Hmm, mine changed just fine.
Mine changed over fine.
Check out User Settings > Time/Date on the MMI, there’s a Daylight Savings option in there.
Ah, that must be it.
I thought it very odd not to do it as its internet connected, knows the date, day time etc.
Update: scroll down and down and there it is👍
Thanks
Yep, mine is on DST so no idea why it didn’t update.
I’ve just seen a firmware update notification appear in Onecta - maybe they’ve fixed this…!
First days for us of not having any HP heating on at all during the day/night since the mid January install.
Will be interesting to see what the ECO DHW COP climbs to as the weather gets even warmer.
I am still having issues with my Daikin Altherma 3 8kw. So I am looking to see if I can pull some information together to help resolve it. So all of you with the Altherma 3 8kw or 6kw, PLEASE HELP.
So to outline the issue briefly. I run my ASHP in full weather dependent mode, with only one zone, ie the whole house . During the winter the default setting is 45c flow temp at -1.2c, with 25c at 16c . I have the default delta T of 10c as per the Daikin recommendation, but also because anything else would make the problem worse.
So at the coldest times my Heatpump should be able to output 7.8kw of heat according to the Daikin specification. However it does not, it is limited to 4.88kw. This is the limit placed on it by the settings in heating mode. The output is driven by the delta T and the flow rate. My flow rate when it’s running in settled mode,( ie has been running for a while ), is ~7lpm, actually it jumps around between 6.9lpm and 7.1lpm, but that’s all. When heating domestic hot water it’s fine and obviously is running off a different algorithm or instruction and can go as high as 24lpm.
My contention is that my Altherma is no different from anyone else’s Altherma and therefore this should be a problem for all Altherma’s unless they are somehow being operated differently. The only difference I have been made aware of is the homely app, apparently according to one user , the homely is able to vary the flow rate in heating mode and thus increase output. I have looked at a lot of the charts on the openenergymonitor site and what I see there seems to substantiate two things, firstly that resting flow rate does seem to be around the 7lpm for most altherma’s and secondly that I don’t see, or haven’t spotted any one getting over the 4.88kw.
So what I am hoping to get from people is that either they too have hit this limit or that they haven’t. Now if they haven’t I would like to understand the conditions that let their Altherma get above the 4.88kw of output. Clearly if they too have hit this limit what impact has it had for them on trying to reach temperature. From my experience the problem only matters with the temp below about 10c after 10c, the 4.88kw is enough .
Would appreciate your input. Thanks.
If there’s a history here then I’ve not read it, so apologies, but if you want more heat output why don’t you increase the flow temperature to 50c or higher at lower outside temperatures?
To be honest I’ve not seen another 8kW or lower Daikin system on OEM that needs such high output at 10c to maintain temperature.
Edit: and from what I understand, lowering the DT will increase the heat production as you desire, as you’ll get an increased pump speed in order to hit it.
I appreciate that you’ve had a look at other 8kW systems and flow rates, but have you checked their implicit dT - the HPM.org data doesn’t collect dT values I believe.
I’m surprised your dT is set as high as 10. My 9kW dT is 5, using FanCoil setting, which is what Octopus set it to. Are you using Underfloor, Fancoil or Radiator? Radiator is limited to dT 10-12C, others can be 3-12C.
The delta t is not controllable. The recommended setting for radiators is 10. However if you lower the dT then you reduce the Heatpump output, which is the opposite of what I need. However the critical issue for me, is whether other Altherma 8kw owners are getting more out of theirs. Interestingly I was just going through the spec for the altherma 8kw and it says the minimum flow rate for heating is 12 lpm, which I hadn’t spotted before. But clearly that is not the case, but if it was, my hp would have no difficulty hitting the 7.8kw output.
Ben
Hi, no lowering dT lowers heat pump output. And I Don’t need 7.8kw at 10c, but I do at -1.2 etc, and given the current situation it can only deliver 4.88kw. But again I am trying to gather input on whether other users are getting more out of theirs at the low temperature, because if they are then I need to understand why mine is performing differently. Interestingly I did just note from the altherma 3 8kw spec that heating min lpm is supposedly 12lpm, but that is clearly not the case. Possibly a typo in their book, but if it was 12lpm, then I would easily achieve the max claimed output, but it isn’t.
@John , John, the answers I am seeking really are as basic as understanding if anyone is getting more than 4.88kw of output out of their Daikin Altherma 8kw. I’m not, there is a physics constraint on it producing more. The only thing that would help it produce more is if the flow rate increased. But there is no control over the flow rate.
Why don’t you increase your flow temperature beyond 45c at lower outside temperatures if you want higher heat output?
You can’t say you’ve hit a physical limit in how much heat the heat pump is capable of outputting if you’ve limited it to 45c.
Looking at the 6-8kW installation manual, the Field Setting 9-0D Pump Limitation can be used to limit the pump speed in either heating or sampling modes:
0 - No limitation
1-4 - 90%-60% all modes
5-8 - 90%-60% in sampling mode
Is it worth checking this setting? Just a thought, especially as you say you’d expect a higher number from the manual.
@John , well that’s set another rabbit running. I found 9d and the rest, but it’s not for pump limitation and I’ve gone through as many settings as possible and can’t find the pump limitation setting. I did an internet query and it suggested 9.e for single zone pump limitation, but it wasn’t there either. A puzzle.
@Begall , Ben, the issue isn’t about trying to squeeze more heat it’s about the heat pump performing to its specification. If it’s only delivering max 4.88 kw it’s not delivering its specified output . No tweaking the LWT or anything else will change the output and ultimately that is what determines how much heat you can get. It’s a bit like buying a car that’s supposed to do 70mph , but it can only manage 50 and saying well go down a hill it’ll speed up.
Hi
I have a Daikin 8kw unit installed jan this year, straight after installation before I adjusted the pump to the house for the first couple of days we had some really cold snaps ,
When temp was between -6.8 to 4.9 On first day and -5.2 to 1.6 on second day
I had max input of 3993w and a heat output of 10095w
Flow rate for heating always sets down to 6.9 to 7.1 after the initial high flow
Octopus had the weather curve set to 50 degrees at -2.5 if I remember
correctly
Have you check if quiet mode is on or if any max power setting have been set ?
After adjusting by weather curve to 37 @ -7
On a cold day -2.5 to 8 degrees I had a max input of 2060w with a heat output of 7574w
@markr , Mark, just so I understand, I’m assuming the figures you are quoting are daily usage and daily heat output, would that be correct? Also were you running 24/7?
As a reference what numbers are you getting on our DHW ?
I have my system set to heat to 48 degrees at the moment with quite mode on and heating at midnight I have a max electric input of 2kw and a max heat output of 7kw
@markr , mark could you send me a link to your Heatpump on open energy monitor, so I can have a look. I can’t tell what the lines refer to from the screenshots. But this looks interesting. Thanks