[geunther]

Originally used to set the idle at all times. Then de-energized after turning off ignition and like manual says, plates closed beyond idle. Agree with others that was to prevent dieseling upon shutdown.

Wasn't meant from factory to be related to ac.

Certainly could have been modified to increase idle when ac operational if power was supplied in connection to the ac. Mine is still in place and works. However, I have it disconnected and adjust the idle with traditional method.