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Air
Se
p
arato
r
System
Su
pp
l
y
Amtrol #720 Air
Eliminator or E
q
ual
System
Circulato
r
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 Pum
p
Check Valve
Syste
m
Return
Pressure
Reduction
Valve
Backflow
Prevente
r
From City
Water Su
pp
l
y
To Size Blend
Pum
p
See Table 3
Ex
p
ansion Tan
k
Secondary
P
u
m
p
Check Valve
System
Su
pp
l
y
System
Circulato
r
Pressure
Reduction
Valve
Backflow
Prevente
r
Ex
p
ansion Tan
k
Secondary
P
u
m
p
Check Valve
R
Air Se
p
arato
r
12” MAX
12” MAX
Amtrol #720 Air
Eliminato
r
or E
q
ual
From
City
Water
Su
pp
l
y
S
S
R
Syste
m
Return
Installation, Operation, And Service Instructions 31