Axeman Anderson Baro damper setup?

Axeman Anderson Baro damper setup?

PostBy: biggreen1 On: Fri Sep 12, 2008 10:25 pm

The draft control diagram(attached) in the instructions for my AA130 shows putting the 5" pipe from the boiler almost halfway into the opening of the 6" baro damper(look at dimension D).
Does anyone have theirs set up that way, and if so how did you seal the gap between the 5" to 6" pipe?
What is the logic Behind it?
Thanks, BG
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biggreen1
 

Re: Axeman Anderson Baro damper setup?

PostBy: U235a4 On: Fri Sep 12, 2008 10:40 pm

Check out my thread here and you will see that I have my damper that way on my 260m. I have a 6" stack pipe going into a 8" pipe with the baro.

http://nepacrossroads.com/about2192.html
U235a4
 
Stove/Furnace Make: 1958 Axeman-Anderson
Stove/Furnace Model: 260M

Re: Axeman Anderson Baro damper setup?

PostBy: LsFarm On: Sat Sep 13, 2008 12:57 am

The logic is that when the fan first starts, there is a short period of time where the draft in the flue pipe can be zero or slightly positive... The smaller pipe creates higher velocity and a slight negative pressure in the larger pipe where they are inserted together.. this will keep the ash and fumes from being forced out the damper door's gaps.

Greg L.
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland


Re: Axeman Anderson Baro damper setup?

PostBy: biggreen1 On: Sat Sep 13, 2008 10:13 am

Thanks for the answer LS. What did you fill the space with?
biggreen1
 

Re: Axeman Anderson Baro damper setup?

PostBy: LsFarm On: Sat Sep 13, 2008 10:52 am

I didn't install my baro damper following this design.. My AA 260 uses 6" flue pipe, and I had a 6" baro damper.. so I installed it without the recommended design.. and I do ocasionally get a small puff of ash out the damper when the fan starts.. BUT, my boiler is in an outbuilding, where dust and ash are not an issue..

I'm pretty sure you could buy a 6"-to-5" adapter, and cut the crimp off of the 5" pipe and slide it throught he adapter so the 5" pipe ends in the middle of the damper's TEE. you can then seal the slip joint with RTV sealant or high temp tape..

The small pipe within a larger pipe with an inlet on the side of the larger pipe is a very common type of 'pump'.. air craft use this to move fuel within tanks,, it is usually called a 'motive-flow' pump.. it has no moving parts, and functions only with fuel moving through the smaller higher pressure pipe.

Spray guns, siphon guns work this way too.

Greg L.
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland