Immergas 3.020928, Инструкция и рекомендации, Страница: 17 / 36

17
1-29
A
B
C
D
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
H
ea
d (m H
2
O)
Flow rate (l/h)
H
ea
d (kP
a)
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
1.19 KITS AVAILABLE ON REQUEST.
• System shut off valves kit. The boiler is designed
for installation of system interception cocks
to be placed on flow and return pipes of the
connection assembly. This kit is particularly
useful for maintenance as it allows the boiler to
be drained separately without having to empty
the entire system.
• System zone control unit Kit. If the heating
system is to be divided into several zones
(max.
three), in order to interlock them with separate
adjustments and to keep water flow rate high
for each zone, Immergas supplies zone system
kits by request.
• Polyphosphate dispenser kit. The polyphos-
phate dispenser reduces the formation of lime-
scale and preserves the original heat exchange
and domestic hot water production conditions.
The boiler is prepared for application of the
polyphosphate dispenser kit.
• Cover kit. If installed outdoors in a partially
sheltered place with direct air intake, it is
compulsory to mount the appropriate top pro-
tection cover for the correct functioning of the
boiler and to protect it from adverse weather
conditions (Fig. 1-6); or, if installed indoors in
configuration type B, it is compulsory to mount
the appropriate top protection cover along with
the flue exhaust kit.
Anti freeze kit with resistance (on request). If the
boiler is installed in a place where the tempera-
ture 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 fitted from the relative cable and from a
control thermostat.
• External storage tank unit coupling kit. If the
production of DHW is required as well as room
central heating, on request Immergas supplies
a kit made up from an external cylinder unit
and everything necessary for adaptation of the
boiler
The above-mentioned kits are supplied complete
with instructions for assembly and use.
1.18 CIRCULATION PUMP.
The boilers are supplied with a built-in circula-
tion pump with 3-position electric speed control.
The boiler does not operate correctly with the
circulation pump on first 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. The circulation
pump is already fitted with a capacitor.
Pump release.
If, after a prolonged period of
inactivity, the circulation pump is blocked,
unscrew the front cap and turn the motor shaft
using a screwdriver. Take great care during this
operation to avoid damage to the motor.
By-pass Regulation (part. 25 Fig. 1-30).
If nec-
essary, the by-pass can be adjusted according to
system requirements from a minimum (by-pass
excluded) to a maximum (by-pass inserted)
represented by the graph (Fig. 1-29). Make the
regulation using a flat head screwdriver, turn
clockwise and insert the by-pass, anti-clockwise
it is excluded.