Appendix
38
Installation and maintenance instructions HOME 0020224355_00
E
Connection diagram: Combination unit
X2
X14
L
N
19
10
20
2
6
3
11
13
14
18
7
17
8
X51
X51
X20
16
1
9
3
15
4
5
10
11
6
13
X51
X35
X20
X40
X51
X30
X2
X21
X41
X22
X14
L
N
– +
24V=
RT
BUS
Burner
off
RT
230Vac
X1
FUS
X106
X32
X90
X12
X35
X1
X21
L
N
RT 230Vac
L
N
X35
1
3
4
1
3
3
1
2
M
1
3
4
6
1
2
3
eBUS
Burner off
X106
M
5
4
2
1
2
1
2
1
N
L
L
24V
230V~
24V
230V~
2
8
9
10
11
13
12
1
5
4
3
6
7
15
14
1
Main PCB
2
Interface PCB
3
Timer
4
Control system
5
Temperature sensor in the heating flow
6
Temperature sensor in the heating return
7
Fan
8
Gas valve
9
3-way valve
10
Pressure sensor
11
Volume flow sensor
12
Ionisation electrode
13
Heating pump
14
Ignition electrode
15
Main power supply
Summary of Contents for home combi
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