SiBE12-933_A
Main Functions
Function and Control
57
Drawing of
Inverter
The following drawing shows a schematic view of the inverter principle:
Inverter Features
The inverter provides the following features:
The regulating capacity can be changed according to the changes in the outdoor
temperature and cooling / heating load.
Quick heating and quick cooling
The compressor rotational speed is increased when starting the heating (or cooling). This
enables to reach the set temperature quickly.
Even during extreme cold weather, the high capacity is achieved. It is maintained even when
the outdoor temperature is 2°C.
Comfortable air conditioning
A fine adjustment is integrated to keep the room temperature constant.
Energy saving heating and cooling
Once the set temperature is reached, the energy saving operation enables to maintain the
room temperature at low power.
Frequency Limits
The following table shows the functions that define the minimum and maximum frequency:
Forced Cooling
Operation
For more information, refer to “Forced cooling operation mode” on page
251
.
50 Hz
60 Hz
Refrigerant circulation rate (high)
high f
low f
freq=variable
Refrigerant circulation rate (low)
high speed
low speed
(R2812)
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
freq=
constant
capacity=
variable
AC
po
w
e
r
DC
po
w
er
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
Frequency limits
Limited during the activation of following functions
Low
Four way valve operation compensation. Refer to page 83.
High
Discharge pipe temperature control. Refer to page 85.
Input current control. Refer to page 85.
Compressor protection function. Refer to page 84.
Heating peak-cut control. Refer to page 86.
Freeze-up protection control. Refer to page 86.
Defrost control. Refer to page 88.