DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (http://www.diychatroom.com/)
-   HVAC (http://www.diychatroom.com/f17/)
-   -   Nest compatibility - Extra wire makes my furnace non-compatible? (http://www.diychatroom.com/f17/nest-compatibility-extra-wire-makes-my-furnace-non-compatible-149544/)

squal 07-08-2012 08:39 AM

Nest compatibility - Extra wire makes my furnace non-compatible?
 
Hope someone can answer this question.

My current thermostat has 5 wires: G, Rc, Y, W and 4.

On the Nest website they say my system is not compatible. After trying a different combination I found out that the reason for this is the wire with the number 4. In the nest compatibility test I had to open up a panel that said "more", since this type of wire wasn't even displayed when the Nest compatibility tester thing first appeared. The checkbox name is actually 1,2,3,4.

Does anyone know what this wire labeled as "4" is for? Could I somehow find a workaround for this? I have a gas furnace (Lennox g26 series, but I could get more specific if needed) and an AC (KeepRite softsound 1000+).

Thanks in advance.

stickboy1375 07-08-2012 08:52 AM

Quote:

Originally Posted by squal (Post 960558)
Hope someone can answer this question.

My current thermostat has 5 wires: G, Rc, Y, W and 4.

On the Nest website they say my system is not compatible. After trying a different combination I found out that the reason for this is the wire with the number 4. In the nest compatibility test I had to open up a panel that said "more", since this type of wire wasn't even displayed when the Nest compatibility tester thing first appeared. The checkbox name is actually 1,2,3,4.

Does anyone know what this wire labeled as "4" is for? Could I somehow find a workaround for this? I have a gas furnace (Lennox g26 series, but I could get more specific if needed) and an AC (KeepRite softsound 1000+).

Thanks in advance.

I've never heard of a (4) terminal, what does it land on at the equipment side? And what t-stat do you currently have installed?

hvactech126 07-08-2012 09:01 AM

Quote:

My current thermostat has 5 wires: G, Rc, Y, W and 4.

On the Nest website they say my system is not compatible. After trying a different combination I found out that the reason for this is the wire with the number 4. In the nest compatibility test I had to open up a panel that said "more", since this type of wire wasn't even displayed when the Nest compatibility tester thing first appeared. The checkbox name is actually 1,2,3,4.

Does anyone know what this wire labeled as "4" is for? Could I somehow find a workaround for this? I have a gas furnace (Lennox g26 series, but I could get more specific if needed) and an AC (KeepRite softsound 1000+).
what type of current thermostat do you have? make and model? Based on your equipment the nest should work. But I dont recommend the nest. Its just a bunch of big hype and there are much better thermostats out there that can do much more than the nest can. The only thing the nest does is program itself by logging how you adjust the thermostat throughout the day for the first week or so.

stickboy1375 07-08-2012 09:03 AM

Quote:

Originally Posted by hvactech126 (Post 960573)
what type of current thermostat do you have? make and model? Based on your equipment the nest should work. But I dont recommend the nest. Its just a bunch of big hype and there are much better thermostats out there that can do much more than the nest can. The only thing the nest does is program itself by logging how you adjust the thermostat throughout the day for the first week or so.

I like the nest, and it does more than just program itself, but I'm curious as to which t-stats you recommend?

hvactech126 07-08-2012 09:04 AM

It depends on the application.

stickboy1375 07-08-2012 09:07 AM

Quote:

Originally Posted by hvactech126 (Post 960579)
It depends on the application.

Im talking just typical one stage heat/cool systems... and of course, wifi accessibility, and an iPhone app. :)

hvactech126 07-08-2012 09:17 AM

ok, what functions do you want your thermostat to do. Programmable? Internet and mobile access? outdoor temp? Overcooling dehumidification? Do you have any additional accessories on your system such as humidifier or ventilation? Is your system located in a basement; would you like your thermostat to be wired with a wet sensor to indicate water on the floor and pop an alert? There are a number of questions that need answered as every installation is different.

Doc Holliday 07-08-2012 11:25 AM

never worked on or installed a nest before. I'm clueless. :(

stickboy1375 07-08-2012 11:44 AM

Quote:

Originally Posted by Doc Holliday (Post 960705)
never worked on or installed a nest before. I'm clueless. :(

Its a typical thermostat swap out, gets wired like every thermostat on the market, just comes packed with its own brain on running your equipment. :)

hvactech126 07-08-2012 11:51 AM

also, nest thermostats do not do well at all without a C connection.

squal 07-08-2012 01:40 PM

Quote:

Originally Posted by hvactech126 (Post 960573)
what type of current thermostat do you have? make and model? Based on your equipment the nest should work. But I dont recommend the nest. Its just a bunch of big hype and there are much better thermostats out there that can do much more than the nest can. The only thing the nest does is program itself by logging how you adjust the thermostat throughout the day for the first week or so.

Thanks everyone for the replies!

Maybe I don't need a Nest, but here's my need. I want to control my thermostat from outside my home. I don't want to buy extra gear to do this (like ZWave where I would need to buy a controller, am I correct?). I want to be able to check my home's temperature and override whatever temperature is set, or just turn the AC or Heating on if I want to.

I know Nest does some of those, not sure if all. But there is one good reason I might end up buying that one: my wife things it looks good and she'll allow me to spend $250 in a thermostat. While spending $170 in a Honeywell is not going to make her happy.

I would preferably want to use this with my Android phone, not the web. Also, the web interfaces for the ZWave apps are not very nice (not nice as in ugly and hard to use). There are some Android apps which look more promising.

As for my old thermostat, it's old as hell, that's why no one might recognize that number 4 terminal. It's one of those old mercury thermostats. Probably from the early 90's or late 80's. No programming of any kind and, of course, no Wifi. ;-)

stickboy1375 07-08-2012 01:43 PM

Quote:

Originally Posted by hvactech126 (Post 960734)
also, nest thermostats do not do well at all without a C connection.

They actually do, it's the equipment that may have an issue with a power stealing thermostat. :)

stickboy1375 07-08-2012 01:45 PM

Quote:

Originally Posted by squal (Post 960830)




As for my old thermostat, it's old as hell, that's why no one might recognize that number 4 terminal. It's one of those old mercury thermostats. Probably from the early 90's or late 80's. No programming of any kind and, of course, no Wifi. ;-)

Im betting your system is not even using the (4) terminal, but to verify, you would need to find the other end and see what it is doing. It may just be a common wire off the transformer, or capped off at the heating/cooling equipment.

hvactech126 07-08-2012 01:54 PM

You never answered make and model. Even a picture? Can't help if you don't provide info.

stickboy1375 07-08-2012 01:56 PM

Quote:

Originally Posted by hvactech126 (Post 960845)
You never answered make and model. Even a picture? Can't help if you don't provide info.

You think with todays technology a picture would be posted with every question....


All times are GMT -5. The time now is 11:41 AM.