SA9925/2 & /2.5 & SA9950/2.5 - 1069 - (1) - 070601
4. OPERATION
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 para 5.4.
5.2.
Operations to be carried out daily:
a) Drain condensation by opening the valve located under the tank. 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.2) and clean by blowing through, with an air line at low pressure, from
the clean side or wash in soapy water, rinse and dry. 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 5.7.
Remove the oil filler plug A and unscrew sight glass B, draining 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 sight glass and refill through the filler aperture. Do not overfill. Replace plug A.
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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.
b) Check the automatic cut-out at max. pressure and the automatic cut-in at 2 bar below.
5.5.
Operations to be carried out every 500 hours:
a) Replace air filter.
After completing the preparation the compressor is ready to operate.
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IMPORTANT
1.
The use of extension leads to connect these compressors to the mains is not recommended since the resulting voltage drop
would reduce motor, and therefore pump, performance.
2.
Take care when selecting tools for use with the compressor. Air tool manufacturers normally express the volume of air
required to operate a tool in cubic feet per minute (cfm). This refers to free air delivered by the compressor (air out) which
varies according to the pressure setting. Do not confuse this with the compressor displacement which is the air taken in by
the compressor (air in). Air out is always less than air in - due to losses within the compressor - and so it is important that,
before choosing equipment, you study the Free Air Delivery figures shown in the Specification chart, section 2.
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WARNING! Ensure that you have read, understood and apply Section 1 safety instructions.
4.1.
Make sure the main switch (fig.4.1) is in position "O, off.
4.2.
Plug mains lead into mains supply and start compressor by turning the main switch (1) to I, on.
4.3.
When starting the compressor for the first time, leave it running with air outlet (7) closed and
reducer (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 plate and
shown on the gauge (2) - is achieved.
The compressor will now operate automatically. The pressure switch 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.
4.4.
Stop the compressor by turning the main switch off (fig.4). 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.
4.5.
The output pressure is regulated by the pressure reducer (fig.4.3). Lift and turn the knob clockwise to increase pressure and
anticlockwise to reduce it - push knob down to lock in required position. 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 gauge (fig.4.2) indicates the pressure inside the main tank, NOT the pressure supplied to the air equipment. Should the pressure
in the main tank exceed the pre-set switch (6) maximum, a safety valve (5) will activate.
WARNING!
For this reason DO NOT tamper
with, or adjust, the switch or safety valve.
fig. 4
