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Installation & Operation Manual
37
6 Hydronic piping (continued)
EXPANSION TANK
AIR SEPARATOR
PRESSURE REDUCING
VALVE
BACK FLOW
PREVENTER
BALL VALVE
(TYPICAL)
UNION (TYPICAL)
PRESSURE RELIEF
VALVE
FLOW CHECK
VALVE (TYPICAL)
INDIRECT DHW
TANK
BOILER
TEMPERATURE / PRESSURE
GAUGE
PRESSURE GAUGE
DRAIN
DRAIN POINT
(TYPICAL)
BOILER CIRCULATOR
COLD WATER IN
ANTI-SCALD
MIXING VALVE
SYSTEM SUPPLY SENSOR
SYSTEM CIRCULATOR
TO SYSTEM
FROM SYSTEM
DOMESTIC
HOT WATER
CIRCULATOR
HOT WATER OUT
MAKE UP WATER
NOT TO EXCEED 4 PIPE DIAMETERS OR
A MAXIMUM OF 12” APART
Figure 6-7 Single Boiler - Primary/Secondary Piping
NOTICE
System flow should always remain higher than the required flow for the boiler(s) when the boiler(s) is in operation to
prevent short cycling and high limit issues.