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Connection to a storage tank for domestic hot water production
The unit's electronic board is arranged for managing an external storage tank for domes-
tic hot water production. Make the plumbing connections according to the diagram of
fig. 14. Make the electrical connections as shown on the wiring diagram in fig. 32. It is
necessary to use the kit code 1KWMA11W. At the next lighting, the boiler's control sys-
tem recognises the presence of the hot water tank probe and is automatically configures
the DHW function, activating the display and relevant controls.
10
11
fig. 14 - Diagram of connection to an external hot water tank
8
Domestic hot water outlet
9
Cold water inlet
10
System delivery
11
System return
95
Diverter valve
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
current safety standards. Have the efficiency and suitability of the earthing sys-
tem checked by professionally qualified personnel; the Manufacturer declines
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 connections to the grid must be made with a per-
manent connection and equipped with a bipolar switch whose contacts have a
minimum opening 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 / NEU-
TRAL: blue wire / EARTH: yellow-green wire) in the connections to the electric
line.
B
The unit's power cable must not be replaced by the user. If the cable gets dam-
aged, switch off the unit and have it replaced only 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 de-
vices from their cutoff contacts. Their power supply must be taken with a direct con-
nection from the mains or with batteries, depending on the type of device.
Accessing the electrical terminal block
The electrical terminal block (fig. 15) can be accessed after removing the front panel (***
'Opening the front panel' on page 51 ***). The layout of the terminals for the various con-
nections is also given in the wiring diagram in fig. 32.
9
8
95
3.6 Fume ducts
Important
The unit is a "C type" with sealed chamber and forced draught; the air inlet and fume out-
let must be connected to one of the following extraction/suction systems. Before instal-
lation, check and carefully follow the instructions. Also, comply with the provisions on the
positioning of wall and/or roof terminals and the minimum distances from windows, walls,
ventilation openings, etc.
For the possible outlet configurations and installation distances, refer to table 7 and table 8.
Connection with coaxial pipes
Table. 2 - Typology
For coaxial connection, fit the unit with one of the following starting accessories. Any horizon-
tal 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.
Table. 3 - Max. length of coaxial pipes
72
139
fig. 15 - Accessing the terminal block
fig. 16 - Examples of connection with coaxial pipes (
Type
Description
C1X
Wall horizontal exhaust and inlet
C3X
Roof vertical exhaust and inlet
041001X0
fig. 17 Starting accessories for coaxial ducts
Max. permissible length (horizontal)
Max. permissible length (vertical)
Reduction factor 90° bend
Reduction factor 45° bend
1
2
3
95
1.8 k
10 k
155
A
138
1
2
3
4
5
= Air /
= Fumes)
Coaxial 60/100
Coaxial 80/125
7 m
28 m
8 m
1 m
0.5 m
0.5 m
0.25 m
6
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