Panasonic CS-MZ20UD3EA Service Manual ▷ View online
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1. Safety Precautions
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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CAUTION
5.
Do not touch the sharp aluminium fin, sharp parts may cause injury.
6.
Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the
furniture.
furniture.
7.
Select an installation location which is easy for maintenance.
Incorrect installation, service or repair of this air conditioner may increase the risk of rupture and this may result in loss damage or injury
and/or property.
Incorrect installation, service or repair of this air conditioner may increase the risk of rupture and this may result in loss damage or injury
and/or property.
8.
Installation or servicing work: It may need two people to carry out the installation or servicing work.
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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).
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).
10.
Do not touch the sharp aluminum 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.
If you are required to handle sharp parts during installation or servicing, please wear hand glove.
Sharp parts may cause injury.
11.
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.
break and cause refrigerant gas leakage.
12. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.
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2. Precaution for Using R32 Refrigerant
The basic installation work procedures are the same as conventional refrigerant (R410A, R22) models.
However, pay careful attention to the following points:
WARNING
1.
Since the working pressure is higher than that of refrigerant R22 models, some of the piping and installation and service tools are
special.
(See “2.1. Special tools for R32 (R410A)”.)
Especially, when replacing a refrigerant R22 model with a new refrigerant R32 model, always replace the conventional piping and flare
nuts with the R32 and R410A piping and flare nuts on the outdoor unit side.
For R32 and R410A, the same flare nut on the outdoor unit side and pipe can be used.
special.
(See “2.1. Special tools for R32 (R410A)”.)
Especially, when replacing a refrigerant R22 model with a new refrigerant R32 model, always replace the conventional piping and flare
nuts with the R32 and R410A piping and flare nuts on the outdoor unit side.
For R32 and R410A, the same flare nut on the outdoor unit side and pipe can be used.
2.
Models that use refrigerant R32 and R410A have a different charging port thread diameter to prevent erroneous charging with refrigerant
R22 and for safety.
Therefore, check beforehand. [The charging port thread diameter for R32 and R410A is 12.7 mm (1/2 inch).]
R22 and for safety.
Therefore, check beforehand. [The charging port thread diameter for R32 and R410A is 12.7 mm (1/2 inch).]
3.
Be more careful than R22 so that foreign matter (oil, water, etc.) does not enter the piping.
Also, when storing the piping, securely seal the opening by pinching, taping, etc. (Handling of R32 is similar to R410A.)
Also, when storing the piping, securely seal the opening by pinching, taping, etc. (Handling of R32 is similar to R410A.)
CAUTION
1.
Installation (Space)
Must ensure the installation of pipe-work shall be kept to a minimum. Avoid use dented pipe and do not allow acute bending.
Must ensure that pipe-work shall be protected from physical damage.
Must comply with national gas regulations, state municipal rules and legislation. Notify relevant authorities in accordance with all
applicable regulations.
applicable regulations.
Must ensure mechanical connections be accessible for maintenance purposes.
In cases that require mechanical ventilation, ventilation openings shall be kept clear of obstruction.
When disposal of the product, do follow to the precautions in #12 and comply with national regulations.
Always contact to local municipal offices for proper handling.
Interconnecting refrigerant pipework, i.e. pipework external to the unitary components, should be marked with a Class label (see
Figure 9.1 of Code of Practice) every two metres where the pipework is visible. This includes pipework located in a ceiling space or
any void which a person may access for maintenance or repair work within that space.
Figure 9.1 of Code of Practice) every two metres where the pipework is visible. This includes pipework located in a ceiling space or
any void which a person may access for maintenance or repair work within that space.
2.
Servicing
2-1. Service personnel
Any qualified person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from
an industry-accredited assessment authority, which authorizes their competence to handle refrigerants safely in accordance with an
industry recognised assessment specification.
an industry-accredited assessment authority, which authorizes their competence to handle refrigerants safely in accordance with an
industry recognised assessment specification.
Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requiring the
assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable
refrigerants.
assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable
refrigerants.
Servicing shall be performed only as recommended by the manufacturer.
2-2. Work
Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of
ignition is minimised.
ignition is minimised.
For repair to the refrigerating system, the precautions in #2-2 to #2-8 must be followed before conducting work on the system.
Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapor being present while
the work is being performed.
the work is being performed.
All maintenance staff and others working in the local area shall be instructed and supervised on the nature of work being carried
out.
out.
Avoid working in confined spaces.
Wear appropriate protective equipment, including respiratory protection, as conditions warrant.
Ensure that the conditions within the area have been made safe by limit of use of any flammable material. Keep all sources of
ignition and hot metal surfaces away.
ignition and hot metal surfaces away.
2-3. Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of
potentially flammable atmospheres.
potentially flammable atmospheres.
Ensure that the leak detection equipment being used is suitable for use with flammable refrigerants, i.e. non sparking, adequately
sealed or intrinsically safe.
sealed or intrinsically safe.
In case of leakage/spillage happened, immediately ventilate area and stay upwind and away from spill/release.
In case of leakage/spillage happened, do notify persons downwind of the leaking/spill, isolate immediate hazard area and keep
unauthorized personnel out.
unauthorized personnel out.
2-4. Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment
shall be available at hand.
shall be available at hand.
Have a dry powder or CO
2
fire extinguisher adjacent to the charging area.