21
G
B
7. POSSIBLE FAULTS AND RELATED PERMITTED REMEDIES
Request the assistance of a qualified electrician for operations on electric components (cables, motor, pressure switch, electric panel, etc).
Fault
Cause
Remedy
Air leak from the valve of the pressure switch.
Check valve does not perform its function
correctly due to wear or dirt on the seal.
Unscrew the hex-shaped head of the check
valve, clean the housing and the special rubber
disk (replace if worn). Re-assembler and tighten
carefully (
figures 15a-15b
).
Condensate drainage cock open.
Close the Condensate drainage cock.
Rilsan hose not inserted correctly in pressure
switch.
Insert the Rilsan hose correctly inside the
pressure switch (
fig. 16
).
Reduction of efficiency, frequent start-up. Low
pressure values.
Excessively high consumption.
Decrease the demand of compressed air.
Leaks from joints and/or pipes.
Change gaskets.
Clogging of the suction filter.
Clean/replace the suction filter
(
figures 11a-11b-11c-11d
).
Slipping of the belt.
Check belt tension (
fig. 14
).
The motor and/or the compressor overheat
irregularly.
Insufficient ventilation.
Improve ambient conditions.
Closing of air ducts.
Check and if necessary clean the air filter.
Insufficient lubrication.
Top up or change oil
(
figures 17a-17b-17c
).
After an attempt to start the compressor, it stops
due to tripping of the thermal cutout caused by
forcing of the motor.
Start-up with head of the compressor charged.
Release the compressor head by using the
pressure switch push button.
Low temperature.
Improve ambient conditions.
Voltage too low.
Check that the mains voltage matches that of
the dataplate. Eliminate any extensions.
Incorrect or insufficient lubrication.
Check level, top up and if necessary change
the oil.
Inefficient electrovalve.
Call the Service Center.
During operation, the compressor stops for no
apparent reason.
Tripping of the thermal cutout of the motor.
Check level oil.
Single-stage, mono-phase versions:
operate on the button of the pressure switch
returning this to the OFF position (
fig. 1a
).
Reset the thermal cutout (
fig. 2
) and restart
(
figures 1b
).
If the fault persists, call the Service Center.
Versions with delta-star starter:
operate on the button of the thermal cutout
located inside the box of the electric panel (
fig.
3c
) and restart (
fig. 6d
).
If the fault persists, call the Service Center.
Other versions:
Operate on the button of the pressure switch
returning this to the OFF position and then to
ON again (
fig. 1a-1b
).
If the fault persists, call the Service Center.
Electric fault.
Call the Service Center.
When operating, the compressor vibrates and
the motor emits an irregular buzzing sound. If it
stops, it does not restart although the sound of
the motor is present.
Single-phase motors:
faulty capacitor.
Have the capacitor replaced.
3-phase motors:
One of the phases of the 3-phase power supply
is missing due probably to blowing of a fuse.
Check the fuses inside the electric panel or the
electric box and if necessary replace those that
have been damaged (
fig. 18
).
Irregular presence of oil in the network.
Too much oil inside the unit.
Check oil level.
Wear on segments.
Call the Service Center.
Leaking of condensate from the vent cock.
Presence of dirt/grit inside the cock.
Clean the cock.
Any other type of operation must be carried out by authorized Service Centers, requesting original parts. Tampering with the machine may impair its
safety and in any case make the warranty null and void.
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Summary of Contents for 28FC404NUB012
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