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High Limit Stat tripping

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Comments

  • #122
    John.G
    Registered Users Posts: 3,466 ✭✭✭John.G


    THE ALM wrote: »
    Think so jimf
    THE ALM wrote: »
    Actually thinking about this a bit more and the Delta T for the HW would be dependant on the temp of the water in the cylinder at the time would it not?

    If the water already in the tank is close to that passing through it then there is going to be little of no transfer of heat and the return temp is going to be only marginally lower than the flow temp. A more accurate Delta T reading would be from running it when the cylinder is at a much lower temp.

    At the moment I measure the temp of the cyclinder through a smartthings sensor so I must measure the temp of water coming from a tap to see how accurate this sensor is and adjust accordingly.
    It's the deltaT across the boiler that I am interested in, this is only dependant on two items, the boiler output and the flowrate, it doesn't matter what the heat load is. The heat load determines the boiler run time.


  • #123
    jc500
    Registered Users Posts: 11 ✭jc500


    Would have thought control stat should operate before limit stat. Solid fuel furnace boilers have issues with too much oxygen in combustion and too much heat causing limit stat on fan to trip. Excessive heat in water jacket after pump stops. Maybe just water pump fault.


  • #124
    jimf
    Registered Users Posts: 3,946 ✭✭✭jimf


    jc500 wrote: »
    Would have thought control stat should operate before limit stat. Solid fuel furnace boilers have issues with too much oxygen in combustion and too much heat causing limit stat on fan to trip. Excessive heat in water jacket after pump stops. Maybe just water pump fault.

    as a rule control stat will operate before limit stat

    but if control goes faulty and doesn't trip at set temp then limit stat should lock boiler to safe mode


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