Hi,
The house was built in 2006, and I was just reviewing the plumbing and noted the balancing valve was set completely wrongly at position 1 (it goes from 0-7). This means it is almost fully open and I have been wasting energy heating up the bypass loop all these years.
I understand that the way the valve is set is a factor of
1) The minimum flow rate of the boiler. I checked this and the Potterton Suprima series require a minimum flow of 9l/min or 2 imperial gallons/min
2) The pump. The pump is a 3 speed Sure Pump 65/130. I cannot find any reference to this pump anywhere on the internet and therefore I cannot find a graph to get the Head meters/feet figures. I found a roughly similar pump from Dab which suggests approx. 5.3 H m on speed 3 of the pump
3) I cannot find on the internet the graph for the UVC16/22. I found a similar one on Peglers website for part 678021 (22mm), and on that graph if I convert 5.3 H m to .52 bars and 9l/min to .54 metres cubed per hour, then on the chart, I am way way above the graph curves even if I set it to its maximum of 7...which implies to me no matter what I do I am heating the bypass loop.
At the moment I set it to 5 which is the point at which I can't audibly hear flow in the bypass loop when the heating is on, but can hear flow when the heating is off (although I don't have the equipment to prove its flowing at the minimum of 9l/min). But I can tell I am still heating up the bypass loop all the time because it's still getting hot without any pump over-run (i.e. it heats up before the electric heating valve closes)
I feel I am missing something here......any advice greatly appreciated.
The house was built in 2006, and I was just reviewing the plumbing and noted the balancing valve was set completely wrongly at position 1 (it goes from 0-7). This means it is almost fully open and I have been wasting energy heating up the bypass loop all these years.
I understand that the way the valve is set is a factor of
1) The minimum flow rate of the boiler. I checked this and the Potterton Suprima series require a minimum flow of 9l/min or 2 imperial gallons/min
2) The pump. The pump is a 3 speed Sure Pump 65/130. I cannot find any reference to this pump anywhere on the internet and therefore I cannot find a graph to get the Head meters/feet figures. I found a roughly similar pump from Dab which suggests approx. 5.3 H m on speed 3 of the pump
3) I cannot find on the internet the graph for the UVC16/22. I found a similar one on Peglers website for part 678021 (22mm), and on that graph if I convert 5.3 H m to .52 bars and 9l/min to .54 metres cubed per hour, then on the chart, I am way way above the graph curves even if I set it to its maximum of 7...which implies to me no matter what I do I am heating the bypass loop.
At the moment I set it to 5 which is the point at which I can't audibly hear flow in the bypass loop when the heating is on, but can hear flow when the heating is off (although I don't have the equipment to prove its flowing at the minimum of 9l/min). But I can tell I am still heating up the bypass loop all the time because it's still getting hot without any pump over-run (i.e. it heats up before the electric heating valve closes)
I feel I am missing something here......any advice greatly appreciated.
