DUCTING
IO-DV090
IO-DV090
WWW.CLEANCOMFORT.COM
9
It is recommended that a new, separate return duct be
installed for the DV090 from a central area of the house.
If this is not possible, and if the existing system has
multiple returns, select one to disconnect from the
existing forced air system and use it for the dedicated
DV090 return. Always select a return from a central
location in the home in an area that is always open to
the rest of the home. Do not use a return from a room
that may have its door closed much of the time. If the
home in which the DV090 is to be installed has an
existing forced air HVAC system, utilize the HVAC
system to make the DV090 installation easier.
Basement Installation:
Install a separate 10" return
to the DV090 in a central area of the home. Optional:
Duct the supply from the DV090 to a 10" x 10" x 10"
tee/damper, adjusted to 20% open to the basement.
This allows the ability to discharge a variable amount of
dehumidified air into a basement that may not be well
served by the existing duct system, especially during the
summer months. Duct the other side of the tee to the air
supply of the existing HVAC system. A backdraft damper
is required in the duct between the 10" tee and the
central supply duct to prevent air from being discharged
into the basement during central fan operation. Connect
a duct from outside to the 6" collar of the DV090 if you
wish to provide ventilation air. See Figure 4.
Fresh Air Ventilation
Ventilation controls determine the time/frequency that
the unit introduces outside air into the structure.
The amount/frequency of ventilation should be based
on the size and occupancy of the residence. If you are
unsure of your ventilation air requirements or have need
for higher air flows, consult Technical Support by calling
1-855-239-2665.
Figure 5:
Attic Installation
Installation in a Basement or Crawlspace
with an Existing Forced Air HVAC System.
Crawlspace Installation:
Install a separate return to
the DV090 in a central area of the home. Optional: Duct
the supply from the DV090 to a 10" x 10" x 10" tee/damper
that is 20% open to the crawlspace if desired. Duct the
other side of the tee to the air supply of the existing HVAC
system with a backdraft damper. Connect an Insulated
duct from outside to the 6" collar of the DV090 if you wish
to provide optional ventilation air. See Figure 4.
Installation in an Attic with an Existing Forced
Air HVAC System
I
CAUTION!
ALWAYS install a catch pan with a drain or Safety Float
Switch for condensate under the DV090 in an attic
or condensate may damage the living space below.
The Safety Float Switch should be installed in series with
the field wire that connects the blue (#5) lead from the
DV090 to the blue (#5) lead on the digital control. If over-
flow occurs, this Safety Float Switch opens the compressor
control circuit and stops water production before the
catch pan overflows. The DV090 will continue to ventilate
or circulate air as normal, but will not dehumidify until this
switch closes.
The preferred method of installation is to create a separate
return for the DV090 in a central area of the structure. Duct
the supply of the DV090 to the air supply of the existing
HVAC system. Connect an insulated duct from outside to
the 6" collar of the DV090 if you wish to provide fresh make-
up air. Adjust a damper in the duct to provide the desired air
flow. Using the digital control, program the unit to bring in
the desired amount of fresh air. See Figure 5.
Figure 4:
Basement or crawlspace installation.