Different Coal Burn Hotter?

All last year the timer setting was about 3min and 20 seconds to keep the coal burning. This setting was working fine until I started burning coal from Gauley and now the fire keeps going out. I increased the time on the timer, and it still goes out. I have noticed its pegged at the high setting. Recently, I reduced the time on the timer by about a minute, and the fire is not gone out for couple of days. It seems to be running under the high temp setting of 200 around the 190 range since I reduced the timer setting. The ash seems finer too. Does coal from different locations burn hotter or better that would require a different or lower timer setting?

Thanks,

Dave

If the aquastat is at high limit the timer will not cycle stoker unless red timer wire is on b1.





ry

The output of the timer goes to ZR of the Aquastat. I have the oil burner too so I don't think connecting it to B1 would work.

daluds wrote:The output of the timer goes to ZR of the Aquastat. I have the oil burner too so I don't think connecting it to B1 would work.

Using the b1 terminal when on coal will always cycle stoker even at high limit, when on oil the timer is inactive.

No matter where the wire goes, the aquastat won't let B1 or the burner start up above the high limit. If it does, you better change the aquastat.

Some problems with outfires are caused by not having a 40-50 degree difference between the high and low limit of the aquastat. We had our first outfire yesterday at efm. The boiler was lingering at the high limit all day and whether it didn't fire enough during the warm spell or whether the cold water returning to the boiler sent the temperature below the limit of the outfire control (L6006A), I don't know, but I came in and found an ash can full of raw coal yesterday morning. I can hardly imagine if the outfire control had not worked with a feed of 8 teeth for 12 hours! In our case, the heating pipes hold much more water than the boiler, so killing the boiler with cold water is a real concern if the circulator doesn't run for a long period of time.

I think your problem is directly related to the aquastat settings and not the coal. Our stoker is set at 150-200.

stoker-man wrote:No matter where the wire goes, the aquastat won't let B1 or the burner start up above the high limit. If it does, you better change the aquastat.

Some problems with outfires are caused by not having a 40-50 degree difference between the high and low limit of the aquastat. We had our first outfire yesterday at efm. The boiler was lingering at the high limit all day and whether it didn't fire enough during the warm spell or whether the cold water returning to the boiler sent the temperature below the limit of the outfire control (L6006A), I don't know, but I came in and found an ash can full of raw coal yesterday morning. I can hardly imagine if the outfire control had not worked with a feed of 8 teeth for 12 hours! In our case, the heating pipes hold much more water than the boiler, so killing the boiler with cold water is a real concern if the circulator doesn't run for a long period of time.

I think your problem is directly related to the aquastat settings and not the coal. Our stoker is set at 150-200.

Your rite chris had a brain fade moment.

ry

Hey RY, it's winter, what are you doing with so much time at the computer?

stoker-man wrote:Hey RY, it's winter, what are you doing with so much time at the computer?

I have had my share of service calls already. This forum is very addicting. I am sure as it gets colder I will have less and less time. Have a good one.

ry

Its interesting the settings I am using now for the new coal is so much different from last year. Running with 4 clicks, 4 air, 2min 20 sec timer, 160L/200H, and its been lit for few days. I ran the whole last year with 3 clicks 3.25 air, 3min 30sec, 160L/200H. The old settings were running too hot even after reducing the timer time, and didn't want the pipe to melt.

Dave