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Plumbing condensate return through an F&T trap
We replaced the 80 year old steam boiler in our condominium with a one. In the boiler room, the contractor connected the old condensate line, two steam lines (the terminal ends), an F&T trap, a vented feed water system and the boiler like this:
Condensate Line -> Steam Return -> Steam Return -> F&T trap -> Vented Feed Water-> Boiler
It seems to me that the condensate line will be at atmospheric pressure so long as there is no steam or condensate in the F&T trap. But, when steam arrives at the F&T trap, the door to the atmosphere closes, radiators stop taking steam, and steam from the terminal runs will want to flow up the condensate line.
The contractor says some radiator steam traps may have failed. Seems like bad plumbing to me.
Am I missing something?