Nibe S1255 - Connections

Connections
TERMINAL BLOCKS
The following terminal blocks are used on the base board
(AA2).
-X29
-X28
1 0-5V 2 +5V
3 AUX1 4 AUX2 5 AUX3 6 AUX4 7 AUX5 8 AUX6 9 AUX7
10 AUX8 11 AUX9 12 BT25
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
13 BT50 14 BT1
-X30
AA2
X1
X5X6-2X6-1
X7-2
X9
POWER CONNECTION
Supply voltage
Enclosed cable for incoming supply electricity is connected
to terminal block X1 and X6-1 on the PCB (AA2).
Connection 3x230V
AA2-X1
PE (L2) L1 L2 L3
1 2 3 4
AA2-X6-1
Connection 1x230V
AA2-X1
PE N L (L) (L)
1 2 3 4
AA2-X6-1
Connection 3x400V
AA2-X1
AA2-X6-1
PE N L1 L2 L3
1 2 3 4
If separate supply to the compressor and immersion heater
is required, see section "External blocking of functions" ".
Tariff control
If the voltage to the immersion heater and/or compressor
is lost for a period, this must be blocked at the same time
via the selectable inputs, see section "Selectable inputs/out-
puts – Possible selections for AUX inputs".
External control voltage for the control
system
NOTE
Mark up any junction boxes with warnings for ex-
ternal voltage.
Control voltage (230 V ~ 50Hz) connects to AA2:X5:N, X5:L
and X6-2 (PE).
When connecting external control voltage, remove the
bridges from terminal block X5.
L
N
1. 2.
3. 4.
X5
NIBE S1255Chapter 5 | Electrical connections20