Thermostat Wiring Colors Code Easy HVAC Wire Color Details 1 Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code; Tstat Terminal Designation: Color of Wire and Termination: R – The R terminal is the power. It is a red wire and comes from the transformer usually located in the air handler for split systems, but you may find the transformer in the condensing unit. How to Install and Set Up the Nest Thermostat Nov 01, 2016From there, you’ll be able to see the wiring of your thermostat. We recommend taking a voltage tester and confirming that there isn’t power running to it. If there is, you need to go back to the breaker box and try turning off another breaker. You’ll get a diagram showing you the wires that the Nest Thermostat has detected. If all How to Install a Thermostat - The Home Depot Safety Tip: Make sure you don't install a new thermostat on circuits exceeding manufacturer-specified voltage. Higher voltage thermostat wiring will damage the controls and may cause shock or become a fire hazard. Additionally, short or incorrect thermostat wiring will damage the unit and may cause personal injury and/or property damage.[PDF] TACO ZONE CONTROLS WIRING GUIDE - HVAC Specialty Thermostat and Zone Valve Wiring 52 – 56 Radiant Mixing Block 57 – 58 X-Pump Block 59 – 61 iSeries Mixing Valves 62 – 63 When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failure to follow these wiring instructions may result in a secondary source of Understand Basic HVAC Electrical Components & Wiring in Connecting all of the electrical components together is the electric wiring. To keep track of wiring, HVAC technicians rely on circuit schematics or visual representations of wiring programs. There are three basic types of circuit schematics used in HVAC today. They are the Line Diagram, the Ladder Diagram, and the Installation Diagram.