Home & Garden

Ecobee v1 to Nest v3

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  • Feb 11th, 2019 8:36 pm
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Sr. Member
Nov 17, 2014
771 posts
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Ontario
AV-Fishing wrote:
Jan 19th, 2019 9:37 am
I've had the Nest installed since December 2016 and haven't had any issues at all.

AC runs fine in the summer.

Heat works perfectly fine in the winter.

I just installed as per the manual that came with the Nest.

Furnace was original when home was built in 2006. We're the second owners.
Nice that you haven't had any problems, kind of surprising also. I would have thought your battery would drain out during the shoulder seasons when the AC and furnace aren't on very much. If you do ever have a problem at least you know what likely is.
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Oct 13, 2008
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Oshawa
Gee wrote:
Jan 20th, 2019 8:16 am
No furnace filter?
Left side of the furnace
Stress is caused by NOT fishing enough.
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[OP]
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Jul 4, 2009
915 posts
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Mississauga area
kittypink wrote:
Jan 18th, 2019 4:24 pm
I just bought the Nest Thermostat v3 to replace the Ecobee that came with the house and opening it up, I see the wires as C RH G and W and Y together.
So I wired it to the Nest as C RH G and I took out the W/Y coupling and just attached it to W.
So now I have heat, but no cooling. Should I put the coupling back together and put the Y part to the Y? In the Nest guide, it said to remove any jumpers, not sure if this qualifies as a jumper and not sure if I can be ruining anything.

Any help would be greatly appreciated!
thermo.jpg
kittypink wrote:
Jan 18th, 2019 10:28 pm
I have a gas furnace and central air.

On the old Ecobee that I uncovered, I only have 4 wires.
That set up has:
1. black wire going into C
2. red wire going into RH
3. green wire going into G
4. white wire going into a split of W and Y -- W going into W, and Y going into Y.

So what I did with the Nest is black wire going into C, red wire into RH, green into G.
The problem is the white wire. I removed the split and put the white wire into W, now I have heat and fan control but no cooling. I mean obviously I don't need cooling now, but I will come summer.
I don't know if I should put the white wire back into the split thing and split W and Y like how the old owners did it, but to me that looks wrong.
So just an update if anyone cares.

I thought that everything was fine wiring it up the way I did. The heat works and the fan works, although everything was taking so long. It was taking an hour to bring up the heat 1C and I thought maybe that was normal. We just moved into the house in the beginning of January and just getting use to what is "normal" for this house. I told my husband that I was concerned, but as with everything, he just shrugs if off and thinks I worry too much.

So we now have the Nest running for about 3 weeks. On average, the furnace runs 12+ hours a day, which I thought was a lot. I have the heat set at 22.5 during the day and 20.5 at night.

Yesterday, I was setting up a window mount bird feeder and happened to look down and noticed that my AC was running!!! Face Screaming In FearFace Screaming In FearFace Screaming In Fear

It turns out that the AC and furnace was both running at the same time. I have since turned off the circuit for the AC and have a HVAC guy coming tomorrow.

What do you think the chances are that I completely ruined my AC?
Deal Addict
Jun 16, 2009
1722 posts
441 upvotes
Woodbridge
Funny I recently UPGRADED my Nest V3 BACK to Ecobee V1.
OP you should have a common maker close to the furnace terminals. The device you see in your tstat that is connecting Y and R is known as diode.
Ecobee V1 is the best Tstat atleast IMHO. Coloured screen, FAN can be left ON permanently, 7 days weather forecast, Outside temp on same home screen.

https://mythermostatreviews.com/ecobee3 ... -kit-work/
With greater power comes greater difficulty in factorizing the polynomial.
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May 23, 2009
2181 posts
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Mississauga
kittypink wrote:
Feb 11th, 2019 3:04 pm
So just an update if anyone cares.

I thought that everything was fine wiring it up the way I did. The heat works and the fan works, although everything was taking so long. It was taking an hour to bring up the heat 1C and I thought maybe that was normal. We just moved into the house in the beginning of January and just getting use to what is "normal" for this house. I told my husband that I was concerned, but as with everything, he just shrugs if off and thinks I worry too much.

So we now have the Nest running for about 3 weeks. On average, the furnace runs 12+ hours a day, which I thought was a lot. I have the heat set at 22.5 during the day and 20.5 at night.

Yesterday, I was setting up a window mount bird feeder and happened to look down and noticed that my AC was running!!! Face Screaming In FearFace Screaming In FearFace Screaming In Fear

It turns out that the AC and furnace was both running at the same time. I have since turned off the circuit for the AC and have a HVAC guy coming tomorrow.

What do you think the chances are that I completely ruined my AC?
Not good news and being 3 weeks is very very likely your compressor is damaged.

This is one of the reasons I flip my A/C breaker off in the fall. No accidental turn on of the outdoor unit.
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Aug 22, 2011
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Ottawa
kittypink wrote:
Feb 11th, 2019 3:04 pm
So just an update if anyone cares.

I thought that everything was fine wiring it up the way I did. The heat works and the fan works, although everything was taking so long. It was taking an hour to bring up the heat 1C and I thought maybe that was normal. We just moved into the house in the beginning of January and just getting use to what is "normal" for this house. I told my husband that I was concerned, but as with everything, he just shrugs if off and thinks I worry too much.

So we now have the Nest running for about 3 weeks. On average, the furnace runs 12+ hours a day, which I thought was a lot. I have the heat set at 22.5 during the day and 20.5 at night.

Yesterday, I was setting up a window mount bird feeder and happened to look down and noticed that my AC was running!!! Face Screaming In FearFace Screaming In FearFace Screaming In Fear

It turns out that the AC and furnace was both running at the same time. I have since turned off the circuit for the AC and have a HVAC guy coming tomorrow.

What do you think the chances are that I completely ruined my AC?
Ouch.
As a habit during the winter, I flip the fuse upside down at the receptacle during the winter to ensure it never turns on at all.
[OP]
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Jul 4, 2009
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Mississauga area
newlyborn wrote:
Feb 11th, 2019 3:31 pm
Funny I recently UPGRADED my Nest V3 BACK to Ecobee V1.
OP you should have a common maker close to the furnace terminals. The device you see in your tstat that is connecting Y and R is known as diode.
Ecobee V1 is the best Tstat atleast IMHO. Coloured screen, FAN can be left ON permanently, 7 days weather forecast, Outside temp on same home screen.

https://mythermostatreviews.com/ecobee3 ... -kit-work/
Thanks newlyborn, that link was exactly how the old Ecobee was wired. My biggest mistake was removing the jumper and not understanding exactly how it correlated to the furnace end of it.

@bubuski & vkizzle
Yeah, turning off the AC circuit is an awesome idea. It never even occurred to me as something to do, but I will from now on.
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Oct 14, 2010
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kittypink wrote:
Jan 18th, 2019 4:24 pm
I see the wires as C RH G and W and Y together. So I wired it to the Nest as C RH G and I took out the W/Y coupling and just attached it to W. So now I have heat, but no cooling. Should I put the coupling back together and put the Y part to the Y?
kittypink wrote:
Feb 11th, 2019 3:04 pm
So just an update if anyone cares.

Yesterday, I was setting up a window mount bird feeder and happened to look down and noticed that my AC was running!!!
In your first post you said that you had no cooling, and now you have both cooling and heating at the same time. What did you do after making your first post. Did you reinstall the "coupling". I'm sure that your problem has to do with the "coupler" because the W and Y terminals from the thermostat are used to activate the heat and cooling respectively.

Did you follow my suggestion in post #9 to check if there was also a "coupler" device connected to the white wire in the furnace?
[OP]
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Mississauga area
Rick007 wrote:
Feb 11th, 2019 5:58 pm
In your first post you said that you had no cooling, and now you have both cooling and heating at the same time. What did you do after making your first post. Did you reinstall the "coupling". I'm sure that your problem has to do with the "coupler" because the W and Y terminals from the thermostat are used to activate the heat and cooling respectively.

Did you follow my suggestion in post #9 to check if there was also a "coupler" device connected to the white wire in the furnace?
I didn't change anything since my initial wiring. I took out the W/Y coupling and just attached it to W. On the Nest app, it only shows heating, so I thought I only had heating. So, although it only showed heating, it was actually calling both heat AND cooling, but I didn't know until I physically looked at the AC.

I did look at the coupler device on the furnace side and to me it looked like the same amount of wires going in and out, but I must have been confused, it was a jumbled mess.
Now I'm just letting a professional look at it. I honestly didn't think the mistake would be so costly. I thought it would be an easy and quick install, and the worse that can happen is that it wouldn't work, and I'd just reinstall the old thermostat back. Never did I think that it would call the AC to run while the heat was running. I didn't even think that was even possible.

And the funny thing is, I'm in IT. I do all the basic wiring in the house, all the network cable runs, entertainment setups. I do tech support for all my family, so installing a thermostat...how hard can it be, right?
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Oct 14, 2010
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kittypink wrote:
Feb 11th, 2019 7:28 pm
I didn't change anything since my initial wiring. I took out the W/Y coupling and just attached it to W.
Well I believe leaving out that device is causing your problem.

In post #9 I theorized that the device converted the 24 volt AC supply into positive DC when requesting heat, and negative DC when requesting cooling. The DC voltage was sent to the furnace on the white wire. At the furnace the plus or minus DC voltage was directed to either the cooling or heating terminal of the furnace (the W or Y terminals).

By leaving the device out of the thermostat you are not sending DC voltage to the furnace, but rather AC voltage. When the AC arrives at the furnace the "coupler" in the furnace will now send voltage to both the W and Y terminals. The result is you will have both heat and cooling at the same time.

The solution is to reinstall the "coupler" into the thermostat. You have probably done little damage to the AC compressor, because it probably runs 12 hours/day during summer heat waves without damage.
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Jun 16, 2009
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Woodbridge
AC should never run below 0 temp. It is not same as running it 24 hrs in summers. Refrigerant can migrate underneath oil in sub 0 temp. Best advise for OP is to turn the AC off from the breakers and keep the furnace going with same tstat. Have technician out in June end when AC can be tested properly.
With greater power comes greater difficulty in factorizing the polynomial.
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Oct 14, 2010
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newlyborn wrote:
Feb 11th, 2019 8:08 pm
AC should never run below 0 temp. It is not same as running it 24 hrs in summers. Refrigerant can migrate underneath oil in sub 0 temp.
That may be true, as I know very little about AC units. I suppose if the compressor was running over 12 hours/day that the oil and refrigerant would remain fairly mixed though.

I have read many posts on the Internet regarding people who want to keep a freezer in an unheated garage. I have not seen any replies that stated this would be detrimental to the freezer.

As you suggested, the OP should no longer run the AC unit until the warm weather returns. But rather than call a tech out to inspect it, I would recommend that she just run it normally until it does have a problem, which may be years away. There is no sense it getting something fixed if it ain't broke.

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