I have two Harman pellet stoves, a P38, & a P43. Both, at times, operate with a lazy flame. I have read articles, about air flow control, with a damper, or air flow control rod. Usually the type or manufacturer of the stove is not mentioned. Can any one shed light on how to correct lazy flame, in a Harman stove ?
Harman,damper / air flow
- Thread starter park4019
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alternativeheat
Minister of Fire
Well, the clue here is your comment "at times" it has a lazy flame. Are these "times" when it needs cleaning,or the pot needs scraping etc. You also can take a meter reading of your outlet voltage when the stove is running normally, then again when it has this lazy flame and notice the difference in voltage if any. If it is not a varying voltage then that sort of eliminates a low voltage situation affecting the combustion blower speed. Also, if you had a mechanical failure like door gaskets the flame would be lazy but it probably wouldn't be intermittent.
When my P61 exhibits a lazy flame , it's usually a good indication that I need to clean out the ash under the burn pot or I need to do a better job at scraping off the burn pot or else do it more frequently. Sometimes brushing out the vent can perk things up but I keep a time reference as to when that should be approaching.
When my P61 exhibits a lazy flame , it's usually a good indication that I need to clean out the ash under the burn pot or I need to do a better job at scraping off the burn pot or else do it more frequently. Sometimes brushing out the vent can perk things up but I keep a time reference as to when that should be approaching.
Bioburner
Moderator
Other manufactures use a slide in the exhuast but liittle to no speed control of the exhaust fan. Also most manufactures don't have a exhaust temp probe that helps control the feed rate.
Have you ever tested the amount of vacuum when the stove is running at the test port on the bottom left side of the fire chamber? There is a adjustment for draft fan on the board. Pretty limited in my experience.
Have you ever tested the amount of vacuum when the stove is running at the test port on the bottom left side of the fire chamber? There is a adjustment for draft fan on the board. Pretty limited in my experience.
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The last lazy flame burn, happened shortly after I had given it a pretty thorough cleaning prior to season start up. The one thing I didn't check was condition of door gaskets, with a piece of paper. Also, haven't checked line voltage. Thanks for the suggestions, will give it another cleaning, check voltage, & door gaskets. Both stoves are well over 19 years old. Love my Harman's
park4019
Can a automotive type vacuum gauge be used to test operating vacuum , or do I need a magnehelic gauge ? Thanks for the suggestions !
park4019
Bioburner
Moderator
A piece of clear silicone tubing, a bit of colored water and a ruler will do. Examples are on youtube. We are measuring a very low amount of vacuum.
Normal is -.50 to -.60 of water.
Normal is -.50 to -.60 of water.
Bioburner
Moderator
Thanks for the quick reply, will give that a try
park4019
Thanks for the quick reply, wll give it a try !
park4019
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