1-877-420-1330
50Hz Quest 70
Installation, Operation and Maintenance Instructions
8
www.QuestHydro.com
5.2 External Control
The Quest 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 turned all the way to “Humid”
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 dehumidifier and the external control
Quest offers 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.
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HU
M
ID
NO
RM
AL
D
RI
ER
OFF
ON
BEFORE TURNING ON UNIT:
1. CUT AND REMOVE ZIP TIE
2. PLUG HOLES USING
INCLUDED PLUGS
CO
M
FA
N
24V
DEHU
*
DMPR
CO
M
FA
N
24V
DEHU
*
DMPR
24VAC
COMP FAN
HONEYWELL REMOTE HUMIDISTAT
WIRING DIAGRAM
QUEST DEH 3000R CONTROL
WIRING DIAGRAM
4028531
Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
COM
FA
N
24V
DEHU
*
DMPR
W
hite
Blue
Yellow
Gr
een
Re
d
COM
FA
N
24V
DEHU
*
DMPR
COM
FA
N
24V
DEHU
*
DMPR
COM
FA
N
24V
DEHU
*
DMPR
COM
FA
N
24V
DEHU
*
DMPR
COM
FA
N
24V
DEHU
*
DMPR
COM
FA
N
24V
DEHU
*
DMPR
* NOTE: Best quality if printed in color
