ā 4 ā
7-7-3. Remote Controller Distinction Function.......................................................................... 160
7-7-4. Pulse Motor Valve (PMV) Forced Open/Close Function in Indoor Unit ........................ 161
7-7-5. Pulse Motor Valve (PMV) Forced Open Fully/Close fully Function in Outdoor Unit .... 161
7-7-6. Solenoid Valve Forced Open/Close Function in Outdoor Unit ...................................... 162
7-7-7. Fan Operation Check in Outdoor Unit ............................................................................. 163
7-7-8. Abnormal Outdoor Unit Discrimination Method By Fan Operating Function.............. 164
7-7-9. Manual Adjustment Function of Outside Temperature (TO) Sensor ............................. 165
7-7-10. Monitor Function of Remote Controller Switch ........................................................... 167
8. TROUBLESHOOTING .......................................................................................... 169
8-1. Overview ........................................................................................................................... 169
8-2. Troubleshooting Method ................................................................................................. 170
8-3. Troubleshooting Based on Information Displayed on Remote Controller ................. 175
8-4. Check Codes Displayed on Remote Controller and SMMS-i Outdoor Unit (7-Segment
Display on I/F Board) and Locations to Be Checked .................................................... 180
8-5. Diagnosis procedure for each check code .................................................................... 195
8-6. 7-Segment Display Function ........................................................................................... 225
8-7. Oil Level Judgment Display ............................................................................................ 231
8-8. Leakage/Clogging of Refrigerating Cycle Circuit ......................................................... 235
8-8-1. Flow Selector Unit (FS Unit) ............................................................................................. 239
8-8-2. Troubleshooting when Multiple Indoor Units are Connected to Cool/Heat FS Unit .... 242
8-9. Sensor Characteristics .................................................................................................... 243
8-10. Pressure Sensor Output Check .................................................................................... 246
9. BACKUP OPERATION (EMERGENCY OPERATION) ........................................ 248
9-1. Note for Backup Operation.............................................................................................. 248
9-2. Compressor Backup Operation Setting ......................................................................... 249
9-3. Outdoor Unit Backup Operation Setting ........................................................................ 250
10. OUTDOOR UNIT REFRIGERANT RECOVERY METHOD ............................... 251
10-1. Refrigerant Recovery from Failed Outdoor Unit (Pump-Down) ................................. 251
10-1-1. Note for refrigerant recovery operation ....................................................................... 251
10-1-2. Refrigerant recovery procedure A
(Case of no outdoor unit backup operation setting) ................................................... 251
10-2. How to Operate System While Failed Outdoor Unit Being Repaired ........................ 255
10-3. Work procedure after Repair ......................................................................................... 256
11. REPLACING COMPRESSORS ......................................................................... 257
11-1. Compressor Replacement Procedure (Outline) .......................................................... 257
11-2. Replacement of Compressors ...................................................................................... 258
11-3. Check Procedure to Search Cause of Compressor Oil Shortage ............................. 262
12. OUTDOOR UNIT PARTS REPLACEMENT METHODS .................................... 264
13. P.C. BOARD EXCHANGE PROCEDURES........................................................ 277
13-1. Replacement of Indoor P.C. Boards ............................................................................. 277
13-2. Replacement of Outdoor P.C. Boards .......................................................................... 285
13-2-1. List of service P.C. boards ............................................................................................. 285
13-2-2. Configuration of inverter assembly .............................................................................. 285
13-2-3. Interface board (MCC-1606) replacement method ...................................................... 286
13-2-4. Comp-IPDU P.C. Board (MCC-1596) Replacement Procedure .................................... 287
13-2-5. Fan IPDU P.C. Board (MCC-1610) Replacement Procedure ........................................ 289
13-2-6. Noise Filter P.C. Board (MCC-1608 A, B) Replacement Procedure ............................ 290
14. EXPLODED DIAGRAM/PARTS LIST ................................................................ 293
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