Nibe S1255-12 - Page 19

ACCESSIBILITY, ELECTRICAL CONNECTION
Removing the cover
The cover is opened using a screwdriver.
Removing the covers
The cover is opened using a screwdriver.
CABLE LOCK
Use a suitable tool to release/lock cables in the heat
pump terminal blocks.
Terminal block
1.
2.
TEMPERATURE LIMITER
-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
FQ10-S2
The temperature limiter (FQ10) cuts the power supply
to the electrical additional heat if the temperature rises
above 89 °C and it is reset manually.
Resetting
The temperature limiter (FQ10) can be accessed behind
the front cover. Reset the temperature limiter by
pressing its button (FQ10-S2).
19Chapter 5 | Electrical connectionsNIBE S1255