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Gonna be replacing this system and I have installed 3 way mixing valves but never a 4 way. Im trying to figure out this layout. Is it fair to say the supply and return is the primary and the other side of the mixing would be secondary? also it looks to be the radiant pump is returning into the mixing valve.Diagrams ive looked up show that the top should be the output.
I want to move my system pump on the supply and also with the radiant as well.