What is ob on a thermostat

This thermostat is the master in a 3 zone system - no heat pump, forced air and oil heating but we still have o and b wires. Now I am stumped as the master has the following wires in the photo :. B wire is Blue and O wire is Brown.

Note: This post was originally published on June 27, If you have both an Rh and an Rc wire, the former powers the heating and the latter powers the cooling using two separate transformers. If, for example, you have an R wire and an Rc wire, the R wire controls the heating system. G: This wire controls the blower fan, which is responsible for pushing the warm or cool air through all the vents in your house. It is not a ground wire! Y, Y1, Y2: Whenever your thermostat calls for cooling, the Y wire is used to send a signal to your HVAC system telling it to fire up the air conditioner. Y1 and Y2 wires might be used instead if you have a two-stage system i.

What is ob on a thermostat

Home Knowledge Base. Thermostats act as the command center for heating and cooling systems, and their wires are like the hidden messengers. Generally, a wire is connected to each control point within the HVAC system. These wires are typically color-coded to simplify the setup. The C-Wire , or common wire, is essential for smart thermostats, like the Nest thermostat. Without it, maintaining Wi-Fi connections and providing consistent functionality would be a challenge. A traditional thermostat might not need a C-Wire but adding a smart thermostat without one may require some additional wiring. Specifically, it determines whether the heat pump is in heating O or cooling B mode. Understanding the installation and compatibility of an OB wire on a thermostat is crucial for both safety and performance. This section will guide you through the necessary preparation, the steps for installation, and how to address compatibility and troubleshooting concerns. Before starting the installation process, identifying the thermostat model and existing wiring is essential. Turn off the electricity to the HVAC system to prevent any electrical shock. By following these safety guidelines, installation steps, and compatibility checks, you should achieve a successful setup and avoid common pitfalls. Modern thermostats are equipped with features that enhance temperature management and energy use in homes.

Anyone know if Red and White would at least start the furnace? Newer smart thermostats probably have a configuration setting for that. I will need to do some research.

Log in. Sign up. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Nest and Ecobee both told me it wouldn't work.

Nest heat pump orientation is a setting on a nest thermostat that is used to set cooling and heating of a heat pump system between O and B. This makes it possible for the heat pump system to heat your home during the heating season and cool it in the cooling season. When energized, the reversing valve helps the heat pump to switch between the cooling and the heating modes. A reversing valve is a small device on a heat pump system that moves between two positions depending on the OB settings on your thermostat. It switches the direction of the flow of the refrigerant so that in one direction, the outdoor coil will act as the condenser coil with the indoor coil acting as the evaporator coil. This helps the heat pump to work as an air conditioner. It will change the direction of the flow of the refrigerant into the opposite direction. In this position the outdoor coil will act as the evaporator and the indoor as the condenser and this will make it possible for the heat pump to heat a home or building. Setting an appropriate heat pump orientation is important because it will determine what air will blow out of vents.

What is ob on a thermostat

Timothy Thiele has an associate degree in electronics and is an IBEW Local Union Electrician with over 30 years of experience in residential, commercial, and industrial wiring. Emily Estep is a plant biologist and journalist who has worked for a variety of online news and media outlets, writing about and editing topics including environmental science and houseplants. The thermostat that is used to control the heating and cooling HVAC system in your home is a low-voltage device that is easy enough to replace. And replacing one is a very common project, as homeowners swap out older thermostats requiring manual adjustment with newer programmable thermostats that change temperatures automatically at preset times.

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The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating. Take a picture of the wiring configuration for reference. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo. Chromecast Help Center. Admittedly, I didn't read the whole thing. If, for example, you have an R wire and an Rc wire, the R wire controls the heating system. Related Stories. Now here is the problem, since the zone controller is not very intelligent, the system will only turn on when Nest on TSTAT-1 is calling for Heat or Cooling. Jerilyn Brown - Apr 26, Reply. There's no orange wire in the thermostat cable, so connect white to "O" at the thermostat. Next Continue. I would do that. The smart residential smart controllers I prefer are the ecojay SmartZone 4X.

Note: This post was originally published on June 27, If you have both an Rh and an Rc wire, the former powers the heating and the latter powers the cooling using two separate transformers.

Yes - planning to buy two Ecojay Smartzone 2x panels, and adding photos of the attic above and basement below, with the jumper. Search instead for. Recommended Communities. Sign up. In response to hram. Mine also has one marked H. Connect to the the terminals based on their labels. A secondary heat source located in the air handler will kick on. Thanks delack. Start a new one or visit our Help Center. All heat pumps have a reversing valve to switch from Heating to Cooling or from Cooling to Heating. I think the red jumper completes the circuit but want to be sure before I connect a jumper from 24v to Rh in the ecojay and short something.