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Gas regulator

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JohnJay1
JohnJay1 Member Posts: 12
in Gas Heating
We have a Navien 110NCB where the Ignitor keeps gumming up and failing. Navien won't warranty the parts because they say the gas regulator has to be 10' away from the boiler. It is currently 7' away. They say that the gas supply is not sufficient. It piped 7' from the high pressure gas manifold where a regulator is installed at the manifold. It is piped in 1/2" from the manifold.

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  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,844
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    Can you describe the "gumming up" in a little more detail? Would you say that it is a substance from the gas source that is soft and mushy, or would it be more like a crust as would happen if there were other chemicals in the atmosphere joining the combustion process? Perhaps if you post a photo of the ignitor... that might help

    Also Did you find my wiring diagram and aquastat location helpful on your last post https://forum.heatinghelp.com/discussion/192580/superhot-boiler-issues#latest?
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • JohnJay1
    JohnJay1 Member Posts: 12
    edited June 2023
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    Sorry
  • JohnJay1
    JohnJay1 Member Posts: 12
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    Maybe gumming up is incorrect. Was thinking of another job. This one is this:

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,844
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    The shorter electrodes close together are for the 6000 volt spark.  One of them is a chassis ground. The other longer electrode is for the flame signal.  Electric current travels through the flame to chassis ground. That linger electrode needs to be polished clean with emery cloth or steel wool 
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • hot_rod
    hot_rod Member Posts: 22,157
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    Looks like CSST feeding that unit? Is it sized properly?
    Has a combustion analyzer been used to dial in the burner? It doesn’t look like it has been seeing clean combustion.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    GGross
  • GGross
    GGross Member Posts: 1,049
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    Rather than keep changing igniters, fix the issue. You have a combustion issue, the manufacturer has advised your gas line does not meet spec. Start there, provide enough gas piping at an appropriate size to allow enough volume of gas for proper ignition and combustion, check combustion make it right, stop changing igniters

    for reference, it doesn't matter if your gas sizing table says you can get enough BTU/hr from a short gas line, modern equipment also needs a sufficient volume of gas at ignition, This means a "too short" gas line can and often times is a real problem
    bburdMad Dog_2

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