General Functionality
Si04-115
30
Main Function
1.10
Intelligent Eye
Outline
The function that detects existence of humans in the air-conditioned room and reduces the
capacity when no humans are available in the room in order to save electricity by means of a
human motion sensor.
Processing
1. Detection method by human motion sensor
"
This sensor detects human motion by receiving infrared rays and displays the pulse wave
output.
"
A micro computer in an indoor unit carries out a sampling every 20 msec. and if it detects 10
cycles of the wave in one second in total (corresponding to 20msec.× 10 = 100msec.), it
judges human is in the room as the motion signal is ON.
2. The motions (for example: in cooling)
"
When a micro computer doesn’t have a signal from the sensor in 20 minutes, it judges that
no body is in the room and turns off the human detection LED, operating the unit in
temperature sifted 2°C from the set temperature. (Cooling : 2°C higher, Dry: 1°C higher and
Auto : according to the operation mode at that time.)
!
1
In case of Fan mode, the fan speed reduces by 50 rpm.
"
Since the set temperature is shifted by 2°C higher for 40 minutes, compressor speed
becomes low and can realize energy saving operation. But as thermostat is prone to be off
by the fact that the set temperature has been shifted, the thermostat-off action is prohibited
in 40 minutes so as to prevent this phenomena.
After this 40 minutes, the prohibition of the thermostat-off is cancelled and it can realize the
If the sensor detects the outputs 10 times/sec.
or more, it judges humans are available.
1sec
sampling (20msec)
High
Low
ON
OFF
Sensor output
(Human motion)
Human detection
signal
(R1915)
ON
OFF
RESET.
C/O Set temp. + 2˚C
H/P Set temp. - 2˚C
Human detection
signal
20 min.
20 min.
within 20
minutes.
40 min.
MaxHz
Mi nHz
0Hz
Compressor
speed
The lower limit by detecting
human.
(Prohibition of thermostat-off)
ON
OFF
ON
OFF
Human motion
detection LED
Remote controller
human motion
detection signal
Sensor button
ON
OFF
Operation
OFF
Fan speed (
H
1)
34Hz
Set speed - 50 rpm
Set speed
Set speed
in case of
thermostat-off
Frequency at set temp. + 2˚C
Set temp.
(R1916)
