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3 Hydronic piping (continued)
BOILER 1
(LEADER)
INDIRECT
DHW TANK
DOMESTIC
HOT WATER
CIRCULATOR
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
COLD WATER
IN
TEMPERATURE /
PRESSURE
GAUGE
AIR SEPARATOR
EXPANSION
TANK
BALL VALVE
(TYPICAL)
UNION
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP WATER
FROM
SYSTEM
TO
SYSTEM
BOILER 2
(MEMBER 1)
BOILER
CIRCULATOR
BOILER 3
(MEMBER 2)
BOILER 4
(MEMBER 3)
SYSTEM SUPPLY
SENSOR
DRAIN
SYSTEM
CIRCULATOR
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
MAY SUBSTITUTE LOW LOSS HEADER
HOT
WATER
OUT
IMG00376
Figure 3-10 Multiple Boilers - Non-Zoned Primary/Secondary Piping
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.
Indoor tank shown for illustration purposes.
NOTICE
Model
Number of Units
2345678
Required Pipe Sizes
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"
Outdoor Knight Boiler Installation & Operation Manual