lsayre wrote:For those of you with Coal Guns that are equipped with the thermo ash grate control system, what have you found to be the best temperature setting value for set-point S.V.?
Mine came factory pre-set at 140 degrees, but the manual says to set it at 130 degrees (and to never set it lower than 120 degrees). Does it save on coal if set to a lower temperature? I'm assuming that if it is set too low the potential for an out-fire is increased, but the lower it is set, the less likelihood of unburned coal going into the ash pan. Is this a correct assumption?
lsayer, I know since you have the instructions for your unit, this isn't any new info. But, for those that may not be familiar w/ the digital ash grate temp controller, I am adding this excerpt to shine some light on AHS's designed process:
THERMO ASH-MONITORING GRATE CONTROL OPERATION
Ash that contains fuel that is not fully combusted will be a higher temperature than ash coming from thoroughly combusted fuel. The Thermo Ash-Monitoring Control automatically monitors the temperature of the ash leaving the coal pot. This provides a feedback mechanism for grate regulation that reduces the need for post install adjustments. Typically, no adjustment other than the factory adjustment is necessary to have the boiler perform at peak power output throughout the burn season (a minor on-site adjustment may be necessary when the boiler is first installed). With the Thermo Ash Monitoring controlled grate, it is possible for the fire to remain lit for days during low usage periods without having to adjust the grate controls by hand, as would be necessary in a timer-based grate control system.
If an ash temperature sensor is used, it should be set at 130° for normal operation. During periods of light demand, reducing the setting to 120° will aid in maintaining the proper level of coal in the coal pot.