IVT Optima 1000 Assembly, Commissioning And Maintenance Manual page 16

Basic functions (Customer level 1)
Outdoor temperature:
The outdoor temperature determines how much heating the heat pump
should produce. A sensor placed outdoors sends signals to the control unit,
which then adjusts the heat pump.
Cur ve slope:
You can change the curve slope to increase or decrease the heating in the
house. The scale is between 0-10.
High return - dashed line:
When the return temperature rises above 48ºC an alarm is given. The alarm
switches off the heat pump. The heat pump starts automatically when the
return temperature drops.
Return temperature (ºC)
In cold weather (below -5ºC):
If you are not satisfi ed with the indoor temperature when it is colder than -5ºC
outdoors, you need to change the slope of the heat curve. This is what to do:
1. Press the Heat button in the initial menu.
Temp. incr. / decr.
0 4,0
Return Adjust
2. Press the Adjust button.
3. Turn the menu dial clockwise to increase the heating, i.e. choose a higher
curve.
(Adjust in small increments, 0.5-1.0 units is usually enough).
Temp. incr. / decr.
0 5,0
Return Adjust
4. Save the new value by pressing the Save button.
Curve slope (0-10)
Outdoor temperature (ºC)
10
10
On delivery the heat pump curve slope
is set to position 4. This means that the
return temperature is +35ºC when it is
0ºC outdoors.
Cur ve slope:
1-2
3-4
4-6,5
7-10
From the heat curve we see that curve
slope 4 gives a return temperature of
+35ºC when it is 0ºC outdoors. If the
outdoor temperature drops we can see
that the return temperature increases.
The colder the outdoor temperature
the higher the return temperature. At
an outdoor temperature of approxi-
mately -22ºC we see the curve slope
has reached the limit value (+48
for the return temperature.
You should wait at least twenty-four
hours when increasing or decreas-
ing the heating before making a new
adjustment.
At outdoor temperatures around 0ºC
you should "adapt the heat curve" to
obtain the desired indoor temperature.
Read how to "adapt the curve" in the
section Extra functions - Customer level
2 / Temperature settings / Adapting the
heat curve.
16
Note
Normal setting for fl oor heating
in concrete.
Normal setting for fl oor heating
in wooden joists.
Normal setting for radiators.
Abnormal high setting.
Note
O
C)
Note