Specifications
SiBE04-624 Main Functions
Function and Control 19
How to Check the
Motion of
Humidifying
Operation
You can check whether the humidifying unit is in good working order. If you set “the humidifying
only test operation” (refer to the installation manual for details), you can check even beyond the
range of the conditions for humidifying operation mentioned above.
1. Hygroscopic fan .......................... Air is exhaled from the front exhaust outlet of outdoor unit.
2. Humidifying fan/heater/damper ... Warm air is blown from the duct of outdoor unit.
3. Humidification rotor ..................... The rotor is rotating with top panel off.
As for the performance, estimate from psychrometric chart with the measured temperature and
humidity of the outdoor air and of the humidified air (in front of the indoor outlet) using thermal
hygrometer.
Humidity
Fluctuation by
Temperature
Settings
At Humidifying 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
moisture content is the same.
e.g.) The rise in the room temperature from 15°C to 25°C will result in the rise 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 (floor space, ventilation frequency, number of residents, etc.) and
temperature settings (mostly higher settings) may result in unsatisfactory humidity settings.
Performance class Air flow rate (m
3
/min)
2.8kW 0.40
4.2, 5.0kW 0.44
90
100
Humidity
(%)
80
70
60
50
40
30
20
10
0
20 40 60 80 100 Time (min.)
17
Setting temp.
“Humidifying Heating” start
20
23
Heating
without humidifying
setting temp. 23
Humidity Fluctuation on Humidifying Heating Operation
When room temperature rises,
relative humidity is lowered
even if the moisture
content is same.
Humidity rises
gradually.
(R5952)
Measurement Conditions
Outdoor temp.: 7
Humidify heating operation setting:
Temp.; each setting as below, Humidify; “CONT” (Continue)
Airflow rate setting: H tap
Area of the room: 26.4 m²
Humidifying hose length: 7.5 m
Ventilation: 0.75 times/hour
0.5 times of natural ventilation
0.25 times of humidity absorption by a carpet, a curtain, etc.