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6
Hydronic piping
Figure 6-7 Multiple Boilers - Single Temperature Zoned with Circulators - DHW Priority
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP
WATER
SYSTEM SUPPLY
AIR SEPARATOR
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
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.
42
ZONE #1
PRESSURE
GAUGE
SENSOR
EXPANSION
TANK
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BOILER
CIRCULATOR
PRESSURE
RELIEF VALVE
BOILER 2
(MEMBER 1)
DRAIN
UNION
(TYPICAL)
Installation & Operation Manual
Model
2
3
55
1-1/4" 1-1/2" 1-1/2"
85
1-1/4" 1-1/2"
110
1-1/2"
2"
155
2"
2"
199
2"
2"
285
2-1/2" 2-1/2"
399
2-1/2"
3"
ZONE #2 ZONE #3 ZONE #4
ANTI-SCALD
MIXING VALVE
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
DOMESTIC
HOT WATER
CIRCULATOR
BOILER 1
(LEADER)
DHW TANK
Number of Units
4
5
6
7
Required Pipe Sizes
2"
2"
2"
2"
2"
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"
2-1/2"
3"
4"
4"
3"
4"
4"
4"
4"
4"
5"
5"
FLOW CHECK
VALVE
(TYPICAL)
ZONE CIRCULATORS
(TYPICAL)
HOT
WATER
OUT
COLD
WATER
IN
INDIRECT
8
2"
3"
4"
4"
5"
5"
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