85
Solutions for centralized heating systems installations
The figure shows the wiring diagram of the connectors to the circuit board of the boiler. The sensors and functional components
of the generator are controlled by the circuit board to which they are connected by the internal connectors shown in the figure.
Wiring diagram
M1
3
2
1
4
5
6
7
8
12
14
15
16
18
17
19
20
21
11
10
COLOURS OF
THE CABLES:
C= Blue
M= Brown
N= Black
R= Red
G/V=Yellow/Green
V=Green
B=White
G=Grey
Y=Yellow
P=Violet
9
X10
X11
X12
X13
X14
X1
X2
X23
X70
X60
X22
X50
X42
X41
X40
X30
X21
X20
B
N
R
R
B
N
C
C
V
N
R
C
C
R
R
C
C
V
R
N
C
C
R
R
M
N
C
M
V
N
C
M
V
N
N
V
M
C
C
C
C
C
V
N
M
C
M
C
M
C
G/V
G/V
G/V
G/V
G/V
G/V
G/V
G/V
G/V
G/V
G/V
1
15
G/V
G/V
G/V
Y
P
M
M
P
Y
FUSIBILI
L
N
1
2
FUSIBILI
M
C
G/V
G/V
G/V
M
N
N
M
M
C
M
C
M
C
M
C
M
V
N
N
V
M2
V
V
22
V
V
B
R
N
13
b
a
10
9
8
7
6
5
4
3
2
1
7
6
5
4
3
2
1
M3
1 Pump with air separator
9 Hydraulic pressure sensor
17 Coaxial connector
2 Boiler drain tap
10 3-way valve with motor
18 Water-fumes exchanger
3 Pressure gauge
11 Non-return valve
19 Ignition electrode
4 Hydraulic safety valve
12 DHW heat exchanger
20 Burner
5 Boiler filling tap
13 Gas valve
21 Flame detection electrode
6 Flow sensor with water filter and flow limiting device
14 Safety thermostat
22 Air/gas blend manifold
7 DHW priority sensor
15 NTC heating sensor (flow/return)
23 Fan
8 NTC DHW sensor
16 Fumes sensor
