Harman SF 2500A Air Adjustments?

royk Posted By royk, Feb 27, 2011 at 7:45 PM

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  1. royk

    New Member 2.

    Feb 27, 2011
    Hello, I am new to the forum and would like some help on understanding and adjusting the air flow to my Harman 2500A wood furnace. Aside from the damper on the ash door there are three other points of air entry into the stove. The first is the idle valve which is on the damper itself. How should this be set? The other two points of entry are two round (screw type) knobs on the main furnace door. What are these for and how should they be set? I ask this because recently the furnace has been 'back puffing' from the damper when the damper closes due to the air temp reaching it's set point (about 200 deg F). The damper closes and then i occasionally get a back puff coming from the damper. I am hoping that the answer to the first two questions can help me solve this last one. I have cleaned the flue twice this year already thinking that may be a cause but it has been relatively clean. The local distributor has not been too much help. Thanks for any help you may offer.

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