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New Navien NCB-240 without Heating loop temporarily

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cybersurfr
cybersurfr Member Posts: 11
edited March 2022 in THE MAIN WALL
Hello All,

I have a need to run a combi-boiler temporarily without space heating. Just due to time factors. (we have a furnace, so space heating is a second priority). Navien sent this to me and it seems simple enough, but I am looking for some commentary from those who maybe have done this before. In creating the primary loop this way.

Would someone be as kind to explain the highlighted components?


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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,549
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    S is heating system supply from boiler

    R is heating system return to boiler

    Your heating loop (the 6" Min & 12" Max) has a supply valve, return valve, a purge valve an expansion tank and an air separator.

    H domestic hot water out of the boiler

    G is gas supply to boiler

    C cold water into boiler for domestic hot water

    The other two pipes are city water make up for the boiler loop & condensate drain

    This should all be in the manual

    Are you trying to install this your self??
  • cybersurfr
    cybersurfr Member Posts: 11
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    I will not be installing it myself, my plumber will. However I have had horrid luck with plumbers doing all mannerisms of things. So I am trying to establish what to look for to ensure the Job was done 100% correctly.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,549
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    @cybersurfr

    I would download the manual for the boiler to be installed and make sure the plumber follows the piping diagram among other things.

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