Lochinvar Knight 151 Installation & Operation Manual page 23

3
Hydronic piping
Figure 3-10 Multiple Boilers - Non-Zoned Primary/Secondary Piping
TEMPERATURE /
PRESSURE
GAUGE
BOILER 4
(MEMBER 3)
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.
Indoor tank shown for illustration purposes.
Outdoor Knight Boiler Installation & Operation Manual
(continued)
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP WATER
SYSTEM
CIRCULATOR
TO
SYSTEM
BALL VALVE
(TYPICAL)
EXPANSION
TANK
UNION
(TYPICAL)
BOILER 3
(MEMBER 2)
Number of Units
Model
2 3 4
Required Pipe Sizes
151 2" 2" 2-1/2" 2-1/2"
211 2" 2-1/2" 3"
286 2-1/2" 2-1/2" 3"
PRESSURE
GAUGE
SYSTEM SUPPLY
SENSOR
AIR SEPARATOR
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
DRAIN POINT
(TYPICAL)
Y-STRAINER
(RECOMMENDED)
BOILER
CIRCULATOR
DRAIN
BOILER 2
(MEMBER 1)
5 6 7
3" 3" 3-1/2"
3" 3-1/2" 4"
3-1/2" 3-1/2" 4"
FROM
SYSTEM
(TYPICAL)
HOT
ANTI-SCALD
WATER
MIXING VALVE
OUT
DOMESTIC
HOT WATER
COLD WATER
CIRCULATOR
BOILER 1
INDIRECT
(LEADER)
DHW TANK
IMG00376
23
8
4"
5"
IN