From page 10 of the instructions.
"5 - GREEN wire, A/C terminal for front mounted condenser, same as the A/C
compressor clutch wire. (does not need to be connected if not needed)"
You only use this terminal if you have a forward mounted condenser. My guess would be that it tells the RFC to turn on the fans for the A/C sytesm if they are not on for the radiator cooling system.
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