Dectron, Inc. March 2012
DECTRON
Owner’s Manual
DSH/DSV/RSH/DBH/RBH Series Dehumidifier
Data subject to change without notice.
307
Diagnostics-Mechanical Service
Room temperature
too low
Room temperature
too high
Set point too low
• Adjust set points to values shown on unit
nameplate.
Excessive outdoor-air intake
• Adjust outdoor intake rate to no more than
15% of total airflow.
Failure of auxiliary duct heater
(by others)
• Verify proper heater operation. Correct as
necessary.
There is no space heater or
space heater has inadequate
capacity.
• The DRY-O-TRON® does not produce
significant heat - it recycles heat. A dedi-
cated space heater must be ordered with
the unit or provided by others.
NOTE: Building heat losses are calculated by
others and consequently are sized by
others. Dectron does not select space-
heater capacities.
Set point too high
• Adjust set points to values shown on unit
nameplate.
Excessive outdoor-air intake
• Adjust outdoor intake rate to no more than
15% of total airflow.
Outdoor condenser dirty or fan(s)
not operating
• Be sure heat exchangers are clean. Assure
fan operation.
Auxiliary duct heater ON with no
heating demand
• Verify proper heater operation. Correct as
necessary.
Air-conditioning diverting valve
stuck
Problems not indicated by Supervisaire
®
Controller
SYMPTOM POSSIBLE CAUSES CHECKS & CORRECTIONS
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.
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