Chimney liner height and creosote issue

The Brit Posted By The Brit, Feb 5, 2019 at 10:36 AM

  1. The Brit

    The Brit
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    Dec 3, 2018
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    Can anyone please give their experience feedback here.

    Blaze King Ashford 30, installed brand new, running for three months now, elevation about 3000ft, chimney liner double wall going up a wood chimney chase to spec, floor to chimney liner top height 17 - 18ft, 1 elbow, 1 "T", 32" horizontal run, split wood moisture 15 - 19%, Kiln dried wood 8%, split wood also at 12%. Never mix the wood by experiment. I have tried placement of wood in NSEW directions, smaller loading, full loading.

    Have to always operate the stove at about 3/4 - 7/8 open otherwise the unit will cool off too quick. Get a lot of creosote on the glass and burning on high only removes the surface creosote. Keeping it on high will cook the house (1750sq.ft) upper level.

    Does anyone have an experienced opinion that increasing the flue height by even 3ft would give me a better draft, and therefore result in better damper control and perhaps less creosote on the glass. My guess is a little more draft will help to keep the glass cleaner to some extent.

    By the way, I inspected the flue and it is absolutely clean, NO creosote at all, only a light dusting of grey ash.

    Many thanks guys
    Andy
     
  2. bholler

    bholler
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    Creosote in the box and on the glass is perfectly normal with a cat stove shut it back more
     
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  3. maple1

    maple1
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    otherwise the unit will cool off too quick

    How are you determining that or what is your measure of that?
     
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  4. The Brit

    The Brit
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    If I shut it back more the fire will go out.
     
  5. The Brit

    The Brit
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    According to the manufacture's guide I should be at near to 25ft plus, which is ludicrous. The WETT standard is to measure from the floor level.
    All I get from the installer is that they have installed hundreds of these stoves and I have overly humid wood. NOT so! I have used wood as low as 5% and if I burn on high, then it will keep the creosote to a minimal level of course.
    The BIG issue is I CANNOT dial the cat down below about 3/4 otherwise the glass craps up again and the heat dies off. To me it seems inadequate draft, also indicated my some smoke coming out of the door.
    I don't know if this is helpful, but in the -25C weather for example, to get any heat output I have to run the unit at 7/8 open, which of course will go through wood very quickly.
     
  6. bholler

    bholler
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    Yes but will the cat still be active? Many times cat stoves will run with no active flames in the box. That is perfectly fine as long as the cat stays active it is working properly
     
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  7. bholler

    bholler
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    Also how are you measuring the moisture content of your wood?
     
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  8. maple1

    maple1
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    I wasn't sure from your post - how high is the top of your chimney from the top of the stove? I don't think the manual refers to measurements from the floor.
     
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  9. maple1

    maple1
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    (A pic of the install might help...)
     
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  10. John B

    John B
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    Go by cat temp not flame. Wood smoldering creates smoke which is what the cat burns. Often I have no flame in the box and 1000+ cat temps so i know she is cruising along just fine.
     
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  11. The Brit

    The Brit
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    To be sure, if I dial the cat down to about 1/2 - 5/8 setting the temp will drop and the cat will not be in the active zone. It is stated that I should be able to dial the cat right down and still be in the active zone.

    I am also wondering if the air intake is an issue. The 4" pipe comes in through straight then at the back of the stove it has a saddle bend before it enter the underside of the stove. This to be represents two 90 degree bends as it were. Is it possible that this is also restricting the draw of air couple with a potentially short flue height?
     
  12. The Brit

    The Brit
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    Your correct, the manual does not say measure from the floor, but the WETT standard apparently stipulates to measure from the floor. I think this only adds conflict to the calculations of flue height; what is truly necessary for a good draw.
    My height from stove top to chimney top is about 14' 4". Too bloody short if you ask me. And remember I am at 3000 ft elevation.
     
  13. The Brit

    The Brit
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    Wow, the only way I can get a 1000 degrees is to run it at fully open all the time, which will cook the house because the wood is really burning fearsly with flames.
     
  14. bholler

    bholler
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    I am not sure where it states you will be able to turn it all the way down but that is not nessecarily true. Also if the fan is on it will make the cat probe read low
     
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  15. The Brit

    The Brit
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    Hope these photos help. Note the air intake pipe has a saddle bend in it, not just one elbow.

    20181222_124136.jpg IMG_5532.JPG IMG_5533.JPG
     
  16. The Brit

    The Brit
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    The owner's manual mentions it. I also chatted with Blaze King and they said I should be able to dial it all the way back. Also I do not have a fan installed on the unit.
    I appreciate your feedback.......this is a pain in the butt my friend.
     
  17. bholler

    bholler
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    Well I can tell you I can't turn my princess all the way back and from talking to people here most can't unless they are running 25' + chimneys.

    And it's a cat stove if you run it shut back the glass won't stay clean.
     
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  18. maple1

    maple1
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    The copy of the manual I found on line said minimum 15' from top of stove to chimney cap, in the spec section on page 5. That's before adding the extra required for elbows, horizontal sections etc..

    So ya - you are quite likely too short.
     
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  19. The Brit

    The Brit
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    I am using a recommended 4 prong perpetrator meter probe. Measuring split wood from both ends of split and in the middle as recommended.
     
  20. The Brit

    The Brit
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    Hi again, that's exactly what I think too. Yes in reality I need a 25 foot run. It's funny the renowned installer will not make any comment on that and INSISTS I am to blame..........hmmmm. Where is one to go from here when you have complied to ALL of there demands?
     
  21. bholler

    bholler
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    By both ends do you mean end grain or face near the end. Also is the face freshly split?
     
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  22. The Brit

    The Brit
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    Thanks man, that's what I feel. The installer is FINALLY coming out here today to do a full test. It will be interesting to see what he has to say. I will keep you all posted.
    Big thanks.
     

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