Honeywell 4 & 5 Wire Thermostat Wiring Instructions diyhousehelp August 16, 2012 Plumbing, Electrical, & HVAC 2 Comments If in the market for a new Honeywell thermostat, make sure you understand your Honeywell thermostat wiring needs before upgrading. Q: I installed my new programmable thermostat, but it won’t turn on. A: If you plan to upgrade to a new thermostat make sure you have the proper number of wires available, otherwise your new thermostat won’t work. If you do need additional wires, you will want to consider how difficult installing new wires will be for your application. Modern electronic thermostats are no different from any other technology, in that they can do more, but can also seem complicated to install and understand. One comfort to know is the basic wiring hasn’t changed much, with exception of an additional wire to get some programmable digital thermostats operating. Note: For specific thermostat model installation manuals and wiring instructions, refer to our Thermostat Buying Guide for a complete list and link of manufacturers. Individual thermostat model information is most likely the best place to find particular manuals, and not a general manuals category that can be found within the search function. 4 Wire Honeywell Thermostat Wiring G – Fan (green wire) R – 24 VAC / Rc and R or Rh (red wire) Y – Compressor / air conditioner (yellow wire) W – Heat (white wire) Note: A previous installer may have used a different set of color wires. This will be a non issue to keep track of if a whole new set of thermostat wires is pulled. Otherwise tag the wires before removing from the existing thermostat, or take note of the terminals each wire is attached to. 5 Wire Honeywell Thermostat Wiring Some programmable thermostats (e.g. Honeywell Prestige wiring requirements) need a minimum of 5 wires, and maybe more depending on what features you want to operate (humidifier, etc). The additional 5th wire will be for common (neutral), which acts the same as it does on an electrical light switch to complete a path and provide power for the display, closing switching relays, etc. G – Fan (green wire) R – 24 VAC / R and Rc (red wire) C – 24 VAC Common (color can vary per manufacturer – may be blue, purple, brown. etc.) Y – Compressor / air conditioner (yellow wire) W – Heat (white wire) Furnace Electrical Board Connections Going into your furnace may sound intimidating, but if you have the basic knowledge of wiring, and know how to remove the proper furnace panels to access the electronics, then you should be fine. The COM 24V terminal will be connected to the C (24 VAC common) of the thermostat. How to Install Thermostat Wire If you have easy access to the existing thermostat wires, just remove and follow the same path with the new set of wires. You can use cable ties, electrical tape, or staples (article) to secure the wire. Be sure to take a very conservative measurement on how long your new set of wires should be. You don’t want to start over, if you come up short. Any home improvement store should carry thermostat wiring. Also check local electrical and lighting supply houses. If wires pass through a floor and up into a wall cavity before reaching a thermostat. Try the following. Start at the thermostat location. (i) A simple trick for pulling new wires to replace existing ones: tape one end of the new wires to the end of the existing wires coming through the electrical box or wall opening. Make sure to tape completely over the wire ends, so no edges are present that can snag something. (image below) Slowly pull the new set of the wires down through the wall from the basement. (i) Use any object larger than the hole in the wall, and tie or fasten to the end of your new wires, so you don’t pull all the wire through the wall. e.g. pencil or flat washer, to act as a stop. Use electrical tape to secure if necessary. In a situation where the original thermostat wires may have been stapled to an interior wall stud, and not run through conduit, you may be better off leaving the existing set of wires, and cutting them off at the entry and exit points of the wall. Then feed new wires with a fish tape (Klein Tools). Check your local home improvement stores, or local tool rental, for rental availability. Always turn power off before performing any work. Contact a certified HVAC tech if you don’t feel 100% sure of your DIY capabilities. 2 Responses diyhousehelp January 28, 2014 Hi Bobby, Thanks for the comment. There is no timetable on replacing your thermostat. I recall contacting an electrical receptacle company about lifespan, and received the same type of answer. Just replace when need be and/or the current part doesn’t work any longer. If your current thermostat is old enough that it contains mercury, please contact your local waste disposer for proper disposal. If you are in the market for a new thermostat, please view our Thermostat Buying Guide. Reply Bobby E Jordan January 28, 2014 How often should the thermostat be replaced? Reply Leave a Reply Cancel Reply Your email address will not be published. Name* Email* Website Comment Notify me of follow-up comments by email. Notify me of new posts by email.