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Advice on 2-Pipe Primary/Secondary
I am trying to set up a System for a church- using 2-pipe P/S piping with direct return and cross-over pipes
The only reason I can type those words is because I have been reading them in Dan H.'s book--Primary Secondary Pumping Made Easy.
We have done a lot of 1-pipe P/S but not the 2-pipe method.
My question has to do with sizing the primary piping.
Since the Boilers are in the basement, and (2) of the (8) zones will be connected on the basement level, would I stay out of trouble if I reduced the size of the Primary downstream of the first 2 zones, before sending the rest of the Primary up to the Mezzanine level, then upsizing again after the return gets back to the boiler room?--Or should the primary piping remain the same size for the whole length?
Thanks to anyone who may want to comment.