Section 6
127
MAINTENANCE
MAINTENANCE
6.1 MAINTENANCE BY AN
ENGINEER/TECHNICIAN
1. Maintenance and repairs should only be
performed when the air dryer is shut down
and depressurized and when the main
power switch is turned OFF.
2. Use only the appropriate tools for mainte-
nance and repair.
3. Before dismantling any part that has been
pressurized, disconnect the pressure
sources and depressurize the system com-
pletely. Shut off all valves and isolate the
dryer.
4. Proceed carefully during maintenance and
repair. Prevent dirt from entering by covering
parts and orifices with a clean cloth, paper or
tape.
5. Receiver tanks should never be welded or
modified in any way.
6. Never leave tools, loose parts or cleaning
rags in or on the air dryer.
7. Before connecting the dryer back online,
check the setting of the control and safety
devices as well as the pressure and the tem-
perature of the compressed air circuit.
8. For dryers with water-cooled condensers -
End caps of water condenser can be disas-
sembled for cleaning with help of a water jet.
6.2 MAINTENANCE BY THE
USER
1. Keep the dryer clean.
2. In case of more than 4 pounds of refriger-
ant, the dryer should be regularly checked
to be leak free by qualified refrigerant
engineer. Refer to section “Environmental
protection” of this manual.
3. Every six months - check the correct opera-
tion of the condenser drain trap. Replace
timer or solenoid valve in case of clogging or
malfunctioning.
4. Every six months - check and clean the drain
strainer or the electronic sensor by undoing
the access screw and rinsing the filter with
tap water to remove the trapped dirt from the
inside.
5. Clean the air condenser with a brush or com-
pressed air as soon as it’s dirty or clogged.
Take extra care not to bend the fins of the
condenser heat exchanger.
6. Check the troubleshooting list in case of
maintenance issues.
7. Check operating pressures, temperatures
and time settings after maintenance. If oper-
ating and safety devices function properly,
the air dryer may be used.
8. For water-cooled condensers - Use only
clean water when cleaning the condenser.
Water should be jet-streamed from the outlet
side to the inlet side.
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