Dual system - heating and cooling
Function
The heat pump prioritises hot water charging. The
compressor output is adjusted according to the outdoor
temperature. The charge pump varies the flow to main-
tain a high charge temperature.
When the water heater is full, the valves QM30 and
QM31 switch to the climate system. The heat pump is
then controlled by a calculated set point value on the
supply line. The compressor varies the output according
to the demand. The charge pump runs at a fixed set
speed.
Extra shunt (EP21-QN11) lowers the temperature on
system 2 according to settings in NIBE SPLIT ACVM270.
If the compressor does not manage the entire heat de-
mand, the addition is connected and the heat shunted
out on the flow line.
During cooling demand valve QN12 shifts to the cooling
system. The heat pump is then controlled by a calculated
set point value on the flow line. The compressor varies
the output according to the demand. The charge pump
runs at a fixed set speed.
Heating mode
ClosedQM30
OpenQM31
Active during balance point (A)QN11
Open (A)QN12
Hot water mode
OpenQM30
ClosedQM31
Open (AB)QN11
NIBE SPLIT ACVM270Chapter 3 | System description12
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