Sullair DEX Series User & Service Manual page 36

DEX HEATED REGENERATIVE DRYER
Symptom
Vessel #2 Re-pressurization
Low operating pressure during
regeneration
Regeneration heater sheath over
temperature failure
36
Probable Cause
The re-pressurization valve did not
open.
Vessel re-pressurized but the
alarm is on.
Compressor not running
System manual inlet isolation valve
closed.
Defective or open circuit
thermocouple.
Low or no regeneration blower
flow.
Defective temperature switch.
Remedy
Check the pilot solenoid valve for correct
operation. Check the valve actuator for
correct operation.
Check pressure switch PSH-2 for correct
operation.
Check compressor for operation
Check all manual valves upstream of the
dryer and open as required.
Replace the thermocouple.
Check the regeneration blower, motor,
motor overloads and inlet filter. Replace as
necessary.
Replace the temperature switch.
SECTION 6