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GUARD DOG

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bob young
bob young Member Posts: 2,177
in THE MAIN WALL
Anyone ever run into problems with including a guard dog low water cutoff in a low voltage circuit on a commercial hot water  gas fired system.  weil-mclain lgb   twin gas valves, twin spark paks , single pilot burner, twin flame sensors. aquastat wired to maintain water temperature.      boiler shuts down & fails to fire 30 % of the time.  please advise.   any ideas, timmy !!   bob

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  • World Plumber
    World Plumber Member Posts: 389
    test peroid

    If I remember right the Guard Dog Shuts down and looks for water then comes back on after a internal clock goes threw it's cycle. At least that is how they worked when they came out. A lot of service calls to find they system was doing as designed. Took a lot of them off to make customers happy. You might consider a different LWCO read the spec before you install it.
  • bob young
    bob young Member Posts: 2,177
    guard dog

    world plumber, thanks for the input bro.  much appreciated.  bob
  • bob young
    bob young Member Posts: 2,177
    spark ignition / guard dog

    one more detail, when call for ignition, pilot lites with right hand sensor but left hand secondary sensor fails to ignite & unit shuts down. tried replacing ignition wire to secondary sensor & that worked but one day later started malfunctioning again.  maybe bad secondary spark pak ?  its always something. bob
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