chlop wrote:My DF520 usually goes out for a day or two when the temp is over 90 and the humidity is insufferable, so I expected a problem about a month ago during that hot spell. Well, the boiler went out at least three times since then. I adjusted the feed, the water temps, and the draft. I cleaned out the inside of the boiler and did a laundry list of other things. Right now, I have the water temps between 140 and 190 and the feed is at three clicks. The only other problem may be the coal----the ashes seem to be very heavy. If I can't maintain a fire now, I may trade in my Cadillac for a Pinto.
If you have an EFM 520 that experiences outfires, I recommend you reset everything to EFM's recommended settings and go from there. I have NEVER had an outfire using their recommended settings...but I have tried to outsmart the system a few times and experienced a few outfires.
Also, if you have poor draft, poor coal, or both...you will have problems with whatever coal burning appliance you are trying to use.
Baseline settings for a 520: 160 low, 200 high, 10 differential. 4 teeth feed, 4 air (or a touch more), 2 minutes every half hour on the timer. My boiler has been running all summer with those settings, trouble-free.