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Technical Description
DR65A3000 uses a refrigeration system similar to an air
conditioner to remove heat and moisture from incoming
air and add heat to the air that is discharged. Hot, high-
pressure refrigerant gas is routed from the compressor to
the condenser coil. The refrigerant is cooled and condensed
by giving up its heat to the air that is about to be discharged
from the unit. The refrigerant liquid then passes through a
filter drier and capillary tubing which causes the refrigerant
pressure and temperature to drop. It next enters the
evaporator coil where it absorbs heat from the incoming
air and evaporates. The evaporator operates in a flooded
condition, which means that all the evaporator tubes
contain liquid refrigerant during normal operation. A flooded
evaporator should maintain nearly constant pressure and
temperature across the entire coil, from inlet to outlet.
Defrost
If the DR65 dehumidifier coil starts to freeze up it goes into defrost mode. The dehumidifier shuts off the
compressor and runs the fan until the coil temperature rises. For rev 2 models (a sideways 2 after the model number
on the sticker) the dehumidifier makes a single beep when first powered up or when it enters defrost mode.
Troubleshooting
Troubleshooting videos are available on the Resideo Pro YouTube channel playlist.
CAUTION: Servicing the DR65A3000 with its high pressure refrigerant system and high
voltage circuitry presents a health hazard which could result in death, serious bodily injury,
and/or property damage. Service should only be performed by a qualified service technician.
Problem
Neither the dehumidifier fan nor
compressor run when the control
is calling for dehumidification.
12
Troubleshooting Steps/Possible Causes of Issue
1. Bypass any external control (if used) by turning the control
knob on DR65 to "ON". If that works, and an external control is
used, troubleshoot the control and wiring to the R and DHUM
on DR65.
2. Verify the drain line is not clogged. An internal float switch can
lock out the dehumidifier if the drain line gets clogged.
3. Wait 5 minutes from the time you made the call for dehumidity.
Series 2 versions of the DR65 have a 2-5 minute compressor
protection delay. If the control is digital, it may also have a
delay. These delays will overlap, so if the humidity control has
been calling for over 5 minutes and power has not cycled, the
dehumidifier should run.
4. If it does not run after the delay, install a jumper between the
R and DHUM terminals on the dehumidifier. This bypasses the
control circuit. If the unit runs, the issue was with the control or
wires to the control.
5. If the unit still does not run within 5 minutes of installing a
jumper from R to DEHUM, verify voltage to the outlet that
the dehumidifier is plugged into. This should be 120 VAC
nominal and if it drops below 102 VAC or above 132 VAC, the
dehumidifier will not run.
Note: Be sure to remove the jumper after testing.
DR65A3000 Dehumidification System 33-00297EFS—15
STRAINER/FILTER
DRIER
CONDENSER
EVAPORATOR
COMPRESSOR
CAPILLARY
TUBES
ACCUMULATOR
M27404
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