SELECTABLE IN/OUTPUTS
VVM S320 has software-controlled AUX inputs and outputs
for connecting the external switch function (contact has to
be potential-free) or sensor.
In menu 7.4 - "Selectable in/outputs", you select the AUX
connection to which each function has been connected.
For certain functions, accessories may be required.
TIP
Some of the following functions can also be activ-
ated and scheduled via menu settings.
Selectable inputs
Selectable inputs on the base board (AA2) for these func-
tions are AA2-X28:3-11. Each function connects to any input
and GND (AA2-X29).
6 7
8
54
3
AUX4
AUX5
AUX6
AUX3
AUX2
AUX1
AA2-X28
AA2-X29
GND
The example above uses the inputs AUX1 (AA2-X28:3) and AUX2 (AA2-X28:4).
Selectable outputs
A selectable output is AA2-X27.
If VVM S320 is switched off or in emergency mode, the relay
is in C-NC position.
Caution
The relay output may be subjected to a max load
of 2 A at resistive load (230V AC).
TIP
The AXC accessory is required if more than one
function is to be connected to the AUX output.
Possible selection for AUX inputs
Temperature sensor
Available options are:
• cooling/heating/hot water, determines when it is time to
switch between cooling, heating and hot water mode
(selectable when the air/water heat pump is permitted to
produce cooling).
Monitor
Available options are:
• alarm from external units. The alarm is connected to the
control, which means that the malfunction is presented
as an information message 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 (NC) are switched
off.
External activation of functions
An external switch function can be connected to VVM S320
to activate various functions. The function is activated
during the time the switch is closed.
Possible functions that can be activated:
• hot water demand mode "More hot water"
• hot water demand mode "Small"
• “External adjustment”
When the switch is closed, the temperature is changed in
°C (if a room sensor is connected and activated). If a room
sensor is not connected or not activated, the desired
change of "Temperature" ("Offset") is set with the number
of steps selected. The value is adjustable between -10
and +10. External adjustment of climate systems 2 to 8
requires accessories.
– climate system 1 to 8
Setting the value for the change is performed in menu
1.30.3 - "External adjustment".
• activation of one of four fan speeds.
(Can be selected if ventilation accessory is activated.)
The following options are available:
– "Activate fan speed 1 (NO)" - "Activate fan speed 4 (NO)"
– “Activate fan speed 1 (NC)”
The fan speed is activated during the time the switch is
closed. Normal speed is resumed when the switch is
opened again.
• SG ready
Caution
This function can only be used in mains networks
that support the "SG Ready" standard.
"SG Ready" requires two AUX inputs.
In cases where this function is required, it must be con-
nected to terminal block X28 on the base board (AA2).
"SG Ready" is a smart form of tariff control, through which
your electricity supplier can affect the indoor, hot water
and/or pool temperatures (if applicable) or simply block
the additional heating and/or the compressor in the heat
pump at certain times of the day (can be selected in menu
25Chapter 5 | Electrical connectionsNIBE VVM S320
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