Nest E and Bryant SYSTXBBECN01-A

Old 12-27-17, 08:02 AM
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Nest E and Bryant SYSTXBBECN01-A

I'm looking to upgrade our home's HVAC system to utilize the new Nest E that recently came on sale at Best Buy. Before I purchased the product, I ran through the compatibility checker and it appeared everything checked out. Got it home, wired it up according to the provided wiring diagram, and the Nest worked great, except it would never turn the AC or Heater on. After messing around a bit, I finally reached out to Nest support and upon reviewing the picture of my original wiring they told me I had proprietary wiring and that Nest would not work. Can anyone tell me if there is a workaround or other option before I return this? I have a dual zone system, controlled via a dampener. The main thermostat is a Bryant SYSTXBBECN01-A. Here is a picture of the original wiring on that thermostat.
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Old 12-27-17, 08:40 AM
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Since you have a zoning system.... we'd need to see a picture of the zone board that should be attached near the air handler.

What kind of system do you have ?
Furnace, heat pump, heat pump with back up electric.
Old 12-27-17, 09:28 AM
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I'll try to figure out how to get a picture of that. The system is not that old. Our house was built 4 years ago if that helps.
Old 12-27-17, 10:22 AM
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That nest thermostat cannot do a fraction of what your existing thermostat can

Your existing thermostat can look at the model number of the outdoor unit and furnace and configure the furnace for the correct airflow , overriding the dip switches. It can also ramp down the RPM of the blower when only one zone has a demand.

On some models ( 19SEER) it can control the outdoor unit and air handler to deliver 5 stages of cooling,
( Depends on what it is controlling)

It can display any existing or past system faults.
It can display blower RPM and the external static pressure.
You can place a gas furnace in test mode at that stat and see the furnace ignition sequence in real time.

If you want wifi capability there is a wifi model of that stat.

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