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7
Vertical Installation
Install Dehumidifier—Existing Furnace or Air Handler with Fresh Air Duct
NOTE: Locate the outside air intake away from undesirable
fumes, gases or odors.
Advantages of fresh air ventilation:
■ Outside air is filtered before entering the building.
■ Outside air will be dehumidified by the dehumidifier before
entering the building.
■ Outside air entering the building through the dehumidifier
helps equalize pressure to prevent humid air from entering
the building through other means.
■ In cold climates, outside air can have a lower dew point and
can lower humidity inside the building without running the
dehumidifier.
NOTE: When using the existing duct system, the dehumidifier fan
and the existing system fan must be interlocked by using the low
voltage interlock method provided with the dehumidifier. See the
wiring diagrams in the “Electrical Connections” section.
1. Disconnect power.
2. Place the dehumidifier in final location. See “Location
Requirements.”
3. Attach ³⁄₄" PVC pipe to the condensate drain outlet. See
“Location Requirements.”
4. Run the PVC pipe to an outdoor drain. Any horizontal run of
drain pipe must have an anti-siphon vent for it to drain
properly.
5. If needed, install a condensate pump kit (optional).
6. Using a 10" duct, attach the discharge air supply on the
dehumidifier to the return air supply on the existing furnace or
air handler.
NOTE: Install ductwork in accordance with NFPA 90B
Standard for the Installation of Warm Air Heating and Air
Conditioning Systems (latest edition) and any local codes.
7. Attach the return air supply on the dehumidifier to the return
air supply on the existing furnace or air handler near the
return air grille.
NOTE: Do not draw air directly from the kitchen, bathroom,
laundry room or unconditioned isolated basement.
8. Using a 6" diameter insulated duct, attach to the return
plenum on the dehumidifier.
9. Install the outside air intake in a location away from
undesirable fumes, gases and odors.
10. Install a screened intake hood on the outside air intake duct.
Be sure screen is clear of debris at all times to ensure proper
air flow to dehumidifier.
11. Install a manual damper on the return air side of the
dehumidifier.
NOTE: If desired, a power damper may be installed.
A. Return air from house
B. Existing return air duct
C.Dehumidifier
D.To existing furnace or air handler
A
B
C
D
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
WARNING
Excessive Weight Hazard
Use two or more people to move and install
dehumidifier.
Failure to do so can result in back or other injury.