Dual feeds into and out of HS Tarm?

Dual feeds into and out of HS Tarm?

PostBy: pine grove coal user On: Sun Jun 16, 2013 9:48 pm

Soon I will be installing my "new" Tarm boiler. I am installing it in parallel with my oil burner. A circulator pump will continuously circulate the Tarm water to the oil burner.
A while back I remember reading about cold spots inside an EFM 520 and the fix was that it was very important to have the incoming water come in at both sides of the boiler and the outgoing water going out both sides of the boiler. Is this how I should plumb my Tarm? Or would it be sufficient to just have the in/out at catty-corners (lower front-right and upper rear-left) of the boiler? Or am I over thinking this?
Is the Tarm susceptible to cold spots inside the boiler?
pine grove coal user
 
Hand Fed Coal Boiler: H. S. Tarm, model 202, 1983
Hand Fed Coal Stove: Reading 'bucket a day' stove in storage, waiting for attention
Coal Size/Type: Pea and nut mix
Other Heating: New Yorker oil burner which almost never runs, thanks to the Tarm!

Re: Dual feeds into and out of HS Tarm?

PostBy: Rob R. On: Sun Jun 16, 2013 10:02 pm

Some manufactures recommend the use of both return ports, others do not...what does the Tarm piping diagram show?

I suppose using both ports is best, but for most applications it will run perfectly fine with just one return port in use. If you were going to run the boiler wide open with a wide differential between the supply and return the use of both ports becomes more important.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Dual feeds into and out of HS Tarm?

PostBy: pine grove coal user On: Mon Jun 17, 2013 9:00 am

The piping diagram shows just one connection for both supply and return.
I was also thinking while it is still in the barn, connect a garden hose to one port on the bottom and filling it with water. It the water comes out both top ports evenly then I would know that using just one port at top and bottom would be okay.
pine grove coal user
 
Hand Fed Coal Boiler: H. S. Tarm, model 202, 1983
Hand Fed Coal Stove: Reading 'bucket a day' stove in storage, waiting for attention
Coal Size/Type: Pea and nut mix
Other Heating: New Yorker oil burner which almost never runs, thanks to the Tarm!

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