Central Pneumatic 67696 Set Up And Operating Instructions Manual page 20

Problem
Air leak from the valve of the pressure
switch
Reduction of efficiency, frequent start-
up. Low pressure values
The motor and/or the compressor
overheat irregularly
After an attempt to start the
compressor, it stops due to tripping of
the thermal cutout caused by forcing of
the motor
During operation, the compressor
stops for no apparent reason
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
Irregular presence of oil in the network Too much oil inside the unit
Leaking of condensate from the vent
cock
TROUBLESHOOTING
Possible Cause
Check valve does not perform its
function correctly due to wear or dirt on
the seal
Condensate drainage cock open
Rilsan hose not inserted correctly in
pressure switch
Excessively high consumption
Leaks from joints and/or pipes
Clogging of the suction filter
Slipping of the belt
Insufficient ventilation
Closing of air ducts
Insufficient lubrication
Start-up with head of the compressor
charged
Low temperature
Voltage too low
Incorrect or insufficient lubrication
Inefficient electrovalve
Tripping of the thermal cutout of the
motor
Electric fault
Faulty capacitor
Wear on segments
Presence of dirt/grit inside the cock
20
Solution
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
Close the condensate drainage cock
Insert the Rilsan hose correctly inside
the pressure switch
Decrease the demand of compressed
air
Change gaskets
Clean/replace the suction filter
Check V-belt tension
Improve ambient conditions
Check and if necessary clean the air
filter
Top up or change oil
Release the compressor head by using
the pressure switch push button
Improve ambient conditions
Check that the mains voltage matches
that of the dataplate. Eliminate any
extensions
Check level, top up and if necessary
change the oil
Take compressor to the service center
Check level oil
Operate on the lever of the pressure
switch returning this to the OFF
position.
Reset the thermal cutout and restart.
If the fault persists, take the
compressor to the service center
Take compressor to the service center
Have the capacitor replaced
Check oil level
Take compressor to the service center
Clean the cock