Dectron, Inc. March 2012
DECTRON
Owner’s Manual
DSH/DSV/RSH/DBH/RBH Series Dehumidifier
Data subject to change without notice.
305
Diagnostics-Mechanical Service
Compressor will not start
(continued)
High humidity in the
space
Compressor crankcase full of
liquid refrigerant
• Be sure the crankcase heater has been
warm for at least 12 hours prior to starting
the compressor.
Low voltage may cause failure to
start
(Long inadequately-sized
branch circuit conductors may
cause low voltage at inrush.)
• Use adequate branch circuit conductors.
Consult Dectron for the use of a hard-start
kit (single phase units only).
• Consult Dectron for recommendations.
Defective start capacitor
(single phase units only)
• Replace capacitor.
Defective capacitor relay
(single phase units only)
• Replace relay.
Defective contactor
• Check that the contactor is getting power.
• Replace contactor.
Defective compressor
• Check compressor for shorts, open
windings, and locked rotor.
• Replace compressor.
Incorrect duct design can
produce stratification of room air.
See the Installation section of this manual
for proper duct design.
• Correct duct design as necessary.
Incorrect duct design can cause
improper evaporator air velocity.
Incorrect duct design can reduce
airflow below operating range.
See the Installation section of this manual
for proper duct design.
• Correct duct design as necessary.
See the Installation section of this manual
for proper duct design.
• Correct duct design as necessary.
Incorrect blower speed can
cause improper total airflow.
Assure proper total airflow by testing.
• Adjust blower speed as appropriate.
Problems not indicated by Supervisaire
®
Controller
SYMPTOM POSSIBLE CAUSES CHECKS & CORRECTIONS
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