Hitachi RAC-10SH3, Руководство по обслуживанию

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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(IC601).
11. Infrared human presence sensor circuit
With the infrared senson,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.
Fig.11
－
1
4
2
3 PIR
PIR
1
1
3
2
4
5V
R737
R734
R733
5V
R731
R732
0V
0V
0V
70
69
ＰＩ
Ｒ
１（
Left
）
ＰＩ
Ｒ
１
(
Right
）
IC1
(1/2)
IC1
(2/2)
IC2
IC3
(1/2)
IC3
(2/2)
IC4
Sensor P.W.B. Control P.W.B.
－
+ +
－
+
－
+
－
－
+ +
－
+
－
+
－
C731
C732
IC601
Infrared sensor,
Left
Infrared sensor,
right
The infrared sensor output is [Hi] when the activity level is not detected. On
the contrary,output is [Lo].
The area in front of the indoor unit is divided into 3 parts(the left area,central
area and right area). Accordingto the 3 areas,the infrared sensor detect the
position of people.
The left-hand chart is displaying the operation of the infrared sensor when
detecting the person moving from the left area to the right.
Check
When the infrared sensor is in failure,the output digital signal is [Hi].If the sensor is in failure but the
output digital signal is [Lo],the infrared sensor lamp will be blinking (on for 4 seconds,off for 1 second).
And necessarily it usually takes 1 hour at most to operate the failure diagnosis mode.Therefore, infrared
sensing failure diagnosis service mode can be used to shorten the failure diagnosis time to 1 minute 30
seconds.
※ Refer to diagnosis flow(page 9 9 )
[Infrared sensing failure diagnosis service mode]
1.Turn off the power supply.
2.Press the [Stop] button by remote controller.
3.Press the [Air cleaning] button by remote controller.
4.Ture on the power supply.
5.Next to press [Dynamic air deflection] button.
6.After about 1 minute 30 seconds,if it is in failure, the infrared sensor lamp will be blinking(on for 4
seconds,off for 1 second).
(During the failure diagnosis,you could wave your hand in front of the infrared sensor to assist
diagnosis.)
microcomputer
Infrared
sensor(left)
Infrared
sensor(right)