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Draft Control flap slams when Buderus oil boiler shuts off

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cckriss
cckriss Member Posts: 29
https://streamable.com/byhl4r
Here is a video of what happens.

The Buderus boiler was installed a few years ago, this never happened. A couple of months ago, i had the exhaust liner replaced.

What is happening? It’s so loud.

Comments

  • HVACNUT
    HVACNUT Member Posts: 5,841
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    What size liner was installed?
    What model Buderus? The G115 has a 5 inch flue while the G215 uses 6 inch.
    It's not abnormal for the regulator to move when the burner shuts off, but I don't see it budge during the run. A draft test must be done, and the regulator adjusted. With either the G115 or G215, Buderus specs 0 to slightly positive draft over fire, and -.02 breach. Smoke and combustion tests should be done as well. Has it been serviced since the installation?
    Big Ed_4
  • cckriss
    cckriss Member Posts: 29
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    HVACNUT said:
    What size liner was installed?
    What model Buderus? The G115 has a 5 inch flue while the G215 uses 6 inch.
    It's not abnormal for the regulator to move when the burner shuts off, but I don't see it budge during the run. A draft test must be done, and the regulator adjusted. With either the G115 or G215, Buderus specs 0 to slightly positive draft over fire, and -.02 breach. Smoke and combustion tests should be done as well. Has it been serviced since the installation?
    It is G115 with 5”. Before the liner, it was -.05 as measured by the boiler installers. An energy auditor measured it at -.01 and said it was not enough and i should call a chimney company. The chimney company said the original flue tiles had alot of yellow deposits and it should be re-lined. I dont know what they measured.

    I used to occasionally smell very very slight diesel fumes near the boiler when it first starts up. After re-lining, i no longer smell anything.

    The boiler has been serviced once, before re-lining.
  • HVACNUT
    HVACNUT Member Posts: 5,841
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    cckriss said:
    HVACNUT said:
    What size liner was installed?
    What model Buderus? The G115 has a 5 inch flue while the G215 uses 6 inch.
    It's not abnormal for the regulator to move when the burner shuts off, but I don't see it budge during the run. A draft test must be done, and the regulator adjusted. With either the G115 or G215, Buderus specs 0 to slightly positive draft over fire, and -.02 breach. Smoke and combustion tests should be done as well. Has it been serviced since the installation?
    It is G115 with 5”. Before the liner, it was -.05 as measured by the boiler installers. An energy auditor measured it at -.01 and said it was not enough and i should call a chimney company. The chimney company said the original flue tiles had alot of yellow deposits and it should be re-lined. I dont know what they measured.

    I used to occasionally smell very very slight diesel fumes near the boiler when it first starts up. After re-lining, i no longer smell anything.

    The boiler has been serviced once, before re-lining.
    Have it tested again. Combustion, smoke, draft.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,533
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    When the burner shuts off the flame collapses and causes the draft to change instantly. This is common. If the burner does not have a post purge perhaps that can be added it would quiet the shutdown
  • cckriss
    cckriss Member Posts: 29
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    When the burner shuts off the flame collapses and causes the draft to change instantly. This is common. If the burner does not have a post purge perhaps that can be added it would quiet the shutdown

    Is this something I can DIY? If not, do I call a plumber? HVAC guy? Chimney guy?

    Thanks
  • HVACNUT
    HVACNUT Member Posts: 5,841
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    cckriss said:
    When the burner shuts off the flame collapses and causes the draft to change instantly. This is common. If the burner does not have a post purge perhaps that can be added it would quiet the shutdown
    Is this something I can DIY? If not, do I call a plumber? HVAC guy? Chimney guy? Thanks
    You call an oil burner tech.
    What burner? A Beckett or Carlin needs to have a primary capable of post purge. If it's a Riello, it needs a post purge timer module. 
  • cckriss
    cckriss Member Posts: 29
    edited April 10
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    It's a Buderus G115. Oh I believe it's a Reillo 40.
    HVACNUT said:


    cckriss said:

    When the burner shuts off the flame collapses and causes the draft to change instantly. This is common. If the burner does not have a post purge perhaps that can be added it would quiet the shutdown

    Is this something I can DIY? If not, do I call a plumber? HVAC guy? Chimney guy?

    Thanks

    You call an oil burner tech.
    What burner? A Beckett or Carlin needs to have a primary capable of post purge. If it's a Riello, it needs a post purge timer module. 

  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
    edited April 11
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    Sounds correct to me with your Buderus and a perfect sized liner ..

    There was an error rendering this rich post.

  • cckriss
    cckriss Member Posts: 29
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    Big Ed_4 said:

    Sounds correct to me with your Buderus and a perfect sized liner ..

    It's really loud. I can hear it from the 2nd floor.
  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
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    Your Buderus can be fired direct vent . It serves no purpose on your boiler but it is code... A missed placed screw could lock it in ....

    There was an error rendering this rich post.

    GrallertEdTheHeaterManSuperTech
  • HVACNUT
    HVACNUT Member Posts: 5,841
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    Big Ed_4 said:
    Your Buderus can be fired direct vent . It serves no purpose on your boiler but it is code... A missed placed screw could lock it in ....
    What serves no purpose, the draft regulator? If draft is greater than -.02 at the breech, how do you "regulate" that?
    And direct venting would require a balanced flue with the BF Riello, not the F3 or F5 40 Series.
    EdTheHeaterManDJD775SuperTech
  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
    edited April 13
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    You are right , ...The banging of the damper , the static pressure is high or location on damper

    There was an error rendering this rich post.