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EXTERNAL CONNECTIONS
Connect external connections on terminal blocks X28, X29
and X30 on the base board (AA2).
Sensors
Outside sensor
The outdoor temperature sensor (BT1) is placed in the shade
on a wall facing north or north-west, so it is unaffected, for
example, by the morning sun.
Connect the outdoor temperature sensor to terminal block
AA2-X28:14 and AA2-X29:GND.
If a conduit is used it must be sealed to prevent condensa-
tion in the sensor capsule.
BT1
AA2-X28
9
10
11
12
13
14
AA2-X29
GND
External supply temperature sensor
If an external supply temperature sensor (BT25) needs to
be used, connect it to terminal block AA2-X28:12 and to
terminal block AA2-X29:GND.
BT25
AA2-X28
9
10
11
12
AA2-X29
GND
NIBE S1256
Room sensor
S1256 is supplied with an enclosed room sensor (BT50) that
makes it possible to display and control the room temperat-
ure in the display on S1256.
Fit the room sensor in a neutral position where a set temper-
X28
ature is required. A suitable location might be, for example,
X27
on a free inner wall in a hall approx. 1.5 m above the floor. It
3
2
1
is important that the room sensor is not obstructed from
X29
measuring the correct room temperature, for example by
X30
being located in a recess, between shelves, behind a curtain,
above or close to a heat source, in a draught from an external
AA2
door or in direct sunlight. Closed radiator thermostats can
also cause problems.
S1256 operates without room sensor, but if you want to read
the home's indoor temperature from the display on S1256,
the room sensor must be fitted. Connect the room sensor
to terminal block X28:13 and AA2-X29:GND.
If a room sensor is to be used to change the room temperat-
ure in °C and/or to fine-tune the room temperature, the
sensor must be activated in menu 1.3 - "Room sensor set-
tings".
If a room sensor is used in a room with underfloor heating,
it should only have an indicatory function, not control of the
room temperature.
BT50
10
11
Pulse energy meter
Up to two electricity meters or energy meters for heating
(BE6, BE7) can be connected to S1256 via terminal blocks
AA2-X28:1-2 and AA2-X30:7-8.
AA2-X30
AA2-X28
AA2-X28
12
13
AA2-X29
GND
Caution
Changes of temperature in accommodation take
time. For example, short time periods in combina-
tion with underfloor heating will not give a notice-
able difference in room temperature.
S1256
External
5
6
7
8
9
1
2
3
4
5
Chapter 5 | Electrical connections
+5V
BE7
+5V
BE6
23
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