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Installation & Operation Manual
6 Hydronic piping
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
TEMPERATURE /
PRESSURE
GAUGE
AIR SEPARATOR
EXPANSION
TANK
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP WATER
ZONE VALVES
(TYPICAL)
BOILER
CIRCULATOR
BOILER 2
(MEMBER 1)
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
(LEADER)
DIFFERENTIAL
PRESSURE BYPASS
VALVE (IF USED)
SYSTEM SUPPLY
SENSOR
(WHEN USED)
SYSTEM
CIRCULATOR
DRAIN
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
ZONE #1
ZONE #2 ZONE #3 ZONE #4
FLOW CHECK
VALVE
Figure 6-9 Multiple Boilers - Single Temperature Zoned with Valves
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
Model
Number of Units
2345678
Required Pipe Sizes
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" 3-1/2"
211 2" 2-1/2" 3" 3" 3-1/2" 4" 4"
286 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 5"