NEST thermostat

[Vertnut]

The nests really interest me, but it would take awhile to save the $500 2 units would cost to install. If anyone gets some real world numbers, I would love to see them


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Even if it saved $8-$10 a month (and it won't in my house), we're talking 5 years.

[mirefire 2.0]

Anyone do an install yet? I pulled my cover off and checked the compatibility with what wires I have hooked up. It says take a picture and send it to them when I enter my wires on the website.

I have changed a lot of other thermostats but this one throws me (the one installed now) It has the two mercury tubes in it and the color of the wires is not in sync with the holes they are plugged in. I was going to replace this slide bar type with a digital one anyway but now I am not sure. I want to do a NEST and my system is a simple but now I am afraid of putting a normal digital one on it now after looking at it.

See above... I installed mine.

Was fairly straight forward. The color of the wires don't match with the letters, just make sure that NEST support knows which terminals you have wires going into... that will let them know if you are compatible with the unit.

[raider5.0]

After having mine for half a week I have to say its super easy to install, and the features are great.

We don't really have a set schedule do to our work, so its really nice to be able to set the thermostat while away and being able to cool it down before we get home.
The energy monitoring is nice added bonus to see how long each day the system is on the "GreenLeaf" (energy saving zone).

[Ratt]

Digging up a two year old thread here, but...

Wife wanted to try a Nest thermostat, so we bought one for downstairs to try before we bought a second to put upstairs. We also had a tech come out The other day to fix our broken heater, which is a heat pump I think, who said if we wanted, he would install it for $50. I'd rather do it myself than pay someone. He mentioned that we have a dual fuel (NG and electric) unit, that was modified to run on only NG and to just completely bypass electric, since the gas is more expensive. So, we just picked up the Nest yesterday, so I pulled our old thermostat open and see this:



If I were going to set it up to work with Just gas, which letters here should I be paying attention to? Or does it matter?

I'm assuming the Y/Y1 wire goes in the Y1 on the Nest, the G and C go to the G and C on the Nest, And the O/W2 goes to the W2 on the Nest, but which R* does the R wire go to on the Nest? RC or RH?:



I emailed the picture to the Nest support email ilke it asked, and they said they'd get back with me in 1 business day, but I don't want to wait that long. Thanks for anyone who can help me out.

[8mpg]

R should go to Rc. Its the power wire for the nest. Google your situation, there are tons of help threads for installing it. I had to google mine because Rheem is a little different on their heat pumps compared to most companies.

I got mine as a gift for our remodel and I have to say I really like it. I check it on my phone all the time to see the temp and humidity. Its only run 1.5 hours in the last 1.5 weeks

[turboskull1]

Digging up a two year old thread here, but...

Wife wanted to try a Nest thermostat, so we bought one for downstairs to try before we bought a second to put upstairs. We also had a tech come out The other day to fix our broken heater, which is a heat pump I think, who said if we wanted, he would install it for $50. I'd rather do it myself than pay someone. He mentioned that we have a dual fuel (NG and electric) unit, that was modified to run on only NG and to just completely bypass electric, since the gas is more expensive. So, we just picked up the Nest yesterday, so I pulled our old thermostat open and see this:



If I were going to set it up to work with Just gas, which letters here should I be paying attention to? Or does it matter?

I'm assuming the Y/Y1 wire goes in the Y1 on the Nest, the G and C go to the G and C on the Nest, And the O/W2 goes to the W2 on the Nest, but which R* does the R wire go to on the Nest? RC or RH?:



I emailed the picture to the Nest support email ilke it asked, and they said they'd get back with me in 1 business day, but I don't want to wait that long. Thanks for anyone who can help me out.

You'll still need to set the Nest up as a heat pump thermostat, something has to power the reversing valve for your outdoor unit or it will not work correctly in cooling. Here's the breakdown of the wiring- RH, RC, it supplies one side of your 24v. Y or Y1 is the wire that energizes the contactor outside for compressor operation in cooling or heat pump mode. G controls the indoor blower fan. W2/O controls either the first stage of electric heat, or powers the reversing valve if the thermostat is set up to control a heatpump. C is the other half of your 24v.
What makes your situation unique is its duel fuel that someone has bypassed to run only on gas, so I'm under the assumption that they've modded the dual fuel circuit board to lockout the heatpump. If I was in your situation I'd wire the new thermostat exactly as the old one was, and be sure to set it up as a heat pump in the installation menu. After installation you need to verify each mode of operation, with an emphasis that the heat pump does not run in heat.

[Ratt]

You'll still need to set the Nest up as a heat pump thermostat, something has to power the reversing valve for your outdoor unit or it will not work correctly in cooling. Here's the breakdown of the wiring- RH, RC, it supplies one side of your 24v. Y or Y1 is the wire that energizes the contactor outside for compressor operation in cooling or heat pump mode. G controls the indoor blower fan. W2/O controls either the first stage of electric heat, or powers the reversing valve if the thermostat is set up to control a heatpump. C is the other half of your 24v.
What makes your situation unique is its duel fuel that someone has bypassed to run only on gas, so I'm under the assumption that they've modded the dual fuel circuit board to lockout the heatpump. If I was in your situation I'd wire the new thermostat exactly as the old one was, and be sure to set it up as a heat pump in the installation menu. After installation you need to verify each mode of operation, with an emphasis that the heat pump does not run in heat.

So what you're saying is...it might be worth it to pay this guy 50 bucks to install it...

I mean, all I really need to know is which side the R wire goes into, RH or RC.

[turboskull1]

So what you're saying is...it might be worth it to pay this guy 50 bucks to install it...

I mean, all I really need to know is which side the R wire goes into, RH or RC.

Red goes to RC, I'd be surprised if there wasn't a factory jumper installed between RH and RC, if there is leave it in place.

[90GT50]

Digging up a two year old thread here, but...

Wife wanted to try a Nest thermostat, so we bought one for downstairs to try before we bought a second to put upstairs. We also had a tech come out The other day to fix our broken heater, which is a heat pump I think, who said if we wanted, he would install it for $50. I'd rather do it myself than pay someone. He mentioned that we have a dual fuel (NG and electric) unit, that was modified to run on only NG and to just completely bypass electric, since the gas is more expensive. So, we just picked up the Nest yesterday, so I pulled our old thermostat open and see this:



If I were going to set it up to work with Just gas, which letters here should I be paying attention to? Or does it matter?

I'm assuming the Y/Y1 wire goes in the Y1 on the Nest, the G and C go to the G and C on the Nest, And the O/W2 goes to the W2 on the Nest, but which R* does the R wire go to on the Nest? RC or RH?:



I emailed the picture to the Nest support email ilke it asked, and they said they'd get back with me in 1 business day, but I don't want to wait that long. Thanks for anyone who can help me out.

It doesn't matter. I installed one this weekend, both R connections are internally bridged according to nest.

If your old thermostat had a wire between its Rh and Rc connectors (a wire that did not go into the wall), do not use this wire with the Nest Learning Thermostat. The Nest Thermostat's press connectors are built so that only one wire can be inserted per connector. The Nest Thermostat won't work if you insert jumper wires.

Instead of using jumper wires, the Nest Thermostat has an automatic internal jumper between the Rh and Rc connectors. Your Nest Learning Thermostat will activate this internal jumper if your system needs it. For example, if both an Rh and an RC wire are connected to the Nest Thermostat, the Nest Thermostat will not jumper these connectors together. But if the system has both heating and cooling and only one R wire, the Nest Thermostat will automatically jumper Rh and Rc.

http://support.nest.com/article/How-do-I-install-Nest-if-my-old-thermostat-had-a-short-wire-connecting-Rh-and-Rc

[Ratt]

So, I just finished the installation. I put the Y/Y2 wire in the Y2 spot on the nest wiring block, and when I went through the setup it told me that I had to put it in the Y1 spot because you can't have a Y2 without a Y1, so I did. Cools okay, can already feel it, hopefully it will heat okay.

[kpc01]

the Y definetely goes to Y1 on nest. I'd say the O/w2 needs to go to the o/b on nest. this is probably your reversing valve, and the W1 will serve as you aux or emergency heat. I work for a hvac manufacturer and we are launching a new Wi-fi right now thats pretty nice. It will compete with nest but we sell thru wholesalers rather then HD or lowes.

Your cooling will work fine but your O/B terminal has to be hooked up to change over to heat so I'm guessing your O/W2 needs to go there. As mentioned earlier, RC and RH are only for dual transformer systems which are very rare down South so you can put it in either.

[turboskull1]

the Y definetely goes to Y1 on nest. I'd say the O/w2 needs to go to the o/b on nest. this is probably your reversing valve, and the W1 will serve as you aux or emergency heat. I work for a hvac manufacturer and we are launching a new Wi-fi right now thats pretty nice. It will compete with nest but we sell thru wholesalers rather then HD or lowes.

Your cooling will work fine but your O/B terminal has to be hooked up to change over to heat so I'm guessing your O/W2 needs to go there. As mentioned earlier, RC and RH are only for dual transformer systems which are very rare down South so you can put it in either.

O/B has to be hooked up for cooling to work, reversing valve is energized for air conditioning operation, they designed the systems to operate this way so if the operating coil failed it would still function as a heater.

[kpc01]

Sorry I always thought it was up to the manufacturer. the way I was taught was O energized it for heat and B energized it for cool. But part of being a rep is I'm not in the field to see real life stuff lol

[yellowstang]

Bumping this up.

So how do ya'll that have a Nest like it? I'm thinking of ditching the stupid one I have. The schedule works great, but if anyone changes the temp, it automatically HOLDs that new setting and will stay there until you hit the Program button to unset that HOLD. Fucking pisses me off! Especially since we have house guests and she seems to change it if she wakes up earlier than the AM program kicks it up a few degrees so it's warm when we get out of bed... Grrrrrrr...

Does it automatically know the difference between heating and cooling the house so you don't have to flip a switch on it? Like my current thermostat (some Honeywell model) is either on heat or cool. So, like if I tell it to keep the house 73 degrees, it will either use heat if it is cooler than that, or AC if it is warmer than that???

[Binky]

Bumping this up.

. So, like if I tell it to keep the house 73 degrees, it will either use heat if it is cooler than that, or AC if it is warmer than that???

I am continually surprised that this is a rare feature.