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Gas boiler Operating.

2»

Comments

  • #52
    Micky Dolenz
    Registered Users, Registered Users 2 Posts: 44,080 ✭✭✭✭Micky Dolenz


    gary71 wrote: »
    Don't go mixing up a real ignition or combustion issue with a made up over firing issue.


    I mean, if co2 readings are out or gas rate too high or low.


  • #53
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Here are some facts:

    1) The higher the C.V the more a supplier can charge:eek:(so ours is high because?)

    2) A gas boiler shall be gas rated on commissioning.

    3) you can only commission asper the manufactures instructions and none allow for the adjustment of the gas isolation valve

    5) you can't adjust the gas rate on a condensing boiler other than the adjustment allowed by the manufactures on some gas valves to set correct co2. adjusting the gas inlet valve may put the working pressure at the appliance below the required amount specified in IS813 5.4.5.

    6) The manufactures write different instructions for different countries so the values can change in the manuals although the boilers stay pretty much the same.

    7) To date in this country no gas boiler made by my firm has had a issue with the high CV given by Bord Gais.

    8) When designing and making appliances, manufactures use the European average calorific value which is 10.8 kWh/m3 as a starting point and not the UK CV value.


  • #54
    Joey the lips
    Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    gary71 wrote: »
    Here are some facts:

    1) The higher the C.V the more a supplier can charge:eek:(so ours is high because?)

    2) A gas boiler shall be gas rated on commissioning.

    3) you can only commission asper the manufactures instructions and none allow for the adjustment of the gas isolation valve

    5) you can't adjust the gas rate on a condensing boiler other than the adjustment allowed by the manufactures on some gas valves to set correct co2. adjusting the gas inlet valve may put the working pressure at the appliance below the required amount specified in IS813 5.4.5.

    6) The manufactures write different instructions for different countries so the values can change in the manuals although the boilers stay pretty much the same.

    7) To date in this country no gas boiler made by my firm has had a issue with the high CV given by Bord Gais.

    8) When designing and making appliances, manufactures use the European average calorific value which is 10.8 kWh/m3 and not the UK CV value.


    This is why i orig closed the thread. No 3 was my understanding...

    ps... you forgot 4.


  • #55
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Joey the lips wrote: »
    This is why i orig closed the thread. No 3 was my understanding...

    ps... you forgot 4.

    Fact number 4) I'm sh1t with numbers:o


  • #56
    JohnnieK
    Registered Users, Registered Users 2 Posts: 2,526 ✭✭✭JohnnieK


    Joey the lips wrote: »
    Hi Folks...

    Wondered if you can help. Was asked a question today i have not been asked in a while... Brother has a gas boiler thats 15 years old and sounds like its just about to set down...A couple of leaks...heatexchanger pump... etc...

    Anyway traditionally what i would have done there is supply a boiler with a cast iron heat exchanger somethine like a suprima or a glowworm. You know why..the dirt etc...

    Just wondering since condensing boilers have come in the standard seems to be aluminium heat exchangers which off course is prone to blocking...or are they...


    The simple question i am asking is...what is now supplied for the retrofitting of a boiler...is it a condensing one with a fabricated heat exhanger and a serious system flush or is it something else...

    Many thanks for parting with the knowledge....

    A stainless steel heat exchanger is the only way to go Joey. The best corrosion resistance, and minimizes deposit build up due to having a smooth surface.


  • #57
    Joey the lips
    Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    JohnnieK wrote: »
    A stainless steel heat exchanger is the only way to go Joey. The best corrosion resistance, and minimizes deposit build up due to having a smooth surface.

    I like that but are they interchangable.. For example if i buy a make of boiler can i go off and buy a stainless steel heat exchanger.


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