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TABLE OF CONTENTS
PAGE PAGE
1. Safety Precautions ............................................. 3
2. Specifications ..................................................... 5
2.1 CU-2E18SBU-5 ............................................ 5
3. Dimensions ....................................................... 10
4. Refrigeration Cycle Diagram ........................... 11
5. Block Diagram .................................................. 12
6. Wiring Connection Diagram ............................ 13
7. Electronic Circuit Diagram .............................. 14
8. Printed Circuit Board ....................................... 15
8.1 Main Printed Circuit Board ......................... 15
8.2 Noise Filter Printed Circuit Board ............... 16
8.3 Display Printed Circuit Board ..................... 16
9. Installation Information .................................... 17
9.1 Check Points .............................................. 17
10. Installation Instruction ..................................... 18
10.1 Accessories Supplied with Outdoor
Unit ............................................................. 18
10.2 Cutting and Flaring the Piping .................... 18
10.3 Select the Best Location ............................. 19
10.4 Install the Outdoor Unit ............................... 20
10.5 Connect the Piping ..................................... 20
10.6 Evacuation of the Equipment ..................... 21
10.7 Connect the Cable to the Outdoor Unit ...... 22
10.8 Heat Insulation ............................................ 22
11. Operation Control ............................................. 23
11.1 Cooling Operation ....................................... 23
11.2 Heating Operation ...................................... 24
12. Simultaneous Operation Control .................... 25
13. Protection Control ............................................ 26
13.1 Freeze Prevention Control (Cool) ............... 26
13.2 Dew Prevention Control (Cool) ................... 26
13.3 Electronic Parts Temperature Rise
Protection 1 (Cool) ...................................... 26
13.4 Electronic Parts Temperature Rise
Protection 2 (Cool) ...................................... 26
13.5 Cooling Overload Control (Cool) ................ 27
13.6 Heating Overload Control (Heat) ................ 27
13.7 Extreme Low Temperature Compressor
Low Pressure Protection Control (Heat) ..... 28
13.8 Deice Control .............................................. 28
13.9 Time Delay Safety Control (Restart
Control) ....................................................... 28
13.10 30 seconds Force Operation ...................... 28
13.11 Total Current Control .................................. 28
13.12 IPM (power transistor) Protection
Control ........................................................ 29
13.13 Compressor Protection Control (Gas leak
detection control 1) ..................................... 29
13.14 Compressor Protection Control (Gas leak
detection control 2) ..................................... 29
13.15 Valve Close Detection Control ................... 29
13.16 Compressor Discharge High Pressure
Protection Control .......................................30
14. Servicing Mode .................................................31
14.1 CU-2E18SBU-5 ..........................................31
15. Troubleshooting Guide ....................................33
15.1 Self Diagnosis Function ..............................33
16. Disassembly and Assembly Instructions ......36
16.1 Outdoor Unit Removal Procedure ..............36
17. Technical Data ..................................................39
17.1 Cool Mode Performance Data ....................39
17.2 Heat Mode Performance Data ....................41
18. Service Data ......................................................43
18.1 Operation Characteristics ...........................43
19. Exploded View and Replacement Parts
List .....................................................................47
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