Service Manual

Main Functions SiUS041638E
21 Functions and Control
1.10 INTELLIGENT EYE Operation
Outline This function detects the presence of humans in the room with a motion sensor and reduces the
capacity when there is nobody in the room in order to save electricity.
Details 1. INTELLIGENT EYE detection method

The motion sensor detects human motion by receiving infrared rays and sends the pulse wave
output.

The microcomputer in the indoor unit carries out a sampling every 20 msec. If the motion sensor
detects 10 times or more of the wave output in one second in total, and the High signal
continues for 3 sec., the microcomputer judges humans are in the room as the human detection
signal is ON.
2. Motions (in cooling)

In FAN operation, the fan speed is reduced by 60 rpm when no one is in the area.

When there is no signal from the motion sensor in 20 minutes, the microcomputer judges that
nobody is in the room and operates the unit at a temperature shifted from the target
temperature. (Cooling/Dry: 1 ~ 2°C (1.8 ~ 3.6°F) higher, Heating: 2°C (3.6°F) lower, Auto:
according to the operation mode at that time.)
Note: For dry operation, the target temperature is shifted internally. The temperature cannot be set with
the remote controller.
1 sec.
Sampling (20 msec.)
High
Low
ON
OFF
High
Low
(R24035)
(Condition of 10 times or more output)
Human motion
3 sec.
If the detection signal (High) continues for 3 sec. or more,
the microcomputer judges humans are in the room.
Detection signal
from the motion
sensor
Human detection
signal
Motion sensor
output
If the motion sensor detects the outputs
10 times/sec. or more, the microcomputer
judges the detection signal from the
motion sensor is High.
ON
OFF
Reset Reset Reset
20 min.
1 ~ 2˚C (1.8 ~ 3.6 ˚F)
ON
OFF
ON
OFF
Operation
OFF
Fan speed (+)
Set speed Set speed
Target temperature
(R23920)
Remote controller
Sensor button
Human detection
signal
↑↑
60 rpm
↑
within
20 min.
within
20 min.
within
20 min.