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6
Hydronic piping
Figure 6-10 Multiple Boilers - Non-Zoned Primary/Secondary Piping
TEMPERATURE /
PRESSURE
GAUGE
BOILER 4
(MEMBER 3)
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
NOTICE
for all equipment and detailing required by local codes.
(continued)
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP WATER
SYSTEM
CIRCULATOR
TO
SYSTEM
BALL VALVE
(TYPICAL)
EXPANSION
TANK
(TYPICAL)
BOILER 3
(MEMBER 2)
Installation & Operation Manual
Model
2
3
81
1-1/4" 1-1/2"
106
1-1/2"
2"
151
2"
2"
211
2"
2-1/2"
286
2-1/2" 2-1/2"
PRESSURE
GAUGE
SYSTEM SUPPLY
SENSOR
AIR SEPARATOR
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
DRAIN POINT
(TYPICAL)
BOILER
CIRCULATOR
UNION
BOILER 2
(MEMBER 1)
Number of Units
4
5
6
7
Required Pipe Sizes
2"
2"
2-1/2" 2-1/2" 2-1/2"
2"
2-1/2" 2-1/2" 2-1/2"
2-1/2" 2-1/2"
3"
3"
3"
3"
3-1/2"
4"
3"
3-1/2" 3-1/2"
4"
FROM
SYSTEM
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
HOT
ANTI-SCALD
WATER
MIXING VALVE
OUT
FLOW CHECK
DOMESTIC
VALVE
HOT WATER
CIRCULATOR
DRAIN
BOILER 1
INDIRECT
(LEADER)
DHW TANK
8
3"
3-1/2"
4"
5"
COLD WATER
IN
45
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