Water Temp

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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dan75
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Joined: Sun. Jan. 11, 2009 1:33 am
Stove/Furnace Make: efm
Stove/Furnace Model: df520

Post Sun. Jan. 11, 2009 1:42 am

I have a efm coal stoker and I;m starting to notice that sometimes usually in the morning the temp goes anywhere from 220 to 250. I have it set to go on at 180 an off at about 195. I watch it during the day when I'm around and it seems to be working perfect, just seems to happen over nite. any answers?

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franpipeman
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Stoker Coal Boiler: efm 520 stoker fitzgibbons pressure vessel
Hand Fed Coal Stove: harman, russo
Coal Size/Type: rice
Other Heating: alpine propane condensing boiler radiant floor
Location: Wernersville pa

Post Sun. Jan. 11, 2009 8:32 am

is the location of the operating control at a significantly different location then your thermometer.?

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stoker-man
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Posts: 2063
Joined: Mon. Nov. 19, 2007 9:33 pm
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Sun. Jan. 11, 2009 1:46 pm

Are you using both returns in the bottom of the boiler?

Reasons for Using Both Return Lines and Bypass Line

Your boiler should stop maintenance stoking whenever it reaches 180 or when the thermostat setting is reached, and then it might climb another 30-40 degrees. If you leave your high limit at 195, and the water temperature is above that, the stoker motor will not come on until the temperature is below 195 which will result in outfires in the warmer months.
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coalmeister
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Stove/Furnace Make: Alaska 140 Furnace -sold
Stove/Furnace Model: Harmon VF3000 -sold
Location: Between Rochester & Buffalo NY

Post Sun. Jan. 11, 2009 1:48 pm

Do you turn back the thermostat in the house at night ? Maybe long idle overshoot? (I'm no expert)

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e.alleg
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Stove/Furnace Make: EFM
Stove/Furnace Model: 520
Location: western ny

Post Sun. Jan. 11, 2009 8:49 pm

readjust your aquatsat: set the high limit to 180, set the low to 130, differential to 15 and see how it goes. What happens is the boiler is stoking coal into the pot full blast up to 195 degrees when it shuts off, then it simmers in there at night when nobody is using hot water or opening the front door and can shoot up quite a bit. Make sure you don't have the high and low too close together or you will pull your hair out trying to figure it out. 130/180 should be just about perfect.
Burning coal is definitely worth the extra work involved.
"Good enough" is not good enough.

sootman
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Stove/Furnace Make: 1953 efm 520 high boy
Stove/Furnace Model: Harman mag
Location: Cooperstown NY

Post Tue. Jan. 20, 2009 4:59 pm

Do you have a draft regulator?

Glenn

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kevin12973
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Stove/Furnace Make: EFM
Stove/Furnace Model: 1956 SF-520 hot water
Location: albany NY

Post Tue. Jan. 20, 2009 7:10 pm

Do you have your thermostat wired to turn the stoker on when it calls for heat. I did at first and over fired so I disconnected the TT inside the aquastat and let it run on boiler demand alone. What was happening was the boiler would get to temp and then A zone would call for heat and raise the temp more and more. Has no problem maintaining temp like this, much better without thermostat turning on stoker ;)

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Pa Dealer
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Posts: 244
Joined: Fri. Aug. 15, 2008 10:12 am
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker
Location: NEPA

Post Tue. Jan. 20, 2009 7:22 pm

kevin12973 wrote:Do you have your thermostat wired to turn the stoker on when it calls for heat. I did at first and over fired so I disconnected the TT inside the aquastat and let it run on boiler demand alone. What was happening was the boiler would get to temp and then A zone would call for heat and raise the temp more and more. Has no problem maintaining temp like this, much better without thermostat turning on stoker ;)
Thats all well and good to do it that way if you are returning a low volume of water from your heating units,but if you have castiron radiators that return a lot of water back to the boiler, its better to have the boiler start stoking so it can keep up in stead of trying to recover from a lower boiler temp.

RY

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kevin12973
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Stove/Furnace Make: EFM
Stove/Furnace Model: 1956 SF-520 hot water
Location: albany NY

Post Tue. Jan. 20, 2009 7:39 pm

Yea, no cast iron rads here so I am not familure with that configuraton. I do have alot of radiant heat that runs 130 going in, don't know how cold it is going back. Im sure not as relevent as cast rads. I do wish I had a few in a few locations around the house. Scraped a bunch about 10 years ago :mad: Mabey Just turn down the high to 190 and run in the160 to 175 range. Thats been working for me.

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