As per the title! I have asked for a fixed flow rate of 37c at a delta t of 5c. Why doesn’t it just do it? I’m struggling with this, it is so inconsistent, some days it is really good and then things happen, DHW is OK then terrible, heating after DHW seems to go wrong, it doesn’t seem to get up t…

I don’t think so John. The BUH equipped models need the LWT temperature sensor at R2T after the BUH as if the BUH is in use the LWT will be higher than it is coming out of the heat exchanger at R1T. R2T measures the temperature of the water leaving the heat pump. R1T measures the water temperatur…

Two points: I think we’re all agreed that R2T is the most sensible place to monitor outbound flow temp for BUH-equipped systems - no need to discuss that further What the HP/MMI should use and what they actually use for various values from the sensors are quite different things; I might be barking…

Hi John, As far as I can see the MMI and the app report the value at R2T as LWT, do you agree? The value of R1T is reported in the MMI and I see a value, like Stephen, that is about 1c higher than that reported at R2T, there is a reported temperature loss, whether that is true or not I don’t know …

LWT @ MMI/App = R2T, yup. Various R1T/R2T differences reported, attributable to a) heat loss b) thermistor calibration/performance variation - agreed. I’m interested in finding out why mine seems so much greater than e.g Stephen’s; that extra 1.2C I experience constantly makes all the differenc…

Hi John, I will keep it updated as you would expect :slight_smile: But if we get R2T close to R1T you won’t see greater heat output, this is what I am trying to get across, what you will see is reduced electricity consumption, possibly anyway. It is a subtle difference. I would not expect any ins…

[image] matt-drummer: I really need to set my monitoring up like yours and Stephens, I am sure we would all like to know what differences there are between the data direct from the heat pump and from a heat meter. @matt-drummer et voila: [image] Daikin Altherma, ESPAltherma &…

[image] matt-drummer: I f you look at Stephen’s picture with the covers off you will see some insulation on some pipework, whether Octopus added that or it comes like that, I don’t know. I don’t know if mine has it, I wonder whether yours does, maybe that would explain the difference you are see…

I really need to set my monitoring up like yours and Stephens, I am sure we would all like to know what differences there are between the data direct from the heat pump and from a heat meter. I’m sure we’d all really appreciate that! Thanks in advance… My only interest is in getting accurate dat…

Hi John, i am an accountant, I understand that they will want to save money, they did this by building one heat pump and turning it down to make three `smaller’ ones! However, they have fitted some insulation and for only a tiny extra cost they could have insulated the whole lot and get much bette…

This behaviour is not what I expected from a heat pump. I really want to be able to run the heat pump for shorter periods but stuff like this stops me doing it. I don’t think this is how a heat pump should behave. It was working fine from 13.57 to 18.08 when I turned down the flow from 36c to 35c w…

I am lost and confused with my Daikin heat pump

Hardware Heatpump

Stephen_Crown (Stephen Crown) 15 December 2023 14:32 17

@matt-drummer et voila: