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Old 02-24-2013, 09:24 AM   #1
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circulating pump feeding gv90boiler with existing circulator


Hello,

I recently replaced a 20+ year boiler with a Weil-Mclain GV90+4. My installer simply replaced the existing boiler with the GV90+4 and did not change any of the existing setup, including a circulating pump on the return line that is continuously circulating into the boiler.

The new boiler has an internal Taco 007 System Circulator that is used to move the water. Is this a problem? In the GV90+ manual I read the following:

"Never install another pump in series with the GV90+ boiler. Forced flow can cause improper operation of the boiler controls. Substantial property damage could result.

Failure to comply could result in unreliable performance and nuisance shutdowns from insufficient flow."

So is my configuration an example of a pump being installed in "series"?

Since the original pump is continuously running what happens when the boiler is not running? Does water enter the boiler? Does the pump need to be removed or relocated to the supply line?

Thanks in advance!





Last edited by toronto99; 02-24-2013 at 09:40 AM. Reason: more information
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Old 02-24-2013, 09:59 AM   #2
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circulating pump feeding gv90boiler with existing circulator


Post pics of the piping at the boiler so we can see how it is piped.

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Old 02-24-2013, 11:28 AM   #3
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circulating pump feeding gv90boiler with existing circulator


We need to see the piping coming out of and going back into the boiler, how it's connected the original piping and where and how and where the old pump is located.

Stand back aways and get shots from all available angles/sides. Detail is not as important as the overall view.
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Old 02-24-2013, 01:38 PM   #4
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circulating pump feeding gv90boiler with existing circulator


I've taken some pictures and posted them below.

The first pic is from the front of the boiler. The second pic is the supply. In the third picture, the pipe in the front is the return. the forth picture is from the side.
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circulating pump feeding gv90boiler with existing circulator-boiler.jpg   circulating pump feeding gv90boiler with existing circulator-supply.jpg   circulating pump feeding gv90boiler with existing circulator-return.jpg   circulating pump feeding gv90boiler with existing circulator-expansiontank.jpg  
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Old 02-24-2013, 03:13 PM   #5
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circulating pump feeding gv90boiler with existing circulator


Looks incorrect. So it should be corrected for proper and reliable operation.

PS: a pic tht shows all the piping along with close ups like you have works better.
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Old 02-24-2013, 03:26 PM   #6
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circulating pump feeding gv90boiler with existing circulator


I will get better pictures tonight and post them.

So it sounds like you're saying that the circulator should be moved to the supply line? Or maybe I don't need this at all if the built-in circulator is strong enough? I believe the existing one was there because the old boiler didn't have one.

Thanks for your patience. This is my first time dealing with a boiler and I obviously don't know very much. I appreciate any help you can give.
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Old 02-24-2013, 03:36 PM   #7
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circulating pump feeding gv90boiler with existing circulator


Quote:
Originally Posted by toronto99 View Post
I will get better pictures tonight and post them.

So it sounds like you're saying that the circulator should be moved to the supply line? Or maybe I don't need this at all if the built-in circulator is strong enough? I believe the existing one was there because the old boiler didn't have one.

Thanks for your patience. This is my first time dealing with a boiler and I obviously don't know very much. I appreciate any help you can give.
Not moved. The boiler should be on a primary/secondary pipe set up. It need re-piped.

Similar to below.

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Old 02-25-2013, 05:22 AM   #8
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circulating pump feeding gv90boiler with existing circulator


I hope these pictures help:
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circulating pump feeding gv90boiler with existing circulator-entire.jpg   circulating pump feeding gv90boiler with existing circulator-pump.jpg   circulating pump feeding gv90boiler with existing circulator-side.jpg  
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Old 02-25-2013, 04:42 PM   #9
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circulating pump feeding gv90boiler with existing circulator


Yep, should have done primary/secondary piping. instead of using that 007 as the only circ.

A 007 circ is a low head circ. Not suitable for being used as it is on your system.
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Old 02-25-2013, 05:00 PM   #10
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circulating pump feeding gv90boiler with existing circulator


Thank you for the advice. I will talk with the installer.

I have a question though: does the circulator on the return line only help move the water in the system when the boiler and built-in circulator are running? i guess i'm asking what happens when the boiler and built-in circulator are off. Is the circulator on the return line pushing water against a closed boiler? Or is the boiler open and water is being moved, but not as much as if it was re-piped as a primary/secondary. In the current setup, the circulator on the return is always pumping. Should it be changed so that it pumps only when the boiler and built-in circulator are running?
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Old 02-25-2013, 05:01 PM   #11
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circulating pump feeding gv90boiler with existing circulator


Depends on how he has it wired.

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