ok guy's
I've solved part of the puzzle, but not sure why... although I go back to the "standpipe theory"
After the gas guy's came to change the water tank, I decided to checked out, clean replace the
rusted out drain cover. GUESS WHAT I FOUND
so in the drain hole, was water as you'd expect, say about 6" from the top, didn't smell looked cleanish,
now THOES 2 pipes run directly into there, I proved this buy connecting a funnel to the pipes and poured water in and it tricled into the drain, INSIDE the drain is def one pipe, but appears to have been sealed with a "concrete" type affair
So the primer from the sink run's into there , WHICH I understand why, and 2 transparent hoses (over the top of the grate), from the HVAC, which occasionally has a water run off.
From the drain, you can draw 2 straight lines to the 2 pipes.
now what they do... HMMM
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