6
Hydronic piping
(continued)
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING
VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
TEMPERATURE /
PRESSURE
GAUGE
AIR SEPARATOR
EXPANSION
TANK
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP WATER
ZONE VALVES
(TYPICAL)
BOILER
CIRCULATOR
BOILER 2
(MEMBER 1)
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
PRESSURE
RELIEF VALVE
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
(LEADER)
DIFFERENTIAL PRESSURE
BYPASS VALVE
(RECOMMENDED)
SYSTEM SUPPLY
SENSOR
SYSTEM
CIRCULATOR
DRAIN
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
ZONE #1
ZONE #2 ZONE #3 ZONE #4
Figure 6-6 Multiple Boilers - Single Temperature Zoned with Zone Valves - DHW Priority
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.
NOTICE
41
Installation & Operation Manual
Model
Number of Units
2
3
4
5
6
7
8
Required Pipe Sizes
55
1-1/4" 1-1/2" 1-1/2"
2"
2"
2"
2"
85
1-1/4" 1-1/2"
2"
2"
2"
2-1/2" 2-1/2"
110
1-1/2"
2"
2"
2-1/2" 2-1/2" 2-1/2"
3"
155
2"
2"
2-1/2" 2-1/2"
3"
3"
4"
199
2"
2"
2-1/2"
3"
4"
4"
4"
285
2-1/2" 2-1/2"
3"
4"
4"
4"
5"
399
2-1/2"
3"
4"
4"
5"
5"
5"
