A.O. Smith DB/DW-720-1810 User Manual page 28

ONE DURA-MAX (MODEL DW) COMMERCIAL BOILER WITH HORIZONTAL TANK
TO PREVENT CONDENSATION THE MINIMUM BOILER INLET TEMPERATURE IS 100°F (38°C)
IMPORTANT
SAFETY FLOW SWITCH AS SHOWN TO PROTECT THE BOILER
IN CASE OF WATER SERVICE INTERRUPTION OR CIRCULATOR
FAILURE.
INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.
SEE PAGE 31 FOR
ADDITIONAL PIPING INFORMATION.
CAUTION
PUMP MUST BE RATED FOR SYSTEM OPERATING TEMPERA-
TURES AND PRESSURE.
SEE TABLE 7 FOR GUIDE TO PIPE AND PUMP SIZING.
* SAFETY RELIEF VALVE RATING SHOULD NOT EXCEED PRES
SURE CAPACITY OF ANY COMPONENT IN THE SYSTEM.
+ BALL VALVES ARE SHOWN FOR SERVICING BOILER,
HOWEVER, LOCAL CODES SHALL GOVERN THEIR USAGE.
FIGURE 21
28
CAUTION