I'd like to know Honeywell experts opinion anyway, that could save me a few pointless tests (I'm a bit lazy as well ) and maybe some stress for my boiler. I might try enabling compensation again to dig into it a little deeper and check some different set-up. or just once), allowing for a control setpoint higher than the limits. This didn't look too good to me, that's why I deactivated weather compensation at the boiler.Īctually my boiler would pass its temperature limit (max control setpoint) to the R8810, but appearently that doesn't make my EvoHome immediately aware of it (maybe the EvoHome reads it once in a while. After a few minutes water used to cool down enough for the boiler to fire again, that made temperature rise again to the limit and the cycle repeated.
#Honeywell evohome temperature compensation code#
Trying to reach the control setpoint, my boiler was reaching that limit and used to stop the flame, showing a control code (d2 on my boiler) that meant that water was hotter than the allowed maximum. Last year I played with this a bit, and I think sometimes the R8810 tried to send a control setpoint higher than the limit defined by the compensation curve at that outside temperature. What happens then is that the external sensor would modify the maximum water temperature that the boiler would provide, so when the outside temperature rises, the boiler would decrease the maximum water temperature. evohome Installation Guide 9 First, power up the evohome Controller emove the cover, remove the battery R tab and replace the cover. On the OpenTherm side, what I read on the wire is that my EvoHome sets a control setpoint (it also sets modulation levels, but I'm letting these alone for now, for sake of simplicity, this is going to be a long post anyway ) that's the temperature setpoint for the boiler to reach before turning the burner off. My boilre then reads the outside temperature and adjusts the maximum temperature accordingly. Yes, via Total Connect Comfort Intl App & evohome controller. The project is designed to be run on a Raspberry pi, but will build and run on a x86/64 machine too. outdoor temperature compensated control of single-temperature. It calls the Evohome API, Openweathermap’s API and integrates with healthchecks.io so you know if/when data stops being collected. The Honeywell CM921 is a wireless programmable room thermostat designed to control you. When I activate weather compensation on my boiler, I have to configure the min and max temp and the slope, that means the compensation curve. The mini project combines a Granafa, Influxdb and a Python container in a small docker-compose stack. Nor does it show an outside temperature on the controller screen. As far as I understand, my EvoHome doesn't even take note of it.
Right now I have the weather compensation disabled at the boiler, but the sensor is still telling the outside temperature to the boiler, that reports it to the R8810. I have OpenTherm up'n'running and I managed to set up both an outside temperature sensor attached to my Ferroli boiler and an OpenTherm gateway between my boiler and the Honeywell R8810 to monitor what's going on between them.
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