Lochinvar Knight 151 Installation & Operation Manual page 22

3
Hydronic piping
Figure 3-9 Multiple Boilers - Single Temperature Zoned with Valves
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
BALL VALVE
(TYPICAL)
SYSTEM SUPPLY
MAKE UP WATER
(WHEN USED)
AIR SEPARATOR
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.
Indoor tank shown for illustration purposes.
22
ZONE #1
PRESSURE
GAUGE
SENSOR
SYSTEM
CIRCULATOR
EXPANSION
TANK
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
UNION
(TYPICAL)
BOILER 2
(MEMBER 1)
Outdoor Knight Boiler Installation & Operation Manual
Model
2 3
151 2" 2"
211 2" 2-1/2"
286 2-1/2" 2-1/2"
ZONE #2 ZONE #3 ZONE #4
ANTI-SCALD
MIXING VALVE
BOILER
CIRCULATOR
DOMESTIC
HOT WATER
CIRCULATOR
DRAIN
BOILER 1
(LEADER)
Number of Units
4 5 6 7
Required Pipe Sizes
2-1/2" 2-1/2" 3" 3"
3" 3" 3-1/2" 4"
3" 3-1/2" 3-1/2" 4"
ZONE VALVES
(TYPICAL)
DIFFERENTIAL
PRESSURE BYPASS
VALVE (IF USED)
HOT
WATER
OUT
COLD
WATER
IN
INDIRECT
DHW TANK
IMG00375
8
3-1/2"
4"
5"