Table Of Contents - Panasonic CU-4E24RBU Service Manual

TABLE OF CONTENTS

1. Safety Precautions ............................................. 3
2. Specifications ..................................................... 5
2.1 CU-3E19RBU ............................................... 5
2.2 CU-4E24RBU ............................................... 7
3. Dimensions ....................................................... 16
3.1 CU-3E19RBU ............................................. 16
3.2 CU-4E24RBU ............................................. 16
4. Refrigeration Cycle Diagram ........................... 17
4.1 CU-3E19RBU ............................................. 17
4.2 CU-4E24RBU ............................................. 18
5. Block Diagram .................................................. 19
5.1 CU-3E19RBU ............................................. 19
5.2 CU-4E24RBU ............................................. 20
6. Wiring Connection Diagram ............................ 21
6.1 CU-3E19RBU ............................................. 21
6.2 CU-4E24RBU ............................................. 22
7. Electronic Circuit Diagram .............................. 23
7.1 CU-3E19RBU ............................................. 23
7.2 CU-4E24RBU ............................................. 24
8. Printed Circuit Board ....................................... 25
8.1 Main Printed Circuit Board ......................... 25
8.2 Noise Filter Printed Circuit Board ............... 27
8.3 Display Printed Circuit Board ..................... 28
9. Installation Information .................................... 29
9.1 CU-3E19RBU ............................................. 29
9.2 CU-4E24RBU ............................................. 30
10. Installation Instruction ..................................... 31
10.1 CU-3E19RBU ............................................. 31
10.2 CU-4E24RBU ............................................. 36
11. Operation Control ............................................. 41
11.1 Cooling Operation ....................................... 41
11.2 Heating Operation ...................................... 42
12. Simultaneous Operation Control .................... 43
13. Protection Control ............................................ 44
13.1 Freeze Prevention control (Cool) ............... 44
13.2 Dew Prevention control (Cool) ................... 44
13.3 Electronic Parts Temperature Rise
Protection 1 (Cool) ...................................... 44
13.4 Electronic Parts Temperature Rise
Protection 2 (Cool) ...................................... 44
13.5 Cooling overload control (Cool) .................. 45
13.6 Heating overload control (Heat) ................. 45
13.7 Extreme Low Temperature Compressor
low pressure protection control (Heat) ....... 46
13.8 Deice Control .............................................. 46
13.9 Time Delay Safety Control
(Restart Control) ......................................... 46
13.10 30 seconds Force Operation ...................... 46
13.11 Total Current Control .................................. 46
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13.12 IPM (power transistor) Protection
Control ........................................................47
13.13 Compressor Protection Control
(Gas leak detection control 1) ....................47
13.14 Compressor Protection Control
(Gas leak detection control 2) ....................47
13.15 Valve close detection control ......................48
13.16 Compressor discharge high pressure
protection control ........................................48
14. Servicing Mode .................................................49
14.1 CU-3E19RBU .............................................49
14.2 CU-4E24RBU .............................................51
15. Troubleshooting Guide ....................................53
15.1 Self Diagnosis Function ..............................53
15.2 Self-diagnosis Method ................................55
16. Disassembly and Assembly Instructions ......79
16.1 Outdoor Unit Removal Procedure
(CU-3E19RBU) ...........................................79
16.2 Outdoor Unit Removal Procedure
(CU-4E24RBU) ...........................................81
17. Technical Data ..................................................84
17.1 CU-3E19RBU .............................................84
17.2 CU-4E24RBU .......................................... 108
18. Exploded View and Replacement Parts
List .................................................................. 191
18.1 CU-3E19RBU .......................................... 191
18.2 CU-4E24RBU .......................................... 194
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