Beckett AFG burner blast tube options


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Old 09-12-08, 07:56 AM
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Beckett AFG burner blast tube options

I am replacing the problematic Weil QB-180 burner on my Weil McLain WTGO-3 boiler with a Beckett AFG that has the cleancut pump and genisys primary. The old burner goes through electrodes quickly and is has an internal leak somewhere and goes out once a winter for the last 6 years.

There are 2 blast tube options, the L1 head (AFG50MB) or the F3 head (AF53XN). I think the L1 is a newer one and maybe more efficient. The F3 is more common and still in production. Any suggestions on whether to go with the L1 or the F3? They require a different nozzle...a 45deg vs. a 70deg. I am currently running a .65gph on the QB-180 (works well when it is working) with the pump at 150psi and am thinking of going .75 and 140 on the new setup.
 
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Old 09-12-08, 10:02 AM
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Did you call Beckett to talk to one of their tech guys? They usually make a recommendation based on the type of boiler you have.
 
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Old 09-14-08, 10:17 AM
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Air Tube

Generally the L1 head with the AFG50MBAS air tube combination burns much cleaner than does the F3 head with it's suggested air tube combo. What is the number of the burner chassis? The factory nozzle is a .85x45 'B' Delavan with a Hago as the second choice. If you are currently firing a .65 nozzle @ 150#, I see no reason to go to a .75 @ 140# provided the boiler gives you enough heat & hot water AND the stack temperature is high enough to prevent condensation in the chimney.
 
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Old 09-18-08, 10:59 AM
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you are right. I spoke with tech support and they gave the nod clearly to the L1. I am sticking with .65gph and 45deg. Thanks for the responses.
 
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Old 09-18-08, 02:34 PM
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Burner set up & testing

I just looked up the initial set up specs for a similar boiler. It uses the same air tube combo as you will be using. Firing a .65 x 45 nozzle @ 140 psi pump pressure, they suggest starting with the air shutter at "6" & the air band on "0". These are just starting settings. Final adjustments need to be made based upon the results of combustion analysis. If you don't have the instruments to perform such analysis, you should call a local service company to do it & make the final adjustments. Failure to test can result in a dangerous condition.
 
 

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