Reference Designation
Da Automatic drain connection
Dm Manual drain connection
Da1 Automatic drain connection of the dryer (only on Full-Feature units)
Dm1 Manual drain connection of the dryer (only on Full-Feature units)
2.6 Regulating system
Load/unload regulating system
Regulating system (loaded condition)
Loading
When the net pressure is below the loading pressure, solenoid valve (Y1) is energised. Results:
• The space above unloading valve/blow-off valve (UV) is connected with the oil separator tank pressure
(1) via the solenoid valve.
• Unloading valve/blow-off valve (UV) moves downwards, closing off the connection to channels (2) and
(3).
• Underpressure from the compressor element causes loading plunger (LP) to move downwards and inlet
valve (IV) to open fully.
Air delivery is 100%, the compressor runs loaded.
Unloading
If the air consumption is less than the air output of the compressor, the net pressure increases. When the net
pressure reaches the unloading pressure, solenoid valve (Y1) is de-energised. Results:
• The pressure above unloading valve/blow-off valve (UV) is released to atmosphere and the space above
valve (UV) is no longer in connection with the oil separator tank pressure (1).
Instruction book
22 2920 7109 60
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