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6A
Hydronic piping
Figure 6-4 Multiple Boilers - Single Temperature Zoned with Circulators_COMBI ONLY
BOILER 2
DHW piping omitted for clarity.
NOTICE
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.
38
Model
PRESSURE
TEMPERATURE /
REDUCING VALVE
PRESSURE GAUGE
BACKFLOW
PREVENTER
MAKE UP
WATER
SYSTEM SUPPLY
SENSOR
(OPTIONAL)
AIR SEPARATOR
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
BOILER 1
TEMPERATURE /
PRESSURE GAUGE
Installation & Service Manual
™
F I R E T U B E
Number of Units
2
3
4
Required Pipe Sizes
110
1 1/2"
2"
2"
150
2"
2"
2 1/2"
199
2"
2 1/2"
3"
ZONE #1
ZONE #2
ZONE #3
EXPANSION
TANK
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
CASCADE IS FOR
SPACE HEAT ONLY.
UNION
(TYPICAL)
DIR #2000529699
5
6
7
8
2 1/2" 2 1/2"
3"
3"
3"
3"
3 1/2" 3 1/2"
3"
3 1/2"
4"
4"
ZONE #4
FLOW CHECK
VALVE
(TYPICAL)
ZONE CIRCULATORS
(TYPICAL)
NOTICE:
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