Owners Manual DA2 Series Dehumidifier
Diagnostics Operation
Dectron, Inc. November 2009 33
Data subject to change without notice.
PROBLEM POSSIBLE CAUSES CHECKS & CORRECTIONS
cooling coil iced up
normal operation
Frosting of the cooling coil is normal with return-
air temperatures below 64°F (). There is an
automatic defrost cycle.
dirty air filters
Check the filters and replace them as necessary.
high humidity
humidistat set too high
Adjust the humidistat to normal.
air filters with too much
pressure drop
Replace with same type of filters provided with
unit.
return air relative humidity too
low
Raise humidistat set point to normal.
excessive air flow
Measure and adjust as specified on nameplate.
obstruction at return-air inlet
For un-ducted return air, there must be no
obstructions within 4 ft. (1.2m) of any point of the
return-air inlet.
(ducted units) poor return-air
ductwork
Return ducts (if any) must be as large as the
attachement flange on the unit for a minimum
length of 2.5 duct diameters before the unit. See
Installation-Ducts.
low air flow rate
Measure and adjust as specified on nameplate.
loose blower belt
Measure belt tension and tighten as necessary.
Replace worn or damaged belts.
Never open or close a sheave to adjust belt
tension. Use the jack screw only.
failure of defrost mode
Check the operation of the defrost controller and
hot-gas solenoid valve.
obstruction at return-air inlet
For un-ducted return air, there must be no
obstructions within 4 ft. (1.2m) of any point of the
return-air inlet.
(ducted units) poor return-air
ductwork
Return ducts (if any) must be as large as the
attachement flange on the unit for a minimum
length of 2.5 duct diameters before the unit. See
Installation-Ducts.
low refrigerant charge
If the refrigerant sight glass is empty or has
bubbles after 10 minutes of compressor
operation, a qualified person should check the
charge and add refrigerant as necessary.
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