1-877-420-1330
Quest 105/155/205/225 Dual
Installation, Operation and Maintenance Instructions
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www.QuestHydro.com
4.5 Ducting
4.5A Supply Duct Kit (P/N 4028607)
A factory designed supply duct kit can be purchased to accept 10” ducting to both outlets of the Quest Dual. Contact
your dealer or call 1-877-420-1330 to order or go to www.questhydro.com/product-category/accessories.
4.5B Return Duct Kit (P/N 4028610)
A factory designed return duct kit can be purchased to accept 12” ducting. Contact your dealer or call 1-877-420-1330
to order or go to www.questhydro.com/product-category/accessories.
5. Control Options
The Quest Dual Dehumidifier can be controlled by its on board dehumidistat or with an external control using its low
voltage terminal block.
5.1 On board dehumidistat
The humidity control is an adjustable switch that closes when the relative humidity of the air in which it is located rises to
the dial set point. It opens when the RH drops 4 to 6% below the set point.
Approximate Humidity Levels Per Setting
“Dry”
20% to 30% Relative Humidity
“Normal”
50% Relative Humidity (Recommended)
“Humid”
80% to 90% Relative Humidity
The dehumidifier will run until the relative humidity (RH) is reduced to the humidity control dial setting.
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