Aircel AHLD E-Series, Installation And Operation Manual

Page: 21 / 44

Heatless Regenerative Desiccant Air Dryer
21
Troubleshooting (cont’d)
Problem Probable Cause Remedy
Dryer Fails to
Shift Towers
Exhaust valves(s) not
functioning
Check pilot valve and pilot air supply, dismantle
and clean exhaust valve check flow 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 filter, and pilot tubing restriction.
Purge flow orifice in the
outlet APV valve may be
clogged
Dismantle outlet APV valve, and clean out the
orifice
Inlet APV valve malfunction Dismantle, clean, and reinstall
Outlet APV valve
malfunction
Dismantle, clean, and reinstall
Purge Failure
Purge muffler clogged
Remove and clean, replace if needed
Purge flow orifice in the
outlet APV valve may be
clogged
Dismantle outlet APV valve, and clean out the
orifice
Controller failure
Check, replace if needed
Exhaust valves(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 a 8-12
second time period) check control system
Pressurization
Failure
Purge flow orifice in the
outlet APV valve may be
clogged
Reduce inlet air flow
Exhaust valves(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 a 8-12
second time period) check control system