Can't get CO2 below 15% -Peerless JOT

Saggs

I need some help... I've been working on a Peerless JOT-150 4 sect oil fired steam boiler and no matter what I do, I can't seem to get the co2 below 15%. It calls for 140 psi on the pump,a F-6 head, 1.25-80a nozzle. I cleaned it a month ago, set it up by the book, -.03 draft in stack, -.02 over fire, zero smoke etc.. but couldn't get the co2 below 15%? Got a call today, boiler was all sooted up. I pulled the burner and front plate to make sure there were no obstructions or impingements to the flame. None found,set up burner again by the specs. Clean flame, good draft and way too high on the co2(and yes my Bachrach is working properly). The only guess I have is that the flame maybe too large and impinging on the bottom of the section plates(fins). I dropped the pump pressure to 120psi and checked again but co2 was still high. Any suggestions?

T-RACY

i
s flame coming off head when you open air band more ?more air equals less co2 give er some.

ken_36

Peerless C02

Seems like a high firing rate for a 4 section boiler. Have you tried lowering firing rate down to the specs for a 3 section boiler?

Saggs

I haven't looked to see if the flame was lifting off the head or not as I increase the the air. As for the firing rate, it seems kinda high to me but that's what the tag says? I seem to get the same co2 maybe a bit lower as the flame dirtys up. Just the opposite of what you'd expect. Do you think the flamr impingement has somthing to do w/ it? Thx for the responses.

ken_36

high co2

A 125 nozzle at 140 psi is close to a 150. That seems like alot of fire to me.

T-RACY

open the air band until you get a max 12 co2,nobody likes to brush plugged boilers for pay never mind for free.

Al Gregory

Thats the maximum firing rate for that boiler. When we installed them they came with multiple stickers. You could put basically whatever firing rate you wanted on the boiler. It will run alot better with a 1 gallon nozzle at 140. Unless you need all those BTU's I would downfire it to the lower rating.
We always put the larger firing rate sticker on the boiler too because customers thought that bigger was better.

J.C.A._3

Got any CO #'s?

The specs for the JOT aren't on the Peerless web sight any longer....

Are you sure your test equipment is in spec? Sounds like it really isn't. Can you read O2 and CO? This would point ME in the right direction.

Fire is a strange and wonderful creature. Being able to get the specifics from the fire is the key to the best one. You've got to have a bit more information than you're giving for us to help you. I have thoughts, but need more to go on.

#1, make sure the test equipment is up to date and functional.

#B Is the pump pressure in spec....and is the cutoff clean and abrupt?

#3 Have you taken ALL the necessary measurements on the burner, RE: the Z demension?

#D, Is the FAN for the burner clean? You might not think it makes a big difference, but I can prove time and time again that it IN FACT DOES. (Go ahead, ask me how I know!)

#5 15% CO2 will NOT give you 0 smoke every time, but the callbacks will be many. What color is the soot?

These may sound like strange questions to you, but if you can answer them I'd bet dollars to doughnuts....You'd have your answer.Chris

brucewo1b

1.25 80* A @140PSI

Are you sure the 1.25 firing rate isn't for 100PSI at the Pump?? Seems to me you are putting out about 210,000 BTU's out of that nozzle. What is the boiler rateing??

B.S.

Unknown

1.50 GPH

is the minimum for the 4 section JOT . They can be fired up to 1.75 ( I installed alot of them in the day ) . By chance , was this JOT installed in 1985 or thereabouts ? That was the year they had to recall a bunch of em because the pins were too close or the space between the sections was too close .

If you can't get a better CO2 number , I would do as many have suggested and downfire it to maybe a 1.00 GPH and change the head if necessary . Just make sure that stack temp stays up there . Like JCA said , check everything again , make sure it's all in spec and clean . I've seen funny things happen with just a bit of lint stuck on an end cone .

Rodney Summers

here's the beckett oem guide info for the tw-150 jot...

Peerless Heater JO/JOT-TW150
AFG F6 disc:2-3/4" noz:1.25 X 80°A
tube: AF60YB
140psi
chassis B2007
air setting: S-8 / B-1
--------------------------
--------------------------
JOTS are very finicky. i have an old JOT supersection-4 that i've downfired (on a new AFG) from a plate stamped 1.55gph to a .75 70A @ 100psi, using an F3 head & 2 3/4 disc, *with* the addition of the low-fire baffle. i have it set at 11.5% co2 & practically a 0 smoke and it runs pretty smooth. i won't kid you when i tell you that it took at least 3 running cycles to adjust the air band to get it to that 'JOT critcal point'. combustion eff on the digital fyrite reads ~84% with roughly 22ppm co, 29% excess air, and 4.5% o2. i have read many posts that say you *must* keep these animals running at between 11-12.2% co2 or you'll be staring at a brick of HX packed soot by the end of january. i can also tell you that mine was way easier to adjust with a .75 80B nozzle in there but i got the best burn with the 70A - just harder to find the spot. i wouldn't even attempt playing with it without the low-fire baffle & a combustion meter - it'll drive you nuts.

good luck,

ss

Rodney Summers

oh, one more thing.........

does that JOT have the big loose round L-R swinging 4-5" iron observation door on it? - possibly slightly 'flying around in the breeze' a bit as the burner starts & runs? if so, i would flatten it down shut-tight against the burner plate with a piece of (removable) 1/8" wire strapped horizontally across the door from the top left burner plate bolt to the right bolt (just hook-shape the ends over the bolts). i've used 2 pieces of 'hanger wire' - like the U-shaped nail-straps that are used to support copper pipes to the basement rafters. i was never able to get a true consistent combustion reading until i clamped that door down since the chamber would start drawing more air thru there (rather than thru the baro) as the chimney heated up and the over fire draft would change midway into the cycle. made a large difference & also got rid of that annoying 'big chamber' rumble on start up.

ss

Ed N.Y.C.

Peerless

According to the spec. sheet from Peerless the settings are as follows. JO/JOT-TW150 AFG-F-12 Burner Head AFG-F12 Static Plate 2.75" Nozzle Size 1.50 80b Pump Pressure 100psi Air Shutter 5.0 Air Band 2 Hope this helps ED N.Y.C.

Ed N.Y.C.

Peerless

Sorry forgot to turn page. JO/JOT-TW150 AFG-6 Burner head F6 Static plate 2.75 Nozzle Size 1.25 80a at 140 psi Air shutter 10.0 Air band 1. Again Hope this helps ED N.Y.C.

Saggs

Thanks much to everyone for the input. I think I'm going to try downfiring it and see if I can get it in line. I have the old style bachrach but have just changed the firite solution and all is in spec as far as co2 readings.

soot_seeker_5

trust me on this.....

get one of these first.... then go back & visit that beast. you'll never regret it.