I logged a support call directly with Diehl which went to their German helpdesk.
They punted it over to the UK support desk.
Who were going to get their local support technician to talk to me.
Only to change their mind and suggest I needed to report the issue to Stockshed!!
Agh what a nightmare. Is the meter manageable in its current state? Can you just avoid using higher flow rate? I run my system at 16 L/min, I didn’t notice any drop in performance when I reduced it down from 22 L/min. Assuming the flow rate is sufficient to deliver the required energy, running at a lower flow rate results in less pumping power required, therefore marginally higher COP.
On my Kamstrup heat meters, the default Meter-Bus IDs are the last 2 digits of the Serial Number. I notice the close-up of your meter (showing the E7 code) has 25 as the last 2 digits of the number below the barcode, so wondering if Diehl/Sharky follow the same convention. Does your friend’s meter have 59 as the last 2 digits there by any chance?
So we are now flat, with DN10 before and DN5 after as per the Sharky docs.
Guess what? It’s WORSE now than it was on the downward section.\
I’m all for giving up on this Sharky, I really am.
We had over 1000lph (16lpm) in heating mode yesterday, it was fine recorded with no issues.
But as soon as the hot water kicks in, even at just 700lph it craps out, errors and throws rubbish data to my emoncms and screwing up heat output data. It’s proper frustrating!!
My historical data is no ruined with a daily COP of 52.3!!!
Last thing I can see in the Sharky manual to try is…
We also urgently recommend installing the flow sensor in a tilted position (45°) in
order to remove possible air bubbles from the circuit.
After that, i’m out of suggestions apart from buy a Sontex?
I’ve heard nothing back from StockShed or Sharky themselves on this. That’s been poor too!!
I may be tempting fate but after much deliberation I’ve bought a 6m3/h (1" BSP thread) sharky 775.
Should be OK for the flow rates we’ll see with our HP (also checked with Stockshed) even though they are on the lower end of its rating. It also has really low pressure drop and matches the 28mm primaries.
Our system is being installed the week of the 20th so will report back on how it goes…!
Meanwhile it’s interesting that this larger unit does not have a tap for a temp sensor in the brass body - so you need 2 half inch tees one for each temp sensor…
The 1/2" sensor pockets that came with the Sharky don’t fit super well into the 28mm compression/1/2" tees I have - only about 1/3 of the thread screws in then the end of the pocket hits the other side of the fitting.
Is this an issue anyone else has seen? Not sure if a bit of PTFE is going to do the job here…
These tees came from Monsterplumb, maybe there are better ones that have a ‘deeper’ 1/2 inch port from a different manufacturer?