Daikin SiBE04-624_B_FTXR-E Service Manual page 34

Main Functions
Humidity During HUMID HEATING operation, as room temperature rises, relative humidity is temporarily
lowered. This is because as room temperature rises, relative humidity is lowered even if the
Fluctuation by
moisture content is the same.
Temperature
Settings
EX: The rise in the room temperature from 15°C to 25°C results in the fall in humidity from
40%RH to about 22%RH.
As humidifying operation starts concurrently with heating, humidity rises gradually as shown in
the figure below.
Some room conditions (room size, ventilation frequency, number of residents, etc.) and set
temperature (higher temperature) may result in unsatisfactory humidity.
Humidity
24
Humidity Fluctuation on HUMID HEATING Operation
(%)
100
90
HUMID HEATING start
80
When room temperature rises,
70
relative humidity is lowered
even if the moisture
content is same.
60
50
40
30
20
10
0
20
Measurement conditions
Outdoor temp.: 7˚C
Humidity setting: CONT (continuous)
Airflow rate setting: H tap
Area of the room: 26.4 m²
Humidifying hose length: 7.5 m
Ventilation rate: 0.75 times/hour
0.5 times of natural ventilation
0.25 times of humidity absorption by a carpet, a curtain, etc.
40 60
SiBE04-624_B
Set temp.
17˚C
20˚C
23˚C
Humidity rises
gradually.
Heating without
humidifying
Set temp. 23˚C
80 100 Time (min.)
(R13861)
Function and Control