220 Volt Refrigeration Thermostat Wiring Diagram - Wiring Diagram - A few programmable thermostats (e.G. Honeywell status wiring requirements) need a minimum of 5 wires, and perhaps extra depending on what features you need to function (humidifier, and many others). The extra fifth twine may be for common; supplying stepped down power from a transformer. Going into your furnace might also sound intimidating, but if you have the primary know-how of wiring, and know the way to get rid of the proper furnace panels to get admission to the electronics, then you have to be nice. The com 24v terminal could be related to the c (24 vac not unusual) of the thermostat.
In a scenario wherein the unique thermostat wires may additionally had been stapled to an interior wall stud, and now not run via conduit, you may be higher off leaving the prevailing set of wires, and slicing them off on the entry and go out factors of the wall. Then feed new wires with a fish tape (klein equipment). Test your local home development stores, or local device apartment, for apartment availability. A: in case you plan to improve to a brand new thermostat ensure you have the right wide variety of wires to be had, in any other case your new thermostat gained’t paintings (most advanced honeywell thermostats require a not unusual (c) wire to strength on). If you do want extra wires, you may want to recollect how tough putting in new wires could be for your application, and if you need to finances for an electrician or hvac tech to install the right wiring.
Notice: a preceding installer may have used a one of a kind set of coloration wires. This may be a non trouble to keep track of if an entire new set of thermostat wires is pulled. In any other case tag the wires before disposing of from the existing thermostat, or pay attention to the terminals every cord is hooked up to. If you have clean access to the prevailing thermostat wires, just dispose of and observe the identical course with the new set of wires. You can use cable ties, electric tape, or staples (securing wires and cables article). Make sure to take a totally conservative size on how long your new set of wires should be. You don’t need to begin over, if you come up short.