This wire takes care of emergency heat functions. They connect to a two-wire thermostat (generally a mechanical thermostat with a mercury filled ball connected to a coiled bi-metal strip).A basic two-wire thermostat can be compared to a simple single-pole switch that you will find throughout your home, only instead of you turning the switch on and off as required, a mechanical or electronic temperature controlled mechanism is the operator of the switch.The terminals are usually marked ‘R’ and ‘W’. They use more power than old thermostats and need to have their own power supply.Thermostat C-Wire is that extra cable providing extra power to the smart thermostat. If the fan fails to run for any reason, the heat exchanger will get too hot and the hi-limit temperature device will open the circuit to the gas valve, closing the valve and stopping the heat cycle.If your home’s system of this vintage has provisions for air-conditioning (cooling), then the thermostat wiring will have at least three wires (some will require a separate ‘R’ terminal for heating and cooling and will be labeled ‘Rh’ and ‘Rc’ now needing a minimum of 4 wires), ‘R’, ‘W’, and a ‘Y’ terminal.When the mode is selected for cooling (basic heat / cool thermostats have a mode selector for either ‘heat’, ‘cool’, or ‘auto’) when the room temperature rises above the set-point, the thermostat will close the connection between the ‘R’ and the ‘Y’ terminals completing the circuit to the compressor and condenser unit that provides the cooling for the evaporator coils mounted in the discharge ducting of the system.The next step up from the older home systems was the introduction of the ‘fan on / auto’ switch. One of these wire nuts can be used for each of the conductors that you’re going to be using.Fire block sealant and electrical tape is also a good idea to keep on hand if you’re going to be adding a C-Wire yourself. In this article, I am going to explain the function and wiring of the most common home climate control thermostats. While it’s always good to give someone a chance, it might not be the best idea to let an inexperienced individual install a new wire in your home.Ask about their licenses and make sure they give you an itemized estimate. Then reassign one of the remaining wires as a C-Wire.Each furnace panel is different from ones used by other manufacturers. There are also several kits available that can make the task easier. Users convince themselves that they won’t be taking much power and configure it to consume only a light amount of power. Heck, now I’m not calling anyone a dummy! As long as you’re working with a reputable contractor who you’re sure can configure a C-Wire for you.You may have a background in the field of residential wiring or have enough knowledge to work with wiring safely. While others decide to instead have a professional do so. If you have any questions or comments on your furnace situation, feel free to add a comment below.Have you been stumped by a three-way switch, struggled installing a new receptacle, or basically put off doing any wiring project yourself because you didn’t feel confident working around electricity? Thanks for taking the time to read it!
So here, we show examples of Honeywell Thermostat Wiring Diagram 4 Wire for these higher wire count t-stats. But as mentioned, today’s t-stats, with their ever growing feature list, have more wires to ring out. Thermostat Wiring for Dummies. I completely understand. Then you go through the step-by-step setup process and your thermostat is ready to use.Some of the smart thermostats can be installed without a dedicated C-Wire. It means that it works with a majority of systems out of the box even if they don’t have a C-Wire.Each Emerson Sensi thermostat comes with a pair of regular AA batteries. Even the most seasoned people who enjoy DIY may come across problems with wiring a thermostat. Copyright © www.electrical-online.com | The line voltage feeding the furnace (to operate the fan blower motor) is transformed down to a safer level of 24 volts (the gas control valve needs 24 volts to open), and after making a series loop through at least one safety device (the most basic and mandatory one is an over-temperature shut down), the power goes up to the thermostat, and when the room temperature falls below the set-point, the contacts close completing the circuit to the gas valve allowing it to open, the main burner to ignite, and begin the heating cycle.In this the most basic of heating systems, as the temperature of the heat exchanger rises, another contact is closed on the line voltage side of the equation, and the fan blower motor starts moving air through the heat exchanger and out through the ducting in the home. This terminal is for a common connection from the control transformer that will provide steady 24 volt power between terminal ‘R’ and ‘C’ to power the thermostat itself.If adding wires to your thermostat location is not possible, or very difficult, look for a thermostat that is battery powered which won’t require the terminal ‘C’ for operation. Sticking label to each wire works best.C-Wire is an power cable that provides current to smart thermostat devices.If you have C-Wire install it simplifies the smart thermostat installation process. The obvious down side of this is that if the battery goes dead the thermostat will no longer function.Climate control systems have evolved a great deal in the last several years with the evolution of electronic control.