Weil-McLain SB0203 - Manual (Page 2)

Technical Services Bulletin No: SB0203 (Page 2 of 2)
Subject: Water Boiler Installations with Three-Way Valves
Date: November 22, 2002
BOILER
SYSTEM
TO
P1
VALVE
3-WAY
PUMP
10 TO 20
PIPE
AT LEAST
DIAMETERS
P2
PUMP
FROM SYSTEM
Figure 1
By-Pass Piping Using Three-Way Valve – Single Boiler
10 TO 20
AT LEAST
DIAMETERS
3-WAY
VALVE SYSTEM
TO P1
BOILER
PUMP
P2
PIPE
PUMP
P3
BOILER
PUMP
AT LEAST
10 TO 20
DIAMETERS
PIPE
FROM SYSTEM
Figure 2
By-Pass Piping Using Three-Way Valve – Multiple Boilers