Carrier Heat Pump Thermostat Wiring – How To Guide?

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As a homeowner, you may want to wire a Carrier heat pump thermostat but wonder how to go about it. Fortunately, we have done some research for you, and here is what we found.

The following are step-by-step guides for wiring a Carrier heat pump thermostat:

  1. Determine how the wires work 
  2. Disconnect wires from the old thermostat 
  3. Wire the new thermostat

Wiring a Carrier heat pump thermostat is an easy task; all you have to do is to follow the steps carefully. Keep reading to get detailed information on how to wire a heat pump thermostat.

How To Wire Carrier Heat Pump Thermostat 

Hand turning a home thermostat knob to set temperature on energy saving mode. fahrenheit units. Composite image between a photography and a 3D background. - Carrier Heat Pump Thermostat Wiring - How To Guide

When wiring a Carrier heat pump thermostat, it is very important to understand the wire colors and what they stand for. This is why thermostat manufacturers label most of the terminals where the wires will go through. For example, a green wire will be connected to a green terminal.

This is why it is crucial to follow these steps in order to get it done:

Step 1: Know How The Wires Work

To have a clear view of the wires in a heat pump thermostat, you will have to detach the thermostat to see the colored wires underneath. Before installation can be done, you need a basic understanding of the wires and their functions.

The colors of the wires you expect to see are:

  • white (linked to the heater),
  • orange (connected to the heat pump and control the reversing valve),
  • green (connected to the fan),
  • and yellow (connected to the compressor).

You will also see:

  • Red ('C') which is connected to the cooling switch,
  • Red ('H') which is linked to the heating switch,
  • as well as Blue (common wire).

Now that you have a basic understanding of what each wire stands for, you can proceed to the next step. 

Step 2: Disconnect Wires From Old Thermostat 

When you want to disconnect wires from the old thermostat, start from the C-wire that powers the thermostat. However, not all thermostats have a C-wire and this does not stop their operation. If you can't locate the C-wire, it is recommended that you put a call through to a professional.

Step 3: Wire The New Thermostat 

If your C-wire is ready, you can then wire the new thermostat. Meanwhile, you can also take a picture or make a video of the connections so that you can refer to them during installation. After wiring the thermostat, you can now power it up.

Click here to see this heat pump thermostat on Amazon.

How Much Does It Cost To Wire Carrier Heat Pump Thermostat? 

Modern digital programmable Thermostat - 3d render

The average cost of wiring a Carrier heat pump thermostat is around $100-$400. Even some homeowners spend more than that when wiring a thermostat that has advanced features. 

The main work of a thermostat is to control the heating and cooling system, and all thermostats can do that, but some are better. The type of thermostat used will determine the wiring cost. 

What Happens If You Wire A Heat Pump Thermostat Wrong?

Consequences of wiring a heat pump thermostat wrongly include:

  • Electric shock 
  • High cost of electricity 
  • Unfavorable temperature

The height of it all is that the thermostat may not even work at all. To correct this, an advanced system may be required, which can lead to more repair costs.

Wiring a heat pump thermostat can be more challenging for a non-professional. Some experts advised that wiring a heat pump thermostat should not be considered a DIY project. 

Does My Heat Pump Use An 'O' Or 'B' Wire? 

The technician checking the heating system in the boiler room with tablet in hand

Heat pumps make use of O-wire and the B-wire. The main function of the O-wire is to move the reversing valve from heating your home to cooling it. While the reverse is the case with the B-wire, as it moves the same valve from cooling your home to heating it. 

However, not all units offer the O-wires and B-wires, but their operation is not affected. And if you want to know whether your heat pump is "O" or "B," you can do that by checking the configuration. Although, it is normal to get the wires mixed up and as a result of that, the unit may not heat or cool when set to either "O" or "B." 

Do I Need A Jumper Between 'R' And 'RC'?

Yes, you need a jumper between "R" and "RC" in order to power both the heating and cooling systems, respectively. So, when you notice that your system is not cooling, you can have your jumper checked because the thermostat gets power from "R" and "RC" terminals. 

In a case there is no jumper wire in the "RC" and there is in the "R" terminal, you can use the jumper plug to connect the two terminals. The same thing goes for a situation where there is wire in the "RC," and there is no wire in the "R" terminal; then you are required to move the jumper wire from "RC" to "R" and use a jumper plug to connect them.

Can I Use The 'R' Wire As 'C'?

No. If you can't find a C-wire, that does not mean you can't have a working thermostat. But instead of using the R-wire, there are other options which are as follows:

Convert The G-wire To C-wire

G-wire is a better alternative to C-wire even though it has its disadvantage, too.  The G-wire is mainly used to power the fan, but when used instead of C-wire, it will affect the fan's use. All you have to do is to remove the G-wire from its terminal and insert it in the C-terminal. 

Check for An Unnoticeable C-wire

Alternatively, you can look for a concealed C-wire. The previous thermostats weren't in need of a C-wire since they were powered by batteries. So, the common wire that isn't used remains somewhere in the wall. Check if that is what you should focus on.

Disconnect the power to your system before removing the front plate of the thermostat. You should do this to get to the old wire connections. Using a screwdriver, detach the backplate from the thermostat. When removing it, make sure to pull the wires out as well. Check for the wiring that is connected to the thermostat.

It is usually like a sheath that has various colors of wires protruding. If you succeed in locating a wire that covers the sheath, then you have found the C-wire.

Use An Adapter

This is another alternative. Some thermostats usually have home kits, but others don't. If you can't find any after getting your thermostat, you can get one yourself. Included in the kit is a diode whose work is to separate the power from the old wire ,so two wires have their own.

This may seem like an easy-to-do task, but it is recommended to call a professional to do this job. This is to avoid connecting the wires wrongly.

How Do I Test My Heat Pump Thermostat?

Control panel of the gas boiler for hot water and heating

If your thermostat is not working as expected, this is a sign that it may be faulty. To test your thermostat, here are some things you can do:

Check For Dust Build Up

The first thing to do is to check for dust or debris, as this can affect the efficiency of the thermostat. If you notice that there is a build-up of dust, you can use a vacuum to blow it off or a dry cloth to wipe it. But while doing this, make sure you don't get the vacuum close to the unit so as not to damage it. 

Check The Battery

It might be that the battery is installed wrong or faulty. If the battery installation is wrong, you can reinstall the battery. But in a case whereby the battery is faulty, then you need to find a replacement. 

To Wrap Up

hand adjusting air conditioner button at 70 degree Fahrenheit in the apartment for comfortable

Wiring a heat pump thermostat requires a basic understanding of the wires and how they work. To wire a Carrier heat pump thermostat, all you have to do is determine how the wires work, disconnect them from the old thermostat and then wire the new thermostat. Don't hesitate to call a professional if you cannot do the task alone.

If you enjoyed reading this post, here are similar articles you may like:

How To Wire Mysa Thermostat

What Is The G-wire On A Thermostat?

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