1-800-533-7533
Quest DRY 105, 155, and 205 Installation, Operation and Maintenance Instructions
7
www.QuestProtect.com
sales@QuestProtect.com
quest
Asset Protection and IAQ Solutions
quest
The inlet of the Quest Dry is the 10” diameter hole in the lter enclosure of the unit. A 10” round collar is
supplied with the unit to attach to round duct. The duct may be permanently attached to the collar. A 6”
round collar is provided with the unit to attach to the 6” hole in the lter enclosure. The 6” collar should be
capped if fresh make-up air is not desired. If fresh make-up air is desired, see Section 3.4C.
A 10” round (ovaled) collar is supplied with the unit for the outlet of the Quest Dry.
A length of exible ducting on all Quest Dry duct connections is recommended to reduce noise and
vibration transmitted to rigid ductwork in the structure.
Ducting the Quest Dry as mentioned in Sections 3.4A-3.4G requires consideration of the following points:
Duct Sizing: For total duct lengths up to 25’, use a minimum 10” diameter round or equivalent rectangular.
For longer lengths, use a minimum 12” diameter or equivalent. Grills or diffusers on the duct ends must not
excessively restrict airow.
Isolated Areas: Effective dehumidication may require that ducting be branched to isolated, stagnant areas.
Use 8” or larger diameter branch ducting to each of two or three areas, use 6” or larger to each of four or
more areas.
Connecting to existing HVAC systems: An optional 10” check damper is available from the factory to
prevent reverse ow through the Quest Dry. If the Quest Dry is ducted to the supply ducting air handler, it
is recommended that the check damper be placed in the Quest Dry supply duct. Contact the factory when
connecting to a static pressure of greater than or equal to +0.5” WG.
3.4C Ducting for Fresh Air
Fresh air can be brought into the structure by connecting an insulated duct from outside to the 6” Quest Dry
inlet and by turning on the fan switch or activating the humidity control (on units with the humidity control
panel). Activate the ventilation timer on units with the ventilating and humidity control panel to bring in
fresh air. Refer to Section 4.5 for programming instructions for the ventilation timer. Advantages of this form
of ventilation include:
1. Outside air is filtered before entering the building.
2. Outside air will be dehumidified before entering if the Quest Dry 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. It also reduces the potential for carcinogenic radon gas to
enter and provides make-up air for open combustion and exhaust devices like the clothes drier, fireplace,
and water heater.
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 dehumidier 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 the wall cavities. For example; in a structure 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 sufcient to provide up to 100 CFM of outside air. Large quantities
of outside air will either positively or negatively impact the performance of the Quest Dry, depending upon
inside and outside air conditions. Consult the factory by calling 1-800-533-7533 for recommendations
regarding the use of higher ows with your specic application.
FOR HVAC INSTALLER ONLY
