Dectron, Inc. March 2012
DECTRON
DSH/DSV/RSH/DBH/RBH Series Dehumidifier Owner’s Manual
Data subject to change without notice.
310
Service Diagnostics - Mechanical
High suction pressure
(continued)
A worn or damaged compressor
may produce less refrigerant
pumping.
• Compare compressor current to value
shown on value shown on unit nameplate.
Excessive noise
Lack of unit support isolators
allows vibration to be transmitted
to floors, etc.
• See the Installation section of this manual
for proper design.
Lack of duct isolators allows
vibration to be transmitted to the
ducts.
• See the Installation section of this manual
for proper design.
Loose blower belts and/or pulleys
can produce unexpected noise.
• Check blower belts and pulleys for proper
tension and alignment.
Improperly closed access panels
can produce a whistling noise as
air leaks into the cabinet.
• Be sure that all panels are closed tightly
and that all gaskets are in place.
An incorrectly set expansion
valve can cause liquid refrigerant
flood back to the compressor
with accompanying noise.
• Adjust the expansion valve to produce at
least 160°F compressor discharge gas
temperature.
Evaporator icing
Dirty air filters reduce airflow
• Replace dirty filters.
Low room temperature
• Adjust set points to value shown on unit
nameplate.
• Close evaporator-bypass damper when air
is below 78°F.
Low airflow
• Assure blower turns proper direction (three-
phase units only).
Low refrigerant charge
• Add refrigerant to eliminate bubbles in the
sight glass in all modes.
Improper duct design
• See the Installation section of this manual
for proper design.
• Assure blower belt tension is right.
SYMPTOM POSSIBLE CAUSES CHECKS & CORRECTIONS
Problems not indicated by Supervisaire
®
Controller
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