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excess air when shutter set at 0
Live/Learn
Member Posts: 97
I have a new burnham boiler that was installed last winter and set-up twice by a tech from petro. The first winter I ran a .75 @ 180 psi=1.05gph. I have a small home consisting of 1200sg.ft. plus a finished room in the basement with heat. The home is quite well insulated and I have sealed a lot of heat losing areas. I felt that I was overfing the boiler last winter so this fall I instructed the tech to reinstall the .60 @ 140psi= .75 gph. With the air shutter all the way to "0" we can only get the co down to 11.5. Not bad but that's with setting at "0". There seems to be air opening even with this setting. Band is also at "0". wrong shutter or what? Thanks in advance "go Bush"
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Comments
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What does the burner call for on the nozzle and pump psi? You would be better off looking at firing your system down with the end cone, etc. rather than dropping the firing rate over 25% from the nozzle. (1.05 GPH to 0.75 GPH)Was the system short cycling? You state that you can only get down to 11 1/2 CO2 with 0 and 0 on your air. Don't you mean up to 11 1/2 CO2 with 0 and 0 air? check your Burner for specs. again and see if maybe you see .85 nozzle at 140 psi.
BB0 -
Hi Boston boiler,
My specs call for either of the firing rates depending on the heat demand. Yes my system was short cycling last winter which was a cold one here on the eastern tip of L.I. It would run for about 5 min and then off for about 5 min when therm called for heat. circ would keep running until satisfied. burner seemed to reach high limit too quickly I feel. I have been reading on "the wall" that to be running effeciently burner should run all the while system is calling for heat. Do you agree with this? It almost sounds counterproductive to me but what do I know.The available air is comming from the grove that the locking screw rides in and I can't see a way to eliminate it at "0" air. Thanks for your interest . Go socks!0 -
You have 35% excessive air at 11 1/2% CO2. I don't know what the rest of your system is running at, net stack, SMOKE TEST, OF and breech drafts so there is no way to say your OK or effiency is good. You really should get together with a pro who can get the most out of your system for you. The Burnham with a Beckett is a nice system and you should be able to get good combustion readings from it providing it is set up right. Keep in mind before you change your air settings that you could easily create unsafe CO (carbon monoxide) putting youself and family in danger.
Safety First, then work on the efficiency.
PS BB
The LI can't be Long Island because of the GO SOXS in your post!
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After getting the setup correct,how about this to cut down on cycling and cut fuel usage?http://www.beckettcorp.com/heatmanager/ The Oldtimers on the East End are primarily Sox fans{Yaz was from Bridgehampton}
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You need the low firing rate baffle for the smaller firing rate,I've seen it cause this many times.
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excess air @\"0\"
Hi again Boston, Yes Yaz is from a town 6 miles away . I know him and my Mom worked in the phone company with his Mom. And yea I'm an old timer, 70yrs. old and have lived here all my life. We feel closer to the people of new england as we also are baymen here.About my system my other readings are: stack temp=350 net; draft= .02-.03 ; smoke= 0 effeciency= 83-3/4% thanks for your help!0 -
Heat manager?
Something new everyday Huh? Based on the theory of the old Caddy's with the 2-4-6 cylinders. Hope they perfected it better.
Sox fans in N.Y., never thought I'd ever see that. I would have figured Yaz would have been a turncoat to them rather than bringing fans. I'll watch it all the way once again and would like to see it. Law of average says yes! Bambino says no and Bill Buckner agrees with the Bambino!
BB0 -
thanks teckheat
I looked up that control from beckett looks interesting. What is a low rate baffle? does it go on the end of the gun?
You hit it right about Yaz he has a lot of fans here as he is a local kid having gone to school in Bridgehampton and all. I'm from East Hampton been here all my life except time spent in the seabees. Thanks for your help!0 -
5. WHAT IS THE LOW FIRING RATE BAFFLE, AND WHEN SHOULD IT BE USED?
The low firing rate baffle, or LFRB (FIGURE 5), was designed to control the air flow at the discharge of the blower wheel. The baffle reduces the volume of air from the blower. This allows the air shutter or band to be set with larger openings while achieving the same combustion performance readings. When firing low rates in dusty, lint-laden areas, the wider air openings that accompany the installation of the LFRB help to ensure trouble free operation by reducing the possibility of air inlet blocking.
A secondary function of the LFRB is to regulate the quantity of high velocity air through the center of the retention head. This improves ignition and flame stability. When retrofitting burners with the LFRB, refer to the chart on page 4 for basic guidelines.
MIGHT I NEED THE LOW FIRING RATE BAFFLE?
For pretested I packaged burners, refer to the manufacturers 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 Becketts 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). HEAD FIRING RATE
(GPH) LFRB
F0 0.5 Yes
0.65 Yes
0.75 No
F3 0.75 Yes
0.85 Yes
0.90 No
1.00 No
F6 0.85 Yes
0.90 Yes
1.00 No
L1 0.75-0.85 Yes
V1 0.75-1.00 Yes
SERVICE CHECKLIST FOR MAINTAINING
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