Main Functions; Temperature Control; Frequency Principle - Daikin H Series Service Manual

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
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
Parameters 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
The target frequency is adapted by additional parameters in the following cases:
 Frequency restrictions
Control
 Initial settings
Parameters
 Forced cooling operation
Function and Control
Room thermistor temperature
Room temperature
SiUS04-924_A
Target temperature
Set temperature
(R12321)
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