Simple honeywell th9421c1004 wiring diagram - A: in case you plan to upgrade to a new thermostat ensure you've got the right quantity of wires available, otherwise your new thermostat gained’t work (maximum superior honeywell thermostats require a commonplace (c) twine to electricity on). In case you do want extra wires, you'll want to consider how tough installing new wires may be in your application, and in case you need to finances for an electrician or hvac tech to install the right wiring. Bypassing the honeywell eim (equipment interface module) to install the ecobee4. I'm now not an hvac guy... I am not a smart thermostat guy... I used to be simply pissed off that there are not any how-to videos or different visible aids that i may want to locate, so i recorded this to optimistically assist a person else having the equal problem.
I see what has passed off. The existing thermostat is set for "speaking" with the furnace and does now not use the usual 24v signal like several different thermostats. The one you presently have is designed particularly for special high furnaces. It uses 3 "data" wires to speak. Could want rewire at furnace and at thermostat to new terminals at both ends and make a non speaking thermostat. Which by using the way does decrease the efficiency. So what i have is for the high performance furnace? Is that what you supposed by using "unique high furnaces"? I am looking to update it with a clever thermostat, a nest. Am i able to use the nest as a substitute?.
Not as a speaking stat. Your stat is the high stop stat for "speaking" backward and forward with the furnace to run as effectively as viable. If we use the nest we lose that and we have to rewire the thermostat wire to in which 5 wires at both ends, the usage of lettered terminals as opposed to numbers. I've a honeywell th9421c1004 thermostat that i'm changing. Once i dispose of it from the wall, there are 3 wires that go into the base but they may be now not marked. I have important warmness, significant air, and a humidifier. How do i pick out each cord?.