Main application:

1, the pressure switch installed in air conditioning system in the high voltage circuit, to cut off the circuit when the system pressure below the set value. Protection is not under the condition of lack of refrigerant compressor idling, was destroyed in order to avoid the lack of lubricating oil. Under the condition of low temperature to avoid air conditioning start, increase evaporator freezing unnecessary power consumption.

2, medium voltage state cooling fan reduce the condenser temperature and pressure.

3, when the abnormal high pressure system automatically cut off the compressor clutch and protection system are not destroyed.

Using defect:

　　The defects of the structure design for: as the metal plasticity and memory recovery characteristics of diaphragm, the poor stability and fatigue resistance; Instantaneous impact current is very big, frequent communication when power is easy produce arc and burn out alarm contacts. Led to a mechanical pressure switch more than mechanical failure (such as silver point contact wear and ablation, alarm contacts wear and vibration resistance is poor), low degree of standardization, limited life and other factors.