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Navien NCB 250-150

marcelt66
marcelt66 Member Posts: 6
edited December 20 in THE MAIN WALL

Hi everyone do I need recirculating pump on heating return line to drop pressure

I have 9 Radiators same time the pressure go up to 36 PSI

I Have 1 Taco 007-F5 On supply line

Thanks

Comments

  • GGross
    GGross Member Posts: 1,322

    You need an expansion tank. Can you show a pic of the piping as installed?

    SuperTech
  • marcelt66
    marcelt66 Member Posts: 6
    IMG_2727.jpeg

  • marcelt66
    marcelt66 Member Posts: 6

    Thank you this it’s my setup

  • marcelt66
    marcelt66 Member Posts: 6
    edited December 23

    Hi I notice when the boilers runs for heat if I open hot water faucet pressure go up to 36 PSI and safety valve it,s opening making noise

    Thank you

  • neilc
    neilc Member Posts: 2,868

    what year is the Navien? maybe heat exchanger is leaking thru(?)

    known to beat dead horses
    SuperTech
  • marcelt66
    marcelt66 Member Posts: 6

    2023

  • pedmec
    pedmec Member Posts: 1,078

    Your missing a PRV and Backflow

  • GGross
    GGross Member Posts: 1,322

    Is that expansion tank piped to both the heating system and the DHW side but just valved off? what is the pressure on that expansion tank? it should say on the label somewhere the precharge, if someone changed it they would write it in sharpie or something. You also have a bunch of valves partially closed off for some reason?

  • marcelt66
    marcelt66 Member Posts: 6

    Expansion tank it’s like 15 Psi from 40 PS

    From tank it’s pipe to heating not to DHW

    Those partials closed valve I did to reduce pressure in

    Do I need to connect expansion tank to hot water supply to

    Thanks

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