Wire A Thermostat The diagram shows how the wiring works. However your connections may seem a little different on the thermostat itself. Just take a look at the picture below the diagram. The RED wire or 24 Vac power lead is connected straight to the RC & 4 terminals. Thermostat Wiring Diagrams [Wire Installation] Simple Guide Thermostat Wiring Diagrams. With the top thermostat wiring diagram showing an air conditioning system. The second wiring diagram showing a heat pump system. Finally, the third thermostat diagram showing the average type of split system with an Nest Wiring Diagram Nest Pod Wiring Diagram – Technology makes a better life and it’s true. Sophisticated gadgets and gadgets also come to boost your home using technology, one of which can be Nest thermostat. Thermostat Wiring Explained - Electrical Online In this article, I am going to explain the function and wiring of the most common home climate control thermostats. This information is designed to help you understand the function of the thermostat to assist you when installing a new one, or replacing or up-grading an old one. How Wire a Honeywell Room Thermostat Honeywell Thermostat Room thermostat installation & wiring guide: this article series explains the basics of wiring connections at the thermostat for heating, heat pump, or air conditioning systems. Our page top sketch, courtesy of Honeywell Controls, illustrates the wiring diagram for a traditional Honeywell T87F thermostat used for 2-wire single pole single throw control of heating only in a typical gas-fired Programmable Thermostat Wiring Diagrams | HVAC Control Programmable Thermostat Wiring Diagrams | HVAC Control - The Basics. These are the basic wiring diagrams for installing a programmable thermostat. There are some other combinations for wiring a thermostat but the information here will cover 90% of the combinations most people need.