Connecting external operating voltage for
the control system
NOTE
Only applies to power connection of 3x400V.
NOTE
Mark up any junction boxes with warnings for
external voltage.
If you wish to connect external operating voltage for the
control system to F470 on the immersion heater circuit
board (AA1) the edge connector at AA1:X2 must be
moved toAA1:X9 (as illustrated).
When connecting external operating voltage for the
control system with separate earth-fault breaker, discon-
nect the blue cable from terminal block X7:24 on the
immersion heater circuit board (AA1) and connect in the
enclosed top clamp together with the incoming operat-
ing zero. Connect a blue cable (min 0.75 mm
2
) between
the top clamp and X11:N on the immersion heater circuit
board (as illustrated).
Operating voltage (230VAC) is connected to AA1:X11
(as illustrated).
ON
L1 1 L2 L3PE
PE
0N
NL
1x230V+N+PE
230V ~ 50Hz operating voltage
AA1
AA1-X8
AA1-X2
AA1-X9
AA1-X7
AA1-X11
To AA8
*
* Only with separate earth-fault breaker.
Switching from 3x400 V to 1x230 V
F470 can be switched from 3x400 V to 1x230 V by con-
necting the supply to L1 and L3.
Outside sensor
Install the outdoor temperature sensor (BT1) in the shade
on a wall facing north or north-west, so it is unaffected
by the morning sun for example.
Connect the sensor to terminal block X6:1 and X6:2 on
the input board (AA3). Use a twin core cable of at least
0.5 mm² cable area.
If a conduit is used it must be sealed to prevent condens-
ation in the sensor capsule.
NIBE F470Chapter 5 | Electrical connections24
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