Troubleshooting; Electrical; Refrigeration - Aircel DHT-20 Installation And Operation Manual

Aircel DHT Series - Models 20 - 125

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
18
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