Bradford White SW-2-40R-L Installation And Operating Manual page 19

Water Connections continued-
CONNECT WATER BOILER SUPPLY PIPING
1. For a space heating system that utilizes ZONE VALVES, refer to
Figure 2. The indirect-fired water heater connection labeled
"FROM BOILER SUPPLY" should be piped to the boiler supply
piping. Mount the circulator making sure the flow arrow points
toward the water heater. The use of shut-off valves and unions
are recommended for future service convenience. The use of an
air separator and vent is recommended to eliminate air in the
system. Pipe and fittings between the boiler and indirect-fired
water heater must be ¾" diameter or larger.
Maximum boiler water supply temperature to the indirect
heat exchanger must not exceed 240°F (116°C).
Figure 2 - Water Boiler Piping with Zone Valves
2. For a space heating system that utilizes CIRCULATORS, refer to
Figure 3. The indirect-fired water heater connection labeled
"FROM BOILER SUPPLY" should be piped to the boiler supply
piping. Mount the circulator making sure the flow arrow points
toward the water heater. The use of shut-off valves and unions are
recommended for future service convenience. The use of an air
separator and vent is recommended to eliminate air in the system.
Pipe and fittings between the boiler and indirect-fired water heater
must be ¾" diameter or larger.
CAUTION
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