OK, I believe I have got it.lsayre wrote:If there has been an extended period of no fire leading up to this point and the fire is "sleepy" then at this juncture the fire can potentially go out.
The sensed temperature must drop below the SV - the differential setting in order for ashing to be initiated --but as wired from the factory the grate will operate without the combustion blower operating. There has been discussion in another thread on puff-backs and I understand that some have rewired the unit so that the grate will not operate unless the combustion blower is operating but unless you have done that the grate should initiate operation if the sensed temp drops to (or below) the SV - differential setting.lsayre wrote:My S130 Coal Gun quite often sits and idles with the thermo grate controller temperature at below the SV. My grate motor only runs when the combustion blower is running.Bob wrote:I agree with Yanche that a cycle timer is not needed with the AHS and hopper feed. AA uses a cycle timer but I believe the reason AA uses one is because it is necessary to keep the coal topped off--not a need to run the combustion blower.
With the factory setup on the AHS and the thermo grate control the grate will cycle even without the combustion blower running if the ash temp drops below the SV less the set differential.
Interesting. I purchased mine in 2006--it has the Fuji controller for the grate and it is wired with the power supply for the grate hot both when the blower is operating and when it is off. This allows the grate to operate independently of the blower. But the only time I have actually seen that happen is at the end of a blower run. It seems it takes the forced draft to lower the temperature sensed by the grate thermocouple to drop sufficiently to actuate the grate.lsayre wrote:The way mine came new from the factory it does not operate the ash grate motor unless the fan is running. I have not altered anything.
