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Main Functions SiUS091628EA
13 Functions and Control
1. Main Functions
1.1 Temperature Control
Definitions of
Temperatures The definitions of temperatures are classified as following.
Š
Room temperature: temperature of lower part of the room
Š
Set temperature: temperature set by remote controller
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Room thermistor temperature: temperature detected by room temperature thermistor
Š
Target temperature: temperature determined by microcomputer
Temperature
Control The temperature of the room is detected by the room temperature thermistor. However, there is a
difference between the temperature detected by room temperature thermistor and the temperature
of lower part of the room, depending on the installation condition. Practically, the temperature
control is done by the target temperature appropriately adjusted for the indoor unit and the
temperature detected by room temperature thermistor.
1.2 Frequency Principle
Control
Parameters The frequency of the compressor is controlled by the following 2 parameters:
„
The load condition of the operating indoor unit
„
The difference between the room thermistor temperature and the target temperature
The target frequency is adapted by additional parameters in the following cases:
„
Frequency restrictions
„
Initial settings
„
Forced cooling operation
Inverter Principle To regulate the capacity, a frequency control is needed. The inverter makes it possible to control
the rotation speed of the compressor. The following table explains the inverter principle:
Target temperature
Set temperature
Room temperature
Room thermistor temperature
(R24366)
Phase Description
1 The supplied AC power source is converted into the DC power source for the present.
2 The DC power source is reconverted into the three phase AC power source with variable
frequency.
„
When the frequency increases, the rotation speed of the compressor increases resulting
in an increase of refrigerant circulation. This leads to a larger amount of heat exchange
per unit.
„
When the frequency decreases, the rotation speed of the compressor decreases
resulting in a decrease of refrigerant circulation. This leads to a smaller amount of heat
exchange per unit.