Maintenance; Troubleshooting - Fini AF 250 Use And Maintenance Manual

7.0 MAINTENANCE

Before proceeding with maintenance, depressurize dryer and turn disconnect power supply as explain above.
ROUTINE MAINTENANCE OPERATIONS
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
A. Higher air flow.
B. Low inlet air pressure.
C. High inlet air temperature.
Wet outlet air
D. Desiccant charge satured with moisture or oil .
E. Lower purge air.
F. Regeneration pressure in the vessel.
A. Power supply failure.
Operation failure B. Electrovalve failure.
C. Timer failure.
A. Blocked purge air orifice .
Purge failure B. Blocked muffler.
C. Timer failure.
Pressure in the A. Depressurization valve not completely
regeneration phase opened.
(max. 0,5 bar – 7,3 psi) B. Blocked discharge muffler.
A. High air flow
B. Low inlet air pressure
Dryer pressure drop
C. Blocked internal screens
D. Desiccant deterioration
POSSIBLE CAUSES
5 / 25
EVERY EVERY
WEEK 3 MONTHS
SOLUTION
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.
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.
A. Clean or replace the orifice.
B. Clean or replace the muffler.
C. Check the timer. Replace if necessary.
A. Check valve and relative pilot valve.
B. Clean or replace mufflers.
A. Check operating conditions.
B. Check operating conditions.
C. Disassembe the dryer and clean screens.
D. Replace desiccant.
Cod. 710.0054.02.00 rev.3A – 09.2010
EVERY
YEAR