NOTE
All electrical connections must be carried out by
an authorised electrician.
Electrical installation and wiring must be carried
out in accordance with national provisions.
ERS 20 must not be powered during installation.
NOTE
If the supply cable is damaged, only NIBE, its ser-
vice representative or similar authorised person
may replace it to prevent any danger and damage.
• To prevent interference, sensor cables to external connec-
tions must not be laid close to high voltage cables.
• The minimum area of communication and sensor cables
to external connections must be 0.5 mm² up to 50 m, for
example EKKX, LiYY or equivalent.
For electrical wiring diagram, see page 41.
Overview accessory board (AA5)
ON
1 2 3 4 5 6 7 8
-X9
-X2
24 20212223 1516171819 1011121314 56789 1
1
N
L
PE
PE
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
234
-X8
-X4
-X10
-X1
Supply
ERS 20 is connected to a earthed single-phase wall socket
or a permanent installation. For permanent installations,
ERS 20 must be preceded by a circuit breaker with at least
a 3 mm breaking gap.
Connecting to main product
CONNECTING TO THE HEAT PUMP
ERS 20 contains an accessory board (AA5) that connects
directly to the main product’s input board (terminal block
AA3-X4).
The communication cable (W102) is connected to the access-
ory board (AA5) from the factory.
If several accessories are to be connected, or are already
installed, the boards are connected in series.
Because there can be different connections for accessories
with accessory board (AA5), you should always read the in-
structions in the manual for the accessory that is to be in-
stalled.
AA3-X4
15
14
13
A
B
GND
AA5-X4
1
2
3
4
5
6
7
8
A
B
GND
A
B
GND
AA5-X4
1
2
3
4
5
6
7
8
A
B
GND
A
B
GND
Main product
Accessory card 1
Accessory card 2
ON
1 2 3 4 5 6 7 8
-X9
-X2
24 20212223 1516171819 1011121314 56789 1
1
N
L
PE
PE
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
234
-X8
-X4
-X10
-X1
ON
1 2 3 4 5 6 7 8
-X9
-X2
24 20212223 1516171819 1011121314 56789 1
1
N
L
PE
PE
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
234
-X8
-X4
-X10
-X1
AA5-X4
AA5-X4
AA3-X4
F1245/F1255
VVM
225/310/320/325/500
AA3-X4
F1145/F1155
NIBE ERS 20-300Chapter 15 | Electrical connection32
F
Electrical connection
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