Immergas 3.020857, Instruction Booklet And Warning

Page: 8 / 28

8
1-6
A
B
C
D
INS
TALL
AT
O
R
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
1.11 SYSTEM FILLING.
Once the boiler is connected, fill the system via
the filling valve (Fig. 2-2). Filling is performed
at low speed to ensure release of air bubbles in
the water via the boiler and heating system vents.
The boiler has a built-in automatic venting valve
on the circulator. Open the radiator vent valves.
Close radiator vent valves only when water es-
capes from them.
Close the filling valve when the boiler manometer
indicates approx. 1.2 bar.
N.B.:
during these operations start up the cir-
culation pump at intervals, acting on the main
switch positioned on the control panel. Vent the
circulation pump by loosening the front cap and
keeping the motor running.
Tighten the cap after the operation.
1.12 GAS SYSTEM START-UP.
To start up the system, refer to the technical
standard in force: In particular, for new gas
systems:
- open windows and doors;
- avoid presence of sparks or naked flames;
- bleed all air from pipelines;
- check that the internal system is properly sealed
according to specifications.
1.13 BOILER START UP (IGNITION).
To commission the boiler (the operations listed
below must only be performed by a qualified firm
and without any unauthorised persons):
- check that the internal system is properly sealed
according to specifications
- make sure that the type of gas used corresponds
to boiler settings;
- check that there are no external factors that
may cause the formation of fuel pockets;
- switch the boiler on and check correct ignition;
- make sure that the gas flow rate and relevant
pressure values comply with those given in the
manual (par. 3.18);
- check the correct ventilation of the rooms;
- check the existing draught during normal
functioning of the appliance, e.g. a draught
gauge positioned at the exit of the appliance
combustion products;
- check that there is no backflow of combustion
products into the room, even during function-
ing of fans;
- ensure that the safety device is engaged in the
event of gas supply failure and check activation
time;
- check activation of the main switch located
upstream from the boiler.
The boiler must not be started up even if only
one of the checks should be negative.
1.14 CIRCULATION PUMP.
The Mini Nike X 24 3 E series boilers are supplied
with a built-in circulation pump with 3-posi-
tion electric speed control. The boiler does not
operate correctly with the circulation pump on
first 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. The pump is already fitted
with a condenser.
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. 20 Fig. 1-7). If neces-
sary, 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. 1-6).
Make the regulation using a flat head screw-
driver, turn clockwise and insert the by-pass,
anti-clockwise it is excluded.
Total head available to the system.
To
ta
l h
ea
d (m H
2
O)
Flow rate (l/h)
H
ea
d (kP
a)
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.
1.15 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.
• 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.
• 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.