Change (temporarily) Heating Temperature (but not the permanent heat/eco/nofrost temperatures)

[bergteam]

I am not sure if this a Bug or a Request for Improvement.

DESCRIPTION

I have a Junkers Boiler with FW120 Thermostat.
The Thermostat defines the heat/eco/nofrost temperatures and changes between them based on the daily schedule. The result is stored under "hc1 selected room temperature". I include sample temperatures in order to better describe my point.

a) Current Setting
+ hc1 heat temperature 21,5 °C
+ hc1 eco temperature 14,0 °C
+ hc1 nofrost temperature 5,0 °C
+ hc1 selected room temperature 21,5 °C

I would like to temporarily set the temperature to 21,0°C but not change the permanent (heat) temperature.
b) on the Thermostat FW120 I turn the knob and the following setting appears.
+ hc1 heat temperature 21,5 °C <= this does not change
+ hc1 eco temperature 14,0 °C
+ hc1 nofrost temperature 5,0 °C
+ hc1 selected room temperature 21,0 °C <=only this
=> wanted behavior.

c) if I try the same on EMS-ESP by changing "hc1 selected room temperature" the following appears. Note the programm is currently in mode "heat".
+ hc1 heat temperature 21,0 °C <= temp also changed
+ hc1 eco temperature 14,0 °C
+ hc1 nofrost temperature 5,0 °C
+ hc1 selected room temperature 21,0 °C
=> not wanted behavior. Why was permanent "hc1 heat temperature" changed?

CURRENT BEHAVIOR

When changing the "hc1 selected room temperature" value also the permanent value of the current heating mode is changed.

EXPECTED BEHAVIOUR

When changing the "hc1 selected room temperature" only this value is changed.

SOFTWARE/HARDWARE

Version 3.7.2-dev.10
Platform ESP32-16MB (-PSRAM)
Release Type Development

[MichaelDvP]

Most thermostats have a special field in the setting telegrams to set the temporary value and we use it for seltemp. But sadly for the junkers thermostats we have not found a way to set the temporary setpoint.
It's published in telegram 0x16F, offset 2 (int16), but the settings 0x165, 0x179 only have the settings for the permanent values.
If you find a way to set the temporary value via ems-bus we are happy to implement it.

[bergteam]

Maybee someone from the community has the FB10 - Remote Thermostat - installed and could log it. According to the User Manual this device does control "hc1 selected room temperature" on the main thermostat (e.g FW120). I will also try to get hold of one.

Screenshot from FB10 - Installations- und Bedienungsanleitung

[MichaelDvP]

Afair this is telegram 0x123 offset 2, but it has to be sent from a remote device: 0x18 for hc1, 0x19 for gc2, etc.
Don't know if we have to register the remote to the bus before sending.

You can try with send raw telegram: call system send "18 10 FF 02 00 23 2A" for 21 degrees seltemp (0x2A = 42 => 21°)

Checked old posts, the 0x123 was reported for a hc2, maybe hc1 use telegram 0x122. Then you can try to send from ems-esp custom entity:

[Sbried]

What I know, maybe that helps:
0x0122 is the control telegram sent from FWxxx to the FB10.
Offset 0: RoomTempInfluence enabled=-1, disabled=0
Offset 1: Requested room temp used by FB10 with active room influence, int8 range 0...60, resolution 0,5°C
Offset 2: Requested room temperature offset used by FB10 with inactive room influence, int8 range -10...10, resolution 0,5°C

0x0123 is the control telegram sent from FB10 to the FW1xxx heating circuit.
Offset 0: Current room temperature int16, resolution 0,1°C
Offset 1: Requested room temp sent by FB10 with active room influence, int8 range 0...60, resolution 0,5°C
Offset 2: Requested room temperature offset sent by FB10 with inactive room influence, int8 range -10...10, resolution 0,5°C

[bergteam]

That sounds promising. But unfortunately made no difference in any temp values set.

My Settings

• hc1 control device = FB10
• hc1 room influence = intern (also tried setting to extern, not sure about the impact, nothing observed)
• FB10 => hc1 RF room temperature sensor 21,8 °C (ems-esp.0.thermostat.hc1.remotetemp) filled with iobroker

Configured as suggested

Settings done.

1. Send 0x0123 with Offset 1 and 2 set to 5 => Succesfully executed. No change on any settings
2. Changed "hc1 room influence" from intern (default) to extern
3. Send 0x0123 with Offset 1 and 2 set to 5 => Succesfully executed. No change on any settings