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#129928 - 11/17/04 08:46 AM Beckett burner AFG booms at ignition
haight78 Offline
first timer

Registered: 11/17/04
Posts: 3
Loc: NyY, Upstate
I have a Beckett burner AFG model, .70 76degree A I think. I just recently had the annual cleaning for the Peerless furnace service for the burner. When the burner starts, the motor turns the fan but, ignition does not happen at the same time. There is a shot lag before ignition. Followed by a boom. I had the technition back and he said the fuel pump starts at 80lbs and then jumps to 100lbs. But wasn't sure if the pump was the cause for the boom or if the motor was the problem. He couldn't spend any more time that day because he was behind schedule.I replaced the transformer, it has 17.5k volts. Still seems to boom on ignition. What are the electrode adjustments for a Beckett AFG burner? I have seen a few different numbers and am confused. Also, do you think the pump may in fact be the problem? Any help resolving this problem would be appreciated. Regards, Wayne


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#129929 - 11/17/04 09:01 AM Re: Beckett burner AFG booms at ignition
HeatPro Offline
Carpal Tunnel

Registered: 07/30/04
Posts: 28022
Loc: South New Jersey
You should have an almost instant design pressure from the oil pump. Some burners use a two-pressure pump. Many burners today have an oil delay valve to give the pump time to start with an instant pressure at the nozzle. You will have to give SPECIFIC information as to WHICH Peerless boiler it is, as the manufacturer often suggests 140 psig for this burner and 80 psig is WAY off. Delayed ignition is a serious problem that needs to be fixed before anyone walks out the door.

http://www.beckettcorp.com/product/productdetail.asp?detailid=11


The gap is specified by the OEM manufacturer. Beckett's site has some specs for the location.


Beckett has a setting gauge that specifies the height and gap. Many specify 1/8 to 3/16. One bulletin
specifies 1/8-inch.


Tech subjects list:

http://www.beckettcorp.com/scripts/filesearch/filesearch.pl
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#129930 - 11/17/04 09:52 AM Re: Beckett burner AFG booms at ignition
haight78 Offline
first timer

Registered: 11/17/04
Posts: 3
Loc: NyY, Upstate
HeatPro, I have a Peerless Model JOTW75/125 WPCT installed in 1988. Cast iron, heats domestic hot water as well as baseboard heat. The fuel pump is a Suntec P4-91R single line. The technician says the pump momentarily starts at 80lbs before increasing to 100lbs and says this may be creating the delayed ignition but wasn't sure. He wanted to set another appointment so he could spend more time because he "didn't want to just replace parts." But I wanted more information before I called him back. Also some of these things I am able to check myself. I hope this helps. The Beckett link you provided didn't seem to list the electrode settings for their AFG burner but, is 1/8" gap,1/2" over, and 1/16" ahead of nozzle sound right for this burner. Thanks for you help, Wayne

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#129931 - 11/17/04 10:50 AM Re: Beckett burner AFG booms at ignition
HeatPro Offline
Carpal Tunnel

Registered: 07/30/04
Posts: 28022
Loc: South New Jersey
The burner is not set universally in all heaters. It is inside a Peerless JOT and must be set according to the Peerless installation manual as each burner specification is a result of operating the burner IN THE BOILER at the Ohio facility. The settings can and often differ in each different boiler. The AFG burner is installed when higher pressures in the fire chanber are expected. The tech is probably going back to find what the settings should be by reading the Peerless JOT service manual.

As you can see, the settings you want to use are a bit different for another heater:
http://www.summeraire.com/mini_manual.pdf

http://www.thermodynamicsboiler.com/bulletin12.htm

You have given the general specs; but you still don't know which burner head you have. that affects the setup.
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#129932 - 11/17/04 11:35 AM Re: Beckett burner AFG booms at ignition
haight78 Offline
first timer

Registered: 11/17/04
Posts: 3
Loc: NyY, Upstate
Thanks for the links Harold. Is the air guide they describe in the link factory installed? I'll have to make sure this is on the burner. If it isn't there, can I purchace one to install? I have a AFG with a F-3 burner head. Does this give you enough information for set up adjustments? Regards, Wayne

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#129933 - 11/17/04 11:40 AM Re: Beckett burner AFG booms at ignition
HeatPro Offline
Carpal Tunnel

Registered: 07/30/04
Posts: 28022
Loc: South New Jersey
That gives pertinent information for someone that has the service manual for the Peerless boiler you have. I don't have one, so I don't like to guess. I would have to call Peerless or someone who has that burner setup book, as does the tech who is probably arranging that now.

In reply to:

For pretested I packaged burners, refer to the manufacturer’s information to verify that you have the correct factory-tested combination specified to achieve the best overall performance. Also, remember that most modern appliances have multiple firing rates. For example, four rates may be fired with the same retention head, but only two of the four firing rates may utilize the LFRB. How do you locate this important information? Consult the OEM installation information, contact the manufacturer, refer to Beckett’s new updated "OEM Spec Guide For Wholesalers & Installers" (Beckett no. 6711), or call Beckett Technical Services at 1-800-OIL-BURN (1-800-645-2876).



http://www.thermodynamicsboiler.com/bulletin12.htm

In reply to:

Setting the electrodes can be tricky the burner manufactures recommend different settings but here are some guide lines that usually work fine. Set the electrodes flush with the plane of the nozzle (the air from the combustion blower will blow the arc plasma into the oil), Set the gap from 1/8 to 3/16 of an inch. A good field setting is to just be able to slide two pennies through the gap. The height of the electrodes will usually take care of it self, but if not try to set it between the top of the nozzle and the flame retention ring. The spark must not jump to the ring.




http://toad.net/~jsmeenen/oil.html
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