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Nest thermostat in David Weekly home
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Sabari N.Krishnan
Mueller Community

Posts: 20
Joined on October 24th, 2012
Nest thermostat in David Weekly home
by Sabari N.Krishnan on August 17th, 2013

Charles is right about the 'Envirazone' controller. It is the same one in our house. I had a conversation with the folks @ Christianson who installed our A/C and they said we need to replace the controller and install a new one to use NEST and quoted me $400 for that. It didn't make sense for us to proceed with it at that point.
 
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ianvarley
Mueller Community

Posts: 86
Joined on October 18th, 2008
Nest thermostat in David Weekly home
by ianvarley on April 16th, 2014

Tony, did you ever move forward with the Nest? I just bought one and discovered we have the exact same wiring (we're over on Mattie st., in a Stan Pac house), so I am considering returning it ($400, plus the cost of the Nest, doesn't make sense).
 
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Tony Clark
Mueller Community

Posts: 29
Joined on October 11th, 2009
Nest thermostat in David Weekly home
by Tony Clark on April 16th, 2014

Ian,

I did go ahead with Nest and installed a new controller board but instead of paying $400 for the board and installation I ended up ordering it directly from an HVAC parts store and installing with a little help over a weekend.

I wouldn't recommend it for everyone and I took a small risk by ordering a part based on a tip from another Mueller homeowner who got free installation from Pecan Street Project.

The new controller board was $150 from http://www.supplyhouse.com and it works perfectly with the Nest thermostats. If you're interested in doing the same I'll take some pictures of my old controller board and the new one so you can see whats involved and send you a link to the board that I purchased.

-Tony
 
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Tony Clark
Mueller Community

Posts: 29
Joined on October 11th, 2009
Nest thermostat in David Weekly home
by Tony Clark on April 16th, 2014

Ian,

I did go ahead with Nest and installed a new controller board but instead of paying $400 for the board and installation I ended up ordering it directly from an HVAC parts store and installing with a little help over a weekend.

I wouldn't recommend it for everyone and I took a small risk by ordering a part based on a tip from another Mueller homeowner who got free installation from Pecan Street Project.

The new controller board was $150 from http://www.supplyhouse.com and it works perfectly with the Nest thermostats. If you're interested in doing the same I'll take some pictures of my old controller board and the new one so you can see whats involved and send you a link to the board that I purchased.

-Tony
 
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ianvarley
Mueller Community

Posts: 86
Joined on October 18th, 2008
Nest thermostat in David Weekly home
by ianvarley on April 17th, 2014

Cool, thanks Tony! Yeah, I'd love to see a pic of the controller board and any notes on the installation. I'm not an electrician but this is low voltage stuff so I don't suppose I can probably do myself too much damage by trying. :)
 
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GP
Mueller Community

Posts: 282
Joined on September 17th, 2007
Nest thermostat in David Weekly home
by GP on April 18th, 2014

Ian,

I have replaced about 90 controller boards in Mueller (to the Honeywell Universal controller board) to allow for a 5-wire system.

If you have a 1-story home, the zone controller board is not necessary, and can be wired out. However, if you have a 2-thermostat home, you will need to upgrade it.

Although it is low-voltage, you need to cut the power to the furnace, else you can blow the fuse in the blower itself, which is a real bear to change. So, my only recommendation is to make sure that the breaker is off!

Good luck!
Grant
 
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ianvarley
Mueller Community

Posts: 86
Joined on October 18th, 2008
Nest thermostat in David Weekly home
by ianvarley on April 18th, 2014

Thanks Grant! We are in a one-story, glad to hear that we won't have to buy that. Do you have any recommendations for installers who could do this? Blowing blower fuses makes me a little nervous. :) We're Pecan St. participants, but didn't do this as part of that (I don't remember seeing that as an option but maybe I missed it).
 
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GP
Mueller Community

Posts: 282
Joined on September 17th, 2007
Nest thermostat in David Weekly home
by GP on April 21st, 2014

Ian,

Since you have a 1-story home, you just need to get an HVAC professional to unwire your controller board, and take the "5 wires" from the furnace to the thermostat. In all of the homes I have seen, the original installer left the bundle of wires in the wall (even though only 3 were used), so it was just a matter of wiring up 2 additional to complete a 5-wire system.

Thanks,
Grant
 
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sthoppil
Mueller Community

Posts: 40
Joined on May 11th, 2009
Nest thermostat in David Weekly home
by sthoppil on April 14th, 2016

Tony,
could you send me a picture of your setup - going to attempt this on my own so i don't have to shell out a few hundred to hvac person....i hope.
i attached a picture of the back of my thermostat currently and assume that is what your probably looked like

 
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dje7
Mueller Community

Posts: 81
Joined on March 2nd, 2009
Nest thermostat in David Weekly home
by dje7 on May 8th, 2016

Not to revive an old post, but I need to switch out the Honeywell Envirazone W8335A panel to a controller board that will be more compatible with a 5-wire thermostat.

We've got a two zone system (upstairs/downstairs), as well as a C7835 Discharge Air Temperature Sensor.

TIA.
 
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