Daikin Altherma, ESPAltherma & Home Assistant with OpenEnergyMonitor

[Stephen_Crown]

@squarepeg77

I see my pump draw up to ~190W when not heating but pumping at 27-30 litres per minute.

Have you got the pump speed restricted? Or just really low resistance pipe work?!

Hi @squarepeg77

This post over here might be useful. I covered the pump limitation when sampling - 60 % parameter and value in these threads:

Daikin LWT

Hi @datoon, That’s good to hear things are moving in the right direction and you’re understanding your system. Going down to about 10-11l/m is consistent with the others on here with the “9” and “11” model designation of the unit you have. And entirely expected. Flow rate is a big part of the heat output equation. To illustrate that, below shows the heat output (kW) at 30l/m which you said you’ve seen: [IMG_8267] The below shows the flow rate you’re now seeing at “steady state” [IMG_82…

And here:

Daikin Altherma 3 - Pump settings for Open Loop Design

I believe these are the sections relating to our Daikins (EDLA models) I use LWT mode with the following parameter set: “Sample” (I turn the heat pump off during milder periods to prevent excessive standby electricity usage ) and also the following parameter: “Pump limitation to 60% during sampling” this runs the pump at 60% electrical power input for sampling (more than enough!) and also becomes relevant when it gets to ~7C as the sampling occurs even when “turned off” FYI: [IMG_8118] …