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Discuss Grundfos Alpha 2 AutoAdapt is slow in the Central Heating Forum area at PlumbersForums.net

Hi folks be glad of some help with this as its puzzling me.🤔

I have an Alpha 2 15-60-130 pump serving 12 Rads with thermo valves and Hot Water cylinder. The boiler is an Alpha CD18R

Since I had another rad installed downstairs I've noticed the heating pump has been noisier than usual ie running at full bore... annoying when it comes on during the early hours to start the days heating.

The engineer had left it set to III which runs at 45W. It gets the job done but at the cost of the noise. Problem is I dont know what the setting was before. When I put it onto autoadapt the rate drops down to 9W which seems way to slow to get all the rads piping hot. I've found the best compromise is to use the other Proportional Pressure setting on full which provides around 35W and is ok noise wise, but still feels excessive and not very energy efficient

Since it has an autoadapt feature i'd like that to be working for me but it just doesnt seem to give it enough pressure.

So two questions

Anything else I could be checking for?

What power wattage would you expect to see for my system?
 
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