Daikin ARK25BVMB, Service Manual

Page: 46 / 201

SiBE04-302 Main Functions
Function and Control 37
1.7 Intelligent Eye
This is the function that detects existence of humans in the room by a human motion sensor
(Intelligent Eye) and reduces the capacity when there is no human in the room in order to save
electricity.
Processing 1. Detection method by Intelligent Eye
„
This sensor detects human motion by receiving infrared rays and displays the pulse wave
output.
„
A microcomputer 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 microcomputer doesn’t have a signal from the sensor in 20 minutes, it judges that
nobody is in the room and operates 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.
If the sensor detects the outputs 10 times/sec.
or more, it judges humans exist.
1sec
sampling (20msec)
High
Low
ON
OFF
Sensor output
(Human motion)
Human detection
signal
(R2821)
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
Operation
OFF
Fan speed (
H
1)
Set speed - 50 rpm
Set speed Set speed
in case of
thermostat-off
Frequency at set temp. + 2˚C
Set temp.
(R2822)
Remote controller
Intelligent Eye
button