Dectron, Inc. March 2012
DECTRON
DSH/DSV/RSH/DBH/RBH Series Dehumidifier Owner’s Manual
Data subject to change without notice.
306
Service Diagnostics - Mechanical
Problems not indicated by Supervisaire
®
Controller
SYMPTOM POSSIBLE CAUSES CHECKS & CORRECTIONS
High humidity in the
space (continued)
Dirty air filters can seriously
reduce the total airflow.
• Be sure that the unit is always operated
with clean air filters.
Room air temperature being too
high can reduce the dehumidifi-
cation effect.
• Adjust set point to range stated on unit
nameplate.
Insufficient refrigerant can reduce
the refrigeration effect. Excessive
length of tube connecting to
remote condenser (if so
equipped) can cause refrigerant
undercharge.
• Be sure there are no bubbles in the sight
glass under any conditions.
Excessive amounts of refrigerant
can reduce the refrigeration
effect.
• Be sure the right amount of refrigerant is
present.
Air-side clogging of the air reheat
heat exchanger can reduce total
airflow and heat transfer.
• Be sure the unit is only operated with clean
filters in place. Always filter any outdoor air
brought into the unit. If used in a natatorium
do not locate the return grille near a spa or
hot tub.
Reduced heat transfer of a
remote air-cooled condenser (if
so equipped) can cause exces-
sive condenser pressure.
• Be sure the remote condenser is clean and
the fans are operating properly in cooling
mode.
Non-condensable gases in the
refrigeration system can reduce
the refrigeration effect.
• Always evacuate to 250 microns of mercury
or better.
Closed manual shut-off valves
can reduce the refrigeration
effect.
• Be sure all manual valves that should be
open are open.
Clogged filter-driers can reduce
the refrigeration effect.
• If bubbles are visible in the sight glass,
measure the liquid temperature on either
side of the filter drier. A drop of more than
2°F is unacceptable.
• Replace the liquid line filter-drier.
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