Common Functions; Temperature Control; Frequency Principle - Daikin CTXG09QVJUW Service Manual

SiUS121630EA

1. Common Functions

1.1

Temperature Control

Definitions of The definitions of temperatures are classified as following.
Temperatures
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

Control The frequency of the compressor is controlled by the following 2 parameters:
Parameters
The target frequency is adapted by additional parameters in the following cases:
Functions and Control
Room temperature: temperature of lower part of the room
Set temperature: temperature set by remote controller
Room thermistor temperature: temperature detected by room temperature thermistor
Target temperature: temperature determined by microcomputer
Room temperature
The illustration is for CTXS, FTXS series as representative.
The load condition of the operating indoor unit
The difference between the room thermistor temperature and the target temperature
Frequency restrictions
Initial settings
Forced cooling operation
Room thermistor temperature

Common Functions

Target temperature
Set temperature
(R12321)
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