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. If this is happening, please remove the ecobee thermostat from the wall and check the following.

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?

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. Go to the Recommended Answer. There is no affordable zone controller that will handle three HVAC equipment. You will need one zone controller for each of the air handlers that has dampers in the ducts. The smart residential smart controllers I prefer are the ecojay SmartZone 4X. View Recommended Answer in original post. The reason I prefer the EcoJay SmartZone is they will allow any zone thermostat to activated the system and thermostat 1 is still the priority thermostat. Additionally they are capable of Supporting the Nest Thermostat in heat pump duel fuel mode. They are easily configured and programmed. As to those O and B wire, you will not need them. With the ST-2E there can only be 1 master thermostat.

Secure the wires firmly under the terminal screws, ensuring no loose strands. You definitely need to consult the manual for your HVAC where the other end of the wires connect and look at where they attach on that board. Connect to the the terminals based on their labels.

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.

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. But people are often confused by the system by which the low voltage wires are labeled, which can look different in an old thermostat than it does in a new one. Contrary to popular belief, the letters do not correspond to wire colors but rather are used to indicate the various function signals controlled by each wire. Between the thermostat and the heating or cooling equipment is a set of low-voltage wires that are run from the thermostat control terminals to the terminal screws on the furnace or air conditioner control terminal strip. These strips of terminals have markings on them to signify the heating connection, the cooling connection, the fan connection, and heat pump connection, as applicable. There is also a terminal that supplies the power to run each of these functions. Most thermostat wires operate on volt power provided by a transformer, and they are generally safe to work on without shutting off the circuit feeding the thermostat wiring.

What is ob on a thermostat

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.

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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. Each HVAC system has its own duct system. Appreciate the help! You will need one zone controller for each of the air handlers that has dampers in the ducts. Hello CoolingWizard - got the 2x, have figured out the dampers we have 2 dampers actually on the ecojay vs EWC, and everything but am stuck on the 24v supply. All forum topics Previous Topic Next Topic. Yes - planning to buy two Ecojay Smartzone 2x panels, and adding photos of the attic above and basement below, with the jumper. In the EWC, the supply is from the air handler, but there is a jumper from the 24v supply in to the Equipment terminals you can see both the EWC photos above. Should I just leave it? Computer Repair Expand child menu Expand. DoomsDave Replies.

Understand how it impacts your HVAC system.

When engaging your air-conditioner compressor, the ecobee will energize the Y1 connector , so you'll want to make sure you have the correct wire in the Y1 connector. Cell Phone Repair Expand child menu Expand. Post Reply. Chromecast Help Center. Please consider creating a new thread. That would prove my theory, and that it's safe to connect that way. Explore Our Forums. Skip to Main Content. If you have a Heat Pump system. You definitely need to consult the manual for your HVAC where the other end of the wires connect and look at where they attach on that board.