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3 Hydronic piping
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
AIR SEPARATOR
EXPANSION
TANK
ZONE #1
ZONE #2
ZONE #3
ZONE #4
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP WATER
ZONE CIRCULATORS
(TYPICAL)
FLOW CHECK
VALVE
(TYPICAL)
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BOILER
CIRCULATOR
BOILER 2
(MEMBER 1)
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
(LEADER)
SYSTEM SUPPLY
SENSOR
TEMPERATURE /
PRESSURE
GAUGE
DRAIN
MAY SUBSTITUTE
LOW LOSS HEADER
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
IMG00371
Figure 3-5 Multiple Boilers - Single Temperature Zoned with Circulators
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