2
13.4
Electronic Parts Temperature Rise
Protection 2 (Cool)......................................23
13.5 Cooling overload control (Cool)..................24
13.6 Heating overload control (Heat) .................24
13.7 Extreme Low Temperature Compressor low
pressure protection control (Heat)..............24
13.8 Deice Control..............................................25
13.9 Time Delay Safety Control
(Restart Control).........................................25
13.10 30 seconds Force Operation ......................25
13.11 Total Current Control..................................25
13.12 IPM (power transistor) Protection
Control ........................................................25
13.13 Compressor Protection Control
(Gas leak detection control 1) ....................26
13.14 Compressor Protection Control
(Gas leak detection control 2) ....................26
13.15 Valve close detection control......................26
13.16 Compressor discharge high pressure
protection control........................................26
14. Servicing Mode.................................................27
14.1 CU-2E18NBU .............................................27
15. Troubleshooting Guide....................................29
15.1 Self Diagnosis Function..............................29
16. Disassembly and Assembly Instructions ......32
16.1 Outdoor Unit Removal Procedure ..............32
17. Technical Data ..................................................35
17.1 Operation Characteristics...........................35
18. Exploded View and Replacement Parts
List .....................................................................55
