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

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

CAUTION

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

SEE PAGE 31 FOR ADDITIONAL

PIPING INFORMATION.

29

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

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.

Pipe and pump capacities for two (2) boiler systems	ALL PIPING MUST BE SUPPORTED.
based on 100 equivalent feet (30 meters) heater to
	FIGURE 22
tank loop.