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When Cast iron should and should not sweat
I have a new 250K Weil Mclain CGa in this ancient gravity conversion house, with three inch mains and the lot. Many big radiators. The previous was a 270k input Janitrol. Scary gas works, w/non-safety pilot.
Heat loss proves sizing is correct, and the system comes up with time. However, I am nervous about flue gas condensation in the boiler due to prolonged cold return water.
I have a bypass between the supply and return, though its only one inch. Should bypass' be as large as the header/manifold size?
I had originally considered piping this thing with primary/secondary like a mod/con, but changed my mind when I weighed cost/time parameters. I kind of wish I had now. W/M manual has an option for p/s piping arrangement, but strangely they also show a bypass below the closely spaced tees. That threw me off.
I now have a 0010 pushing the load, but I think I'll slow it down w/ a 007.
Anyone every install p/s piping on a standard, high mass setup? Would this help with avoiding flue gas condensation, since its more like injection?
I do see evidence of a small amount of moisture being produced, and the boiler has only been installed for a month.