Air
Separator
System
Supply
Amtrol #720 Air
Eliminator or Equal
System
Circulator
S
R
Figure 26.
10.
SINGLE OR MULTIPLE BOILER PIPING FOR PRIMARY/SECONDARY
PUMPING
Size Secondary Pump GPM at Gross Boiler Output for 20” Drop. When Calulating
Pump Head, the Maximum Boiler Resistance for any Boiler will not Exceed 14 in.
W.C. Head.
Figure 27.
Blend Pump
Check Valve
System
Return
Pressure
Reduction
Valve
Backflow
Preventer
From City
Water Supply
To Size Blend
Pump See Table 3
Expansion Tank
Secondary
Pump
Check Valve
System
Supply
System
Circulator
Pressure
Reduction
Valve
Backflow
Preventer
Expansion Tank
Secondary
Pump
Check Valve
R
Air Separator
12” MAX
12” MAX
Amtrol #720 Air
Eliminator or Equal
From
City
Water
Supply
S
S
R
System
Return
Installation, Operation, And Service Instructions
31
