Field Service Guide - Deltech SPX FLOW HG Series Instruction Manual

FIELD SERVICE GUIDE

Problems most frequently encountered with refrigerated dry-
ers are water downstream of the dryer and excessive pressure
drop. Most causes can be identified and remedied by following
this guide.
Closed refrigeration systems are potentially
dangerous. Work on the refrigeration system must be done
only by a competent refrigeration mechanic. Do not release
fluorocarbon refrigerants to the atmosphere. All refrigerants
must be recovered per EPA requirements. Do not smoke when
a refrigeration leak is suspected. Burning materials may decom-
pose refrigerants, forming a toxic gas or acids that may cause
serious injury and property damage. Before dismantling any
part of the dryer or compressed air system, completely vent
the internal pressure to the atmosphere.
PROBLEM
Water Downstream of Refrigerant compressor not
Dryer running.
No condensate discharging from
dryer.
Dryer inlet air temperature too
high.
Excessive Pressure Low outlet pressure.
Drop Across Dryer
Color Indicator Out of Indicator in red zone.
Green Zone
Indicator in blue zone.
6
SYMPTOM
Leak in refrigeration system.
Compressor overheated.
Compressor burned out.
Failure of drain.
Aftercooler malfunction.
Dryer undersized (may also cause
water downstream of dryer)
Dryer icing up. (check at separator)
Inlet air temperature too high.
Condenser fouled or clogged.
Inlet air temperature too high.
High ambient temperature.
Improper adjustment of expansion
valve.
Improper adjustment of expansion
valve.
Low ambient temperature.
POSSIBLE CAUSE REMEDY
Contact your local distributor.
Turn dryer off, wait 30 minutes; turn dryer on.
(Motor thermostat self-starting)
Contact your local distributor.
Dismantle and clean strainer. Repair or replace
solenoid valve.
Check aftercooler discharge temperature and
reduce to dryer design condition (120°F max)
Check airflow and dryer capacity. Reduce airflow or
resize and replace dryer.
Contact your local distributor.
Reduce aftercooler discharge temperature to design
conditions (See Engineering Data).
Clean or replace condenser.
Reduce aftercooler discharge temperature to design
conditions. (See Engineering Data)
Ventilate area.
Remove cap from the expansion valve and turn the
screw until the indicator is in the green zone.
Adjust the expansion valve until the indicator is in
the green zone.
Increase ambient temperature to design conditions.