Main Functions; Temperature Control; Frequency Principle - Daikin SiENBE07-618_C Service Manual

Main Functions

1. Main Functions

1.1

Temperature Control

Definitions of The definitions of temperatures are classified as following.
Temperatures
Š Room temperature: temperature of lower part of the room
Š Set temperature: temperature set by remote control
Š Room thermistor temperature: temperature detected by room temperature thermistor
Š Target temperature: temperature determined by microcomputer
Temperature
The temperature of the room is detected by the room temperature thermistor. However, there is
Control difference between the "temperature detected by room temperature thermistor" and the
"temperature of lower part of the room", depending on the type of the indoor unit or 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

Main Control
The compressor is frequency-controlled during normal operation. The target frequency is set by
the following 2 parameters coming from the operating indoor unit:
Parameters
„ The load condition of the operating indoor unit
„ The difference between the room thermistor temperature and the target temperature
Additional
The target frequency is adapted by additional parameters in the following cases:
„ Frequency restrictions
Control
„ Initial settings
Parameters
„ Forced cooling operation
Inverter Principle To regulate the capacity, a frequency control is needed. The inverter makes it possible to vary
the rotation speed of the compressor. The following table explains the conversion principle:
Phase
18
Room temperature
H The illustration is for wall mounted type as representative.
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 increased refrigerant circulation. This leads to a higher amount of the heat
exchange per unit.
„ When the frequency decreases, the rotation speed of the compressor decreases
resulting in a decreased refrigerant circulation. This leads to a lower amount of the heat
exchange per unit.
Room thermistor temperature
Description
SiENBE07-618_C
Target temperature
Set temperature
(R12321)
Function and Control