lsayre wrote:Another good reason to periodically fire the boiler, as this increases the draft by heating up the chimney.
Just a thought
With all this extra firing going on,will it over heat the boiler water and make it dump when there no call for heat.
ALSO-don't the coal guns boiler water temps. control the blowers to turn on when the water temps. drop. If so,the boiler temps. will decrease before the fire dies out and refire the coal.It seems the only way the fire could go out is if extended days of power loss or no coal in the hopper, or too low of boiler temp. settings. Or have I missed something.
I'm not sure that 2 minutes of firing (running the combustion fan) out of every hour is excessive. Also, the plan here is to have this 2 minute firing happen only when required, and not 2 minutes out of every 60 regardless of whether it is necessary or not. The Tork ACT120MFS 60 minute repeat cycle timer resets to zero minutes counted down each time that current to it is interrupted, and the relay is intended to interrupt the current to the timer whenever a standard (conventional) call for the combustion fan to cycle is achieved.
Whenever the boilers internal temperature drops to below 170 degrees (or 10 degrees below whatever temperature you have your aquastat set for, with mine being set for 180 degrees) the combustion fan motor will cycle on. If there has been an extended period of no combustion blower activity leading up to this point and the fire is thereby "sleepy" then at this juncture the fire can potentially go out. It actually happened to me the very first time I fired mine up. Hasn't happened since though. And yes, I did experience the nasty phenomenon of 300 lbs. of completely unburned coal sitting in my ash pan area....
I've noticed that recovery from a really sleepy fire can require the blower to run for as much as 45 minutes non-stop in order to recover from (and save) the barely hanging on fire, so asking the blower to run for 2 minutes out of 60 does not (to me at least) seem excessive.