A/C Pressure Switch -F129-, Switch Functions

A/C Pressure Switch -F129-, Switch Functions







The high/low pressure switch (located between terminals -1- and -2-) disengages A/C clutch -N25- (via A/C control head -E87-) when there are excessively high or low refrigerant system pressures.

Switching pressures (in bar)
Switch open (A/C clutch -N25- off):
- Low pressure: switch opens at 1.2 bar and closes at 2.4 bar
- High pressure: switch opens at 32 bar and closes at 24 bar

Switch closed (compressor on):
- 1.2 (2.4) bar to 32 (24) bar

The high pressure switch (between terminals -3- and -4-) switches coolant fan(s) -V7- to speed 2.

Switching pressures (in bar):
- Fan speed 2 on (switch closes) at 16 bar
- Fan speed 2 off (switch opens) at 12.5 bar