Appendix
0020258016_01 ecoTEC pure Installation and maintenance instructions
41
E.2
Connection diagram, product with heating mode only
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
X20
X40
X51
X30
X2
X21
X41
X22
X14
L
N
– +
24V=
RT
BUS
Burner
off
X1
FUS
X106
X32
X90
X12
X35
X1
L
N
X21
4
1
3
2
eBUS
6
5
4
3
2
1
RT 24V
Burner off
X106
X41
1
3
4
1
3
3
1
2
M
1
3
4
6
1
2
3
M
5
4
2
1
2
1
2
1
N
L
24V
230V~
24V
230V~
2
11
12
13
15
1
7
8
3
4
5
9
10
14
17
16
6
1
Main PCB
2
Interface PCB
3
Safety thermostat for underfloor heating
4
24 V DC room thermostat
5
Bus connection (digital room thermostat/controller)
6
Outside temperature sensor, wired
7
Temperature sensor in the heating return
8
Temperature sensor in the heating flow
9
Fan
10
Gas valve
11
Diverter valve
12
Pressure sensor
13
Plug, cylinder, hot water heat exchanger
14
External ignition device
15
Ionisation and ignition electrode
16
Heating pump
17
Main power supply
