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Let me try this again, this time with a 1" supply pipe. Surely that will cause trouble!

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  • mattmia2
    mattmia2 Member Posts: 15,598
    https://forum.heatinghelp.com/discussion/comment/1879352#Comment_1879352

    it isn't that the steam going through the trap equalizes the return, if steam were in the return after the air was out of the emitters and the pressure in the mains and returns was equal the system would perform just fine. the condensing steam in the emitters would pull more steam in to the emitter and it would heat just fine.

    The problem with steam in the returns of a 2 pipe system is that it closes various traps from the return side before air has finished venting out of them from the mains in the crossover traps or main vents and from the emitters in the radiator traps as well as closing the vents on the return keeping the air from venting from the return.

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