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5 - 8 Troubleshooting Guide
PROBLEM/POSSIBLE CAUSE CHECKS AND REMEDY
4. Off-stream chamber’s Inlet Switching Valve
or on-stream chamber’s Purge Exhaust
Switching Valve seat is worn, damaged or
fouled (allowing slight pressure leakage to
enter regenerating chamber).
Fixed Cycle Electronic Timer Control (Mod-
els LS60 through LS1000 ONLY)
Dryer chambers fail to switch.
1. Timer failure.
2. Off-stream chamber's Inlet Switching Valve
has failed to close due to fouled or worn valve
internals.
3. Off-stream chamber Inlet Switching Valve has
failed to close due to the associated sole-
noid valve's (A or B) failure to energize. Both
chambers are at line pressure.
4. Purge Exhaust Switching Valve has failed to
close due to fouled or worn valve internals.
5. 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.
4. Shutdown and Depressurize Dryer. Refer to the Inlet Switch-
ing Valve and Purge Exhaust Switching Valve Maintenance pro-
cedures which are applicable to your specific dryer model. Dis-
assemble, clean and inspect the Inlet Switching Valves and
Purge Exhaust Switching Valves. Replace all worn or damaged
components as noted.
1a. Verify power is being supplied to dryer.
1b. Replace timer if necessary.
2. Check for pilot gas pressure at inlet valve's pilot tubing connec-
tions.
If there is pilot pressure at the off-stream chamber's pilot tubing
connection and no pilot pressure at the on-stream chamber's
pilot tubing connection, refer to the Inlet Switching Valve Mainte-
nance procedure which is applicable to your specific dryer
model.
Shutdown and Depressurize Dryer. Disassemble, clean and
inspect the Inlet Switching Valve. Replace all worn or damaged
parts as noted.
3. Repeat check #2.
If there is no pilot gas pressure present at the off-stream
chamber's pilot gas tubing connection, check voltage to solenoid
valve.
If voltage is present. De-energize Dryer Power Supply. Re-
place solenoid valve.
If voltage is not present, replace timer.
4. Check for pilot gas leak through the piston seal pilot gas exhaust
hole located on the bottom of the valve block.
If a pilot gas pressure leak is present, refer to the Purge Exhaust
Switching Valve Maintenance procedure which is applicable to
your specific dryer model.
Shutdown and Depressurize Dryer. Disassemble, clean and
inspect the Purge Exhaust Switching Valve. Replace all worn or
damaged parts as noted.
5. Shutdown and Depressurize Dryer. Refer to the Purge and
Outlet Check Valve Maintenance Procedure which is applicable
to your specific dryer model.
Disassemble, clean and inspect the Purge and Outlet Check
Valves. Replace all worn or damaged components as noted.