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TABLE OF CONTENTS
PAGE PAGE
1. Safety Precautions .............................................3
2. Precaution for Using R32 Refrigerant ..............6
3. Specifications ...................................................10
3.1 CU-4Z80TBE ..............................................10
3.2 CU-5Z90TBE ..............................................12
4. Dimensions .................................................... 256
5. Refrigeration Cycle Diagram ........................ 257
5.1 CU-4Z80TBE ........................................... 257
5.2 CU-5Z90TBE ........................................... 258
6. Block Diagram ............................................... 259
6.1 CU-4Z80TBE ........................................... 259
6.2 CU-5Z90TBE ........................................... 260
7. Wiring Connection Diagram ......................... 261
7.1 CU-4Z80TBE ........................................... 261
7.2 CU-5Z90TBE ........................................... 262
8. Electronic Circuit Diagram ........................... 263
8.1 CU-4Z80TBE ........................................... 263
8.2 CU-5Z90TBE ........................................... 264
9. Printed Circuit Board .................................... 265
9.1 Main Printed Circuit Board ...................... 265
9.2 Noise Filter Printed Circuit Board ............ 266
9.3 Display Printed Circuit Board .................. 266
10. Installation Information................................. 267
10.1 CU-4Z80TBE ........................................... 267
10.2 CU-5Z90TBE ........................................... 268
11. Installation Instruction.................................. 269
11.1 Select The Best Location ........................ 269
11.2 Install The Outdoor Unit .......................... 270
11.3 Connect The Piping................................. 270
11.4 Air Tightness Test on the Refrigerating
System..................................................... 272
11.5 Connect The Cable To The Outdoor Unit ......
................................................................. 273
11.6 Heat Insulation......................................... 275
12. Operation Control.......................................... 276
12.1 Cooling Operation.................................... 276
12.2 Heating Operation ................................... 278
13. Simultaneous Operation Control ................. 279
14. Protection Control......................................... 280
14.1 Freeze Prevention control (Cool) ............ 280
14.2 Dew Prevention control (Cool) ................ 280
14.3 Electronic Parts Temperature Rise
Protection 1 (Cool)................................... 280
14.4 Electronic Parts Temperature Rise
Protection 2 (Cool)................................... 280
14.5 Cooling overload control (Cool)............... 281
14.6 Heating overload control (Heat) .............. 281
14.7 Extreme Low Temperature Compressor low
pressure protection control (Heat)........... 281
14.8 Deice Control........................................... 282
14.9 Time Delay Safety Control (Restart Control)..
................................................................. 282
14.10 30 seconds Force Operation ................... 282
14.11 Total Current Control............................... 282
14.12 IPM (power transistor) Protection Control ......
................................................................. 282
14.13 Compressor Protection Control (Gas leak
detection control 1) .................................. 283
14.14 Compressor Protection Control (Gas leak
detection control 2) .................................. 283
14.15 Valve close detection control................... 283
14.16 Compressor discharge high pressure
protection control ..................................... 283
14.17 Compressor discharge high temperature
protection control ..................................... 284
14.18 Cooling Outdoor Air Temperature Control
(Cool)....................................................... 284
14.19 Heating Outdoor Air Temperature Control
(Heat)....................................................... 284
15. Servicing Mode .............................................. 285
16. Troubleshooting Guide................................. 287
16.1 Self Diagnosis Function........................... 287
16.2 Self-diagnosis Method............................. 290
17. Disassembly and Assembly Instructions ..........
......................................................................... 313
17.1 Outdoor Unit Removal Procedure ........... 313
18. Technical Data ............................................... 316
18.1 Cool Mode Performance Data................. 316
18.2 Heat Mode Performance Data................. 514
19. Service Data ................................................... 842
19.1 Operation Characteristics (CU-4Z80TBE)......
................................................................. 842
19.2 Operation Characteristics (CU-5Z90TBE)......
................................................................. 872
20. Exploded View and Replacement Parts List......
......................................................................... 904
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