A.O. Smith DB/DW-720-1810 warranty Npt

TWO DURA-MAX (MODEL DW) HOT WATER SUPPLY BOILERS WITH HORIZONTAL TANK

CAUTION

TO PREVENT CONDENSATION THE MINIMUM BOILER INLET TEMPERATURE IS 100°F (38°C)

30

SEE PAGE 31 FOR ADDITIONAL PIPING INFORMATION.

IMPORTANT

THE INSTALLATION OF SAFETY FLOW SWITCHES AS SHOWN IS REQUIRED TO PROTECT THE BOILER IN CASE OF WATER SERVICE INTERRUPTION OR CIRCULATOR FAILURE.

NOTE: THERMOMETERS, RELIEF VALVES, CIRCULATORS, SAFETY FLOW SWITCHES AND TANK CONTROLS ARE AVAILABLE THROUGH A.O.SMITH.

CAUTION

PUMP MUST BE RATED FOR SYSTEM OPERATING TEMPERATURE AND PRESSURE.

*SAFETY RELIEF VALVE RATING SHOULD NOT EXCEED PRESSURE CAPACITY OF ANY COMPONENT IN THE SYSTEM.

INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.

+BALL VALVES ARE SHOWN FOR SERVICING BOILER, HOWEVER, LOCAL CODES SHALL GOVERN THEIR USAGE.

ALL PIPING MUST BE SUPPORTED.

Guide To Pipe and Pump Sizing

Two (2) Boiler Systems

	Common
	Manifold Pipe	Boiler Pipe Size
Model	Size "A" (Min.)	"B" (Min.) and Pump
720, 840	2-1/2"
	NPT	See Table 7
960-1810	3"
	NPT

Pipe and pump capacities for two (2) boiler systems based on 100 equivalent feet (30 meters) heater to tank loop.

FIGURE 23