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Vaillant Oil Boiler

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gpjazz
gpjazz Member Posts: 35
in THE MAIN WALL

Hi all.. I'm having trouble finding information ( manual and parts list ) on an older Vaillant oil fired boiler.. Model # F70-W-45PP serial# 330-4951

I got called to this boiler because of a "no heat" and found several issues. 1st was all the soot all around the boiler on the floor. Tried to fire up to see what happens and no spark. Had a bad ignition transformer. So I ordered new transformer ( Beckett AFII burner), and returned with old clothing and allowed myself time to tear it all apart and completely clean it.

I got it all cleaned pretty thoroughly and then realized that there is no combustion chamber liner inside…No target wall. Naturally this seems odd to me. But I can't find any info online.

Is there supposed to be something in there ???

Any advice is appreciated.

Comments

  • HVACNUT
    HVACNUT Member Posts: 7,172

    No target wall or kaowool blanket. Its a positive pressure boiler. Make sure its tight.

    GrallertIronmanHydronicMike
  • Ironman
    Ironman Member Posts: 7,824

    They’ve been out of business in the US for several years now.

    The block was probably made by Buderus and like HVACNUT said, no target wall or blanket.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,279

    If there is no evidence of the old one I wouldn't be concerned. Some boilers have them and some do not. Don't know about the Valliant.

    I suppose you could search Lynn Products for that boiler If they don't list one it probably didn't have one.

    More important how was the combustion when you finished?

  • gpjazz
    gpjazz Member Posts: 35

    Combustion was ok, but not as good as I prefer. I believe there may still be a little soot in the passages that I just couldn't get to well enough affecting my numbers. Started out with CO at around 260, and I noticed stack temp was at 590. So I figured might still be some soot in there. Then I changed to a smaller nozzle and things got better.

    It was getting better and better as I let it run,, and after I cycled it off then on again several times. Probably had it running about an hour or so all together while checking and adjusting.

    Bottom line for now, best I could get CO was down to 67. This was with O2 at 6.5% and no smoke, and stack temp around 480. If I cut the air back, CO started to climb, so that's no bueno. Stack draft was also high at around .07 - .08 in the flue with barometric wide open. The chimney was really sucking.. lol. Might need to add another barometric to control draft. I plan to go back in a couple days to re-check combustion and go from there.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,279

    @gpjazz

    They like the CO under 50 but under 100 is safe to run. Maybe the soot will burn off and it will be better when you go back. Did you find any reason why it was sooting?

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