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Burnham PVG 5A Not firing

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lincopc
lincopc Member Posts: 2
in Gas Heating
Hello All;
We have a Boiler that sporadically will not fire up to keep the boiler at temp. It seems to happen when the
House temp and Hot water needs are Stable for a long period of time Boiler temp goes to Zero.
If it calls for heat or hot water the boiler will fire normally and will work normally for many cycles.
Any Ideas. changed Hi limit switch , check all connections Differential switch to function correctly (ran required test) Boiler is spotless.

Any on have an Idea.

Thanks
ken

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  • jimct
    jimct Member Posts: 10
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    That is perfectly normal operation for high efficiency boilers. They are termed cold start and only run when there is a demand for heat.
  • lincopc
    lincopc Member Posts: 2
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    Ah but, the cold contraction causes a New air vent leakage. Never been an issue before
  • Jamie Hall
    Jamie Hall Member Posts: 23,287
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    lincopc said:

    Ah but, the cold contraction causes a New air vent leakage. Never been an issue before

    Say what? Are you saying that when the boiler cools down the pressure drops low enough to suck in air? Shouldn't do that -- what's the expansion tank doing?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Canucker

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