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Variable flow injection pumping boiler overhaul...Need advice!
I've been reading a lot about boiler protection and primary secondary piping configurations and I want to try converting my boiler to a variable flow injection pumping setup. I currently have three zones, the main house is on a reverse return Venturi tee split loop with 1-1/4" supply and two 1" returns. Cast iron baseboards. Second zone is a 1" indirect. Third zone is going to be a 3/4" reverse return cast iron radiatiors zone.
I'm planning on a 1/-1/4" boiler and secondary loop due to the size of the Venturi tee loop. I'm wondering about the split loop. Just add another tee to the secondary loop, right? Also I'm wondering what the best size pipe for the crossover bridge would be. I plan on using a B+G autocirc on the boiler loop, a VT2218 as the injection pump and an Alpha 2 on the secondary loop. I've got 90% of the materials needed to do this but I need to reread primary secondary pumping made easy again first