stoker-man wrote:You probably wouldn't get away with 160/180 in the Winter either
I wasn't clear enough. I was commenting on what AA130FIREMAN said about his AA and meaning that he probably would have trouble with the 520 even in the Winter at such close settings.
Yes you were not clear as what you were stating the AA or 520 AA yes 520 no that would go for any under fed stoker boiler and for most if not all of the flat bed stokers or incline stoker boilers you need a bigger spread between the low & high set point temp on the Aquastat 20 degrees difference real don't work in most boilers 30 to 40 degrees sometime it
takes a 50 degrees span to make them happy.
AA is a big hand fed like boiler but with a auto feed & ashing feeds the coal from top and ashes from bottom with the fan on the other end pulling the fire up out of the fire chamber and across the the water jacket inside boiler then the exhaust leaves the top of boiler