*****INTERNAL*****30 R_D proof- 26.10.2022 / 09:15:46- VaillantGroup\DOC-agt\Brand\VIH_QW_190_6\ENG\OI-II_GB_0020291525
0020291525_04 Installation and maintenance instructions 47
C Control PCB
X11
X100 /
X106
S20
S21
BUS
5
6
3
4
1
2
L
N
X21
X22
1
7
8
2
918
17
16
15
14
13
12
11
10
3
4
5
6
X28
1
2
7
8
9
11
10
12
3
4
5
6
1
7
8
2
919
20
18
17
16
15
14
13
12
11
10
3
4
5
6
X16
X41
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
˽
eBUS
+
-
M
3
6 5 4 3 2 1
p
˽
12
1
2
3
4
5
6
2
1
X51
X29
1
2
DCF
0
0
FB
AF
RF
2
1
4321
2
1
X35
12
10
9
8
13
14
16
15
19
18
6
7
20
21
11
17
1 2
5
3 4
1 Control PCB
2 [X29] eBUS bus connection for the installed system
control
3 [X51] Display edge connector
4 [X35] External current anode edge connector
5 [X24] Coding resistor 3
6 [X24] Coding resistor 2
7 [X41] Edge connector (outdoor temperature sensor,
DCF, system temperature sensor, multi-function
input)
8 [X106/S20] Limit thermostat
9 [X106/S21] ESCO contact
10 [X106/BUS] eBUS bus connection (outdoor unit,
VRC 700, VR 70 / VR 71 )
11 [X16] Optional: Accessory (intermediate heat ex-
changer pump)
12 [X15] Internal prioritising diverter valve for heating
circuit/cylinder charging
13 [X11] Multi-function output 2: Domestic hot water
circulation pump, anti-legionella pump, dehumidifier,
zone valve
14 [X13] Multi-function output 1: Cooling valve, zone
valve
15 [X14] Multi-function output: External back-up heater,
external prioritising diverter valve, external fault
message
16 [X1] 230 V supply for control PCB
17 [X1] Functional earth
18 [X28] Data connection to the power supply PCB
19 [X22] Immersion heater flow temperature sensor
20 [X22] Optional: Accessory (building circuit pressure
sensor for optional intermediate heat exchanger)
21 [X22] Domestic hot water cylinder temperature
sensor
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