EFM 520

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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Rob R.
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Posts: 11354
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sat. Nov. 28, 2015 4:38 pm

Soft copper for the PRV downtube...fancy. 8-)

You can probably open that ball valve on the bypass without any ill effects.

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windyhill4.2
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Posts: 5020
Joined: Fri. Nov. 22, 2013 2:17 pm
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both
Location: Jonestown,Pa.17038

Post Sat. Nov. 28, 2015 4:54 pm

coal stoker wrote:Thanks Don,

Not sure what to do next, it was bitter sweet putting on the final panel.
It has been a lot of fun doing this build, and I am very glad that I chose to do the re-furb myself.
I now have an intimate understanding of how my 520 works, and also now the condition of all the parts involved.
Just have to figure out the next project now :D :D :D :D
CS
Watch all of StokerDon's projects for ideas.. :gee:
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vermontday
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Posts: 328
Joined: Wed. Oct. 22, 2008 8:27 pm
Stoker Coal Boiler: EFM 520
Location: Bennington, VT

Post Sat. Nov. 28, 2015 10:21 pm

Your rebuilt jacket looks like new.

Very nice install.
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coal stoker
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Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Sun. Nov. 29, 2015 1:13 pm

Rob,
I am seeing return temps with around 20 deg differential from the supply, will opening the valve on the bypass improve on this?
What will opening or closing the valve more help me gain?
My understanding was that a bypass loop helps to temper the return to the boiler, just trying to understand.
Thanks,

CS

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Rob R.
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Posts: 11354
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sun. Nov. 29, 2015 1:54 pm

20 degrees is about perfect. As long as the bypass pipe stays hot when everything is sitting idle, leave it alone.

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coal stoker
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Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Sun. Nov. 29, 2015 2:45 pm

Check and check.
I will leave it alone, thanks for the info.
CS

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coal stoker
Member
Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Wed. Dec. 30, 2015 4:53 pm

Hey guy's

I am looking wire up a L6006 aquastat to be used as an outfire control.
I have the aquastat but it is missing the clamp for the well.
Anyone have one they want to get rid of.

Thanks,
CS
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coal stoker
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Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Tue. Jan. 05, 2016 5:42 am

Woke up this morning to the EFM cycling on and off.
upon investigation I found that safety interlocks had worked and kept the auger temp from getting to high.
I moved the probe a little further down the tube and all is good.
I was seeing temps around 135 just outside the jacket.
Anyone else ever get temps that high.
CS

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Rob R.
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Posts: 11354
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Tue. Jan. 05, 2016 5:46 am

I have never checked the auger temperature on mine, never really found a need to monitor it.

I can hold my hand on it for about 1-2 seconds when it is running hard, but I am not sure what that equates to in degrees.

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coal stoker
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Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Tue. Jan. 05, 2016 7:07 am

That sounds about right, being I was able to do the same.
This is the first time it has had to run hard, so this is new territory for me.
And of course as soon as the safety kicked in the boiler started to get behind on the heat calls, but it seems to be catching up.
5 deg this morning. Brrr.
CS

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SMITTY
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Posts: 11915
Joined: Sun. Dec. 11, 2005 12:43 pm
Stoker Coal Boiler: Patriot Coal - (custom built by Jim Dorsey, Taunton MA - RIP 4/18/13)
Hand Fed Coal Stove: Harman Mark III (SOLD!)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler
Location: West-Central Mass

Post Tue. Jan. 05, 2016 8:50 am

coal stoker wrote:...

........

I also have a problem, I am trying to figure out why my DHW temp is through the roof.
It is like the aquastat on the indirect has no effect,
Then it dawned on me, I think that the circulator I have between the boilers is forcing in past the DHW circulator and pushing the DHW to my high limit setting.
Any thoughts?
I am no expert but this makes sense to me.
Just need some help before someone gets hurt.
I also lowered the 3 speed to the lowest setting, hoping this will help with forcing past the DHW zone circulator.
Thanks in advance,
CS
This happens with my indirect too, unless there is a constant call for heat (like today - in the single digits outside). I replaced the internal flow-check in the Taco circulator, but that's not enough to hold back the stoker's Taco circulator - it just forces the water right past on warmer days, and DHW temp will be whatever boiler temp is. Over 150° sometimes.

I've got used to it. The fact that this ghost-flow stops on a high heat demand actually works out better for me. Our house is poorly insulated, so the baseboard heaters need all the help they can get.
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coal stoker
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Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Tue. Jan. 05, 2016 9:02 am

I actually ended up keeping my diverter valve that is in my supply and return loop partially open.
This allowed the circulator to flow in and out of the boiler without pushing past the DHW circulator, it has worked well so far.
CS

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coal stoker
Member
Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Wed. May. 18, 2016 5:44 pm

Just checking in,
Sitting here thinking that putting in this boiler is better than I had ever imagined, here we are in the middle of May and I still about 2 plus tons left and I am still burning.
I called Lehigh yesterday and found out that there 20 plus ton summer price is $135.
I am lining up a Tri-axle for a 22 ton delivery, that should be 2 years of peace of mind.
Oh by the way did I mention I love love love this boiler it is awesome!!!!!!!!
:D :D :D :D :D
Great summer to all
CS

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StokerDon
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Joined: Mon. Nov. 11, 2013 11:17 am
Stoker Coal Boiler: BairMatic BMC-500 with Van Wert VA400 Stoker, Gentleman Janitor GJ-671/EFM S-15 stoker, Van Wert VA-600
Hand Fed Coal Furnace: Harman SF3500
Coal Size/Type: Rice and Chestnut
Other Heating: Noth'in but COAL! Well, Maybe a little tiny bit of wood
Location: PA, Southern York County!

Post Thu. May. 19, 2016 10:21 pm

Glad to hear you're having a good time with your boiler. These under-fed stoker boilers are awesome!!!

Wow, $135 a ton for rice is a real good price!

Happy hot water!

-Don
There are few problems in life that cannot be solved by lighting something on fire.

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coal stoker
Member
Posts: 346
Joined: Tue. Feb. 17, 2015 5:07 pm
Stoker Coal Boiler: 1986 EFM DF520
Coal Size/Type: Rice/Anthracite
Other Heating: oil fired boiler

Post Sat. May. 21, 2016 6:45 am

Yeah!!!!!!

Indeed Happy Hot Water
CS

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