What are all the controll wires going to a carrier infinity condensor?

what are all the controll wires going to a carrier infinity condensor? straight cool not a heat pump. there are 6 wires A B C D then 2 additional controll wires running to an outdoor air sensor for the inside UI controller. what the hell are A B C D? i dont understand multiple wires to a straight residential A/C|||That is a two speed compressor and two speed condensor fan.





So you have to have at least a high, low, and common. That covers three of them. The fourth I don't know. Could be another sensor. Or may be the fan can be cycled up separately depending on the ambient temp or coil temp sensed by that air sensor.





For wiring it up I would guess it just has to be matched to the other end.





On the panel to the condensor unit there should be a schematic that may label the inputs and/or a tech sheet should be in there somewhere.





Or a tech sheet for the control unit. (The thermostat may be the control unit or there might be a separate board).





Good Luck.