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Posted by HeatPro on November 25, 2009 at 13:22:15:
In Reply to: Re: Cold Return posted by joe t on November 25, 2009 at 07:08:16:
The one with the cold spot probably is full of water that doesn't move through fast, while the hot one has hot water and steam move through. It wouldn't matter if there were 90's in the return piping unless they get clogged.
Counterflow means that the steam is flowing against the flow of the return water, and that can cause problems where piping doesn't have enough pitch (at least one inch in 10 feet,) or gets clogged.