On any heat call by TT the stoker will only be started by the High Limit setting minus it's differential.
CoalBurner5 wrote:My concern was to store water for the heating system.
I feel like i'm still burning to much coal and feel like the system is getting shocked. Right now i am running a honeywell 7224 triple aquastat and have my current temps set at 150 low limit with a 10 differential and high limit at 170 with a 10 differential. As of right now my boiler maintains a 140-150ish temp and every single time that there is a heat call from the thermostat, it triggers the ciruculator to run AND the stoker.
So i guess what i'm asking is does it make sense that the stoker runs everytime that the circulator kicks on? in my mind i'm thinking that the stoker should only stoke when the temp drops below the low limit and on the timer that i have set to run 2 mins every half hour to prevent outfires. Just seems like it runs way to much and i'm losing heat up the chimney.
If the HL is set, as you state, 170 w/ diff. 10, then stoker starts at 160 or less
if/when TT is signaled.
LL has nothing
to do w/ any TT...it just fires the stoker to keep the boiler water above a minimum setting, which as you state is, 140. This keeps the boiler hot for using the tankless coil in the boiler.
Now, if as you say the boiler maintains 140-150ish temps and the circulators AND the stoker fires on a TT call...then this makes perfect sense, as it is below 160.
On a different note: Have you given any thought as to possible ghost flows
due to lack of flow checks?
Excessive ghost flows
can draw the boiler temps down between boiler firings.