Wiring for a new honeywell thermostat wiring diagram

Typical 4 wire thermostat t-stat wiring examples follow. Some have the common C wire, while others do not. Both examples of how to wire a Honeywell thermostat with 4 wires are discussed below.

Honeywell thermostat Th3110d1008 Wiring Diagram

Of course though, you should check that the wires in your HVAC system match up with their expected functions. The red wire R, RC, RH connects the high side of the output of the control transformer to the t-stat.

Also referred to as the C wire, this wire connects the low side of the output of the low voltage power to the t-stat. Note that in our case, we had to use the green wire for C, as discussed below, because there were only four wires coming from the furnace to the t-stat which included no blue, brown, or black wire. So we decided that we could do without the fan switching function that the G wire normally provides, in favor of the remotely programmable capabilities of a Wi-Fi smart t-stat that must have a C wire in order to function.

Later on though, we hope to run new t-stat wire, that has more conductors, so we can get the C as well as the G wires. This wire controls the cooling first stage. The t-stat connects this lead to the R wire when it calls for the cooling system to come on. This involved getting into the furnace at the other end of the wires, and moving the green wire from the G to the C spot on the wiring block.

In this case, we chose to give up control of the fan, to power our Honeywell Wi-Fi t-stat. The next t-statthe Honeywell T87N big dial model, needs no common wire. Again, no blue wire here. This t-stat also needs no C wire. For this one, the red wire would attach to the R screw, the green to the G, the yellow to the Y, and the white wire to the W terminal, for single stage operation of both heating and cooling systems.

Skip to content. Like this: Like LoadingSo there are many more wires to connect up when installing a new or replacement t-stat. Gone are the two-wire days. In those times, all you needed was one wire from the furnace transformer. Plus, you had another to feed power to a gas valve or relay to turn the heat on and off. So here, we show examples of Honeywell Thermostat Wiring Diagram 4 Wire for these higher wire count t-stats.

Here, we focus on the 4 wire t-stats. Sometimes even for the above common color uses, the exact purpose of a wire is often not clear. Instead, take a picture or write down which lug on the old t-stat that each wire goes with. For each wire, jot down its color. Plus, write the letter of the terminal on the old t-stat that it connects with. If the correct wire functions are still not clear, then trace the wires.

You need to track the wires back to the HVAC unit itself. Then, find out which parts the various colors of wires attach to. Do not attempt to wire a t-stat yourself if you feel unsure with working with electricity. Further, wrong wiring can break the t-stat or furnace. This can result in costly repairs. State-of-the-art HVAC systems these days, in addition to the original single stage heating provision.

These often have a second stage heater. Plus, they also may have one or two cooling stages. Many also use another wire to turn on the compressor change over valve. This valve switches the unit between heating and cooling mode. There also may be a light L wire with a light connected to it on the t-stat. This light shows heat pump status. Each of these newer functions must have its own wire from the t-stat to tell it when to turn on.

So, these color codes help keep all the wires straight. With them you can avoid matching a wire to the wrong t-tat terminal. The table above provides a more complete list of Honeywell thermostat wiring colors and their uses. But here is a list of the most common wire color mappings, as seen in many four wire t-stat setups. Skip to content.See the diagram below for what each wire controls on your system:.

How to Wire a Honeywell Thermostat with 4 Wires

If you have a dual-fuel system, or are unsure, it is recommended that you contact a Professional HVAC Contractor to continue. To protect your equipment, turn off the power at the breaker box or switch that controls your heating and cooling equipment. To make sure that your system is off, change the temperature on your existing thermostat so that your system starts heating or cooling.

If you don't hear or feel the system turn on within 5 minutes, the power is off. If you have a digital thermostat that has a blank display, you can skip this step. Next, remove your existing thermostat from the wall plate. Most thermostats pull directly off the wall. However, some lift from the bottom and lever off, and others have a locking tab.

The next step is to take a picture of your wiring. When taking the picture, please make sure that the terminal markings are clearly visible. If you see terminals labeled A B C, or 1 2 3 then your new thermostat may not be directly compatible, as your system requires a communicating thermostat.

If you see thick, black or red wires then you have a line voltage system. This type of wiring requires a line voltage thermostat and is not compatible with low voltage thermostats. If you see wires connected to terminals labeled G1,G2,G3, you will need a thermostat capable of controlling multiple fan speeds, none of our retail thermostats are compatible with this system type.

How to Wire a Honeywell Thermostat

What you should typically see is 18 - gauge solid core wire. The most common configuration is five wires, however you could see as few as two, and as many as ten.

Any wire that is present, but not connected to a terminal you will want to make a note of, but you will not label these wires. Using the photos that you took, remove each wire one at time and label it.

After you have removed and labeled all wires you can unscrew, remove the old thermostat wall plate and mount the new thermostat's wall plate. If we recommend placing a wire in a terminal, do not move it to another terminal if we address it later in the guide.How do I connect the wires for a heater thermostat? This electrical wiring question came from: Pamela, a Handy woman from Brockton, Massachusetts.

Additional Comments: Great! Application: Wiring a Honeywell Thermostat. Skill Level: Beginner to Intermediate.

wiring for a new honeywell thermostat wiring diagram

Estimated Time: Depends on personal level experience and ability to work with tools. NOTE: Although many home heating and air conditioning systems have a standard type thermostat cable with color coded wires, the wires should be identified to make sure of the exact purpose for each wire.

More about Thermostat Wiring. More about Replacing Honeywell Thermostat. Hi Allen, If the fan is working from the manual fan switch on the thermostat then one of the components of the heating system may be faulty. There are several events that must take place before the control board will allow the heating process to begin. Each of the components are monitored by sensors, such as the exhaust discharge fan, and limit switches. If any one of these components or sensors are not working properly, or if the main control board is faulty then the heating cycle will not be triggered to start.

This problem will require specific testing and troubleshooting of your furnace to locate the problem and then make the necessary repairs. I hope this helps, Dave. You must be logged in to post a comment. Get a Quick Reply! Ask an Electrician. February 26, at pm. Log in to Reply. Dave Rongey says:. Don says:. December 25, at pm.Free Wiring Diagram.

Thermostat Wiring Explained!

Variety of honeywell thermostat thd wiring diagram. A wiring diagram is a simplified conventional pictorial depiction of an electrical circuit. It shows the components of the circuit as simplified forms, and also the power and also signal links in between the devices.

wiring for a new honeywell thermostat wiring diagram

A wiring diagram normally gives details concerning the family member setting and also setup of devices as well as terminals on the tools, to assist in structure or servicing the device. A pictorial layout would show much more detail of the physical look, whereas a wiring diagram uses a much more symbolic symbols to highlight interconnections over physical look. A wiring diagram is often used to troubleshoot troubles and also to make certain that the connections have been made which every little thing is existing.

Assortment of honeywell thermostat thd wiring diagram. Click on the image to enlarge, and then save it to your computer by right clicking on the image.

A wiring diagram is a type of schematic which utilizes abstract photographic symbols to reveal all the affiliations of parts in a system. Electrical wiring layouts are made up of 2 things: signs that stand for the parts in the circuit, and also lines that stand for the connections between them. Electrical wiring representations primarily reveals the physical placement of elements as well as links in the built circuit, but not necessarily in logic order. It highlights on the layout of the cords.

Schematics emphasize on exactly how circuits work practically. To review a wiring diagram, initially you need to understand what basic elements are consisted of in a wiring diagram, as well as which photographic symbols are made use of to represent them. The typical elements in a wiring diagram are ground, power supply, wire and link, result gadgets, switches, resistors, logic gate, lights, and so on. A line stands for a cord. Cords are used to connect the elements with each other.

All points along the wire are similar and also connected. Wires on some locations require to go across each various other, but that does not always indicate that they connect. A black dot is made use of to suggest the injunction of 2 lines. Key lines are represented by L1, L2, and more. Generally different shades are used to differentiate the wires.

There need to be a tale on the wiring diagram to tell you what each shade indicates.

wiring for a new honeywell thermostat wiring diagram

A collection circuit is a circuit in which components are linked along a single course, so the existing flows via one element to get to the following one. In a collection circuit, voltages add up for all components attached in the circuit, and also currents are the exact same with all parts. An excellent wiring diagram requires to be technically proper as well as clear to read. Take treatment of every information. The diagram should reveal the appropriate direction of the favorable as well as negative terminals of each component.

Use the best icons. Find out the meanings of the basic circuit symbols and select the right ones to use. Some of the signs have actually close look.

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