mikeandgerry wrote:Only the heaviest loads require three teeth.
Am I to understand that for summertime use, 3 teeth is too much ashing? The heat load on my house is less than half the max BTU output of my AA-130. Two questions: should I adjust the ashing to less or more teeth for summer time use (heating DHW)? Should I adjust the ashing to less or more teeth during the winter? I live in Central Pa, so the winters are not hard like up North.
Also, the ashing temp sensor I have does not have temperature settings, but numbers 1 - maybe 7 or 8... I have it set at 3.5?? I will get the manufacturer of the sensor and report with I get home tonight...
As for the number of teeth, two is most likely the right number unless you are maxing out the capacity of the boiler in which case 3 teeth (or possibly 4) will be required. In my experience, one tooth was possible for my home in the winter which has a requirement of only about 75k btu/h. However, one tooth in the summer was insufficient to build a substantial enough fire for the light load to prevent a fireout on a no load day (like going away for a couple of days). I used 130 degF in the winter and 120degF in the summer for the anthrastat.
As to the 1-8 graduations on an older anthrastat, check with Pete Axeman for translation or get a new anthrastat. I think with my light loads I could fire and forget at two teeth and 130degF. I don't think the difference in coal usage as a result of using those settings would be significant. It is frustrating to have some unburnt coal but I don't think it's worth it to sift it and use it.
The best thing for making your summertime usage more efficient is to increase the load on the unit, i.e. heat your swimming pool along with your DHW! It most likely won't cost you much to heat that load unless you have an olympic-sized pool or the like.