DOWNLOAD Panasonic CU-3E18JBE / CU-4E23JBE Service Manual ↓ Size: 7.68 MB | Pages: 75 in PDF or view online for FREE

Order No. PHAAM0901088C2

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1 Safety Precautions----------------------------------------------- 3
2 Specifications ----------------------------------------------------- 5

2.1. CU-3E18JBE ----------------------------------------------- 5
2.2. CU-4E23JBE ----------------------------------------------- 9

3 Dimensions--------------------------------------------------------15
4 Refrigeration Cycle Diagram --------------------------------16

4.1. CU-3E18JBE ----------------------------------------------16
4.2. CU-4E23JBE ----------------------------------------------17

5 Block Diagram ----------------------------------------------------18

5.1. CU-3E18JBE ----------------------------------------------18
5.2. CU-4E23JBE ----------------------------------------------19

6 Wiring Connection Diagram  --------------------------------20

6.1. CU-3E18JBE ---------------------------------------------- 20
6.2. CU-4E23JBE ---------------------------------------------- 21

7 Electronic Circuit Diagram----------------------------------- 22

7.1. CU-3E18JBE ---------------------------------------------- 22
7.2. CU-4E23JBE ---------------------------------------------- 23

8 Printed Circuit Board ------------------------------------------ 24

8.1. Main Printed Circuit Board----------------------------- 24
8.2. Noise Filter Printed Circuit Board -------------------- 25
8.3. Display Printed Circuit Board ------------------------- 25

9 Installation Information --------------------------------------- 26

9.1. CU-3E18JBE ---------------------------------------------- 26
9.2. CU-4E23JBE ---------------------------------------------- 27

Please file and use this manual together with the service manual for Model No. CS-E7JKEW  CS-E7JKEW-3  CS-XE7JKEW  CS-
ME7EB1E  CS-E7JKDW  CS-E9JKEW  CS-E9JKEW-3  CS-CE9JKEW  CS-XE9JKEW  CS-ME10EB1E  CS-E10JD3EA  CS-
ME10DTEG  CS-E10HB4EA  CS-E9GFEW  CS-E9GFEW-2  CS-E9JKDW  CS-XE9JKDW  CS-E12JKEW  CS-E12JKEW-3  CS-
CE12JKEW  CS-XE12JKEW  CS-ME12EB1E  CS-E12GFEW  CS-E12GFEW-2  CS-E12JKDW  CS-XE12JKDW  CS-E15JKEW
CS-XE15JKEW  CS-ME14EB1E  CS-E15JD3EA  CS-E15DTEW  CS-E15HB4EA  CS-E15JKDW  CS-E18JKEW  CS-XE18JKEW
CS-E18JD3EA  CS-E18DTEW  CS-E18HB4EA  CS-E18GFEW  CS-E18GFEW-2  CS-E18JKDW  CS-XE18JKDW  CS-E21JKEW
CS-XE21JKEW  CS-E21JD3EA  CS-E21JB4EA  CS-E21JKDW, Order No. PHAAM0810051C2  MAC0803024C8
MAC0502042C8  PHAAM0810060C2  PHAAM0901079C8  RAC0602010C2  RAC0704001C2  PHAAM0810054C2
MAC0804027A2  PHAAM0810061C2  PHAAM0905053C2  PHAAM0901093C8  RAC0503011C2.

2

10 Installation Instruction ---------------------------------------- 28

10.1. Select The Best Location ------------------------------ 28
10.2. Install The Outdoor Unit -------------------------------- 29
10.3. Connect The Piping-------------------------------------- 29
10.4. Evacuation Of The Equipment ------------------------ 30
10.5. Connect The Cable To The Outdoor Unit ---------- 31
10.6. Heat Insulation -------------------------------------------- 32

11 Operation Control----------------------------------------------- 33

11.1. Cooling Operation---------------------------------------- 33
11.2. Heating Operation---------------------------------------- 34

12 Simultaneous Operation Control -------------------------- 35
13 Protection Control ---------------------------------------------- 36

13.1. Freeze Prevention control (Cool) -------------------- 36
13.2. Dew Prevention control (Cool) ------------------------ 36
13.3. Electronic Parts Temperature Rise Protection

1 (Cool) ----------------------------------------------------- 36

13.4. Electronic Parts Temperature Rise Protection

2 (Cool) ----------------------------------------------------- 36

13.5. Cooling overload control (Cool) ---------------------- 37
13.6. Heating overload control (Heat) ---------------------- 37
13.7. Extreme Low Temperature Compressor low

pressure protection control (Heat) ------------------- 37

13.8. Deice Control---------------------------------------------- 38
13.9. Time Delay Safety Control (Restart Control) ------ 38

13.10. 30 seconds Force Operation -------------------------- 38

13.11. Total Current Control ------------------------------------ 38

13.12. IPM (power transistor) Protection Control --------- 38
13.13. Compressor Protection Control (Gas leak

detection control 1) -------------------------------------- 38

13.14. Compressor Protection Control (Gas leak

detection control 2) -------------------------------------- 39

13.15. Valve close detection control -------------------------- 39
13.16. Compressor discharge high pressure

protection control ----------------------------------------- 39

14 Servicing Mode -------------------------------------------------- 40

14.1. CU-3E18JBE & CU-4E23JBE ------------------------ 40

15 Troubleshooting Guide---------------------------------------- 42

15.1. Self Diagnosis Function -------------------------------- 42

16 Disassembly and Assembly Instructions --------------- 45

16.1. Outdoor Unit Removal Procedure-------------------- 45

17 Technical Data---------------------------------------------------- 48

17.1. Operation Characteristics (CU-3E18JBE) --------- 48
17.2. Operation Characteristics (CU-4E23JBE) --------- 60

18 Exploded View and Replacement Parts List ----------- 72

18.1. CU-3E18JBE ---------------------------------------------- 72
18.2. CU-4E23JBE ---------------------------------------------- 73

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•

Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing. 

•  Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the

power plug and main circuit for the model installed. 

•  The caution items stated here must be followed because these important contents are related to safety. The

meaning of each indication used is as below. Incorrect installation or servicing due to ignoring of the instruction
will cause harm or damage, and the seriousness is classified by the following indications. 

This indication shows the possibility of causing death or serious injury 

This indication shows the possibility of causing injury or damage to properties. 

•  The items to be followed are classified by the symbols: 

•

Carry out test run to confirm that no abnormality occurs after the servicing. Then, explain to user the operation, 
care and maintenance as stated in instructions. Please remind the customer to keep the operating instructions for 
future reference. 

1.   Do not modify the machine, part, material during repairing service. 

2.  If wiring unit is supplied as repairing part, do not repair or connect the wire even only partial wire break. Exchange the whole wiring unit. 

3.   Do not wrench the fasten terminal. Pull it out or insert it straightly. 

4.   Engage dealer or specialist for installation and servicing. If installation of servicing done by the user is defective, it will cause water leakage, 

electrical shock or fire. 

5.   Install according to this installation instructions strictly. If installation is defective, it will cause water leakage, electric shock or fire. 

6.   Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage, fire 

or electrical shock. 

7.   Install at a strong and firm location which is able to withstand the set’s weight. If the strength is not enough or installation is not properly done,

  the set will drop and cause injury. 

8.   For electrical work, follow the local national wiring standard, regulation and the installation instruction. An independent circuit and single outlet

  must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire. 

9.   This equipment is strongly recommended to install with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD). Otherwise, it 

  may cause electrical shock and fire in case equipment breakdown or insulation breakdown. 

10. Do not use joint cable for indoor / outdoor connection cable. Use the specified indoor / outdoor connection cable, refer to installation instruction
      CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor / outdoor connection. Clamp the cable so that no external force
      will be acted on the terminal. If connecting or fixing is not perfect, it will cause heat up or fire at the connection.

11. Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will cause 

  heat-up or fire at the connection point of terminal, fire or electrical shock. 

12. When install or relocate air conditioner, do not let any substance other than the specified refrigerant, eg. air etc. mix into refrigeration cycle (piping). 
      (Mixing of air etc. will cause abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).

13. Do not install outdoor unit near handrail of veranda. When installing air-conditioner unit at veranda of high rise building, child may  

  climb up to outdoor unit and cross over the handrail and causing accident.

14. This equipment must be properly earthed. Earth line must not be connected to gas pipe, water pipe, earth of lightning rod and  

  telephone. Otherwise, it may cause electric shock in case equipment breakdown or insulation breakdown. 

15. Keep away from small children, the thin film may cling to nose and mouth and prevent breathing. 

16. Do not use unspecified cord, modified cord, joint cord or extension cord for power supply cord. Do not share the single outlet with
      other electrical appliances. Poor contact, poor insulation or over current will cause electrical shock or fire.

17. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break
      and cause refrigerant gas leakage.

18. In case of using existing (R22) pipes during installation of R410 models, must carry out pump down properly to collect back the  

  refrigerant and oil before installation new unit.
  Thickness of copper pipes used with R410A must be more than 0.6mm. Never use copper pipes thinner than 0.6mm. 

 It is desirable that the amount of residual oil is less than 40 mg/10m. 

19. During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration piping
      and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.)

This symbol denotes item that is PROHIBITED from doing. 

4 

20. During pump down operation, stop the compressor before remove the refrigerant piping. (Removal of refrigeration piping while compressor is
      operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).

21. After completion of installation or service, confirm there is no leakage or refrigerant gas. It may generate toxic gas when the refrigerant  

  contacts with fire. 

22. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when refrigerant contacts with fire. 

23. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury. 

24. Must not use other parts except original parts describe in catalog and manual. 

1.   Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the  

  unit, it may cause fire. 

2.   Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage  

  the furniture. 

3.   Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare  

  may break and cause refrigerant gas leakage. 

4.   Do not touch outdoor unit air inlet and aluminium fin. It may cause injury. 

5.   Select an installation location which is easy for maintenance. 

6.   Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher. Please use 

a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).

  Pb free solder will tend to splash when heated too high (about 1100°F / 600°C). 

7.   Power supply connection to the air conditioner. Connect the power supply cord of the air conditioner to the mains using one of the following

  methods. 
  Power supply point shall be the place where there is ease for access for the power disconnection in case of emergency. In some countries, 
  permanent connection of this room air conditioner to the power supply is prohibited. 
  i.  Power supply connection to the receptacle using a power plug.  

  Use an approved 15/16A (1.0 ~ 1.75HP) or 16A (2.0HP) or 20A (2.5HP) power plug with earth pin for the connection to the socket. 

  ii. Power supply connection to a circuit breaker for the permanent connection. 

  Use an approved 16A (1.0 ~ 2.0HP) or 20A (2.5HP) circuit breaker for the permanent connection. It must be a double pole switch with a  
  minimum 3.0 mm contact gap. 

8.   Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts. Take  

  care of the liquid refrigerant, it may cause frostbite. 

9.  Installation or servicing work: It may need two people to carry out the installation or servicing work. 

10. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc. 

11. Do not sit or step on the unit, you may fall down accidentally. 

12. Do not touch the sharp aluminium fin, sharp parts may cause injury.