Boiler Flue Sizing VF3000

Boiler Flue Sizing VF3000

PostBy: coalmeister On: Sun Jul 20, 2008 9:46 am

I am in the early stages of installing my Harmon VF3000 boiler. The Harmon website says the unit has a 7" flue but the owners manual says to use a 6" pipe to the chimney and the stoves flue actually measures 6" on the inside diameter (and something like 6-1/2 on the o.d.) I am using Stainless steel double wall chimney pipe through the garage roof and up another story of the house. It appears the website is wrong. Or am I missing something? - Thanks
coalmeister
 
Stove/Furnace Make: Alaska 140 Furnace -sold
Stove/Furnace Model: Harmon VF3000 -sold

Re: Boiler Flue Sizing VF3000

PostBy: coalkirk On: Sun Jul 20, 2008 10:31 am

Use the 6" pipe. It's one of many errors and ommissions in their manual and website. Also missing from the manual is the need to install the small round metal restrictor plate on the combuustion fan intake to regulate combustion air into the boiler. Make sure you install it or you will over pressurize the combustion chamber and force flue gas out the coal hopper.
coalkirk
 
Stoker Coal Boiler: Harman VF3000
Coal Size/Type: antrhcite/rice coal

Re: Boiler Flue Sizing VF3000

PostBy: syncmaster On: Sun Jul 20, 2008 10:37 am

I have a vf3000 on order so I have looked into this and I think harman is refering to a square masonay flue when it calls for 7" .
The way smoke behaves it rises in a circular fashion so only the circular part of a square masonary chimney is what actually counts.
So if you put a 6" stack pipe from your vf3000 into a 7" square masonary flue your chimney would be the same size as far as the smoke is concerned.

here is a link that explains it better.

http://hearth.com/econtent/index.php/ar ... ce_sizing/
syncmaster
 
Stoker Coal Boiler: harmanVF3000 Coal/oil option
Coal Size/Type: Rice
Stove/Furnace Make: VF3000
Stove/Furnace Model: Harman VF3000

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