MKII Limits

Re: MKII Limits

PostBy: franco b On: Sat Dec 14, 2013 9:51 pm

Gekko wrote:So increase the exhaust draft?

I've had the side temps @ 625 with exhaust flange temps @ 400.

Harman says it's over firing @ 500 measured at the exhaust flange or before the baro.

That's my point, is this thing flat out?


Is that with the blower on? Also it would be expected to have higher stack temp. when burning off volatiles after re loading but not after that with a settled fire.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: MKII Limits

PostBy: scalabro On: Sat Dec 14, 2013 9:54 pm

franco b wrote:
Gekko wrote:So increase the exhaust draft?

I've had the side temps @ 625 with exhaust flange temps @ 400.

Harman says it's over firing @ 500 measured at the exhaust flange or before the baro.

That's my point, is this thing flat out?


Is that with the blower on? Also it would be expected to have higher stack temp. when burning off volatiles after re loading but not after that with a settled fire.


Yes that's with the fan on.

The surface temps will go higher with it off.

I think I'm answering my own question ... I need, well, I want more stove, LOL!
scalabro
 
Baseburners & Antiques: Crawford 40, PP Stewart No. 14 in the works.
Coal Size/Type: Stove, Anthracite
Other Heating: Oil fired forced hot air

Re: MKII Limits

PostBy: michaelanthony On: Sat Dec 14, 2013 9:58 pm

Hi Gekko, my box stove similar to your Harman never had the high temp as you at the breech, it is normally in the 220, 260 range and even then I thought it was high so I installed a mpd about a foot away from the back of the stove and a foot and a half before the baro. This set up slowed the gases and dropped the temp of the pipe before the baro to approx. 160 and 100 to 120 after therefore keeping more heat in the basement. I am getting slightly longer burn time on a bag of coal of a few hours and that adds up to less coal per 24 hours. Have you checked your gaskets this year?
michaelanthony
 
Hand Fed Coal Stove: Vigilant 2310, gold marc box, vogelzang pot belly coat rack
Coal Size/Type: Pea, and a little nut
Other Heating: Very cold FHA oil furnace

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Re: MKII Limits

PostBy: scalabro On: Sat Dec 14, 2013 10:05 pm

Not with a dollar bill.

Just did a smoke test with my cigar, all good no air infiltration.
Last edited by scalabro on Sat Dec 14, 2013 10:06 pm, edited 1 time in total.
scalabro
 
Baseburners & Antiques: Crawford 40, PP Stewart No. 14 in the works.
Coal Size/Type: Stove, Anthracite
Other Heating: Oil fired forced hot air

Re: MKII Limits

PostBy: franco b On: Sat Dec 14, 2013 10:05 pm

Try lowering the draft to .03 before the baro. your draft at .08 after the baro is very high. That high draft will pull more air than is needed through the secondary air slots and raise stack temp.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: MKII Limits

PostBy: scalabro On: Sat Dec 14, 2013 10:09 pm

franco b wrote:Try lowering the draft to .03 before the baro. your draft at .08 after the baro is very high. That high draft will pull more air than is needed through the secondary air slots and raise stack temp.



I'll do that tomorrow, don't want to experiment with draft tonight before bed!

Perhaps an MPD before the baro?

Thanks for all the suggestions guy's.

This is a great place to hang out!
scalabro
 
Baseburners & Antiques: Crawford 40, PP Stewart No. 14 in the works.
Coal Size/Type: Stove, Anthracite
Other Heating: Oil fired forced hot air

Re: MKII Limits

PostBy: rberq On: Sat Dec 14, 2013 10:14 pm

Gekko wrote:I think I'm answering my own question ... I need, well, I want more stove, LOL!

Yes, it sounds like the Mark II is maxed out or close to it, and you need (as well as want :) ) more stove. You could get a little more heat out of it, but who wants to be straining yourself and the stove to run at max all the time?
rberq
 
Hand Fed Coal Stove: DS Machine 1300
Coal Size/Type: Nut -- Kimmel/Blaschak/Reading
Other Heating: Oil hot water radiators, propane

Re: MKII Limits

PostBy: Lightning On: Sat Dec 14, 2013 10:15 pm

franco b wrote:Try lowering the draft to .03 before the baro. your draft at .08 after the baro is very high. That high draft will pull more air than is needed through the secondary air slots and raise stack temp.


I don't understand how you are seeing these pressures. Could someone please explain? What is meant by before and after baro?
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: MKII Limits

PostBy: franco b On: Sat Dec 14, 2013 10:22 pm

Lightning wrote:
franco b wrote:Try lowering the draft to .03 before the baro. your draft at .08 after the baro is very high. That high draft will pull more air than is needed through the secondary air slots and raise stack temp.


I don't understand how you are seeing these pressures. Could someone please explain? What is meant by before and after baro?

Before baro is between the stove and baro and after baro is between the baro and chimney, if I understand it correctly.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: MKII Limits

PostBy: scalabro On: Sat Dec 14, 2013 10:24 pm

franco b wrote:Try lowering the draft to .03 before the baro. your draft at .08 after the baro is very high. That high draft will pull more air than is needed through the secondary air slots and raise stack temp.


Sorry for any confusion, I made a typo in my Posting my drafts are .05 before the baro and .08 after.

Harman recommends a minimum of .06 .

On a dry day below 0 deg my chimney will easily draw over 1.4
scalabro
 
Baseburners & Antiques: Crawford 40, PP Stewart No. 14 in the works.
Coal Size/Type: Stove, Anthracite
Other Heating: Oil fired forced hot air

Re: MKII Limits

PostBy: Wood'nCoal On: Sat Dec 14, 2013 10:30 pm

I think you can open up the under fire air a little more and try to get the draft in the pipe before the baro a little closer to -.04" WC. , that's about it.
Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: MKII Limits

PostBy: franco b On: Sat Dec 14, 2013 10:34 pm

Gekko wrote:
franco b wrote:Try lowering the draft to .03 before the baro. your draft at .08 after the baro is very high. That high draft will pull more air than is needed through the secondary air slots and raise stack temp.


Sorry for any confusion, I made a typo in my Posting my drafts are .05 before the baro and .08 after.

Harman recommends a minimum of .06 .

On a dry day below 0 deg my chimney will easily draw over 1.4

You might read the posts by King coal who had a similar problem with his DS Machine stove and wound up using both a baro and manual damper.
I read the baro numbers just as you intended. I did not notice you left out the zeros.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: MKII Limits

PostBy: Lightning On: Sat Dec 14, 2013 10:44 pm

franco b wrote:Before baro is between the stove and baro and after baro is between the baro and chimney, if I understand it correctly.


I've taken measurements before and after baro and they were always the same. :? :lol:
And why would a measurement after the baro be meaningful if it was different??

Are you sure he doesn't mean a MPD?? This would show different pressure on each side..
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: MKII Limits

PostBy: Wood'nCoal On: Sat Dec 14, 2013 10:49 pm

They should be, unless that high reading was due to turbulence around where the test point is (after the baro).
Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: MKII Limits

PostBy: Lightning On: Sat Dec 14, 2013 10:51 pm

He must be mistaken a MPD for a baro... :?
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

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