Main Functions SiUS04-924
Function and Control 13
The compressor rotational speed is increased when starting the heating (or cooling) operation. This
enables a quick set temperature.
Even during extreme cold weather, a high capacity is achieved. It is maintained even when the
outdoor air temperature is 36°F(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 maintains 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 operation mode on page 41.
Frequency limits Limited during the activation of following functions
Low Four-way valve operation compensation. Refer to page 31.
High Discharge pipe temperature control. Refer to page 36.
Input current control. Refer to page 33.
Compressor protection function. Refer to page 32.
Heating peak-cut control. Refer to page 34.
Freeze-up protection control. Refer to page 34.
Defrost control. Refer to page 35.
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