Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 265

8-10-11 Checking the Pump Motor for Ground Fault and Coil Resistance Problems ........................................ 48
8-10-12 Checking the Error-Detection Circuit on the Pump INV Board (Without load) ...................................... 48
8-10-13 Checking the Pump INV Board for Damage (Without load).................................................................. 48
8-10-14 Checking the Pump INV Board for Damage (During pump operation) ................................................. 49
8-10-15 Checking the Installation Conditions..................................................................................................... 49
8-10-16 Solutions for the Main Breaker Trip ...................................................................................................... 49
8-10-17 Solutions for the Main Earth Leakage Breaker Trip .............................................................................. 50
8-10-18 Simple Check on Inverter Circuit Components ..................................................................................... 51
8-10-19 Troubleshooting Problems with IGBT Module ...................................................................................... 52
8-10-20 Checking the Fan Inverter Heatsink for Clogging ................................................................................. 56
8-11 Control Circuit..................................................................................................................................... 57
8-11-1 Control Power Supply Function Block................................................................................................... 57
8-11-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit .............................. 62
8-12 Measures for Refrigerant Leakage .................................................................................................... 66
8-13 Parts Replacement Instructions (Outdoor Unit) .............................................................................. 68
8-13-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts)............. 68
8-13-2 Notes on Wiring Installation .................................................................................................................. 72
8-13-3 Four-way Valve Replacement Procedure ............................................................................................. 76
8-13-4 Replacement Procedure for the Check Valve Block Assembly ............................................................ 85
8-13-5 Compressor Replacement Procedure................................................................................................... 96
8-13-6 Removal Instructions for the Control Box ............................................................................................. 98
8-13-7 Maintenance Procedure for the Drain Pan.......................................................................................... 101
8-13-8 Maintenance Procedures for the Heat Exchanger .............................................................................. 107
8-13-9 Accumulator Replacement Procedure ................................................................................................ 123
8-14 HBC Maintenance Instructions (Applicable to main and sub HBCs) ........................................... 127
8-14-1 Valve Block ......................................................................................................................................... 127
8-14-2 Instructions for Debris Removal Operation ......................................................................................... 128
8-14-3 Instructions for the Air Vent Operation................................................................................................ 131
8-14-4 Preparation for servicing ..................................................................................................................... 134
8-15 Main-HBC Maintenance Instructions .............................................................................................. 138
8-15-1 Solenoid Valve Coil (SV1) Replacement Procedure (HBC)................................................................ 138
8-15-2 4-Way Valve Coils (21S4Ma, 21S4Mb) Replacement Procedure (HBC)............................................ 138
8-15-3 LEV Coils (LEV1, LEV2, LEV3) Replacement Procedure (HBC)........................................................ 139
8-15-4 Valve Motor and Valve Body Replacement Procedure (HBC)............................................................ 139
8-15-5 Valve Block Replacement Procedure (HBC) ...................................................................................... 140
8-15-6 Solenoid Valve and LEV Body Replacement Procedure (HBC) ......................................................... 141
8-15-7 Strainer Replacement Procedure (HBC)............................................................................................. 141
8-15-8 Pump Replacement Procedure (HBC)................................................................................................ 142
8-15-9 Disassembling the Pump and Replacing the Mechanical Seal (HBC)................................................ 144
8-15-10 JOINT Replacement Procedure (HBC)............................................................................................... 161
8-15-11 Thermistor (TH31) Replacement Procedure (HBC)............................................................................ 162
8-15-12 Thermistors (TH12, TH14, TH15, and TH34) Replacement Procedure (HBC)................................... 163
8-15-13 4-way Valve Body (21S4) Replacement Procedure (HBC)................................................................. 164
8-15-14 Plate Heat Exchanger Replacement Procedure (HBC) ...................................................................... 166
8-15-15 Pressure Sensor Replacement Procedure (HBC) .............................................................................. 174
8-15-16 Pressure Sensor (PS3) Replacement Procedure (HBC) .................................................................... 174
8-15-17 Water Pressure Sensor (PW1, 2, 4) Replacement Procedure (HBC)................................................. 175
8-15-18 Water Pressure Sensor (PW3) Replacement Procedure (HBC)......................................................... 175
8-15-19 Refrigerator Circuit Side Strainer Replacement Procedure (HBC) ..................................................... 176
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