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  1. JSS00

    Navien NPE240-A2 NaviCirc Confusion

    Okay, that’s what I was leaning towards. Do you know what purpose a check valve on the main serves?
  2. JSS00

    Navien NPE240-A2 NaviCirc Confusion

    Sorry I think there’s some misunderstanding. I do know about the difference in piping and internal and external recirc. I have installed NPE-A systems where you pipe the cold into the return with a tee and a check valve on the cold side to prevent looping. With the new A2 systems it appears...
  3. JSS00

    Navien NPE240-A2 NaviCirc Confusion

    For whatever reason, Navien has conflicting information all over the place regarding the proper installation of the comfortflow/navicirc system. Do I still need to hook up the cold to the recirc port with a check valve above the tee if I am using an A2? The technical drawing from the NPE-A2...
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