WD Curve scheduling Daikin Altherma

[Stephen_Crown]

@tiger_cook

it’s going to sound strange, but is there a cool down timer or narrowing of the DT before the HP ‘actually’ turns off with Pure WC, I turned off the HP at 10am, its off on the app and off on the MMI, but i can still see around 300W being consumed with 7 L/min DT 2 ish, 20 or so mins later

It could be a couple of things in my experience with the 9/11/14/16 variant of the Daikin Altherma 3M:

1. If outside air temperature at or below ~6C, then regardless of Space Heating mode (on/off), then then pump will run (compressor off) to circulate warm water to outside to prevent freezing

2. If outside air temperature at or below ~6C, then if you have Antifrost still enabled (think it’s a default and I turned mine off), then regardless of Space Heating mode (on/off), then not only will the pump run, but the compressor will run a lowest frequency for a short-ish period to get water temperature up to a failsafe level

In all cases including the above, the following pump control configuration should be looked at, with “Sample rather than Continuous” and “60% limitation on Sampling” modes strongly advised:

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] …