Amtrol OWB Series - Manual (Page 32)

11. MULTIPLE BOILER PIPING- REVERSE RETURN FLOW WITH BLEND
PUMP
Figure 28.
Check Valve
System
Supply
System
Circulator
Pressure
Reduction
Valve
Air Separator
Amtrol #720 Air
Eliminator or Equal
Backflow
Preventer
*Blend Pump
S
S R
R
*Blend Pump
Check Valve
From
City
Water
Supply
Expansion Tank
System
Return
32
Installation, Operation, And Service Instructions