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6
Hydronic piping
Figure 6-6 Multiple Boilers - Single Temperature Zoned with Zone Valves - DHW Priority
PRESSURE
REDUCING
BACKFLOW
PREVENTER
BALL VALVE
(TYPICAL)
MAKE UP WATER
SYSTEM SUPPLY
AIR SEPARATOR
EXPANSION
DRAIN POINT
TEMPERATURE /
PRESSURE
GAUGE
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)
ZONE #1
VALVE
PRESSURE
GAUGE
SENSOR
SYSTEM
CIRCULATOR
TANK
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
(TYPICAL)
BOILER
CIRCULATOR
PRESSURE
RELIEF VALVE
BOILER 2
(MEMBER 1)
DRAIN
(TYPICAL)
Model
2
55
1-1/4" 1-1/2" 1-1/2"
85
1-1/4" 1-1/2"
110
1-1/2"
155
2"
199
2"
285
2-1/2" 2-1/2"
399
2-1/2"
ZONE #2 ZONE #3 ZONE #4
MAY SUBSTITUTE LOW LOSS HEADER
ANTI-SCALD
Y-STRAINER
MIXING VALVE
(RECOMMENDED)
(TYPICAL)
DOMESTIC
HOT WATER
CIRCULATOR
BOILER 1
(LEADER)
UNION
Installation & Operation Manual
Number of Units
3
4
5
6
Required Pipe Sizes
2"
2"
2"
2"
2"
2"
2"
2-1/2" 2-1/2" 2-1/2"
2"
2-1/2" 2-1/2"
3"
2"
2-1/2"
3"
4"
3"
4"
4"
3"
4"
4"
5"
ZONE VALVES
(TYPICAL)
DIFFERENTIAL PRESSURE
BYPASS VALVE
(RECOMMENDED)
HOT
WATER
OUT
COLD
WATER
IN
INDIRECT
DHW TANK
7
8
2"
2"
2-1/2" 2-1/2"
3"
3"
4"
4"
4"
4"
5"
5"
5"
41
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