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Quest 105/155/205/ 225 Dual Installation, Operation and Maintenance Instructions
8
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5.2 External Control
The Quest Dual Dehumidifier is controlled using five terminals.
COM = 24volt AC power transformer neutral side (common with white)
FAN = Fan control
24V = transformer high side
DEHU = Dehumidification (fan and compressor) control
DMPR = 24volt AC power transformer neutral side (common with red)
* On board dehumidistat must be set to o
Between the COM/DMPR lead and the 24V leads is a 40VA transformer. This low voltage power source powers the
relay coils which control the fan and compressors. This 24VAC transformer can also be used to power HVAC assessories
external to the dehumidifier.
• To turn the dehumidifier on make contact between 24V and DEHU terminals, or turn the dehumidistat
clockwise towards drier.
• To turn the fan on make contact between 24V and FAN terminals.
• To power a 24V HVAC accessory, connect the accessory to the COM terminal and the 24V terminal.
NOTE: 18 ga wire needed between the Quest Dual dehumidifier and the external control
Quest oers two external control options
5.2A DEH 3000R
NOTE: 22 ga wire needed for sensor
Contact your dealer or call 1-877-420-1330 to order or go to www.questhydro.com/product-category/accessories.
COM
FAN
24V
DEHU
*
DMPR
24VAC
COMP FAN
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