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 225. 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 when the air/water heat pump
is permitted to produce cooling)
• 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 information message in the display.
Potential-free signal of type NO or NC.
• pressure switch for climate system (NC).
External activation of functions
An external switch function can be connected to
VVM 225 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”
To change the supply temperature and in doing so
change the room temperature, an external switch
function can be connected to VVM 225.
When the switch is closed, the temperature changes
in °C (if the room sensor is connected and activated).
If a room sensor is not connected or not activated,
the desired change of “temperature” (heating curve
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 ac-
cessories.
– climate system 1 to 8
The value for the change is set in menu 1.9.2, "ex-
ternal adjustment".
• SG ready
Caution
This function can only be used in mains net-
works that support the "SG Ready" standard.
"SG Ready" requires two AUX inputs.
"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 heat and/or compressor in
the heat pump at certain times of the day (can be se-
lected in menu 4.1.5 after the function is activated).
Activate the function by connecting potential-free
switch functions to two inputs selected in menu 5.4
(SG Ready A and SG Ready B).
Closed or open switch means one of the following:
– Blocking (A: Closed, B: Open)
"SG Ready" is active. The compressor in the heat
pump and additional heat is blocked like the day's
tariff blocking.
– Normal mode (A: Open, B: Open)
"SG Ready" is not active. No effect on the system.
NIBE VVM 225Chapter 5 | Electrical connections30
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