Optional connections
LOAD MONITOR
Integrated load monitor
VVM 320 is equipped with a simple form of integrated
load monitor, which limits the power steps for the
electric additional heat by calculating whether future
power steps can be connected to the relevant phase
without the specified main fuse being exceeded. In
those cases where the current would exceed the spe-
cified main fuse, the power step is not permitted. The
size of the property’s main fuse is specified in menu
5.1.12.
If the installed heat pump is frequency controlled, it will
be limited when all power stages are disengaged.
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 320 has software-controlled AUX inputs and out-
puts on the input board (AA3), for connecting the extern-
al switch function or sensor. This means that when an
external switch function (the switch must be potential-
free) or sensor is connected to one of six special con-
nections, this function must be selected for the correct
connection in menu 5.4.
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.
Selectable inputs
Selectable inputs on the input board for these functions
are:
AA3-X6:9-10AUX1
AA3-X6:11-12AUX2
AA3-X6:13-14AUX3
AA3-X6:15-16AUX4
AA3-X6:17-18AUX5
SMO Externt
9
10
11
12
13
14
15
16
B
A
The example above uses the inputs AUX1 (X6:9-10) and AUX2 (X6:11-
12) on the input board (AA3).
Selectable output
A selectable output is AA3-X7.
TIP
Some of the following functions can also be
activated and scheduled via menu settings.
Possible selection for AUX inputs
Temperature sensor
Temperature sensor can be connected to VVM 320. Use
a 2-core cable of at least 0.5 mm² cable area.
Available options are:
• cooling/heating/hot water, determines when it is time
to switch between cooling, heating and hot water
mode (can be selected if cooling accessory is installed)
• supply temperature sensor for cooling (BT64) (used
when “active cooling in 4-pipe system” has been ac-
tivated in the output AA3-X7)
Monitor
Available options are:
• alarm from external units. The alarm is connected to
the control, which means that the malfunction is
presented as an info-alarm in the display. Potential-
free signal of type NO or NC.
• stove monitor. (A thermostat that is connected to the
chimney. When the negative pressure is too low and
the thermostat is connected, the fans in ERS are
closed. (NC))
External activation of functions
An external switch function can be connected to
VVM 320 to activate various functions. The function is
activated during the time the switch is closed.
Possible functions that can be activated:
• hot water comfort mode “temporary lux”
• hot water comfort mode “economy”
• “external adjustment”
An external contact function can be connected to
VVM 320 to change the supply temperature and the
room temperature.
NIBE VVM 320Chapter 5 | Electrical connections34
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