Refrigerant Pressure Sensor / Switch: Description and Operation

Air Conditioning (A/C) Pressure Switch

A/C Pressure Switch:

The A/C pressure switch is used for additional A/C system pressure control. The A/C pressure switch is also referred to as the refrigerant containment switch.

For refrigerant containment control, the normally closed high pressure contacts open at a predetermined A/C head pressure. This turns off the A/C by opening the A/C demand circuit, preventing the A/C pressure from rising to a level that would open the A/C high pressure relief valve.