Nest Separate O And B Wires

It's not clear where they should go. If you have a heat pump then similarly, the o and b are used to switch the heating side and cooling side, so that will change how you hook things up.

Demystifying Thermostat Wiring Colours What Goes Where

Even with nest tech support on the phone we couldn't get it working without the pulsing issue.

Nest separate o and b wires. If you have a wire labelled b but do not have a separate wire labelled o, connect it to the ecobee thermostat’s o/b terminal. We have 7 wires to connect to the nest. Take the blue wire and attach it to the orange wire to feed the nest 'c' terminal and make sure that the damper is closed and the nest is configured for straight air and gas heat.

Herein, is my heat pump o or b? If the o option is highlighted, select b. In the robert shaw 9610, o controls the cool active reversing valve and b controls the heat active reversing valve.

Your system won't be compatible if it uses separate o and b wires. O and b separate wire. I've installed a nest 3rd gen on the 2nd floor but the first floor has me baffled because of the o and b are separate wires but there is only 1 spot for o/b on the 3rd.

If i understand this correctly, you should have one or the other, not both. B is energized to turn heating on, o is energized in cooling. Google nest thermostats are usually compatible with zoned systems that use multiple thermostats, including zoned systems with dampers.

If your o or b terminal shares a label with another wire, typically w, you’ll need to identify whether you have a heat pump system or not. The wires from the controller to zone 1 tstat include o and b and the unit says they tell the furnace whether to be in cool or heat mode. Sometimes it might be a single o/b wire instead of two separate wires.

Some systems have separate o and b wires. On heat pump systems, the o and b wires tell the compressor when to switch between heating and cooling your home. Some heat pump systems can provide auxiliary heat.

Nest and separate 24v transformer on one side of the relay and the thermostat wires from the boiler on the other. When programming the new thermostat, select option 2 for system type (page 18 of your manual). Nest isn't compatible with systems that use both heat and cool active valve wires.

In the end i had to add a relay to electrically separate the nest from the boiler. Red, green, black, yellow, blue, orange. Brown or white (or both)?

This programming should make the o and b wires operate the same as your old stat. If you're unsure you can also check your system compatibility using the compatibility checker tool. Connect the b wire to the c terminal.

If the b option is highlighted, select o. O/b wires are typically orange, but you should not rely on color alone to determine the function of a wire. Honeywell model hz311 will work with nest and ecobee, and you will see that you don't need a separate o and b wire.

D dermanj registered joined sep 8, 2008 3 posts discussion starter · #4 · sep 12, 2008 The nest thermostat defaults to an o orientation for heat. This is a picture of our current thermostat wiring.

Nest heating & cooling thermostat installation & wiring: Cottage has an older zone control system model 6203 by perfect temp (which is aprilaire now i believe). O and b control the heat pump reversing valve.

Have a nest at home and it works great so i'd like to use one at the cottage. Click to see full answer. So it can use the same terminal for o or b (o/b.)

Connect the o wire to the o/b terminal. Ecobee thermostats are compatible with heat pump and dual fuel setups, provided your system uses a single o/b wire. Emergency heat is usually used when it’s too cold outside for your regular heater to keep your home.

However, some zoned systems that require thermostat damper control aren’t compatible with nest thermostats, while other zoned systems may need a c or common wire, or the nest power connector, to be compatible. Ask your own hvac question Sorry, i missed you pictures in the last update, i'll take a look and let you know.

We originally installed the wiring in the nest as: If you have separate wires for o and b, you will want to tape off the b wire so it can’t make contact, and the o wire will be connected to the o/b terminal on your thermostat. In general if you have a b and an o wire, look up the manual.

A nest thermostat’s star connector or o/b connector can be used to control several different system functions, depending on what type of system. Test your heating and cooling once again to make sure the issue is resolved. Nest assumes that your y1 wire will be used to activate 1st stage heating and cooling for your heat.new house old tech.

White to w1, yellow to y1, green to g, red to rh, blue (tried in c as thought maybe this was a common, but did not work, so kept it unconnected as it had been on the honeywell), and brown to o/b. I'd love to be wrong! I spoke with a nest employee via chat on their website and she seemed to say that our system was compatible only we would need to get a pro to come and join the o and b wires into the *ob terminal on the nest.

On many other thermostats, the o wire is typically connected to a terminal marked w on one side and o or o/b on the other side; The brown o/b is the point of confusion. The e wire turns your emergency heat on or off.

The o wire reverses the valve from heating to cooling, and the b wire switches the valve from cooling to heating. The w is for use with a conventional system (furnace) while o/b is for use with a heat pump. I've got a separate c wire.

Ecobee support looked at the pictures and told me the presence of both o and b wires were the problem. Some thermostats have an e connector. Newer smart thermostats probably have a configuration setting for that.

You need to disregard that damper until you can have a professional install an upstairs thermostat and zoning system. What does ob mean on nest thermostat? Many thermostats label the 24v common wire as b and those systems can work with nest.

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