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Question:

Car 4-wire air conditioning pressure switch principle, 4 lines were then received there, and the role.

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Answer:

For example, when the pressure is higher than 3.4 or less than 0.196, the compressor is disconnected Pressure higher than 1.7 when the pressure switch action, so that the condenser cooling fan high-speed operation. There are two lines are high and low voltage switch line, then the root is the medium voltage switch line, Above two are FireWire, High and low switches can be used directly with the line, the same pressure switch
Low-voltage switch control air conditioning pump work or not, and high-voltage switch is to control the high-speed fan. Please refer to the 2 valve and 5 valve air conditioning system circuit diagram. Four-wire pressure switch works are the same, About two high and low pressure switch, the upper and lower pressure switch;
No. 1 -2 normal is through the high and low off on the 3rd - 4 pass control fan high-speed relay Four of the pressure switch After opening the air conditioning switch, there are two electric (4 feet and 2 feet) that are normal. 4 feet and 3 feet for the high voltage switch, 2 feet and 1 feet for the low voltage switch.

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