Coal boiler draft setting

Re: Coal boiler draft setting

PostBy: franco b On: Fri Oct 25, 2013 2:37 pm

The fan opening of the oil boiler will kill some draft but other than that I would inspect the chimney.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Fri Oct 25, 2013 2:56 pm

Lightning wrote:Hmmm..... wow ya know that tells me your chimney is restricted since it can pull hard, but at the same time won't take a big volume, like when the load door is open. But at the same time, the manual easily chokes it too. Something don't add up. I would check the whole length, from the breech of the furnace all the way to the chimney top. How do you prevent the oil burner from allowing room air into the chimney when it's not in use?

Edit: I saw the mano.

I took a look up the chimney today. It's looks to be clear from the bottom to the top. The liner in the chimney is clay and is 6"X6" square. The chimney is about 30 feet tall.
I took this pic through the cleanout at the base of the flue:
Image
I opened the top door to the heat exchanger, It's clear right to the chimney and I can see that the manual damper is wide open.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Fri Oct 25, 2013 3:09 pm

Rigar wrote:
imaddicted2u wrote:
Lightning wrote:I hear ya lol. I love my barometric.... How about a manual damper? You could control draft with that too, safely using wood.

I installed a manual damper but if I close it, even a little, smoke comes rolling out the air intake in the door and around the door. As a matter of fact, smoke rolls out the door whenever I open it, whether the barometric is set to open or when it is forced to remain closed, even though I measure plenty of draft both at the breech and over the fire.



...something is amiss
...got a better pic of ur set up?
...is the oil boiler running when this happens ????

This is a better pic of the setup. The Coal/wood is on left and oil is on the right. Both boilers are never operating at the same time.
Image
Last edited by imaddicted2u on Fri Oct 25, 2013 3:12 pm, edited 1 time in total.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

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Re: Coal boiler draft setting

PostBy: Lightning On: Fri Oct 25, 2013 3:11 pm

Some room air might be getting thru the oil burner. Try sealing that for improvement. I'm out of ideas lol also check to see if your ash pan door is sealing good. Excessive draft there would make yer wood burn up fast too.
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Coal boiler draft setting

PostBy: Rigar On: Fri Oct 25, 2013 4:25 pm

imaddicted2u wrote:
Rigar wrote:re read ur first post...
you got a good deal on ur draft guage..??
is it used ??-more importantly....is it working accurately?

The good deal was for a brand new Dwyer manometer as shown in the pic. I got it on ebay.
The draft gauge is a Dwyer manometer filled with the proper gauge oil. It has been properly zero'd. Being a simple device with no moving parts, I see no reason to question its accuracy.


...just makin sure- lol
one thing at a time i guess :lol:
..thats a tall chimney...which i would think could create even better draft than ur mano indicates.
possibly it is cooling too fast/easily (is it totall exterior?)
clean out door seals up good?? good hieght over roofline??
double check the oil burner connection at thimble
one more dumb thought-- can you demand the oil boiler to fire and keep an eye on ur baro ?...you should see some movement momentarily. Initially it should close completely...
..just thinkin aloud
again...thats a tall stack...may be tough to get drafting well until its colder outside
is this a new problem btw ??
Rigar
 
Hot Air Coal Stoker Furnace: Keystoker A 150
Coal Size/Type: anthracite rice
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A 150 warm air furnace

Re: Coal boiler draft setting

PostBy: Rigar On: Fri Oct 25, 2013 4:29 pm

almost forgot- what heats the DHW...cant tell if its electric or not
...if not...where does it vent to ???
Rigar
 
Hot Air Coal Stoker Furnace: Keystoker A 150
Coal Size/Type: anthracite rice
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A 150 warm air furnace

Re: Coal boiler draft setting

PostBy: Rigar On: Fri Oct 25, 2013 4:33 pm

ok- last thought....but your baro looks like its open somewhat in ur last pick ??
...just timing ?
Rigar
 
Hot Air Coal Stoker Furnace: Keystoker A 150
Coal Size/Type: anthracite rice
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A 150 warm air furnace

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Fri Oct 25, 2013 5:35 pm

Rigar wrote:
imaddicted2u wrote:
Rigar wrote:re read ur first post...
you got a good deal on ur draft guage..??
is it used ??-more importantly....is it working accurately?

The good deal was for a brand new Dwyer manometer as shown in the pic. I got it on ebay.
The draft gauge is a Dwyer manometer filled with the proper gauge oil. It has been properly zero'd. Being a simple device with no moving parts, I see no reason to question its accuracy.


...just makin sure- lol
one thing at a time i guess :lol:
..thats a tall chimney...which i would think could create even better draft than ur mano indicates.
possibly it is cooling too fast/easily (is it totall exterior?)
clean out door seals up good?? good hieght over roofline??
double check the oil burner connection at thimble
one more dumb thought-- can you demand the oil boiler to fire and keep an eye on ur baro ?...you should see some movement momentarily. Initially it should close completely...
..just thinkin aloud
again...thats a tall stack...may be tough to get drafting well until its colder outside
is this a new problem btw ??

Not a new problem. The previous owners had same issue when burning coal. There is about 5 feet above the peak of the roof. The chimney is interior.
With no fire on today the draft is showing about 0.02" outside temperature is 46F and draft regulator is closed . With a wood fire on and the baro-damper closed I've seen draft reading as high as 0.08". All pipe connections are sealed with hi-temp RTV and smoke pipes are in like new condition. I'll fire up the oil burner next time I have a wood fire on and see what the draft regulator does.
The doors seal as well as any 1957 boiler can seal...lol, given that it relies on metal to metal contact. I did glue a wood stove rope seal to the top (heat exchanger) door because the metal had deteriorated.
This boiler has two possible sources for combustion air. One is on the back and feeds air into the ash pit under the fire up through the grates, the other is through the loading door and feeds air over the fire. In time I'll figure out which combination is best to use.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Fri Oct 25, 2013 5:36 pm

Rigar wrote:almost forgot- what heats the DHW...cant tell if its electric or not
...if not...where does it vent to ???

It's electric so no vent.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Fri Oct 25, 2013 5:50 pm

Rigar wrote:ok- last thought....but your baro looks like its open somewhat in ur last pick ??
...just timing ?

Nope, not timing. I took the pic when I had a wood fire on and the weight on the baro was set to control the draft at the breech of the coal/wood boiler at 0.05"and using this setting with no fire on the baro closes, the draft drops to around 0.02".
Prior to this experiment I ran with the weight on the baro set so that it never opened since I'm not using the oil boiler anyway.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Fri Oct 25, 2013 6:43 pm

Lightning wrote:So when you close the manual damper, the reading on the draft gauge starts falling towards zero right?

Yes
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Fri Oct 25, 2013 6:47 pm

Rigar wrote:
imaddicted2u wrote:
Rigar wrote:re read ur first post...

one more dumb thought-- can you demand the oil boiler to fire and keep an eye on ur baro ?...you should see some movement momentarily. Initially it should close completely...
..just thinkin aloud

Yep, as soon as the oil burner starts, the baro-damper closes and that's with a fire in the coal boiler.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Coal boiler draft setting

PostBy: Lightning On: Sat Oct 26, 2013 9:10 am

Well, getting back to burning coal, I think you'll need to seal those doors better. Especially the ash pan door. Perhaps glue a rope gasket around it like you did with the load door. Coal is pretty sensitive to primary air control. It doesn't take much lol. :D
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Sat Oct 26, 2013 12:43 pm

Lightning wrote:Well, getting back to burning coal, I think you'll need to seal those doors better. Especially the ash pan door. Perhaps glue a rope gasket around it like you did with the load door. Coal is pretty sensitive to primary air control. It doesn't take much lol. :D

I thought about sealing the ash pit and loading doors and I may be wrong on this but I decided not to because combustion are is fed into the ash pit so I figure that to compensate for any door leaks I would need to close down the combustion air into the ash pit a bit. Same goes for the loading door, there is a combustion air damper in it too.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Coal boiler draft setting

PostBy: imaddicted2u On: Sat Oct 26, 2013 12:49 pm

In case anyone is interested, here jpg's of the manual for my Severn:
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imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

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