Instruction book
5.4 Adjustment of MDR4S pressure switch (Figs. 5.4 up to 5.6)
The adjustment of the maximum or stopping pressure of the compressor is effected by means of the air
pressure switch. The switch also controls the pressure difference between the maximum pressure
(stopping pressure) and that at which compression is resumed (starting pressure).
Caution
- Adjust the air pressure switch while it is pressurized.
- Switch off the voltage before removing the cover of the switch; reinstall it after an adjustment has
been made and before the voltage is switched on again.
Adjustment
The maximum pressure is controlled by adjusting screw (4). Turn the screw clockwise to raise the
maximum or stopping pressure, anti-clockwise to lower it.
The pressure difference is adjusted by means of screw (5). To reduce the difference between the
stopping and starting pressures, i.e. increase the starting pressure, turn the screw anti-clockwise. To
increase the pressure difference, turn the screw clockwise. The adjustment range is shown on the
diagrams (Fig. 5.6).
Fig. 5.4 View of air pressure switch MDR4S Fig. 5.5 Adjusting screws, MDR4
1 Air pressure switch
2 Solenoid valve
3 Pressure release valve
4 Adjusting screw, stopping pressure
5 Adjusting screw, pressure difference
Figs. 5.4 and 5.5 Air pressure switch
2920 1585 00 - 57 -
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