Main Functions SiUS04-702
20 Function and Control
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 36°F.
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
Operation
For more information, refer to “Forced operation mode” on page
46
.
60 120 300
113˚F
Air discharge
temperature
inverter
normal heat pump
Start seconds
(R4144)
Frequency limits Limited during the activation of following functions
Low Four way valve operation compensation. Refer to page 37.
High Input current control. Refer to page 39.
Compressor protection function. Refer to page 38.
Heating peak-cut control. Refer to page 40.
Freeze-up protection control. Refer to page 39.
Defrost control. Refer to page 41.
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