Thank you Johntheo5.
Yes, I have also been thinking in terms of scaled waterways in the HEx, rather than really clogged up. Once one thinks in those terms, and recognising that the supposed flow temperature sensor is not fitted on or inside the actual flow pipe as it leaves the HEx, but seems to be fitted into the metal of the HEx nearby, one can at last begin to understand how this large discrepancy between sensed and actual flow temperature could arise.
It has struck me all along that the sensed HEx temperature and the sensed 'flow temperature' are always virtually the same, hardly ever differing by more that 0.5 to 1C. It's like they are both sensing the same thing - ie HEx temperature. We do have hard water here (used to fill the heating system) and use an ion-exchange softener for our other water. The system has Sentinel protector in it.
Just to reiterate, I have cross checked and calibrated my IR thermometer to the nth degree and am confident it is telling me the truth about my measured temperatures (always with black tape on any bare metal).
I did not note down the return temperatures during those tests but recall that it was only about 4C below my measured flow temperature during the 100% one (but the ABV flow would be affecting it).
The exact match between what GeddyMortgage described about his similar Greenstar 8000 system boiler and what I am experiencing is uncanny and I read his posts almost open-mouthed!
Let’s get my ABV sorted and then reassess ……. but I suspect WB will be coming back.
Yes, I have also been thinking in terms of scaled waterways in the HEx, rather than really clogged up. Once one thinks in those terms, and recognising that the supposed flow temperature sensor is not fitted on or inside the actual flow pipe as it leaves the HEx, but seems to be fitted into the metal of the HEx nearby, one can at last begin to understand how this large discrepancy between sensed and actual flow temperature could arise.
It has struck me all along that the sensed HEx temperature and the sensed 'flow temperature' are always virtually the same, hardly ever differing by more that 0.5 to 1C. It's like they are both sensing the same thing - ie HEx temperature. We do have hard water here (used to fill the heating system) and use an ion-exchange softener for our other water. The system has Sentinel protector in it.
Just to reiterate, I have cross checked and calibrated my IR thermometer to the nth degree and am confident it is telling me the truth about my measured temperatures (always with black tape on any bare metal).
I did not note down the return temperatures during those tests but recall that it was only about 4C below my measured flow temperature during the 100% one (but the ABV flow would be affecting it).
The exact match between what GeddyMortgage described about his similar Greenstar 8000 system boiler and what I am experiencing is uncanny and I read his posts almost open-mouthed!
Let’s get my ABV sorted and then reassess ……. but I suspect WB will be coming back.
