Room sensor
S1155 is supplied with an enclosed room sensor (BT50)
that makes it possible to display and control the room
temperature in the display on S1155.
Fit the room sensor in a neutral position where a set
temperature is required. A suitable location might be,
for example, on a free inner wall in a hall approx. 1.5 m
above the floor. It is important that the room sensor is
not obstructed from measuring the correct room tem-
perature, for example by being located in a recess,
between shelves, behind a curtain, above or close to a
heat source, in a draught from an external door or in
direct sunlight. Closed radiator thermostats can also
cause problems.
S1155 operates without room sensor, but if you want
to read the home’s indoor temperature from the display
on S1155, the room sensor must be fitted. The room
sensor is connected on terminal block X28:13 and to
any input on terminal block AA2-X29.
If a room sensor is to be used to change the room
temperature in °C and/or to fine-tune the room temper-
ature, the sensor must be activated in menu 1.3 "Room
sensor settings".
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.
13
12
11
10
14
BT50
BT25
BT6
AUX8
BT1
BT50
AA2-X28
AA2-X29
Caution
Changes of temperature in accommodation
take time. For example, short time periods in
combination with underfloor heating will not
give a noticeable difference in room temperat-
ure.
External energy meter
One or two energy meters (BE6, BE7) are connected to
AA2-X28:1-2 or AA2-X30:7-8.
0-5V
+5V
AUX 1
AUX 2
OT+
0-5V
+5V
GND
AA2-X30
AA2-X28
1
4
3
2
BE6
BE7
6
9
8
7
+5V
+5V
Activate the energy meter(s) in menu 7.2 and then set
the desired value ("Energy per pulse" or "Pulses per
kWh") in menu 7.2.19.
Load monitor
Integrated load monitor
S1155 is equipped with a simple form of integrated load
monitor, which limits the power steps for the electric
additional heat by calculating whether future power
steps can be connected to the relevant phase without
exceeding the specified main fuse. If the current would
exceed the specified main fuse, the power step is not
permitted. The size of the property’s main fuse is spe-
cified in menu 7.1.9.
Load monitor with current sensor
When many power-consuming products are connected
in the property at the same time as the electric additional
heat is operating, there is a risk of the property’s main
fuses tripping. S1155 is equipped with a load monitor
which, with the aid of a current sensor, controls the
power steps for the electric additional heat by redistrib-
uting the power between the different phases or by
disengaging the electric additional heat in event of an
overload in a phase. If the overload remains despite the
electric additional heat being disengaged, the com-
pressor winds down. Reconnection occurs when the
other current consumption drops.
Caution
Activate phase detection in menu 7.1.9 for full
functionality, if current sensors are installed.
Connecting current sensors
A current sensor should be installed on each incoming
phase conductor in to the distribution box to measure
the current. The distribution box is an appropriate install-
ation point.
Connect the current sensors to a multi-core cable in an
enclosure directly adjacent to the electrical distribution
unit. The multi-core cable between the enclosure and
S1155 must have a cable area of at least 0.5 mm².
Electrical
distribution unit
NIBE product
Incoming electricity
23Chapter 5 | Electrical connectionsNIBE S1155
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