Harman Mark II How Many Turns Open?

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BWood
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Post by BWood » Mon. Jan. 10, 2011 9:53 pm

Hey Folks,
I have been running a Harman Mark II for about 6 years, I have always run the main air control on the lower ash door at 1 full turn open to 1 1/4 open. Most importantly not sure if I am maximizing the burn, it'll run 12hrs between loads (Perfect). Because every chimney is a little different in draft. Any chance someone running one can put a stove pipe thermometer on the center of the top of their Harman Mark II and let me know what they are running at for temp?

Just looking for a redneck calibration in my new home, Perfect stove brought it with me from the old house.
Thanks
BDW

 
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SMITTY
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Stoker Coal Boiler: EFM 520 Highboy
Coal Size/Type: Rice / Blaschak anthracite
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Post by SMITTY » Mon. Jan. 10, 2011 10:31 pm

I've got a Mark III, which is a little bigger than the Mark II .... so you should get away with less turns out of the dial than I will ...

When I have it 2.5 turns out, the top can get up to 500°, & the stack temp can get to 400° without the blower running. With it running, it's around the upper 300 range, to around 400° with a stack temp of 275° or so. This is pulling a .04" draft, to a max of .06" intermittently.

 
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Chuck_Steak
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Coal Size/Type: mostly nut, sometimes stove, Santa brand

Post by Chuck_Steak » Tue. Jan. 11, 2011 8:41 am

I have a Mark III as well, but they are similar.
I just measured mine, have not touched it for almost 11 hours,
so I checked before I did anything to it.. (with an infrared)
I also use the left side of the stove, around 8" down, center,
not the top for my measurements generally,
as the top is "insulated" by the internal baffling.
top 330
side 425
pipe (12" from back of stove) 195
vent opened 1-1/8 turn
.05 draft
This is with stove coal.
it's 11 outside.
Usually, the stove side is around 525-550
and the pipe is around 220 with nut coal. vent opened around 1-3/4
I just wanted to experiment with the stove coal last night.
Could have opened it up a little more.
It's a little chilly in here this morning, around 67.

Dan

 
cowentz
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Post by cowentz » Tue. Jan. 11, 2011 10:52 am

I have been running my Mark II lately at 1 1/4 turns. Temp measured on side of stove near top is around 400. Draft .05. 12 - 13 hours between shaking / filling. I use a full coal hod of nut coal morning and night.


 
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jpete
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Hand Fed Coal Stove: Harman Mk II
Coal Size/Type: Stove, Nut, Pea
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Post by jpete » Tue. Jan. 11, 2011 8:15 pm

on my Mk I, the difference between 1 turn and 1.25 turns is the difference between 70* and "smelting iron" :)

 
titleist1
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Post by titleist1 » Tue. Jan. 11, 2011 9:15 pm

I recently found out that the number of turns will vary between coal deliveries. The last load of nut I picked up was a good bit larger on average than the nut size I am used to. I noticed it as it was being loaded into the pickup and asked about it. I was told that the larger pieces would accumulate toward the front of their truck on the trip back from the breaker and that happen to be the section of the pile I was loaded from. I knew I would need to give it less air than usual, but I was surprised at the big difference in temps that a 1/4 turn would effect. I was running 650*+ on the stove last night at the usual spinner knob setting that give me about a 500* reading. Closed it about 1/4 turn and checked it in an hour to find it was reading about 450*.

 
Bear038
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Post by Bear038 » Tue. Jan. 11, 2011 10:03 pm

I have a mark II and have been running Reading coal lately to try and get rid of what is left of it. The stack temp is taken just above the baro, and the other is on the side of the box about 4" down from the top. 1 turns generally gives 450 and 190 stack and will easily go 12-14 hours. I have been trying to run hotter for colder weather 1 1/2 to 3/4 runs 650 or so with a 210-220 stack. This eats considerably more, banking 3 times a day, using a good 60-70 pounds. I run higher on WC as my chimney does really well. Running around .06 to .09 from one turn up. Harman in their manual calls for a minium of .06 WC. For cooler running, baro covered with foil, 1/2 turn on air, 300-350, 190 stack and .04-.05 WC gives a full 24 hour burn.

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