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ESCRIPTION OF MAIN CIRCUIT OPERATION
MODEL RAF-25NH5, RAF-35NH5, RAF-50NH5
. Power circuit
35V
CP2
R 2
CP
Q 5
Q 3
＋
＋
−
−
0V
OVER-CURRENT
CONTROL CIRCUIT
Power to operate indoor unit (DC35V) is generated at the power supply in outdoor unit and it is sent to indoor unit
through the connecting cord C and D.
Then, DC 2V ( 2V line) is generated using DC/DC converter from the voltage sent from outdoor unit, as the
control voltage of 2V is required to drive the stepping motor and others.
Furthermore, 5V (5V line), which is necessary to drive the microcomputer and to control the fan motor, is generated
using three-terminal regulator IC 2 .
All manuals and user guides at all-guides.com
2V
DC/DC
CONVERTER
CJ 0
Q
L
R 4
Q 2
5
5
＋
R 5
2
7
IC
D
6
3
4
Q 4
Fig. 1−1
- 240 -
FAN-MOTOR
POWER-SUPPLY
CONTROL CIRCUIT
CJ 02
Q 3
D 2
C 33
IC 2
IN
OUT
5V
GND
＋
−
C 22
0V
THREE TERMINAL
REGULATOR
CN 0
XA-5P-TOP(RED)
6
INDOOR
UPPER FAN
5
MOTOR
M
4
3
2
CN 5
XA-5P-TOP
6
INDOOR
LOWER FAN
5
MOTOR
4
M
3
2
POWER SUPPLY
25
CONTROL OUTPUT
54
LOWER FM FEEDBACK
DCFAN
39
OUTPUT LOWER FAN
53
UPPER FM FEEDBACK
DCFAN
40
OUTPUT UPPER FAN
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