Installing and wiring a Binary Switch

The Binary switch is purely a safety switch to protect the compressor.
The AC controls/wiring harness will have either an A/C Thermostat or A/C Relay that sends 12 volt signal to energize the compressor clutch to engage the compressor. The safety switch simply will not allow the compressor to come on or turn the compressor off if the High Side pressure is either too low or too high.

You will run a wire from the A/C adjustable thermostat or relay to one of the two terminals. From the second terminal on the switch, you will run a wire to the compressor clutch wire.

It doesn't matter which terminal goes where - the switch either is open or closed.