2. Dual Switch

2. DUAL SWITCH
The dual switch is located on the high pressure line above the receiver dryer. When an abnormal pressure occurs in the high pressure line, the dual switch is forced to OFF to stop operation of the compressor.
- When the pressure is abnormally low [177 kPa (1.8 kg/cm2, 26 psi) or less]
The dual switch is forced to OFF to prevent operation of the compressor when there is no gas caused by leakage of the refrigerant.
- When the pressure is abnormally high [2,648 kPa (27 kg/cm2, 384 psi) or more] The dual switch is forced to OFF to protect the air-conditioning cycle parts.





During normal operation (Contact point is ON)
When the refrigerant pressure is applied from inside the housing to the seal film, a force is exerted from the stopper, guide head, high pressure disc and high pressure internal lid to the low pressure disc to set the low pressure guide pin free, causing the moving contact to be ON.





During abnormal low-pressure operation [P
If the refrigerant pressure falls, the pressure on the seal film is lost, and the force exerted from the stopper, guide head, high pressure disc and high pressure internal lid to the low pressure disc decreases, and the low pressure disc rotates back, pressing the guide pin down and causing the moving contact to be OFF.

During abnormal high-pressure operation [P > approx. 2,648 kPa (27 kg/cm2, 384 psi)]
If the refrigerant pressure becomes abnormally high, a force is exerted from the seal film to the guide head and press guide, and the high pressure disc rotates back, pressing the guide pin down and causing the moving contact to be OFF.