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The bypass piping details shown in the piping diagrams
MUST be used for any one of the following conditions:
All large water content systems, including cast iron
A.
standing radiators, cast iron baseboard, converted
two-pipe steam systems, converted gravity circula-
tion systems and other similar systems.
Any system, including finned-tube baseboard, with a
B.
priority domestic hot water zone.
A ¾ inch bypass line must be installed as shown in the
piping diagrams
for the systems identified above.
BOILER SYSTEM PIPING
A bypass valve cannot protect the boiler from sus-
tained condensing operation for low temperature
applications such as radiant floor heating. These
types of system require active controls that pre-
vent the return of cold return water to the boiler.
Consult your local heating specialist. In addi-
tion, refer to the Radiant Panel Association (RPA)
www.radiantpanelassociation.org for piping recom-
mendations for non-condensing boiler applications.
NOTICE
