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SiBE12-908
Table of Contents
iv
2.24 Damper Abnormality.............................................................................142
2.25 Position Sensor Abnormality ................................................................143
2.26 DC Voltage / DC Current Sensor Abnormality .....................................145
2.27 Thermistor or Related Abnormality (Outdoor Unit)...............................146
2.28 Abnormal Temperature in Electrical Box..............................................148
2.29 Temperature Rise in Radiation Fin.......................................................150
2.30 Output Overcurrent...............................................................................152
2.31 Refrigerant Shortage ............................................................................154
2.32 Over Voltage Protection / Low Voltage Protection ...............................156
2.33 Outdoor Unit PCB Abnormality or
Communication Circuit Abnormality .....................................................157
2.34 Signal Transmission Error on Outdoor Unit PCB .................................160
2.35 Fan Motor System Abnormality / Fan Lock ..........................................162
2.36 Heater Wire Abnormality ......................................................................163
2.37 Humidifying Fan Outlet Thermistor Abnormality / Heater
Temperature Abnormality.....................................................................165
2.38 Lights-out of Microcomputer Status Lamp............................................167
3. Check ..................................................................................................168
3.1
Fan Motor Connector Output Check ....................................................168
3.2
Thermistor Resistance Check ..............................................................169
3.3
Installation Condition Check.................................................................170
3.4
Outdoor Fan System Check (DC Motor) ..............................................170
3.5
Power Supply Waveform Check...........................................................171
3.6
Main Circuit Electrolytic Capacitor Check ............................................171
3.7
Refrigerant System Check ...................................................................172
3.8
“Inverter Checker” Check .....................................................................173
3.9
Power Transistor Check .......................................................................174
3.10 Discharge Pressure Check...................................................................175
3.11 Electronic Expansion Valve Check.......................................................176
3.12 Rotating Pulse Input on Outdoor Unit PCB Check ...............................177
3.13 Main Circuit Short Check......................................................................179
3.14 Four Way Valve Performance Check ...................................................180
Part 7 Removal Procedure ........................................................181
1. Indoor Unit...........................................................................................182
1.1
Removal of Air filter ..............................................................................182
1.2
Removal of Front Panel........................................................................185
1.3
Removal of Front Grille ........................................................................187
1.4
Removal of Horizontal Blades and Vertical Blades ..............................190
1.5
Removal of Electrical Box ....................................................................194
1.6
Removal of PCB...................................................................................197
1.7
Removal of the Connecting Duct..........................................................202
1.8
Removal of Heat Exchanger ................................................................203
1.9
Removal of Swing Motor ......................................................................206
1.10 Removal of Fan Rotor ..........................................................................210
2. Outdoor Unit........................................................................................213
2.1
Removal of Humidifier Unit...................................................................213
2.2
Removal of Heater ASSY / Humidifying Rotor
(Moisture Adsorption Element) / Humidifying Rotor Motor ...................216
2.3
Removal of Damper Motor ...................................................................220
2.4
Removal of Limit Switch / Humidifying Thermistor ...............................222