IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual page 16

Basic functions - Customer level 1
Change the cur ve slope
Raising or lowering the curve slope in the menu Temperature increase/
decrease infl uences the heat pump's production of heat. This is especially
effective in cold weather conditions.
Return temperature (ºC)
Dashed line:
If the return temperature exceeds 57ºC an alarm is given and the compres-
sor switches off. The heat pump starts automatically when the return
temperature drops.
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.
Turn the menu dial anti-clockwise to lower the heating.
(Adjust in small increments, 0.2-0.6 units is usually enough.)
Temp. incr. / decr.
0 5,0
Return Adjust
4. Save the new value by pressing the Save button.
Outdoor temperature (ºC)
10
10
Curve slope (0-10)
Cur ve slope:
2-4
4-6,5 Normal setting for radiators.
7-10
From the heat curve we see that
curve slope 4 gives a return tempera-
ture 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 tempera-
ture of approximately -30ºC we see
the curve slope has nearly reached
the limit value (+57ºC) for the return
temperature.
You should wait at least one day when
increasing or decreasing the heating
before making a new adjustment.
If it is still diffi cult to get a comfort-
able indoor temperature at an outdoor
temperature around 0ºC, despite
several attempts, you should "adjust
the heat curve". Read how to "adjust
the curve"in the section Extra func-
tions - Customer level 2 / Temperature
settings / Adapting the heat curve.
16
Normal setting for fl oor heat-
ing.
Abnormal high setting.
Note