Aircel AHLD E-Series - Page 31

Heatless Regenerative Desiccant Air Dryer | AHLD Series
31
TROUBLESHOOTING TABLE
Problem Probable Cause Remedy
Dryer Fails to Shift
Towers
Exhaust valve(s) not functioning
Check pilot valve and pilot air supply, dismantle and clean
exhaust valve. Check ow control valve attached to purge
exhaust valve actuator may not be adjusted properly (should
be adjusted so exhaust valve opens within a 8-12 second
time period).
No input power Check that dryer is on with correct voltage
Controller failure Check, replace if needed
Pilot air supply restricted Check pilot lter, and pilot tubing restriction
Purge ow orice in the outlet APV valve may
be clogged
Dismantle outlet APV valve, and clean out the orice
Input APV valve malfunction Dismantle, clean, and reinstall
Outlet APV valve malfunction Dismantle, clean, and reinstall
Purge Failure
Purge muer clogged Remove and clean, replace if needed
Purge ow orice in the outlet APV valve may
be clogged
Dismantle outlet APV valve, and clean out the orice
Controller failure Check, replace if needed
Exhaust valve(s) not functioning
Check pilot valve and pilot air supply, dismantle and clean
exhaust valve purge exhaust valve actuator may not be
adjusted properly (should be adjusted so exhaust valve
opens within an 8-12 second time period). Check control
system.
Pressurization
Failure
Purge ow orice in the outlet APV valve may
be clogged
Reduce inlet ow rate to meet dryer spec
Exhaust valve(s) not functioning
Check pilot valve and pilot air supply, dismantle and clean
exhaust valve purge exhaust valve actuator may not be