Vaillant ecoTEC plus VUI Series Installation And Maintenance Instructions Manual page 89

2
X40 X51
X90
1
U2
2
X12a X1
RT
L N L N
3
L N
23
1 Main PCB
2 Control panel PCB
3 Shift-load cylinder
4 Gas valve assembly
0020308121_04 Installation and maintenance instructions
X51
X51
X31
X20
X35
X21
X25
X26
X24
X2
X100
X23
X16
X11
X19
1
X1
F1
X12a X12b
X19
X11
N L N L
22
1
X31
3
5
2
1
8
X25
9
7
3
11
12
2
4
10
12
18
13
X20
17
3
14
15
6
7
8
Burner
Off
24V=
X100
RT
-
BUS
+
9
1
14
13
11
18
7
X2
17
8
3
2
6
1
5
3
X23 5
4
1
X24
1
2
1
2
3
X41
4
5
6
6
5
4
X36
3
2
1
3
X26
2
1
24V
230V~
L
X16
N
5 Fan
6 Gas valve assembly for main gas valve
7 Return temperature sensor
8 Flow temperature sensor
2
3
3
4
1
2
3
4
4
5
6
1 +24V
2 RPM
3 5
4 PWM
5 GND
1
6
3
7
8
9
10
11
1
12
3
4
1
3 13
M
4
6
14
1 b
2
3
4 a
15
16
1
17
2
3
4
5
18
6
4
1
2
3 19
5
2
3
4
20
1
6
21
89