Si12-411A Main Functions
Function and Control 73
Inverter Features The inverter provides the following features:
The regulating capacity can be changed according to the changes in the outdoor air
temperature and cooling / heating load.
Quick heating and quick cooling
The compressor rotational speed is increased when starting the heating (or cooling). This
enables a quick set temperature.
Even during extreme cold weather, the high capacity is achieved. It is maintained even when
the outdoor air temperature is 2°C.
Comfortable air conditioning
A detailed adjustment is integrated to ensure a fixed room temperature. It is possible to air
condition with a small room temperature variation.
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 /
Heating Operation
For more information, refer to “Forced operation mode” on page 104.
60 120 300
45˚C
Air discharge
temperature
inverter
normal heat pump
Start
seconds
(R1187)
Frequency limits Limited during the activation of following functions
Low Four way valve operation compensation. Refer to page 93.
High Input current control. Refer to page 94.
Compressor protection function. Refer to page 93.
Heating Peak-cut control. Refer to page 95.
Freeze-up protection. Refer to page 95.
Defrost control. Refer to page 97.
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