How do I wire a thermostat with an external 24V transformer?


Go to a Plumbing Supply, Home Depot, Lowes, Sears or other home center and ask in the department that has preferably some experienced help. It would help to have as much information about the old thermostat as possible as there should be one that is a line voltage model as they are still made. They are not that expensive and it would be a lot more trouble to rewire for a new low voltage system. Since the condo already has a setup for the line voltage model, check around and get a licensed Electricians advice as that is more in his line of work and an Electrical Supply house carries a lot of different Thermostats too! Replacement "in kind" is cheaper, believe me.

Source(s): Retired Electrician - NJ

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In this article, I am going to explain the function and wiring of the most common home climate control thermostats. This information is designed to help you understand the function of the thermostat to assist you when installing a new one, or replacing or up-grading an old one. We will focus mainly on the basics of home heating / cooling thermostats, and first of all, I will explain the function of them.

The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system. By the use of an adjustable set-point, the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home, and to turn off the system when the desired temperature is achieved.

The most basic of systems (such as an older ‘heat only’ forced air / gas furnace with a standing pilot light) only need two wires for control. They connect to a two-wire thermostat (generally a...

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When I install any new thermostat, I always take a look at one thing first: the c wire. Why? This thermostat wire is used by Wi-Fi models, like the ever popular Nest. But not every thermostat has a c-wire, which can become a major issue.

What is a C-Wire, and Do I Have One?

In short, this wire provides power to a thermostat. Since older models were often dials, they didn’t have a need for immense power consumption. Models now have LED screens, a variety of settings and features that make controlling a home’s heating and cooling a breeze. In technical terms, the c-wire is the 5th wire and supplies a 24vac power source.

Smart thermostats require this wire to run properly.

When removing an old thermostat, the easiest way to find if the c wire is present is to look at the number of connecting wires available. If you count 5 wires, you’re good-to-go. Typically, the c wire will be the blue wire that is connected to the thermostat, but colors may...

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thermostat conversion from 120v to 24v for nest...

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Posted on Oct 02, 2017 by Can Sabana in Wiring

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Wiring A 24v Thermostat

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If you're posting a request for installation help, please provide as much info about your system as possible. For example, for help regarding connecting a smart thermostat, please include details about your system including whether you have gas/electric, heat pump, number of heat stages, A/C condenser, etc.

I am trying to connect an Ecobee3 to my forced water gas boiler. The boiler only has 2 wires and I've been told by a plumber that it is not possible to run a C-wire from it, so I am considering running the thermostat off an external transformer. Can anyone provide details on how to do this? Any cons to using an external transformer instead of a C-wire?

I found some generic instructions on powering a thermostat off an external transformer on YouTube:

Would these instructions be correct for the...

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I just purchased a new Nest thermostat. My old thermostat gets power from an ancient millivolt system (thermopile on top of pilot light generates 0.7VDC). This is incompatible with the Nest, since the Nest requires standard 24VAC. Nest support told me they've heard some customers have had success using 24v step-down transformer. After lots of research, I think the wiring is supposed to go something like this: W from furnace (common, -0.7VDC ?) --> W on T-Stat 24 VAC power from transformer (+/- ?) --> C on T-Stat R from furnace (+0.7VDC ?) --> RH on T-Stat 24VAC power from transformer (+/- ?) --> RH on T-Stat As you can see, I'm still a bit fuzzy on the details. Questions are below the fold!

• Which of the 24v wires (+/-) coming out of the transformer go to which terminal on the Nest (C, Rh)?
• Is it really okay that the 0.7VDC furnace/millivolt Rh wire and one of the 24VAC transformer wires will be on the same Rh connector on the Nest? If I understand...

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First off, Alarm Grid always recommends using a licensed HVAC installer to help you install a Honeywell ZWSTAT Thermostat.

Now if you're a seasoned DIY and have wired thermostats in the past and are ready to tackle the ZWSTAT, you should first consult the Honeywell ZWStat Installation Manual.

Pages 4-5 have very detailed wiring instructions for 11 different common configurations including 4 conventional and 7 with heat pumps.

If you're not sure which wiring system you have? You're probably in over your head and should consult an HVAC installer!

Still going? Okay, if you check your air handler it should be pretty easy to determine if you have a conventional or heat pump.

Number of transformers? Do you have a high-end, newer efficient unit? Then you'll likely have two transformers if your'e unit has a high and low setting.

Next up, if you're unit was properly wired before, it will be as simple as matching color-to-color once you identify...

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