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11. MULTIPLE BOILER PIPING- REVERSE RETURN FLOW WITH BLEND
PUMP
Figure 28.
Check Valve
System
Su
pp
l
y
System
Circulato
r
Pressure
Reduction
Valve
Air Se
p
arato
r
Amtrol #720 Air
Eliminator or E
q
ual
Backflow
Prevente
r
*Blend Pump
S
S
R
R
*Blend Pum
p
Check Valve
From
City
Water
Su
pp
l
y
Ex
p
ansion Tan
k
Syste
m
Return
32
Installation, Operation, And Service Instructions