DEHXXCDA1080A Whole House Dehumidifier Installation Guide
- August 13, 2024
- DEHXXCDA
Table of Contents
- DEHXXCDA1080A Whole House Dehumidifier
- Safety Considerations
- Specifications
- Set Up Dehumidifier for Installation
- Installing the Duct Collars
- Installing the Dehumidifier
- Leveling and Raising the Dehumidifier
- Installing a Condensate Pan Under the Dehumidifier
- Drain Installation
- Installing Ductwork
- Wiring
- Ventilation
- Zoning the Dehumidifier
- System Set-Up & Checkout
- Ventilation
- Start-Up and Sequence of Operation
- Service Instructions
- Troubleshooting
- Service Parts
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
DEHXXCDA
Dehumidifier with R-32 Refrigerant
DEHXXCDA1080A, DEHXXCDA1100A
Installation Manual
DEHXXCDA1080A Whole House Dehumidifier
NOTE: Read the entire Instruction Manual before starting the installation.
Safety Considerations
Improper installation, adjustment, alteration, service, maintenance, or use
can cause explosion, fire, electrical shock, or other conditions which may
cause death, personal injury or property damage. Consult a qualified
installer, service agency, or your distributor or branch for information or
assistance. The qualified installer or agency must use factory-authorized kits
or accessories when modifying this product.
Refer to the individual instructions packaged with kits or accessories when
installing.
Follow all safety codes. Wear safety glasses, protective clothing and work
gloves. Have a fire extinguisher available. Read these instructions thoroughly
and follow all warnings or cautions included in literature and attached to the
unit. Consult local building codes and the current editions of the National
Electrical Code (NEC) NFPA 70.
Recognize safety information. This is the safety-alert symbol .
When you see this symbol on the unit and in instructions manuals, be alert to
the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION.
These words are used with the safety-alert symbol. DANGER identifies the most
serious hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices which may result in minor
personal injury, product and property damage, or cause the equipment to not
operate. NOTE is used to highlight suggestions which will result in
enhanced installation, reliability, or operation.
WARNING
ELECTRICAL SHOCK HAZARD: Failure to follow this warning could result in
personal injury or death. Disconnect electrical power to the HVAC system
before proceeding.
ELECTRICAL SHOCK HAZARD: 115-volts may cause serious injury or death from
electrical shock. Disconnect and tag electrical service before starting
installation or field-service. Leave electrical service disconnected until
installation or field-service is complete.
ELECTRICAL SHOCK HAZARD: An interrupted or broken ground may cause
property damage, serious injury or death should an electrical fault occur. The
cabinet must be grounded in accordance with NEC ANSI/NFPA 70-2011 or local
codes. In Canada, refer to Canadian Electrical Code CSA C22.1.
FIRE HAZARD: Use of improper wire may cause serious injury,
property damage or death due to fire. Do not use aluminum wire for electrical
service to the dehumidifier. Use only copper wire.
IMPORTANT: It is a violation of Federal law to use this product in a
manner inconsistent with its labeling.
CAUTION
CUT HAZARD: Failure to follow this caution may result in personal injury.
Sharp metal edges can cause personal injury from cuts. Use gloves when cutting
plenum openings and handling ductwork.
CAUTION
-
Read all instructions before beginning installation.
-
Improper installation may cause property damage or injury. Installation, service, and maintenance must be performed by a qualified service technician.
-
Do not use in pool applications. Pool chemicals can damage the dehumidifier.
-
Do not use solvents or cleaners on or near the circuit board.
Chemicals can damage circuit board components. -
Wait 24 hours before running the unit if it was not shipped or stored in the upright position
-
Do not use dehumidification to prevent window condensation inthe winter. To address window condensation, use ventilation to lower indoor humidity in the winter.
-
Dropping may cause personal injury or equipment damage. Handle with care and follow installation instructions.
-
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.
-
If the supply cord is damaged, it must be replaced by a special cord or assembly available from the manufacturer or its service agent.
WARNING
RISK OF FIRE OR EXPLOSION:
- Flammable refrigerant used.
- To be repaired only by trained service personnel.
- Do not puncture refrigerant tubing.
- Store in well ventilated room without continuously operating flames or other potential ignition sources.
- Auxiliary devices which may be ignition sources shall not be installed in duct work.
- Consult Repair Manual/Owner’s Guide before attempting to service this product. All safety precautions must be followed.
- Dispose of properly in accordance with Federal or local regulations.
Specifications
Model DEHXXCDA1080A | Model DEHXXCDA1100A | |
---|---|---|
Unit Weight | 69 lbs. | 69 lbs. |
Shipping Weight | 81 lbs. | 81 lbs. |
Capacity 80°F, 60% RH Conditions | Up to 80 pints per day @ 185 CFM | Up to |
100 pints per day @ 280 CFM
Current Draw 115 VAC, Single Phase, 60Hz| 4.8A operating current| 6.7A
operating current
Dehumidifier Inlet Air Conditions| Dehumidification: 50°F – 104°F, 40°F
dew point minimum Ventilation: 40°F – 140°F, 0%RH – 99%RH (non-condensing)
Filter| MERV 8, washable
Airflow| External Static Pressure (“w.c.)| **Airflow (CFM)|
External Static Pressure (“w.c.)| ****Airflow (CFM)*
0.0| 185| 0.0| 280
0.2| 135| 0.2| 245
0.4| 85| 0.4| 210
| | 0.6*| 175
*Maximum design external static pressure.
NOTE: Rated capacity and current draw measured at 80ºF/60% RH inlet
conditions at 0.0 external static pressure.
Set Up Dehumidifier for Installation
IMPORTANT: Cut the strap securing the compressor shipping support bracket and remove the strap and shipping bracket. (Fig. 1)
Packaging Content
-
Dehumidifier
-
Inlet/Outlet Collars
-
Literature
a. Installation Instructions
b. Owner’s Manual -
Parts Bag
a. Screws (9)
b. T20 Torx Bit -
3/4” MNPT x 3/4” barbed fitting for drain connections
Control Location
The on-board control can be located on the top of the dehumidifier or can be
relocated to the front of the dehumidifier (Fig. 2) if the control cannot be
seen/accessed in the top orientation. It may also be rotated 180 degrees in
either orientation as shown in Fig. 3.
To move the control:
-
Remove the front control panel cover.
-
Remove the filter access door and filter.
-
Detach the on-board control by removing the four (4) screws around the control.
NOTE: Use one hand to support the bottom of the on-board control when removing. -
Keep the control in the unit and relocate to the front access hole.
-
Secure the control with the same four screws used to attach the control to the top of the unit.
-
Secure the control panel cover to the top of the unit.
Installing the Duct Collars
-
Use the screws in the parts bag to attach the duct collars to the inlet and outlet of the dehumidifier. The outlet collar has a backflow damper.
-
The outlet duct collar may be attached to the top or end of the unit.
Move the outlet cover to the location not being used. See Fig. 4. -
Make sure there are no bends in the ductwork coming off the outlet for a minimum of 4″. This precaution will ensure that the ductwork will not interfere with the backflow damper function.
Figure 11: Fully Ducted Installations
- Inlet Duct Collar
- Outlet Cover
- Outlet Duct Collar w/ Back Draft Damper
- End Discharge
- Move Outlet Cover and Install Outlet Duct Collar to Top Discharge Location
- Top Discharge
Installing the Dehumidifier
Dehumidifier Location
- Electrical service access and drain cleaning will require the removal of the electrical service side panel (Fig. 5). Allow sufficient space for service on this side of the unit.
- The filter can be removed from either side of the dehumidifier. Allow sufficient space for the filter to be removed and reinstalled.
- If locating the unit where it is not readily accessible (such as a crawl space, an attic or even a basement for some individuals), consider controls such as the Model 76C Dehumidifier Control, which can be mounted in the living space and wired to the dehumidifier.
- For attic installations, suspending the dehumidifier is recommended.
- Always install the dehumidifier in or above a condensate pan when locating in or above a finished space.
Closet Installations
WARNING
Closet installations are not approved with gas furnaces.
Only install dehumidifier in a closet with electric heat or a fan coil system.
NOTE: Do not install the dehumidifier underneath the fan coil in a closet
installation. Airflow can be restricted or moisture may damage the
dehumidifier.
Use the screws provided in the parts bag to attach the duct collars if desired
or required based on recommendations below:
- Where inlet space is restricted, the inlet duct collar is optional.
- When the dehumidifier requires a ducted vertical discharge, remove the top access panel and remount on the outlet of the unit. Install the outlet duct collar with backflow damper on top of the unit. (Fig. 4)
Leveling and Raising the Dehumidifier
IMPORTANT: These instructions must be followed to ensure proper draining.
Extend the dehumidifier feet by rotating clockwise until the dehumidifier is
approximately 1-1/2″ off the floor or ground. Blocks can be used for
additional height.
Use the feet to level the dehumidifier. Refer to the bubble level located on
top of the dehumidifier, the bubble must be within the outer circle to ensure
proper draining (Fig. 6). Leveling is required to ensure proper drainage from
the dehumidifier.
If installing a condensate pump to the side of the unit more elevation than
can be provided by the adjustable feet may be needed. Risers or hanging kits
are available to lift the dehumidifier higher off the floor.
- Bubble Level
- Bubble Level Detail
- 3/4″ Drain
- 0.38 Minimum – 2.00″ Maximum
Suspended Installation
If hanging the unit, use 1/4” (minimum) threaded rod and two unistruts {not
included} to support the base, just inside the leveling feet. It is
recommended that vibration isolators be placed between the unistruts and
dehumidifier base. (Fig. 7) Do not position threaded rods over filter access
doors.
Allow 3” between the unit and threaded rods on the service access to remove
the side panel if service is required. There must be a minimum clearance of
12” on one side of the unit to allow for removal of the filter.
Installing a Condensate Pan Under the Dehumidifier
Always install the dehumidifier in or above a condensate pan when locating it above a finished space. Adhere to local codes regarding draining of the condensate pan. If a condensate pump is needed, make sure it is in the condensate pan as well. Install a float switch in the condensate pan and/or use the overflow wires/terminals on the condensate pump to stop the dehumidifier should overflow occur. See Wiring to a Float Switch on page 8. The condensate pan and pump are not included with the dehumidifier and must be purchased separately.
Drain Installation
NOTE: Always install the dehumidifier in or above a condensate pan when
locating it above a finished space. Adhere to local codes regarding draining
of the condensate pan. If a condensate pump is needed, make sure it is in the
condensate pan as well. Install a float switch in the condensate pan and/or
use the overflow wires/terminals on the condensate pump to stop the
dehumidifier should overflow occur. The condensate pan is not included with
the dehumidifier and must be purchased separately.
CAUTION
Do not damage drain insert. The drain insert is a critical feature of the
dehumidifier drain management system.
WARNING
Running the dehumidifier without the drain insert can leadto condensate leaks.
Using Hard Pipe
NOTE: Remove drain insert (Fig. 8) before priming and gluing in the PVC
fitting. Replace drain insert after PVC glue has fully dried.
-
Install a 3/4″ PVC slip x 3/4″ MNPT PVC fitting to the dehumidifier and use 3/4″ nominal PVC Schedule 40 pipe to run the condensate line to the nearest floor drain or to an outside location that slopes away from the building.
-
Always maintain a constant downward slope in drain piping. Ensure that drain tubing does not interfere with removal of the side panel or filter door.
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Do not use metal fittings and only hand-tighten threaded fittings.
PTFE thread seal tape is recommended for threaded connections. -
Install a tee or three-way elbow at the dehumidifier outlet with a small, capped vertical tube (do not cement cap in place) to allow for cleaner to be poured into the drain line (Fig. 9).
-
PVC primer and cement is recommended for slip-fit connections (do not cement threaded connections).
- Cap
- Small Section of Drain Tube
- 3/4″3-Way elbow or Tee and elbow
- Condensate Drain Line
Using Flexible Tubing
-
Install the provided 3/4″ NPT x 3/4″ hose barb fitting and use 3/4″ flexible drain tubing. Hand-tighten the fitting to the dehumidifier.
PTFE thread seal tape is recommended for threaded connections. -
Always maintain a constant downward slope from the dehumidifier to the nearest floor drain or condensate pump, and do not allow soft tubing to curl up, which may result in air lock.
Installing Ductwork
-
Use insulated duct when the dehumidifier is located in an unconditioned space, such as an attic, garage or crawl space, or if connecting a fresh air duct to the dehumidifier ductwork.
-
Use zip ties, mastic, and tape as needed to seal the duct connections to the dehumidifier and to seal the insulation sleeves to prevent condensation inside the ductwork.
Connecting the dehumidifier to your HVAC system will pull air to be dehumidified from the whole home and similarly will discharge air to the whole home. Make sure the duct system pressure the dehumidifier will have to operate against does not exceed 0.4″ Water Column (WC) for Model DEHXXCDA1080A and 0.6″ WC for Model EHXXCDA1100A. Measure the system pressure when the HVAC fan is operating at the highest airflow (speed) setting.
There are not always readily available locations on the HVAC duct system for connecting 10″ ducts, and some local codes do not allow ducting to the return side of the HVAC system. If so, another option is to install just the discharge of the dehumidifier to the HVAC system or to use dedicated registers for both the inlet and discharge of the dehumidifier. -
To direct dehumidified air away from a potentially wet AC coil:
– Duct to the supply side of the HVAC system for air handler applications where air is pulled through the AC coil (see Figure 10). 1 Supply
2- Return
3 – HVAC Equipment -
Duct to the return side of the HVAC system for furnace applications where air is pushed through the AC coil. Check local codes to verify that ducting to the return side of the HVAC system is allowed (Fig. 10).
Dedicated Return to Main Return 1 – Supply
2 – Return
3 – HVAC Equipment -
Wire the dehumidifier to the HVAC system as shown in Fig. 14 and set up the dehumidifier to be disabled when the AC is running.
Use dedicated registers to duct the dehumidifier to the whole home when HVAC system ductwork is unavailable or impractical (Fig. 12).
- Air is Pulled from – Ducted Space
- Dehumidified Space
- 10 Minimum
- Dehumidified Air is Supplied to Ducted Space
- Dehumidifier
- Grill with 10″ Duct Collar (2 Places)
CAUTION
Installing the dehumidifier in the Alternate applications will result in
reduced performance based on amount of external static pressure.
1 – Air is Pulled from the Main Return Duct and Discharged to the Main Return
Duct
2 10″ Duct –
3 – 6′ Minimum
4- HVAC/Furnace
5-Air is Pulled from the Main Return Duct
6 – Model DEHXXCDA1080A- 0.4″ WC Maximum
7 Model DEHXXCDA1100A- 0.6″ WC Maximum –
8 – Air is Discharged to the Supply Duct
9- 10″ Duct
10- Plenum Box| 11- Air Handler
12- Plenum
13- Filter
14- Condensate Pan
15- 10″ Diameter Insulated Duct Both Sides
16- 24″ Minimum
17 – 6′ Minimum
18- Plenum Box or Y-Fitting
19 – Dehumidifier
---|---
- Use when both sides of the duct system are accessible (Fig. 13).
- When ducting from return to supply, the HVAC blower does not need to be running when the dehumidifier is running.
- When ducting return to supply, allow adequate space before the first branch duct to ensure the warm dehumidified air is thoroughly mixed with the HVAC system air.
- When ducting from return to return, wire the dehumidifier to the HVAC system as shown in Fig. 14 to ensure the HVAC blower runs when the dehumidifier is operating.
- Wire the dehumidifier to the HVAC system (Fig. 14) for exact wiring) and set up the dehumidifier to be disabled when the AC is running.
Wiring
No additional wiring is needed unless:
- the dehumidifier is ducted to the HVAC system
- a separate, external control such as a thermostat or dehumidistat is to be used
- a float switch, either integral to a condensate pump or mounted to th condensate pan, is used Use 18-22 AWG wire for any needed wiring.
Access the dehumidifier wiring terminals by pulling off the wiring access cover near the dehumidifier control display (Fig. 2). Snap thwiring access cover back into place after completing all wiring.
Wiring to the HVAC System
When the dehumidifier is ducted to the HVAC system, it is recommended that it
also be wired to the HVAC system as shown in Figure 20. If ducted to the HVAC
system in a return-to-return configuration, the dehumidifier must be wired to
the HVAC system to prevent short-circuiting dehumidified air directly back to
the dehumidifier inlet. In a return-to-supply ducting configuration, running
the HVAC fan with the dehumidifier ensures the warm dry air is mixed with room
air before being discharged to the home.
Optional W & Y Wiring
Wire the W and/or Y terminal to the HVAC system when using the ventilation
feature of the dehumidifier (see VENTILATION, Fig. 23).
NOTE: Only wire W if ventilation is required with outdoor temperatures
below 20°F (-7°C). (Fig. 14)
Wire the dehumidifier Y terminal to the HVAC system (Fig. 14) if it is desired
to disable the dehumidifier compressor from operating when the air
conditioning is running. See DEH W/AC in SYSTEM SET-UP on page 11 for
additional set up steps required to access this feature.
ENERGY SAVING RECOMMENDATION: Select “DEH w/AC DISABLED”. This allows the AC
unit to dehumidify first and if it does not satisfy the dehumidification
demand, the dehumidifier will run.
- Existing Wire
- New Wire
- Thermostat or Zone Control Board
- HVAC Equipment
- Optional Wires
Wiring to External or Remote Controls
The dehumidifier can be wired to an external control that senses the humidity
in the living space, such as a Model 76C Dehumidifier Control.
This is most often done when the dehumidifier is ducted to the HVAC system and
is located in a hard-to-reach location such as an attic or basement.
The Model 76C, when used as a remote control, allows the user to see the
humidity sensed by the dehumidifier and adjust the dehumidifier setting from a
remote location. This is most often used when the dehumidifier is not ducted
to the HVAC system and serves a hard-to-reach location such as a crawl space
or basement.
If using an external control, wire to the DH terminals of the dehumidifier
(Fig. 15). Most external controls use a normally open switch that closes with
a dehumidification demand, in which case leave the NC/NO switch in the NO
position. For controls that use a normally closed switch, put the NC/NO switch
in the NC position. If using the Model 76C as a remote control, wire to the {+
– A B} terminals. Refer to the installation instructions for the control being
used for wiring details.
- Use for External Control Applications
- Use for Remote Control Applications
Wiring a Float Switch
Use only if the installation includes a float switch or a condensate pump.
The dehumidifier leaves the factory with a jumper wire installed in the float
switch terminals. Remove the jumper and wire the float switch terminals to the
float switch or condensate pump overflow switch as shown in Fig. 16.
Communicating Furnaces and Fan Coils Only
- Configure the G terminal at the user interface and set fan speed. (Fig. 17)
- Wire the Gh, Rf, Cf and Y terminals from the dehumidifier to the furnace. (Fig. 18)
Ventilation
The dehumidifier can activate a normally closed damper to bring in outdoor air through a fresh air intake duct. This feature cannot be used when a Model 76C has been installed in a remote control application and should not be used in two-zone installations.
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Install the Fresh Air Inlet (FAI) duct and damper as shown in Fig. 19 and Fig. 20. 1 Air is Pulled – from Outside
2-6 Minimum
3 – HVAC/Furnace
4 – Balancing Dampers
5- Normally Closed Vent Damper 1 – Air is Pulled from Outside
2- HVAC/Furnace
3 6′ Minimum –
4 – Normally Closed Vent Damper -
Install the Outdoor Temperature Sensor (ODT) as shown in Fig. 21 and Fig. 22 – only needed if ventilation will be limited during high or low outdoor temperature conditions.
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Wire the FAI damper, HVAC equipment and outdoor temperature sensor to the dehumidifier control as shown in Fig. 23.
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Use the setup menu to ENABLE ventilation:
a. Enter the installer setup menu (page 11).
b. Press the Mode button until the words VENT DISABLE appear.
c. Press the UP or DOWN button to change to VENT ENABLE.
d. Press the Mode button and the words VENT TIMED will appear.
Press the Up or DOWN button to set temperature limits:
• TIMED: no temperature limits
• AUTO – B: Ventilation is not allowed if the ODT > 100°F or ODT < 0°F; ventilation is allowed only when the heat is on if the ODT is between 0°F and 20°F
• AUTO – C: Ventilation is not allowed if the ODT > 100°F or ODT < 0°F
• AUTO – D: Ventilation is not allowed if the ODT > 90°F; ventilation is allowed only when the heat is on if the ODT is between 0°F and 40°F
e. .Press the Mode button and then use the s or t button to set the ventilation time (minutes/hour).
f. Press the Mode button repeatedly until the word DONE appears on the display.
Whenever the heating, cooling or dehumidifier is turned on, the ventilation damper will open and bring in outdoor air. If the equipment doesn’t run for the set number of minutes, the dehumidifier will turn on the HVAC fan at the end of the hour to ensure ventilation needs are met.
Zoning the Dehumidifier
The dehumidifier can be configured to condition two independent spaces. Zoning
requires the installation of ductwork and dampers to direct air to and from
two locations. Scan the QR code for details on zoning the installation.
NOTE: Dehumidifier zoning is not recommended in HVAC zoning applications.
In this installation the dehumidifier controls the humidity in two separate
zones, a Primary and Secondary Zone. The dehumidifier will dehumidify the
Primary Zone as the first priority and will switch to the Secondary Zone after
the dehumidification needs of the Primary Zone have been satisfied.
IMPORTANT: Normally Closed dampers must be installed in the ducts serving
the Primary Zone and Normally Open dampers installed in the ducts serving the
Secondary Zone.
Required Components
- 10″ ductwork and fittings
- Grilles with 10″ duct collars
- Drain line
- 2 – Model 6510C, 10″ Normally Closed damper
- 2 – Model 6610C, 10″ Normally Open damper
- 1 – 24 VAC transformer (40 VA min.) for dampers
NOTE: KDAZK0101DHM Zoning Kit includes 2 – 6510C Dampers, 2 – 6610C Dampers and a 24VAC (40VA) transformer.
NOTE: Dehumidifier zoning is not recommended in HVAC zoning applications.
System Set-Up & Checkout
If dehumidifier installation does not include ventilation or zoning and will not be wired to an external control, remote control or the HVAC system, proceed to Installer Test Mode section on page 13.
- Check all wiring.
- Make sure the wire access cover has been snapped back onto the on-board control.
- Plug unit in and turn power switch to ON.
- The on-board control screen should display OFF. NOTE: If the display backlight is not on, the first button press (any button) will only turn on the backlight. Press the button a second time to achieve function.
- Hold the MODE button on the on-board control for 3 seconds to enter the Installer Set-up Menu.
- Navigate through the following screens to set up the dehumidifier for the installed application.
- Use the UP or DOWN arrows to select items and use MODE to switch to the next set-up option. To exit installer set-up, all options must be scrolled through using the MODE button.
- After the installer set up options have been completed, DONE will blink for 3 seconds and the control will return to the OFF screen.
Remote Control – Crawl Space/Sealed Attic
If installing in a crawl space or sealed attic with remote control, Enable
and press MODE. The installer set-up is complete, proceed to InstalleTest Mode
section on page 13. If not installing in a crawl space or sealed attic with
Model 76C remote control, press MODE to go to VENT screen selections
Ventilation
If using the dehumidifier for ventilation, Enable and press MODE to select
TIMED or AUTO. If not using the dehumidifier to bring in outdoor air, press
MODE to go to ZONE screen selections. If ventilating based on time only (no
outdoor temperature restrictions), press MODE at the VENT TIMED screen to go
to ventilation time selection screen. If ventilating with outdoor temperature
restrictions, use the UP arrow to go from VENT TIMED to VENT AUTO –B and then
the UP/DOWN arrows to select the desired ventilation mode, B, C, or D. Press
MODE to go to the ventilation time selection screen.
Vent-AUTO-B: Ventilation prevented when outdoor temperature is below 0°F and
above 100°F. Between 0°F – 20°F ventilation is only allowed during a HVAC heat
call. Vent-AUTO-C: Ventilation prevented when outdoor temperature is below 0°F
and above 100°F. Vent-AUTO-D: Ventilation prevented when outdoor temperature
is below 0°F and above 90°F. Between 0°F – 40°F ventilation is only allowed
during a HVAC heat call. Vent-AUTO-B, -C, -D modes apply outdoor temperature
limits and require an outdoor temperature sensor to be installed.
Press the UP or DOWN arrows to adjust the ventilation time per hour from 0 to
60 minutes. After selecting time, press MODE to go to the ZONE screen
selections. Zone
If installing the dehumidifier in a single zone application, select DISABLED
and press MODE to go to the EXTERNAL control screen selections.
If installing the dehumidifier in a two-zone application, use the UP or DOWN
arrows to select ENABLED and press MODE to go to the EXTERNAL control screen
selections. External Control
If using the dehumidifier on-board control select DISABLED and press MODE to
go to the dehumidification with air conditioning (DEH W/AC) screen selections.
If using a Model 76C or other external control, such as a thermostat with
dehumidifier outputs, use the UP or DOWN arrows to select ENABLED and press
MODE to go to the dehumidification with air conditioning (DEH W/AC) screen
selections. DEH W/AC
To allow dehumidification during active air conditioning, select ENABLED and
press MODE. To disable dehumidification when the air conditioning is on,
select DISABLED and Press MODE. RH Offset
An offset can be applied to the on-board humidity reading to avoid
discrepancies with other humidity measuring devices in the home. Use the UP/
DOWN arrows to select an offset from -5% to 5%. Press MODE to exit the
installer set-up screens. Installer Test Mode
If everything is properly wired, the dehumidifier and all of the wired
components will turn on and off during Installer Test Mode to demonstrate that
all are properly operating. Installer Test Mode lasts for four (4) minutes. If
the ON/OFF button is pressed during test mode, the dehumidifier will exit
Installer Test Mode and return to the OFF screen.
Dehumidification Only
If the dehumidifier is not already OFF, press the ON/OFF button to turn it
off. Press and hold the ON/OFF button and MODE buttons for 3 seconds.
The measured humidity, AIR SAMPLING and TEST will show on the display. If
wired to the HVAC system, the HVAC blower will turn on and if there is/are
damper(s) wired to the DEH DAMPER terminals of the control, the damper(s) will
energize. After three (3) minutes the dehumidifier compressor will turn on and
DEHUMIDIFYING will replace AIR SAMPLING on the control screen. After one
minute of compressor operation, all outputs will turn off and DONE will blink
for 3 seconds and then return to the OFF screen.
Start-Up and Sequence of Operation
Use the ON/OFF Power Switch near the power cord to apply power to the
dehumidifier.
Single Zone Whole House Or Stand Alone Using the Dehumidifier Control
-
Press the ON/OFF button to turn the dehumidifier control ON. The display will show the current setting, and the dehumidifier blower and HVAC blower (if wired to the HVAC system) will turn on to start sampling the air.
-
The setting will be replaced by the measured humidity and “AIR SAMPLING” will show on the display.
-
Use the UP or DOWN button to adjust the humidity setting as desired. The recommended initial setting is 59%.
-
After three (3) minutes of sampling, the measured humidity will be compared to the setting:
a. If the humidity is above the setting, the dehumidifier compressor turns on and “AIR SAMPLING” will be replaced by “DEHUMIDIFYING”. The compressor remains on until the measured humidity falls 3% RH below the setting.
b. If the measured humidity is below the setting, the blowers turn off and the display returns to showing the RH setting. -
The dehumidifier will sample again every 60 minutes, or at any time if the humidity setting is lowered.
Crawl Space Or Sealed Attic Remote Control Using Model 76C
-
Press the ON/OFF button to turn the dehumidifier control ON. “REMOTE” will show on the display to indicate that a remote control is wired to the dehumidifier.
-
At the Model 76C, press the ON button; the Model 76C will display the RH measured at the dehumidifier, and the dehumidifier blower will turn on to start sampling the air.
-
Use the UP or DOWN button on the Model 76C to adjust the dryness level as desired. The dryness levels are from 1 to 7, with 1 being least dry and 7 being most dry; the recommended initial setting is 3.
-
After three (3) minutes of sampling, the measured humidity will be compared to the setting:
a. If the humidity is above the setting, the dehumidifier compressor turns on and “ON” flashes on the Model 76C display.
b. If the measured humidity is below the setting, the dehumidifier blower turns off. -
The dehumidifier will sample again every 60 minutes, or at any time if the dryness level is increased.
Crawl Space Or Sealed Attic External Control
-
Press the ON/OFF Button to turn the dehumidifier control ON. The display will show the word EXTERNAL to indicate that an external control is to be used to control the dehumidifier.
-
At the external control, initiate a dehumidification demand. Refer to the literature provided with the external control. The dehumidifier fan and compressor, and the HVAC fan (if wired to do so) will turn on and the word DEHUMIDIFYING will appear on the display of the dehumidifier.
NOTE: When using an external control, there is a three minute delay after power-up (i.e., ON/OFF Power Switch is turned ON with unit plugged in) before the dehumidifier will respond to an external control. This prevents unanticipated, early start-up after power is applied. -
Discontinue the demand at the external control; the dehumidifier and HVAC fan will turn off.
Two Zone – Primary And Secondary
-
Press the ON/OFF button to turn the dehumidifier control ON.
Dehumidification of the Primary Zone follows the same sequence as described to the left for Single Zone, with or without a Model 76C external control installed in the Primary Zone. The dehumidifier control display will show “PRIMARY ZONE” in addition to that described to the left when sampling or dehumidifying the Primary Zone. The zone dampers are energized when sampling or dehumidifying the Primary Zone. -
The Secondary Zone uses the humidity setting on the dehumidifier control. During Secondary Zone sampling or dehumidification, the zone dampers are de-energized and the HVAC blower (if on) stops. “SECONDARY ZONE” will show on the dehumidifier control display when the Secondary Zone is either sampling or dehumidifying. If the Primary Zone had just finished a dehumidification demand, the compressor will continue to run during Secondary Zone sampling to prevent short cycling of the compressor.
The Secondary Zone is sampled immediately after the Primary Zone has finished sampling, or if there is a call for dehumidification from the Primary Zone, immediately after the call has been satisfied. When a Model 76C external control is installed, the Secondary Zone will be sampled once per hour if there has not been a call for dehumidification from the Primary Zone. Secondary Zone sampling will also occur whenever the setting on the dehumidifier control is lowered.
Service Instructions
Symbols
| |
---|---|---
Symbol ISO 7010-W021 (2011-05)| Symbol ISO 7000-1659 (2004-01)| Symbol ISO
7000-1659 (2004-01)
Warning: flammable materials| Service indicator: read technical manual|
Operator’s Manual: operating instructions
WARNING
Sealed Refrigeration System is not field serviceable!
- This appliance contains a mildly flammable A2L refrigerant.
- Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
- The appliance shall be stored (when not in use) in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or operating electric heater).
- Do not pierce or burn sealed system.
- Be aware that refrigerants may not contain odor.
CAUTION
When connected via air ducts to one or more rooms the appliance shall be
directly ducted to the space. Open areas such as false ceilings shall not be
used as a return air duct.
Approved Auxiliary Devices
Only approved auxiliary devices approved by the appliance manufacturer shall
be installed in the ductwork.
The following checks shall be applied to installations using FLAMMABLE
REFRIGERANTS:
- The ventilation machinery and outlets are operating adequately and are not obstructed.
- Marking on the equipment shall be visible and legible. Markings and signs that are illegible shall be corrected.
- When opening the ventilated enclosure for repair of electrical components, be sure to check for refrigerant leaks with a certified flammable refrigerant leak detector.
Repair initial safety checks shall include:
- Servicing the electrical system on the unit should be carried out by a qualified and licensed electrician.
- Disconnect power from the unit (unplug) before attempting service or repair.
- The capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking; that no live electrical components and wiring are exposed in case of a leak.
- There is continuity of earth bonding.
- Sealed electrical components shall be replaced, not repaired.
- Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use.
- Intrinsically safe components must be replaced if tripped.
- Replace components only with parts specified by the manufacturer. Other parts may result in the ignition of refrigerant in the atmosphere from a leak.
- Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure that the risk of ignition is minimized.
- Ensure that the area is in the open or that it is adequately ventilated before removal of the dehumidifier panels for servicing or conducting any hot work in the vicinity of the unit. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere.
- The refrigeration system is considered factory sealed and puncturing the refrigerant tubing in any way is prohibited.
- Repairing the refrigeration system shall not be performed in the field and must be done at the manufacturing facility by trained personnel.
- Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges, or any other adverse environmental effects. The check shall also consider the effects of aging or continual vibration from sources such as compressors or fans.
- If a leak is suspected, all naked flames shall be removed/extinguished.
Acceptable Leak Detection Methods
- Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used.
- Electronic leak detectors may be used to detect refrigerant leaks but must be calibrated correctly for Flammable Refrigerants. (Detection equipment shall be calibrated in a refrigerant-free area.)
- Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
- Leak detection equipment shall be set at a percentage of the Lower Flammability Limit (LFL) of the refrigerant and shall be calibrated to the refrigerant employed, and the appropriate percentage of gas (25% maximum) is confirmed.
- Leak detection fluids are also suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipework. Examples of leak detection fluids are:
– bubble method,
– fluorescent method agents.
NOTE: The use of silicon sealant can inhibit the effectiveness of some types of leak detection equipment.
Troubleshooting
Table 1 – Diagnostic Codes
When an error occurs, the Diagnostic Code (Tab l e 1) along with SERVICE
REQUIRED will be displayed on the control screen.
Use the guides on the following pages to identify and correct system faults.
Contact Technical Support before replacing the unit or any components and for
additional troubleshooting NOTICE
Troubleshooting and repair shall be performed by a qualified HVAC service
technician and all safety procedures must be followed.
Table 1 – Diagnostic Codes
Diagnostic Code | Failure Mode | Action | Reset |
---|---|---|---|
E1 | Internal Humidity or Temperature Sensor Open or Shorted | 1. Cycle |
power to clear error code.
2. If error code reoccurs, replace User Interface, Part No. 5492| Cycle Power
E2| High Refrigeration Pressure| 1. Verify that the fan works, the
backflow damper swings freely, and there is no blocked or restricted ductwork.
2. If the fault persists, call Technical Support.| Cycle Power
E3| Model 76C Remote Control Communication Loss| 1. Check connections
between Model 76C and dehumidifier control board. Terminals should be fully
inserted and secured in the control board and Model 76C control terminals.
2. If connections are correct and secure, turn off the dehumidifier and
remove the Model 76C. Use a short section of 4-wire cable to reconnect the
Model 76C to the control board. Turn the dehumidifier back on and increase the
dryness level setting on the Model 76C. If the
dehumidifier turns on, a problem exists with the wiring between the
dehumidifier and control.
3. If the dehumidifier does not turn on, call Technical Support.| Self-
Correcting
E4| Insufficient Capacity| 1. Check the frost sensor connection at the
power board. The terminal should be fully seated on the power board pins.
2. Remove the side access panel and verify that the sensor is secured to the
suction line.
3. If the sensor is connected and secured to the refrigeration line, proceed
to the next step.
4. Reset the fault by cycling power to the dehumidifier.
5. Turn the humidity setting down (below room/home humidity level) to make a
dehumidification call.
6. Allow the fan and compressor to run for approximately 10-15 minutes and
then enter diagnostic test mode by simultaneously pressing the UP button and
MODE button for 3 seconds. The LCD will display:
• the temperature measured by the internal sensor while also displaying the
words AIR SAMPLING and ON
• the humidity measured by the internal sensor while also displaying
%RH and the word ON
• the frost sensor temperature while also displaying the word ON
Scroll through these values and by using the UP or DOWN button.
7. Record values and call Technical Support.| Cycle Power
E5| High Temperature Thermistor Failure| Check the high temperature
sensor connection at the power board. The terminal should be fully seated on
the power board pins.
Remove the side access panel and verify the sensor is not damaged and
connected to the refrigeration line coming from the compressor.
If the sensor is connected and secured to the refrigeration line, it may need
to be replaced with Part No. 5484 – contact Technical Support to confirm.|
Cycle Power
E6| Low Temperature Thermistor Failure| Check the low temperature sensor
connection at the power board.
Remove the side access panel and verify the sensor is not damaged and connected to the suction line.
If the sensor is connected and secured to the refrigeration line, it may need to be replaced with Part No. 5483 – contact Technical Support to confirm.
| Cycle Power
E7| Float Switch Open| 1. Empty the condensate pan.
2. Check the float switch connection at the control board.
3. If not using a float switch, verify jumper is between float switch
terminals on dehumidifier control board.
4. If the problem persists, replace the float switch.| Self- Correcting
E8| Inlet Air Temperature Out of 50°F–104°F
Range, or Dew Point Below 40°F| 1. Verify all ductwork is properly sealed.
2. Check for air leakage that might affect the temperature or RH of the
incoming air.
3. If the air temperature is in range and the dew point is above 40°F,
contact Technical Support.| Self- Correcting
E9| Outdoor Temperature Sensor Open or Shorted| 1. Check the sensor
connection at the power board..
2. Remove the wires from the terminals and measure the
3. resistance. A short circuit will have a resistance very close to 0 Ohms
and an open circuit will have a very high resistance. Use this Ohms chart to
approximate the resistance based on outdoor
temperature.
4. If the sensor is not reading correctly, replace the sensor, Part No.
4401.| Outdoor Temperature| Resistance
---|---
O°F| 84,500 Ohms
20°F| 46,000 Ohms
40°F| 26,000 Ohms
60°F| 15,500 Ohms
80°F| 9,500 Ohms
100°F| 6,000 Ohms
Self- Correcting
Table 2 – Troubleshooting Guide
Symptom | Possible Reason | Troubleshooting Solution |
---|---|---|
Dehumidifier does not turn on/run. | No power to unit. | • Check that the |
dehumidifier is plugged in.
• Check that the power switch is turned ON.
• Check that the control is turned ON.
• Check that the circuit breaker has not tripped.
Dehumidifier blower is running but with little or no airflow.| Pressure drop
across dehumidifier is higher than 0.4″ WC for Model DEHXXCDA1080A or 0.6″ WC
for Model DEHXXCDA1100A.
| • Check dehumidifier air filter and wash or replace.
• Check for blocked ductwork and clear.
• Verify that the outlet collar with backflow damper is installed on the
outlet side of the dehumidifier.
• Check if backflow damper is blocked or stuck and remove obstruction.
Dehumidifier blower is running but compressor is not.| Float Switch open (E7
appears on display).| • If float switch is installed, check connections at
control board and empty the condensate pan.
• If no float switch is installed, check that the jumper is installed at the
float switch terminals on the control board.
Unit is defrosting.| • Frosting occurs when the incoming air is cool and dry,
normally during Spring or Fall, or the airflow is restricted. Frosting due to
cold/dry conditions is a normal part of operation and “DEFROSTING” will show
on the display. If it is not cool and dry, look for blocked ductwork or a
dirty filter.
Inlet air temperature is outside of the 50°F–104°F range or the dew point is
below 40°F and there is a demand for dehumidification.| • Verify all ductwork
is properly sealed. Dehumidification will restart by itself when the incoming
air temperature is within range and the dew point is above 40°F. E8 appears on
the display when inlet air conditions prevent operation.
When zoned, the dehumidifier damper does not open in INSTALLER TEST mode.|
Incorrect damper wiring or bad connection.| • Verify wiring between dampers
and 24 VAC transformer.
• If wired for Two Zone operation, verify that 24 VAC transformer is 40 VA
minimum.
• Check all wiring connections between dampers and control board.
• Verify the normally closed dampers are in the Primary Zone ductwork and the
normally open dampers are in the Secondary Zone ductwork.
The ventilation damper does not open when the HVAC fan is active.| Cycle time
has been met.| • The damper will not open if the ventilation time has already
been met.
ODT error or outdoor air outside of ODT range.| • Check that the ODT is wired
correctly to the dehumidifier control board and connections are secure.
• Check that the ODT is installed in the outdoor air intake according to the
setup specified in VENTILATION ON page 9.
• Remove the ODT leads from the dehumidifier control board and check the
resistance. Compare the reading with the chart on the right.| Outdoor
Temperature| Resistance
---|---
O°F| 84,500 Ohms
20°F| 46,000 Ohms
40°F| 26,000 Ohms
60°F| 15,500 Ohms
80°F| 9,500 Ohms
100°F| 6,000 Ohms
Dehumidifier is not draining properly.| Drain line blocked or unit not level.|
• Verify that the unit is level.
• Check the drain line blockages and check for a continuous downward slope.
• Verify presence and condition of drain cover insert. Clean (Refer to the
Owners Manual, Maintenance section) or replace with Part No. 5902 if missing
or damaged.
The HVAC fan turns on unexpectedly.| Dehumidifier is sampling or ventilation
in progress.| • The dehumidifier will turn on the HVAC fan during air sampling
or as needed to meet the ventilation time.
Dehumidifier is producing hot air.| Normal function.| • Air is reheated across
the condenser coil, resulting in a temperature rise between inlet and outlet.
Service Parts
No. | Part Description | Part No. |
---|---|---|
1 | EZK Filter, 13.5” x 11.875 x 1” | 5896 |
2 | Internal Control Board, Deh | 5478 |
3 | User Interface Assembly, Deh | 5492 |
4 | Wiring Access Door, Deh | 5479 |
5 | Hole Cover, UI Ctrl, Deh | 5493 |
6 | Door, Filter Access, Deh | 5897 |
7 | Outlet Duct Panel, Deh | 5495 |
8 | Backflow Damper, 10”, Deh | 5480 |
9 | Inlet Duct Panel, Deh | 5496 |
10 | Cover, Outlet, Deh | 5497 |
11 | Fan, 80pt Deh, with 6MFD Capacitor | 5898 |
Fan, 100pt Deh, with 12MFD Capacitor | 5899 | |
12 | Wire Harness, Power, Deh | 5901 |
13 | Senor, Low Temperature, Deh | 5483 |
14 | Sensor, High Temperature, Deh | 5484 |
15 | Leveling Foot, Deh | 5485 |
16 | Capacitor, Run, 50μF | 5778 |
17 | Capacitor, 6MFD, 250VAC, 80pt Deh | 5583 |
Capacitor, 12MFD, 450VAC, 100pt Deh | 5491 | |
18 | Drain Insert Drain | 5902 |
19 | Tube + Fitting | 5666 |
Not Shown
Remote Wall Control| 76C
6” Normally Closed damper| 6506C
Outdoor Temperature Sensor, Bracket, and Shield| 4401
24 VAC (10VA Min) Transformer| 4362
10″ Normally Closed Damper| 6510C
10″ Normally Open Damper| 6610C
Zoning Kit, includes: 2 – 6510C Dampers, 2 – 6610CDampers and a 24VAC (40VA)
transformer| KDAZK0101DHM
© 2024 Carrier. All rights reserved.
Edition Date: 05/24
Catalog No: IM-DEHXXCDA-04
A Carrier Company
Replaces: IM-DEHXXCDA-03
Manufacturer reserves the right to change, at any time, specifications and
designs without notice and without obligations.
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