Is This Return Piping Correct?

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ryan20strohl
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Post by ryan20strohl » Sat. Jul. 07, 2012 9:41 pm

Picture is down below.

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Is this return piping correct?

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Rob R.
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Post by Rob R. » 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.

 
ryan20strohl
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Post by ryan20strohl » 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


 
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Rob R.
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Post by Rob R. » 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.

 
ryan20strohl
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Post by ryan20strohl » 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

 
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Rob R.
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Post by Rob R. » 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.


 
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cArNaGe
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Post by cArNaGe » Sun. Jul. 08, 2012 10:59 am

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ryan20strohl
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Post by ryan20strohl » Sun. Jul. 08, 2012 2:39 pm

ok I understand

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