Quest Engineering DEH 3000

1-800-533-7533
Quest DEH 3000 Installation, Operation and Maintenance Instructions
5
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Commonuses(assumingstandardthermostatwiringcolorsasnoted):
Lock-out the A/C during dehumidier fan operation
ThiswillturnofftheA/Cwheneverthedehumidierfan
runs.
1.WiretheYellowthermostatterminaltotheNCterminal
ontheQuestDEH3000.Theinstallermustsupplythe
wiringbetweentheQuestdehumidierandthecontrol
panel.Besuretosafelyroutethecontrolwirestoprevent
damageduringinstallation.Becarefulnottocrossthe
wireswhenconnectingtheQuestdehumidierandthe
remotecontrolpanelordamagetothetransformermay
result.
2.RuntheYellowwirefromtheA/CunittotheCOM
terminalontheQuestDEH3000.
Energize the A/C central fan during dehumidier fan
operation
ToautomaticallyruntheA/CFANwhenthedehumidier
fanruns.
1.AttachasecondGreenwiretotheGreenfanwire
terminalonthethermostat.
2.ConnectthenewGreenwiretotheCOMterminalontheQuestDEH3000.
3.RunawirefromtheRedterminalonthethermostattotheNO
(NormallyOpen)terminalontheQuestDEH3000.
2.4 Dehumidier lock-OFF or lock-ON:
A/C sensor feature
Toautomaticallyactivateordeactivatethedehumidierwhentheair
conditionerruns.
Activate dehumidication when the air-conditioner is running.
A voltmeter is required for the next steps to ensure the correct wiring from
the A/C transformer is used to set up the Lock-in dehumidier function.
1.ThecommonwirefromtheexistingA/C
transformer(usuallyBlack)mustbeattachedto
the“COM”sensorterminalbetween“ON-D”and
“OFF-D”ontheDEH3000.
TIP: The common wire can be identied as the wire from
the A/C transformer that reads 0 volts between it and the
Yellow air conditioning call for cooling wire.The incorrect
wire will give a 20 to 28 volt reading.
2.AnotherYellowwiremustbeaddedtothe
thermostatYellowterminalandruntothe“OFF
D” sensorterminalontheQuestDEH3000.
A/C
Unit
Red
Green
Yellow
A/C
Unit
Red
Green
Yellow
A/C
Unit
Red
Green
Yellow
A/C
Unit
Red
Green
Yellow
ON-D
COM
OFF-D
TO A/C
TO A/C