Black in Ash?? EFM520DF

Black in Ash?? EFM520DF

PostBy: maxpower_454 On: Thu Dec 15, 2016 12:27 pm

I have a EFM520DF running 4 teeth and 5 air. I'm getting black in my ash. Picture attachedr from 4.5 to 5 definitely helped but is there any danger from going too high on the air? Should I raise the air more or could that cause it to burn too low in the pot?
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maxpower_454
 

Re: Black in Ash?? EFM520DF

PostBy: windyhill4.2 On: Thu Dec 15, 2016 12:38 pm

The air adjustment is supposed to be set for a 2" ash ring around the outer edge of the pot,forget about those useless black pieces,they are either inferior coal,or black shale or coal that has burnt & just didn't fall to pieces.
Adjusting the air too high will cause the fire to burn low in the pot,which in turn heats the grates above their design.
windyhill4.2
 
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Re: Black in Ash?? EFM520DF

PostBy: Richard S. On: Thu Dec 15, 2016 12:40 pm

You can never expect to not have some black with a stoker, I don't have an efm but a Van Wert which is similar. We increase the air until there is little or no change in the ash and then back it off a little. There is a balance here, increasing the air helps with getting full burns but you're also putting more heat out of the chimney.

Pictures can sometimes be difficult to tell and the coal makes a difference too but those ashes look pretty good.
Richard S.
 
Stoker Coal Boiler: Van Wert VA1200
Coal Size/Type: Buckwheat/Anthracite

Re: Black in Ash?? EFM520DF

PostBy: dave28 On: Thu Dec 15, 2016 1:23 pm

maxpower_454 wrote:I have a EFM520DF running 4 teeth and 5 air. I'm getting black in my ash. Picture attachedr from 4.5 to 5 definitely helped but is there any danger from going too high on the air? Should I raise the air more or could that cause it to burn too low in the pot?

Your ash looks similar to mine and I figure it's hard to get every piece burnt or as Windy said it could be either inferior coal,or black shale.
dave28
 
Stoker Coal Boiler: EFM520
Coal Size/Type: Blaschak Rice
Stove/Furnace Make: Aspen Air Handler

Re: Black in Ash?? EFM520DF

PostBy: Rob R. On: Thu Dec 15, 2016 3:24 pm

windyhill4.2 wrote:The air adjustment is supposed to be set for a 2" ash ring around the outer edge of the pot,forget about those useless black pieces,they are either inferior coal,or black shale or coal that has burnt & just didn't fall to pieces.
Adjusting the air too high will cause the fire to burn low in the pot,which in turn heats the grates above their design.


What he said. And I will add that excessive air just sends more BTUs up the chimney.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Black in Ash?? EFM520DF

PostBy: ben On: Thu Dec 15, 2016 5:06 pm

I think your ash looks good.

My air is at 5.5
ben
 
Stoker Coal Boiler: EFM 350 with an S-20 pot (1966)
Coal Size/Type: Rice

Re: Black in Ash?? EFM520DF

PostBy: maxpower_454 On: Thu Dec 15, 2016 11:46 pm

Ben - how many teeth are you running?

Thanks for all the comments
maxpower_454
 

Re: Black in Ash?? EFM520DF

PostBy: Rob R. On: Fri Dec 16, 2016 6:31 am

If you think the amount of unburned material in the ash is excessive (it doesn't look like it is), try some different coal.

I am running my stoker on 4 teeth and 4.5 air, and this is what the ash looks like:

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Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Black in Ash?? EFM520DF

PostBy: ben On: Fri Dec 16, 2016 8:16 am

Max my teeth are 4.

It's 7 degrees this am my house is 72. My EFM is running for 4 to 5 minutes then shuts off for 20 min or so.
ben
 
Stoker Coal Boiler: EFM 350 with an S-20 pot (1966)
Coal Size/Type: Rice