Carrier Infinity Thermostat Wiring Diagram Exclusive ✦ Quick & High-Quality

The is simultaneously simpler and more complex than traditional diagrams. It is simpler because you only need four wires (A, B, C, D) regardless of how many stages your equipment has. It is more complex because those four wires carry digital data, not simple on/off signals.

You must use the specific 4-wire communication cable provided by Carrier or a high-quality shielded cable. Using standard thermostat wire (like 18/5) for long runs can sometimes introduce interference that disrupts the data signal between the thermostat and the furnace. Carrier Infinity Thermostat Wiring Diagram

The basic ABCD wiring stays the same, but where those wires go changes depending on your equipment. Below are the most common scenarios. The is simultaneously simpler and more complex than

If you have a full Infinity system (Infinity Furnace, Infinity Outdoor Unit, and Infinity Control), your wiring diagram is surprisingly clean. The thermostat connects to the furnace control board using a proprietary 4-wire communication bus. You must use the specific 4-wire communication cable

If you are uncomfortable verifying 24V AC with a multimeter, or if your home requires new wire runs through finished walls, contact a Carrier Factory Authorized Dealer. A single crossed wire can destroy a $500 thermostat or a $2,000 control board. However, with the correct diagram and careful attention, wiring an Infinity thermostat is a satisfying DIY project that unlocks the full potential of one of the best HVAC systems on the market.