32
B
A
C
D
33
INS
T
ALLER
US
ER
M
A
I
N
T
E
N
A
N
C
E
T
E
C
H
N
IC
IA
N
Head available to the system.
H
ea
d (kP
a)
A+B = Head available with bypass closed
B = Head available with bypass open
C+D = Power absorbed by the pump with by-pass open (dotted area)
D = Power absorbed by the pump with bypass closed (dotted area)
C
ir
cu
la
to
r p
u
m
p a
bs
or
be
d p
ow
er (
W
)
Flow rate (l/h)
Speed 9
Speed 9
Spe
ed 6
N.B.:
the graph shows the head available to the system with cycloidal filter unit installed.
Pump release.
If after a long period of inactivity, the circulator
is blocked, adjust the screw in the centre of the head in order
to manually release the motor shaft. Take great care during this
operation to avoid damage to the motor.
Bypass Regulation (Part. 25 Fig.33).
N.B.:
the bypass ensures minimum circulation of the water in the
boiler and correct operation of the appliance if the systems are
divided into more than one zone.
The boiler leaves the factory with the bypass open.
If necessary, the bypass can be regulated to system requirements
from minimum (bypass closed) to maximum (bypass open). Ad-
just using a flat-head screwdriver. Turning clockwise opens the
bypass and anticlockwise closes it.
