Dectron, Inc. March 2012
DECTRON
Owner’s Manual
DSH/DSV/RSH/DBH/RBH Series Dehumidifier
Data subject to change without notice.
303
Diagnostics-Mechanical Service
Problems not indicated by Supervisaire
®
Controller
SYMPTOM POSSIBLE CAUSES CHECKS & CORRECTIONS
A/C solenoid valve is stuck in
dehumidification position
The return air sensor is out of
calibration.
Unit not cooling
Verify that the three-way valve may be
jammed:
1. Force the suspect valve to operate and
check for changes in operating temperatures
and pressures. If no changes occur, then
the valve is completely jammed and must
be replaced.
2. If the unit runs fine in A/C, trips on high
pressure in dehumidification mode, and
also runs with higher than normal pressures
in A/C alone, then the three-way valve is
not shifting completely out of air condition-
ing. (This is assuming that no other cause
for a high pressure trip can be found.
• Replace the defective valve.
Verify actual air temperature and compare
with what is displayed on the controller.
• If the difference is less than 10°F
re-calibrate sensor. See configuration and
calibration page of service manual for
return air sensor calibration. If more than
10°F replace sensor.
Incorrectly adjusted head pres-
sure bypass valve ORI-6 (5/8)
Check whether the hot gas is going to
both the outdoor condenser and the reheat
coil at the same time.
• All DS units have a head-pressure valve
that allows the hot gas to circulate through
the reheat coil during air conditioning
should the head pressure exceed 325 PSIG.
This could occur on abnormally hot days
and prevents the unit from tripping on high
pressure. This valve is an ORI-6 (5/8 inch)
valve located in the compressor section of
the unit. To check the valve adjustment:
1. Close the isolation valves for the
outdoor condenser.
2. Run the unit in A/C mode.
3. The head pressure should rise to
approximately 325 PSI.
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