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Installation & Operation Manual
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
TEMPERATURE /
PRESSURE
GAUGE
UNION
(TYPICAL)
DRAIN
Y-STRAINER
(RECOMMENDED)
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BOILER
Figure 6-7 Multiple Boilers - Multiple Temperatures
Model
Number of Units
2345678
Required Pipe Sizes
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" 3-1/2"
211 2" 2-1/2" 3" 3" 3-1/2" 4" 4"
286 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 5"
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
6 Hydronic piping
CAUTION
Mixing valves are required for the protection of low temperature loops.