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    Laars mini therm soot

    Elpisador
    Elpisador Member Posts: 1
    in Gas Heating
    I have a Laars mini therm jvs125boiler about 10 years old. Had to clean soot 3 times over the last winter. Unit cycles on-off after a few seconds of firing up. Sometimes I get a buzzing sound. Any help is greatly appreciated. Thanks in advance. 

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    Comments

    • Jamie Hall
      Jamie Hall Member Posts: 25,950
      Combustion is off. Get a competent tech. in there to thoroughly clean it, and with the proper test instruments and get everything set as it should be for best combustion. It is impossible to set a burner correctly by eye or by ear.
      Br. Jamie, osb
      Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
      kcoppSTEAM DOCTOR
    • hot_rod
      hot_rod Member Posts: 24,938
      Short cycling and low return water temperature are a couple causes of copper tube boilers sooting up.

      Things get worse as the fins plug up.

      Get a CO meter near that beast.
      Bob "hot rod" Rohr
      trainer for Caleffi NA
      Living the hydronic dream
    • EBEBRATT-Ed
      EBEBRATT-Ed Member Posts: 17,643
      Yes, HX probably plugged with soot.
    • HomerJSmith
      HomerJSmith Member Posts: 2,640
      How's your combustion air?

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