Bryant Evolution Thermostat

Configuration
1

Hi, very new to Home Assistant and wondering whether there is a way to integrate the Bryant Evolution thermostat with Home Assistant? Thanks!

2

You may want to follow this thread. Carrier Infinity integration as works similar to Bryant.

3

thank you for your response… this is way over my head. I guess I have to wait until Bryant provides an open API. Thanks!

4

I’m not have the great success that the rest of the people are having. The first thing I tried to do was see if I could see the packets streaming. To do this, I got an OrangePi with a 32GB microSD card and an USB to RS485. I loaded the OPi ubuntu sever OS. Since 24VAC is there I got a 24VAC to 5VDC power supply. I used the program screen observe the traffic on the RS485 bus.

Before I went up in the attic, I did a test and ran data between my PC (using putty) and the OPi. My BAUD rate was 9600 To emulate the 24VAC I used a 120 to 12VAC 40VA transformer This all worked as expected.

When I connected to my heater (Bryant Model No. FE4ANF005L00EEAA): A to A, B to B, C and D to AC-IN a lot of magic smoke was released. The heater wasn’t damaged, and I was able to revive the microSD card. Power supply, OPi and RS484 adapter were all rendered not functional.

This time I took out my oscilloscope to check the wave form from A to B. To ensure that I didn’t have grounding conflict, I plugged the O’scope into an isolation transformer. I put the 'scope ground on B and the probe on A. Yup! Some serious differences

Waveform USB-RS485
Waveform of the USB-RS485 (19200 BAUD)
Waveform heater
Waveform of the heater

You’ll note the USB-RS485 is ~ -0.2V to ~ +2.5V and the heater is ~ -3.5 to ~ +3.5

I notice that the power supply is not isolated, The AC goes into a full wave rectifier, and the negative side of the rectifier is DC V- That’s what probably did me in. I now have an isolated 120AC to 5VDC 700mA power supply (OPi needs about 300mA).

But I’d still like to know if it’s OK to connect the USB-RS485 up to the A and B?

Anybody out there have any thoughts?

5

I went ahead and tried the connection using an isolated power supply. I guess that part could be called a success because nothing lost its smoke. But the serial information is coming out as gibberish. I’ve tried a number of different BAUD rates to no avail.

From the oscilloscope, the BAUD rate is about 23400. which makes me think that the BAUD could be non-standard and/or the data is binary.

Anybody with any thoughts?

OSD