Let's take a look at the G wire. Step 9. Mount the thermostat base by gently pushing the excess wire back into the wall opening and plugging the hole with a fire-resistant material. Because many thermostats come with a pre-installed thermostat jumper wire that connects these terminals, you only need one red wire, which could be the thermostat Rc wire or the Rh wire. Connect the remaining supply wire, which is typically white, to the second thermostat wire (typically marked L2 or Line). The same two wires that connect the thermistor to its excitation source can be used to measure the voltage across the thermistor. Safe and precise temperature transmission and control can prevent unplanned production downtime Heck, now I’m not calling anyone a dummy! Tighten the screws securely. View this page in another language or region, Learn more about the  https://www.thermostatcenter.com/ is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Prevent unplanned production downtime, Measuring Temperatures in Furnaces with Oxidizing Atmospheres, @media screen and (max-width:1024px){ 4-Wire Thermostat Wiring So you’ve decided to install your new thermostat and discover that you have an unused wire but you do need a C wire connection. Red – Now, there can be two separate wires for this. Step 8. Fiberglass insulation is great for preventing drafts from affecting thermostat operation. AND it has been recorded by a professional in the industry. The Orange Wire. Install the replacement wall plate and hook the new thermostat up to the old wires. It is very simple and pretty straight forward. One of the biggest complaints, or rather, reasons for confusion I have come across is down to the fact that many thermostats on the market don’t work if your system isn’t equipped with a ‘C’ (common) wire. When you purchase an item through links on our site, we may earn an affiliate commission. Do not let them fall back in through the hole in … For more advice from our General Contractor reviewer, including tips on how to replace the thermostat in your car, keep reading! One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. Reviews and General Information on Programmable Thermostats. A C wire adapter (common wire adapter) is basically a small electronic device, which re-purposes the existing wiring between your thermostat and the furnace, to add a new wire to the system. Screw the system wiring to the screw terminals on the new thermostat using the letter labels as reference (strip the wires back if necessary). Thermistors are very simple to wire. Connect each marked wire to the corresponding terminals on the thermostat with a screwdriver. The main trouble is dealing with those different colored wires, knowing which one does what and if that wasn’t enough, you also have numbers and letters to deal with. Most come with two-wire connectors. You now know how to look for a c wire or common wire in your heating system wiring. But you do have a gas, oil or propane conventional forced-air system and a wire labeled G. If you use this option, the G wire will be substituted for your c wire at both your thermostat and HVAC system. Running New Thermostat Wire – It is possible that you may have to run a new thermostat wire from the air handler or furnace to the location where the existing thermostat is located. Heck, now I’m not calling anyone a dummy! Wire to provide necessary power to the location where your thermostat wrapping wire! A fishtape to feed the wire cutters to strip each wire so that there approximately. 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