Connections
TERMINAL BLOCKS
The following terminal blocks are used on the base board
(AA2).
-X29
-X28
0-5V 1
+5V 2
AUX1 3
AUX2 4
AUX3 5
AUX4 6
AUX5 7
AUX6 8
AUX7 9
AUX8 10
BT6 11
BT25 12
1
1
2
3
2
3
4
5
6
7
8
9
10
11
12
GND
+12V
B
A
OT+
OT−
0-5V
PWM0
PWM1
CPU
EXT COM
INT COM
ERROR
POWER
+5V
GND
BE1
BE2
BE3
K10
-X27
NO
O
NC
AUX-RELAY
BT50 13
BT1 14
-X30
POWER CONNECTION
Supply voltage
Enclosed cable for incoming supply electricity is connected
to terminal block X1 and X6-1 on the PCB (AA2).
Connection 1x230 V
AA2-X1
PE N L (L) (L)
1 2 3 4
AA2-X6-1
External control voltage for the control
system
If the control system is to be powered separately from the
other components in the heat pump (e.g. for tariff control),
a separate operating cable must be connected.
NOTE
During service, all supply circuits must be discon-
nected.
Remove the bridges from terminal block X5.
Control voltage (230 V ~ 50Hz) connects to AA2:X5:N, X5:L
and X6-2 (PE).
Enclosed label
The enclosed label is placed on the electrical connection’s
cover.
Tariff control
If the voltage to the immersion heater and/or compressor
is lost for a period, "Tariff blocking" must be selected at the
same time via the selectable inputs, see section "Selectable
inputs".
23Chapter 5 | Electrical connectionsNIBE S1156
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