EXTERNAL CONTROL VOLTAGE FOR THE
CONTROL SYSTEM
If the control system will be powered separately from other
components in the indoor module (e.g. for tariff control), a
separate operating cable must be connected.
NOTE
Mark up any junction boxes with warnings for ex-
ternal voltage.
NOTE
During service, all supply circuits must be discon-
nected.
If you wish to connect an external operating voltage for the
control system to VVM 500 on the immersion heater board
(AA1), the edge connector at AA1:X2 must be moved to
AA1:X9 (as illustrated).
Control voltage (1x230V ~ 50Hz) is connected to AA1:X11 (as
illustrated).
1
2
3
4
5
6
ON
L1
1
L2
L3
PE
PE
0
N
N
L
N+PE
N+PE operating voltage
AA1
AA1-X8
AA1-X2
AA1-X9
AA1-X11
Tariff control
If the voltage to the immersion heater is lost for some time,
"Tariff blocking" must be selected at the same time via the
selectable inputs, see section "Selectable inputs".
CONNECTING SENSOR
AA3-X6
Outside sensor
The outdoor temperature
sensor (BT1) is placed in the
shade on a wall facing north or
north-west, so it is unaffected,
for example, by the morning
sun.
Connect the outdoor temperat-
ure sensor to terminal block
X6:1 and X6:2 on the input board (AA3).
If a conduit is used it must be sealed to prevent condensa-
tion in the sensor capsule.
1
2
3
4
AA3-X6
BT1
External
VVM 500
NIBE VVM 500
Chapter 5 | Electrical connections
22