excess air even with shutter at \"0\" on beckett

Unknown

As Steamhead has already stated, there are two firing rates for the V83 Hot Water boilers. The standard firing rate is 1.05 gph utilizing a .85 x 60A Delavan nozzle and 140 psi of pump pressure. The reduced or V83WM firing rate is .75 gph utilizing a .60 x 60A Delavan nozzle and the Low Fire Baffle needs to be installed. Extensive testing has already been done by Beckett and Burnham so there is really no need to experiment with other nozzles, nozzle brands and settings. Your air shutter should remain at a setting of 10 and your Air Band can be lowered to 0.5. Pump pressure stays at 140 psi also. I might add that after these changes are made, the instruments have to be put to this burner to check for proper combustion and clean combustion. Setting up burners is no longer a "by eye" process. Hope this helps.


Glenn Stanton

Manager of Training

Burnham Hydronics

U.S. Boiler Co., Inc.

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Excess air even with shutter at \"0\" on beckett burner

Dear wallies, I have a Burnham V83 with a beckett burner. I seem to have a problem controling excess air. On other systems that I have worked on if I closed the air down completly I could see a very "rich" large and smoky flame. With this burner I don't see much difference as the burner seems to be getting a large amount of air from the adjusting screw slot even with the air at "0". Has anyone else run into this situation and if so how did you handle it? P.S. I have the "band" closed completely. I'm only adjusting the shutter. Thanks Live/Learn

Unknown

What are you using to measure the excess air? What are the combustion analysis readings?


Norm Harvey,
Independent Burner Service,
Weymouth, MA

clammy

static plate

What beckett burner and what is the retention head ,pump pressure ,and noz size and angle .You may need a static plate to lower the air flow or a change of the retention head .In my experence on some downfired burnrs that you need a static plate to cut down the air flow so the air band can effectly adjust inlet air .peace and good luck clammy

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excess air

Hi clammy, I'm using a beckett model AFG with a L1 head with a nozzle range of either .75b-45 degree @ 180 psi or a.60b-60b degree @140 psi . Last year I ran the .75 @180 and had air at 4-1/2 .This year I'm running a .65 (couldn't locate a .60) and even with air at 2 seem to visually have too much air.(flame somewhat pulled in).I had the burner set up by a tech last year also with the supplied .60b-60 and he had air down to "0" and said he still had excess air. What do you think? Live/Learn

Steamhead (in transit)

Double-check your head settings

The L and V series heads take a bit more doing than the fixed F heads that have been used for years. Is this the V83 or the V83S (where S probably means smaller firing rate)? Did it come with the boiler or was it retrofitted? If it's the V83S, is the low-fire baffle in place?

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too much air

Dear Steamhead, It's a V83 able to fire at 1.05gph or .75 gph. After reading data on the burner I realize that I don't have a low firing baffle installed. I'm going to get one and install next week. Thanks for the reply. Should I be able to pick one up at my supply house? Live/Learn

Steamhead (in transit)

Either they will have it

or they will have to order it. There are several of these baffles, the Beckett part number for the one you want is 5880.

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thanks steamhead

thanks steamhead for all your advice i really appreciate it . the wall is a great place to visit as it's not only informative but friendly also. live/learn

J.C.A._3

Live/Learn,

What are your excess air readings?

My personal findings are that somewhere between 25 and 35ish are usually spot on, depending on the equipment and the rest of the test numbers. Chris

Live/Learn

Thanks Glenn,

Thanks Glenn for all the help you contribute on the wall. You are a real asset to your company. I see sometimes people will "down" Burnham but you're still there to "straighten" people out without being disrespectful and you usually prove them wrong about their feelings about your product. Keep up the good work. Live/Learn