High Pressure Sensor / Switch: Description and Operation

HIGH PRESSURE CUTOFF SWITCH

The high pressure cutoff switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
- The high pressure cutoff switch is mounted on a Schrader valve-type fitting on the high pressure side of the compressor manifold and tube assembly.
- A valve depressor, located inside the threaded end of the high pressure cutoff switch, presses on the Schrader valve stem.
- This allows the high pressure cutoff switch to monitor the A/C compressor discharge pressure.
- When the A/C compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C compressor.
- It is not necessary to discharge the refrigerant system to remove the high pressure cutoff switch.