How to Wire a Trane Command Aire

High Voltage Circuit

• 1

  Turn off the power in the circuit breaker panel. Never attempt to install electrical circuits or electrical cable into a circuit panel before turning off the power.

• 2

  Remove the front panel to the breaker box. Identify an open slot for the breaker, and snap the new 220V breaker into place. Check the Trane manual for the recommended breaker amp rating. Based on the size of the Command Aire system, the circuit requires a 20 to 40 amp breaker.

• 3

  Run the 10/3 electrical cable from the breaker box to the location of the Trane Aire Command heat pump. Attach the electrical cable to the overhead floor joists with electrical cable staples along the path across the basement. This electrical cable should not be spliced. Due to the high voltage carried by the circuit, it should be a single piece.

• 4

  Identify the electrical connections on the Trane unit. Located behind a small removable plate, every Trane heat pump has a three lug power connector. Connect the three insulated conductors to the appropriate lugs, and connect the uninsulated ground wire to the frame of the Trane unit.

• 5

  Return to the breaker panel, and connect the electrical cable into the circuit box. The two positive leads (red and white) are connected to the new breaker. The grounded lead (black) and the uninsulated ground wire are connected to the ground lug inside the breaker box. Snap the breaker into place, and put the cover back on the breaker panel, and turn on the panel's power.

Low Voltage Thermostat Circuit

• 6

  Find the existing low voltage, thin, four-conductor wire which is connected to the household thermostat. Usually gray, and about half the diameter of a pencil, the wire was installed when the original HVAC system and original furnace was installed in the home.

• 7

  Open the thermostat wiring access panel on the side of the Trane unit, and identify the thermostat connection lugs consisting of 6 small screws. The thermostat tells the heat pump when to turn on and off based on the temperature of the home.

• 8

  Connect the thermostat wires to the smaller connection lugs according to the instruction manual included with the Trane unit. Thermostat wires are connected following the color codes to the screws labeled R (red), G (green), Y (yellow) and O (orange).

• 9

  Connect a jumper wire between the screws labeled Y and W.