6
Hydronic piping
Figure 6-7 Multiple Boilers - Single Temperature Zoned with Circulators - DHW Priority
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
AIR SEPARATOR
EXPANSION
TANK
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP
WATER
ZONE CIRCULATORS
(TYPICAL)
FLOW CHECK
VALVE
(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)
SYSTEM SUPPLY
SENSOR
TEMPERATURE /
PRESSURE
GAUGE
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
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
42
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"
