boiler emergency temerature range incorrect

[pswid]

I've updated firmware from old v.3.3.1 to the latest beta v3.4.2b2. New version is awsome! Good work.
However in home assistant log I noticed a lot of errors:.

ERROR (MainThread) [homeassistant.components.mqtt.number] Invalid value for number.boiler_emergency_temperature: 30 (range 40.0 - 70.0)

It seems that range 40-70°C is incorrect (at least for heatpumps) because this temperature in my Buderus WSW196iT is set to 30°C

[proddy]

thanks for reporting, we'll fix it

[MichaelDvP]

@pswid Please check and report the possible min/max from your boiler.

[pswid]

I don't see such parameter in the settings menu. I don't know if there is any hidden service menu and if so, how to get to it. Maybe emergency mode doesn't apply to heat pumps at all (only gas/oil burners?) and temperature 30°C is just a default value stored in the module at factory?

[MichaelDvP]

If the default is 30°C, the minimum should be lower. I don't know what emergency mode is and what is do, my boiler does not have this. The value was added in #515, maybe @tp1de can check the right minimum (or we use 0°C which is safe for a uint).

[tp1de]

My KB192i Gasboiler has a minimum of 40°C. But I think it may be a good idea to set it to a lower value. I would recommend at least 15°C. Emergency heating with less does not make sense.

[MichaelDvP]

@tp1de Can you please explain what this emergency heating do? Or link a manual where it is described.

[tp1de]

emergency mode = German "Notbetrieb" = manual operation mode to set manually the boiler flow temperature.

It can be used if RC310 is not working anymore, an out- or indoor temperature sensor is not working ... so if the automatic control mechanism do not work anymore.

I believe that the min and max flow temp to be set is set by the heating system. Since min/max in ems-esp is defined for the data field independent from the boiler type I recommended a min flow temp of 15°C.

This emergency operations mode ("Notbetrieb") is a part of the RC310 user mode parameters.

[MichaelDvP]

@tp1de Thanks, on my older ems controller

this is simply setting the right knob to a fixed flow temp (sets offset 1 in boiler-telegram 0x16, heatingtemp). Only in setting to "auto" the flow temp is controlled by thermostat.

I think the minimum depends on heating type, for radiators 40-70 is ok, but floor heating works with lower temperatures, so 15°C as minimum will be ok for all heating types.

[pswid]

Problem fixed. Thanks.