Weil-McLain - SB0203

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Contents

gUIDl fflclAIN Wei3 McLain Company SOO Blaine Street Michigan City IN 46360 2338 Number SB0203 Page 1 of2 Date November 22 2002 Subject Water Boiler Installations with Three Way Valves Primary Secondary pumping is the preferred method for system temperature modulation in commercial hydronic heating installations Three way valves are also used on many installations for this purpose Without proper system design and control three way valves can cause cold system water to be returned to a hot boiler This condition could lead to boiler thermal shock creating a potential for section failure With minimal equipment investment thermal shock conditions can be reduced on three way valve installations Weil McLain makes the following design recommendations ...