Installation Manual
DUCTING
IO-DV090 IO-DV090
WWW.CLEANCOMFORT.COM
8
Ducting for Fresh Air (Optional)
Fresh air may be brought into the home by connecng an
insulated duct from outside the home to the 6" inlet of
the DV090 and turning on the fan switch or acvang the
humidity control. Acvate the venlaon mer on units
with the venlang and humidity control DVP-4034748
to bring in fresh air. Refer to the Controls secon of this
manual for programming instrucons of the venlaon
mer.
Advantages of this form of venlaon include:
1. Outside air is ltered before entering the building.
2. Outside air will be dehumidied before entering if the
DV090 is running in dehumidicaon mode.
3. Drawing air from outside and blowing inside aids in
slightly pressurizing the home. This helps prevent
dirty and humid air from entering the home else-
where. It also reduces the potenal for carcinogenic
radon gas to enter and provides a small amount of
make-up air for atmospheric combuson and exhaust
devices such as a clothes dryer, replace, furnace or
water heater.
4. Exhaust fans are recommended in the bath rooms
and kitchen.
In cold climates or areas where the outdoor dew point is
low at mes, venlaon can be used to dehumidify the
home, making the DV090 capable of year-round drying.
This is accomplished by bringing the dry, low dew point
air into the home during these mes. This approach is
oen more economical than running the dehumidier
to remove excess moisture from the home.
In cold climates, it is crical to adequately venlate to
reduce the indoor humidity to avoid moisture accumulat-
ing in the wall cavies. For example; in a house that
experiences condensaon on the interior surface of the
windows during the winter, increasing the amount of
venlaon will oen cure the problem.
An insulated 6" diameter duct is generally sucient to
provide up to 75 CFM of outside air. Large quanes
of outside air can impact the DV090's performance
posively or negavely, depending upon the inside and
outside air condions.
The outside air duct should be connected to the 6" round
collar on the front of the DV090. The amount of outside
air can be restricted by the blade damper in the 6" collar.
Fresh Air/Supply Air
I
CAUTION!
DO NOT draw air directly from the kitchen, laundry,
or isolated basement. You may draw air from a
basement that is open to the home. All exible
ducng connected to the DV090 should be UL listed.
A short piece of exible ducng on ALL DV090 duct
connecons is recommended to reduce noise and
vibraon transmied to rigid ductwork in the structure.
Ducng the DV090 requires consideraon of the
following points:
Duct Sizing: For total duct lengths up to 25', use a
minimum 10" diameter round or equivalent rectangular
duct. For longer lengths, use a minimum 12" diameter
or equivalent duct. Grilles or diusers on the duct ends
must not excessively restrict airow.
Isolated Areas: Eecve dehumidicaon may require
that ducng be branched to isolated, stagnant air ow
areas. Use 8" or larger diameter branch ducng to each
of two or three areas, use 6" or larger to each of four or
more areas. Provisions must be made to provide airow
from supply locaons to central return locaon. Proper air
distribuon is important to ensure even humidity control
and heat distribuon throughout the home.
Connecting to existing HVAC systems: An oponal
10" gravity backdra damper is available to prevent re-
verse air ow through the DV090. If the DV090 is ducted
to the supply of an air handler, the backdra damper
should be placed in the DV090 supply duct. Venlaon
operaon is controlled by the digital control oered with
the DV090. These controls determine the me/frequency
that the unit introduces outside air into the HVAC
system. The amount of outside air can be restricted by
the blade damper in the 6" collar. Some control opons
require a 6" motorized damper be installed in the 6"
fresh air duct.
I
CAUTION!
Do not connect with a stac pressure greater than
or equal to +.5 WG. Contact Technical Support at
1-855-239-2665 for addional details.