Efm S15 S20 real difference

Post Reply
 
miner1979570
Member
Posts: 24
Joined: Tue. Jan. 30, 2018 6:48 pm
Stoker Coal Boiler: Gentlemen janitor GJ-9R
Hand Fed Coal Stove: Harman SF250
Coal Size/Type: Buckwheat and Nut

Post by miner1979570 » Fri. Sep. 28, 2018 9:47 am

What’s the real difference between the s15 and s20. The fire pots appear to be the same except for possibly the ash ring. Are the feed rates different, ie 7 clicks instead of 10. Are the cams on the gear box different that drive the ratchet mech. or ratchet gear a different size. Wondering these questions cause I have a s15 and wonder if it could be made into a S20 easily or not

 
User avatar
Rob R.
Site Moderator
Posts: 17980
Joined: Fri. Dec. 28, 2007 4:26 pm
Location: Chazy, NY
Stoker Coal Boiler: EFM 520
Hand Fed Coal Stove: Chubby Jr

Post by Rob R. » Fri. Sep. 28, 2018 9:56 am

The S15 has a smaller ash ring, and a different crank that limits the feed rate to 6 teeth. The ratchet mechanism is the same.

 
miner1979570
Member
Posts: 24
Joined: Tue. Jan. 30, 2018 6:48 pm
Stoker Coal Boiler: Gentlemen janitor GJ-9R
Hand Fed Coal Stove: Harman SF250
Coal Size/Type: Buckwheat and Nut

Post by miner1979570 » Fri. Sep. 28, 2018 12:38 pm

So correct me if wrong but change the ash ring and cam on gear box and now it’s a S20 ?

 
User avatar
StokerDon
Site Moderator
Posts: 7486
Joined: Mon. Nov. 11, 2013 11:17 am
Location: PA, Southern York County!
Stoker Coal Boiler: Gentleman Janitor GJ-5, Van Wert VA-600, Axeman Anderson130 X3.
Hand Fed Coal Furnace: Harman SF3500 reduced down to 3 grates connected to its own plenum
Coal Size/Type: Rice, Chestnut and whatever will fit through the door on the Harman
Other Heating: Noth'in but COAL! Well, Maybe a little tiny bit of wood

Post by StokerDon » Fri. Sep. 28, 2018 4:57 pm

I'm pretty sure it's just the ash ring, 14" vs. 14.5" and the gearbox crank, 6 teeth vs. 8 teeth. There are some variations in the early S-15, S-20's, but if it is 1960's this should be correct.

The later S-20 with the small gearbox and the curved connecting rod will do 10 teeth.

In most cases, 4, 5 or 6 teeth is plenty so it would be easier to just swap the ash ring. 6 teeth would be 15 pounds per hour with Rice coal. Roughly 180,000 BTU.

-Don


 
User avatar
Rob R.
Site Moderator
Posts: 17980
Joined: Fri. Dec. 28, 2007 4:26 pm
Location: Chazy, NY
Stoker Coal Boiler: EFM 520
Hand Fed Coal Stove: Chubby Jr

Post by Rob R. » Fri. Sep. 28, 2018 5:04 pm

The 14" ash ring is fine for 6 teeth of feed.

6 teeth is a fair amount of heat. The only people I know that run over 6 teeth are either heating multiple houses, or heating a commercial building.

 
User avatar
Scottscoaled
Member
Posts: 2812
Joined: Tue. Jan. 08, 2008 9:51 pm
Location: Malta N.Y.
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

Post by Scottscoaled » Fri. Sep. 28, 2018 7:34 pm

Earlier models had a different fire pot. They had the gooseneck where the pot auger tube entered the pot in the bottom middle of the pot. The plate that dumps the fines has more holes in it. Let me see if I can get a picture real quick

 
ryan20strohl
Member
Posts: 145
Joined: Tue. Jul. 03, 2012 10:00 pm
Stoker Coal Boiler: efm coal boiler
Coal Size/Type: rice
Other Heating: Bryant evolution heat pump

Post by ryan20strohl » Fri. Sep. 28, 2018 8:31 pm

Those models are on high boys what scott is talking about

 
miner1979570
Member
Posts: 24
Joined: Tue. Jan. 30, 2018 6:48 pm
Stoker Coal Boiler: Gentlemen janitor GJ-9R
Hand Fed Coal Stove: Harman SF250
Coal Size/Type: Buckwheat and Nut

Post by miner1979570 » Sat. Sep. 29, 2018 11:21 am

Anyone know how tight a fire pot auger is supposed to fit into 2 inch sch40 stainless steel pipe. I just got a “new” one and the clearance seems off a bit to me. There is a half inch between the flights and the pipe. I thought it would fit semi tight like a 1/8 inch clearance. The 30 year old one is the same as the new one.


 
User avatar
Rob R.
Site Moderator
Posts: 17980
Joined: Fri. Dec. 28, 2007 4:26 pm
Location: Chazy, NY
Stoker Coal Boiler: EFM 520
Hand Fed Coal Stove: Chubby Jr

Post by Rob R. » Sat. Sep. 29, 2018 1:22 pm

That is how mine looks.

I had the same thought as you when I first saw it.

 
User avatar
Scottscoaled
Member
Posts: 2812
Joined: Tue. Jan. 08, 2008 9:51 pm
Location: Malta N.Y.
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

Post by Scottscoaled » Sat. Sep. 29, 2018 4:36 pm

IMG_0362.JPG
.JPG | 667KB | IMG_0362.JPG
IMG_0364.JPG
.JPG | 423.3KB | IMG_0364.JPG
IMG_0367.JPG
.JPG | 1.1MB | IMG_0367.JPG

 
User avatar
Scottscoaled
Member
Posts: 2812
Joined: Tue. Jan. 08, 2008 9:51 pm
Location: Malta N.Y.
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

Post by Scottscoaled » Sat. Sep. 29, 2018 4:37 pm

They are the old style stoker. They don't have gas holes in them. The bottom tends to rot out and they are hard to get apart without breaking them. I know some of the earliest 350's came with them as I've taken out three that were purchased new by the owners. I don't know about the highboys. I stay away from them.

Post Reply

Return to “Stoker Coal Boilers Using Anthracite (Hydronic & Steam)”