22 OPERATING PRINCIPLE
• When the motor has reached steady operating speed: in this phase the air passes through the intake valve (2) and arrives at the
compressor (3).
• In this phase the compressor operates at full speed, compressing the air inside the separator tank (4).
• The compressed air does not come out of the minimum valve (6) until a pressure of 3÷4 bar has been reached (minimum valve
calibration pressure).
• The compressed air compresses the oil inside the separator tank and forces it to flow through the pipes towards the thermostatic
valve (9) and towards the oil radiator (10).
• If the oil temperature is lower than 71°C, the oil coming from the pipe flows directly to the compressor through the thermostatic
valve (9) passing through the filter (11).
• If the oil temperature is higher than 71°C the thermostatic valve (9) closes the pipe duct, making the oil arrive at the compressor
through the radiator (10), passing through the filter (11).
• The oil arrives at the compressor and mixes with the air taken in, creating an air/oil mixture which guarantees the seal and
lubrication of the moving parts of the compressor.
• The air/oil mixture into the separator tank (4) undergoes a centrifugal and then a final separation of the oil by means of the
separator filter.
• Then only water comes out of the tank, arrives at the final air cooler (7), passes through the condensate separator (8) and then
goes to the network.
• The light oil residue deposited at the bottom of the separator filter is sent back into the compressor through the oil recovery pipe.
• When the maximum working pressure set on the electronic board is reached the compressor works without load until the system
pressure reaches the reset value. If this no-load operating time is long, due to low or ceased consumption, the compressor stops in
stand-by mode.
In machines with a dryer:
• The condensate recovered in the condensate separator (8) is discharged automatically by the electrovalve (17) commanded by the
board.
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