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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. Whether you are rewiring an old air conditioner for your rv or installing a brand new unit there are a few things to consider an rv is not electrically the same as a house when wiring an air conditioner keep this in mind in an rv always wire the common and ground circuits separate and provide an isolated common . The high voltage wires from the air conditioner disconnect box usually mounted on an outside wall within arms reach of the air conditioner unit are now pushed up through the wire clamp in the bottom of the box the high voltage wires have two insulated power wires and one bare copper ground wire. A thermostat wire that runs between the air conditioner unit and the furnace can become damaged quite easily since it usually is exposed along the refrigeration lines that run between the evaporator coil above the furnace and the air conditioner unit if this wire becomes damaged you will need to . Quick video stepping you through how to wire a typical 220v ac condenser unit how to wire an air conditioner condenser outside unit high low voltage ac wiring how to install a diy