Panasonic CU-2TZ41TBE User manual

© Panasonic Corporation 2018
Order No: PAPAMY1802045CE
Air Conditioner
Outdoor Unit
CU-2TZ41TBE
CU-2TZ50TBE
Destination
Europe
Turkey
Please file and use this manual together with the service manual for Model No. CS-MTZ16TKE CS-TZ20TKEW CS-TZ25TKEW
CS-TZ35TKEW CS-TZ42TKEW CS-TZ50TKEW CS-TE20TKEW CS-TE25TKEW CS-TE35TKEW CS-TE42TKEW CS-TE50TKEW
CS-TZ20TKEW-1 CS-TZ25TKEW-1 CS-TZ35TKEW-1 CS-TZ42TKEW-1 Order No. PAPAMY1702032CE, PAPAMY1703046CE,
PAPAMY1703052CE, PAPAMY1704061CE, PAPAMY1801024CE, PAPAMY1802072CE
WARNING
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.
IMPORT
A
NT S
A
FET
Y
NOTICE
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.
!
PRECAUTION OF LOW TEMPERATURE
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
CAUTION
R32 REFRIGERANT – This Air Conditioner contains and operates with refrigerant R32.
THIS PRODUCT MUST ONLY BE INSTALLED OR SERVICED BY QUALIFIED PERSONNEL.
Refer to Commonwealth, State, Territory and local legislation, regulations, codes, installation & operation manuals, before the
installation, maintenance and/or service of this product.

2
TABLE OF CONTENTS
PAGE PAGE
1.Safety Precautions ............................................. 3
2.Precaution for Using R32 Refrigerant .............. 5
3.Specifications ..................................................... 9
3.1CU-2TZ41TBE .............................................. 9
3.2CU-2TZ50TBE ............................................ 11
4.Dimensions ....................................................... 16
5.Refrigeration Cycle Diagram ........................... 17
6.Block Diagram .................................................. 18
7.Wiring Connection Diagram ............................ 19
8.Electronic Circuit Diagram .............................. 20
9.Printed Circuit Board ....................................... 21
9.1Main Printed Circuit Board ......................... 21
9.2Noise Filter Printed Circuit Board ............... 22
10.Installation Information .................................... 23
10.1CU-2TZ41TBE ............................................ 23
10.2CU-2TZ50TBE ............................................ 24
11.Installation Instruction ..................................... 25
11.1Outdoor Unit ............................................... 25
12.Operation Control ............................................. 30
12.1Cooling Operation ....................................... 30
12.2Heating Operation ...................................... 31
12.3Outdoor Quiet Cooling Operation Control ......
.................................................................... 31
13.Simultaneous Operation Control .................... 33
14.Protection Control ............................................ 34
14.1Freeze Prevention control (Cool) ............... 34
14.2Dew Prevention control (Cool) ................... 34
14.3Electronic Parts Temperature Rise
Protection 1 (Cool) ...................................... 34
14.4Electronic Parts Temperature Rise
Protection 2 (Cool) ...................................... 34
14.5Cooling overload control (Cool) .................. 35
14.6Heating overload control (Heat) ................. 35
14.7Extreme Low Temperature Compressor low
pressure protection control (Heat) .............. 35
14.8Deice Control .............................................. 36
14.9Time Delay Safety Control (Restart Control) ..
.................................................................... 36
14.1030 seconds Force Operation ...................... 36
14.11Total Current Control .................................. 36
14.12IPM (power transistor) Protection Control ......
..................... Error! Bookmark not defined.
14.13Compressor Protection Control (Gas leak
detection control 1) .....................................37
14.14Compressor Protection Control (Gas leak
detection control 2) .....................................37
14.15Valve close detection control ......................37
14.16Compressor discharge high pressure
protection control ........................................37
14.17Compressor discharge high temperature
protection control ........................................38
14.18Cooling Outdoor Air Temperature Control
(Cool) ..........................................................38
14.19Heating Outdoor Air Temperature Control
(Heat) ..........................................................38
15.Servicing Mode .................................................39
15.1Pump down operation.................................39
15.2Heating only function ..................................39
16.Troubleshooting Guide ....................................40
16.1Self Diagnosis Function ..............................40
17.Disassembly and Assembly Instructions ......42
17.1Outdoor Unit Removal Procedure ..............42
18.Technical Data ..................................................44
18.1Cool Mode Performance Data ....................44
18.2Heat Mode Performance Data ....................52
19.Service Data ......................................................59
19.1Operation Characteristics (CU-2TZ41TBE) ...
....................................................................59
19.2Operation Characteristics (CU-2Z50TBE) ......
....................................................................71
20.Exploded View and Replacement Parts List ......
............................................................................91
 Specifications, designs and contents in this Service Manual are subject to change without notice.

3
1. Safety Precautions
 Read the following “SAFETY PRECAUTIONS” carefully before installation.
 Electrical work must be installed by a licensed electrician. Be sure to use the correct rating of the power plug and
main circuit for the model to be 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 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 only.
 The items to be followed are classified by the symbols:
Symbol with white background denotes item that is PROHIBITED.
Symbol with dark background denotes item that must be carried out.
 Carry out test running to confirm that no abnormality occurs after the installation. 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.
 This appliance is not intended for accessibility by the general public.
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 indoor floor area larger than Amin (m2) [refer Table A] and without any
continuously operating ignition source. 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 Amin (m2) [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.
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 atmosfere.
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 for 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. If installation done by the user is incorrect, 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. Otherwise, it will cause the set to fall, water leakage, fire or
electrical shock.

4
WARNING
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, legislation 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 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, 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.
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, re-installation and during repairing refrigeration 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.
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.
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.
8.
Power supply connection to the room air conditioner.
Use power supply cord 3 x 1.5 mm2 type designation 60245 IEC 57 or heavier cord.
Connect the power supply cord of the air conditioner to the mains using one of the following method.
Power supply point should be in easily accessible place for power disconnection in case of emergency.
In some countries, permanent connection of this air conditioner to the power supply is prohibited.
1) Power supply connection to the receptacle using power plug.
Use an approved 15/16A power plug with earth pin for the connection to the socket.
2) Power supply connection to a circuit breaker for the permanent connection.
Use an approved 16A circuit breaker for the permanent connection.
It must be a double pole switch with a minimum 3.0 mm contact gap.
9. Installation work.
It may need two people to carry out the installation work.

5
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.
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).]
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.)
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.
• 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.
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
recognized 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.
• 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.
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 vapour being present while 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.
• 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.
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.
• Ensure that the leak detection equipment being used is suitable for use with flammable refrigerants, i.e. non sparking, adequately 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 down wind of the leaking/spill, isolate immediate hazard area and keep
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.
• Have a dry powder or CO2 fire extinguisher adjacent to the charging area.
2-5. No ignition sources
• No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has contained
flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. He/She must not
be smoking when carrying out such work.
• All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing,
removing and disposal, during which flammable refrigerant can possibly be released to the surrounding space.
• Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition
risks.
• “No Smoking” signs shall be displayed.