Very interesting Tony.
Apart from the noise, I see that the pump is (I'm fairly sure) in Auto Adapt mode, while this shouldn't cause noisy operation, I have never seen a Grundfos pump up to now running even remotely at a fairly sensible power output, most pump (Auto Adapt) nothing at ~ 9W.
However, the main problem is that its impossible to calculate the pump head and flowrate from this but in your first photo of the pump, below, it shows it running in constant pressure mode 1, CP1, which is a constant pressure of 3M and, from the pump curves, gives a flowrate of 10.0LPM, pretty normal IMO, the mystery is why is the pump running in CP mode when on CH duty and Auto Adapt mode in HW duty, as far as I know these modes are only selectable manually with the setting button.
So, if, just now on CH duty only, press and hold that setting button, the LEDs should then start highlighting in sequence from III,II,I (on the left of AutoAdapt) and then to the right, when the third LED (like below) on the right is highlighted, release the setting button, the pump will now be in CP1 mode which at 3M should certainly not be the cause of any pump over/air ingress. (I run mine at the equivalent of 3.6M which flows 12LPM).
The setting button is on the very bottom, >
When HW is next requested/required then the pump should stay in CP1 mode and the flow rate can then be calculated from the power output.
If its running just now on the CH you might just post another photo of the Pump+LEDs.
If I am not reading the LED properly in the video and it is running in CP1 mode then the power falls to 14W to give a flowrate of only 3.0LPM, definitely air in the system.
EDIT: Looking at that video again then yes, I think it is running in CP1 mode (third LED on the right) so no need to reset it.
You might also check that bypass valve in the attachment, these valves take ~ 3 to 4 full turns of the handwheel to fully open or shut, it may be partially or fully open so try turning it clockwise first and count the number of full turns to shut it, if its fully shut it will take 3 or 4 turns to fully open it, if so, shut it again and leave it shut.
Apart from the noise, I see that the pump is (I'm fairly sure) in Auto Adapt mode, while this shouldn't cause noisy operation, I have never seen a Grundfos pump up to now running even remotely at a fairly sensible power output, most pump (Auto Adapt) nothing at ~ 9W.
However, the main problem is that its impossible to calculate the pump head and flowrate from this but in your first photo of the pump, below, it shows it running in constant pressure mode 1, CP1, which is a constant pressure of 3M and, from the pump curves, gives a flowrate of 10.0LPM, pretty normal IMO, the mystery is why is the pump running in CP mode when on CH duty and Auto Adapt mode in HW duty, as far as I know these modes are only selectable manually with the setting button.
So, if, just now on CH duty only, press and hold that setting button, the LEDs should then start highlighting in sequence from III,II,I (on the left of AutoAdapt) and then to the right, when the third LED (like below) on the right is highlighted, release the setting button, the pump will now be in CP1 mode which at 3M should certainly not be the cause of any pump over/air ingress. (I run mine at the equivalent of 3.6M which flows 12LPM).
The setting button is on the very bottom, >
When HW is next requested/required then the pump should stay in CP1 mode and the flow rate can then be calculated from the power output.
If its running just now on the CH you might just post another photo of the Pump+LEDs.
If I am not reading the LED properly in the video and it is running in CP1 mode then the power falls to 14W to give a flowrate of only 3.0LPM, definitely air in the system.
EDIT: Looking at that video again then yes, I think it is running in CP1 mode (third LED on the right) so no need to reset it.
You might also check that bypass valve in the attachment, these valves take ~ 3 to 4 full turns of the handwheel to fully open or shut, it may be partially or fully open so try turning it clockwise first and count the number of full turns to shut it, if its fully shut it will take 3 or 4 turns to fully open it, if so, shut it again and leave it shut.
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