MAINTENANCE
22
M4 M5,5 M7,5 M11
SETTING THE PRESSURE SWITCH (1PS)
TO CHECK THE MAXIMUM DISCHARGE PRESSURE
(Pressure switch upper trip point)
Slowly close the isolation valve located adjacent to the compressor.
Observe the rise in pressure and ensure that the pressure switch
opens (and unloads the compressor) at the correct Maximum
discharge pressure.
The maximum discharge pressure is shown on the machine data plate.
DO NOT exceed these figures.
TO CHECK THE LOWER SET POINT
Observe the line pressure fall and note the point at which the
pressure switch closes (and loads the compressor).
The lower set point is factory set 0.85 bar (12psig) below the upper
set point to suit the average application.
TO ADJUST THE UPPER SET POINT
Remove the transparent cover and turn the adjuster [1]. The red
pointer will move. Turn the adjuster anti–clockwise to increase the set
point or clockwise to decrease it.
TO ADJUST THE LOWER SET POINT
Remove the transparent cover and turn the adjuster [2]. The green
pointer will move. Turn the adjuster anti–clockwise to increase the set
point or clockwise to decrease it.
NOTE
The pressure switch scale is a guide only. Use the machine
pressure gauge to verify the upper and lower set points.
To Next Page
Loading...
