CS-E7NKDW, CS-E9NKDW, CS-E12NKDW, CS-E15NKDW, CS-E18NKDW, CU-E7NKD, CU-E9NKD, CU-E12NKD, CU-E15NKD, CU-E18NKD - Panasonic Air Conditioner Service Manual (repair manual)

 

 

 
 

 

 

Please file and use this manual together with the service manual for Model No. U-2E18CBPG, Order No. RAC0209005C2, Model No. 
U-3E18JBE, U-4E23JBE, Order No. PHAAM1004141C2 and Model No. U-2E15GBE, Order No. MAC0704001A2. 

 

 

 

 

 

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

 

 
 

This service information is designed for experienced repair technicians only and is not designed for use by the general public. 
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. 
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service 
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death. 

2 

 

 

 

 

 

 

 

 

4.1

 

Indoor Unit ..................................................20

 

4.2

 

Outdoor Unit ...............................................20

 

4.3

 

Remote Control ..........................................20

 

 

 

5.1

 

Indoor Unit ..................................................21

 

5.2

 

Outdoor Unit ...............................................23

 

 

 

6.1

 

CU-E7NKD  CU-E9NKD  CU-E12NKD 
CU-E15NKD ...............................................24

 

6.2

 

CU-E18NKD ...............................................25

 

 

 

7.1

 

CU-E7NKD  CU-E9NKD  CU-E12NKD 
CU-E15NKD ...............................................26

 

7.2

 

CU-E18NKD ...............................................27

 

 

 

8.1

 

Indoor Unit ..................................................28

 

8.2

 

Outdoor Unit ...............................................30

 

 

 

9.1

 

Indoor Unit ..................................................32

 

9.2

 

Outdoor Unit ...............................................34

 

 

 

10.1

 

Indoor Unit ..................................................36

 

10.2

 

Outdoor Unit ...............................................39

 

 

 

11.1

 

Select the Best Location.............................41

 

11.2

 

Indoor Unit ..................................................42

 

11.3

 

Outdoor Unit ...............................................46

 

 

 

12.1

 

Basic Function ............................................49

 

12.2

 

Indoor Fan Motor Operation .......................50

 

12.3

 

Outdoor Fan Motor Operation ....................51

 

12.4

 

Airflow Direction..........................................51

 

12.5

 

Quiet operation (Cooling Mode/Cooling area 
of Dry Mode)...............................................52

 

12.6

 

Quiet operation (Heating) ...........................53

 

12.7

 

Powerful Mode Operation...........................53

 

12.8

 

Timer Control..............................................53

 

12.9

 

Auto Restart Control...................................54

 

12.10

 

Indication Panel ..........................................54

 

12.11

 

nanoe-G Operation.....................................55

 

12.12

 

Mild Dry Cooling Operation ........................57

 

12.13

 

ECONAVI and AUTO COMFORT 
Operation....................................................58

 

 

 

13.1

 

Cooling operation .......................................62

 

13.2

 

Soft Dry Operation..................................... 62

 

13.3

 

Heating Operation ..................................... 62

 

13.4

 

Automatic Operation.................................. 63

 

13.5

 

Indoor Fan Motor Operation ...................... 63

 

13.6

 

Powerful Mode Operation.......................... 63

 

13.7

 

Auto restart control .................................... 63

 

13.8

 

Indication Panel ......................................... 63

 

13.9

 

Mild Dry Cooling Operation ....................... 63

 

 

 

14.1

 

Protection Control For All Operations........ 64

 

14.2

 

Protection Control For Cooling & Soft Dry 
Operation................................................... 66

 

14.3

 

Protection Control For Heating 
Operation................................................... 67

 

 

 

15.1

 

Auto OFF/ON Button ................................. 68

 

15.2

 

Remote Control Button.............................. 69

 

 

 

16.1

 

Refrigeration Cycle System....................... 70

 

16.2

 

Breakdown Self Diagnosis Function.......... 72

 

16.3

 

Error Code Table ....................................... 73

 

16.4

 

Self-diagnosis Method............................... 75

 

 

 

17.1

 

CS-E7NK  CS-E9NK  CS-E12NK 
CS-E15NK ............................................... 104

 

17.2

 

CS-E18NK ............................................... 108

 

17.3

 

Outdoor Electronic Controller Removal 
Procedure ................................................ 112

 

 

 

18.1

 

Operation Characteristics........................ 114

 

18.2

 

Sensible Capacity Chart.......................... 134

 

 

 

19.1

 

Indoor Unit ............................................... 136

 

19.2

 

Outdoor Unit ............................................ 142

 

 

3 

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

š  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. 

š  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. 

 

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

 

 

š  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 authorized dealer or specialist for installation and servicing. If installation or 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 connection 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. For R410A models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may cause 
      abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only R410A materials. 
      Thickness of copper pipes used with R410A must be more than 0.8mm. Never use copper pipes thinner than 0.8mm. 
      It is desirable that the amount of residual oil is less than 40 mg/10m. 

 

This symbol denotes item that is PROHIBITED from doing. 

4 

 

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). 
20. During pump down operation, stop the compressor before remove the refrigeration 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 the 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. 

25. Using of refrigerant other than the specified type may cause product damage, burst and injury etc. 

 
 

 

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 (3/4~1.75HP), 16A (2.0HP), 20A (2.5HP) or  
         25A (3.0HP) 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 (3/4~2.0HP), 20A (2.5HP) or  
         25A (3.0HP) 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 fins or edges of metal parts. 
      If you are required to handle sharp parts during installation or servicing, please wear hand glove. 
      Sharp parts may cause injury.