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Is an a/c trinary switch the same thing as the a/c pressure switch?
2001 toyota sequoia with rear a/c option.
Looking for the switch on the a/c line from condensor that controls the compressor cycling. Thank you!
Yes. There are 2 styles of pressure switch, binary and trinary.
The binary switch simply splices between the compressor clutch and evaporator thermostat and taps into the high pressure line. When pressures exceed safe limits, the switch opens the circuit to the compressor clutch thus disengaging the compressor until pressure return to normal.
The trinary switch operates much the same as the binary in that it shuts down the compressor when pressures rise. However, the trinary also controls an electric fan on the radiator that pulls additional air across the condenser to bring pressures down.
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