Main Functions; Temperature Control; Frequency Principle - Daikin SUPER MULTI NX CTXS07JVJU Service Manual

Super multi nx g-series / j-series
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Main Functions

1. Main Functions

1.1

Temperature Control

Definitions of
The definitions of temperatures are classified as following.
Temperatures
 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
Temperature
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
Control
"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 frequency of the compressor is controlled by the following 2 parameters:
 The load condition of the operating indoor unit
Parameters
 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
35
Room thermistor temperature
Room temperature
 The illustration is for CTXS/FTXS series as representative.
SiUS12-928_B
Target temperature
Set temperature
(R12321)
Function and Control

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