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Before starting, turn the power off at. Separate the. Mount the Junction Box Adapter to the. Insert and tighten.

How to Wire a Honeywell Thermostat with 4 Wires

Plate Kit. Do not overtighten. See Figure 2. Make sure the Adapter Plate is level. Attach the UWP by hanging it on the top. Snap the Cover Plate onto the Junction.

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Thermostat Honeywell T4 User Manual 16 pages. Precision electronic electric heating thermostat 6 pages. Pro th series non-programmable digital thermostat 36 pages. Before starting, turn the power off at the breaker box or switch. Open package to find the UWP. See Figure 5.

Position the UWP on wall. Level and mark hole positions.Easy to install and intuitive to use, the T4 Pro Programmable Thermostat learns how long it takes your system to reach the desired temperature and activates the system earlier to help you feel comfortable sooner. This product is sold exclusively through our Professional Partners. Use the Find A Pro link below to locate one in your area.

Part of the Honeywell Home T Series of thermostats from Resideo, the T4 Pro Programmable Thermostat helps you manage your home heating and cooling in a simple, easy to use device. Designed to streamline everything from installation to user experience, the T4 features push button control and seven-day scheduling, including an option to set a different schedule on weekends. With its adaptive intelligent recovery, the T4 helps you feel comfortable sooner by learning how long it takes your system to reach a desired temperature and activating the system earlier.

Professional installations gets professional results. Find an authorized professional near you to complete your installation. Simple Control with Smart Learning Easy to install and intuitive to use, the T4 Pro Programmable Thermostat learns how long it takes your system to reach the desired temperature and activates the system earlier to help you feel comfortable sooner. Requires a pro for pricing Toggle This product is sold exclusively through our Professional Partners.

Looking for help with a T4 Pro Programmable Thermostat? Go to support.

How to Wire a Honeywell Thermostat

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honeywell t4 thermostat wiring diagram

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How to Install Thermostat - Show Me Construction

Traing and Development. Training and Development Portal. Case Studies. Competitive Cross-Reference. Control Valves Resources. Estimating Tools. Price Books. Sales and Marketing. Savings Estimators.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. 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.

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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.See the diagram below for what each wire controls on your system:.

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.

Honeywell Thermostat 4 Wire Wiring Diagram

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.

honeywell t4 thermostat wiring diagram

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. 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.

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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. You will typically have one or two out of those three.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.

T4 Pro Programmable Thermostat, 2 Heat/1 Cool

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.

honeywell t4 thermostat wiring diagram

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. Click here to cancel reply. Estimated Time: Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area. Important: Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.