Technical Description - Honeywell TrueDRY DR65 Guide D'installation

Technical Description

TrueDRY DR65 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.
Troubleshooting
Troubleshooting videos are available on Honeywell's CPRO YouTube channel playlist.
CAUTION: Servicing the TrueDRY DR65 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
No dehumidification. Neither fan nor
compressor run and the ventilation
timer is OFF.
No dehumidification. Compressor
does not run but fan runs when
there is a call for dehumidification
and the ventilation control is OFF.
Fan runs when there is a call for
dehumidification and the ventilation
control is OFF, but the compressor
cycles on and off too frequently.
TrueDRY™ DR65 Dehumidification System 69-2089EFS—14
Recommended Troubleshooting Steps
1. Unit unplugged or no power to outlet.
2. Humidity control set too high or defective.
3. Loose connection in internal or control wiring.
4. Defective Compressor relay.
5. Defective control transformer.
6. Optional Condensate Pump Safety Switch open.
1. Defective compressor run capacitor.
2. Bad connection in compressor circuit.
3. Defective compressor overload.
4. Defective compressor.
5. Defrost thermostat open.
6. Optional Condensate Pump Safety Switch open.
1. Low ambient temperature and/or humidity causing unit to cycle
through defrost mode.
2. Defective compressor overload.
3. Defective compressor.
4. Defrost thermostat defective.
5. Dirty air filter(s) or airflow restricted.
6. Low refrigerant charge, causing defrost control to cycle.
7. Bad connection in compressor circuit. Fan does not run with fan
switch in either position.
STRAINER/FILTER
DRIER
CONDENSER
EVAPORATOR
COMPRESSOR
CAPILLARY
TUBES
ACCUMULATOR
M27404
13