17
A
B
C
D
INSTALLERUSER
MAINTENANCE TECHNICIAN
Head (m H
2
O)
Flow rate (l/h)
Head (kPa)
Head available to the system.
A = Head available to the system at
maximum speed with by-pass
excluded.
B = Head available to the system at
maximum speed with by-pass
inserted.
C = Head available to the system
at second speed with by-pass
excluded.
D = Head available to the system
at second speed with by-pass
inserted.
A
B
C
D
1.20 CIRCULATION PUMP.
The boilers are supplied with a built-in
circulation pump with 3-position electric speed
control. e boiler does not operate correctly
with the circulation pump on rst speed. To
ensure optimal boiler operation, in the case
of new systems (single pipe and module) it is
recommended to use the pump at maximum
speed. e circulation pump is already tted
with a capacitor.
Pump release. If, aer a prolonged period of
inactivity, the circulation pump is blocked,
unscrew the front cap and turn the motor sha
using a screwdriver. Take great care during this
operation to avoid damage to the motor.
By-pass Regulation (part. 25 Fig. 1-30). If
necessary, the by-pass can be regulated according
to system requirements from a minimum (by-
pass excluded) to a maximum (by-pass inserted)
represented by the graphics (Fig. 1-29). Make the
regulation using a at head screwdriver, turn
clockwise and insert the by-pass, anti-clockwise
it is excluded.
1.21 KITS AVAILABLE ON REQUEST.
• System cut-o valves kit. e boiler is designed
for installation of system interception cocks
to be placed on ow and return pipes of the
connection assembly. is kit is particularly
useful for maintenance as it allows the boiler to
be drained separately without having to empty
the entire system.
• Polyphosphate dispenser kit. e polyphosphate
dispenser reduces the formation of lime-scale
and preserves the original heat exchange and
domestic hot water production conditions.
e boiler is prepared for application of the
polyphosphate dispenser kit.
• Covering kit. If installed outdoors in a
partially sheltered place with direct air intake,
it is compulsory to mount the appropriate top
protection cover for the correct functioning of
the boiler and to protect it from adverse weather
conditions (Fig. 1-10); or, if installed indoors in
conguration type B, it is compulsory to mount
the appropriate top protection cover along with
the ue exhaust kit.
• Anti freeze kit with resistance (on request).
If the boiler is installed in a place where the
temperature drops below -5°C and if the gas
supply fails, the appliance may freeze. To
prevent freezing of the domestic hot water
system, an anti freeze kit with an electrical
resistance can be tted from the relative cable
and from a control thermostat.
e above-mentioned kits are supplied complete
with instructions for assembly and use.
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