17
1-28
A
B
C
D
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.16 CIRCULATION PUMP.
e boilers are supplied with a built-in circula-
tion pump with 3-position electric speed control.
e boiler does not operate correctly with the
circulation pump on rst speed. To ensure opti-
mal boiler operation, in the case of new systems
(single pipe and module) it is recommended to
use the pump at maximum speed. e pump is
already tted with a condenser.
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. 1-29). If neces-
sary, the by-pass can be regulated according to
plant requirements from a minimum (by-pass
excluded) to a maximum (by-pass inserted)
represented by the following graphics (Fig. 1-28).
Make the regulation using a at head screwdriver,
turn clockwise and insert the by-pass, anti-
clockwise it is excluded.
1.17 KITS AVAILABLE ON REQUEST.
• System shut 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 polyphos-
phate 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.
• Cover kit. For outdoor installations, in partially
protected areas and with direct air intake, the
top protection cover must be tted for a correct
functioning of the boiler and to protect it from
storms (Fig. 1-7). For indoor installations, type
B conguration, a suitable top protection cover
coupled with the ue exhaust kit must be tted.
• Anti freeze kit with resistance (on request). If
the boiler is installed in a place where the tem-
perature falls below -5°C and in the event there
is no gas, the appliance can 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.
Head (m H
2
O)
Flow rate (l/h)
Head (kPa)
Total 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.
To Next Page
Loading...
