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Slapping draft regulator on burner start

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Robert_H
Robert_H Member Posts: 251
in THE MAIN WALL

I recently serviced a Crown KSZ150 steamer that the draft regulator slaps right after the burner lights.

This boiler is very clean and new looking.

The DR is only about 12" above the breech and there is a 90 right above it due to supply main interference. then 16" horizonal and another 90 and then about 3 feet to the chimney.

I think I should move the regulator to the middle of the run to the chimney as I have seen recommended in posts on this subject here on HH. Field Controls guide says "locate the control as close as possible to the furnace or boiler" maybe I should "as close as possible" with consideration to this…

Also when I showed up the regulator weight was missing, probably vibrated off. my current remedy for this is to carry washers, 10-24 carriage bolts, wing nuts and lock tight.

The fire looks and sounds good otherwise, Ca:

draft OF -.1 Breech -.3-.5ish
at 0 Smoke - 1%

Tstack 485

02 5.1

CO 53

CO2 11.88

AT 56

Thanks for the help!

Robert

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,605

    The draft reg is going to swing when the burner lights. How much is the question?

    If the burner is lighting smooth, then I wouldn't have an issue moving the draft regulator farther from the boiler may help. Putting it after the two 90s if you can. The 2 90s may take some of the slap out.

    Robert_H
  • Robert_H
    Robert_H Member Posts: 251

    I went back today to discuss this with the homeowner and make the change and having moved a shelf on one side of the chimney found a nice, intact 8" Type RC regulator on the chimney. I temporarily taped off the pipe regulator and was able to adjust draft correctly with the chimney unit. A piece of 7" pipe to replace the T and things are sweet!

    Ill take an easy one. And the lesson that I need to be better at looking the chimney of on a new to me system.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,605

    Glad it is fixed. Chimney mounted barometric used to be very common. As long as it controls the draft your good to go.

  • Robert_H
    Robert_H Member Posts: 251
    https://forum.heatinghelp.com/discussion/comment/1873683#Comment_1873683

    Right and from what I've experienced, they last longer because they don't get knocked about every time the pipe is cleaned.

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