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Cod. 710.0054.02.00 rev.3A – 09.2010
7.0 MAINTENANCE
Before proceeding with maintenance, depressurize dryer and turn disconnect power supply as explain above.
ROUTINE MAINTENANCE OPERATIONS
EVERY
WEEK
EVERY
3 MONTHS
EVERY
YEAR
Verify nominal working conditions
(pressure , inlet air temperature, etc.)
Verify the correct working of all drainers installed, if necessary manually drain
pre and after filter, receiver tank (if applicable), all condensate drains before dryer
Check oil coalescing pre filter condition (not supplied with the dryer):
A. Element condition.
B. Efficiency of filter coalesced liquid discharger (manual or automatic type).
C. Replace Element
Check dust after filter condition (not supplied with the dryer):
A. Element condition
B. Replace Element (presence of possible oil traces)
Check Dryer unit:
A. Check the proper operating sequence of the dryer
B. Check discharge mufflers (must be without any oil traces)
C. Replace dessicant charge of each dryer column
During the first installation or after the replacement of desiccant charge, the dryer must
be reconditioned by operating with intercepted outlet air for about one hour.
8.0 TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSES
SOLUTION
Wet outlet air
A. Higher air flow.
B. Low inlet air pressure.
C. High inlet air temperature.
D. Desiccant charge satured with moisture or oil .
E. Lower purge air.
F. Regeneration pressure in the vessel.
A. Check operating conditions.
B. Check operating conditions.
C. Check operating conditions.
D. Check the separation and pre-filter before the dryer.
E. Check purge orifice.
F. Check (replace or clean) the purge muffler.
Operation failure
A. Power supply failure.
B. Electrovalve failure.
C. Timer failure.
A. Check the voltage, the fuses and the main switch.
B. Check the presence of signals on the solenoid
valves – Replace if necessary.
C. Check the timer – Replace if necessary.
Purge failure
A. Blocked purge air orifice .
B. Blocked muffler.
C. Timer failure.
A. Clean or replace the orifice.
B. Clean or replace the muffler.
C. Check the timer. Replace if necessary.
Pressure in the
regeneration phase
(max. 0,5 bar – 7,3 psi)
A. Depressurization valve not completely
opened.
B. Blocked discharge muffler.
A. Check valve and relative pilot valve.
B. Clean or replace mufflers.
Dryer pressure drop
A. High air flow
B. Low inlet air pressure
C. Blocked internal screens
D. Desiccant deterioration
A. Check operating conditions.
B. Check operating conditions.
C. Disassembe the dryer and clean screens.
D. Replace desiccant.
