Can anyone tell me what each of the following inputs and outputs into the ECU do? They are pinouts on the ECU for the airconditioning system.

Air Conditioner Pressure Transducer
Air Conditioner Refrigerent Discharge Temp
A/C Evapor air temp
A/C Relay (WAC)
Air Conditioner Demand
Air Conditioner Recirculation Override


I dont have the standard ECU anymore and want to know if the aftermarket ECU is doing the job as it should be.

Cheers,
Dan