely high loads, a 20 Amp circuit may be required.

If an extension cord is required, it must have a minimum of 12 gauge conductors if 25 feet long or less and 10 gauge

conductors if greater than 25 feet long.

2.4 Condensate Removal

The Quest CDG 174 is equipped with an internal condensate pump to remove the water that is condensed during

dehumidiﬁcation. This allows the condensate to be pumped 30’ with the attached hose. If the condensate must be

pumped more than 20 feet above the unit, a second pump must be added to relay the condensate.

2.5 Ducting

A detachable rectangular exhaust collar is supplied that will allow 10” round lay-ﬂat duct to be attached to the Quest

CDG 174 outlet.

To attach ducting to a collar, put the plastic duct end through the collar center and roll the duct end outward so that it

overlaps the outside of the collar. The duct and collar may then be quickly attached to the Quest CDG 174 by snapping

the collar over the four screws at the blower outlet.

2.6 Power Button

Press the POWER button to turn the dehumidiﬁer on or o. When starting the dehumidiﬁer the display will show the

accumulated hours. Press the POWER button again to turn the dehumidiﬁer o. The display will also power o.

2.7 Pump Purge Button

During normal operation the pump automatically cycles every four minutes. Press the PURGE button to remove

condensate manually from the reservoir. There are several ways to manually remove water from the reservoir:

1. Press the PURGE button once and the pump will run for 20 seconds

2. Press and hold the PURGE button and the pump will run for up to 30 seconds

3. Press the PURGE button while the dehumidiﬁer is powered o and the pump will run for 30 seconds.

Always manually purge the water reservoir before transport or storage. Turn o the power and allow the plugged in dehu-

midiﬁer to rest 15 minutes before the ﬁnal purge.

2.8 Humidistat

Adjust the humidistat to the desired conditioned humidity. The humidistat has a range of 20% to 70% RH. “ON” will

operate the unit continuously regardless of humidity.

2.9 Hours Button

Pressing the HOURS button displays the hour meter when the unit is turned o but plugged into power. To reset job

hours, press and hold the HOURS button for 5 seconds when the unit is operating.

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2.10 Defrost Light

The DEFROST light turns on when the unit is in defrost mode indicating when the compressor is o.

DRYING TIP: Air’s ability to absorb moisture from wet surroundings and the Quest CDG 174’s ability to remove

moisture from that air is greatly improved at higher temperatures. We recommend that the area to be dried be heated

to over 70°F if possible. Less drying time will be required and eciency will improve.

2.11 Defrost Cycle

If the evaporator coil’s refrigerant temperature drops below the defrost set point, due to excessive frost formation, the

thermistor activates the solid state control and the defrost light. The control cycles the compressor “o” and “on” by

monitoring thermistor temperature. The air mover will continue to run, causing air to ﬂow through the evaporator coil.

The air will melt the ice that formed on the evaprator.

When the air temperature and/or humidity increases, the evaporator temperature will rise and the thermistor will end the

defrost cycle restarting the compressor.

If the evaporator temperature does not reach the desired temperature, the compressor will start after 15 minutes. The

system will start a timed defrost cycle. The timed defrost cycle ensures the unit will continue to remove water from the

air in cool ambient conditions.

2.12 Low Pressure Control

If the low side refrigerant drops into a low pressure situation that may harm the compressor, the solid state controls will

sense the refrigerant conditions and shut o the compressor until the system automatically resets itself.

The solid state control monitors the refrigerant conditions to ensure the system is protecting compressor at all times.

The control protects the compressor from damage by monitoring cycles, pressures, and system performance.

3 Maintenance

3.1 Air Filter

The Quest CDG 174 is equipped with a pleated fabric air ﬁlter that must be checked regularly. The standard ﬁlter is a

MERV-11 high eciency ﬁlter. Operating the unit with a dirty ﬁlter will reduce the dehumidiﬁer’s capacity and eciency

and may cause the compressor to cycle o and on unnecessarily on the defrost control. Quest recommends changing the

ﬁlter with each grow cycle.

IMPORTANT: DO NOT operate the unit without the ﬁlter or with a less eective ﬁlter as the heat exchanger and coils

inside the unit could become clogged and require disassembly to clean.

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3.2 Storage

There are two issues to consider when the Quest CDG 174 is stored between uses and both pertain to the water trapped

in the unit: damage caused by freezing and biological growth. The eect of the trapped water can be greatly reduced if

precautions are taken to remove as much as possible before storage.

1. Use the pump purge switch (see Sec. 2.7 and Fig. 4) to reduce the water level in the reservoir.

2. Stretch the hose ﬂat to drain it completely.

If the unit will not be exposed to freezing temperatures, an alternative way to reduce biological growth is to ﬂush the unit

with a bio-fungicide that is approved for use with copper, aluminum and polyethylene. To ﬂush:

1. Run the hose to a drain.

2. Plug in the unit but do not turn it on.

3. Remove the air ﬁlter. Slowly pour a quart of the chemical through the top grille so that it drains into the black plastic

slots.

4. Hold in the pump purge switch to reduce the water level in the reservoir.

5. Flush with water.

4 Service

CAUTION: Servicing the Quest CDG 174 with its high pressure refrigerant system and high voltage circuitry presents

a health hazard that could result in death, serious bodily injury, and/or property damage. Only qualiﬁed service people

should service this unit.

4.1 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 1-800-533-7533 for warranty claim authorization and technical

assistance.

4.2 Technical Description

The Quest CDG 174 uses a refrigeration system similar to an

air conditioner’s to remove heat and moisture from incoming

air, and to add heat to the air that is discharged (see Fig. 2).

Hot, high pressure refrigerant gas is routed from the

compressor to the condenser coil (see Figure 2). The

refrigerant is cooled and condensed by giving up its heat to the

air that is about to be discharged from the unit. The refrigerant

liquid then passes through a ﬁlter/drier and capillary tubing

which cause the refrigerant pressure and temperature to drop.

It next enters the evaporator coil where it absorbs heat from

the incoming air and evaporates.

Figure 2: Refrigeration system of Quest

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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 constant pressure and temperature across the entire coil, from inlet to outlet.

The mixture of gas and liquid refrigerant enter the accumulator after leaving the evaporator coil. The accumulator prevents any

liquid refrigerant from reaching the compressor. The compressor evacuates the cool refrigerant gas from the accumulator and

compresses it to a high pressure and temperature to repeat the process.

4.3 Troubleshooting

No dehumidiﬁcation, neither hour meter display nor compressor run and POWER button does not turn ON.

1. Unit unplugged or no power to outlet

2. Defective control board

3. Loose connection in internal wiring

No dehumidiﬁcation, neither hour meter display nor compressor run with POWER button ON.

1. Defective control board

2. Loose connection in internal wiring

Some dehumidiﬁcation, air mover runs continuously but compressor only runs sporadically.

1. Unit is in defrost cycle, DEFROST light on

2. Check to make sure humidistat is set high enough

3. Defrost thermistor defective or loose

4. Loose connection in compressor circuit

5. Defective compressor overload

6. Defective compressor

7. Defective relay

8. Low refrigerant charge

No dehumidiﬁcation, air mover runs but compressor does not.

1. Bad connection in compressor circuit

2. Check to make sure humidistat is set high enough

3. Safety ﬂoat switch closed, check pump reservoir

4. Defective compressor capacitor

5. Defective compressor overload

6. Defective compressor

7. Defective control board

8. Low refrigerant charge

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Air mover does not run. Compressor runs brieﬂy but cycles on and o.

1. Loose connection in blower circuit

2. Obstruction prevents impeller rotation

3. Defective air mover

4. Defective control board.

Unit removes some water but not as much as expected.

1. Air temperature and/or humidity have dropped

2. Check to make sure humidistat is set high enough

3. Humidity meter and/or thermometer used are out of calibration

4. Unit has entered defrost cycle

5. Air ﬁlter dirty

6. Defective defrost thermistor

7. Low refrigerant charge

8. Air leak such as loose front cover

9. Defective compressor

10. Restrictive exhaust or inlet ducting

Unit runs but does not pump water.

1. Hose kinked or plugged

2. Pump motor defective

3. Pump check valve plugged

4. Bad connection in pump circuit

5. Hose disconnected internally

6. Defective control board

Unit pumps water automatically but not when PURGE button is pushed.

1. Bad connection in PURGE button circuit

2. Defective control board

Evaporator coil frosted continuously, low dehumidifying capacity.

1. Defrost thermistor loose or defective

2. Low refrigerant charge

Compressor runs with POWER button OFF.

1. Defective relay

2. Defective control board

3. Upper housing not sealed to tower

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4.4 Refrigerant Charging

If the refrigerant charge is lost due to service or leak, a new charge must be accurately weighed in. If any of the old charge is left in

the system, it must be removed before weighing in the new charge. Refer to the unit nameplate for the correct charge weight and

refrigerant type.

4.5 Blower Replacement

The blower has a PSC motor and internal thermal overload protection. If defective, the complete assembly must be replaced.

1. Unplug power cord

2. Remove the front cover

3. Remove the 5 screws attaching blower inlet ring

4. Remove the 4 screws mounting impeller to underside of base plate

5. Disconnect the blower leads

6. Reassemble the new blower using the above procedure in reverse

4.6 Thermistor Replacement

The defrost thermistor probe is inserted into the coil measuring coil temperatures and reacts accordingly.

To replace thermistor:

1. Remove top cover and ﬁlter

2. Remove 5 screws holding front ﬁlter bracket

3. Remove the ﬁlter bracket and foam block underneath

4. Remove the 4 screws holding the control panel in place

5. Pull the thermistor probe from the evaporator coil, reinsert the new probe into the existing hole

6. Route the thermistor wire along the side of the heat exchanger

7. Detach and remove old thermistor wire from board

8. Attach thermistor probe wire onto board

9. Reassemble unit

4.7 Condensate Pump Replacement

The internal condensate pump removes water that collects in the reservoir.

To replace the condensate pump:

1. Unplug the unit

2. Remove the rear skidplate

3. Unplug the pump wires from the wire harness

4. Remove the condensate hose and the screw attaching the pump bracket to the base

5. Replace the pump, hose, wiring, bolts, and cover in the reverse order

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