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WHL-016 REV. 3.4.15
Figure 7 – Near Boiler Piping* – NOTE: This drawing is meant to show system piping concept only. Installer is responsible for all
equipment and detailing required by local codes. *Top / Bottom Supply / Return Connections available on 155, 199, 285, and 399 Models
ONLY.
NOTE: In piping applications utilizing a single zone, it is recommended that the installer use flow / check valves with weighted seats at
or near the boiler to prevent gravity circulation.