Aircel AHLD E-Series Installation And Operation Manual page 21

Troubleshooting (cont'd)
Problem
Dryer Fails to
Shift Towers
Purge Failure
Pressurization
Failure
Probable Cause
Exhaust valves(s) not
functioning
No input power
Controller failure
Pilot air supply restricted
Purge flow orifice in the
outlet APV valve may be
clogged
Inlet APV valve malfunction
Outlet APV valve
malfunction
Purge muffler clogged
Purge flow orifice in the
outlet APV valve may be
clogged
Controller failure
Exhaust valves(s) not
functioning
Purge flow orifice in the
outlet APV valve may be
clogged
Exhaust valves(s) not
functioning
Heatless Regenerative Desiccant Air Dryer
Remedy
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)
Check that dryer is on with correct voltage.
Check, replace if needed
Check pilot filter, and pilot tubing restriction.
Dismantle outlet APV valve, and clean out the
orifice
Dismantle, clean, and reinstall
Dismantle, clean, and reinstall
Remove and clean, replace if needed
Dismantle outlet APV valve, and clean out the
orifice
Check, replace if needed
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
Reduce inlet air flow
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
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