blau barrick wrote:On the pipe coming out of the top there is a branch going to below the pump before the valve. Then after the valve a copper line going to the expansion tank then the main line to the radiators. If I open this I don't expect to heat the house, but maybe prevent frozen pipes and if I'm lucky get a little heat. Do you guys think this would work? The unit was installed 1966 do you think it would be a 5 or S? I need to figure out how to put a picture on here, but that is a little advanced for an idiot like me!
on the tag on the blower housing it will have a S-15 or S-20 .
The S-15 were on the efm 350 and on some early 520 had a smaller Pots & the shorter gear box arm
S-20 was on efm 520's & the larger 520 High boys made from 48 to 54 and later were used on the 350.
S-30 are on efm 700
S-35 are on efm 900
S-45 are on efm 1300 these are the bigger units with a completely different stoker feed with a rotating Pot
S-15 means max feed rate of 15lbs per hr smaller burning pots were used each feed tooth feed rate was 2.5 lbs per hr
with Rice max was 6 teeth feed rate 15lbs per hr 2.5 lbs each tooth.
The early S-20 were 8 teeth feed rate max 20 lbs per hr 2.5lbs per hr each tooth the later S-20 like being used today
are 10 teeth max 25lbs per hr .
They use a longer gear motor arm to give you more stroke 2 extra teeth which can be put on the older S-20 to give you 10 Teeth feed rate max.
S-30 is 10 teeth max 30lbs per hr feed rate is 3 lbs per hr each tooth
S-35 10 teeth max 3.5 lbs per tooth
S-45 10 teeth max 4.5 lbs each tooth 45lbs max per hr.
S-15 & S-20 2.5 lbs per tooth on Rice coal On Buckwheat coal it is 2 lbs per tooth
Add a half lb on the feed rate per tooth on the S-30 S-35 S-45 when burning Rice coal they use a bigger Feed Auger and tube 2" Auger 2.5" Auger tube VS. 1.5" Auger & 2" Auger tube on 350"s & 520"
Now you might have a 350 instead of a 520 look on the blower housing mouth where it gos into the base there will be a 2.5" spacer plate between the blower housing mouth and the base if yours has it then you have a 350 with a S-15 Pot If you do
not have a spacer plate then you have a 520 with a S-15 stoker on it
another way to tell is to take off the Jackets / covers and look at the I.D. plate on front of the boiler above the door or on the back below the water coil area it will give you the make of the boiler Co. that made it and the model 350 or 520 Plus the year it was made