Dunkirk EMPIRE 3EWC0.80 Installation, Operation & Maintenance Manual page 14

Figure 10 - System Piping Arrangement Alternate Near Boiler Piping
> DIAPHRAGM EXPANSION TANK MOUNTED
OFF THE BOILER
> CIRCULATOR ON SUPPLY PIPING PUMPS
AWAY FROM EXPANSION TANK
SYSTEM PIPING
> PER THIS MANUAL, USE OPTION #2 IN
"FILLING THE SYSTEM WITH WATER"
> THIS PIPING ARRANGEMENT CAN BE USED
WITH ZONE VALVES OR ZONE
CIRCULATORS
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PN 240013012, Rev. B [12/15/2020]