Hitachi RAF-25NH4 Données Techniques page 171

7. Initial Setting Circuit (IC401)
¥ When power is supplied, the micro computer reads the data in IC401 (E
activation value and the rating and maximum speed of the compressor, etc. to their initial values.
1
2
3
4
2
IC401(E PROM)
0V
8. Temporary Switch
INDICATION P.W.B.
5V
C1
C2
Temporary
M1
Switch
M2
¥ The temporary switch is used to operate the air conditioner temporarily when the wireless remote control is
lost or faulty.
¥ The air conditioner operates in the previous mode at the previously set temperature. However, when the
power switch is set to OFF, it starts automatic operation.
9. Drain pump drive circuit
When cool or dehumidifying operation, pin
Micro computer
Drain pump
5V
8
C401
7
0V 0V
6
5
5V
1
C605
2
R602
3
4
CN7
C606
R604
0V
CN11
1
C609
0V
30
L943 R941
30
R942
0V
5V
5V
R406
R405
Fig. 7-1
R702
R603
C607
Fig. 8-1
of the micro computer goes "Hi", Q905 turn on and the drain pump drive.
D941
Q941
L942
0V
Fig. 9-1
190
2
PROM) and sets the preheating
Micro computer
52 SCL
｝ External ROM
SDA
51
36 HA input
HA output
24
C602
0V 0V
21V
L941
RED
3
BLK
1
CN11
Micro computer
Drain pump motor