Weil-McLain Technical Services Bulletin No SB0203, From System, Valve, Boiler, Pump, 3-WAY

Technical Services Bulletin No: SB0203 (Page 2 of 2)

Subject: Water Boiler Installations with Three-Way Valves

Date: November 22, 2002

FROM SYSTEM

	PUMP
TO	P1	3-WAY	PUMP
SYSTEM
		VALVE
			P2
			AT LEAST
			10 TO 20
			PIPE
			DIAMETERS
			BOILER

Figure 1

By-Pass Piping Using Three-Way Valve – Single Boiler

FROM SYSTEM

	PUMP
TO	P1	3-WAY	PUMP		PUMP
SYSTEM		VALVE
			P2	AT LEAST	P3	AT LEAST
				10 TO 20		10 TO 20
				PIPE		PIPE
			BOILER	DIAMETERS	BOILER	DIAMETERS

Figure 2

By-Pass Piping Using Three-Way Valve – Multiple Boilers