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6 Hydronic piping
Figure 6-7 Multiple Boilers - Multiple Temperatures with DHW Piped as a Zone
DOMESTIC
HOT WATER
CIRCULATOR
ANTI-SCALD
MIXING VALVE
COLD
WATER
IN
AIR SEPARATOR
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE
UP
WATER
HOT
WATER
OUT
BOILER
CIRCULATOR
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
EXPANSION
TANK
MIXING VALVES
(TYPICAL)
FLOW CHECK
VALVE
SYSTEM
SUPPLY
SENSOR
MAY SUBSTITUTE
LOW LOSS HEADER
TEMPERATURE
LOOP #1
TEMPERATURE
LOOP #2
TEMPERATURE
LOOP #3
BOILER
INDIRECT
DHW TANK
UNION
(TYPICAL)
DRAIN
Y-STRAINER
(RECOMMENDED)
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BOILER
TEMPERATURE /
PRESSURE GAUGE
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
Model
Number of Units
2 3 4 5 6 7 8
Required Pipe Sizes
51 1" 1-1/4" 1-1/2" 2" 2" 2" 2"
81 1-1/4" 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2"
106 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 3"
151 2" 2" 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2"
211 2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 4"
42
Installation & Operation Manual
Please note that the installer is responsible for ensuring DHW prioritization when piped as a zone.
NOTICE
CAUTION
Mixing valves are required for the protection of low temperature loops.