INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-820 / SD-1710
REV 1 – AUGUST 03,.2001
Page 49
SECTION 7
7.3 BACK PRESSURE IS TOO HIGH DURING REGENERATION PHASE
Possible cause Solution
•
Muffler is blocked
⇒
Replace muffler
•
Outlet check valve failed
⇒
Verify springs and bushings on valves
⇒
Verify seat o’ring is not damaged
•
Exhaust valve not fully open
⇒
Verify operation of pneumatic actuator
⇒
Verify pilot air to actuator
⇒
Verify if valve is obstructed
•
Inlet valve leaks across ports
⇒
Remove valve and test for across port
leakage
⇒
Install new seals
•
Inlet valve not fully positioned
⇒
Verify the pneumatic actuator for 90°
operation
⇒
Verify for leaks across vane of actuator
⇒
Pilot air pressure failed due to plugged pilot
filter or damaged pilot line.
Attention!
If you are not able to fix a disturbance, call
S
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Michigan City Indiana at once. A service technician
will be sent out as soon as possible!
7.4 SHORT-TERM SHUT-DOWN
* Advices
The following sequence is to be heeded when switching off the
adsorption dryer:
•
Switch off the adsorption dryer when the dryer transfers into repressurization
step, or at any time when both chambers are at full pressure.
•
Close all the shut off valves up- and downstream of dryer.
Attention!
Dryer will remain pressurized.
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