Air Conditioning High Pressure Switch

Typical Air Conditioning Pressure Sensor:

The A/C pressure cut-off switch is used to interrupt the A/C compressor operation in the event of high system discharge pressures.

^ The A/C pressure cut-off switch is mounted on a Schrader valve-type fitting on the high pressure side of the A/C manifold and tube.
^ A valve depressor, located inside the threaded end of the A/C pressure cut-off switch, presses on the Schrader valve stem.
^ This allows the A/C pressure cut-off switch to monitor the compressor discharge pressure.
^ When the compressor discharge pressure rises to approximately 3103 kPa (450 psi), the switch contacts open, disengaging the A/C compressor.
^ When the pressure drops to approximately 1793 kPa (260 psi), the contacts close to allow operation of the A/C compressor.
^ It is not necessary to discharge the refrigerant system to remove the A/C pressure cut-off switch.