Troubleshooting Guide
5 - 5
b) For Models OP300 through OP500
WARNING!
Removal of the Flow restrictor should not be done un-
less the piping to the Purge Exhaust Muffler is ad-
equately supported. Failure to do so may result in se-
rious personal injury and/or equipment damage.
1.
Remove Flow Restrictor from the line and refer to the
Flow Restrictor Maintenance Procedure.
2.
Disassemble, clean, inspect and adjust as required.
Replace all worn or damaged parts as noted.
1.
Check for pilot gas pressure at off-stream chamber inlet valve’s
pilot tubing connection or on-stream chamber exhaust valve's
pilot tubing connection.
If pilot pressure is present, Shutdown and Depressurize
Dryer. Disassemble, clean and inspect the Switching Valve.
Replace all worn or damaged parts as noted.
2.
Check indicator lights at solenoid block to determine whether
energized. Indicator light should be lit if the solenoid coil is
energized. If not, open control enclosure and check MEC
Board for output signal to solenoid valve.
a) If voltage is present and the indicator at the solenoid block is
not lit, De-energize Dryer Power Supply. Press the
manual override on solenoid valve to determine if function-
ing. If functioning mechanically, the solenoid valve coil is
defective. Replace solenoid valve coil.
Note: The dryer MUST be depressurized to change coils
on a solenoid.
b) If voltage is present and the inlet valve doesn't open (mod-
els OP15 through OP300) or close (models OP400 and
OP500) when overriding the solenoid valve, the solenoid
valve is defective. Replace solenoid valve.
c) If voltage is not present, replace MEC Board.
3.
Shutdown and Depressurize Dryer. Disassemble, clean and
inspect the Purge and Outlet Check Valves. Replace all worn
or damaged components as noted.
Valve Failure Alarm with excessive pressure ex-
hausting through muffler. BOTH chamber pres-
sure gauges read below normal system pres-
sure.
1.
During Depressurization Cycle.
Off-stream chamber's Inlet Switching Valve
has failed to close due to fouled or worn
valve internals.
2.
During Depressurization Cycle.
Dryer Models OP15 through OP300
Chamber Inlet Switching Valve has failed to
close due to the associated solenoid vale's
(B or C) failure to energize.
Dryer Models OP400 and OP500
Off-stream chamber's Inlet Switching Valve
has failed to close due to the associated so-
lenoid valve's (B or C) failure to energize.
3.
During Depressurization Cycle.
Purge or Outlet Check Valve internals are
worn, damaged, or fouled, permitting
"blowby" of on-stream chamber's pressure
(through faulty check valve) to the off-
stream chamber.
PROBLEM/POSSIBLE CAUSE
CHECKS AND REMEDY
