Advanced wiring diagram for thermostat - A: if you plan to upgrade to a brand new thermostat make sure you've got the proper quantity of wires to be had, in any other case your new thermostat won’t work (most superior honeywell thermostats require a common (c) wire to electricity on). In case you do need extra wires, you'll want to do not forget how tough installing new wires could be for your software, and if you need to budget for an electrician or hvac tech to install the right wiring. If you have clean get right of entry to to the prevailing thermostat wires, just cast off and observe the equal course with the new set of wires. You can use cable ties, electric tape, or staples (securing wires and cables article). Make certain to take a completely conservative size on how long your new set of wires must be. You don’t want to start over, if you arise short. In a state of affairs in which the authentic thermostat wires may had been stapled to an indoors wall stud, and no longer run thru conduit, you will be higher off leaving the existing set of wires, and cutting them off at the access and go out points of the wall. Then feed new wires with a fish tape (klein tools). Check your neighborhood home development stores, or nearby device apartment, for condominium availability.
Going into your furnace may sound intimidating, but when you have the fundamental knowledge of wiring, and recognize the way to take away the right furnace panels to get entry to the electronics, you then need to be first-rate. The com 24v terminal might be connected to the c (24 vac common) of the thermostat. A few programmable thermostats (e.G. Honeywell status wiring requirements) want a minimal of 5 wires, and perhaps greater depending on what capabilities you need to operate (humidifier, and so on). The extra 5th twine could be for common; providing stepped down energy from a transformer. Be aware: a previous installer might also have used a specific set of colour wires. This will be a non trouble to preserve track of if a whole new set of thermostat wires is pulled. In any other case tag the wires earlier than disposing of from the prevailing thermostat, or take note of the terminals every cord is connected to.
For folks that choose to see an actual wiring schematic or diagram when wiring up a room thermostat, those illustrations are provided here to help recognize what wires are being connected and what every wire is doing.