Grundfos Alpha Pump

[sysint]

Sort of restricted on this site so I have to put this here...
On this DP variable pump how does the piping look for mixed zones?
Currently I've got radiant on a modulating three-way valve and a reverse return radiators.

With the new boiler it's decoupled and the Supply House said go with the variable DP pump but what I think I can get away with piping doesn't look right...

EDIT-- the second drawing with the multiple pumps is "right" to me.

[viessmann]

i would go with drawing on the right

[viessmann]

but we usually pipe dhw tank after decoupler

[sysint]

The DHW is in the future--- However, are you aware this is a Variable Speed pump with internal differential pressure control?

[freddy-b]

Neither one is optimum.

[freddy-b]

The first one the wild rads will make the pump control impossible for the rest of the loop. Why not just Tee the rad returns back with the floors zones return and call it good?

[sysint]

This is how I did it (originally from the old boiler) --- The difference is the baseboard was R/R. I could see making the baseboard pump the Alpha with R/R and ZV's on all the radiators doing whatever.