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  1. #1
    Join Date
    Oct 2005
    Location
    los angeles calif
    Posts
    41

    RBI dominator boiler trouble

    model#bd1050 RBI having trouble with it starting, due to air balance I believe, everything is set correctly, but it seems to blow itself out after flame proof on ignition, main burners come on and it blows out sounds like foo foo foo and retry. even the barametric vent damper slams and rocks back and forth. inlet filter is clean, but when I remove the access door it fires right up beautifully.

  2. #2
    Join Date
    Apr 2005
    Posts
    516
    is the vent cap on?
    Jason J Saylor
    Pinellas County Schools
    HVAC Tech/Part Time HVAC Instructor Fortis College
    Pinellas County Florida

    "You will encounter many distractions and many temptations to put your goals aside: The security of a job, a wife who wants kids, Whatever. But if you hang in there, always following your vision, I have no doubt you will succeed.
    Larry Flynt quote

  3. #3
    Join Date
    Oct 2005
    Location
    los angeles calif
    Posts
    41
    IS THE VENT CAP ON, HUH? ONCE AGAIN THE NAVY IS NO HELP AT ALL. LOL

  4. #4
    Join Date
    Mar 2001
    Posts
    1,213
    So what happens when you remove the access door? - Does it draw air, or do you have backpressure @ the door? What is your fuel?

  5. #5
    Join Date
    Jun 2008
    Location
    Windsor, Ont.
    Posts
    516
    Assuming that you have the differential air pressure set right, I'd be taking a close look at the heat exchanger to see if it's plugged up and causing excessive back pressure. I've seen a number of these style boilers with fouled heat exchangers that have destroyed the burners as well.

  6. #6
    Join Date
    Apr 2005
    Posts
    516
    Navy?.....at a air force base?.....funny. anyway it was Keep it simple question. i have seen boiler do the same thing, because it had either improper vent cap or no vent cap. and you said damper slams back and forth, was legit question....
    Jason J Saylor
    Pinellas County Schools
    HVAC Tech/Part Time HVAC Instructor Fortis College
    Pinellas County Florida

    "You will encounter many distractions and many temptations to put your goals aside: The security of a job, a wife who wants kids, Whatever. But if you hang in there, always following your vision, I have no doubt you will succeed.
    Larry Flynt quote

  7. #7
    Join Date
    Oct 2005
    Location
    los angeles calif
    Posts
    41
    lol sorry saylor240 I couldnt resist, anyway ya, thats what I'm thinking a pluged up heat exchanger, low fire air pressure delta is .68 set by installers and high fire is 1.0"wc but now I'm getting a low air fault. plus a failed or fauls start, like a flame blow out. and like I said in the last post, when I remove the upper access panel it starts and runs perfectly. I relly dont want to remove the heat exchanger just to clean it. thanks everyone.

  8. #8
    Join Date
    Apr 2005
    Posts
    516
    NO Problem man, yes my last name is saylor and work for the air force, one time i had on a badge that said my name Saylor, and a guy walks up to me while were out smoking and says " navy guy huh" funny, anyway. cause your saying that when you remove that upper access i am still leaning towards a flue issue. i have seen a nest in a flue cause all kinds of little headaches and quirks.
    Jason J Saylor
    Pinellas County Schools
    HVAC Tech/Part Time HVAC Instructor Fortis College
    Pinellas County Florida

    "You will encounter many distractions and many temptations to put your goals aside: The security of a job, a wife who wants kids, Whatever. But if you hang in there, always following your vision, I have no doubt you will succeed.
    Larry Flynt quote

  9. #9
    Join Date
    Oct 2005
    Location
    los angeles calif
    Posts
    41
    I've had the flue off to inspect it, its completely clean no build up and know obstruction. and for moose when I remove the door it draws air in.

  10. #10
    Join Date
    Apr 2005
    Posts
    516
    Got this off there website, seeing how you checked every thing else looks like its the pressure switch setting or failed pressure switch, you could try and jump it out and see if it stays on. its probably n/o switch so let it kick on then jump it.


    Gas Flow Shuts Off During Low air (blocked flue/inlet) • If condition exists,check inlet,
    Operation (Blowers Remain On) condition flue, chimney for blockage
    • Check combustion air/ventilation
    openings in space
    • Check inlet air filter, clean/replace
    as necessary
    • Check pressure switch for correct
    setting
    Jason J Saylor
    Pinellas County Schools
    HVAC Tech/Part Time HVAC Instructor Fortis College
    Pinellas County Florida

    "You will encounter many distractions and many temptations to put your goals aside: The security of a job, a wife who wants kids, Whatever. But if you hang in there, always following your vision, I have no doubt you will succeed.
    Larry Flynt quote

  11. #11
    Join Date
    Oct 2005
    Location
    los angeles calif
    Posts
    41
    this might be a late response, but yes. it was both the right and left low fire pressure switches.

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