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10
Install Dehumidifier—Attic Installation
NOTES:
■ Install a secondary drain pan with a drain or float interrupt
under the dehumidifier to prevent damage to ceiling or living
space below.
■ 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. Place a secondary drain pan under the dehumidifier.
7. Using a 10" duct, attach the discharge air supply on the
dehumidifier to the return air supply on the existing lower
level 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.
8. Attach the return air supply on the dehumidifier to the return
air supply on the existing upper level 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.
9. If desired, install a fresh air duct. See “Install Dehumidifier—
Existing Furnace or Air Handler with Fresh Air Duct.”
10. If desired, install a supply air duct to the basement or crawl
space. See “Install Dehumidifier—Existing Furnace or Air
Handler with Dry Air to the Basement or Crawl Space.”
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.