Keystoker Bypass Loop

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Posts: 206
Joined: Fri. Oct. 26, 2007 9:41 am
Stoker Coal Boiler: keystoker kaa-2
Coal Size/Type: rice coal / blaschak
Other Heating: pensotti oil boiler with riello 40 burner
Stove/Furnace Make: keystoker
Stove/Furnace Model: kaa-2
Location: new hampshire

Post Mon. Nov. 19, 2007 11:16 pm

hello everybody I am getting ready to install my keystoker kaa-2 boiler and I was wonder what he reason is for the by pass loop and is it really nessasary to have it. I will be installing my keystoker in series with my current oil burner. and my circultators are on my return side of the boiler.


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Posts: 7385
Joined: Sun. Nov. 20, 2005 8:02 pm
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland
Location: Michigan

Post Mon. Nov. 19, 2007 11:26 pm

Hi Chris, I believe the purpose of the bypass loop is to keep a slow circulation in the boiler to keep the water temperature high enough to heat a domestic hot water coil if installed. If you don't have or use a hot water heater coil, then you don't need a balance loop. Or if you plan on having your circulator running between the other boiler full time, this will accomplish the same purpose.

Greg L.
Burning Pea/Buckwheat through an antique stoker [semi retired SSboiler],
Running an Axeman-Anderson 260M boiler burning Pea, About 150-250#per day
Farming, Fixing, Fabricating and Flying: 'spare time' what's that?

Posts: 321
Joined: Mon. Oct. 29, 2007 8:26 pm
Stove/Furnace Make: 1958 Axeman-Anderson
Stove/Furnace Model: 260M
Location: South Central PA

Post Tue. Nov. 20, 2007 11:07 am

To add to what Greg said a bypass can do different thing depending on pump and bypass placement. One way will lower water temp going out to the system and one will raise water temp going back to the boiler. in my case I used a bypass that raises water temp going back the boiler because I have a lot of standing water in my cast iron rads and which return water would be around 80F and stop the pump and will also cause condensation in the boiler ( not good). So by adding a bypass I was able to raise the return water and stop any condensation plus it cured my excessive amount of clinkers.

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