4.2
STARTING THE COMPRESSOR
4.2.1 Your compressor is fitted with a push/pull type of ON/OFF switch.
To turn the compressor ON pull the switch knob upwards. To turn the
compressor OFF push the knob downwards (fig 3.1).
4.2.2 Check that the ON/OFF switch is in the OFF position, the regulator tap (fig 3.3)
is closed (Zero 0 bar), and tap (fig 3.5) is OFF.
4.2.3 Plug mains lead into mains supply and start the compressor by pulling the
switch knob upwards.
4.2.4 When starting the compressor for the first time, leave it running with air outlet
(fig 3.5) closed and regulator (fig 3.3) set to maximum pressure. Make sure that
pressure in the tank rises and that the compressor stops automatically when the
max. pressure value allowed - written on the specification plate and shown on
the gauge (fig 3.7) - is achieved. The compressor will now operate automatically.
The pressure switch (fig 3.2) stops the motor when the maximum tank pressure
is reached and restarts it when pressure falls below the minimum threshold -
approx. 2 bar (29psi) less than the maximum pressure.
4.2.5 Stop the compressor by pushing the switch knob (See fig 3.1) downwards. The
compressed air inside the compressor head will flow out, making the restart
easier and preventing the motor from being damaged.
DO NOT,
other than in an
emergency
,
stop the compressor by switching off the mains socket, or by pulling the plug out, as the pressure relief will not then occur
and motor damage may result upon restart.
When the compressor runs correctly and is stopped correctly there will be:
(a) a whistle of compressed air when the motor stops,
(b) a protracted whistle (about 20-25 seconds) when the compressor starts with no pressure in the tank.
4.2.6 The output pressure is regulated by the pressure regulator (fig 3.3). Turn the knob clockwise to increase pressure and anticlockwise to
reduce it . The knob can be locked at any required setting by tightening the locking ring (fig 3.4) up against the underside of the knob.
To determine the correct working pressure for any piece of equipment check the corresponding manual. When the compressor is not
being used set the regulated pressure to zero so as to avoid damaging the pressure reducer.
NOTE:
a) If the motor does not cut in and out, but runs continuously when using an air appliance, the capacity of the compressor may be
too small for the equipment or tool.
b) The larger gauge (fig 3.7) indicates the pressure inside the main tank. The smaller gauge (fig 3.6) indicates the pressure supplied
to the air equipment. Should the pressure in the main tank exceed the pre-set switch (fig 3.2) maximum, the safety valve (fig 3.8)
will activate.
o
o
WARNING!
For this reason DO NOT tamper with, or adjust, the switch or safety valve.
5. MAINTENANCE
In order to keep the compressor in good working condition, periodic maintenance is essential.
IMPORTANT! Failure to carry out maintenance tasks may invalidate the warranty on your compressor.
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WARNING! Before performing any maintenance operation, switch off the compressor, disconnect from electricity supply and
release all air from the tank.
5.1 Operations to be carried out
after the first 50 working hours:
a) Check that all bolts/nuts are tight, particularly those retaining the crank case
and cylinder head.
b) Replace the lubricating oil - see section 5.4.
5.2 Operations to be carried out daily:
a) Drain condensation by opening the valve located under the tank (fig 5). Place
a container under the valve and open the valve by turning anticlockwise.
5.3 Operations to be carried out every 100 hours
(or more frequently, if the compressor operates in a very dusty atmosphere):
a) Check oil level and, if necessary, top up.
b) Remove the filter element (fig 4.A) and clean with compressed air. (Wear eye
protection). Do not operate the compressor without the filter as foreign bodies
or dust could seriously damage the pump.
c) Check for oil leaks
5.4 Operations to be carried out every 200 hours:
a) Replace the lubricating oil. For oil specifications see 5.6.
Remove the oil filler/breather plug (see fig 2.B) then unscrew oil sight glass (fig 2.C) and drain the oil into a container.
Drain when the compressor is hot so that oil drains rapidly and completely. Incline compressor to ensure complete drainage.
Replace oil sight glass and refill through the oil filler/breather aperture. Do not overfill. Replace filler/breather plug.
b) Check the automatic cut-out at max. pressure and the automatic cut-in at 2 bar below.
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WARNING! Never mix different oils and do not use non-detergent/low quality oils as the compressor may be damaged.
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WARNING! Dispose of waste oil only in accordance with local authority requirements.
5.5 Operations to be carried out every 500 hours:
a) Replace air filter. (See fig 4.A)
b) Check all tube fittings and electrical connections.
c) Inspect pressure tank inside and out for damage or corrosion.
5.6 Recommended oils
Recommended oil for compressors, suitable for room temperatures ranging from +5°C to +25°C.
SEALEY CPO or equivalent SAE 40 compressor oil.
Room temperature below +5°C: SAE 20 compressor oil.
Approximate oil capacity: 0.16 litres.
SA2250/2.V2 - 1 - 050505
fig 3
fig 4
fig 5
