Connections
NOTE
To prevent interference, unscreened commu-
nication and/or sensor cables to external con-
nections must not be laid closer than 20 cm
from high voltage cables.
POWER CONNECTION
VVM 320 must be installed with a disconnection option
on the supply cable. Minimum cable area must be sized
according to the fuse rating used. The enclosed cable
(length approx. 2 m) for incoming electricity is connected
to terminal block X1 on the immersion heater board
(AA1). All installations must be carried out in accordance
with current norms and directives. The connection cable
can be found on the reverse of VVM 320.
Connection
1x230V
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".
TEMPERATURE SENSOR, EXTERNAL FLOW
LINE
If temperature sensor, external flow line (BT25) needs
to be used, connect it to terminal block X6:5 and X6:6
on the input card (AA3). Use a 2 core cable of at least
0.5 mm² cable area.
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 VVM 320 on the immersion heater
circuit board (AA1) the edge connector at AA1:X2 must
be moved toAA1:X9 (as illustrated).
Operating voltage (1x230V ~ 50Hz) is connected to
AA1:X11 (as illustrated).
ON
L1 1 L2 L3PE
PE
0N
NL
1x230V+N+PE
1x230V+N+PE operating voltage
AA1
AA1-X8
AA1-X2
AA1-X9
AA1-X11
29Chapter 5 | Electrical connectionsNIBE VVM 320
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