Lochinvar WH 55-399 Installation & Operation Manual page 39

6
Hydronic piping
Figure 6-4 Single Boiler - Single Temperature with Zone Valves - DHW Priority
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP
WATER
SYSTEM SUPPLY SENSOR
AIR SEPARATOR
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
BOILER
CIRCULATOR
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.
(continued)
ZONE #1
PRESSURE
GAUGE
SYSTEM
CIRCULATOR
EXPANSION
TANK
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
Y-STRAINER
(RECOMMENDED)
PRESSURE
RELIEF VALVE
UNION
(TYPICAL)
TEMPERATURE /
PRESSURE
Installation & Operation Manual
ZONE #2
ZONE #3
DOMESTIC
FLOW CHECK
HOT WATER
VALVE
CIRCULATOR
BOILER
DRAIN
GAUGE
ZONE #4
ZONE VALVES
(TYPICAL)
DIFFERENTIAL
PRESSURE
BYPASS VALVE
(RECOMMENDED)
HOT
WATER
OUT
ANTI-SCALD
MIXING VALVE
COLD
WATER
IN
INDIRECT
DHW TANK
39