(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 8 of 8

Thread: Bradford White Defender FVIR

  1. #1
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default Bradford White Defender FVIR



    for Atmospheric (conventionally)
    vented water heaters

    During normal operation, air for combustion is drawn into the water heater through the opening in the jacket. This air travels down and around the combustion chamber and enters through holes in the very bottom of the corrosion-resistant combustion chamber. The air then travels up through the oriented flame arrestor plate louvers, where the velocity of the air is increased and its direction altered. The air then mixes in a normal manner with the supplied gas and is efficiently combusted, producing very low NOx emissions. In the case where trace amounts of flammable vapors are present in the air flowing into the combustion chamber, the burner or pilot flame harmlessly ignites the vapors. If flammable vapors are in sufficient quantity to prevent normal combustion the burner and pilot flame is shut down. Should the flammable vapors continue to the burner, the flame arrestor plate prevents the flames from traveling backwards and igniting vapors outside of the combustion chamber. The calibrated, multipurpose thermal switch recognizes this and shuts down the pilot and main burner. This switch also deactivates the burner and pilot in the unlikely event of restricted airflow caused by severe lint, dust or oil accumulation on the arrestor plate.
    Bradford White web site

    http://www.bradfordwhite.com/defender.asp#

    Last edited by Terry; 04-24-2009 at 10:33 AM.

  2. #2
    Plumber Cass's Avatar
    Join Date
    Nov 2005
    Location
    Ohio
    Posts
    5,984

    Default

    It is fairly simple...the flame arrestor plate louvers act just like a mantel on a Coleman lamp where the gasses burn only on one side of it never passing through it...this is why the vapors never ignite the source of the vapors causing a fire...

    Thanks, Terry!!!

    Last edited by Terry; 04-24-2009 at 04:54 PM.

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,655

    Default mantles

    Another reason the mantles work is that combustion CANNOT occur unless there is oxygen/air present and the mantle flame keeps it out of the interior of the mantle. Popular Science has an article about the difference in combustion between a bubble filled with hydrogen and one filled with a hydrogen/oxygen mixture. The first one is a "pop" and the second a "BANG". The idea was to show the difference between a controlled flame in an LPG burner and an explosion of a house filled with propane.

    Last edited by Terry; 01-20-2010 at 12:48 PM.

  4. #4
    Master Plumber master plumber mark's Avatar
    Join Date
    Feb 2005
    Location
    indianapolis indiana - land of the free, home of the brave....
    Posts
    4,243
    Blog Entries
    1

    Talking Bradford White and Rheem

    The Bradford white and Rheem have the best
    FVIR systems available...

    About two years ago I did have to take a bradford White out due to a quirkey down draft in the chimmney that was putting out the piolit light..in the garage....
    I Had to install a Rheem and the problem went away...for good and it made me wonder
    about downdrafts in to these FVIR systems...


    I have been looking for a decent pic of a cross section of the Rheem FVIR, just to compare them.....cause it seemed to me at that time that the Rheems design held up better in that situation

    .http://images.google.com/imgres?imgu...US281%26sa%3DN


    I repaired a Whirlpool FVIR last week and noticed
    when the furnace came on and started to run that their
    was a slight back draft down through into the heat chamber..

    it made me wonder if wether part of their problem is any
    possibility of a back draft down into the heat chamber
    tripping the high limit fuse....
    with such a small air intake screen, if their is any back draft at all while the unit is burning, it would be like snuffing out a candle....or pushing down or warping the flame

    either way its still a piece of junk.....

  5. #5
    Illinois Licensed Plumber SewerRatz's Avatar
    Join Date
    Nov 2008
    Location
    Chicago, IL
    Posts
    1,705

    Default

    I ran into a water heater that had the issue of the pilot going out randomly. So of course first thing I did was change the thermal couple. While lighting the heater the furnace kicked on and the pilot went out while I was holding down the pilot bitten and I got hit with a face full of exhaust from the furnace. The home owner stated this problem just started a couple weeks ago. So I busted out my trusty sewer camera and shot it up the flu pipe into the chimney, and found a huge birds nest with a couple dead birds stuck in the chimney. Once I cleared the nest out problem was solved. Now when I run into pilot issues the first thing I do is light up a smoke capsule and fire up the furnace to make sure I am not getting any back draft.

  6. #6
    Senior Robin Hood Guy Ian Gills's Avatar
    Join Date
    Jul 2007
    Location
    USA
    Posts
    2,781

    Default

    I've got one of those and it's the second best bit of plumbing equipment in my house...

    Last edited by Terry; 04-24-2009 at 12:35 PM.

  7. #7
    Master Plumber Redwood's Avatar
    Join Date
    Dec 2007
    Location
    Connecticut
    Posts
    7,463

    Default

    Quote Originally Posted by Ian Gills View Post
    I've got one of those and it's the second best bit of plumbing equipment in my house...
    I think you are sadly mistaken...

  8. #8
    Senior Robin Hood Guy Ian Gills's Avatar
    Join Date
    Jul 2007
    Location
    USA
    Posts
    2,781

    Default

    Come on Redwood. We all know what the best bit of plumbing equipment in my house is. She sits upstairs, all white in her porcelain glory.

    Number 3 incidentally is the Redwood, outdoor faucet lawnmower bumper...

    Last edited by Ian Gills; 02-27-2009 at 11:20 AM.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •