Lochinvar Knight 151 Installation & Operation Manual page 20

3
Hydronic piping
Figure 3-7 Multiple Boilers - Multiple Temperatures
BACKFLOW
PREVENTER
MAKE
UP
WATER
AIR SEPARATOR
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
Y-STRAINER
(RECOMMENDED)
UNION
(TYPICAL)
Mixing valves are required for the protection of low temperature loops.
CAUTION
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.
20
PRESSURE
TEMPERATURE
REDUCING VALVE
LOOP #1
PRESSURE
GAUGE
SYSTEM
SUPPLY
SENSOR
EXPANSION
TANK
MAY SUBSTITUTE
LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
FLOW CHECK
TEMPERATURE /
PRESSURE
BOILER
GAUGE
Outdoor Knight Boiler Installation & Operation Manual
Model
2 3
151 2" 2"
211 2" 2-1/2"
286 2-1/2" 2-1/2"
TEMPERATURE TEMPERATURE
LOOP #2
LOOP #3
120VAC TO PUMPS
MULTI-TEMP
BOILER
LOOP CONTROL
CIRCULATOR
(OPTIONAL)
DOMESTIC
VALVE HOT WATER
CIRCULATOR
BOILER
DRAIN
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"
WIRES TO
LOOP
SENSORS
MIXING VALVES
(TYPICAL)
24V
SIGNAL
TO MIXING
VALVES
SHIELDED CABLE TO
BOILER CONTROL
HOT
ANTI-SCALD WATER
MIXING OUT
VALVE
COLD
WATER
IN
INDIRECT
DHW TANK
IMG00373
8
3-1/2"
4"
5"