41
6
Hydronic piping
(continued)
Figure 6-6 Multiple Boilers - Single Temperature Zoned with Circulators - 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
CAUTION
Mixing valves are required for the protection of low temperature loops.
Installation & Service Manual
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)
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BOILER
CIRCULATOR
BOILER 2
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
SYSTEM SUPPLY
SENSOR
(OPTIONAL)
TEMPERATURE /
PRESSURE
GAUGE
DRAIN
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
MAY SUBSTITUTE LOW LOSS HEADER
PRESSURE
RELIEF VALVE
IMG00240
ZONE #1
ZONE #2
ZONE #3
ZONE #4
Model
Number of Units
2
3
4
5
6
7
8
Required Pipe Sizes
40
1"
1-1/4" 1-1/4" 1-1/2"
2"
2"
2"
70
1-1/4" 1-1/2"
2"
2"
2-1/2" 2-1/2" 2-1/2"
100
1-1/2"
2"
2"
2-1/2" 2-1/2"
3"
3"
120
2"
2"
2-1/2" 2-1/2"
3"
3"
3-1/2"
