Pressure Cutoff Switch - Dual Function

The pressure cutoff switch dual function is used to interrupt A/C compressor operation in the event of high system discharge pressures.

- The pressure cutoff switch - dual function is mounted on a Schrader valve-type fitting on the high pressure side of the A/C manifold and tube.
- It is not necessary to discharge the refrigerant system to remove the pressure cutoff switch - dual function.
- A valve depressor, located inside the threaded end of the pressure cutoff switch - dual function, presses on the Schrader valve stem.
- This allows the pressure cutoff switch - dual function to monitor the compressor discharge pressure.
- When the 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.

The pressure cutoff switch - dual function has a second set of electrical contacts used for high-speed cooling fan control.

- When the compressor discharge pressure rises, the contacts close and engage the high speed fan control. When the pressure drops, the contacts open and the high speed fan control is disengaged.