Refrigerant Pressure Sensor / Switch: Specifications
LOW PRESSURE CUT-OFF SWITCHLow pressure cut-off switch contacts are open when the suction line pressure drops to about 25 psi.
Switch contacts will close when the suction line pressure rises to about 43 psi.
HIGH PRESSURE CUT-OFF SWITCH
High pressure cut-off switch contacts are open when the discharge line pressure rises above about 3100 to 3375 kPa (450 to 490 psi).
Switch contacts will close when the discharge line pressure drops to about 1860 to 2275 kPa (270 to 330 psi).
When checking refrigerant system pressures with a manifold gauge set, keep in mind that the indicated pressures will be about 172 kPa (25 psi) below the actual switch pressure values due to the pressure drop that occurs in the refrigerant system between the switch and the high pressure service port.
The high pressure cut-off switch is mounted on discharge line near compressor.