A.O. Smith stoker motor rotation....check your rotation !!

A.O. Smith stoker motor rotation....check your rotation !!

PostBy: stoker-man On: Wed Nov 25, 2009 7:38 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.
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: A.O. Smith stoker motor rotation....check your rotation !!

PostBy: stoker-man On: Wed Jan 20, 2010 12:09 pm

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.
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: A.O. Smith stoker motor rotation....check your rotation !!

PostBy: Pa Dealer On: Wed Jan 20, 2010 4:43 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
Pa Dealer
 
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker