efm 520 commercial

efm 520 commercial

PostBy: leward On: Fri Jan 21, 2011 8:26 pm

A guy I know says his EFM520 has a commercial pot. Would this have been a burner out of a 700 or 900 that was substituted to increase output? What kind of BTU's would that put out?
leward
 
Stove/Furnace Make: EFM 520
Stove/Furnace Model: 1

Re: efm 520 commercial

PostBy: coal berner On: Sat Jan 22, 2011 1:24 pm

leward wrote:A guy I know says his EFM520 has a commercial pot. Would this have been a burner out of a 700 or 900 that was substituted to increase output? What kind of BTU's would that put out?

No the 700 900 & 1300 uses a whole different stoker assembly then the 350 or 520.
The first S-15 Pot used a 14" ash ring The S-20 stoker uses a 14.5" ash ring on top of pot
EFM made & still makes a S-22 pot ring that is 15.5" which gives a extra 5k of btu per hr .

The 700 900 ad 1300n Are much bigger pots and the rotate knocking off the ash as well as using bigger Auger's
and tubes .

Feed rates where higher 700 3lbs per hr per tooth max feed rate 10 teeth 30lbs per hr.
With Buckwheat size coal Rice would be 1/2 lb more per tooth . 700 900 1300
900 feed rate 3.5 lbs per tooth 10 teeth max 35lbs per hr
1300 Feed rate 4.5 lbs per hr per tooth max 45lbs per hr

The S-15 stoker pots had a feed rate of 2.5 lbs per hr per tooth 6 teeth max 15lbs per hr
The first S-20 pots 2.5 lbs per hr 8 teeth max 20lbs per hr
The newer S-20 pots 2.5lbs per hr 10 teeth max 25lbs per hr
All with rice coal using buckwheat size the feed rate is 2lbs per hr per tooth .

Look at the links below to see the difference between 350 520 and 700 900 1300

http://www.efmheating.com/manuals/DF520 ... lation.pdf

http://www.efmheating.com/manuals/Stoker%20Manual.pdf
coal berner
 
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520

Re: efm 520 commercial

PostBy: leward On: Sat Jan 22, 2011 5:23 pm

Thanks Coal Berner. I was just curious how EFM did that. So if you wanted to do that today, on a new Boiler, you could still order the S22, and gain 5k in output.
leward
 
Stove/Furnace Make: EFM 520
Stove/Furnace Model: 1

Re: efm 520 commercial

PostBy: stoker-man On: Sat Jan 22, 2011 7:09 pm

You can order the S22 ring, but there are none in stock right now. They must be made at the foundary.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

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