Refrigerant Pressure Sensor / Switch: Testing and Inspection

Check high pressure switch.
1. Install manifold gauge set.
2. Check continuity between the two terminals of the pressure switch when refrigerant pressure is less than approx. 12.5kg/cm2 (178 psi, 1,226 kPa).
3. Check that there is no continuity between two terminals of the pressure switch when refrigerant pressure is more than approx. 15.5 kg/cm2 (220 psi, 1,520 kPa)
If continuity is not as specified, replace the switch.









1. Disconnect connector of pressure switch.
2. Inspect pressure switch.
a. Install the manifold gauge set.
b. Observe the gauge reading.
c. Check continuity between the two terminals of the pressure switch.
If defective, replace the pressure switch.
3. Connect connector of pressure switch.