Installation
10
DryCool HD Operator and Maintenance Manual
P00960167-1
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: An 8" check damper can be installed to prevent reverse flow
through unit. If the DRYCOOL™ HD is ducted to supply of a high static air handler the check damper may be
placed in the unit supply duct.
When using the UV option, an 8’ long minimum supply air duct is required to be connected to the
square inlet.
3.3.2. Reactivation Air Ducting
A separate set of duct connections are provided for the DRYCOOL™ HD dehumidifier for reactivation air. The
reactivation air is meant to convey water vapor captured by the desiccant wheel away from unit and outside the
structure.
The reactivation outlet connection is an 8" round connection located on the opposite side of the 12"W x 13.5"H
square supply air inlet. For total duct lengths up to 25’, use a minimum 8” diameter round or equivalent
rectangular. The duct should be brought to an outside wall or louver so that “wet” reactivation air is expelled
from the space and to the outdoors. Use a conventional dryer vent with back draft damper for penetrating wall if
infiltration is a concern.
3.3.3. Fresh
Air
Ducting
Fresh air can be brought into the structure by connecting a duct from outside to the DRYCOOL™ HD unit inlet
and by turning on the fan switch or activating the humidity control. The fresh air duct must be connected to the
return air duct of the central air system upstream of the DRYCOOL™ HD Dehumidifier. (See
Figure 3
for air
flow illustration).
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1.
Outside air is filtered before entering the building.
2.
Outside air will be dehumidified before entering if unit is running in dehumidification mode.
3.
Drawing air from outside and blowing inside aids in slightly pressurizing the structure. This helps
prevent dirty and humid air from entering elsewhere.
4.
Adequate exhaust fans are recommended in bath rooms and kitchen.
5.
Reactivation outlet
must be separated 4’ minimally
from the Fresh Air inlet.
In cold climates or areas where the outdoor dew point is low at times, ventilation can be used to dehumidify the
structure. This is accomplished by bringing the dry, low dew point air into the structure during these times. This
approach is often more economical than running the dehumidifier to remove excess moisture from the structure.
In cold climates, it is critical to adequately ventilate to reduce the inside moisture content to avoid moisture
accumulating in wall cavities. For example; in a house that experiences condensation on the interior surface of
windows during the winter, increasing the amount of ventilation will often cure the problem.
The DRYCOOL™ HD is designed to move 250 cfm. An insulated 4"diameter duct is generally sufficient to
provide up to 75 cfm of outside air. Remaining 175 cfm of return air can be mixed with this fresh air and ducted
into the supply intake of the DRYCOOL™ HD.