Gardner Denver DPB Series Instruction Manual page 33

SYMPTOM
High Pressure Alarm
Left Tower or Right Tower Re-
generating
Low Pressure Alarm
Left Tower or Right Tower Re-
generating
Temperature Under-Range
or
Temperature Over-Range
Alarm
Left Tower or Right Tower
Dew Point Under-Range
or
Dew Point Over-Range Alarm
Left Tower or Right Tower Re-
generating
POSSIBLE CAUSE(S)
1. Faulty regenerating tower pressure
switch
2. Regenerating tower Depressurization
Muffler clogged.
3. Regenerating tower Depressurization
Valve failed to open.
4. Regenerating tower purge exhaust pip-
ing obstructed.
5. Regenerating tower Purge Exhaust
Valve failed to open.
6. Repressurization valve (V11) failed to
close.
1. Faulty left tower pressure switch.
2. Regenerating tower Purge Exhaust
Valve failed to close.
3. Regenerating tower Depressurization
Valve failed to close.
4. Repressurization valve (V11) failed to
open.
5. Repressurization orifices are blocked.
1. Tower temperature sensor failure.
Under-Range è Short circuit on sensor
Over-Range è Open circuit on sensor
1. Energy Management temperature sen-
sor (RTD4) failure.
CORRECTIVE ACTION
1. Check pressure switch operation using tower pressure
gauge for comparison. Replace switch if defective.
2. Examine inner core and clean or replace as necessary.
3. Check valve operation. Repair or replace as possible.
4. Ensure piping is free of obstructions.
5a. Check for loss of pilot air - ensure manual drain valve on
bottom of pilot air filter is fully closed, ensure pilot air filter
cartridge is not clogged, ensure pilot air shut-off valve is
open.
5b. Check for purge pilot air solenoid valve failure. Check valve
operation. Repair or replace as necessary.
5c. Check for regenerating tower Purge Exhaust Valve failure -
examine valve and actuator for damage. Repair or replace
as necessary.
6a. Check for loss of pilot air - ensure manual drain valve on
bottom of pilot air filter is fully closed, ensure pilot air filter
cartridge is not clogged, ensure pilot air shut-off valve is
open.
6b. Check for Repressurization Valve (V11) failure. Check valve
operation. Repair or replace as necessary.
1. Check pressure switch operation using tower pressure
gauge for comparison. Replace switch if defective.
2a. Check for air flow out of regenerating tower Purge Valve or
exhaust piping indicating valve is not completely closed.
2b. Check for loss of pilot air - ensure manual drain valve on
bottom of pilot air filter is fully closed, ensure pilot air filter
cartridge is not clogged, ensure pilot air shut-off valve is
open
2c. Check for purge pilot air solenoid valve failure. Check valve
operation. Repair or replace as necessary.
2d. Check for regenerating tower Purge Exhaust Valve failure -
examine valve and actuator for damage. Repair or replace
as necessary.
3. Check for air flow out of regenerating tower Depressur-
ization Muffler indicating valve is not completely closed.
Repair or replace as necessary.
4a. Check for loss of pilot air - ensure manual drain valve on
bottom of pilot air filter is fully closed, ensure pilot air filter
cartridge is not clogged, ensure pilot air shut-off valve is
open.
4b. Examine repressurization valve (V11) for damage. Repair
or replace as necessary.
5. Check orifices for obstruction and clean as necessary.
1. Check temperature circuit for continuity. Repair or replace
as necessary.
1. Check temperature circuit for continuity. Repair or replace
as necessary.
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