Low Pressure Sensor / Switch: Description and Operation

A/C HIGH PRESSURE SWITCH

Fig.6 High Pressure Cutout Switch Location:

The high pressure cut out switch is located on the rear of the compressor. It turns OFF the compressor if the system pressure exceeds 3240 kpa (470 psi)

A/C LOW PRESSURE SWITCH

Fig.7 Expansion Valve And Low Pressure Cut-off Switch:

The Low Pressure Cut Off Switch monitors the refrigerant gas pressure on the suction side of the system. The low pressure cut off switch is located on the expansion valve. The low pressure cut off switch turns OFF voltage to the compressor clutch coil when refrigerant gas pressure drops to levels that could damage the compressor. The low pressure cut