Refrigerant Pressure Sensor / Switch: Description and Operation

Pressure Switch:

Pressure Switch
The pressure switch is located on the high-pressure line to the receiver drier. When an abnormally high or low pressure occurs in the high-pressure line, the pressure switch turns OFF to stop operation of the compressor.

When the pressure is abnormally low [177 kPa (1.8 kgf/sq.cm, 26 psi) or less] The pressure switch turns OFF assuming that the refrigerant is lost due to leakage.

When the pressure is abnormally high [2,940 kPa (30 kgf/sq.cm, 427 psi) or more] The pressure switch turns OFF to prevent the system from being damaged.