SiBE121135_A Function of RA Indoor Unit
Function and Control 74
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 rotation speed of the compressor is increased when starting the heating (or cooling).
This enables to reach the set temperature quickly.
Even during extreme cold weather, 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 Operation Refer to page 243 for detail.
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
power
DC
power
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
50 Hz
60 Hz
Frequency Functions
Low Four way valve operation compensation. Refer to page 116.
High Compressor protection function. Refer to page 117.
Discharge pipe temperature control. Refer to page 117.
Input current control. Refer to page 118.
Freeze-up protection control. Refer to page 118.
Heating peak-cut control. Refer to page 119.
Defrost control. Refer to page 121.
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