Is this return piping correct?

Is this return piping correct?

PostBy: ryan20strohl On: Sat Jul 07, 2012 9:41 pm

Picture is down below.
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Is this return piping correct?
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ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: Is this return piping correct?

PostBy: Rob R. On: Sat Jul 07, 2012 10:17 pm

Is the copper the bypass loop? The way it is piped it isn't really a boiler bypass, but it will serve as an equalizer loop and help keep the boiler temperature uniform.
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: Is this return piping correct?

PostBy: ryan20strohl On: Sun Jul 08, 2012 8:14 am

yes the copper pipe is the bypass, do u have a pic of what the pipping should look like
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: Is this return piping correct?

PostBy: Rob R. On: Sun Jul 08, 2012 9:18 am

EFM has a diagram in the manual, but the only thing you are missing to make that loop a "boiler bypass" is a valve between the boiler and the tee where the copper joins. You would adjust that valve so some of the cool water from the zones bypasses the boiler...this helps prevent thermal shock and promotes long circulation times. The other benefit is that the bypass loop helps prevent stratification within the boiler when nothing is ciculating. Your current piping setup will accomplish the second part, and if you don't have a high-mass (big cast iron radiators, radiant slab) zone piped off the boiler, I wouldn't worry about the bypass valves.

Here is a setup similar to yours with the bypass valves installed:

Image

Again, if none of the zones are large enough to overwhelm the boiler with cold water the way you have it piped should work just fine.
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: Is this return piping correct?

PostBy: ryan20strohl On: Sun Jul 08, 2012 9:56 am

i have the vavle its in the center of the bypass sorry i dint get it in the pic
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: Is this return piping correct?

PostBy: Rob R. On: Sun Jul 08, 2012 10:43 am

That isn't the valve I was referring to. To make the water go around the boiler you need a valve between the boiler and that tee with the copper coming out. Think like water...

Like I mentioned before, it isn't required unless the EFM gets overwhelmed with cold water when a zone kicks on.
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: Is this return piping correct?

PostBy: cArNaGe On: Sun Jul 08, 2012 10:59 am

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cArNaGe
 

Re: Is this return piping correct?

PostBy: ryan20strohl On: Sun Jul 08, 2012 2:39 pm

ok i understand
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520