Boiler pump placement on parallel P/S two-boiler system

Rocky_2 · August 2006

Can I place the boiler pumps on a parallel primary/secondary system on the individual boiler returns? Usually I put them on the supply outlet, but I am using two Buderus SB615-640 Mod/Con's and the centerline of the outlet is already about 65" high. By the time I get a Grundfos 50/240 pump and B&G 4" Triple Duty valve and a 4" ball valve all stacked vertically on each other, I will be almost above the ceiling. Am wondering if I can put the pump and triple valve on the boiler returns instead? What say Ye?
Warm regards from soon to be chilly Fairbanks.
Rocky

PS. I installed a Buderus 515-12 with a Riello RL50 last week. That is one SWEET system! 1.8 million BTU's running so quiet I can whisper sweet nothings to my honey on my crappy cell phone standing right next to the burner. Second identical boiler and burner goes into the system next week.

Paul Rohrs_4 · August 2006

Sure

This is the only way I pipe multiple mod/cons. I like pumps on the boiler inlet to overcome the pressure drop of the HX, but equally as important, I like flow checks on the supply, but lately I have been using circulators with integral flow-checks.

Hope this helps.

Regards,

PR

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Boiler pump placement on parallel P/S two-boiler system

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