Beckett Oil burner Air Adjustment


Old 01-27-09, 10:10 PM
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Beckett Oil burner Air Adjustment

Hello Experts! I need help understanding my air adjustment settings on my Beckett AFG burner. There is a long and convoluted story behind why I need help with this, but leave it to suffice that it involves a number of 'professionals' and, of course, adjusting the burner by eye (i.e. walking outside and looking at the chimney) and leaving the air shutter and air band loose.

I have a 14 year old Rheem that is as-delivered from the factory, except that I have replaced the 1.0 nozzle with a 0.75 in an attempt to use less oil and increase my furnace cycle time. Turns out the furnace is about three times what the house needs according the the 'manual J' calculation, and it only ran for about 3 minutes at a time as delivered.

So, the furnace is in factory-form, and the nozzle depth has been adjusted properly (type 'f' head, 1 3/8" depth). Rheem actually reports 'proper' settings for their burners in factory prepped situations, and I'd like to get back there. (RONC-112 with .75 = RONC-084 exactly)

what they claim in that spreadsheet is the air settings are 's7/b0'. I interpret that as shutter at seven, baffle closed, with the baffle being the large band adjustment and the shutter being the plate at the end of the burner with definite numbers available. IF this is so, it's far, far from where it is now (the band is about 1/4 open). But, according to the stickers stuck on the side of my furnace, it's been maintained by moronic professionals since new (as I've called them, and they said 'you don't need any kind of measurement device to adjust an oil furnace'. Yup, all six of them).

I realize the absolutely correct thing to do is find a real furnace professional with gauges, but I have neither the time to call a billion of them, nor the money to pay one if I found him. For now, I would like to get it back to a factory spec and, although my efficiency might not be perfect, get it running again. I appreciate all your help and any extra advice you might give.

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Old 01-28-09, 02:50 PM
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Your interpetation is correct. Those settings are a "starting point" & not carved in stone but generally pretty close. The nozzle spec'd is usually a Delavan B & the pump pressure 100#.
Old 01-28-09, 02:59 PM
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Thanks! Of course, doesn't matter much now that I've broken my combustion chamber
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