What is the general position of the air switch pressure switch?
Automotive air conditioning pressure switch is basically divided into: high voltage protection switch and low voltage protection switch two.
Its main function is to control the operation of the electromagnetic clutch in the pipeline when the pressure of the refrigerant is higher than the pressure of the system or below the basic operating pressure of the system so as to achieve the purpose of protecting the air conditioning system.
Automotive air conditioning and refrigeration systems, are generally equipped with pressure switch. Commonly used pressure protection switch with high pressure switch, low pressure switch, high and low voltage combination switch and three pressure switch, its installation location and function are also different.
1. High pressure switch
To prevent the system pressure is too high (blocking and temperature caused by too high), control the electromagnetic clutch on and off the condenser fan speed.
2. Low pressure switch
To prevent the system pressure is too low (refrigerant leakage serious, evaporator frost), control the electromagnetic clutch on and off the solenoid valve.
3. High and low voltage combination switch
High and low voltage combination switch will be high pressure switch and low pressure switch installed in a shell, installed in the high-pressure circuit, high and low voltage combination switch has two sets of contacts, but only a set of posts, can feel the high pressure side of the refrigeration system And low pressure, the implementation of the control of the compressor.
4. Three pressure switches
Three pressure switch is generally installed in the liquid storage dryer, feel the pressure of the refrigerant high pressure circuit, the pressure switch value as shown in the table (R134a refrigerant as an example).
High and low voltage combination switch will be high pressure switch and low pressure switch installed in a shell, installed in the high-pressure circuit, high and low voltage combination switch has two sets of contacts, but only a set of posts, can feel the high pressure side of the refrigeration system And low pressure, the implementation of the control of the compressor. Three pressure switch is generally installed in the liquid storage dryer, feel the pressure signal of the refrigerant high pressure circuit.
