Posted by Harold Kestenholz - Hydronic Network on February 20, 2000 at 10:26:49:
In Reply to: Location of expansion tank - hot water heat posted by John Peters on February 20, 2000 at 09:51:38:
There is a full explanation with pictures in the free hot water heating design course at
http://www.hydronic.net
Look ar the sections about making positive and negative pressures. All commercial installations must use the 'pumping away' location as specified by boiler manufacturers since 1950, or there are serious problems. These locations were taught in all IBR courses over 50 years. The young installers just haven't learned about using the recommended location on residential systems yet. It takes time.