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Re: circulator vs gravity

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Posted by Daniel on November 17, 2005 at 12:12:32:

In Reply to: Re: circulator vs gravity posted by Ron on November 17, 2005 at 10:19:17:

Thanks for the reply.
I think I may have it setup as you are advising, I have a picture here at http://www.geocities.com/cabanodan/My_Boiler_Piping.html
which illustrates my setup. When heated water leaves the boiler it goes in two directions as this is the way it was originaly piped and I simply went from 1 1/2" pipe from the boiler to 2 1/2" pipe (existing pipes), the return is done the same. I guess this the only way it could have been done with a gravity system. Could you have a look and see if I hadve it done correctly or is the something else I should do to make it make effective. Thanks

: The near boiler piping is critical in a gravity hot water system conversion to a forced gravity system. You must reduce the pipe sizing from the boiler to the existing piping and install a boiler bypass. Use about 1/2 the pipe size to the old existing pipe. Size the circulator for the system and a boiler bypass has more water bypassing the boiler then what is going through the system. The cool return water will bypass the boiler and allow the boiler to achieve an average water temperature above 140f so it stops condensing for boiler protection and get hotter water to blend with system water. This will drop system water temperature. Old gravity systems work with lower system temperatures and have larger radiators. This piping will allow for better comfort while protecting the boiler.

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