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C.2
Control PCB
Note
Note the connection load for all connected external actuators (X11, X13, X14, X15, X17) of a max. total of 2 A.
32
M
31
30
29
33
28
p
27
26
25
1
Control PCB
2
[X40] Edge connector not working
3
[X51] Display edge connector
4
[X35] External current anode edge connector
5
[X26] Coding resistor 1
6
[X24] Coding resistor 2
7
[X31a] eBUS bus connection for optional SR 70B;
SR 71B
8
[X24] Heating flow rate sensor
9
[X24] Coding resistor 3
10
[X41] Edge connector (outdoor temperature sensor,
DCF, system temperature sensor, multi-function
input)
11
[X100/S20] Limit thermostat
8000017440_FT Installation and maintenance instructions
1
2
1 2 3 4 5 6
X40
5
13
4
12
3
11
2
10
1
9
9
18
8
17
7
16
6
15
5
14
4
13
3
12
34
2
11
1
10
10
20
9
19
8
18
7
17
6
16
5
15
4
14
3
13
2
12
1
11
6
12
5
11
12
4
10
3
9
2
8
1
7
3
4
5
1 2 3 4 5 6
1 2 3 4
X31a
X51
X35
3
6
2
5
1
4
2
2
1
N
PE
L
3
N
2
1
24
12
[X100/S21] ESCO contact
13
[X100/BUS] eBUS bus connection (SRC 720, SR 32
bus coupler)
14
[X25] Outdoor unit connection to the Modbus bus
connection
15
[X36] CIM connection for Gateway SR 921, SR 940
16
[X17] External back-up heater
17
[X11] Multi-function output 2: Domestic hot water
circulation pump, anti-legionella pump (max. 13 A, P
= 195 W), dehumidifier, zone valve 2 (max. 0.25 A,
P = 2.5 W)
18
[X16] Internal heating pump
19
[X13] Multi-function output 1: Active cooling relay,
zone valve 1 (max. 0.25 A, P = 2.5 W)
20
[X14] External heating circuit pump (max. 13 A, P =
195 W)
1
2
9
1
10
2
11
3
12
4
13
5
14
6
1
2
15
7
3
16
8
4
5
6
6
5
4
3
1
2
-
eBUS
1
2
+
1
1
2
3
4
5
6
7
L
3
N
2
1
L
3
N
2
1
L
4
S
3
N
2
1
L
4
M
S
3
N
2
1
4
3
L
3
N
2
1
X12
1 2 3
23
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
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