Connections
NOTE
To prevent interference, unscreened communica-
tion and/or sensor cables to external connections
must not be laid closer than 20 cm from high
voltage cables.
POWER CONNECTION
VVM 310 must be installed with a disconnection option on
the supply cable. Minimum cable area must be sized accord-
ing to the fuse rating used. The enclosed cable (length ap-
prox. 2 m) for incoming electricity is connected to terminal
block X1 on the immersion heater board (AA1). All installa-
tions must be carried out in accordance with current norms
and directives. The connection cable can be found on the
reverse of VVM 310.
Connection
3x400V
AA1-X1
PE1
L1
1
L2
L3
PE
0
N
B
B
A
A
VVM225
AA1-X1
TARIFF CONTROL
If the voltage to the immersion heater disappears during a
certain period, there must also be blocking via the AU-input,
see "Connection options- Possible selection for AU inputs".
EXTERNAL SUPPLY TEMPERATURE SENSOR
If an external supply temperature sensor (BT25) needs to
be used, connect it to terminal block X6:5 and X6:6 on the
input board (AA3). Use a 2-core cable with a cable area of
at least 0.5 mm².
F1245
4
5
6
7
AA3-X6
BT25
VVM 310
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 310 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".
NIBE VVM 310
Chapter 5 | Electrical connections
20
