Section 7 - Trouble Shooting Guide
PROBLEM
PROBABLE CAUSE
SOLUTION
Poor Dewpoint Performance
Low pressure on desiccant dryer.
Dryer is set to operate at 70 to 100psig.
Re-set regulator on DAP Air
Maintenance Device, or throttle outlet to
hold back pressure on dryer side to
normal settings.
Check to see that Air Maintenance
Device bypass valve has not been
opened.
Check compressor output to ensure
compressor is running normally.
Check no leaks have developed in DAP
system such as drain valve sticking
open, filter drain valves sticking open,
etc. Fix as needed
Water and/or oil in dryer.
Check coalescing filter & automatic
drain operation.
Low purge flow.
Check purge pressure setting.
Desiccant contamination.
Check compressor intake is not in an
area where chemicals can be drawn
into the intake filter with air.
Check when the last time the desiccant
was changed. Recommended
frequency of change, every 3yrs.
Check condition of desiccant.
It should be pure white. Change
desiccant if contaminated
Check condition of coalescing filter
element and drain.
High inlet temperature to dryer due to
high flow rate.
Lower flow rate from unit. Fix system
leakage.
High inlet temperature to dryer due to
high ambient temperature.
Lower ambient temperature or move
unit to area less than 100
o
F
Switchover Failure
Electric power loss
Turn dryer off; check connections to
PLC and inlet to unit.
Solenoid valve failure
Check valve operating sequence.
Replace valve.
