Impressive wiring diagram of honeywell thermostat - A few programmable thermostats (e.G. Honeywell prestige wiring requirements) need a minimum of five wires, and maybe more relying on what functions you need to perform (humidifier, etc). The extra fifth wire will be for not unusual; offering stepped down power from a transformer.
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Word: a previous installer can also have used a exceptional set of color wires. This will be a non trouble to preserve song of if an entire new set of thermostat wires is pulled. Otherwise tag the wires earlier than casting off from the prevailing thermostat, or take note of the terminals each twine is attached to.
Going into your furnace may sound intimidating, but when you have the basic know-how of wiring, and realize how to do away with the right furnace panels to access the electronics, then you definitely have to be excellent. The com 24v terminal can be related to the c (24 vac commonplace) of the thermostat.
A: in case you plan to upgrade to a brand new thermostat make certain you have got the proper quantity of wires available, in any other case your new thermostat received’t paintings (most advanced honeywell thermostats require a commonplace (c) cord to energy on). In case you do need additional wires, you'll need to take into account how hard installing new wires might be for your application, and if you want to price range for an electrician or hvac tech to install the proper wiring.
When you have clean get admission to to the existing thermostat wires, simply take away and observe the equal direction with the brand new set of wires. You can use cable ties, electric tape, or staples (securing wires and cables article). Be sure to take a completely conservative dimension on how lengthy your new set of wires must be. You don’t want to start over, if you arise brief.