2
TABLE OF CONTENTS
PAGE
PAGE
1. Safety Precautions ............................................. 3
2. Precaution for Using R32 Refrigerant .............. 5
3. Specifications ..................................................... 9
3.1 CU-2TZ41TBE .............................................. 9
3.2 CU-2TZ50TBE ............................................ 11
4. Dimensions ....................................................... 16
5. Refrigeration Cycle Diagram ........................... 17
6. Block Diagram .................................................. 18
7. Wiring Connection Diagram ............................ 19
8. Electronic Circuit Diagram .............................. 20
9. Printed Circuit Board ....................................... 21
9.1 Main Printed Circuit Board ......................... 21
9.2 Noise Filter Printed Circuit Board ............... 22
10. Installation Information .................................... 23
10.1 CU-2TZ41TBE ............................................ 23
10.2 CU-2TZ50TBE ............................................ 24
11. Installation Instruction ..................................... 25
11.1 Outdoor Unit ............................................... 25
12. Operation Control ............................................. 30
12.1 Cooling Operation ....................................... 30
12.2 Heating Operation ...................................... 31
12.3 Outdoor Quiet Cooling Operation Control ......
.................................................................... 31
13. Simultaneous Operation Control .................... 33
14. Protection Control ............................................ 34
14.1 Freeze Prevention control (Cool) ............... 34
14.2 Dew Prevention control (Cool) ................... 34
14.3 Electronic Parts Temperature Rise
Protection 1 (Cool) ...................................... 34
14.4 Electronic Parts Temperature Rise
Protection 2 (Cool) ...................................... 34
14.5 Cooling overload control (Cool) .................. 35
14.6 Heating overload control (Heat) ................. 35
14.7 Extreme Low Temperature Compressor low
pressure protection control (Heat) .............. 35
14.8 Deice Control .............................................. 36
14.9 Time Delay Safety Control (Restart Control) ..
.................................................................... 36
14.10 30 seconds Force Operation ...................... 36
14.11 Total Current Control .................................. 36
14.12 IPM (power transistor) Protection Control ......
..................... Error! Bookmark not defined.
14.13
Compressor Protection Control (Gas leak
detection control 1) .....................................37
14.14 Compressor Protection Control (Gas leak
detection control 2) .....................................37
14.15 Valve close detection control ......................37
14.16 Compressor discharge high pressure
protection control ........................................37
14.17 Compressor discharge high temperature
protection control ........................................38
14.18 Cooling Outdoor Air Temperature Control
(Cool) ..........................................................38
14.19 Heating Outdoor Air Temperature Control
(Heat) ..........................................................38
15. Servicing Mode .................................................39
15.1 Pump down operation.................................39
15.2 Heating only function ..................................39
16. Troubleshooting Guide ....................................40
16.1 Self Diagnosis Function ..............................40
17. Disassembly and Assembly Instructions ......42
17.1 Outdoor Unit Removal Procedure ..............42
18. Technical Data ..................................................44
18.1 Cool Mode Performance Data ....................44
18.2 Heat Mode Performance Data ....................52
19. Service Data ......................................................59
19.1 Operation Characteristics (CU-2TZ41TBE) ...
....................................................................59
19.2 Operation Characteristics (CU-2Z50TBE) ......
....................................................................71
20. Exploded View and Replacement Parts List ......
............................................................................91
Specifications, designs and contents in this Service Manual are subject to change without notice.
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