Help with auto mode

[andreas-bulling]

Dear all,

I've searched a lot and found several discussions/issues that deal with the auto mode. But it seems getting it working properly is highly individual so I thought I'd ask here as well.

What I essentially want is very simple: The Daikin/Faikin should keep a target temperature in a room (let's say 22 degrees Celsius, with plus/minus 1 degree range). Ideally by running the AC continuously, just enough to compensate for the heat leaving the room through the walls.

This is tricky to do automatically, so what the auto mode currently does is that it switches the AC on and off based on some predictions and parameters (correct?) And this part is not working for me:

I use an external BLE sensor and that shows 21.08 degrees - so above the lower limit. Suddenly the AC turns on, heats up (set temperature something above 30 degrees), the fan turns on very high for a few minutes, then it turns off again. No change in room temperature whatsoever. This repeats multiple times throughout the day, even if the temperature never falls below the 21 degree mark.

Anything else I need to do or should this usually work?

Running the AC continuously (to not strain the compressor that much) and only adapting parameters on the fly to adaptively stear the room temperature around the target temp is not an option?

[revk]

There is also a thermostat mode you can set and some timing settings if you want to run longer and not short bursts.

Trying to "steer" around the temperature falls down because the Daikin itself is trying to do that as well, and so you can only change its operation by setting a temperature much higher or lower.

What you are asking for is basically the normal Daikin auto mode, which you can set - but that typically has a very wide temperature margin.

Hope that helps.

[andreas-bulling]

Thanks a lot for your help / answer. Which settings for the thermostat mode specifically would I have to set and how to make it run longer / with no short bursts?

[revk]

[MUN0X]

Indeed, use the thermostat mode and apply demand control. Demand control limits the max power and makes the heating cycles much longer. Playing with heatover can also help

[andreas-bulling]

With "demand control" you mean actively modifying the demand value (demand control is enabled in my case)? What is this ideally based on - room temperature and/our outside temp?

heatover I would probably increase to increase cycles (as it takes longer to reach higher temperatures), I assume?

[MUN0X]

Actively modifying, not really but set it as low as possible.
But still high enough that your unit is still able to heat your room comfortably fast.
In my case I run my unit at a demand control of 45 most of the time, Unless it is very cold outside, at <°5 it set 50 and <0°C it set 55.

As for the heatover,
that is basically a trick that the Auto-mode uses to force the daikin logic to do its wishes because there is no direct control.
For example, If you set 20°C as a setpoint in faikin-auto, faikin will set the daikin (internal) setpoint to 20°c + heatover (6°C by default) ==> 26°C (in reality it is more complex because of temptrack and tempadjust, but read documentation...)
By setting 26°C faikin-auto ensures that daikin will start heating since the setpoint is way above the current temperature.

This works but is a bit annoying as it trows the daikin logic completely out the window.
The daikin logic is designed to slowly ramp down as the temperature start to reach the desired setpoint. By setting a 6°C offset this is never the case and daikin will run at full blast (or as high as demand control allows it)
By lowering the heatover value to something lower you get some benefits of the internal daikin logic and the unit will reduce its power draw but the value has to be high enough that daikin keeps following the faikin-auto "on/off commands".
It takes some playing around but lower the heatover value stepwise and see if the unit keeps heating when the auto mode tells it to heat.
If the units stops heating when it shouldn't you've gone to low.

For reference I run 3 of my units (with BLE sensor) with following settings:

Another one is very agressive and needs a lower heatover:

All in thermostat mode of course.

[andreas-bulling]

And another "auto" related question: What would be a reason that I cannot set the fan speed to "night"? For one of the ACs it always goes back to "Auto" after a few seconds...

[revk]

There are different versions of S21 messages and different capabilities. We try and set it, but if the setting does not stick, it goes back. "Night" has been an especially problematic setting. It may depend how old the firmware is on the a/c.

[andreas-bulling]

I bought the indoor units together but of course not impossible that they are from different production batches and have different firmware. How can I check? Would it help if I provided a debug log to potentially get this fixed? I'd be happy to help as much as I can.

[revk]

The debug setting sends messages to mqtt for the S21 messages

[Steinwendener]

Dear All,

Thanks for this nice board. In my case I have also the FAIKIN in auto mode running with an BLE Tempsensor attached and the FAIKIN control the Mode of the AC. The speed of the FAN is setted to NIGHT. Everything works well. The only thing that disturb after a time the FAN speedup. In the sliping room in the night this noise wake me up. Is there a possibility to switch this funktion off.

Thanks for your answer

[MUN0X]

Enable nofanauto in the extra settings if the automated fan control bothers you. If short heating/cooling cycles bother you, you could enable thermostat.

[Steinwendener]

Thank you MUN0X,

I try this, but sometimes I got the Reaction show in the diagram. I never set the MODE to FAN, I hope this is some kind of setting and some one can help me to fix it. I like to run the FAN in modus NIGHT (around 520 rpm). Additionally i also add shots of the Parameter set.

Thank you for your help