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  1. #1
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    Williams wall furnace. Flames rolling out

    Hello guys. I got a newly installed Williams wall furnace. Nothing buy a headache from get go. Delayed ignition on startup BOOM pilot was out of position wasn't lighting immediately. Repositioned pilot. Then we had a high CO 1500+. I called Williams, no help. GV starts off low fire then 10 secs later kicks in to high, in high my manifold pressure is 3.5-4", and the flames rollout a real good amount in startup. I adjusted the manifold pressure today, don't remember what I lowered it too (idiot) I forgot and didn't take a pic of it n case I forgot. Anyways the CO is under 50 ppm now. furnace got inspected to today its a county program. Before I left I didn't see any flames rollout or very very little in startup. Well they inspected and she said they saw flames rollout for good 30 seconds. I'm not sure bout all that. 2 things. Is under 50 ppm ideal? And Williams told me I'm gonna have flames rollout briefly on start up. Is that correct? Besides looking at my manifold pressure tomorrow and remembering it what can should I be looking for on the flame rollout on startup? The draft is good. Anything I can do? I can lower my gas pressure all I want but why am I having to adjust this? Wasn't 3.5" ideal but I had a really high CO. Do I adjust gas pressure lower to help with flame rollout? Help please

  2. #2
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    How is it vented?
    “Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery.”

  3. #3
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    Thread Starter
    Oval to 4" round straight up about 10-15' sticks out of roof 2' about

  4. #4
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    Where are you measuring 50ppm at?

  5. #5
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    Thread Starter
    In the flue

  6. #6
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    Jun 2017
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    Quote Originally Posted by Iceman_pdx View Post
    In the flue
    50 seems high for a new furnace, but in reality anything under 100 in the flue is ok.

    As to the rollout, are you sure you don’t have a negative pressure situation? Exhaust fan running in the bathroom etc

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  8. #7
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    Quote Originally Posted by Iceman_pdx View Post
    The draft is good.
    How are you proving this ?

    As previously noted, draft pressure (measured with a gauge) should be tested with other exhaust fans and appliances running. Even opening and closing door can affect this.

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  10. #8
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    I suspect your problem is with a neg. draft, the venting or has inadequate combustion air for the space its in...or a combination of some of these.
    “Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery.”

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  12. #9
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    "Williams told me I'm gonna have flames rollout briefly on start up"

    They stated that this is "Normal"?
    Hos 4:6 My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you, that you may be no priest to me. Because you have forgotten your God’s law, I will also forget your children.


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  13. #10
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    I'm detecting a draft problem here. I know the newer williams furnaces all have a temp switch in front of the draft hood so if there's a negative pressure the switch should turn the furnace off. I hope the OP didn't disable that. On a natural vent a 4 inch pipe is rated at at about 45000 btus. The OP hasn't disclosed the model of the unit so I'm not sure if he's running a larger burner that what the pipe can handle.

    The best I can tell you is that Willams is a good brand and I've installed many without any problems at all. Of course I follow the code book closely. If your having problems it's time to take a closer look at your own work and not blame Williams.

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  15. #11
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    It was 39 ppm. I forgot I took a pic of meter. Other question. What should my PPM be on a new furnace vs old furnace. What should I be shooting for? Im going back out there, I'll see if anything else is running, and open a window or door and see what happens. Heck when county inspector was there, could had something running but not while I was there. Thanks for the 101 guys

  16. #12
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    Quote Originally Posted by Iceman_pdx View Post
    What should my PPM be on a new furnace vs old furnace. What should I be shooting for?
    There is no “New” verses “Old” standard.

    As long as the CO is below 100ppm and STABLE, it should be good.

    O2 in the 6-9% range is also what you should shoot for if you want the best efficiency.

    Flue temp on a natural draft furnace should be in the 415 - 525ºf range.

    Draft should be -0.01 to -0.02"wc minimum. Any decrease in draft when other appliances are turned on, needs to be addressed.
    Instead of learning the tricks of the trade, learn the trade.

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