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Contact breaker sizing for boiler

Discussion in 'Electronic Design' started by Andrew Edge, Feb 13, 2007.

  1. Andrew Edge

    Andrew Edge Guest

    Hi.
    Can anyone help me to know
    what the typical Electric Power consumption is for a gas boiler having
    a maximum heat output of 120000KCal/h.

    Andy
     
  2. john jardine

    john jardine Guest

    The "convert" prog' makes those kCal/hour into a whopping 140kW of heat.
    Which implies a small industrial unit.
    About 250W for the circulating pump (if any) , solenoids and the monitor
    electronics.
    I'm assuming UK (cos you don't say 'furnace') so that's about 1A, so a 2Amp
    fuse should be OK.
     
  3. Andrew Edge

    Andrew Edge Guest


    Thanks for the reply John.
    We need a circuit breaker for the boiler so I'll go for one with 10
    Amp and groundfault protection .As the wires are at least 1.5mm^2
    they should stand that current without melting.

    Andy
     
  4. Anything from zero on up. Why does it need an electrical supply?



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  5. Andrew Edge

    Andrew Edge Guest

    It is for Industry. Some I can remember are Ignition, fans, Pumps,
    Zone and gas valves, switchboard and programming unit, keep hot and
    preheat heaters, standby power.

    Andy
     
  6. You need to add all of those up (worst case) and calculate the correct size.



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