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8-2. Outdoor Unit (Inverter Assembly)
220–240 V ~50Hz
MICRO-COMPUTER BLOCK DIAGRAM
Driver circuit
of P.M.V.
Indoor unit
send/receive
circuit
Relay
circuit
Noise
Filter
Converter
(AC → DC)
Clock
frequency
4MHz
High Power
factor Correction
circuit
Input current
sensor
• PWM synthesis function
• Input current release control
• IGBT over-current detect control
• Outdoor fan control
• High power factor correction control
• Inverter output frequency control
• A/D converter function
• P.M.V. control
• Discharge temp. control
• 4-way valve control
• Signal communication to indoor unit
P.M.V. : Pulse Motor Valve
M.C.U. : Micro Control Unit
M.C.U
For INDOOR UNIT
4-way
valve
P.M.V.
Inverter
(DC → AC)
Gate drive
circuit
Gate drive
circuit
Inverter
(DC → AC)
Heat exchanger
temp.sensor (TE)
Suction temp.
sensor (TS)
Outdoor air
temp. sensor (TO)
Discharge
temp. sensor (TD)
Outdoor
Fan motor
220
−
230V ~60Hz
MCC5009 (P.C.B) OUTDOOR UNIT
Current
detect
Current
detect
Compressor
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