Flame Size

Flame Size

PostBy: n0useforaname On: Thu Feb 06, 2014 3:33 pm

Just curious... how big of a fire do most of you run in your stokers? Mine normally stays at about half inch to 1 1/2 inches max... but I had someone tell me theirs runs 3 inches and flames shooting everywhere most of the time. Just curious as to what the "norm" is.. or average between most users on here. Even saw some people say red coals were falling off the sides.. I'm just not sure how that could happen unless people burn their super hot.
n0useforaname
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Super Mag Stoker

Re: Flame Size

PostBy: EarthWindandFire On: Thu Feb 06, 2014 4:09 pm

My quick answer is that you need a new combustion blower.
EarthWindandFire
 
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Hand Fed Coal Stove: Hitzer model 75.
Other Heating: Oil and Natural Gas.

Re: Flame Size

PostBy: titleist1 On: Thu Feb 06, 2014 4:41 pm

Here is a pic of mine after running full burn for about an hour after the thermostat started calling for heat....the burning coal is about an inch from the end of the grate. Obviously a fire in idle mode would be much smaller.

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titleist1
 
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

Visit Lehigh Anthracite

Re: Flame Size

PostBy: n0useforaname On: Thu Feb 06, 2014 5:10 pm

EarthWindandFire wrote:My quick answer is that you need a new combustion blower.


Oh, I don't think there is anything wrong with mine, my Stoker is only 6 days old. I keep my furnace at idle basically and right now it's heating my upstairs to a perfect 72 degrees. I've had it cranked up just to try it out, and it's pretty furious.. looks like someone is having a fire fight in the box and the house gets 80 degrees. I was just curious as to what others are doing.
n0useforaname
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Super Mag Stoker

Re: Flame Size

PostBy: coaledsweat On: Thu Feb 06, 2014 6:48 pm

EarthWindandFire wrote:My quick answer is that you need a new combustion blower.

If it is a squirrel cage blower it can lose more than half its flow rate if the cupped blades are dirty. They need to be cleaned often as they pick up and hold onto pet hair, dust, ash and anything else they want.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Flame Size

PostBy: n0useforaname On: Thu Feb 06, 2014 8:00 pm

And does everyone else have a movable metal plate on their combustion blower? If so, what is it set at? Mine is set 3/4 of the way open
n0useforaname
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Super Mag Stoker

Re: Flame Size

PostBy: titleist1 On: Thu Feb 06, 2014 8:19 pm

Mine is maybe 1/3 open, the fan is rated at 75cfm.
titleist1
 
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

Re: Flame Size

PostBy: n0useforaname On: Fri Feb 07, 2014 9:23 am

titleist1 wrote:Mine is maybe 1/3 open, the fan is rated at 75cfm.


The guy at the furnace place told me to leave it 3/4 of the way open.. which I am , but sometimes I wonder if I should at least close it to half way. I've never had a stoker furnace before so I'm not sure how high the flames should be on the "norm".. When it sits at low/idle, it's a nice little blue flame off the top and a small strip of red coals.. when it kicks up a bit to get temp up, the coals don't get much bigger, but blue/yellow flames will reach the ^ area and come out around it a bit. This may be normal, but I dunno.. I hand fired a Mark II for years, and rarely saw flames ever.
n0useforaname
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Super Mag Stoker

Re: Flame Size

PostBy: titleist1 On: Fri Feb 07, 2014 11:08 am

3/4 open may be correct, or may not be correct! The guy at the furnace place should really have told you to get a manometer and watch the over fire reading versus the flue pipe reading and open the restrictor plate to the proper setting so that you don't pressurize the firebox. If you push in more air via the combustion fan than the flue pipe can exhaust, then you pressurize the firebox and exhaust gas will find its way out through other openings, like the hopper.

By the way, if you woulda stuck a fan in the open ash pan door on that Mark II I bet you woulda got to see some flames!! :D
titleist1
 
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

Re: Flame Size

PostBy: n0useforaname On: Fri Feb 07, 2014 11:19 am

titleist1 wrote:3/4 open may be correct, or may not be correct! The guy at the furnace place should really have told you to get a manometer and watch the over fire reading versus the flue pipe reading and open the restrictor plate to the proper setting so that you don't pressurize the firebox. If you push in more air via the combustion fan than the flue pipe can exhaust, then you pressurize the firebox and exhaust gas will find its way out through other openings, like the hopper.

By the way, if you woulda stuck a fan in the open ash pan door on that Mark II I bet you woulda got to see some flames!! :D


Yeah, I actually have a menometer, but I need to find the proper metal taps so the plastic does not melt. I also have a port in the front of my Harman to measure the draft in the box itself, but the stupid manual/etc.. does not say what size it is... and I live 45 minutes away from any store, so I'd prefer to know before I buy. I think Harman recommends a reading of .03 to .04 on the firebox and .06 on the draft. Either way I have Co detectors and they are all at zero, so it has to be doing decent.
n0useforaname
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Super Mag Stoker

Re: Flame Size

PostBy: titleist1 On: Fri Feb 07, 2014 11:40 am

Good job having the manometer on hand!! I used some extra copper tubing from a kit for running a water line to a freezer that I had left over. i think it is 3/16" or 1/4". a compression union transitions to the plastic tubing. The fitting on the flue pipe has threads on one side screwed into the pipe and compression on the other side for the tubing. I don't remember the size of that allen bolt on the front of the Harman, but the tubing slid into it on mine.

Keeping the CO monitors at 0 is a good thing!! ;)
titleist1
 
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

Re: Flame Size

PostBy: n0useforaname On: Fri Feb 07, 2014 11:55 am

titleist1 wrote:Good job having the manometer on hand!! I used some extra copper tubing from a kit for running a water line to a freezer that I had left over. i think it is 3/16" or 1/4". a compression union transitions to the plastic tubing. The fitting on the flue pipe has threads on one side screwed into the pipe and compression on the other side for the tubing. I don't remember the size of that allen bolt on the front of the Harman, but the tubing slid into it on mine.

Keeping the CO monitors at 0 is a good thing!! ;)


Oh dang... I didn't even think about just sliding the tubing in there for a minute or so.. because once I get the correct reading on the Menometer, I can just slip it back out. Good call :) And when checking the flue, I was just gonna do that real quick, but I need to get a decent sized plug to fill the hole. My flue pipe is literally a 20 foot straight up 6" pipe that goes right out of the roof.. and when we were installing it, it was sucking the air pretty good... and I live on the top of a mountain so the wind always gives me a good draft.
n0useforaname
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Super Mag Stoker

Re: Flame Size

PostBy: SpurHntr On: Fri Feb 07, 2014 9:00 pm

n0useforaname wrote:And does everyone else have a movable metal plate on their combustion blower? If so, what is it set at? Mine is set 3/4 of the way open


Mine is about 1/3 open
And here is my usual flame idling...when calling for heat it's about double this, filling up that space below the steel triangle above.
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SpurHntr
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Super Magnum Stoker

Re: Flame Size

PostBy: Rob R. On: Fri Feb 07, 2014 10:20 pm

At maximum burn I would expect the flames to hit or nearly hit the top of the firebox.

Here is a picture of my EFM burning buck, stoker had only been running a few minutes but you get the idea.
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Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Flame Size

PostBy: titleist1 On: Sat Feb 08, 2014 8:32 am

n0useforaname wrote: when checking the flue, I was just gonna do that real quick, but I need to get a decent sized plug to fill the hole.


I leave the manometer in the flue pipe all the time. It helps me to glance at it all the time and I'll notice if it is running lower than normal and know to check for fly ash in flue pipe. Between that and noticing the temps and the difference between flue pipe and stove I can tell if the stoker is running normal.
titleist1
 
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

Visit Lehigh Anthracite