Connect with an agent for quick assistance. My Wiring. These other articles help you with thermostat wiring colors and thermostat wiring diagrams. It energizes the compressor contactor in the condenser. We have other articles here that will help you with thermostat wiring. multiple designations like W and O/B, it will be labeled as W and O/B and not just one or the C Wire Designation and Terminal - the old C wire?
If you have separate wires for O and B, you will want to tape heating and cooling. other.
If you don't hear or feel For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 There are many variations to wiring a heat pump for control because there are many types of heat pumps. Some digital thermostats use batteries for power. We'll assume you're ok with this, but you can opt-out if you wish.
compatible, as your system requires a communicating thermostat. A wire nut connects the black of the 18/8 thermostat wire to the black of the 18/2 thermostat wire within the furnace. How to Calculate Negative Equity Percentages, Florida Power & Light Company: Ask the Energy Expert, Issues That Can Affect Air Conditioning in a Home, Help for When a Central Air Conditioning Unit Quits Working.
In a heat pump, this is for heating and cooling. All day (24 hours), Monday through Sunday, Professional Contractor Support Moreover, one side is for line voltage into the transformer, and the other side is the 24-volt control voltage coming out the other side of the transformer (see illustration above right).
Method 2: Look at the wires inside your furnace.
Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Humidistats come in two types, which basically comes down to 1-wire or 2-wire controls. If you have more than one wire (you have a wire labeled R, and another We also use third-party cookies that help us analyze and understand how you use this website.
(The ease of doing it this way will vary by furnace and installation.) The reason for this is most modern thermostats require or need a C wire to function. The reason for all the consternation mentioned above is that many older thermostats did not require a C wire.
It is sometimes referred to as auxiliary heating, and it is used in case something goes wrong with the condensing unit. The solution is a humidistat, which runs the air conditioner to control the humidity level inside the house independently of temperature.
*Always follow the manufacturers wiring instructions concerning this.
Gas Heating Troubleshooting and Repair Index, Variations for Heat Pump Thermostat Wiring, Heat Pump Thermostat Wiring Designations / Terminals and Colors (Thermostat Wiring Colors are Industry Standard (typical)), Heat Pump Thermostat Wiring Schematic Diagram, Other R Wire Terminal Designations and Wires, Other Heat Pump Control Terminals and Wiring Designations, Auxiliary Thermostat Wiring for Heat Pump Thermostats, Conclusion | How to Wire a Heat Pump for Control – Heating and Cooling, heat pump needs a supplemental heat source, older mercury thermostat, make sure you dispose of it properly, two transformers powering a single thermostat, Blank Display Problem – Screen Disappeared, Honeywell Heat Pump Thermostat Troubleshooting, How Can I Tell 1 or 2 Transformers for Heating Cooling System, How to Wire an Air Conditioner for Control – 5 Wires, HVAC Products Containing Mercury and Proper Disposal, Thermostat Wiring Instructions not Matching New, What Temperature Should I Set My Programmable To, Wiring a Programmable for Geothermal Heat Pump, If the temperature falls below a certain point, the.
Furthermore, it will be cheaper, in the long run, to get a professional HVAC technician to do this for you rather than burn something up for miswiring. You will typically have one or two out of those three. requires a line voltage thermostat and is not compatible with low voltage thermostats.
It can be W-O/B, O/B, W-O, W-B, or you may Consequently, this means if you don’t have the right amount of wires at the thermostat, you would need to run new thermostat wire to the new thermostat. In this case, you will need a thermostat that has a W2 terminal and a Y2 terminal. W Wire Terminal Designation - This color is typically white and goes to the W terminal. your thermostat. have a metal staple, others may have a plug, and the jumper may also just be a wire connecting Writing professionally since 2008, Michelle Miley specializes in home and garden topics but frequently pens career, style and marketing pieces.
Sorry, something went wrong. The reason for this is most modern thermostats require or need a C wire to function. If you do not know the terminal that each wire connects to, it may be necessary to go to the HVAC system and look at the designations on the control board. However, some lift from the bottom and lever off, and others have a locking tab. In this case, the transformer is the source, the R wire, and the C wire, is the path, and the thermostat is the load. R Wire Designation and Terminal - The R wire is is the 24 volt hot originating from the 24-volt control transformer. Saturday and Sunday O Wire Terminal Designation - This color is typically orange and goes to the O terminal (in Rheem and Ruud, it goes to the B terminal). How to Unlock a Jenn-Air Oven After Self Cleaning. The next step is to take a picture of your wiring. That is if you have a modern digital thermostat that doesn’t require batteries. Open Hours:
you just have one wire, regardless if it's labeled RC, it will go into the R terminal, and the jumper
If the temperature is high but the humidity level is low, the humidistat does not allow the air conditioner to run.
- You have a single wire labeled W-O/B and we advise placing it in the O/B terminal. In that case, you will not need to worry about a C-wire or as it is sometimes labeled C1 wire. Locate any unconnected wire labeled W or W1. If you only have a single transformer, then you will likely have a jumper wire (or brass strip) between the RH and RC terminals. the W terminal.
When taking the picture, please make sure that 1-800-468-1502
This wire will also run to the air handler/furnace and the condenser. Next, let's talk about the C, or common wire.
heating, cooling, fan, etc. Disable power to your furnace and pop the cover off.
You can’t have two transformers powering a single thermostat.
Using the photos that you took, remove each wire one at time and label it. You also have the option to opt-out of these cookies. Use our helpful tool to take an assessment of the existing wiring in your home. Open Hours:
Lastly, they need the C wire to complete the circuit and have power. Most transformers in either system can handle the VA rating required to power all controls in both systems, and the re-wiring is simple (at least for me it is). Although mold and mildew do not form at humidity levels below about 68 percent, Craig Muccio of the Florida Power & Light Company recommends a setting of 58 as humidistat gauges can be off by as much as 10 percent. This website uses cookies to improve your experience. Saturday and Sunday: 9am - 5pm CDT, Indoor Air Quality and All Other Homeowner Products
When wiring, each wire should be identified by what terminal(s) it connects to, never by color.
See the diagram below for what each wire controls on your system: U – Humidifier, Dehumidifier, or Ventilator control, O/B – Reversing valve for Heat Pump systems. wire, as we've already instructed you to place it in O/B.). The control transformer in the heating system will have a red wire terminated at the RH. *There is no standard for which color wire controls each function.
Follow the basic thermostat wiring instructions for those wires. After you have removed and labeled all wires you can unscrew, remove the old thermostat wall Make sure the air conditioner is set to the “cool” and “auto fan” settings, then set the temperature on the thermostat to 75 degrees Fahrenheit. We do get a small commission from any sales for our affiliates for which we link.
Additionally, air source heat pumps have backup methods of heating for two reasons.
The thermostat is simply a switch, and the power originates from the transformer through this terminal. After mounting the new thermostat’s wall plate, we can re-connect the wiring.
When it goes into defrost mode, the backup heat is energized. To make sure that your system is off, change the temperature on
If you find a C-wire in your furnace, then the other end is probably stuffed into the wall behind your thermostat.
I had an apprentice ask me one time why is only one common wire or c wire used in this situation. If you get confused, call in a professional. Connected Smart Home Products The instruction guide should help you navigate through the settings to make the appropriate changes to the thermostat so it will function properly as a heat pump thermostat.
Saturday and Sunday: 9am - 5pm CDT, Online Order Support and Customer Service aux is what the heat pump can’t cover.
Please follow the below guide for the basic wiring walkthrough: To protect your equipment, turn off the power at the breaker box or switch that controls your Open Hours: This commission helps us pay for the overhead of running this website.
It also has a humidifier at the furnace terminal block i have Y,W,H,R,GH,C,G.
Her essays have been used on college entrance exams and she has more than 4,000 publishing credits. These cookies will be stored in your browser only with your consent. We’ll use this information to improve our help and support content in the future.
1-800-633-3991 A heat pump thermostat requires more conductors than an air conditioner thermostat. This will ensure your installation goes as easy and quickly as possible 1. Saturday and Sunday: There other possible wiring configurations for your heat pump thermostat wiring, but these are the basics.
If your old thermostat uses two separate wires and they were terminated at Aux and E separately, then use a wire and an extra wire to bundle these wires together. It would be easier to replace the sail switch with a standard 24v coil relay.
Any wire that is present, but not connected to a terminal you will want to make a note of, but you your existing thermostat so that your system starts heating or cooling.
9am to 6pm CDT In this article, we will provide specific information for wiring a heat pump for control.
If in the previous step you identified an O, B, or O/B wire that’s connecting to the O/B terminal, and have a separate W wire, place this wire into the W2 terminal. Your email address will not be published.
This category only includes cookies that ensures basic functionalities and security features of the website. Lastly, always make sure to follow the instructions for the thermostat manufacturer for wiring and setup.