Dunkirk EXCELSIOR Series Installation, Operation & Maintenance Manual page 19

Figure 17 - Standard Near Boiler Piping
TO SYSTEM
EXPANSION TANK
BOILER
CONTROL
FROM SYSTEM
FRONT
OF
BOILER
;TEMPERATURE
PRESSURE
DRAIN
Piping Diagram Legend
HOSE BIB
J LOW CONTROL
VAVLE
DRAIN
VALVE
PRESSURE
RELIEF
VALVE
CIRCULATOR _ PRESSUREREDUCER VALVE _ BALL'v;ALVE
AiR SEPARATOR
SHUT-OFF _'---_.J CHECK VALVE _ ZONE VALVE
VALVE