Nibe S1155 - Page 22

EXTERNAL CONNECTIONS
External connections are connected on terminal blocks
X28, X29 and X30 on the PCB (AA2).
-X29
-X28
0-5V 1
+5V 2
AUX1 3
AUX2 4
AUX3 5
AUX4 6
AUX5 7
AUX6 8
AUX7 9
AUX8 10
BT6 11
BT25 12
1
1 2 3
2
3
4
5
6
7
8
9
10
11
12
GND
+12V
B
A
OT+
OT−
0-5V
PWM0
PWM1
CPU
EXT COM
INT COM
ERROR
POWER
+5V
GND
BE1
BE2
BE3
K10
-X2
7
NO
O
NC
A
UX-RE
LAY
BT50 13
BT1 14
-X30
X30
X29
X28
AA2
X27
Sensors
Outside sensor
The outdoor sensor (BT1) is placed in the shade on a
wall facing north or north-west, so it is unaffected e.g.
by the morning sun.
The outdoor sensor is connected to terminal block AA2-
X28:14 and to any input on terminal block AA2-X29.
If a conduit is used it must be sealed to prevent condens-
ation in the sensor capsule.
13
12
11
10
14
BT50
BT25
BT6
AUX8
BT1
BT1
AA2-X28
AA2-X29
Temperature sensor, hot water charging
The temperature sensor, hot water charging (BT6) is
placed in the submerged tube on the water heater.
Connect the sensor to terminal block AA2-X28:11 (or to
one of the selectable AUX inputs) and to any input on
terminal block AA2-X29.
Settings for hot water are made in menu 2 "Hot water".
10
9
8
7
11
AUX6
AUX5
BT6
AUX8
AUX7
BT6
AA2-X28
AA2-X29
Temperature sensor, hot water top
A temperature sensor for hot water top (BT7) can be
connected to S1155 to show the water temperature at
the top of the tank (if it is possible to install a sensor at
the top of the tank).
Connect the sensor to terminal block X28:10 (or to one
of the other selectable AUX inputs) and to any input on
terminal block AA2-X29.
9
8
7
6
10
AUX6
AUX5
AUX4
AUX8
AUX7
BT7
AA2-X28
AA2-X29
Temperature sensor, external flow line
If a temperature sensor, external supply line (BT25)
needs to be used, connect it to terminal block AA2-
X28:12 and to any input on terminal block AA2-X29.
13
12
11
10
14
BT50
BT25
BT6
AUX8
BT1
BT25
AA2-X28
AA2-X29
NIBE S1155Chapter 5 | Electrical connections22