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GUARD DOG
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bob young
Member Posts: 2,177
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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Comments
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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.0 -
guard dog
world plumber, thanks for the input bro. much appreciated. bob0 -
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. bob0
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