Dunkirk EXCELSIOR EXB4075 Installation, Operation & Maintenance Manual page 30

Figure 26 Bypass Piping (Fixed Low Temperature Only)
Adjust two throttling valves to maintain at least 130°F - 140°F in boiler return.
TO SYSTEM
SYSTEM
CIRCULATOR
WATER INLET
Figure 25 - Bypass Piping Automatic Mixing Valve
TO SYSTEM
WATER INLET
EXPANSION
10 - HYDRONIC PIPING
V1
EXPANSION
TANK
PRESSURE
CIRCULATOR
REDUCER VALVE
SHUT-OFF
CHECK VALVE
VALVE
TANK
PRESSURE
V2
BOILER
BALL VALVE
ZONE VALVE
BOILER
30
FROM SYSTEM
ALTERNATE
CIRCULATOR
LOCATION
AIR SEPARATOR
FROM SYSTEM
ALTERNATE
CIRCULATOR
LOCATION