Service Manual

Function of CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121502E
44 Function and Control
1.10 INTELLIGENT EYE Operation (CTXS, FTXS Series)
Outline This function detects the existence of humans in the room with a motion sensor (INTELLIGENT
EYE) and reduces the capacity when there is nobody in the room in order to save electricity.
Detail 1. Detection method by INTELLIGENT EYE

The sensor detects human motion by receiving infrared rays and displays the pulse wave
output.

The microcomputer in the indoor unit carries out a sampling every 20 msec. and if it detects 10
cycles of the wave in 1 second in total, it judges humans are in the room as the motion signal is
ON.

The sensor may detect human motion with up to 20 msec. latency.
2. The motions (in cooling)

In FAN operation, the fan speed is reduced by 60 rpm.

When the microcomputer does not have a signal from the sensor in 20 minutes, it 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 temperature cannot be set with a remote controller, but the target
temperature is shifted internally.
1 sec.
sampling (20 msec.)
High
Low
ON
OFF
Sensor output
(R19471)
Human detection
signal
If the sensor detects the outputs
10 times/sec. or more, it judges
humans are in the room.
Human motion
ON
OFF
Reset Reset Reset
20 min.
ON
OFF
ON
OFF
Operation
OFF
Fan speed ()
Set speed Set speed
Target temperature
(R19414)
Remote controller
INTELLIGENT
EYE button
Human detection
signal
↑↑↑
within
20 min.
within
20 min.
within
20 min.