Trigger a disinfection cycle

[s0129]

Just wondered if anyone knew if it was possible to trigger a disinfection cycle programmatically. e.g. When electricity price is very low on Octopus Agile.

[Arnold-n]

As far as I know disinfection cycle cannot be triggered from the MMI or via P1/P2, but you can set DHW on/off, DHW temperature target, and boost on/off.

[mgaurilcikas]

@Arnold-n do you have ideas why I can't control DHW temperature via P1P2? I can turn it on and off, also trigger boost mode, but when I change DWH temperature, it does not take any effect on Daikin's side.

[Arnold-n]

On my EBLA, I can modify DHW on the Madoka or MMI or via HA, and the changes become available in all. But it might differ per system. Do you see manual changes back in HA?

[s0129]

Thanks I can modify the DHW temp but it doesn't seem to go any higher than 52c. Are you able to set the temperature to say 65c and the immersion kick in to reach this temperature?

[Arnold-n]

Can you change the DHW temp on the MMI to more than 52C?

I can set the DHW via MMI or HA to 75C ([6-0E], large tank). It may not start heating immediately due to hysteresis settings [6-08] and anti-recycle settings ([8-02]-[8-04]) but eventually it does.

[Arnold-n]

Not sure which version you are running, there was an issue with field setting history capture, can you retry with newest P1P2MQTT-bridge firmware and restart the Daikin after you installed the new firmware to see if the max value gets corrected?

[s0129]

The P1P2 seems to work the same as via the MMI. I can increase the tank temperature target temperature to 65C however I find the daikin never reaches this, it gets to 50c and turns off, even if I have boost on. Feels like a Daikin issue to me.

[Arnold-n]

The heat pump (compressor) cannot heat the tank above 50C or 55C depending on your model. Above that, the electric resistive heating element (usually 3kW) should take over.

[s0129]

Strange issue I am seeing is the heating element isn't taking over. I know the heating element works as if I enable boost it comes on, but only until ~50C, then it turns off.

[Arnold-n]

That's strange. I should kick in - though sometimes with quite a delay.

[s0129]

Would it work dynamically scheduled a disinfection cycle using the field settings?

hc_fieldsettings_2_00_a442_dhw_disinfection_operation_day
hc_fieldsettings_2_01_a441_dhw_disinfection
hc_fieldsettings_2_02_a443_dhw_disinfection_start_time

[Arnold-n]

A field setting change requires a Daikin restart. I would never use that for dynamically scheduling actions. Instead, it would be better (once it works) to change the DHW setpoint directly.