34
A3
A2
A1
V3
V2
V1
A2
A3
V2
V3
A1
V1
35
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
Total head available to the system.
Ci
rcu
la
to
r p
um
p a
bs
or
be
d p
ow
er (
W
)
Ci
rcu
la
to
r p
um
p a
bs
or
be
d p
ow
er (
W
)
Flow rate (l/h)
Flow rate (l/h)
H
ea
d (kP
a)
H
ea
d (kP
a)
Closed bypass
Open bypass
Key:
V1 = Total head available to the system with pump at speed 1
V2 = Total head available to the system with pump at speed 2
V3 = Total head available to the system with pump at speed 3
A1 = Power absorbed by the pump at speed 1
A2 = Power absorbed by the pump at speed 2
A3 = Power absorbed by the pump at speed 3
