Sensors
Outside sensor
The outdoor temperature sensor (BT1) is placed in the shade
on a wall facing north or north-west, so it is unaffected, for
example, by the morning sun.
Connect the outdoor temperature sensor to terminal block
AA2-X28:14 and AA2-X29:GND.
If a conduit is used it must be sealed to prevent condensa-
tion in the sensor capsule.
13
1211
109 14
BT1
BT1
BT50
GND
BT25
AUX9
AUX8
AUX7
AA2-X28
AA2-X29
External supply temperature sensor
If an external supply temperature sensor (BT25) needs to
be used, connect it to terminal block AA2-X28:12 and to
terminal block AA2-X29:GND.
1211109
BT25
GND
BT25
AUX9
AUX8
AUX7
AA2-X28
AA2-X29
Room sensor
VVM S320 is supplied with an enclosed room sensor (BT50)
that makes it possible to display and control the room tem-
perature in the display on VVM S320.
Fit the room sensor in a neutral position where a set temper-
ature is required. A suitable location might be, for example,
on a free inner wall in a hall approx. 1.5 m above the floor. It
is important that the room sensor is not obstructed from
measuring the correct room temperature, for example by
being located in a recess, between shelves, behind a curtain,
above or close to a heat source, in a draught from an external
door or in direct sunlight. Closed radiator thermostats can
also cause problems.
VVM S320 operates without room sensor, but if you want
to read the home’s indoor temperature from the display on
VVM S320, the room sensor must be fitted. Connect the
room sensor to terminal block X28:13 and AA2-X29:GND.
If a room sensor is to be used to change the room temperat-
ure in °C and/or to fine-tune the room temperature, the
sensor must be activated in menu 1.3 - "Room sensor set-
tings".
If a room sensor is used in a room with underfloor heating,
it should only have an indicatory function, not control of the
room temperature.
13121110
BT50
GND
BT50
BT25
AUX9
AUX8
AA2-X28
AA2-X29
Caution
Changes of temperature in accommodation take
time. For example, short time periods in combina-
tion with underfloor heating will not give a notice-
able difference in room temperature.
Pulse energy meter
Up to two electricity meters or energy meters for heating
(BE6, BE7) can be connected to VVM S320 via terminal
blocks AA2-X28:1-2 and AA2-X30:7-8.
Caution
The EMK accessory is connected to the same ter-
minal blocks as electricity meters/energy meters.
BE7
+OT
+OT
0-5V
+5V
GND
95 6 7 8
AA2-X28
+5V
+5V
0-5V
+5V
AUX 1
AUX 2
AUX 3
AA2-X30
51 2 3 4
BE6
Activate the meter(s) in menu 7.2 - "Accessory settings"
and then set the desired value ("Energy per pulse" or "Pulses
per kWh") in menu 7.2.19 -"Pulse energy meter".
Load monitor
Integrated load monitor
VVM S320 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
NIBE VVM S320Chapter 5 | Electrical connections22
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