Smooky
In the Trades
So, how do you control speed on a recirculating pump? Voltage control (ie. variac), or pulse-width-modulation or current limiting. Is this even possible? Isn't it a simple ac motor? I have Grundfos pumps, some 3 speed others 1 speed.
Instead of changing the speed you could add a valve to reduce the flow. What problem are you having that you need to do that?