Panasonic CU-2E15LBE Service Manual page 2

4.1. CU-2E15LBE CU-2E18LBE -------------------------- 18
4.2. CU-3E18LBE ---------------------------------------------- 19
4.3. CU-4E23LBE ---------------------------------------------- 20
5 Block Diagram --------------------------------------------------- 21
5.1. CU-2E15LBE CU-2E18LBE -------------------------- 21
5.2. CU-3E18LBE ---------------------------------------------- 22
5.3. CU-4E23LBE ---------------------------------------------- 23
6 Wiring Connection Diagram -------------------------------- 24
6.1. CU-2E15LBE CU-2E18LBE -------------------------- 24
6.2. CU-3E18LBE ---------------------------------------------- 25
6.3. CU-4E23LBE ---------------------------------------------- 26
7 Electronic Circuit Diagram----------------------------------- 27
7.1. CU-2E15LBE CU-2E18LBE -------------------------- 27
7.2. CU-3E18LBE ---------------------------------------------- 28
7.3. CU-4E23LBE ---------------------------------------------- 29
8 Printed Circuit Board ------------------------------------------ 30
8.1. Main Printed Circuit Board ----------------------------- 30
8.2. Noise Filter Printed Circuit Board -------------------- 32
8.3. Display Printed Circuit Board ------------------------- 32
9 Installation Information --------------------------------------- 33
9.1. CU-2E15LBE ---------------------------------------------- 33
9.2. CU-2E18LBE ---------------------------------------------- 34
9.3. CU-3E18LBE ---------------------------------------------- 35
9.4. CU-4E23LBE ---------------------------------------------- 36
10 Installation Instruction ---------------------------------------- 37
10.1. CU-2E15LBE CU-2E18LBE -------------------------- 37
10.2. CU-3E18LBE CU-4E23LBE -------------------------- 40
11 Operation Control
2E18LBE) ---------------------------------------------------------- 45
11.1. Compressor Operation Frequency ------------------ 45
11.2. Deice Operation ------------------------------------------ 45
12 Operation Control
4E23LBE) ---------------------------------------------------------- 46
12.1. Cooling Operation---------------------------------------- 46
12.2. Heating Operation---------------------------------------- 47
13 Simultaneous Operation Control -------------------------- 48
14 Protection Control
2E18LBE) ---------------------------------------------------------- 49
14.1. Time delay safety control------------------------------- 49
14.2. Total running current control--------------------------- 49
14.3. IPM (Power transistor) prevention control --------- 49
14.4. Compressor Overheating Prevention Control----- 49
14.5. Low Pressure
Leakage Detection) -------------------------------------- 50
14.6. 4-Way Valve Failure Protection Control ------------ 50
14.7. Protection Control for Cooling & Soft Dry
Operation--------------------------------------------------- 50
14.8. Protection Control for Heating Operation ---------- 51
15 Protection Control
4E23LBE) ---------------------------------------------------------- 52
15.1. Freeze Prevention control (Cool) -------------------- 52
15.2. Dew Prevention control (Cool) ------------------------ 52
15.3. Electronic Parts Temperature Rise Protection
1 (Cool) ----------------------------------------------------- 52
15.4. Electronic Parts Temperature Rise Protection
2 (Cool) ----------------------------------------------------- 52
15.5. Cooling overload control (Cool) ---------------------- 53
15.6. Heating overload control (Heat) ---------------------- 53
15.7. Extreme Low Temperature Compressor low
pressure protection control (Heat) ------------------- 53
15.8. Deice Control---------------------------------------------- 54
(CU-2E15LBE and CU-
(CU-3E18LBE and CU-
(CU-2E15LBE and CU-
Prevention Control (Gas
(CU-3E18LBE and CU-
15.9. Time Delay Safety Control (Restart Control) ----- 54
15.10. 30 seconds Force Operation ------------------------- 54
15.11. Total Current Control------------------------------------ 54
15.12. IPM (power transistor) Protection Control --------- 54
15.13. Compressor Protection Control (Gas leak
detection control 1) -------------------------------------- 54
15.14. Compressor Protection Control (Gas leak
detection control 2) -------------------------------------- 55
15.15. Valve close detection control ------------------------- 55
15.16. Compressor
protection control ---------------------------------------- 55
16 Servicing Mode-------------------------------------------------- 56
16.1. CU-3E18LBE & CU-4E23LBE------------------------ 56
17 Troubleshooting Guide --------------------------------------- 58
17.1. Self Diagnosis Function (CU-3E18LBE and
CU-4E23LBE) -------------------------------------------- 58
17.2. Self Diagnosis Function (CU-2E15LBE and
CU-2E18LBE) -------------------------------------------- 60
18 Disassembly and Assembly Instructions -------------- 63
18.1. Outdoor Unit
2E15LBE CU-2E18LBE) ------------------------------ 63
18.2. Outdoor Unit
3E18LBE CU-4E23LBE) ------------------------------ 64
19 Technical Data --------------------------------------------------- 67
19.1. Operation Characteristics (CU-2E15LBE)--------- 67
19.2. Operation Characteristics (CU-2E18LBE)--------- 71
19.3. Operation Characteristics (CU-3E18LBE)--------- 75
19.4. Operation Characteristics (CU-4E23LBE)--------- 87
20 Exploded View and Replacement Parts List----------- 99
20.1. CU-2E15LBE CU-2E18LBE-------------------------- 99
20.2. CU-3E18LBE CU-4E23LBE------------------------- 101
2
discharge high pressure
Removal Procedure (CU-
Removal Procedure (CU-