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How to wire an air conditioner for control 5 wires the diagram below includes the typical control wiring for a conventional central air conditioning systemit includes a thermostat a condenser and an air handler with a heat source the heat source for a basic ac system can include heat strips for electric heat or even a hot water coil inside the air handler that is fed from a water heater. 2 how to get the electrical wiring for air conditioning systems usually the electrical wiring diagram of any hvac equipment can be acquired from the manufacturer of this equipment who provides the electrical wiring diagram in the users manual see fig1 or sometimes on the equipment itself see fig2. Wiring a digital thermostat is fairly simply as long as the order of the wires match the furnace installation central air conditioning information how to wire a digital thermostat . Central air conditioners on central units the thermostat on the wall sends 24 volts 24 volts comes from a transformer in the blower housing to relays and contactors that switch the power on and off to the compressor and motors the relay and contactors are like any other electric device it needs both wires to work