Specifications, designs and contents in this Service Manual are subject to change without notice.
2
TABLE OF CONTENTS
PAGE PAGE
1. Safety Precautions ............................................. 3
2. Precaution for Using R32 Refrigerant .............. 6
3. Specifications ................................................... 10
4. Features ............................................................. 20
5. Location of Controls and Components .......... 21
5.1 Indoor Unit .................................................. 21
5.2 Outdoor Unit ............................................... 21
5.3 Remote Control .......................................... 21
6. Dimensions ....................................................... 22
6.1 Indoor Unit .................................................. 22
6.2 Outdoor Unit ............................................... 23
7. Refrigeration Cycle Diagram ........................... 25
7.1 CS-Z25UB4EAW CU-Z25UBEA
CS-Z35UB4EAW CU-Z35UBEA ............... 25
7.2 CS-Z50UB4EAW CU-Z50UBEA
CS-Z60UB4EAW CU-Z60UBEA ............... 26
8. Block Diagram .................................................. 27
8.1 CS-Z25UB4EAW CU-Z25UBEA
CS-Z35UB4EAW CU-Z35UBEA ............... 27
8.2 CS-Z50UB4EAW CU-Z50UBEA
CS-Z60UB4EAW CU-Z60UBEA ............... 28
9. Wiring Connection Diagram ............................ 29
9.1 Indoor Unit .................................................. 29
9.2 Outdoor Unit ............................................... 30
10. Electronic Circuit Diagram .............................. 32
10.1 Indoor Unit .................................................. 32
10.2 Outdoor Unit ............................................... 33
11. Printed Circuit Board ....................................... 35
11.1 Indoor Unit .................................................. 35
11.2 Outdoor Unit ............................................... 36
12. Installation Instruction ..................................... 38
12.1 Indoor Unit .................................................. 38
12.2 Outdoor Unit ............................................... 46
13. Installation and Servicing Air Conditioner
using R32 .......................................................... 50
13.1 About R32 Refrigerant ................................ 50
13.2 Characteristics of R32 Refrigerant ............. 50
13.3 Refrigerant piping installation • Tools used
in services ................................................... 52
13.4 New installation, Relocation,
Repairing of Refrigerant Cycle System
The Procedures .......................................... 56
13.5 Piping installation of R32 ............................ 57
13.6 Installation, Relocation, and Service .......... 58
13.7 Repairing of refrigerant cycle /
Brazing point ............................................... 62
13.8 <Reference> Analysis method for no error
code, no cooling / no warming .................... 68
14. Operation Control ............................................. 70
14.1 Basic Function ............................................ 70
14.2 Indoor Fan Motor Operation ....................... 71
14.3 Outdoor Fan Motor Operation .................... 72
14.4 Airflow Direction ..........................................73
14.5 Quiet Operation (Cooling Mode/Cooling
Area of Dry Mode) ......................................73
14.6 Quiet Operation (Heating) ..........................74
14.7 Powerful Mode Operation ...........................74
14.8 Timer Control ..............................................74
14.9 Auto Restart Control ...................................75
14.10 Indication Panel ..........................................75
14.11 Drain Pump Control Operation ...................75
14.12 HA Terminal (HAJEM-A) ............................75
15. Operation Control
(For Multi Split Connection) ............................77
15.1 Cooling operation .......................................77
15.2 Soft Dry Operation ......................................77
15.3 Heating Operation ......................................77
15.4 Automatic Operation ...................................78
15.5 Indoor Fan Motor Operation .......................78
15.6 Powerful Mode Operation ...........................78
15.7 Auto Restart Control ...................................78
15.8 Indication Panel ..........................................78
16. Protection Control ............................................79
16.1 Protection Control for All Operations ..........79
16.2 Protection Control for Cooling & Soft Dry
Operation ....................................................81
16.3 Protection Control for Heating
Operation ....................................................82
17. Servicing Mode .................................................84
17.1 Auto OFF/ON Button ..................................84
17.2 Heat Only Operation ...................................85
17.3 Remote Control Button ...............................86
18. Troubleshooting Guide ....................................90
18.1 Refrigeration Cycle System ........................90
18.2 Breakdown Self Diagnosis Function ...........92
18.3 Error Codes Table ......................................93
18.4 Self-diagnosis Method ................................95
19. Disassembly and Assembly Instructions ... 123
19.1 Disassembly of Parts ............................... 123
19.2 Outdoor Electronic Controller Removal
Procedure ................................................ 126
20. Technical Data ............................................... 129
20.1 Cool Mode Performance Data ................. 129
20.2 Heat Mode Performance Data ................. 131
21. Service Data ................................................... 132
21.1 Cool Mode Outdoor Air Temperature
Characteristic ........................................... 132
21.2 Heat Mode Outdoor Air Temperature
Characteristic ........................................... 136
21.3 Piping Length Correction Factor .............. 140
22. Exploded View and Replacement Parts
List .................................................................. 142
22.1 Indoor Unit ............................................... 142
22.2 CZ-BT20EW (Front Grille Complete) ...... 148
22.3 Outdoor Unit ............................................ 150
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