Daikin FTXS30LVJU, Руководство по обслуживанию, Страница: 38 / 414

SiUS091133 Main Functions
Function and Control 28
1. Main Functions
1.1 Temperature Control
Definitions of
Temperatures The definitions of temperatures are classified as following.

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

The illustration is for FTXS series as representative.
Temperature
Control The temperature of the room is detected by the room temperature thermistor. However, there is
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
Parameters The compressor is frequency-controlled during normal operation. The target frequency is set by the
following 2 parameters coming from the operating indoor unit:

The load condition of the operating indoor unit

The difference between the room thermistor temperature and the target temperature
Additional
Control
Parameters The target frequency is adapted by additional parameters in the following cases:

Frequency restrictions

Initial settings

Forced cooling operation
Target temperature
Set temperature
Room temperature
Room thermistor temperature
(R12321)