Harmon Stoker - Smoke Out the Back of the Coal Hopper

A Coal stoker furnace or stove controls most operations including automatically feeding the coal. They are quite similar to any conventional oil and gas units and easily operated for extended periods of time. They commonly use rice coal but may use larger sizes like buckwheat. They can be used as primary heat, supplementary heat or have a dual set up with your existing oil/gas furnace.
llama99
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Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 9:17 pm

As I posted earlier tonight, I pulled my stoker apart to fix a jammed push block. Put it all back together and fired it up. Now I have white smoke coming out the bottom of the hopper - coming out between the pusher motor cover and the hopper where the hopper fits into the back of the stove. Now, I did put some oil in the bearings and spilled some, but this is nowhere near the motor - smells like sulfur. CO monitor hit 30 so I shut it down.

What did I do wrong?


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coalkirk
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Posts: 4682
Joined: Wed. May. 17, 2006 8:12 pm
Stoker Coal Boiler: 1981 EFM DF520
Coal Size/Type: anthracite/rice coal
Location: Forest Hill MD

Post Wed. Jan. 30, 2013 9:21 pm

Probably burning oil from the spill. Does it smell like rotten agss or burning oil?
You have enemies? Good. That means you've stood up for something, sometime in your life. Winston Churchill

"I would rather have a German division in front of me than a French one behind me." —General George S. Patton

Burning rice coal in a 1981 EFM DF520, nut coal in a hand fired Jotul 507.

llama99
Member
Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 9:29 pm

coalkirk wrote:Probably burning oil from the spill. Does it smell like rotten agss or burning oil?
Smells like rotten eggs - sulfur. My first thought was oil because it was visible white smoke, but when the CO monitor hit 30 on the first floor - the stove is in the basement - I got worried.

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titleist1
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Posts: 4404
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite
Location: Cecil County, MD

Post Wed. Jan. 30, 2013 9:40 pm

if you pulled the stoker assembly off the back of the stove I would guess it is not seated correctly on the gasket when re-assembled.
I drive a VW TDI, heat my home & workshop with two coal stokers and have two vintage JD diesel tractors....
The EPA just loves me!!

llama99
Member
Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 9:46 pm

I didn't pull the assembly off the stove - I pulled the block out through the front of the stove, but I guess it still could have gotten moved. It seems to be coming out around the base of the hopper where it fits into the stoker unit.
Last edited by llama99 on Wed. Jan. 30, 2013 9:50 pm, edited 1 time in total.

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titleist1
Member
Posts: 4404
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite
Location: Cecil County, MD

Post Wed. Jan. 30, 2013 9:49 pm

did the baffle on the combustion fan get moved so that its more wide open than previously?
I drive a VW TDI, heat my home & workshop with two coal stokers and have two vintage JD diesel tractors....
The EPA just loves me!!

llama99
Member
Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 9:51 pm

titleist1 wrote:did the baffle on the combustion fan get moved so that its more wide open than previously?
Looks to be about the same....I'll double check. Nope hasn't moved.
Last edited by llama99 on Wed. Jan. 30, 2013 9:55 pm, edited 1 time in total.

User avatar
titleist1
Member
Posts: 4404
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite
Location: Cecil County, MD

Post Wed. Jan. 30, 2013 9:54 pm

did some of that pasty stuff clog the holes in the grates? is the fire burning further back on the grates than previously? obviously the combustion air/exhaust is finding it easier to exit through the coal feed path rather than the exhaust port.
I drive a VW TDI, heat my home & workshop with two coal stokers and have two vintage JD diesel tractors....
The EPA just loves me!!


llama99
Member
Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 9:58 pm

I did have to loosen the brace that holds the top of the hopper to get it off. Is there any adjustment in that brace?

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titleist1
Member
Posts: 4404
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite
Location: Cecil County, MD

Post Wed. Jan. 30, 2013 10:09 pm

if you mean that bracket with a lip that catches the top of the hopper, then no that should not have an effect on exhaust coming out the bottom where the hopper feeds the coal to the stove. You must have had the grate holder off to get the pusher block out, is it seated properly at the back and sitting flat on the stoker assembly?
I drive a VW TDI, heat my home & workshop with two coal stokers and have two vintage JD diesel tractors....
The EPA just loves me!!

llama99
Member
Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 10:10 pm

titleist1 wrote:did some of that pasty stuff clog the holes in the grates? is the fire burning further back on the grates than previously? obviously the combustion air/exhaust is finding it easier to exit through the coal feed path rather than the exhaust port.
I made sure the grates were clean and the space under the grates was clean too. I vacuumed the horizontal section of the pipe to the chimney (pipe is new).

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titleist1
Member
Posts: 4404
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite
Location: Cecil County, MD

Post Wed. Jan. 30, 2013 10:11 pm

also there should be a gasket between the grate holder and stoker assembly that it sits on, maybe that gasket is not sitting as it should.
I drive a VW TDI, heat my home & workshop with two coal stokers and have two vintage JD diesel tractors....
The EPA just loves me!!

llama99
Member
Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 10:13 pm

titleist1 wrote:if you mean that bracket with a lip that catches the top of the hopper, then no that should not have an effect on exhaust coming out the bottom where the hopper feeds the coal to the stove. You must have had the grate holder off to get the pusher block out, is it seated properly at the back and sitting flat on the stoker assembly?
I did not take the grate holder off. I unscrewed the threaded rod from the back of the push block. I was able to push the block over the grate holder without removing it.

User avatar
titleist1
Member
Posts: 4404
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite
Location: Cecil County, MD

Post Wed. Jan. 30, 2013 10:21 pm

how far back the grates was the fire burning? was it headed into the hopper? it doesn't sound like you moved anything that would change the combustion air flow path so the only thing I can think of is that you don't have it feeding new coal fast enough and the fire burns too far back the grates. how many dots are you pushing?

by the way, what draft is your flue pipe seeing and can you take a manometer reading on the firebox?
I drive a VW TDI, heat my home & workshop with two coal stokers and have two vintage JD diesel tractors....
The EPA just loves me!!

llama99
Member
Posts: 57
Joined: Sat. Dec. 01, 2012 8:19 am
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum Stoker
Location: New Tripoli Pa

Post Wed. Jan. 30, 2013 11:34 pm

titleist1 wrote:how far back the grates was the fire burning? was it headed into the hopper? it doesn't sound like you moved anything that would change the combustion air flow path so the only thing I can think of is that you don't have it feeding new coal fast enough and the fire burns too far back the grates. how many dots are you pushing?

by the way, what draft is your flue pipe seeing and can you take a manometer reading on the firebox?
I was pushing 3 dots. Fire was close to the front of the stove like 2" from the front...but it may have gone close to the back. It was hard to get it started, but then it really took off. I don't have a manometer and don't know what my draft was, but the barometric was open - the chimney liner is 51/2 inches. It usually has a good draw.


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