What is ob on a thermostat

Upon first installing your thermostat, if heat is coming on instead of AC, it may be due to incorrect wiring or an incorrect configuration.

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. Go to the Recommended Answer. There is no affordable zone controller that will handle three HVAC equipment.

What is ob on a thermostat

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. The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating. X, AUX: Some heat pump systems can provide auxiliary heat. This wire sends a signal to your system calling for auxiliary heat if the outside temperature is too cold for the heat pump to work alone. A secondary heat source located in the air handler will kick on. E: This works nearly identically to auxiliary heat, but for emergency purposes only. It has to be turned on manually, whereas auxiliary heat can turn on automatically if need be.

Modern thermostats are equipped with features that enhance temperature management and energy use in homes.

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. Can anyone help me? Sort by Oldest first Oldest first Newest first Most reactions.

The O setting in setup is the most common. When setting up a new thermostat, and you select O, the heat pump should cool while in the cool mode. This might sound silly, but it depends on what climate your unit was manufactured for. Let me explain. When you choose O or B controls, you are selecting what mode the reversing valve will be in heat or cool. The reversing valve is the valve that switches the heat pump between heat mode and cool mode. Manufacturers make two basic heat pump designs when referring to reversing valve controls. One is for cool climates, and the other for warmer climates. They want the heat pumps in cool climates to fail reversing valves get stuck in the heat mode and units in warmer climates to fail in the cool mode.

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.

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Repair Expand child menu Expand. Does it mention B somewhere else? Mine also has one marked H. Glad it's going. Skip to content. Let me know if you think I should take a picture of the unit. From what I'm seeing, it should have been connected to just the O portion of the terminal and I think that the blue wire should go to the O and the white to W. Connect by chat, phone or email. S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat. Do not proceed if you are unsure about any step. If I understand this correctly, you should have one or the other, not both.

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.

Note: This post was originally published on June 27, You will book up the thermostat with all wires and the R will not be separated like the EWC. S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat. Turn on suggestions. These devices allow users to set precise temperatures for different times of the day or night. Common issues with OB wire installations include the thermostat not activating the heat pump or reversing valve correctly, which can result from wiring mistakes, incorrect settings, or a faulty thermostat. If you accidentally wired up your ecobee system as a Conventional system when you have a Heat Pump system , once you have corrected the wiring you will need to reconfigure the ecobee. Do you know how I would be able to figure out if I have a second stage system or not? Feel free to reach out to me if need realtime guidance. No other thermostat can change the system mode. Her is what I see in the AC unit. JavaScript is disabled.