Too much draft?

Too much draft?

PostBy: mmcoal On: Sat Oct 26, 2013 12:09 am

I have been running my Hitzer this week and really like it so far. I think I am using too much coal though. I just went through about half a hopper in a 12 hour period. I am starting to wonder if my draft is too strong. I know the only real way to tell is with a manometer which I plan to get, but it just doesn't seem to matter whether the MPD is open or closed. I have a temp guage on the stack after the MPD and one on the stove top. I am trying to run the stove around 250 today which put the stack at 150 most of the time and closer to 200 after a good shake. Those stack temperatures don't change when I play with the MPD and I can't see any noticeable change in the blue ladies with the MPD closed as opposed to open. When I light a match and put the flame near a slight gap in the stove pipe connection before the mpd it always get's sucked in which I assume is a good thing. I know I have a lot more trial and error ahead of me, but just curious if anyone else thinks I might have a strong draft issue? Thanks, Chris
mmcoal
 
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut

Re: Too much draft?

PostBy: anthony7812 On: Sat Oct 26, 2013 12:24 am

Once you have a manometer in place you WILL be able to answer your question, until then your really just playin a guessing game. Not to create a huge debate but you ever think of a Barometric Damper?
anthony7812
 
Stoker Coal Boiler: VanWert VA 400
Coal Size/Type: Buck/Nut/Anthracite

Re: Too much draft?

PostBy: blrman07 On: Sat Oct 26, 2013 7:36 am

Not a silly question but are you sure the paddle is on the MPD?
blrman07
 
Hand Fed Coal Boiler: Bucket a Day
Hand Fed Coal Stove: Vigilant Casting 2310
Baseburners & Antiques: rebuilding a 1906 March Brownback Double Heater, reblacking a UMCO 1920's Pot Belly
Coal Size/Type: Pea/Nut/Wood in the VC and anything that will fit in the Bucket a Day. It's not fussy.


Re: Too much draft?

PostBy: dcrane On: Sat Oct 26, 2013 7:42 am

blrman07 wrote:Not a silly question but are you sure the paddle is on the MPD?


I was just going to say the same thing... are you sure your MPD is functioning and intact? are sure their is NO air infiltration into the stove anyplace their shouldn't be (dollar bill test and inspect!)....Gasket Replacement?

the good news is... the photo of your set is great, clearly your draft is great, your stove is very well respected... all else is easy peazy so fear not! (the solutions will be far easier than no draft :lol: )
dcrane
 
Hand Fed Coal Stove: Crane 404

Re: Too much draft?

PostBy: mmcoal On: Sat Oct 26, 2013 9:38 am

I am 99.9% sure the paddle is on, lol. As far as air leaks, it is a new stove and when I did the flame test around the doors and I couldn't see it get sucked in anywhere. The only two places I can think of would be around the shaker handle and the two little screw holes for the magnet on the back flap because I tried the paper clip trick and didn't put the screws back in. I am thinking of just putting the magnet back on and trying it the way they designed it. Thanks, Chris
mmcoal
 
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut

Re: Too much draft?

PostBy: mmcoal On: Wed Nov 13, 2013 8:39 pm

A little update, I got a manometer and have it set on the wall with oil in it but no connection to stove pipe yet. Obviously I will post a reading as soon as possible, but just curious what range am I looking for when I am reading the manometer? With the temps getting in the low 20's at night I can actually hear the air whistling through the stove pipe. I set the stove at around 400 last night and after the shake down this morning my stack almost hit 500 degrees with the MPD closed! My lowest stack temp running the stove at 400 is about 250 and that is off a magnetic guage also. I also noticed that the draft is strong enough to suck the cast clean out door tight against the frame on the chimney instead of having the usual play in it.
mmcoal
 
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut

Re: Too much draft?

PostBy: titleist1 On: Wed Nov 13, 2013 10:28 pm

my preference on my stove / chimney setup is to have a .04 reading on the manometer max and .02 minimum. up to .06 probably isn't too bad as far as sending heat up the chimney, but you will have to be the judge of that for your installation.

imo that 500* stack temp is very high! 250* on the stack with the stove at 400* would also be a little on the high side for me, especially measured with a magnetic. at 400* i would expect to be in the 175* range with my probe temp. my stack is never higher than 300* and that is with a stove temp above 600*. you will have to take some measurements with the mano and see what your normal temps stove : stack run.

if it is sucking the door closed on your clean out, you better keep the cat on the other side of the room or fluffy might get sucked into the stove! :shock:
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: Too much draft?

PostBy: freetown fred On: Wed Nov 13, 2013 11:17 pm

Your MPD will not effect the ladies--your under air will--is hopper door dollar bill tested--mm, where are your ash door vents set????????? what's goin on with your thermo flap in the back--did you out it back the way they MADE IT? Was it nice & windy when you heard the whistling??? I know mine will. How do you set your stove at 400?????
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Too much draft?

PostBy: mmcoal On: Wed Nov 13, 2013 11:55 pm

freetown fred wrote:Your MPD will not effect the ladies--your under air will--is hopper door dollar bill tested--mm, where are your ash door vents set????????? what's goin on with your thermo flap in the back--did you out it back the way they MADE IT? Was it nice & windy when you heard the whistling??? I know mine will. How do you set your stove at 400?????

The hopper door gasket is very uniform and flat all the way around and I always make sure it gets latched down. Ash pan door vents I try to always keep closed unless I am trying to catch the fresh coal that fell from the hopper and thats usually only for a short period of time. As far as the flapper I still have the magnet off because it seemed to be doing so well at the lower temperatures and I really didn't see how it could improve my situation. I am finding that at the higher stove temp everytime the thermo flap gets close to shut, the draft just sucks it in anyway and the stove cools down almost 100 degrees before it pops back open and thats when I start to see the stack temperature spike.
mmcoal
 
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut

Re: Too much draft?

PostBy: freetown fred On: Thu Nov 14, 2013 12:01 am

mm, try just cracking your ash door vents--1/16 moon or close--please--put the magnet back --you are burning NUT???
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Too much draft?

PostBy: mmcoal On: Sun Nov 17, 2013 4:39 pm

Alright, hooked the mano up today(before the mpd) and with the stack at around 125-150(low idle) and an outside temp of about 54(no wind, a little rain) I am between -.02 and -.03 . I am burning nut right now with the magnet back on. Suppose to go back down into the 20's at night this week so I will see where I am then. From what I read my reading right now seems fairly average, would anything over the -.05 mark be too high? Thanks, Chris
mmcoal
 
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut

Re: Too much draft?

PostBy: Lightning On: Sun Nov 17, 2013 4:53 pm

Personally I think a -.03 with spikes of -.05 (from wind) is the golden zone for hand feds.. I like to keep mine at a -.03 seems to run nice and steady there with minimal efficiency loss due to any leaks that aren't contributing to combustion. :D
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: Too much draft?

PostBy: mmcoal On: Wed Nov 20, 2013 12:57 pm

I have finally been able to get a reading with the outside temps in the upper 20's and low 30's. For some reason I am having some trouble getting the stove over 300 now and the stack still runs away on me(400+) at times. My mano is reading around -.07 to -.09 with the stove heating back up and the MPD closed. If I open the MPD up I notice the draft go up even further. I know the bi metal damper is suppose to regulate this stove, but I am thinking I will need a baro. I have a feeling if the temps drop more and I crank the stove up more I will be in excess of of -.1 on the manometer.
mmcoal
 
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut

Re: Too much draft?

PostBy: Lightning On: Wed Nov 20, 2013 1:27 pm

Wow yeah that's too much. A barometric should help with that. Some people have even put in two manual dampers but may say that isn't really safe.
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: Too much draft?

PostBy: freetown fred On: Wed Nov 20, 2013 1:29 pm

You tending every 12 hrs? Baro seems to be the ONLY thing you haven't tried. I've never seen anybody have so much trouble with a hand-fired--especially the 50-93. It's normally a light, tend & forget :o :(
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix