8 Tooth Coal Feed on an EFM 520

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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winter clove inn
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Posts: 7
Joined: Sun. Dec. 26, 2010 8:39 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520

Post Sat. Jan. 22, 2011 1:00 pm

My EFM 520 burns great with a coal setting of 6 and air at 5 1/4. I have tried to raise it higher to an 8 or 10 tooth feed ,and regardless of air settings 6 to 8 ,a lot of unburnt coal spills into the ash bin. When you look in at the fire pot there is a 2 to3 inch wide line of unburnt coal flowing into the ash bin. The flow is always in 7 o'clock position. All the air holes in the pot are clean.The unit is 1 month old.Coal feed pipe is cold. Thanks, Bud

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stoker-man
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Posts: 2063
Joined: Mon. Nov. 19, 2007 9:33 pm
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Sat. Jan. 22, 2011 2:40 pm

Is the clean-out cover on the bottom of the pot fully closed? Is the lever pushed all the way back? It doesn't seem that any of the plates are broken or blocked, but check again. Do you pull the clean-out lever fully open while the motor is running each day or so? Are there undumped fines in the bottom of the pot?

Look at the vanes on the fan blade in the stoker through the side opening. Is the fan blade turning in a counterclockwise direction?

How old is the worm? Are there any sharp edges on the worm in the area of the bottom of the pot?
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winter clove inn
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Posts: 7
Joined: Sun. Dec. 26, 2010 8:39 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520

Post Sat. Jan. 22, 2011 3:13 pm

Thanks for the prompt reply.The fan is counterclockwise and the worm is new.I'll check the other things.

winter clove inn
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Posts: 7
Joined: Sun. Dec. 26, 2010 8:39 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520

Post Sun. Jan. 23, 2011 5:55 pm

I checked everything you suggested and it all looks fine, but unburnt coal still spills over.Could it be an air adjustment ? I was also wondering if it could be the position of the worm relative to the pot.The end of the worm is about 1/2 inch short of the center line of the pot.
Thanks,Bud

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stoker-man
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Posts: 2063
Joined: Mon. Nov. 19, 2007 9:33 pm
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Sun. Jan. 23, 2011 6:15 pm

Interesting.

I don't know where the auger ends inside the pot, but I'm sure someone does. When you say it's brand new, do you mean it's a 2010 model? Your problem is unusual since everything else checks out.
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Scottscoaled
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Posts: 2597
Joined: Tue. Jan. 08, 2008 9:51 pm
Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup
Location: Malta N.Y.

Post Sun. Jan. 23, 2011 8:59 pm

Open the ash door and look up at the bottom of the burn pot. Maybe the bottom plate is warped. Or there could be a build up of fines. :)
I think a man does what he can, untill his destiny is revealed. Right now that is trying to sell my EFM plate boilers in 520 and 700 sizes.

winter clove inn
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Posts: 7
Joined: Sun. Dec. 26, 2010 8:39 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520

Post Mon. Jan. 24, 2011 7:14 pm

I looked in the ash pit ,no fines and the opens closes and fits perfectly. Has anyone fired a 520 for an extended time with a coal feed greater than 6 teeth? Thanks, Bud

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stoker-man
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Posts: 2063
Joined: Mon. Nov. 19, 2007 9:33 pm
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Mon. Jan. 24, 2011 7:27 pm

Yes, at efm, we burned 11 teeth all winter long for 9 tons
There's something that you're missing somewhere.
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CoalHeat
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Posts: 8327
Joined: Sat. Feb. 10, 2007 9:48 pm
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Baseburners & Antiques: Sears Signal Oak 15 & Andes Kitchen Range
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert
Location: Stillwater, New Jersey

Post Mon. Jan. 24, 2011 7:33 pm

The unit is 1 month old.
Is this a new EFM?
Heating a circa 1832 farmhouse with a Harman Magnafire Mark I & a 1959 EFM 350 (heating DHW).
100% Oil Free!
"It's what we learn after we think we know it all that counts."

winter clove inn
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Posts: 7
Joined: Sun. Dec. 26, 2010 8:39 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520

Post Mon. Jan. 24, 2011 9:12 pm

We bought it last fall.It was left over from2009.
It was fired the first time a month ago.

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Scottscoaled
Member
Posts: 2597
Joined: Tue. Jan. 08, 2008 9:51 pm
Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup
Location: Malta N.Y.

Post Mon. Jan. 24, 2011 9:30 pm

Is the pot level or tipped toward the front? :)
I think a man does what he can, untill his destiny is revealed. Right now that is trying to sell my EFM plate boilers in 520 and 700 sizes.

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stoker-man
Verified Business Rep.
Posts: 2063
Joined: Mon. Nov. 19, 2007 9:33 pm
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Mon. Jan. 24, 2011 10:30 pm

If it's new, you should have it checked out as possible warranty.
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