Heating
Heating
Heat produced with selected outdoor unit.
Heating can also be created with one of the following:
■
Internal electric additional heat before. QN10
■
External additional heat
Continuous circulation of heat in the heating system
occurs:
■
GP1 circulates the heating system during heating
operation and waiting mode.
■
GP6 circulates the heating system during hot water
charging.
Desired supply temperature calculated as function of
filtered outdoor temperature with heat curve and any
offset.
Degree minutes
The heating requirement is calculated every minute
using the following formula (DM = Degree minutes):
New DM = Previous DM + (actual value - set point value)
Actual value is the temperature on BT25. If not avail-
able, BT2 is used.
Set point value is the calculated flow temperature.
Degree minutes (DM):
■
DM is calculated every minute.
■
DM is calculated in steps of 0.1 and displayed in
whole units.
■
Manual change of DM occurs in units of ten, menu
4.9.3.
■
At start-up DM is always 0.
■
When heating is not permitted DM is locked on 0.
■
Highest DM value is +100.
■
Lowest DM value is the value of the last additional
heat step connection plus the difference between
additional heat steps.
Factory settingNameMenu
-60Start comp4.9.3
700Start addition
100Diff between addition-
al heat step
Forced control of degree minutes
Forced control is used to stop the compressor and
auxiliary heater when the actual value is too high in
relation to the set point value.
NOTE
Forced control is not active during and 5
minutes after a start or a shift from one de-
mand to another.
RemarksFactory set-
ting
NameMenu
Sets DM to:
+1
10 °CMax diff.
compressor
5.1.3
Sets DM to:
Start addi-
tional heat
+ diff
between ad-
ditional
heat step +
1
7 °CMax diff. ad-
ditional
heat
Heating curve
Curve coefficient and offset are used for setting of
correct set point value.
15 heat curves can be used.
Factory settingNameMenu
9Curve coefficient1.9.1
0Curve offset
Point offset
With point offset, the heating curve can be changed
at a specific outdoor temperature. The change starts
5 °C below and stops 5 °C above the set outdoor tem-
perature point.
Setting rangeNameMenu
-40 - 30 °COutdoor temperature
point
1.9.8
-10 - 10 °CChange in curve
Own curve
In own curve the desired flow temperature is selected
at fixed outdoor temperatures from -30 to +30 °C .
Factory settingNameMenu
45 °CFlow.temp -30 C1.9.7
40 °CFlow.temp -20 C
35 °CFlow.temp -10 C
32 °CFlow.temp 0 C
26 °CFlow.temp 10 C
15 °CFlow.temp 20 °C
15 °CFlow.temp 30 C
15Chapter 4 | Description of functionsNIBE™ VVM 320
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