Unfortunately not - don’t have any proper monitoring. I’m logging LWT via API every 10 mins, and the energy consumption from CT clamp from Zappi. Things like flow rate and return temperature I’m having to eyeball from the MMI.
Something I want to investigate is whether I can interrogate system parameters over bluetooth via the Madoka. But haven’t got very far with that yet. (I know there’s a hardware option that can be wired into the P1P2 bus, as well as ESPAltherma.)
(I’ve bumped LWT a bit since house has got a bit cold.) Looks like defrosting cycles at 15:06 and 17:06 ?
Not sure why power dropped at 13:26 - perhaps just LWT overshoot? I need to increase overshoot so that it tolerates requested LWT dropping when outside temperature rises, for example.
Oh, no, looking at the more frequent power logs on my zappi logging, probably was also a defrost.
BTW I’m suspecting that perhaps the bypass valve might be allowing some hot water through, which means that the water returning to the heat pump is warmer than that coming back from the radiators. I think I’ll probably ask Octopus to visit at some point to check.
I couldn’t see which graphs you were looking at, but was the outside temp 0c? I note the behaviour you describe in the installer reference guide:
“In heating operation, the desired leaving water temperature is locally increased
around an outdoor temperature of 0°C.This compensation can be selected when
using an absolute or a weather dependent desired temperature (see illustration
below).”
ok it has now warmed up and the defrost cycles have stopped , but a other issue has showed its head, the hot water is not reaching the schedule set point this has happed twice today
i have now selected power mode to get the hot water up to temp if it will , if not i might have to turn up the flow rate restriction from the 60% to see if that makes a difference
any idea what has caused the hot water to stop early before the schedule ends or the water reaches target temp ?
the only recent changes i have made is removing the reheat mode
i have put back on reheat mode and reduced the hysterisis setting to 6 and reheat target temp is 42 , the comfort setting is 50 so the heat pump should be able to raise the temp from 36 to 50
“For simultaneous space and domestic hot water operation request.”
I guess its there so it can switch between heating and hot water to prevent the house cooling too much. Not sure how I feel about putting all that energy into raising the flow temp to abort, switch to space, then switch back to DHW.
I also found that if a defrost cycle happened to be running at the point the hot water schedule started, it wouldn’t immediate start hot water heating until the next half-hour, so a good three hours of schedule is needed I think, to make sure it happens at some point overnight.
seems like a odd situation again from daikin that if you set a schedule for two hours to get to 50 degrees , that there is then a seperate restriction in the installer settings of the mmi
The installer ref guide is good but unless you read it cover to cover and fully digest what it all means, how can anyone expected to know how their system will perform until it’s in and running.
It kinda feels like we, the customers, are documenting what actually happens here, in forums. I’ve certainly benefitted from the experience of others. It’s a complex beast for sure.
I had the same thought. Yet on another thread they’re talking about the benefit of heating the water in two separate time blocks, which I thought was interesting: Daikon Altherma 3, sub 2 DHW COP
with heating you have user defined 1, 2, 3 and off
but for hot water only user defined and off! Why on earth didn’t that do the same for DHW as they did for heating and give us 3 seperate schedules to swap between.
I did wonder if you could use HA to switch the hot water schedule (always on) on and off
Altherma DomesticHotWaterTank Schedule
options:
User defined
“off”
but if its only looking for the start of a hot water cycle in the schedule then that wouldn’t work if you enabled the schedule already part way through the hot water cycle. Not tested it though.
