A/C Pressure Switches

A/C high and low pressure switches may be used in the A/C compressor clutch or compressor clutch relay circuit. Switches are normally closed, completing the circuit which energizes the compressor clutch. When system freon pressure increases beyond a certain point, high side switch will open, causing compressor clutch to disengage.

If system freon level decreases, causing freon pressure to drop below normal, low side pressure switch will open, causing compressor clutch to disengage, preventing compressor damage.