Dehumidifier
Indoor Air
Return
DVP-4034748
control
Heating/AC Return Air
Backdraft
Damper
Dry Air to
Basement
Gravity
Damper
Motorized
Damper
Optional
Fresh Air
Intake
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DUCTING
IO-DV070
IO-DV070
In cold climates or areas where the outdoor dew point is
low at times, ventilation can be used to dehumidify the
home, making the DV070 capable of year-round drying.
This is accomplished by bringing the dry, low dew point air
into the home during these times. This approach is often
more economical than running the dehumidifier to remove
excess moisture from the home.
In cold climates, it is critical to adequately ventilate to
reduce the indoor humidity to avoid moisture accumulat-
ing in the wall cavities. For example; in a house that
experiences condensation on the interior surface of the
windows during the winter, increasing the amount of
ventilation will often cure the problem.
An insulated 6" diameter duct is generally sufficient to
provide up to 55 CFM of outside air. Large quantities of
outside air can impact the DV070's performance positively
or negatively, depending upon the inside and outside air
conditions.
The outside air duct should be connected to the 8" duct
connected to the front of the DV070. The amount of outside
air can be restricted by the blade damper in the 6" duct.
Fresh Air Ventilation
Ventilation controls determine the time/frequency that the
DV070 introduces outside air into the home. 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.
Installation in a Basement or Crawlspace with
an Existing Forced-Air HVAC System
It is recommended that a new, separate return duct be
installed for the DV070 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
DV070 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 DV070 is to be installed has an existing forced
air HVAC system, utilize the HVAC system to make the
DV070 installation easier.
Basement Installation:
Install a separate 8" return to
the DV070 in a central area of the home. Optional: Duct
the supply from the DV070 to an 8" x 8" x 8" 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 8" tee and the central
supply duct to prevent air from being discharged into
the basement during central fan operation. Connect an
insulated duct from outside to the 8" return duct of the
DV070 if you wish to provide ventilation air. See Figure 4.
Crawlspace Installation:
Install a separate return
to the DV070 in a central area of the home. Optional:
Duct the supply from the DV070 to an 8" x 8" x 8" 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 8" return duct of
the DV070 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 DV070
in an attic installation or condensate may damage
the living space below.
The Safety Float Switch should be installed in series
with the field wire that connects the DEHU terminal
from the DV070 to the blue (#5) lead on the digital
control. If overflow occurs, this switch opens the
compressor control circuit and stops water production
before the catch pan overflows. The DV070 will
continue to ventilate or circulate air as normal,
but will not dehumidify until this switch closes.
Figure 4