Refrigerant Pressure Sensor / Switch: Description and Operation

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 kg/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 kg/sq.cm, 427 psi) or more]

The pressure switch turns OFF to prevent the system from being damaged.