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4 Hydronic piping
Installation & Service Manual
Primary / Secondary Piping
Figure 4-8_Multiple Boilers Zoned with Circulators
EXPANSION
TANK
AIR SEPARATOR
PRESSURE
REDUCING
VALVE
BACK FLOW
PREVENTER
BALL VALVE
(TYPICAL)
PRESSURE RELIEF
VALVE
(TYPICAL)
FLOW CHECK
VALVE (TYPICAL)
INDIRECT DHW
TANK
BOILER 1
PRESSURE
GAUGE
DRAIN
( TYPICAL )
DRAIN POINT
(TYPICAL)
COLD WATER IN
HOT WATER OUT
MAKE UP WATER
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
TEMPERATURE
LOOP 1
TEMPERATURE
LOOP 2
TEMPERATURE
LOOP 3
BOILER 2
T
O
S
Y
S
T
E
M
F
R
O
M
S
Y
S
T
E
M
DOMESTIC
HOT WATER
CIRCULATOR
BOILER CIRCULATOR
TEMPERATURE /
PRESSURE GAUGE
( TYPICAL)
UNION (TYPICAL)
ANTI-SCALD
MIXING VALVE
SYSTEM SUPPLY
SENSOR
( WHEN USED )
PRESSURE
RELIEF
VALVE
MAY
SUBSTITUTE LOW
LOSS HEADER
NOT EXCEED
12" APART
DRAIN
FLOW CHECK
VALVE
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