- Nov 22, 2008
If they are placed in series you increase pressure - not flow rate. The volumetric flow rate must be constant - if its not you will starve the latter pump - and could wear out the bearing.
Ideally both pumps need to run at same speed, and have same flow rate.
He can only benefit from 2 pumps with variable speeds in parallel config. i.e. 2 pumps separately connected to rez, then pumps connected to the loop with a single T junction connection to the rest of the system.
Thanks for repeating what I have been writing?
And yer wrong, you can run either D5 or DDC variable or not in series or parallel. And stop with different pumps and crap may cause damage BS. These are not geared pumps.