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6
Hydronic piping
Figure 6-7 Multiple Boilers - Multiple Temperatures
BACKFLOW
PREVENTER
MAKE
UP
WATER
AIR SEPARATOR
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
TEMPERATURE /
PRESSURE
GAUGE
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.
42
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
Y-STRAINER
(RECOMMENDED)
UNION
(TYPICAL)
BOILER
Installation & Operation Manual
Model
2
3
Required Pipe Sizes
81
1-1/4" 1-1/2"
106
1-1/2"
2"
151
2"
2"
2-1/2" 2-1/2"
211
2"
2-1/2"
286
2-1/2" 2-1/2"
TEMPERATURE
TEMPERATURE
LOOP #2
LOOP #3
BOILER
DOMESTIC
CIRCULATOR
HOT WATER
CIRCULATOR
FLOW CHECK
VALVE
ANTI-SCALD
MIXING VALVE
DRAIN
BOILER
Number of Units
4
5
6
7
2"
2"
2-1/2" 2-1/2" 2-1/2"
2"
2-1/2" 2-1/2" 2-1/2"
3"
3"
3"
3"
3-1/2"
4"
3"
3-1/2" 3-1/2"
4"
MIXING VALVES
(TYPICAL)
HOT
WATER
OUT
INDIRECT
DHW TANK
8
3"
3-1/2"
4"
5"
COLD
WATER
IN
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