Filter
Top Products
39
Installation & Operation Manual
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
AIR SEPARATOR
EXPANSION
TANK
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP
WATER
ZONE CIRCULATORS
(TYPICAL)
FLOW CHECK
VALVE
(TYPICAL)
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BOILER
CIRCULATOR
BOILER 2
(MEMBER 1)
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
PRESSURE
RELIEF VALVE
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
(LEADER)
SYSTEM SUPPLY
SENSOR
TEMPERATURE /
PRESSURE
GAUGE
DRAIN
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
MAY SUBSTITUTE LOW LOSS HEADER
ZONE #1
ZONE #2 ZONE #3 ZONE #4
Figure 6-4 Multiple Boilers - Single Temperature Zoned with Circulators
Model
Number of Units
2 3 4 5 6 7 8
Required Pipe Sizes
51 1" 1-1/4" 1-1/2" 2" 2" 2" 2"
81 1-1/4" 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2"
106 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 3"
151 2" 2" 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2"
211 2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 4"
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
6 Hydronic piping (continued)