Refrigerant Pressure Sensor / Switch: Description and Operation

PRESSURE SWITCH
The pressure switch is a high-pressure side component of the refrigeration cycle (cooling cycle). It consists of a diaphragm that receives refrigerant gas pressure, a snap plate, a rod, and contacts that open both when the gas pressure is too low and when it is too high.

The pressure switch plays the following roles:
- Prevents "no-gas" operation due to leakage (when gas pressure is too low)
- Protects the cooling system against abnormally high refrigerant pressure (when gas pressure is too high)





ON-OFF pressures