How to dump heat with df 520

Re: How to dump heat with df 520

PostBy: Wood'nCoal On: Wed Dec 21, 2011 6:52 pm

No problem!
In addition to checking the draft reading and pulling the fines lever I also check the feed tube near the boiler, at the most it has been moderately warm. Here's my settings:
Air at 5, feed at 3 teeth. Aquastat 210 High/170 Low-15 degree differential. Draft under a full fire runs at -.05" WC. I also have a low temperature cutoff installed that's set at 150 in the event of an outfire, it will stop the stoker from filling the entire ash pan and burn chamber with coal if I'm not around. With the draft problems I have in the hot weather I had several outfires, the cutoff saved me a lot of grief (except for the time I forgot to shut the bypass switch off after relighting the boiler and letting it get up to temperature).
Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: How to dump heat with df 520

PostBy: Rob R. On: Wed Dec 21, 2011 7:06 pm

Mark (PA) wrote:You HAVE to adjust your Air up some if the feed tube is too hot to touch.


I think you meant the feed, not the air. Too much air will cause the fire to burn low in the pot, and possibly into the tube. I ran my 520 on 3 teeth with rice for several months, I could easily hold my hand on the auger tube right next to the base. If yours is too hot to touch on 3 teeth, I would definitely run it at 4 teeth & 4 air (assuming you are burning rice coal).

I maintain that the easiest thing to try is reducing the length of the timer cycle.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: How to dump heat with df 520

PostBy: Wood'nCoal On: Wed Dec 21, 2011 7:12 pm

My timer settings are high due to the draft issue I have. My chimney is fieldstone and massive, on warm days after a cold night the stone holds the cold and the boiler looses draft. In cold winter weather the chimney drafts extremely well.
Typically timer settings are half of the settings I'm currently using, 2 minutes an hour usually.
Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: How to dump heat with df 520

PostBy: Mark (PA) On: Wed Dec 21, 2011 8:29 pm

Yes on the Feed! Thanks Rob...
:oops:
Sorry Card! Thats what happens when you are in a rush I suppose.
Mark (PA)
 
Stove/Furnace Make: 1953 EFM SF-520 High Boy
Stove/Furnace Model: Fitzgibbon Boiler

Re: How to dump heat with df 520

PostBy: cardinal On: Wed Dec 21, 2011 8:57 pm

draft readings.
neg.02 at fire door neg.04 at stack . Thanks for all your help I'm going with 4 feed and 4 air and setting back timer . If this doesn’t work maybe I should add room on home and start a laundrymat business and go with 6 teeth. Thanks everyone for your help and be safe
cardinal
 
Stoker Coal Boiler: EFM 520
Coal Size/Type: Rice

Re: How to dump heat with df 520

PostBy: cardinal On: Sat Dec 24, 2011 12:18 pm

Went with 4 teeth 4 air timer set 1.5 min every half hour, Temp in plex tubing 120, stoker runs 3 hours same amount of time as with 3 teeth 3-1/4 air to heat concrete slap up to temp. All your help corrected the high limit with timer settings ,so no need for dump zone thanks. My concern now is the heat in the feed tube. At 4 or3 teeth same results first 6 inches from boiler tube is hot to touch could only put hand on feed tube momentarily (1 second) (6 to 12 inches from boiler I could rest hand 3-4 seconds, after that is all cool from coupling to 55 gal barrel holding the coal, is this normal ? I think its just getting hot from the boiler heat . On short runs it only gets warm the first 3 inches. After looking at the picture of melted feed tube that stoker man poster. I want to be sure this is not happening Thanks
cardinal
 
Stoker Coal Boiler: EFM 520
Coal Size/Type: Rice

Re: How to dump heat with df 520

PostBy: Rob R. On: Sat Dec 24, 2011 12:37 pm

Rob R. wrote:I maintain that the easiest thing to try is reducing the length of the timer cycle.


cardinal wrote:All your help corrected the high limit with timer settings ,so no need for dump zone thanks.


Excellent.

cardinal wrote:My concern now is the heat in the feed tube. At 4 or3 teeth same results first 6 inches from boiler tube is hot to touch could only put hand on feed tube momentarily (1 second) (6 to 12 inches from boiler I could rest hand 3-4 seconds, after that is all cool from coupling to 55 gal barrel holding the coal, is this normal ?


If the boiler has been running continuously for a few hours, there will be some heat radiating down the auger tube. If during a 20-30 minute run the auger tube stays cool/warm to the touch, I don't think you have anything to worry about.

cardinal wrote:I think its just getting hot from the boiler heat .


Probably. What are you burning for coal?
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: How to dump heat with df 520

PostBy: Scottscoaled On: Sat Dec 24, 2011 1:22 pm

Look at your fire. If it is burning small and down into the pot, then you should back off the air a little. I seem to get better heat if I can get the fire to go just as big as the brn grates with a complete burn. ;)
Scottscoaled
 
Stoker Coal Boiler: EFM 520x4, 700. Van Wert 1200.
Hot Air Coal Stoker Furnace: EFM 150, Keystoker 150
Coal Size/Type: Lots of buck

Re: How to dump heat with df 520

PostBy: cardinal On: Sat Dec 24, 2011 1:46 pm

Burning Rice Thanks again
cardinal
 
Stoker Coal Boiler: EFM 520
Coal Size/Type: Rice