DOWNLOAD Panasonic CS-MZ20UD3EA Service Manual ↓ Size: 14.93 MB | Pages: 103 in PDF or view online for FREE

 

 

 
 

Please file and use this manual together with the service manual for Model No. CU-2E12SBE, CU-2E15SBE, CU-2E18SBE, 
CU-3E23SBE, CU-3E18PBE, CU-4E23PBE, CU-4E27PBE, CU-5E34PBE, CU-2Z35TBE, CU-2Z41TBE, CU-2Z50TBE, 
CU-3Z52TBE, CU-3Z68TBE, CU-4Z68TBE, CU-4Z80TBE, CU-5Z90TBE, Order No. PAPAMY1601015CE, PAPAMY1301048CE, 
PAPAMY1303046CE, PAPAMY1702035CE, PAPAMY1703049CE, PAPAMY1710082CE. 

 

 

 

 

 

 

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

 

 

 

 – This Air Conditioner contains and operates with refrigerant R32. 

THIS PRODUCT MUST ONLY BE INSTED OR SERVICED BY QUALIFIED PERSONNEL. 
Refer to Commonwealth, State, Territory and local legislation, regulations, codes, instation & operation manuals, before the 
instation, maintenance and/or service of this product.

 

There are special components used in this equipment which are important for safety. These parts are marked by       in the Schematic
Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that these critical parts should be replaced
with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of
manufacturer.

  Specifications, designs and contents in this Service Manual are subject to change without notice. 

 
 

2 

PAGE    

PAGE

 

 

 

 

 

 

 

 

 

 

5.1

 

Indoor Unit .................................................. 17

 

5.2

 

Remote Control .......................................... 17

 

 

 

6.1

 

Indoor Unit .................................................. 18

 

 

 

 

 

 

 

9.1

 

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

 

 

 

10.1

 

Indoor Unit .................................................. 22

 

 

 

11.1

 

Indoor Unit .................................................. 23

 

 

 

12.1

 

Indoor Unit .................................................. 25

 

 

 

13.1

 

About R32 Refrigerant ................................ 35

 

13.2

 

Characteristics of R32 Refrigerant ............. 35

 

13.3

 

Refrigerant piping installation • Tools used  
in services ................................................... 37

 

13.4

 

New installation, Relocation,  
Repairing of Refrigerant Cycle System  
The Procedures .......................................... 41

 

13.5

 

Piping installation of R32 ............................ 42

 

13.6

 

Installation, Relocation, and Service .......... 43

 

13.7

 

Repairing of refrigerant cycle /  
Brazing point ............................................... 47

 

13.8

 

<Reference> Analysis method for no error 
code, no cooling / no warming .................... 53

 

 

 

14.1

 

Basic Function ............................................ 55

 

14.2

 

Quiet Operation (Cooling Mode/Cooling  
area of Soft Dry Mode) ............................... 58

 

14.3

 

Powerful Mode Operation ........................... 59

 

14.4

 

Timer Control .............................................. 59

 

14.5

 

Auto Restart Control ................................... 59

 

14.6

 

Indication Panel .......................................... 59

 

14.7

 

HA Terminal (HAJEM-A) ............................ 60

 

 

 

15.1

 

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

 

15.2

 

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

 

15.3

 

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

 

15.4

 

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

 

15.5

 

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

 

15.6

 

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

 

15.7

 

Auto Restart Control ...................................63

 

15.8

 

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

 

 

 

16.1

 

Refrigeration Cycle System ........................64

 

16.2

 

Breakdown Self Diagnosis Function ...........66

 

16.3

 

Error Codes Table ......................................67

 

16.4

 

Self-diagnosis Method ................................69

 

 

 

17.1

 

Indoor Electronic Controller, Blower Fan, 
Fan Motor & Drain Motor Removal 
Procedure. ..................................................97

 

 

 

18.1

 

CS-MZ20UD3EA ..................................... 100

 

 

 

19.1

 

Indoor Unit ...............................................  101

 

3 

  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. 

 

WARNING 

This indication shows the possibility of causing death or serious injury. 

CAUTION 

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

 

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

 

 

  Explanation of symbols displayed on the indoor unit or outdoor unit. 

 

             WARNING 

This symbol shows that this equipment uses a flammable refrigerant. 
If the refrigerant is leaked, together with an external ignition source, there is a possibility of ignition. 

             CAUTION 

This symbol shows that the Operation Manual should be read carefully. 

             CAUTION 

This symbol shows that a service personnel should be handling this equipment with reference to the  
Installation Manual. 

             CAUTION 

This symbol shows that there is information included in the Operation Manual and/or Installation Manual. 

 

  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. 

 

WARNING 

1. 

Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. Any 
unfit method or using incompatible material may cause product damage, burst and serious injury. 

 

2. 

Do not install outdoor unit near handrail of veranda. When installing air-conditioner unit on veranda of a high rise building, child 
may climb up to outdoor unit and cross over the handrail causing an accident. 

 

3. 

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. 

 

4. 

The appliance shall be stored in a well ventilated room with floor area larger than A min (m

2

 ) [refer Table A] and without any 

continuously operating ignition sources. 
Keep away from open flames, any operating gas appliances or any operating electric heater. Else, it may explode and cause 
injury or death. 

 

5. 

Do not tie up the power supply cord into a bundle by band. Abnormal temperature rise on power supply cord may happen. 

 

6. 

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

 

7. 

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

 

8. 

The appliance shall be installed, and/or operated in a room with floor area larger than A min (m

2

 ) [refer Table A] and keep away 

from ignition sources, such as heat/sparks/open flame, or, hazardous areas, such as gas appliances, gas cooking, reticulated 
gas supply systems, or electric cooking appliances, etc. 

 

9. 

Keep plastic bag (packaging material) away from small children, it may cling to nose and mouth and prevent breathing. 

 

10. 

When installing or relocating 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. 

 

11. 

Do not pierce or burn as the appliance is pressurized. Do not expose the appliance to heat, flame, sparks, or other sources of 
ignition. 
Else, it may explode and cause injury or death. 

 

12.  Do not add or replace refrigerant other than specified type. It may cause product damage, burst and injury etc. 

 

 

This symbol denotes item that is PROHIBITTED from doing. 

4 

WARNING 

13. 

Do not perform flare connection inside a building or dwelling or room, when joining the heat exchanger of indoor unit with 
interconnecting piping. Refrigerant connection inside a building or dwelling or room must be made by brazing or welding. Joint 
connection of indoor unit by flaring method can only be made at outdoor or at outside of a building or dwelling or room. Flare 
connection may cause gas leak and flammable atmosphere. 

 

14. 

 

For R32 model, use piping, flare nut and tools which is specified for R32 refrigerant. Using of existing (R22) piping, flare nut and 
tools may cause abnormally high pressure in the refrigerant cycle (piping), and possibly result in explosion and injury. 

 

Thickness or copper pipes used with R32 must be more than 0.8 mm. Never use copper pipes thinner than 0.8 mm. 

 

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

15. 

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. 

16. 

For refrigeration system work, Install according to this installation instructions strictly. If installation is defective, it will cause water 
leakage, electrical shock or fire. 

17. 

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. 

18. 

Install at a strong and firm location which is able to withstand weight of the set. If the strength is not enough or installation is not properly 
done, the set will drop and cause injury. 

19. 

For electrical work, follow the national regulation, legistration and this installation instructions. An independent circuit and single outlet 
must be used. If electrical circuit capacity is not enough or defect found in the electrical work, it will cause electrical shock or fire. 

20. 

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

21. 

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 connection point of terminal, fire or electrical shock. 

22. 

This equipment is strongly recommended to be installed with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD), 
with sensitivity of 30mA at 0.1 sec or less. Otherwise, it may cause electrical shock and fire in case of equipment breakdown or 
insulation breakdown. 

23. 

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

24. 

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

25. 

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. 

26. 

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

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

28.  Be aware that refrigerants may not contain an odour. 

29. 

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 electrical shock in case of equipment breakdown or insulation breakdown. 

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

31.  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. 

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

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

 
 

CAUTION 

1. 

Do not install the unit in a place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding 
of the unit, it may cause fire. 

 

2. 

Prevent liquid or vapor from entering sumps or sewers since vapor is heavier than air and may form suffocating atmospheres. 

 

3. 

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. 

 

4. 

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