Lennox COWB3 Installation Instructions Manual page 12

Figure 9 - System Piping Arrangement Zoning With Circulators
> CIRCULATOR ON SUPPLY PIPING PUMPS
AWAY FROM EXPANSION TANK
> PIPING ARRANGED FOR "POWER PURGING"
AIR OUT OF SYSTEM PIPING, REFER TO THIS
MANUAL'S SECTION ON "FILLING THE SYS-
TEM WITH WATER" OPTION #1
SYSTEM PIPING
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