2-1
12PHR-N
CHAPTER 2. EXPLANATION OF CIRCUIT AND OPERATION
[1] BLOCK DIAGRAMS
1. Indoor unit
CPU
DC power supply circuit
Rectification circuit
AC Power
Fan motor PWM control circuit
Indoor fan motor
Rotation pulse input circuit
Fan motor pulse detect
AC clock circuit
Remote controller signal reception circuit
Wireless remote control operation
Buzzer driver circuit
Audible operation confirmation
CPU reset circuit
CPU oscillator circuit
Room temp detect circuit
Room temp. thermistor
Heat exchange pipe themo circuit
Heat exchanger pipe thermistor
EEPROM
Louvre angle,fan speed
Select circuit
Heat only, Model select
Serial I/O circuit
Indoor/Outdoor control signal I/O
Unit-unit wiring
(AC power and
Auto restart circuit
serial signals)
Test run circuit
Test run (forced operation)
Auxiliary mode
Auxiliary mode button ON/OFF
Power on circuit
Selfdiagnostics,fault diagnosis
Cluster generator drive circuit
Cluster generator
Louver motor drive circuit(Horizontal)
How direction control(Horizontal louver
motor)
Louver motor drive circuit(Vertical, right)
How direction control(Vertical louver
motor,right)
Louver motor drive circuit(Vertical,left)
How direction contorl(Vertical louver
motor,left)
LED Drive circuit
LED display
3.15A
Fuse
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