Honeywell ABV setting

[decomplexity]

Grundfos's note (attached) on their newish Alpha2 pumps and ABVs in CP and PP modes is worth a look. The parting comment there (for PP mode) is that "If an automatic bypass valve must be used, then a manual fixed bypass valve should be installed in series with the automatic bypass valve. The fixed manual bypass will restrict the flow as the automatic bypass valve opens."

 

[John.g]

Grundfos's note (attached) on their newish Alpha2 pumps and ABVs in CP and PP modes is worth a look. The parting comment there (for PP mode) is that "If an automatic bypass valve must be used, then a manual fixed bypass valve should be installed in series with the automatic bypass valve. The fixed manual bypass will restrict the flow as the automatic bypass valve opens."

I don't see any advantage in having a ABV+fixed bypass over a fixed bypass alone. See my post #10.
The wondervalve may improve this again, it will be interesting when/if they reply to your email.

 

[decomplexity]

Agreed - I found their argument a bit strange. It appears that the only circumstance where a differential pressure driven ABV would be effective is where the pump has a monotonically decreasing head from zero flow onwards. And none of Grundfos's domestic pumps have this as far as I know.

 

[Riley]

There for limiting water flow eg cold and hot

Won’t be any good on heating and will short circuit as always open

Or just completely ignore you