Alpha 2 15-60-130 pump

[Drak911]

Hi we have a Alpha 2 15-60-130 central heating pump fitted. We need a bit more heat from 12 rads. I’m confused about the settings as the Auto Adapt was pulling 14w which is not enough. I have now set the right side led to position 4 and it pulls 25w.

Does anyone know what the pump should run at for 12 rads and does it matter which setting is used - left or right led settings. Images attached.

 

[John.g]

25 watt is indicative of more or less what I would expect as sufficient for 12 rads, that setting is constant pressure CP3 which is a 12ft or 3.7M constant head which should be fine IMO, the right hand photo is showing it in constant speed CS 2 which only gives a max head of 7.8ft or 2.4M which falls still further as the flow demand increases, reflected in the 14 watt output, far too low IMO, the highest setting is CS3 at 19ft or 5.8M which shouldn't be required for your system. Auto Adapt (proportional pressure, PP control) doesn't really work on most pumps.