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Posted by joe on May 16, 2006 at 09:28:43:
http://www.energymanagertraining.com/equipment_all/boiler/boiler_dos.htm
last sentence of paragraph 2 ("Do #2"):
"Install a swing check valve on the return side of each zone to block the return side. The latter is necessary because buoyancy forces try to establish two-way flow in the return pipe. "
Does this apply to the European 2 pipe circuit installation?