I have had an ecodan installed and am getting the installers to put in emonHP bundle monitoring equipment. They still have to come back and install the electric meters but they have the heat meter already installed. Our first proper DHW cycle was recorded by this but I am confused by the output (b…

Thanks Glyn, I think it may have been air or pressure related. I bleed the system when the 3 port was back to heating and increased the pressure back to 2. This was the DHW cycle last night. [image] I’ll keep an eye on it but looks like it is working.

Additional information that may or may not be useful… My wife says she heard creaking and cracking noises like our radiators and pipes were warming up at around roughly 03:30. This would match up with the end of the DWH cycle so I assume when the hot water was up to temperature the 3 port valve was…

It looks like the heat meter not correctly measuring the flow. There can be a number of things which can cause this: Low system pressure, try increasing to 2 bar Air in the system Sub optimal heat meter installation location The heat meter should be installed on a straight pipe run away from sour…

Great! That looks much better, out of interest what was the pressure? Over the coming weeks keep bleeding the system to try and make sure all the air has been purged.

This is my latest DHW run from last night (still waiting for electric meters to be installed): [image] Are spikes normal when the output has dropped in the later stages of the cycle? Feels like there may be some air trapped in the system but not sure why this would only happen at the lower output…

I’ve been watching our DHW runs since I had the electricity meter installed about 1 1/2 weeks ago. My readings mostly make sense but I’m still a little confused by a few things. Here is a DHW run from this morning: [image] I realise that the strangeness at the start is when the pump starts runn…

[image] ajdunlop: The next most immediately obvious thing is that towards the end of the cycle things get a bit more spikey with the flow rate and related to this the power output. It looks like he pump stops a few times as zero flow is read and one huge spike upwards. Any idea what might be goi…

See below for a photo. Sorry for the mess, haven’t tidied up the wires yet. [IMG_1277] According to the instructions it looks like it could be too close to the 90 degree bend before it on the return. There is a Tee directly after it as well for the bypass. The bypass looks to be set to 2 bar as i…

What could change about the flow once it gets up to the higher temperatures that would change things as it all looks good up to that point?

Sounds similar to things I experienced with my Sharky meter, ie it only started to foul up during mid to latter parts of hot water runs. https://community.openenergymonitor.org/t/sharky-775-heat-meter-questions/ Lots of detailed replies in that thread about what happens when water gets hotter with…

That all sounds very similar. The fact that it seems to happen at around 50 degrees on a DHW cycle. But what I still don’t get is why is there a corresponding change in the behaviour of the data going from 1 minute steps to every 10 sec spikes? I’ve run the system at 50 degrees and manually set th…

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New emonHP install with strange readings

Hardware Heatpump