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Is there any way to do this properly?
I have inherited a problem system. Lost a bid to a low bidder now they want me to fix their install.
Two condensing boilers (oversized) 550kbtu each.
It’s a water source heat pump system. So the closed loop operates at 70 degrees. Sounds like a great application for condensing boilers. But then there is a single large make-up air coil that requires higher temperature water during the winter.
The boilers have to be installed primary/secondary to the water source loop. But then there’s the high temp make up air coil.
Old boilers were non-condensing, primary secondary with 3-way tempering valve for return temp. Make up air was piped secondary to the primary loop with it’s own 3-way valve control by discharge air temp (70 degrees). It didn’t work well before. Now it’s way worse.
I can’t think of any proper ways of piping this.
Never stop learning.