Refrigerant Pressure Sensor / Switch: Testing and Inspection

Inspection
If problems occur in the refrigerant system that cause abnormally high pressure (above 2,942-3,334 kPa {30- 34 kgf/cm2 427-483 psi}) or abnormally low pressure (below 177-230 kPa {1 .8-2.35 kgf/cm2, 26-33 psi}), the refrigerant pressure switch will cut power to the magnetic clutch to protect the mechanical components. If the pressure recovers to within normal operating range, the power will be restored.





1. Connect a manifold gauge set to the charging valve, and verify that the high-pressure side reads 260-2150 kPa {2.6-22.0 kgf/sq. cm, 37-312 psi}.
2. Disconnect the refrigerant pressure switch connector and verify that there is continuity between the switch terminals.
3. If there is not continuity, replace the refrigerant pressure switch.