Did you know that your thermostat is an important part of your comfort? So each thermostat that you have used in your home or even not used yet, require proper maintenance. Most of you only know about your furnace or air conditioner.
Actually, the thermostat is the control gadget that offers a user-friendly interface to control your home climate. A wifi thermostat in your home set the heating and cooling system and turns off the unit when the temperature of the room is desirable.
I also used different models in my home and tired to install the system by myself. But I would suggest you that if you are not experienced in the installation of your thermostat by yourself, take help from qualified HVAC expert.
In this article, I am going to help you to learn about your system beyond the thermostat. I hope this thermostat wiring guide will help you to learn your system properly.
Colors and functions of wires
When you are going to wiring a thermostat, you must have knowledge that what kind of system you have in the home and which is the best one. There is no denying that most of the people are using an HVAC system, which has an Ac unit and furnace.
Well, when you are going to wire your system, if you don’t know how to wire the HVAC system, I would suggest you take help from HVAC professional to complete this task. Let me share that thermostat circuits have the two scenarios.
When you are installing the thermostat, you should keep in mind that these wires have some colors and letters. So you need to be cautious while installing the system. Therefore, I am going to explain the colors and function of wires for your convenience.
Yellow wire: you need to contact this wire to the compressor.
White wire: this wire will be used to connect to the heat on HVAC system.
Orange wire: you need to connect to the heat pump.
Green wire: the wire of green colors will connect to the fan.
Blue wire: bears in mind that blue wire is c wire.
Red wire: if you find two red wires, you don’t need to be worried. Simply one red wire is for cooling and other for heat.
Black wire: black wire will use to connect different outdoor heating system.
Thermostat wiring colors code guide
Learn the wires colors code correctly: Thermostat installation is not difficult for those who are much familiar with the color codes of wire as colors code have a significant role in the installation of the thermostat. So it is necessary to connect the proper wire to the right terminals.
I should want to draw your attention toward this serious issue that doesn’t take it lightly as if you fail to connect the right wires it could become the reason of any hazard such as short circuits. So I would recommend you to take your time to learn the all wires color codes properly or take help from the HVAC professionals.
Be familiar with the system: As you know, that thermostat comes with cooling and heating anticipators so be careful whiling adjusting the anticipators as don’t try to fix heating anticipators at the place of cooling anticipators. Both cooling and heating anticipators are significant for the cooling as well as heating system.
If you have adjusted the anticipators correctly, then your system will work efficiently. So while installing the wires, you should power up the system and try to connect the 24V power cable to the C and R terminals. Remember that R wire has a red color and C wire has a black color.
|Marking||Wire Color Code||Description|
|R||Red||Power, 24 Vac transformer|
|Rc||Red||Power from cooling, 24 Vac transformer|
|Rh||Red||Power from heat, 24 Vac transformer|
|C||Black/Blue||Common of 24 Vac transformer|
|W||White||Primary heat cell relay|
|E||Brown||Emergency heat relay|
|Y||Yellow||Primary cool call relay|
|Y2||Yellow||Secondary cool call relay|
|O||Orange||Change-over relay to cool relay|
|B||Blue||Change-over relay to heat relay|
|A||Heat and cool active to any relay|
|L||Emergency heat active lamp|
|X||System malfunction lamp|
|P||Defrost control lamp|
Types and colors of wires:
There are common four wires in your system that are Red, Green, Black, and Yellow, but there are also other colors wire such as blue, white and orange, white, green, brown, blue stripe and orange and these wires are networking cables. You will find the four primary and eight wires of different colors in a heat pump system.
The Red wire should be linked to the R terminal which comprises RH, RC, and R units but it depends on the thermostat usage. Now I would like to write about the yellow wire that you will find in AC units, and these wires need to be connected to the compressor. It is necessary to connect the yellow wires to the Y terminal and sometimes these wires need to be attached to the condenser and compressor as well.
Next is the green wire that needs to be connected to the G terminal, and I should mention here that these wires could be used to control the fan. These wires could also be worked to triggering the fan through programming your system.
You will also find the number of other colors wires which need to be connected to the different systems. Be cautious that these colors wires are not same in each system; you should check your system properly and read the manual guide about the colors wires.
If there is a white wire in your system, you only need to connect it to the W terminal as this terminal has a direct link to the boiler. The Dark blue wires should be attached to the B terminal that you will find in the heat pump.
The most common wire you will see in electronic thermostat that is the black wire. This color wire should be attached to the C-terminal that is linked to the standard cables.
How to setup your system?
Hire an HVAC expert
You need to setup your system. You could set it by yourself, or hire professional staff. Bears in mind that if you try to install DIY install the system, and you are not experienced in this work, then you could face a serious problem with your thermostat and you will not get the desirous results.
Furthermore, if you want to setup multi-zone system, these systems could be very complicated to install, and this system may require a proper thermostat control circuit.
Cooling and heating anticipators
I would like to discuss another important point about thermostat wiring that HVAC systems are equipped with cooling and heating anticipators. But just remember that in mechanical thermostat don’t adjust the cooling anticipators at the place of heat anticipators.
If you have a non-digital thermostat, you need to set the heat anticipator correctly as it is significant for your heating system. After setting the cooling and heating anticipators, make sure the cool or heat anticipators are set accurately in your system so that you could get the perfect outcomes.
Pump system could be complex to set up
If you are replacing your old system with latest programmable systems, the HVAC systems will be compatible to work efficiently with the newest unit. Your heat pump system is different from the HVAC system and could be difficult to set up, and it may need more circuits.
Be careful while installing your system
If your system is not working efficiently or you are not getting proper cooling or heating in your home, then you only need to call the service department. Most of you don’t do be careful while installing their system. They don’t pay attention toward installation directions.
I would suggest you to read the manual guide correctly and follow all instruction for a better result. If you followed all instructions carefully but you are not getting proper outcomes, then you need to contact the service department and discuss your problem.
I should mention here that there are different varieties of the thermostat. The professional HVAC expert who have to install the unit they often used five to eight cables. Now I would like to discuss some installation tips that could help you to set up your system.
Get the all necessary tools
You need to get the all required tools before installing the thermostat. Here the most commonly tools that you need to take before starting your work. You need a screwdriver, needle nose pliers, wire strippers, a drill, a masking tape, lights, a paper and pencils.
Now you need to install the unit and turn off the electricity circuit and circuit breaker. It is very important to follow precautions, as it can become the cause of injury. You should label the all circuit breakers and emergency switches properly. While hooking up the all things you need to be careful and don’t try to touch any wrong wire.
Read all the instructions
If you are replacing your mechanical thermostat with newer thermostat, then you don’t need new settings. You have to adjust it to the same setting and if you are replacing your mechanical thermostat with digital thermostat, then no worries, the digital model has ability to set itself automatically.
When I was installing my thermostat, I was read the all instructions carefully and followed the rules. Another important point about thermostat wiring that I want to share, you should set the anticipator correctly as if anticipator is not set accurately, it can cause your heater to run inefficiently. Your thermostat has cooling anticipators that are non-adjustable.
Turn off the electrical circuit
Before installation your system and thermostat wiring, you need to shut down the electrical circuit, as your carelessness could become the cause of any hazard. If you have already installed the system in your home, you should remove the system carefully.
Firstly, remove the previous model from the wall and use the screws to eliminate the unit from the wall but be careful while removing the system as the electrical system is still there.
Keep the sub-base in right position
Now unscrew the system from the sub-base and match the major terminals and wires on the thermostat. You will find an internal jumper built into the sub base. Remove all wires from the sub-base terminals. Try to pull the all wire slightly to check that is there any wires behind the wall.
You need to match your newer sub-base with old base and after comparing put the sub base backside on the wall in your required position. When you decide the place, you need to mark the holes so that the screws could go into the holes to fix the wires.
Use wall anchor kits
There are many anchor kits are available on the market, but I would suggest you to use the wall anchor kit as it is the best among others. You should be remembered that bit must be smaller than the anchor. Wall anchor will not be able to hold the thermostat if the bit is bigger because your thermostat could also fall off the wall.
After all, you need to drill the holes and try to insert the wall anchors. Now, insert the screws and try to keep the sub base in level. Don’t become careless in this matter. If you move the sub-base while fastening the screws, you will get the required consequences. So keep it in the right position and then fasten the screws.
Tight all wires correctly
One thing you should remember that use the color code to attach the thermostat wires and tried to connect the all cables to the terminals properly. Your all wires must be tight, as the loose wire will not give you perfect performance.
Don’t leave any bare wire as it could become dangerous for you. When you succeed to attach your system to the sub base, you must check the settings of your anticipator and check the heating and cooling system properly.
Make sure that everything is working accurately or not. After your installation, your system should perform properly and if your thermostat fails to work efficiently. Contact with customer support and discuss your problem.
Before installing and thermostat wiring, you need to be aware that what type of system you require for your home. And which is the best system for the comfort of your family? Use the thermostat that should be easy to install and if you have doubt that you could not install the system, then I recommend you to take help from the HVAC professionals.Related posts: