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13

Unused

Fan speed adjust (10 to 12)

Fan speed adjust (6 to 9)

Fan speed adjust (1 to 5)

Blower temperature compensation

Unused

Outdoor rating (heater)

Outdoor rating (cooler)

GND

Oscillator (8 MHz)

Oscillator (8 MHz)

Reset

Buzzer

Serial in

Serial out

Preheat switch

Wireless switch

Model select 7

Model select 6

Model select 5

Fan speed

Unused

Unused

+5V

Power supply clock

GND

SCL (E

2

PROM)

SDA (E

2

PROM)

Unused

GND

NC

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

P53

P52

P51

P50

P33

P32

P31

P30

AGND

CK

2

CK

1

RESET

F

P46

P45

P44

P43

P42

P41

P40

KH

P66

P65

P64

P63

GND

P62

P61

P60

OSC

IN

OSC

OUT

TEST

Input

Input

Input

Input

Input

Input

Input

Input

Input

Output

Input

Input

Output

Input

Output

Input

Input

Input

Input

Input

Input

Output

Output

Input

Input

Input

Output

In/output

Input

Input

Output

Input

Port

No.

Port

name

Input/

Output

Application

14

Model select 4

Model select 3

Model select 2

Model select 1

Auxiliary mode switch (push switch)

Unused

Power on

Unused

Wireless signal

Run LED

Timer LED

Unused

Unused

Unused

Main relay

Unused

Fan gate signal

Louvre motor

Louvre motor

Louvre motor

Louvre motor

Unused

Unused

Unused

Unused

GND

+5 V

+5 V

Test (?)

Indoor temperature thermo

Indoor heat exchanger thermo

Unused

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

P27

P26

P25

P24

P23

P22

P21

P20

KI

P17

P16

P15

P14

P13

P12

P11

P10

P07

P06

P05

P04

P03

P02

P01

P00

GND

V

SS

V

R

P57

P56

P55

P54

Input

Input

Input

Input

Input

Input

Input

Input

Input

Output

Output

Output

Output

Output

Output

Output

Output

Output

Output

Output

Output

Output

Output

Output

Output

Input

Input

Input

Input

Input

Input

Input

Port

No.

Port

name

Input/

Output

Application

15

Outdoor

CPU

Test mode circuit

LED drive circuit

Winter kit circuit (option)

Heat exchanger thermo
circuit

Compressor thermo circuit

CPU reset circuit

Serial I/O circuit

IPM drive circuit

4-way valve relay drive
circuit

Outdoor fan relay drive
circuit

Power supply
circuit (built
into IPM)

CPU oscillator circuit

AC overcurrent detection
circuit

DC overcurrent detection
circuit

Outdoor temperature thermistor (option)

Heat exchanger pipe thermistor (option)

LED

Heat exchanger
thermistor

Compressor thermistor

Current transfer

Compressor

IPM

4-way valve (except for
the AU-X095E/X075E)

Outdoor fan

Smoothing
circuit

Active filter
circuit

Filter
circuit

Unit-unit
wiring (AC
power and
serial
signals)

13 A

protection

3 A

protection

10 A protection

16

This is an internal oscillator circuit to operate the CPU IC1 itself. The externally mounted ceramic oscillator, ceramic
condenser and resistor yield a stable 8.00 MHz oscillation. The ceramic capacitor is built into OSC1.

The outdoor unit control circuit is composed of an electronic control circuit centered around the outdoor control PCB
and an inverter for generating the voltage applied to the compressor.

The outdoor control PCB is constructed around a CPU. It receives the serial signals sent by the indoor unit, and
generates various corresponding signals in response. At the same time, it provides additionalcontrol for the outdoor unit
itself, resulting in overall control of the air conditioner.

The inverter controls the frequency of the compressor rotation. It operates the IPM according to the control signals sent
by the outdoor control PCB. The PWM method allows free control of the frequency and voltage, giving a wide range of
performance variations.

The 5V voltage is divided across R46 and R47 and the analog voltage is input to CPU IC1 pin 8. The CPU converts the
analog voltage to a digital value using an internal AD conversion circuit to select from among 8 models.

5V

R46

R47

CPU (IC1) pin 8

OSC

CPU (IC1) pin 10
CPU (IC1) pin 11