SiENBE07-618_C
Main Functions
Function and Control
19
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 functions regulate the minimum and maximum frequency:
Forced Cooling
Operation
Refer to “Forced operation mode” on page
42 for detail
.
50 Hz
60 Hz
(R2812)
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
Refrigerant circulation rate (low)
Refrigerant circulation rate (high)
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
freq=variable
high f
high speed
low speed
low f
capacity=
variable
AC
po
w
e
r
DC
po
w
e
r
freq=
constant
Frequency
Functions
Low
Four way valve operation compensation. Refer to page 32.
High
Compressor protection function. Refer to page 33.
Discharge pipe temperature control. Refer to page 33.
Input current control. Refer to page 34.
Freeze-up protection control. Refer to page 35.
Heating peak-cut control. Refer to page 35.
Defrost control. Refer to page 37.
SIENBE07-618_C_FRONT.pdf 31
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