Optional connections
LOAD MONITOR
Integrated load monitor
VVM 310 is equipped with a simple form of integrated load
monitor, which limits the power steps for the electric addi-
tional heat by calculating whether future power steps can
be connected to the relevant phase without exceeding the
current for the specified main fuse. In those cases where
the current would exceed the specified main fuse, the power
step is not permitted. The size of the property’s main fuse
is specified in menu 5.1.12 - "Load monitor".
Load monitor with current sensor
When many power-consuming products are connected in
the property at the same time as the electric additional heat
is operating, there is a risk that the property’s main fuse will
trip. VVM 310 is equipped with a load monitor that, with the
help of a current sensor, controls the power steps for the
electric additional heat by redistributing the power between
the different phases or disengages the electric additional
heat if there is an overload in a phase. Reconnection occurs
when the other current consumption drops.
Caution
Activate phase detection in menu 5.1.12 for full
functionality, if current sensors are installed.
Connecting current sensors
NOTE
If the installed air/water heat pump is frequency
controlled, it will be limited when all power stages
are disconnected.
A current sensor should be installed on each incoming phase
conductor in to the distribution box to measure the current.
The distribution box is an appropriate installation point.
Connect the current sensors to a multi-core cable in an en-
closure directly adjacent to the electrical distribution unit.
The multi-core cable between the enclosure and VVM 310
must have a cable area of at least 0.5 mm².
Connect the cable to the input board (AA3) on terminal block
X4:1-4 where X4:1 is the common terminal block for the three
current sensors.
L
PEN
1
L
2
L
3
AA3-X4
AA3-X4
Electrical
distribution unit
VVM 310
Incoming electricity
-T1 -T2 -T3
1 2 3 4
NIBE UPLINK
Connect the network connected cable (straight, Cat.5e UTP)
with RJ45-contact (male) to RJ45 contact (female) on the
rear of the indoor unit.
EXTERNAL CONNECTION OPTIONS (AUX)
VVM 310 has software-controlled AUX inputs and outputs
for connecting the external switch function (contact has to
be potential-free) or sensor.
In menu 5.4 - "soft in/outputs", you select the AUX connec-
tion to which each function has been connected.
block heating
activate temp lux
not used
not used
not used
alarm output
soft in/outputs 5.4
For certain functions, accessories may be required.
NIBE VVM 310
Chapter 5 | Electrical connections
24
