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Nest thermostat in David Weekly home
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cespurgeon
Mueller Community

Posts: 22
Joined on August 2nd, 2008
Nest thermostat in David Weekly home
by cespurgeon on May 9th, 2016

About two years ago I replaced the Envirazone W8335A panel in my two story Stan Pac house with a Honeywell HZ311 TrueZONE panel:
http://www.supplyhouse.com/Honeywell-HZ311-TrueZONE-HZ311-Panel-11490000-p

This controller made it possible to connect a pair of 5-wire wi-fi enabled thermostats to the system. My two story house has a Carrier HVAC with two zones and no DAT, although the HZ311 has provision for a DAT connection. I'm not sure what company made the zone control dampers, since they're buried inside the ductwork and not easy to access.

To change this out requires that you can get to all the cables in the attic and are willing to rewire your AC system. I took pictures before changing anything to document how things are connected.

Along with the new zone controller, I installed two Honeywell RTH9580 5-wire thermostats since the old thermostats won't work with the new controller. So this project requires changing the controller and thermostats at the same time.

I decided to go with Honeywell since there were a few reports in forums about the Nest having an occasional issue with some AC systems, and I wanted to avoid any more AC problems. Also, I wanted to set the thermostats for 1 degree up or down without hassling with the Nest software which apparently has a mind of its own on such things (or so I was given to understand from some reviews).

So far the Honeywell thermostats have worked OK. Nothing fancy like the Nest, but solid operation and available over the wi-fi network in the house (and Internet via phone app).
 
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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 May 10th, 2016

My installation was similar to cespurgeon. The existing Envirazone W8335A controller is a proprietary controller that only works Honeywell 3 wire thermostats. Without swapping out the controller you won't be able to configure the Nest thermostats which require a 5 wire setup in our homes.

I purchased the same Honeywell HZ311 TrueZONE Panel that cespurgeon did.
http://www.supplyhouse.com/Honeywell-HZ311-TrueZONE-HZ311-Panel-11490000-p

I've got some before and after photos which show the wiring up of the new controller board and the corresponding wiring of the Nest thermostats. I'll dig them up and post them tonight.

It's pretty straight forward so you should be able to do it on your own with a little bit of elbow grease.

-Tony
 
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dje7
Mueller Community

Posts: 81
Joined on March 2nd, 2009
Nest thermostat in David Weekly home
by dje7 on May 12th, 2016

Awesome. Photos would be great. I already have a DATS, but it's the three wire one (C7835A), so I think if I want to keep a DATS I'll have to use the kit which contains the C7735A sensor.

I think I also have an external temp sensor - Did either of you have one? Currently it is connected through an Outdoor Sensor Interface Module #50022037 which interfaces with a C7089U temperature sensor. I think with a Nest it uses local weather conditions from the internet, as does (I think) the RTH9580, so I'll likely be able to ditch that piece if I go with an internet connected thermostat.

Thanks. :)
 
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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 May 12th, 2016

I didn't have to run any additional wiring from the controller in the attic to my thermostats. What I found was that after removing the Honeywell Thermostat and corresponding mounting plate from the wall the actual cabling contained all the necessary 5 wires. It was just that only 3 were pulled through to the Honeywell TS.

See attached pictures for proper wiring. I'll post the controller wiring next.
 
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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 May 12th, 2016

For the controller setup the original Honeywell Setup had a DATS but I choose to ditch it. More lazy than anything else.

What you'll see in the OriginalHoneywellController.jpg picture is the equipment wiring on the far left and right of the board. The HVAC equipment has 4 wires (orange, white, yellow green) and the Controller power has two wires (red and blue). The bottom left wires are for the dampers and the bottom right wires are for the thermostats. In my system Enviracom 1 & 2 were the thermostats, Enviracom 3 was the DAT sense. I'm not 100% sure that it was hooked up correctly in the first place and chose to discard the DAT going forward.

Then I had two red & white bundles for the dampers and another set of two red, blue, white, yellow & green bundles for the thermostats.

On trick was making sure that I had hooked up the right damper with the corresponding thermostat. For that I made sure to only hook up one set at a time. Verified that the Nest was powering up and working and turned on the AC. Then checked that the damper was pushing air out the right zone. Bit of trial and error and everything worked fine.

I agree with your earlier comment. The external temp sensor is a bit redundant once you add in the Nest. It's probably more accurate by a degree or two but I doubt that will make a difference.

Overall it took me about 2 hours of fumbling around to finish the job. Better to do it now than when the heat really starts to come on. Lemme know if you have any questions or need another angle.

-Tony
 
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dje7
Mueller Community

Posts: 81
Joined on March 2nd, 2009
Nest thermostat in David Weekly home
by dje7 on May 19th, 2016

I noticed that I had a "C" wire coming into the Envirazone from the 24V terminal block on the furnace, which I disconnected and capped off. Everything else was a very easy change out.

http://s3.supplyhouse.com/manuals/1249544894162/Honeywell-w8835a-Product-Data.pdf
http://dms.hvacpartners.com/docs/1009/Public/02/58ST-5PD.pdf

I ended up with the Ecobee 3, since I like the remote sensor ability. Also applied for rebate from Austin Energy online.

Thanks for the photos. So helpful and they helped give me the confidence I needed. :)

Daniel
 
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