Hitachi RAK-25PSEW - 13. Infrared Human Presence Sensor Circuit

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13. Infrared human presence sensor circuit
With the infrared sensor,the air conditioner can detect the activity level in a room and adjust the
temperature and humidity automatically,thus achieving the purpose of energy saving.
When the activity level in a room is detected,the infrared sensor will be in operation.
And a low-voltage output from the infrared sensor P.W.B. will be magnified by the amplifier comparator
and be transformed the digital signal to microcomputer (MICON).
(The infrared sensor output is [Hi] when the activity level is not detected. On the contrary,output is [Lo].)
If the connector(CN22) is not inserted, it will be considered as no infrared sensor, and no self-diagnosis
indication.
Fig.13
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Sensor P.W.B
Indoor main P.W,B
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R731
IC1
(1/2)
IC1
(2/2)
IC2
C630
0V
0V
5V
5V
R732
Microcomputer
Infrared sensor
PIR
5
1
2
3
1
2
3
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