Room sensor
S1155PC is supplied with an enclosed room sensor (BT50)
that makes it possible to display and control the room tem-
perature in the display on S1155PC.
Fit the room sensor in a neutral position where a set temper-
ature 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 temperature, 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.
S1155PC operates without room sensor, but if you want to
read the home’s indoor temperature from the display on
S1155PC, 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.
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 combina-
tion with underfloor heating will not give a notice-
able difference in room temperature.
Pulse energy meter
Up to two electricity meters or energy meters for heating
(BE6, BE7) can be connected to S1155PC via terminal blocks
AA2-X28:1-2 and AA2-X30:7-8.
S1155PC
External
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 meter(s) in menu 7.2 - "Accessory settings"
and then set the desired value ("Energy per pulse" or "Pulses
per kWh") in menu 7.2.19 -"Pulse energy meter".
Load monitor
Integrated load monitor
S1155PC is equipped with a simple form of integrated load
monitor, which limits the power steps for the electric addi-
tional heat by calculating whether future power steps can
be connected to the relevant phase without exceeding the
current for the specified main fuse. In those cases where
the current would exceed the specified main fuse, the power
step is not permitted. The size of the property’s main fuse
is specified in menu 7.1.9 - "Load monitor".
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. S1155PC is equipped with a load monitor which,
with the aid of a current sensor, controls the power steps
for the electric additional heat by redistributing 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 compressor 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 installation point.
Connect the current sensors to a multi-core cable in an en-
closure directly adjacent to the electrical distribution unit.
The multi-core cable between the enclosure and S1155PC
must have a cable area of at least 0.5 mm².
L
PEN
1
L
2
L
3
Electrical distribution unit
NIBE product
Incoming electricity
21
Chapter 5 | Electrical connections
NIBE S1155PC