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 gets damaged,
switch off the unit and have it changed by professionally qualified personnel. If
replacing the power cable, only use
“HAR H05 VV-F”
3x0.75 mm2 cable with
max. external diameter 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 40 ***) . The arrangement of the terminals for the var-
ious connections is also given in the wiring diagram in fig. 29.
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
fig. 15 - 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 possible condensate
from flowing back towards the outside and causing dripping.
fig. 16 - Starting accessory for coaxial ducts
Table. 3 - Max. length of coaxial pipes
Type
Description
C1X
Wall horizontal exhaust and inlet
C3X
Roof vertical exhaust and inlet
138
1 2 3 4
A
72
139
C
1X
C
1X
C
3X
C
3X
C
3X
C
1X
Coaxial 60/100
Coaxial 80/125
Max. permissible length
(horizontal)
7 m
28 m
Max. permissible length
(vertical)
8 m
Reduction factor
90° bend
1 m
0.5 m
Reduction factor
45° bend
0.5 m
0.25 m
Ø 100
Ø 60
041001X0
Ø 100
Ø 60
120
142
041002X0
Ø 80
Ø 127
120
147
041006X0
39
EN
BLUEHELIX PRO S 32C
cod. 3541F842 - Rev. 00 - 11/2018
Summary of Contents for BLUEHELIX PRO S 27C
Page 91: ......
