Panasonic CU-3Z52TBE Service Manual page 2

TABLE OF CONTENTS
1. Safety Precautions .............................................3
2. Precaution for Using R32 Refrigerant ..............6
3. Specifications ...................................................10
3.1 CU-3Z52TBE ..............................................10
3.2 CU-3Z68TBE ..............................................12
3.3 CU-4Z68TBE ..............................................14
4. Dimensions .......................................................89
5. Refrigeration Cycle Diagram ...........................90
5.1 CU-3Z52TBE CU-3Z68TBE ......................90
5.2 CU-4Z68TBE ..............................................91
6. Block Diagram ..................................................92
6.1 CU-3Z52TBE CU-3Z68TBE ......................92
6.2 CU-4Z68TBE ..............................................93
7. Wiring Connection Diagram ............................94
7.1 CU-3Z52TBE CU-3Z68TBE ......................94
7.2 CU-4Z68TBE ..............................................95
8. Electronic Circuit Diagram ..............................96
8.1 CU-3Z52TBE CU-3Z68TBE ......................96
8.2 CU-4Z68TBE ..............................................97
9. Printed Circuit Board .......................................98
9.1 Main Printed Circuit Board .........................98
9.2 Noise Filter Printed Circuit Board ...............99
9.3 Display Printed Circuit Board .....................99
10. Installation Information................................. 100
10.1 CU-3Z52TBE ........................................... 100
10.2 CU-3Z68TBE ........................................... 101
10.3 CU-4Z68TBE ........................................... 102
11. Installation Instruction.................................. 103
11.1 Select The Best Location ........................ 103
11.2 Install The Outdoor Unit .......................... 104
11.3 Connect The Piping ................................. 104
11.4 Air Tightness Test on the Refrigerating
System..................................................... 106
11.5 Connect The Cable To The Outdoor Unit ......
................................................................. 107
11.6 Heat Insulation......................................... 109
11.7 Disposal of Outdoor Unit Drain Water ..... 109
12. Operation Control.......................................... 110
12.1 Cooling Operation.................................... 110
12.2 Heating Operation ................................... 111
12.3 Outdoor Quiet Cooling Operation Control ......
................................................................. 111
13. Simultaneous Operation Control ................. 113
14. Protection Control......................................... 114
14.1 Freeze Prevention control (Cool) ............ 114
14.2 Dew Prevention control (Cool) ................ 114
14.3 Electronic Parts Temperature Rise
Protection 1 (Cool)................................... 114
AMP Air Conditioning
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14.4 Electronic Parts Temperature Rise
Protection 2 (Cool)................................... 114
14.5 Cooling overload control (Cool)............... 115
14.6 Heating overload control (Heat) .............. 115
14.7 Extreme Low Temperature Compressor low
pressure protection control (Heat)........... 115
14.8 Deice Control........................................... 116
14.9 Time Delay Safety Control (Restart Control)..
................................................................. 116
14.10 30 seconds Force Operation ................... 116
14.11 Total Current Control ............................... 116
14.12 IPM (power transistor) Protection Control ......
................................................................. 116
14.13 Compressor Protection Control (Gas leak
detection control 1) .................................. 117
14.14 Compressor Protection Control (Gas leak
detection control 2) .................................. 117
14.15 Valve close detection control................... 117
14.16 Compressor discharge high pressure
protection control ..................................... 117
14.17 Cooling Outdoor Air Temperature Control
(Cool)....................................................... 118
14.18 Heating Outdoor Air Temperature Control
(Heat)....................................................... 118
15. Servicing Mode .............................................. 119
15.1 Pump down operation (SW1) .................. 119
15.2 Test Run Operation ................................. 119
15.3 Wiring Error Check .................................. 120
15.4 Power Save Mode ................................... 120
15.5 Mode priority function .............................. 120
15.6 Cooling only operation............................. 120
15.7 Heating only function ............................... 120
16. Troubleshooting Guide................................. 121
16.1 Self Diagnosis Function........................... 121
17. Disassembly and Assembly Instructions ... 124
17.1 Outdoor Unit Removal Procedure ........... 124
18. Technical Data ............................................... 127
18.1 Cool Mode Performance Data................. 127
18.2 Heat Mode Performance Data................. 184
19. Service Data ................................................... 253
19.1 Operation Characteristics (CU-3Z52TBE)......
................................................................. 253
19.2 Operation Characteristics (CU-3Z68TBE)......
................................................................. 265
19.3 Operation Characteristics (CU-4Z68TBE)......
................................................................. 275
20. Exploded View and Replacement Parts List......
......................................................................... 287
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