JUN-AIR OF1202 series [no cabinet] - Manual (Page 8)

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valve is operated by pulling the ring (1) or turning the screw ()
depending on the valve type.
f) Check intake filter
Check the intake filter and change it if necessary.
Remove the cover and dismount the filter.
g) Check the non-return valve
Turn off the compressor on the mains switch and pull out the
plug.
Empty the receiver for compressed air by operating the safety
valve. When the receiver is empty, the reading of the pressure
gauge is 0 bar.
Dismount the non-return valve from the receiver.
1
Disassemble the non-return valve and remove the O-ring (1)
from the piston.
Clean the non-return valve.
Mount a new O-ring and re-assemble the non-return valve.
Re-install the non-return valve.Service
Please note that all service must be carried out by a qualified
person.
Adjustment of pressure switch
The working presure has ben preset from the factory, and it is
normally not necessary to change this.
However, if it is necessary to change the preset settings, the
instructions mentioned below should be followed carefully.
Warning! The
compressor is constructed and approved for a max.
pressure as stated under Technical Specifications - do
not adjust to a higher pressure.
Higher working pressure will reduce the lifetime of the
compressor.
The compressor will stop at max. pressure (stop pressure) and
start again at min. pressure (start pressure). The difference
between max. and min. pressure is the differens pressure.
B
A
+
-
+
-
Unscrew the lid of the pressure switch. Adjust max. pressure
adjusting the two springs marked A (clockwise: higher
pressure). Adjust the two springs identically.
Adjust the differens pressure adjusting the spring marked B
(clockwise: higher differens pressure, lower start pressure.
Test of pumping time
The pumping time indicates the condition of the compressor.
Check that there are no leaks in the system.
Empty the air receiver of compressed air so that the
pressure gauge shows 0 bar.
Close the filter regulator and check that the drain valve is
closed.
Start the compressor and note the time it takes until it is
turned off again by the pressure switch. Check that the
pumping time agrees with the technical specifications for the
actual compressor system.
Please note that the pumping time in this manual is given for 0
to max pressure. Deviations from this result in deviating results.
Important!
Always test the pumping time when cold. If the
compressor is warm, the pumping time will be
considerably longer.
1.
.
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4.
Operating manual
GB