5
EN
BLUEHELIX 25K 50
Water system characteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO
3
), use suitably treated
water in order to avoid possible scaling in the boiler.
Antifreeze kit for outdoor installation (optional)
In case of installation outdoors in a partially protected place for temperatures lower than
-5°C and down to -15°C, the boiler must be equipped with the antifreeze kit to protect the
tap water circuit and air trap. The kit comprises a thermostat, electric heaters and a heat-
er for the air trap. Connect the kit to the electronic card and install the thermostat and
heaters on the tap water pipes as directed in the instructions attached to the kit.
3.4 Gas connection
B
Before making the connection, ensure that the unit is arranged for operation
with the type of fuel available.
The gas must be connected to the relevant connection (see fig. 13) in conformity with the
current standards, using a rigid metal pipe or a continuous surface flexible s/steel tube
and installing a gas cock between the system and boiler. Make sure all the gas connec-
tions are tight.
3.5 Electrical connections
B
The unit must be connected to an efficient earthing system in accordance with
the current safety standards. Have the efficiency and suitability of the earthing
system checked by professionally qualified personnel; the manufacturer de-
clines any liability for damage caused by failure to earth the system.
The boiler is prewired and provided with a "Y" type cable (without plug) for con-
nection to the electric line. The connection to the mains must be permanent and
have a bipolar switch with contact gap of at least 3 mm, interposing fuses of
max. 3A between the boiler and the line. Make sure to respect the polarities
(LINE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green wire) in the
connections to the electric line.
B
The power cable must not be replaced by the user. If the cable is damaged, turn
the unit off and have the cable replaced exclusively by professionally qualified
personnel. In case of replacement, use exclusively
“HAR H05 VV-F”
3x0.75
mm2 cable with maximum ext. diameter of 8 mm.
Room thermostat (optional)
B
IMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE
CONTACTS. CONNECTING 230V TO THE ROOM THERMOSTAT TERMI-
NALS WILL PERMANENTLY DAMAGE THE PCB.
When connecting a time control or timer, do not take the power supply for such
devices from their cutoff contacts. Their power supply must be taken with a di-
rect connection from the mains or with batteries, depending on the type of de-
vice.
Accessing the electrical terminal block
The electrical terminal block (fig. 14) can be accessed after removing the front panel (***
'Opening the front panel' on page 8 ***). The arrangement of the terminals for the various
connections is also given in the wiring diagram in fig. 34.
fig. 14 - Accessing the terminal block
3.6 Fume ducts
Important
The unit is “type C” with sealed chamber and forced draught; the air inlet and fume outlet
must be connected to one of the following extraction/suction systems. Before installation,
check and carefully observe the above prescriptions. Also, comply with the provisions
concerning the positioning of wall and/or roof terminals and the minimum distances from
windows, walls, vents, etc.
Connection with coaxial pipes
Standard connection with coaxial pipes (code 041049G0)
fig. 15 - Standard connection
Other connection with coaxial pipes
fig. 16 - Examples of connection with coaxial pipes (
= Air /
= Fumes)
Table. 2 - Typology
For coaxial connection, fit the unit with one of the following starting accessories. For the
wall hole dimensions, refer to the figure on the cover. Any horizontal sections of the fume
exhaust must be kept sloping slightly towards the boiler, to prevent any condensate from
flowing back towards the outside and causing dripping.
fig. 17 - Starting accessory for coaxial ducts
138
1 2 3 4
A
72
139
Type
Description
C1X
Wall horizontal exhaust and inlet
C3X
Roof vertical exhaust and inlet
Between
10 - 60 mm
Between
10 - 60 mm
320
125
200
80
600
Ø100
125
110
80
600
Ø100
Drill the wall 10 - 20 mm
more than the
pipe diameter
Rear outlet
Side view
Side outlet
Front view
200
400
C
1X
C
1X
C
3X
C
3X
C
3X
C
1X
Ø 100
Ø 60
041001X0
Ø 100
Ø 60
120
142
041002X0
Ø 80
Ø 127
120
147
041006X0
cod. 3541F704 - Rev. 00 - 12/2018
