Nibe S1155 Installer Manual page 24

Activate the energy meter(s) in menu 7.2 and then set
the desired value (energy per pulse) 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.
COMMUNICATION
Multi-installation
Several heat pumps can be interconnected by selecting
one heat pump as the main unit and the others as sub-
ordinate heat pumps. Ground source heat pump models
with multi-installation functionality from NIBE can be
connected to S1155.
A further eight heat pumps can be connected to the
main unit. In systems with several heat pumps, each
pump must have a unique name. Only one heat pump
can be "Main unit" and only one can be e.g. "Heat pump
5". Main unit/heat pump are set in menu 7.3.1.
External temperature sensors and control signals must
only be connected to the main unit, except for external
control of the compressor module.
NOTE
When several heat pumps are connected to-
gether, an external supply temperature sensor
(BT25) and an external return line sensor (BT71)
must be used.
Connect the communication cables between the heat
pumps as illustrated in series to terminal block X30:1
(GND), X30:2 (+12V), X30:3 (B) and X30:4 (A) on the
PCB (AA2).
Use cable type LiYY, EKKX or similar.
The example shows the connection of several S1155 .
Main unit Heat pump 2
Huvudenhet Värmepump 2
1 2 3 4 1
AA2-X30 AA2-X30
24 Chapter 5 | Electrical connections
Heat pump 3
Värmepump 3
2 3 4 1 2 3 4
AA2-X30
Connecting accessories
Instructions for connecting accessories are provided in
the manual accompanying the accessory. See section
"Accessories" for a list of the accessories that can be
used with S1155. Connection for communication with
the most common accessories is shown here.
Accessories with accessory board (AA5)
Accessories with accessory board (AA5) connect to
terminal block AA2-X30:1,3,4 in S1155. Use cable type
LiYY, EKKX or equivalent.
If several accessories are to be connected, connect the
first accessory board directly to the terminal block in
S1155. Other accessory boards are connected to the
first in series.
Because there can be different connections for accessor-
ies with accessory board (AA5), you should always read
the instructions in the manual for the accessory that is
to be installed.
S1155
AA2-X30
4 A
3 B
+12V
2
GND
1
Accessory 1
AA5-X4
1 A
2 B
GND
3
A
4
B
5
GND
6
7
8
Accessory 2
AA5-X4
A
1
2 B
3 GND
4 A
5 B
6 GND
7
8
SELECTABLE OUTPUTS/INPUTS
On the PCB (AA2), S1155 has software-controlled AUX
inputs and outputs for connecting the external switch
function (contact has to be potential free) or sensor.
Go into menu 7.4 "Selectable in/outputs" on the display
to select to which AUX connection each function con-
nects.
Selectable inputs for these functions are AA2-X28:3-11.
Each function connects to any input and GND (AA2-X29).
NIBE S1155