How to hook up thermostat C wire?


I would appreciate a sanity check/advice from this community.

I plan to install a Wifi thermostat (likely a Honeywell) that requires a C wire in a house built in 2005. It's propane forced air plus AC. There is a blue wire running from the furnace to the (old, dumb) thermostat, but it's not connected to anything on either end.

On the furnace end, there is clearly a C terminal on the circuit board, with one wire attached to it, going to the AC compressor. The transformer hooked to the circuit board is labeled 24VAC 40VA.

From everything I've read online, I think I can simply:

Shut off power to the furnace and AC at the breaker box. Hook up the blue wire to C terminal on the furnace so both the blue wire and the white AC wire are attached. Hook up the blue wire to new thermostat as part of installing it. Turn breakers back on and enjoy the vast wonders of 21st century networking...
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Disconnect the power to the thermostat at the main circuit breaker.

Remove the faceplate of the old thermostat. The face plate is usually not screwed into the base plate or thermostat and will snap or twist off.

Disconnect the wires from the thermostat by turning the screws on the connectors. Do not allow the wires to fall back into the wall. You may need to pull them further out of the wall and can tape them to the wall to hold them in place.

Remove the screws holding the old thermostat and base plate to the wall. Remove the old thermostat and base plate.

Hold the new thermostat base plate in place on the wall and mark the screw holes with a pencil. Set the base plate aside.

Drill holes for the wall anchors that came with the new thermostat, and lightly tap the anchors into the holes with a hammer.

Position the new base plate on the wall, pulling the wires through the hole on the base plate. Secure the plate to the wall with...

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Moving the thermostat to a new location is not recommended unless you hire an HVAC professional to relocate the thermostat first. Thermostats need to be located in a strategic area of the home to be effective and work properly. Besides you would have to pull new thermostat wire through the wall to relocate the thermostat and that is a big job for anyone.

Tools Needed – How to Hook Up a Home Thermostat

You will need a small flat head screwdriver, possibly a Phillips head screwdriver, a pair of electrical stripping and cutting pliers for #18 thermostat wire, a pen and paper, and some small labels to label the existing wires hooked to the existing thermostat. A small drop cloth or paper can also be used to place on the floor below the thermostat to catch dust, debris, and other stuff that can fall on the floor.

Step by Step – How to Hook Up a Home Thermostat

Turn off the power to the air conditioner or furnace preferably at the electrical panel where the...
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Car 2017 - 5 Wire Thermostat Hook Up, How to wire a thermostat | wiring installation instructions, How to wire a thermostat - your thermostat or programmable thermostat is an integral part of your comfort system. these thermostats, whichever type of. How to hook up two baseboard heaters to one thermostat, 1. locate a spot on a wall opposite the baseboard heaters to mount the thermostat. measure and mark a spot 5 feet up from the floor. use an electronic stud finder to .. Thermostat wiring colors code | hvac control wire details, What you will learn in thermostat wiring colors code. article: what thermostat wire color is likely to go to which terminal on the thermostat. basic electrical safety ..

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Electrical wire, welding cable, romex, hook up wire, Buy electrical wire, flexible welding cable, hook up wire and power cables here with per...

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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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SOURCE: Air Conditioner malfunction

Hi, Sounds like you have a short in the control circuit to me. Turn off all power going to the unit. Write down or otherwise mark the wires leaving the control board going to the thermostat. Remove them from the control board. Replace the fuse. Turn power back on and see if the fan still runs. If it does, check and or replace the heat limit switch that brings the fan on during the heat cycle. It may just need adjusted. If the fuse blows, I would think that the control board is probably bad. If it doesn't blow, Remove the thermostat. Leaving all thermostat wires open check them with an Ohm meter. There should be no continuity between them. Twist all the wires together at one end and ohm them again at the other end. You should have complete continuity on all wires. If the wiring checks out, down power the unit. Double check your wire colors and rewire the control board. With all wires open at the thermostat, turn the power back on. Touch...

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THERMOSTAT WIRE CONNECTIONS - CONTENTS: Guide to Thermostats for Heating and Air Conditioning Systems. Wall mounting, leveling, and wiring requirements vary depending on the type of room thermostat and what it needs to control. How to select the proper type of replacement thermostat for air condtiioning or heating systems. POST a QUESTION or READ FAQs about heating, air conditioning, and heat pump thermostat installation and wiring REFERENCES

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Room thermostat installation & wiring guide: this article series explains the basics of wiring connections at the thermostat for heating, heat pump, or air conditioning systems.

We provide Honeywell, White Rodgers & other thermostat wiring diagrams and explanation showing how to wire a room thermostat, including just what connections to make and how wires and connectors are color coded to...

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If you have installed a circulating pump in your hot water system, you may have also decided that the efficient method to keep it running properly is to also install a thermostat and control. Like any thermostat, the circulating pump thermostat is used to regulate the temperature of the hot water and turn on and off the pump as necessary to ensure that hot water is appropriately flowing through your home without expending unnecessary energy.

Step 1: Prepare to Install Thermostat

Turn off water to the circulating pump. Drain any excess water out of the system and close isolation valves that are on both sides of the circulator. Make sure that you have appropriate wiring available to hook up the thermostat. You may wish to also turn off the breaker for safety.

Step 2: Terminal Box Position

Before you install the thermostat the pump motor shaft must be horizontal. Make sure that the terminal box is on the side of the motor housing. Ensure that...

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Hold On, I say Hold On.....

I read your post three x, I "think" I know what you want, but......This outside boiler, how does the control circuit work? Is it looking for a contact closure (i.e. thermostat) or is it looking for a 24 volt control voltage to pull in a control relay? As far as that picture you posted, that appears to be a "fan center". It has it's own trans/relay, thermostat gets tied into that, then fan center controls 120 volt load. (I.e. pump, blower, etc).

Tell me if this scenerio is correct: Your t-stat calls for heat, you want blower in basement to come on, then circulate water from OWB?

Let me know, I'll walk you through it. I gunno have "a few" more beeers now, we'll get this figured...

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Last updated on September 9th, 2017

Back in the olden days, thermostats were simple on/off devices that didn’t need their own continuous power supply. Modern thermostats with Wi-Fi and backlit display, by contrast, need a steady supply of juice.

The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat.

Technically speaking, power flows from the R (red) wire, but not continuously (not on its own, anyway). To make it continuous requires a common wire to complete the circuit. When the circuit is complete, 24V energy will flow continuously.

If you’re considering purchasing a smart thermostat, you’re probably thinking of doing the installation yourself. After all, if you’re able to change a light switch or receptacle, you’re skilled enough to install a smart thermostat – assuming your system already has a C wire.

If your system has a C-wire, it might be in use or just tucked away behind your current...

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Last updated on September 2nd, 2016

The C-Wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. It’s a wire that (if you have one) runs all the way from your furnace to your thermostat.

Questions about the C-wire are by far the biggest drivers of traffic to this site, so I’ve written this article to help you understand what the C-wire is, help you find your system’s C-wire, and help you decide what thermostat to buy based on what wires you have and/or are willing to install.

This bundle green, blue, yellow, white, and red color wires is known as “5 conductor” wire and it is a common type of thermostat wiring.

To find out if your system has a C-wire

The simplest way is to pop your thermostat off the wall and look at the wires behind it and where they are hooked up. Remember, the colors don’t really mean anything. Think of the colors as a suggestion: the C-wire is usually the blue wire, but that’s not a...

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Baseboard heater strips come from the manufacturer with built-in thermostats. They do the job that they were designed to do, but they have drawbacks. First, quite often using them means getting down on the floor and crawling under or behind tables to adjust them. Second, if you have two or more baseboard heaters in the same room, you have to adjust each of them individually. It is much more convenient and efficient to connect the baseboard heaters in parallel and hook them up to one wall-mounted, across-the-line thermostat.

Locate a spot on a wall opposite the baseboard heaters to mount the thermostat. Measure and mark a spot 5 feet up from the floor. Use an electronic stud finder to make sure that you will not be drilling or cutting into a wall stud.

Mark the location using the “old work” box as a template. Draw an outline around it. Drill a 1/4-inch hole in the inside corners of the outline and then use the portable jigsaw to finish removing the cutout.


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Thermostat wire is made of multiple strands of solid copper wire, each wrapped individually with a colored shell and enclosed together inside a protective sheathing. During installation, the wires are connected to one board that sends certain data through each wire to the thermostat. The system will not operate correctly if the wires are incorrectly connected.

The thermostat wire is color coded so the technician can identity which wire goes to which port on each board. It’s important to note that in some cases the color of the wire does not necessarily mean it connects to that came color one the board. This could happen if the wires are swapped on both ends or if there’s a spice in the wire somewhere that was not matched up to the correct color.

If you decide to get rid of your outdated thermostat for a smart or wifi thermostat, be sure to mark the wires to indicate which color letter on the board they are connected to. Only after you’ve done this, disconnect the...

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