Thermostat Wiring Problem - DoItYourself.com Community Forums - In a state of affairs in which the authentic thermostat wires may have been stapled to an interior wall stud, and now not run thru conduit, you will be higher off leaving the prevailing set of wires, and reducing them off at the entry and go out factors of the wall. Then feed new wires with a fish tape (klein equipment). Check your local home development shops, or nearby tool rental, for rental availability. A: in case you plan to upgrade to a new thermostat make certain you have got the right number of wires to be had, in any other case your new thermostat gained’t paintings (most advanced honeywell thermostats require a not unusual (c) twine to electricity on). In case you do want extra wires, you will need to recall how hard installing new wires may be to your software, and if you want to price range for an electrician or hvac tech to put in the proper wiring.
When you have clean get right of entry to to the present thermostat wires, simply eliminate and follow the same route with the new set of wires. You could use cable ties, electric tape, or staples (securing wires and cables article). Make certain to take a completely conservative measurement on how lengthy your new set of wires should be. You don’t want to begin over, if you arise short. Going into your furnace might also sound intimidating, but when you have the simple understanding of wiring, and know a way to take away the right furnace panels to get admission to the electronics, then you definitely ought to be excellent. The com 24v terminal might be linked to the c (24 vac common) of the thermostat.
A few programmable thermostats (e.G. Honeywell status wiring necessities) need a minimum of five wires, and perhaps extra relying on what functions you want to perform (humidifier, and so forth). The additional 5th twine might be for common; imparting stepped down energy from a transformer. Observe: a previous installer may additionally have used a extraordinary set of color wires. This can be a non problem to keep song of if an entire new set of thermostat wires is pulled. Otherwise tag the wires before casting off from the prevailing thermostat, or be aware of the terminals each wire is attached to.