Grundfos Ups15-58fc speed switching guts

Teemok

A while ago (2021) I was working on an air handler project and wanted to be able to switch my pump speed with a relay as part of a two stage air handler heating system. I was trying to keep the boiler in the fully condensing mode by slowing flow in the coil to get a high delta T. This is what I found inside a scrap 15-58 pump I had on hand. Yes, I tested it and the relay switching worked well. I know that most won't care and would never need to such info. Someone might find it useful at some point. NO, I don't think the 26-99 is the same. Obviously, use at your own risk.

HomerJSmith

I appreciate it.