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Author Topic: stack temps  (Read 2833 times)

dutch

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stack temps
« on: March 19, 2018, 05:37:57 AM »

heard a lot about stack temps, went out and bought a probe type thermometer, bored a hole in the insulated pipe , what kind of temps should I be seeing, P&M BL 28-40.
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tinfoilhat2020

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Re: stack temps
« Reply #1 on: March 19, 2018, 06:58:33 AM »

with a HE conventional like the BL series I would think between 400-600 depending??? What are you seeing?
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tinfoilhat2020

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Re: stack temps
« Reply #2 on: March 19, 2018, 07:00:27 AM »

I see 300-400 on gasser, depending on the wood species and wood size for me
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E Yoder

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Re: stack temps
« Reply #3 on: March 19, 2018, 06:18:11 PM »

Agree with d5knapp, 400-600 maybe a couple hundred higher late in a burn with a huge coal bed. Conventional units vary more from cycle to cycle, how dry or big the wood is, etc. My experience anyway.
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wreckit87

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Re: stack temps
« Reply #4 on: March 20, 2018, 03:19:07 PM »

Depends a lot on wood and how you fill it. A normal 12 hour load of dry oak in my conventional typically runs 300-400 depending on the part of the cycle. 430 was the highest I'd seen it ever, until I filled it for 24 hours (double load) to prove a point to a crazy old hippie, which raised it to 480. Wet wood it never comes off the bottom and my gauge goes down to 200. I shoved it full of old magazines last week and saw 720 I believe. Last night shoved it 100% full of really dry, partially punky oak. Like almost 4 wheelbarrows full, 8x a typical load in 30 degree weather just as an experiment to see how long it'd last. I didn't stand there and watch the stack forever, but I never saw it hit 400 in the 15 minutes I was out there. There was a video of the raging blaze on Facebook, d5knapp saw it and can attest. I'd be very interested to see what your BL 2840 runs! They seem to be very efficient stoves and burn very clean in comparison to mine
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greasemonkoid

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Re: stack temps
« Reply #5 on: March 20, 2018, 05:00:21 PM »

Is there a (known and understood to be true) temperature which is either damaging or a waste of fuel - for the non-gas job? I've got a temperature controller to put on mine and had planned to use it to cut the combustion blower off when stack temp reached (X) degrees.
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E Yoder

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Re: stack temps
« Reply #6 on: March 20, 2018, 05:29:35 PM »

The stack is water cooled to where it exits the unit so I would think high temps shouldn't damage it. If they're running high  I'd look at throttling the draft a bit rather than completely shutting off the fan and short cycling.  My thought anyway.
« Last Edit: March 20, 2018, 05:41:25 PM by E Yoder »
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dutch

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Re: stack temps
« Reply #7 on: March 22, 2018, 10:30:43 AM »

my temps seem to stay around 200 f , but I think I have the wrong type of thermometer , the sensing bi metal strip is at the base of dial , maybe for regular stove pipe, any susgestions on a better probe thermometer
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wreckit87

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Re: stack temps
« Reply #8 on: March 22, 2018, 02:47:30 PM »

How long is your probe? I use just a cheap SBI one from Fleet Farm, was like $12 in the stove pipe aisle and has about a 4" probe. Seems to be quite accurate. Odd yours would have a probe at all if the sensor is on the base?
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dutch

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Re: stack temps
« Reply #9 on: March 23, 2018, 06:46:54 AM »

the probe part is about 3'' long , and has a coiled spring at base of thermometer , my chimney is 1'' insulated Selkirk.
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bill birks

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Re: stack temps
« Reply #10 on: March 23, 2018, 07:34:17 AM »

 running a Mahoning 200 when full of wood I have fire coming out stack witch is 3ft high -how efficient is that -last season for this furnace
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