Lighting nut coal

Re: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 9:29 am

Bear038 wrote:



I notice his grates go in 2 directions, mine tilt forward and back to level, not back from level as well.


It sounds like your grates are working as designed by harman.


Yep, that was back in the good old days! Back again folks, with an even bigger problem than lighting coal! Yes, I think the Harman is flat out busted. After 2 days of an aching left elbow, as the shaker arm locks before it brings the grates even and I've tried the manual fix, last night that got the best of things. I had been burning too much coal in last 2 days, way too much rock in ash pan, and last night's shake just dumped and jammed everything with hot coal. I let it die out until today, figuring a piece of stray firebrick or something under the rocker gears. Today it's all cleaned out, nothing in the way anywhere, and it still locks up empty. You can see in pics below how the back grate stays cocked open, and on the side shot hot the arm won't return to even. Is this common with the Harman? Any ideas to fix it? Does Harman even have service people to fix it? Do these arms intentionally lock when they know it's going to 6 degrees soon? (like now) It's basically rendered the thing useless as I'm dumping coal and shake out is ridiculous, so any advice would be dandy!

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coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

Re: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 10:17 am

Never mind. I called a dealer and he knew right away. Warped grates. Seemingly if they get too hot they warp and this happens. 180 bucks a grate to fix it. So not only is coal 125 a month more than wood to heat the place, which due to ease I was begrudgingly ok with, but it ruins the stove if it gets too hot leaving you without a heating unit!! Fabulous! :?
Last edited by coldcoal on Mon Jan 24, 2011 10:30 am, edited 1 time in total.
coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

Re: Lighting nut coal

PostBy: Poconoeagle On: Mon Jan 24, 2011 10:24 am

Keeping the ashes up close to the grate could be a reason for overheating also. ??
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

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Re: Lighting nut coal

PostBy: titleist1 On: Mon Jan 24, 2011 10:28 am

Yes, if you burn too hot a wood fire in it or too hot a coal fire, the grates may warp. Since you have over fired your stove you should also check the baffle that is above the firebox to see if it is warped as well. If the baffle plate warps badly enough it can damage the sides of the stove.

Do you have any idea of the temps you were running your stove, I routinely run close to 600* and in 20 years have never warped a grate? What draft were you pulling through it, do you have a manometer?
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: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 10:29 am

Yeah he said that Pocono, but I keep it cleaned out. He said more likely if a fire is revived and let go to long. Sounds like these are pretty sensitive little stoves if they are made for coal... but a mere 1200 degrees warps the grates the coals sit on. Red coals come pretty close to that all by themselves.

Titles, I run it a 500-550, never even 600.

So now what? Run it with the warped grates anyway and shake really carefully? Stay 1/2 frozen with radiators that are a joke in this cold? I think I go for option A.
Last edited by coldcoal on Mon Jan 24, 2011 10:32 am, edited 1 time in total.
coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

Re: Lighting nut coal

PostBy: coalkirk On: Mon Jan 24, 2011 10:31 am

Well it can happen but I'd have to say it was overfired and ashes allowed to accumulate. Leaving the ash door open could do it. Those grates are really stout and last many years if the stove is properly burned.
coalkirk
 
Stoker Coal Boiler: Harman VF3000
Coal Size/Type: antrhcite/rice coal

Re: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 10:34 am

coalkirk wrote:Well it can happen but I'd have to say it was overfired and ashes allowed to accumulate. Leaving the ash door open could do it. Those grates are really stout and last many years if the stove is properly burned.


Over fired, well possible as I leave ash door open to catch coals, so I'm probably doing that wrong. Ashes are cleaned out 2x a day though, always clear.
Last edited by coldcoal on Mon Jan 24, 2011 10:34 am, edited 1 time in total.
coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

Re: Lighting nut coal

PostBy: CapeCoaler On: Mon Jan 24, 2011 10:34 am

The linkage that connects the grates is subject to wear and corrosion...
The grates should be flat, not sagging...
Pop them out and check on a straightedge...
If they are sagging, the stove has been run with an over-full ashpan, this blocked the air from underneath that cools the grates as it feeds oxygen to the fire...
Check the online vendors parts are less...
Others will chime in on parts prices...
CapeCoaler
 
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove

Re: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 10:36 am

CapeCoaler wrote:The linkage that connects the grates is subject to wear and corrosion...
The grates should be flat, not sagging...
Pop them out and check on a straightedge...
If they are sagging, the stove has been run with an over-full ashpan, this blocked the air from underneath that cools the grates as it feeds oxygen to the fire...
Check the online vendors parts are less...
Others will chime in on parts prices...


You can see in the pic they sag, yes? All 3 have same sag, but the back one is hitting back of stove.
Last edited by coldcoal on Mon Jan 24, 2011 10:37 am, edited 1 time in total.
coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

Re: Lighting nut coal

PostBy: Poconoeagle On: Mon Jan 24, 2011 10:36 am

burn it and warm up 1/2 way :)

aquire new grates and carry on. lessons learned.... we all have them ;)
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

Re: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 10:39 am

Poconoeagle wrote:burn it and warm up 1/2 way :)

aquire new grates and carry on. lessons learned.... we all have them ;)


Yeah whats happening though, as I saw last 2 days, is the back won't redden up. Surely due to hot fire dropping through the space. So all in all the stove is useless until I get the cash to fix it. That'll be spring time, so then I won't care anymore anyways.
coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

Re: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 10:46 am

CapeCoaler wrote:The grates should be flat, not sagging...
Pop them out and check on a straightedge...


Correction, The front grate is straight, the mid and back sag, no straight edge needed to see this. How would one pop them out? Remove all bricks? I dunno, I'm too cold to deal with it, lol. This is the first time I heard about the grates warping or keeping the coal cool enough at grate level. I read here the firebox can warp if not for the bricks, but the grates is news.
coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

Re: Lighting nut coal

PostBy: Chuck_Steak On: Mon Jan 24, 2011 11:20 am

There was obviously some ort of "issue" that warped it, like ash build up
or something.... Just a really hot stove wouldn't warp a grate.
I've seen a Mark III at 900, and the grates stayed true....

Dan
Chuck_Steak
 
Coal Size/Type: mostly nut, sometimes stove, Santa brand
Stove/Furnace Make: Harman
Stove/Furnace Model: Mark III

Re: Lighting nut coal

PostBy: mason coal burner On: Mon Jan 24, 2011 12:52 pm

put up a post for used grates . look on craigslist . burn wood til you can fix it . see what it would cost to have some cast .
mason coal burner
 
Stove/Furnace Make: hitzer/glenwood
Stove/Furnace Model: 82/111

Re: Lighting nut coal

PostBy: coldcoal On: Mon Jan 24, 2011 1:41 pm

Yeah my chimney sweep said he noticed some warp in em a couple months ago. He said when they get old the metal just gives up, and the hotter coal did em in. So the issue is seemingly that the stove is 30 years old, not that anyone knows that for sure as there's no plate on it.

Yeah I'd burn wood but that's not an option now, ain't got any, nor is starting my coal as all wood I'd use to start it is snow covered. (Downed trees by a creek that can't be reached down snowy hill in a foot of snow drifts) I just went out to look, no way I can get to it and it's all frozen and wet anyway. So Friday I'll get some fire starters and a pack of hardwood at the grocer and burn... something!

Gonna be a hellova-week!
coldcoal
 
Stove/Furnace Make: harman
Stove/Furnace Model: 3 warped grated useless beast

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