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5

The 5V power for the indoor control circuit is generated when the indoor power socket is plugged in. At the same instant
as the 5V power is generated, C13 becomes conductive, the base of transistor Q3 goes HIGH (5V), and Q3 goes ON.
When Q3 goes ON, CPU IC1 pin 12 goes LOW resetting the CPU. Afterwards, C13 becomes charged and non-
conductive, Q3 goes OFF, and CPU IC1 pin 12 becomes HIGH input. When this happens, the CPU operation starts and
control is performed.

+

C14

D8

Q3

R17

C13

5V

–

CPU (IC1) pin 12

5V

0V

5V

0.5 sec.

0V

CPU pin 12
input voltage

5V Power supply waveform

Power plug
inserted

6

This is an internal oscillator circuit to run the CPU IC1 itself. The externally mounted ceramic oscillator and ceramic
capacitor yield a stable 8.00 MHz oscillation. The ceramic capacitor is built into OSC.

This circuit supplies 220/240 V AC to the outdoor control circuit. IC2 is a transistor array to drive RY1. A transistor is
used because the relay cannot be driven directly by the CPU.

This circuit generates the clock signal. It reshapes the power supply frequency to obtain a pulse waveform.

D3

D1

D4

R5

R4

D2

C8

Q1

R6

5V

CPU (IC1) pin 25

Transformer Secondary

C7

a

Transformer
Secondary

Transistor Q1
Base

CPU (IC1)
pin 25

GND

GND

OSC

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

RY1

IC2

CPU (IC1) pin 47
H : relay on
H : relay off

220/240

VAC

1

Terminal
Block

12V

7

The 220/240 V AC shown in the above diagram is generated when the indoor power socket is plugged in. It undergoes
half-wave rectification by diode D6, then is smoothed by the electrolytic capacitor C18, and a stable voltage of 24 V DC
is provided at the Zener Diode ZD2. The above circuit provides a 24 V DC power supply to the serial communication
circuit.

When the indoor CPU turns on the outdoor main relay, the outdoor power supply is turned on and the outdoor CPU
enters serial signal wait state - i.e. the circuit between terminals (N) and (2) in the diagram above becomes conductive
and the circuit waits for a signal from the indoor circuit. The indoor circuit sends signals to the outdoor circuit by setting
CPU IC1 pin 15 to LOW/HIGH output, which sets photo coupler PC2 ON/OFF. When the indoor circuit has finished
sending its signals, it sets CPU IC1 pin 15 to LOW setting PC2 to the ON state. This switches the indoor circuit to signal
wait state from the outdoor circuit. The signals from the outdoor circuit are input to indoor CPU IC1 pin 14 by turning
photo coupler PC1 ON and OFF.

This circuit generates the beeps when the remote control signal is received. One beep is generated when an approximately
4 kHz pulse is generated for approximately 0.1 seconds from CPU IC1 pin 13. The CPU cannot drive the buzzer
directly, so Q2 is used to drive the buzzer.

+

C15

–

C19

C18

ZD2

R27

R26

D6

N

R25

R23

D7 R44

R42

R43

R41

R40

PC2

PC1

5V

R19

R24

2

AC 220/240V

CPU (IC1) pin 15

CPU (IC1) pin 14

Terminal Block

R18

Q2

BZ

12V

CPU (IC1) pin 13

8

HIGH or LOW is input to the CPU depending on whether or not each jumper line is connected. When the jumper line is
connected, the 5V becomes directly connected and the input becomes HIGH. If the jumper line is disconnected, the
input is pulled LOW by the internal pull-down resistor in the CPU port. The CPU receives this HIGH/LOW input and
switches its programming specifications accordingly.

The remote control sends a waveform composed of a carrier waveform and a signal waveform as an infrared signal.
The light receiver unit removes the carrier waveform leaving only the signal waveform and inputs it to the CPU.

LED 101 and LED 102 are lit by sending a LOW output from CPU IC1 pins 42 and 43. These LED's are lit when the unit
is in operation or when the timer is set.

+
–

5V

Light receiver unit

C9

C102

C101

CPU (IC1) pin 40

CPU (IC1) pin 41

R9

R10

5V

LED101

LED102

R11

CPU (IC1) pin 43

CPU (IC1) pin 42

5V

Jumper

CPU (IC1) 

Outdoor unit minimum frequency

       ––––

Model switch

Outdoor unit maximum frequency

       ––––

Model switch

       ––––

Wireless switch

Pre-heat function

 

Jumper

Yes

No

Up

                                 ––––

Cooler only

Down

                                 ––––

X075

                                 ––––

Switch

No pre-heat

Normal

Cooler/heater

Normal

  

X095

Normal

Pre-heat