Hitachi RAS-8FSXN - Page 6

10.4 Removing the electrical box....................................................................................................... 295
10.4.1 Removing the electrical box for RAS-(8-12)FSXN...................................................................... 295
10.4.2 Removing the electrical box for RAS-(14-18)FSXN.................................................................... 295
10.5 Removing the electrical box stay................................................................................................ 296
10.5.1 Removing the electrical box stay for RAS-(8-12)FSXN.............................................................. 296
10.5.2 Removing the electrical box stay for RAS-(14-18)FSXN............................................................ 296
10.6 Removing the air grille................................................................................................................ 297
10.7 Removing the outdoor fan.......................................................................................................... 298
10.8 Removing the compressor......................................................................................................... 300
10.9 Replacing the refrigerant oil....................................................................................................... 308
10.9.1 No clogging in return oil circuit.................................................................................................... 308
10.9.2 Clogging in return oil circuit......................................................................................................... 309
10.10 Replacing the return oil circuit.................................................................................................... 311
10.11 Removing the coils..................................................................................................................... 312
10.11.1 Removing the expansion valve coil (MV1, MVB)........................................................................ 313
10.11.2 Removing the solenoid valve coil (SVA, SVG)........................................................................... 314
10.11.3 Removing the solenoid valve...................................................................................................... 314
10.11.4 Removing the reversing valve coil (RVR1, RVR2)...................................................................... 315
10.11.5 Removing the reversing valve..................................................................................................... 315
10.12 Removing the stop valve............................................................................................................ 317
10.13 Removing the high pressure switch, high pressure sensor and low pressure sensor................ 318
10.13.1 Removing the high pressure switch (PSH1, PSH2).................................................................... 319
10.13.2 Removing the high pressure sensor (Pd) and low pressure sensor (Ps).................................... 319
10.14 Removing the liquid pipe thermistor........................................................................................... 320
10.15 Removing the ambient temperature thermistor.......................................................................... 322
10.16 Removing other electrical components...................................................................................... 323
10.16.1 Removing the PCB1 and electrical components for the electrical box....................................... 323
10.16.2 Removing the PCB2 for the inverter........................................................................................... 325
10.16.3 Removing the diode module and transistor module.................................................................... 325
10.16.4 Removing the fan controller........................................................................................................ 327
10.16.5 Fitting the electrical box.............................................................................................................. 327
11 Electrical checks of the main parts................................................................ 329
11.1 Inverter....................................................................................................................................... 330
11.1.1 Inverter specifications................................................................................................................. 330
11.1.2 Inverter power Unit structure....................................................................................................... 331
11.1.3 Protection function...................................................................................................................... 332
11.1.4 Overload protection control......................................................................................................... 333
11.2 Scroll compressor....................................................................................................................... 334
11.2.1 Reliable mechanism for low vibration and low sound................................................................. 334
11.2.2 Compression principles............................................................................................................... 334
11.2.3 Structure..................................................................................................................................... 334
11.2.4 Compressor type......................................................................................................................... 335
11.3 Thermistors................................................................................................................................ 336
11.3.1 Thermistor positions.................................................................................................................... 336
11.3.2 Thermistor for the temperature of the upper part of the compressor.......................................... 337
11.3.3 Thermistor for the outdoor ambient temperature........................................................................ 338
11.3.4 Thermistor for the evaporating temperature of the outdoor unit in the heating operation (For
defrosting)................................................................................................................................... 338
Index
vi
SMGB0065 rev. 1 - 12/2010