A.O. Smith Stoker Motor Rotation...Check Your Rotation !!

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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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 Wed. Nov. 25, 2009 6:38 am

A.O. Smith motors are labeled as being counterclockwise rotation and are shipped that way. Apparently, the quality control has slipped and quite a few motors are in the marketplace and on your efm stokers that may be turning in the wrong direction.

Looking into the fan housing from the outside at the shaft end of the motor, the fan should be turning in a counterclockwise direction. If it is not, there is a reversing switch located on the back of the motor under a black plastic plug. Move the switch to the correct position.

In a typical home, where 4 teeth of feed is used, and the motor rotation is clockwise, you might have had to add more air than the recommended setting to burn the coal properly. In larger applications, when 6 or 7 teeth of feed is used, an air setting of 10 will not be enough air. If you have red hot coals falling off the edge of the burner pot and adding air doesn't correct the problem, check the motor rotation first.

If you have changed the motor rotation, you must readjust the air setting. Start with the recommended 4 feed/4 air setting to obtain the 2 inch wide ash ring.
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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 Wed. Jan. 20, 2010 11:09 am

Just got a call from an experienced coal dealer who was working on a 50 year old stoker, which he claims is the original motor. It is also running in the wrong direction and he sees no way to reverse the rotation. So, I guess this problem isn't new.
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Pa Dealer
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Posts: 244
Joined: Fri. Aug. 15, 2008 10:12 am
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker
Location: NEPA

Post Wed. Jan. 20, 2010 3:43 pm

I've seen low air situations on older boilers (520's and 350's) because the fan housing was so built up with dirt, dust, lint, and fuz that a total cleaning of the housing was in order to get good air flow. :)

R.Y

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