ka6 settings for dhw

ka6 settings for dhw

PostBy: 1975gt750 On: Fri Apr 25, 2014 9:47 pm

hello everybody I helped my neighbor install a ka-6 last fall. the boiler ran great for the winter but now I am trying to fine tune it for dhw only. right now I have 2 pins every ten minutes aquastat set at low 140 and high 160 with the dump set at 180 stoker adjustment set at 15 turns out. it seem to working ok but using a lot of coal. seems to be using 2/3 to3/4 a bag a day. I have my kaa2 fine tuned to burn 11 pounds a day for dhw. was wondering what other people are using as setting and coal consumption on a ka-6
1975gt750
 
Stoker Coal Boiler: keystoker kaa-2
Coal Size/Type: rice coal / blaschak
Other Heating: pensotti oil boiler with riello 40 burner
Stove/Furnace Make: keystoker
Stove/Furnace Model: kaa-2

Re: ka6 settings for dhw

PostBy: PRengert On: Sun Apr 27, 2014 8:31 am

You should be able to get to 15-20 pounds/day. I think the key is to use a lot of air (I use full on both) and timer (start with 8 pins/15 minutes) and a low feed rate. Your dump temp is too low- Keystoker recommends something like 220.
PRengert
 
Stoker Coal Boiler: Keystoker K6

Re: ka6 settings for dhw

PostBy: 1975gt750 On: Sun Apr 27, 2014 9:06 am

i only lower the dump to 180 for dhw only during the heating season the dump is 220. I figure during dhw the is no need to leave that hot of water in the boiler when I can just put it into my hotwater tank
1975gt750
 
Stoker Coal Boiler: keystoker kaa-2
Coal Size/Type: rice coal / blaschak
Other Heating: pensotti oil boiler with riello 40 burner
Stove/Furnace Make: keystoker
Stove/Furnace Model: kaa-2

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Re: ka6 settings for dhw

PostBy: gaw On: Sun Apr 27, 2014 9:53 am

If my memory is correct Keystoker recommends winter aquastat settings of 180 high – 160 low and summer settings of 180 high – 140 low. My philosophy is to let things alone as much as possible, if it aint broke don’t fix it. I compromised and set my aquastat to 180 high – 150 low and let it there all year long. Draft is good so the main air is wide open and the little blower is about quarter to a third open. The KA6 is a bit oversize for the load I put on it so my coal feed is cut back a little, I may have an extra inch of dead ash than what is called for by the folks at Keystoker but it seems to work fine for me. I don’t touch the feed rate – ever. My timer is the old Keystoker type, no pins, but it runs the stoker for a little less than a minute every 15. My summer coal consumption is about 15 pounds per day. This has been consistent since I started using the KA6 and even when I burned buckwheat and now rice there was no discernable difference in the amount burned per day.
1975gt750, I see your in NH you guys are still making heat, I know I am here in PA. When I look at my consumption spreadsheet I see that my hot water only months are May through September.
gaw
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice from Schuylkill County

Re: ka6 settings for dhw

PostBy: ytseman3 On: Tue May 20, 2014 12:16 pm

gaw wrote:If my memory is correct Keystoker recommends winter aquastat settings of 180 high – 160 low and summer settings of 180 high – 140 low. My philosophy is to let things alone as much as possible, if it aint broke don’t fix it. I compromised and set my aquastat to 180 high – 150 low and let it there all year long. Draft is good so the main air is wide open and the little blower is about quarter to a third open. The KA6 is a bit oversize for the load I put on it so my coal feed is cut back a little, I may have an extra inch of dead ash than what is called for by the folks at Keystoker but it seems to work fine for me. I don’t touch the feed rate – ever. My timer is the old Keystoker type, no pins, but it runs the stoker for a little less than a minute every 15. My summer coal consumption is about 15 pounds per day. This has been consistent since I started using the KA6 and even when I burned buckwheat and now rice there was no discernable difference in the amount burned per day.
1975gt750, I see your in NH you guys are still making heat, I know I am here in PA. When I look at my consumption spreadsheet I see that my hot water only months are May through September.



You said there was not much difference in the amount you burned from buck to rice, did you have to adjust the combustion air when changing coal size or did you use the same setting? I have a different stove than you, I have a Keystoker 90 but am going to switch to buck from rice. Just wondering if I need to cut back on air. Keystoker says I can leave it at 1/2 open which is factory setting.
ytseman3
 
Hot Air Coal Stoker Stove: Keystoker 90
Coal Size/Type: Rice
Other Heating: Vent free propane fireplace+electric baseboard

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