The AF150 efm automatic coal stoker furnace

Re: The AF150 efm automatic coal stoker furnace

PostBy: Tirpak On: Tue Nov 22, 2011 9:51 pm

Thank you. I am going to look into how much money it may cost to refab this s-20 stoker. I think getting it apart will be my biggest issue. I need to replace the feed tube, worm and grates. Any suggestions on the best way to get it apart?
Tirpak
 

Re: The AF150 efm automatic coal stoker furnace

PostBy: stoker-man On: Wed Nov 23, 2011 6:36 am

You should be able to figure out the construction by viewing these pictures. The hardest part of the job might be removing the air tube that joins the stoker and pot. I used to use a torch and sliding hammer, but sometimes it came right out. The key is: how long was the assembly sitting in a damp area.


Pictorial of all DF520 Stoker Parts and Assemblies
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

Re: The AF150 efm automatic coal stoker furnace

PostBy: EarthWindandFire On: Mon Jan 09, 2012 7:28 pm

My father-in-law has mentioned to me that he wants a coal furnace. But, he never wants to fill a hopper with a bag of coal when he finally retires and gets too old for such things. Since the efm can be auger-fed from a coal bin, this might be the perfect coal furnace for him.

We live in Connecticut so no dealers are nearby. Has anyone bought one recently and know the cost?

Thanks!
EarthWindandFire
 
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Hand Fed Coal Stove: Hitzer model 75.
Other Heating: Oil and Natural Gas.

Re: The AF150 efm automatic coal stoker furnace

PostBy: EarthWindandFire On: Mon Dec 30, 2013 10:12 am

Why is the firing rate so different from the 520 when they use the same stoker?

Firing rates from 10 lbs of coal per hour to 17 ½ pounds of coal per hour. (100,000 to 150,000 bonnet BTU/Hr.)


I noticed that the Van Wert has a very high minimum firing rate of 10 lbs per hour as well. The 520 can be fired as low as 2-1/2 lbs per hour.
EarthWindandFire
 
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Hand Fed Coal Stove: Hitzer model 75.
Other Heating: Oil and Natural Gas.

Re: The AF150 efm automatic coal stoker furnace

PostBy: McGiever On: Mon Dec 30, 2013 11:51 am

;)
Last edited by McGiever on Mon Dec 30, 2013 5:30 pm, edited 1 time in total.
McGiever
 
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hot Air Coal Stoker Stove: HARMAN MAGNUM
Hand Fed Coal Stove: RADIANT HOME AIR BLAST
Baseburners & Antiques: OUR GLENWOOD 111 BASEBURNER "1908"
Coal Size/Type: PEA / ANTHRACITE, NUT-STOVE / ANTHRACITE
Other Heating: Ground Source Heat Pump
Stove/Furnace Make: Hydro Heat /Mega Tek

Re: The AF150 efm automatic coal stoker furnace

PostBy: Pacowy On: Mon Dec 30, 2013 1:03 pm

The 10 lb/hr corresponds to the recommended minimum setting of 4 teeth of feed. The unit doesn't actually burn 10 lb/hr at that setting unless needed to carry the load. Absent any load, the unit would normally "idle" by running 3-4 or so minutes every hour on timer cycles, corresponding to coal consumption of 0.5-0.7 lb/hr. Does that help?

Mike
Pacowy
 
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite

Re: The AF150 efm automatic coal stoker furnace

PostBy: EarthWindandFire On: Mon Dec 30, 2013 1:23 pm

That 10-lbs of coal per hour must scare away a lot of potential buyers. 10 x 24 is 240-lbs of coal per day which can get pretty expensive. ;)

I also doubt you'll find these in very many residential homes. They must be geared more toward commercial users.

I also took notice of the following which must be a recent change:
A new electronic efm Stoker Timer with Relay. The timer prevents outfires when there is a long period between calls for heat. The electronic timer is easy to set and adjust. No guessing or waiting to verify the settings.
EarthWindandFire
 
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Hand Fed Coal Stove: Hitzer model 75.
Other Heating: Oil and Natural Gas.

Re: The AF150 efm automatic coal stoker furnace

PostBy: Rob R. On: Mon Dec 30, 2013 7:01 pm

EarthWindandFire wrote:That 10-lbs of coal per hour must scare away a lot of potential buyers. 10 x 24 is 240-lbs of coal per day which can get pretty expensive. ;)


If they aren't scared by the 1.0 gallon per hour firing rate stamped on their oil furnace, I would hope 10 lbs/hr of coal isn't a shock.

Why is the firing rate so different from the 520 when they use the same stoker?


The AF150 heat exchanger can't handle the full output of the stoker.

As for the Van Wert, the feed rate is only changed by changing the pulleys on the stoker; it is normally "factory set".
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy