It serves as a signal if the compressor needs to be repaired. When the pressure inside the AC cycle are exceptional (higher or lower) than specification.Bi-pressure switch: double pressure settings in both high and middle pressures first in TAiwanese manufacturing.HP: 19.2 kg/cm on, 32.0 kg/cm off. MP: 21.1 kg/cm on, 18.1 kg/cm off.
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