Circulators Push or Pull

heatboy

> What is the current feeling on the "best" way to <BR>
> install heating circulators? On the Feed side or <BR>
> the Return side of a loop system. <BR>
> <BR>
> I am <BR>
> talking about a Hot water Heating System (loop <BR>
> system using zone valves ). There seems to be <BR>
> professionals on both sides of the issue but none <BR>
> can give a good reason for their choice. I would <BR>
> welcome a discussion about this issue. Is it <BR>
> becuase of pressure in the boiler (good or bad), <BR>
> air getting into the system (from where?) and / <BR>
> or cooler temps on the return side ? <BR>
<BR>


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PipeBender

Circulators Push or Pull

What is the current feeling on the "best" way to install heating circulators? On the Feed side or the Return side of a loop system.

I am talking about a Hot water Heating System (loop system using zone valves ). There seems to be professionals on both sides of the issue but none can give a good reason for their choice. I would welcome a discussion about this issue. Is it becuase of pressure in the boiler (good or bad), air getting into the system (from where?) and / or cooler temps on the return side ?

[Deleted User]

it aids in air removal

to put the circulator downstream of the expansion tank on the supply piping. Dan has an excellent book on this subject.its called ''pumping away''. its in the BOOKS and MORE section of this web site.

Bill NTSG

Try this

> What is the current feeling on the "best" way to

> install heating circulators? On the Feed side or

> the Return side of a loop system.

>

> I am

> talking about a Hot water Heating System (loop

> system using zone valves ). There seems to be

> professionals on both sides of the issue but none

> can give a good reason for their choice. I would

> welcome a discussion about this issue. Is it

> becuase of pressure in the boiler (good or bad),

> air getting into the system (from where?) and /

> or cooler temps on the return side ?



book. I have been using the pump away method for over 10 yrs with excellent results. The only time I don't is when I am told not to by my boss. Go figure

eleft_4

Push or Pull

Hope these pic's help. Methods used from this book.

http://www.heatinghelp.com/shopcart/product.cfm?category=2-2


al

Bob Gagnon plumbing and heating

definitely push

i put pumps on the return for years. then a friend of mine talked me into pumping away. the first job i tried it on was a 4 story bldg. and i haven't been back in 5 years yet to purge it. pumping away has worked for me on many jobs since then. i strongly recommend it. bob

nick z.

Pumping away

is a very good book. and will make you understand how press. diff. moves the water,and what it does to the air in the system.

PipeBender

Some Manf. Feedback

Here is what I got from Taco.


In a low head residential system, circulator location is not critical. If you were to purchase a packaged boiler most will have the pump on the return side. It would be very rare to have any issues caused by pump location on a low head system. The correct location (and our recommendation) is on the supply side of the system, pumping away from the expansion tank. This should eliminate any possible issues. If you have any questions please feel free to contact us anytime.

Regards,
Rick Brindamour
Technical Services
401-942-8000 Ext. 275