Specifications

18
Troubleshooting
WARNING!
• Beforeanyserviceormaintenance
work is performed on the high inlet
temperature series refrigerated air
dryer system, disconnect power
supply and lock out power supply
and depressurize system before
performing maintenance or service
work.
• Followproperlockout/tagout
procedures before performing
service or maintenance work.
• Priortoperformingany
maintenance on the dryer, all
personnel are strongly advised to
familiarize themselves with the
equipment by reading the entire
contents of this operation manual.
All safety procedures should be
followed prior to performing any
maintenance activity on the dryer.
If there is a problem with the high inlet temperature
series refrigerated air dryer or contamination
downstream is present, the problem may be
identified from one or more of the following
sources:
• Electrical
• Refrigeration
• Condensateremoval(drains)
• Other
Electrical
• Makecertainthatthedryerisconnected
to proper power supply in accordance with
electrical diagram provided.
• Checkelectricalbreaker/fusedisconnectto
determine if there is electrical power to the unit.
• Aquickcheckshoulddetermineifthepower
switch is turned on and the unit is running.
• Afterdeterminingthatthepowerissuppliedto
theunit,gotothenextstep.
WARNING!
• Followproperlockout/tagout
procedures before performing
service or maintenance work.
• Electricalinstallationmustbe
performed by a qualified electrician
and comply with all applicable
national and local codes.
Refrigeration
Notice: Always observe refrigerant analyzer
gauge(s) to determine if and how
refrigeration circuit is operating.
Highinlettemperatureseriesrefrigeratedair
dryerswithR-134arefrigerantshouldread28-40
psig refrigerant suction pressures while unit is
running with low or no load. If the refrigerant
gauge(s) reads more or less than the above specified
pressures troubleshoot the following:
1. Highrefrigerantreadingsgenerallyindicate:
 • Dirtycondenser-Cleanimmediately!
 • Dryernotturnedonduringairusage.
 • Overloading-Airflowmorethandryer
designed for.
 • Ifhighambienttemperature-Provide
adequate ventilation for proper cooling.
 • Condenserfan(s)notrunning-Call 
 TechnicalService.
 • Refrigerantcontroltoohigh-Adjusthot
AircelDHTSeries-Models20-125