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When the cable is connected to the terminal block a
z z
z z
screwdriver is used to open the terminal block, see fig-
ure below.
2
3
1
4
Figure 10: Connecting cable to terminal block.
6.3
Connecting the power supply
BB B B
Electrical current! The power cable may only
be connected to the terminal block intended for
this purpose. No other terminal blocks may be
used!
6.4
Positioning and connecting outdoor
sensors
D B
BB
NOTE! The outdoor sensor is connected with
extra low protection voltage. Follow the specific
installation instructions for the outdoor sensor!
Recommended location
Unsuitable location
Figure 11: Positioning the outdoor sensor.
Position the outdoor sensor on the north or north west
z z
z z
side of the house.
z z
5
OK!
z z
z z
The outdoor sensor is connected by a two core cable. For
a cross section of 0.75 mm
m applies. For greater lengths a cross section of 1.5 mm
used, up to a maximum of 120 m.
Then connect the sensor to the heat pump's control cen-
tre according to the electrical instructions.
7
7.1
The room temperature sensor has a temperature sensor
that provides a further value that the control system can
use when calculating the supply temperature. The influ-
ence of the room sensor in the calculation can be set in
the menu HEAT CURVE-> ROOM FACTOR. Default setting
for ROOM FACTOR is 2 but can be adjusted from 0 (no
impact) to 4 (large impact).
The difference between the desired and actual indoor
temperature is multiplied by the set value for ROOM
FACTOR. The set point on the heating system's supply
line increases or decreases with the result depending on
whether there is a deficit or surplus of heat.
The table below shows examples of how the set point for
the supply line is affected at CURVE 40 with different set-
tings for ROOM FACTOR.
In the event of a heating deficit:
ROOM
FACTOR
VMBMH302
To measure the outdoor temperature as accurately
z z
as possible, the sensor must be positioned 2/3 of the
way up the facade on houses up to three storeys high.
For higher buildings, the sensor should be positioned
between the second and third storeys. Its location must
not be completely protected from the wind but not in
a direct draft. The outdoor sensor should not be placed
on reflective panel walls.
The sensor must be positioned at least 1 m from open-
z z
ings in the walls that emit hot air.
If the sensor cable is connected through a pipe, the
z z
pipe must be sealed so that the sensor is not affected
by outgoing air.
Installing accessories/
additional functions
Room temperature sensor
Increased
room tempe-
rature, °C
0
22
1
22
2
22
3
22
4
22
a maximum cable length of 50
2
Actual room
Set point for
temperature,
supply line,
°C
°C
20
40
20
42
20
44
20
46
20
48
Installation – 15
is
2
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