Technical data

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