Advertisement
Help Keep Boards Alive. Support us by going ad free today. See here: https://subscriptions.boards.ie/.
If we do not hit our goal we will be forced to close the site.

Current status: https://keepboardsalive.com/

Annual subs are best for most impact. If you are still undecided on going Ad Free - you can also donate using the Paypal Donate option. All contribution helps. Thank you.
https://www.boards.ie/group/1878-subscribers-forum

Private Group for paid up members of Boards.ie. Join the club.

Incorrect burner head?

2»

Comments

  • #32
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    The new Evo is snazzy. No purge unless you are going into FGA. It goes straight into gas seeking, pressure, etc. I haven't upgraded yet but am changing my probe to the Evo one for my V2. Changing my case for the the Evo one too.


  • #33
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    shane0007 wrote: »
    There are 2 important pressure readings with combustion, namely static head pressure & combustion resistance pressure. The latter is the resistance of the combustion chamber from routes, baffles, flue, etc. it is measured in mbars. Usually circa 2mbar but it may vary from boiler to boiler.
    The static head pressure is the pressure behind the blast tube fins to the back of the blast tube. This pressure is used to hold the flame in front of the fins. Adjusting the fin position will increase or decrease the static head pressure, lifting or bringing back the flame to the nozzle face. This pressure is usually about 4 - 6 mbar. When testing the two pressure must be added to be set as the total pressure must overcome the resistance path to flue terminal.

    Next time you are on a commercial boiler, you should see a test port on the combustion chamber door & one on the burner head. Along with MI's you can adjust the SHP to suit the installation, then adjust the CO2 to suit.

    A sign of incorrect settings is slightly blackened fins but a fairly clean chamber. Most domestic boilers SHP's cannot be adjusted. Many CI boilers can though as the resistance with those plays are larger role.

    Put the monometer on two burners today, servicing an 50/90 utitily with bf and got 1mbar.

    The other a commission wf k120 with a t5 short tube and got 5mbar, funny enough with this one as I decreased the air pressure it fell from 6mbar to the final position of 5.

    Is there any reading on static resistance pressure as I haven't come across it. Also no mention in mi.s as far as I read.


  • #34
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    You will generally just get the air damper setting in relation to nozzle output. The greater the nozzle, the greater the head setting.the smaller nozzle/power output requiring a lot less static head pressure to keep the flame in the correct position.
    Smaller domestic combustion pressures will be upto 1mbar. Larger non-domestic around 2mbar.

    Once you play around with them in conjunction with a FGA, you will see more of their affect & importance.


  • #35
    Froststop
    Registered Users, Registered Users 2 Posts: 445 ✭✭Froststop


    This might help: pages 6, 10, & 13 charts.

    http://nakco.com/Heating_Tip/Nozzle%20Knowledge.pdf


  • #36
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    Very useful document but nothing in it for combustion & static head pressures. Just all to do with nozzle selection & nozzle calculations, patterns & fuel flow rates. Danfoss do a similar document.


  • Advertisement
Advertisement