Appendix
138
Installation and maintenance instructions aroTHERM plus 0020297937_01
C.3
Wiring diagram, sensors and actuators
X11
X100 / X106
X27
X25
S20
S21
BUS
5
6
3
4
1
2
L
N
M
p
X21
X22
1
7
8
2
9 18
17
16
15
14
13
12
11
10
3
4
5
6
1
2
1
7
8
2
9 19
20
18
17
16
15
14
13
12
11
10
3
4
5
6
X16
3
1
2
L
N
X13
L
N
X15
3
4
1
2
S
L
N
X14
S
L
N
X1
L
N
X24
6
4
3
2
1
5
7
8
9
12
11
10
13
14
15
16
3
1
2
3
1
2
3
4
1
2
3
4
1
2
p
˽
˽
˽
˽
˽
M
˽
˽
˽
3
1
4
2
p
p
2
3
4
6
5
22
23
25
24
21
20
1
7
8
9
19
18
17
16
15
14
13
12
11
10
26
27
1
HMU PCB
2
Actuation for fan 2 (only for product VWL 125/6 and
VWL 155/6)
3
Flow rate sensor
4
Connection to the INSTALLER BOARD PCB
5
Heating pump power supply
6
Crankcase heating
7
4-port diverter valve
8
Condensate tray heater
9
Connection to the INSTALLER BOARD PCB
10
Pressure sensor, in the low-pressure area
11
Pressure sensor, in the heating circuit
12
Temperature sensor, on the heating flow
13
Temperature sensor, on the heating return
14
Temperature sensor, at the air inlet
15
Actuation for fan 1
16
Actuation for the heating pump
17
Temperature sensor, behind the compressor
