Panasonic CS-CZ25WKE User manual

© Panasonic Corporation 2020
Order No: PAPAMY2008037CE
Indoor Unit Outdoor Unit
CS-CZ25WKE
CS-CZ35WKE
CU-CZ25WKE
CU-CZ35WKE
Destination
North Europe
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 products dealt with in this service information by anyone else could result in serious injury or death.
IMPORTANT SAFETY 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.
AIR CONDITIONER
ON
OFF
SET
TIMER
CANCEL
TEMP
MODE
FAN SPEED/
AIR SWING
DEICE

2
TABLE OF CONTENTS
PAGE PAGE
1.Safety Precautions .............................................3
2.Precaution for Using R32 Refrigerant ..............5
3.Specifications ...................................................10
4.Features.............................................................14
5.Location of Controls and Components..........15
5.1Indoor Unit ..................................................15
5.2Outdoor Unit ...............................................15
5.3Remote Control ..........................................15
6.Dimensions .......................................................16
6.1Indoor Unit & Remote Control ....................16
6.2Outdoor Unit ...............................................17
7.Refrigeration Cycle Diagram ...........................18
8.Block Diagram ..................................................19
9.Wiring Connection Diagram ............................20
9.1Indoor Unit ..................................................20
9.2Outdoor Unit ...............................................21
10.Electronic Circuit Diagram ..............................22
10.1Indoor Unit ..................................................22
10.2Outdoor Unit ...............................................23
11.Printed Circuit Board .......................................24
11.1Indoor Unit ..................................................24
11.2Outdoor Unit ...............................................26
12.Installation Instruction.....................................27
12.1Select the Best Location.............................27
12.2Indoor Unit ..................................................28
12.3Outdoor Unit ...............................................32
13.Installation and Servicing Air Conditioner
using R32 ..........................................................38
13.1About R32 Refrigerant................................38
13.2Characteristics of R32 Refrigerant .............38
13.3Refrigerant piping installation • Tools used in
services ......................................................40
13.4New installation, Relocation, Repairing of
Refrigerant Cycle System The Procedures....
....................................................................44
13.5Piping installation of R32............................45
13.6Installation, Relocation, and Service ..........46
13.7Repairing of refrigerant cycle / Brazing point .
....................................................................50
13.8<Reference> Analysis method for no error
code, no cooling / no warming....................56
14.Operation Control.............................................58
14.1Basic Function ............................................58
14.2Indoor Fan Motor Operation .......................59
14.3Outdoor Fan Motor Operation ....................60
14.4Airflow Direction..........................................61
14.5Timer Control..............................................63
14.6Random Auto Restart Control ....................63
14.7Indication Panel ..........................................63
14.8Quiet Operation (Cooling Mode/Cooling Area
of Dry Mode)...............................................64
14.9Quiet Operation (Heating) ..........................64
14.10Powerful Mode Operation...........................64
14.11+8/15°C Heat Operation .............................65
15.Protection Control ............................................66
15.1Protection Control for All Operations..........66
15.2Protection Control for Cooling & Soft Dry
Operation....................................................68
15.3Protection Control for Heating Operation ...69
16.Servicing Mode .................................................71
16.1Auto OFF/ON Button ..................................71
16.2Heat Only Operation...................................72
16.3Remote Control Button...............................73
17.Troubleshooting Guide....................................80
17.1Refrigeration Cycle System........................80
17.2Relationship Between the Condition of the
Air Conditioner and Pressure and Electric
Current........................................................81
17.3Breakdown Self Diagnosis Function...........82
17.4Error Codes Table ......................................83
17.5Self-diagnosis Method................................85
18.Disassembly and Assembly Instructions ... 113
18.1Indoor Electronic Controllers, Cross Flow
Fan and Indoor Fan Motor Removal
Procedures .............................................. 113
18.2Outdoor Electronic Controller Removal
Procedure ................................................ 118
19.Technical Data ............................................... 119
19.1Cool Mode Performance Data................. 119
19.2Heat Mode Performance Data................. 120
20.Service Data ................................................... 121
20.1Cool Mode Outdoor Air Temperature
Characteristic........................................... 121
20.2Heat Mode Outdoor Air Temperature
Characteristic........................................... 123
20.3Piping Length Correction Factor.............. 125
21.Exploded View and Replacement Parts List......
......................................................................... 126
21.1Indoor Unit ............................................... 126
21.2Outdoor Unit ............................................ 129
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.
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 Installation 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 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.
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. Do not tie up the power supply cord into a bundle by band. Abnormal temperature rise on power supply cord may happen.
5. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury.
6. Do not sit or step on the unit, you may fall down accidentally.
7. Keep plastic bag (packaging material) away from small children, it may cling to nose and mouth and prevent breathing.
8.
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.
9. 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 inju
r
y or death.
10. Do not add or replace refrigerant other than specified type. It may cause product damage, burst and injury etc.
11.
For R32/R410A model, use piping, flare nut and tools which is specified for R32/R410A 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.
For R32 and R410A, the same flare nut on the outdoor unit side and pipe can be used.
Since the working pressure for R32/R410A is higher than that of refrigerant R22 model, replacing conventional piping and
flare nuts on the outdoor unit side are recommended.
If reuse piping is unavoidable, refer to instruction “IN CASE OF REUSING EXISTING REFRIGERANT PIPING”
Thickness for copper pipes used with R32/R410A 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.

4
WARNING
12. Engage authorized dealer or specialist for installation. If installation done by the user is incorrect, it will cause water leakage,
electrical shock or fire.
13. For refrigeration system work, lnstall according to this installation instructions strictly. If installation is defective, it will cause
water leakage, electrical shock or fire.
14. Use the attached accessories parts and specified parts for installation. Otherwise, it will cause the set to fall, water leakage, fire or
electrical shock.
15. 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.
16.
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.
17.
Do not use joint cable for indoor/outdoor connection cable. Use the specified indoor/outdoor connection cable, refer to instruction
5
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.
18. 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.
19.
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.
20.
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.
21.
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.
22. 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.
23. After completion of installation, confirm there is no leakage of refrigerant gas. It may generate toxic gas when the refrigerant
contacts with fire.
24. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when the refrigerant contacts with fire.
25. Be aware that refrigerants may not contain an odour.
26. 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 ref
r
igerant, 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 mm2type 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.
10. Keep any required ventilation openings clear of obstruction.

5
2. Precaution for Using R32 Refrigerant
Pay careful attention to the following precaution points and the installation work procedures.
WARNING
1.
When connecting flare at indoor side, make sure that the flare connection is used only once, if torqued up and released, the
flare must be remade. Once the flare connection was torqued up correctly and leak test was made, thoroughly clean and dry the
surface to remove oil, dirt and grease by following instructions of silicone sealant. Apply neutral cure (Alkoxy type) & ammonia-
free silicone sealant that is non-corrosive to copper & brass to the external of the flared connection to prevent the ingress of
moisture on both the gas & liquid sides. (Moisture may cause freezing and premature failure of the connection)
2.
The appliance shall be stored, installed and operated 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.
3.
The mixing of different refrigerants within a system is prohibited. 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).]
4. Ensure 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.)
5.
Operation, maintenance, repairing and refrigerant recovery should be carried out by trained and certified personnel in the use of
flammable refrigerants and as recommended by the manufacturer. Any personnel conducting an operation, servicing or
maintenance on a system or associated pa
r
ts of the equipment should be trained and certified.
6. Any part of refrigerating circuit (evaporators, air coolers, AHU, condensers or liquid receivers) or piping should not be located in
the proximity of heat sources, open flames, operating gas appliance or an operating electric heater.
7. The user/owner or their authorized representative shall regularly check the alarms, mechanical ventilation and detectors, at
least once a year, where as required by national regulations, to ensure their correct functioning.
8. A logbook shall be maintained. The results of these checks shall be recorded in the logbook.
9. In case of ventilations in occupied spaces shall be checked to confirm no obstruction.
10.
Before a new refrigerating system is put into service, the person responsible for placing the system in operation should ensure
that trained and certified operating personnel are instructed on the basis of the instruction manual about the construction,
supervision, operation and maintenance of the refrigerating system, as well as the safety measures to be observed, and the
properties and handling of the refrigerant used.
11.
The general requirement of trained and certified personnel are indicated as below:
a) Knowledge of legislation, regulations and standards relating to flammable refrigerants; and,
b) Detailed knowledge of and skills in handling flammable refrigerants, personal protective equipment, refrigerant leakage
prevention, handling of cylinders, charging, leak detection, recovery and disposal; and,
c) Able to understand and to apply in practice the requirements in the national legislation, regulations and Standards; and,
d) Continuously undergo regular and further training to maintain this expertise.
12. Air-conditioner piping in the occupied space shall be installed in such a way to protect against accidental damage in operation
and service.
13. Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping.
14. Ensure protection devices, refrigerating piping and fittings are well protected against adverse environmental effects (such as the
danger of water collecting and freezing in relief pipes or the accumulation of dirt and debris).
15. Expansion and contraction of long runs piping in refrigerating systems shall be designed and installed securely (mounted and
guarded) to minimize the likelihood hydraulic shock damaging the system.
16. Protect the refrigerating system from accidental rupture due to moving furniture or reconstruction activities.
17.
To ensure no leaking, field-made refrigerant joints indoors shall be tightness tested. The test method shall have a sensitivity of 5
grams per year of refrigerant or better under a pressure of at least 0,25 times the maximum allowable pressure (>1.04MPa, max
4.15MPa). No leak shall be detected.

6
CAUTION
1.
General
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.
In case of field charge, the effect on refrigerant charge caused by the different pipe length has to be quantified, measured
and labelled.
Always contact to local municipal offices for proper handling.
Ensure the actual refrigerant charge is in accordance with the room size within which the refrigerant containing parts are
installed.
Ensure refrigerant charge not to leak.
Wear appropriate protective equipment, including respiratory protection, as conditions warrant.
Keep all sources of ignition and hot metal surfaces away.
2.
Servicing
2-1. Qualification of workers
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.
The system is inspected, regularly supervised and maintained by a trained and certified service personnel who is employed
by the person user or party responsible.
2-2. Checks to the area
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 #2-3 to #2-7 must be followed before conducting work on the
system.
2-3. Work procedure
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.
2-4. General work area
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. Always ensure away from source, at least 2 meter of safety distance, or zoning of free
space area of at least 2 meter in radius.
2-5. 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.
2-6. 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 CO2fire extinguisher adjacent to the charging area.
2-7. 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.

7
CAUTION
2-8. Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot
work.
A degree of ventilation shall continue during the period that the work is carried out.
The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere.
2-9. Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the correct specification.
At all times the manufacturer’s maintenance and service guidelines shall be followed.
If in doubt consult the manufacturer’s technical department for assistance.
The following checks shall be applied to installations using flammable refrigerants.
- The actual refrigerant charge is in accordance with the room size within which the refrigerant containing parts are
installed.
- The ventilation machinery and outlets are operating adequately and are not obstructed.
- If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant.
- Marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall be corrected.
- Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance
which may corrode refrigerant containing components, unless the components are constructed of materials which are
inherently resistant to being corroded or are properly protected against being so corroded.
2-10. Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures.
Initial safety checks shall include but not limit to:-
- That capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking.
- That there is no live electrical components and wiring are exposed while charging, recovering or purging the system.
- That there is continuity of earth bonding.
At all times the manufacturer’s maintenance and service guidelines shall be followed.
If in doubt consult the manufacturer’s technical department for assistance.
If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is
satisfactorily dealt with.
If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall
be used.
The owner of the equipment must be informed or reported so all parties are advised thereinafter.
3.
Repairs to sealed components
During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon
prior to any removal of sealed covers, etc.
If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating form
of leak detection shall be located at the most critical point to warn of a potentially hazardous situation.
Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not
altered in such a way that the level of protection is affected. This shall include damage to cables, excessive number of
connections, terminals not made to original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the
ingress of flammable atmospheres.
Replacement parts shall be in accordance with the manufacturer’s specifications.
NOTE: The use of silicon sealant may inhibit the effectiveness of some types of leak detection equipment.
Intrinsically safe components do not have to be isolated prior to working on them.
4.
Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the
permissible voltage and current permitted for the equipment in use.
Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable
atmosphere.
The test apparatus shall be at the correct rating.
Replace components only with parts specified by the manufacturer. Unspecified parts by manufacturer may result ignition
of refrigerant in the atmosphere from a leak.
5.
Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse
environmental effects.
The check shall also take into account the effects of aging or continual vibration from sources such as compressors or
fans.

8
CAUTION
6.
Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the searching or detection of refrigerant leaks.
A halide torch (or any other detector using a naked flame) shall not be used.
The following leak detection methods are deemed acceptable for all refrigerant systems.
- No leaks shall be detected when using detection equipment with a sensitivity of 5 grams per year of refrigerant or
better under a pressure of at least 0,25 times the maximum allowable pressure (>1.04MPa, max 4.15MPa) for
example, a universal sniffer.
- Electronic leak detectors may be used to detect flammable refrigerants, but the sensitivity may not be adequate, or
may need re-calibration.
(Detection equipment shall be calibrated in a refrigerant-free area.)
- Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
- Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the
refrigerant employed and the appropriate percentage of gas (25 % maximum) is confirmed.
- Leak detection fluids are also suitable for use with most refrigerants, for example, bubble method and fluorescent
method agents. The use of detergents containing chlorine shall be avoided as the chlorine may react with the
refrigerant and corrode the copper pipe-work.
- If a leak is suspected, all naked flames shall be removed/extinguished.
- If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or
isolated (by means of shut off valves) in a part of the system remote from the leak. The precautions in #7 must be
followed to remove the refrigerant.
7.
Removal and evacuation
When breaking into the refrigerant circuit to make repairs – or for any other purpose – conventional procedures shall be
used.
However, it is important that best practice is followed since flammability is a consideration.
The following procedure shall be adhered to:
• remove refrigerant -> • purge the circuit with inert gas -> • evacuate -> • purge with inert gas ->
• open the circuit by cutting or brazing
The refrigerant charge shall be recovered into the correct recovery cylinders.
The system shall be purged with OFN to render the appliance safe. (remark: OFN = oxygen free nitrogen, type of inert gas)
This process may need to be repeated several times.
Compressed air or oxygen shall not be used for this task.
Purging shall be achieved by breaking the vacuum in the system with OFN and continuing to fill until the working pressure
is achieved, then venting to atmosphere, and finally pulling down to a vacuum.
This process shall be repeated until no refrigerant is within the system.
When the final OFN charge is used, the system shall be vented down to atmospheric pressure to enable work to take
place.
This operation is absolutely vital if brazing operations on the pipe work are to take place.
Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and there is ventilation available.
8.
Charging procedures
In addition to conventional charging procedures, the following requirements shall be followed.
- Ensure that contamination of different refrigerants does not occur when using charging equipment.
- Hoses or lines shall be as short as possible to minimize the amount of refrigerant contained in them.
- Cylinders shall be kept in an appropriate position according to the instructions.
- Ensure that the refrigerating system is earthed prior to charging the system with refrigerant.
- Label the system when charging is complete (if not already).
- Extreme care shall be taken not to over fill the refrigerating system.
Prior to recharging the system it shall be pressure tested with OFN (refer to #7).
The system shall be leak tested on completion of charging but prior to commissioning.
A follow up leak test shall be carried out prior to leaving the site.
Electrostatic charge may accumulate and create a hazardous condition when charging and discharging the refrigerant.
To avoid fire or explosion, dissipate static electricity during transfer by grounding and bonding containers and equipment
before charging/discharging.

9
CAUTION
9.
Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its
details.
It is recommended good practice that all refrigerants are recovered safely.
Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of
recovered refrigerant.
It is essential that electrical power is available before the task is commenced.
a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure that:
• mechanical handling equipment is available, if required, for handling refrigerant cylinders;
• all personal protective equipment is available and being used correctly;
• the recovery process is supervised at all times by a competent person;
• recovery equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with instructions.
h) Do not over fill cylinders. (No more than 80 % volume liquid charge).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the
equipment are removed from site promptly and all isolation valves on the equipment are closed off.
k) Recovered refrigerant shall not be charged into another refrigerating system unless it has been cleaned and checked.
Electrostatic charge may accumulate and create a hazardous condition when charging or discharging the refrigerant.
To avoid fire or explosion, dissipate static electricity during transfer by grounding and bonding containers and equipment
before cha
r
ging/discharging.
10.
Labelling
Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant.
The label shall be dated and signed.
Ensure that there are labels on the equipment stating the equipment contains flammable refrigerant.
11.
Recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that
all refrigerants are removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed.
Ensure that the correct number of cylinders for holding the total system charge are available.
All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e. special cylinders
for the recovery of refrigerant).
Cylinders shall be complete with pressure relief valve and associated shut-off valves in good working order.
Recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand
and shall be suitable for the recovery of concerning the equipment that is at hand and shall be suitable for the recovery of
flammable refrigerants.
In addition, a set of calibrated weighing scales shall be available and in good working order.
Hoses shall be complete with leak-free disconnect couplings and in good condition.
Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained and that
any associated electrical components are sealed to prevent ignition in the event of a refrigerant release.
Consult manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant
Waste Transfer Note arranged.
Do not mix refrigerants in recovery units and especially not in cylinders.
If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to
make certain that flammable refrigerant does not remain within the lubricant.
The evacuation process shall be carried out prior to returning the compressor to the suppliers.
Only electric heating to the compressor body shall be employed to accelerate this process.
When oil is drained from a system, it shall be carried out safely.

10
3. Specifications
Model Indoor CS-CZ25WKE CS-CZ35WKE
Outdoor CU-CZ25WKE CU-CZ35WKE
Performance Test Condition EUROVENT EUROVENT
Power Supply Phase, Hz Single, 50 Single, 50
V 230 230
Min. Mid. Max. Min. Mid. Max.
Cooling
Capacity
kW 0.85 2.50 3.00 0.85 3.50 4.00
BTU/h 2900 8530 10200 2900 11900 13600
kcal/h 730 2150 2580 730 3010 3440
Running Current A – 2.50 – – 4.30 –
Input Power W 185 535 730 185 935 1.14k
Annual Consumption kWh – 268 – – 468 –
EER
W/W 4.59 4.67 4.11 4.59 3.74 3.51
BTU/hW 15.68 15.94 13.97 15.68 12.73 11.93
kcal/hW 3.95 4.02 3.53 3.95 3.22 3.02
ErP
Pdesign kW 2.5 3.5
SEER (W/W) 6.6 6.4
Annual
Consumption kWh 133 191
Class A++ A++
Power Factor % – 93 – – 95 –
Indoor Noise
dB-A (H/L/Q-Lo) 39 / 25 / 22 42 / 28 / 22
Power Level dB 55 / – / – 58 / – / –
Outdoor Noise
dB-A (H/L/Q-Lo) 46 / - / 43 48 / - / 45
Power Level dB 61 / - / - 63 / - / -
Heating
Capacity
kW 0.85 3.40 5.20 0.85 4.00 6.70
BTU/h 2900 11600 17700 2900 13600 22800
kcal/h 730 2920 4470 730 3440 5760
Running Current A – 3.40 – – 4.50 –
Input Power W 180 730 1.45k 180 980 2.00k
COP
W/W 4.72 4.66 3.59 4.72 4.08 3.35
BTU/hW 16.11 15.89 12.21 16.11 13.88 11.40
kcal/hW 4.06 4.00 3.08 4.06 3.51 2.88
ErP
Pdesign kW 2.8 3.6
Tbivalent °C -10 -10
SCOP (W/W) 4.3 4.3
Annual
Consumption kWh 912 1172
Class A+ A+
Power Factor % – 93 – – 95 –
Indoor Noise dB-A (H/L/Q-Lo) 42 / 27 / 20 43 / 33 / 20
Power Level dB 58 / – / – 59 / – / –
Outdoor Noise dB-A (H/L/Q-Lo) 47 / - / 44 50 / - / 47
Power Level dB 62 / - / - 65 / - / -
Low Temp. : Capacity (kW) / I.Power (W) / COP 3.77 / 1.28k / 2.95 4.86 / 1.77k / 2.75
Extr Low Temp. : Capacity (kW) / I.Power (W) / COP 3.30 / 1.30k / 2.54 4.05 / 1.85k / 2.19

11
Model Indoor CS-CZ25WKE CS-CZ35WKE
Outdoor CU-CZ25WKE CU-CZ35WKE
Max Current (A) / Max Input Power (W) 7.0 / 1.60k 8.8 / 2.00k
Starting Current (A) 3.40 4.50
Compressor
Type Hermetic Motor / Rotary Hermetic Motor / Rotary
Motor Type Brushless (4-poles) Brushless (4-poles)
Output Power W 900 900
Indoor Fan
Type Cross-Flow Fan Cross-Flow Fan
Material ASG30 ASG30
Motor Type DC / Transistor (8 poles) DC / Transistor (8 poles)
Input Power W 43.8 43.8
Output Power W 30 30
Speed
Lo- Cool rpm 640 660
Heat rpm 620 640
Lo Cool rpm 700 810
Heat rpm 780 980
Me Cool rpm 900 1030
Heat rpm 1000 1140
Hi Cool rpm 1120 1240
Heat rpm 1240 1310
SHi Cool rpm 1170 1290
Heat rpm 1310 1380
Outdoor Fan
Type Propeller Fan Propeller Fan
Material PP PP
Motor Type DC Motor (8 poles) DC Motor (8 poles)
Input Power W – –
Output Power W 40 40
Speed Hi Cool rpm 840 880
Heat rpm 800 820
Moisture Removal L/h (Pt/h) 1.5 (3.2) 2.0 (4.2)
Indoor
Airflow
Lo- Cool m3/min (ft3/min) 5.92 (209) 5.94 (209)
Heat m3/min (ft3/min) 5.70 (201) 5.73 (202)
Lo Cool m3/min (ft3/min) 6.57 (232) 7.53 (265)
Heat m3/min (ft3/min) 7.44 (262) 9.33 (329)
Me Cool m3/min (ft3/min) 8.75 (309) 9.86 (348)
Heat m3/min (ft3/min) 9.84 (347) 11.03 (445)
Hi
Cool m3/min (ft3/min) 11.20 (395) 12.10 (425)
Heat m3/min (ft3/min) 12.50 (440) 12.80 (450)
SHi Cool m3/min (ft3/min) 11.69 (412) 12.62 (445)
Heat m3/min (ft3/min) 13.22 (466) 13.57 (479)
Outdoor
Airflow Hi Cool m3/min (ft3/min) 31.30 (1105) 32.90 (1160)
Heat m3/min (ft3/min) 29.70 (1050) 30.50 (1075)

12
Model Indoor CS-CZ25WKE CS-CZ35WKE
Outdoor CU-CZ25WKE CU-CZ35WKE
Refrigeration
Cycle
Control Device Expansion Valve Expansion Valve
Refrigerant Oil cm3FW50S (450) FW50S (450)
Refrigerant Type g (oz) R32, 840 (29.7) R32, 840 (29.7)
F-Gas
GWP 675 675
CO2eq (ton)
(Precharged Amount /
Maximum Charged Amount)
0.570 / 0.650 0.570 / 0.650
Dimension
Height (I/D / O/D) mm (inch) 290 (11-7/16) / 622 (24-1/2) 290 (11-7/16) / 622 (24-1/2)
Width (I/D / O/D) mm (inch) 779 (30-11/16) / 824 (32-15/32) 779 (30-11/16) / 824 (32-15/32)
Depth (I/D / O/D) mm (inch) 209 (8-1/4) / 299 (11-25/32) 209 (8-1/4) / 299 (11-25/32)
Weight Net (I/D / O/D) kg (lb) 8 (18) / 33 (73) 8 (18) / 33 (73)
Stacking No. (CS / CU / CZ) Actual Stacking Condition (12 / 6 / -) Actual Stacking Condition (12 / 6 / -)
Piping
Pipe Diameter (Liquid / Gas) mm (inch) 6.35 (1/4) / 9.52 (3/8) 6.35 (1/4) / 9.52 (3/8)
Standard length m (ft) 5.0 (16.4) 5.0 (16.4)
Length range (min – max) m (ft) 3 (9.8) ~ 20 (65.6) 3 (9.8) ~ 20 (65.6)
I/D & O/D Height different m (ft) 10.0 (32.8) 10.0 (32.8)
Additional Gas Amount g/m (oz/ft) 10 (0.1) 10 (0.1)
Length for Additional Gas m (ft) 7.5 (24.6) 7.5 (24.6)
Drain Hose Inner Diameter mm 16.2 16.2
Length mm 650 650
Indoor Heat
Exchanger
Fin Material Aluminium (Pre Coat) Aluminium (Pre Coat)
Fin Type Slit Fin Slit Fin
Row × Stage × FPI 2 × 15 × 17 2 × 15 × 21
Size (W × H × L) mm 580 × 315 × 25.4 580 × 315 × 25.4
Outdoor
Heat
Exchanger
Fin Material Aluminium (Pre Coat) Aluminium (Pre Coat)
Fin Type Corrugated Fin Corrugated Fin
Row × Stage × FPI 2 × 28 × 17 2 × 28 × 17
Size (W × H × L) mm 36.4 × 588 × 606.6 36.4 × 588 × 606.6
Air Filter Material Polypropelene Polypropelene
Type One-touch One-touch
Power Supply Outdoor Outdoor
Power Supply Cord A Nil Nil
Thermostat Electronic Control Electronic Control
Protection Device Electronic Control Electronic Control

13
Model Indoor CS-CZ25WKE CS-CZ35WKE
Outdoor CU-CZ25WKE CU-CZ35WKE
Dry Bulb Wet Bulb Dry Bulb Wet Bulb
Indoor
Operation
Range
Cooling Maximum °C (°F) 32 (89.6) 23 (73.4) 32 (89.6) 23 (73.4)
Minimum °C (°F) 16 (60.8) 11 (51.8) 16 (60.8) 11 (51.8)
Heating Maximum °C (°F) 30 (86.0) – 30 (86.0) –
Minimum °C (°F) 16 (60.8) – 16 (60.8) –
+8/15°C
Heat
Maximum °C (°F) 15 (59.0) – 15 (59.0) –
Minimum °C (°F) 8 (46.4) – 8 (46.4) –
Outdoor
Operation
Range
Cooling Maximum °C (°F) 43 (109.4) 26 (78.8) 43 (109.4) 26 (78.8)
Minimum °C (°F) 16 (60.8) 11 (51.8) 16 (60.8) 11 (51.8)
Heating Maximum °C (°F) 24 (75.2) 18 (64.4) 24 (75.2) 18 (64.4)
Minimum °C (°F) -25 (-13.0) – -25 (-13.0) –
+8/15°C
Heat
Maximum °C (°F) – – – –
Minimum °C (°F) -25 (-13.0) – -25 (-13.0) –
1. Cooling capacities are based on indoor temperature of 27°C Dry Bulb (80.6°F Dry Bulb), 19.0°C Wet Bulb (66.2°F Wet Bulb) and outdoor air
temperature of 35°C Dry Bulb (95°F Dry Bulb), 24°C Wet Bulb (75.2°F Wet Bulb)
2. Heating capacities are based on indoor temperature of 20°C Dry Bulb (68°F Dry Bulb) and outdoor air temperature of 7°C Dry Bulb
(44.6°F Dry Bulb), 6°C Wet Bulb (42.8°F Wet Bulb)
3. Heating low temperature capacity, Input Power and COP measured at 230 V, indoor temperature of 20°C, outdoor 2/1°C.
4. Heating extreme low temperature capacity, Input Power and COP measured at 230 V, indoor temperature of 20°C, outdoor -7/-8°C.
5. Standby power consumption ≤2.0W (when switched OFF by remote control, except under self-protection control).
6. SEER and SCOP classification is at 230V only in accordance with EN-14825. For heating, SCOP indicates the value of only Average heating
season. Other fiche data indicates in an attached sheet.
7. Specifications are subjected to change without prior notice for further improvement.

14
4. Features
Inverter Technology
oWider output power range
oEnergy saving
oMore precise temperature control
Environment Protection
oNon-ozone depletion substances refrigerant (R32)
Long Installation Piping
oLong piping up to 20 meters
Easy to use remote control
Quality Improvement
oRandom auto restart after power failure for safety restart operation
oGas leakage protection
oPrevent compressor reverse cycle
oInner protector to protect compressor
Operation Improvement
oQuiet mode to reduce the indoor unit operation sound
oPowerful mode to reach the desired room temperature quickly
o+8/15°C HEAT operation is designed to provide heating at low temperature settings. It is used in houses
unoccupied during winter, for the purpose of protecting equipment or housing appliances which may be
destroyed by extreme cold weather
Serviceability Improvement
oBreakdown Self Diagnosis function

15
5. Location of Controls and Components
5.1 Indoor Unit
AUTO
OFF/ON
TIMER
POWER
DEICE
+8/15C
HE
A
T
POWER
TIMER
DEICE
+8/15°C
HEAT
Aluminium Fin
Auto OFF/ON button
• Use when remote control is misplace
d
or malfunction occurs.
Air Filters
Front panel
Remote Control
receiver
Vertical Airflow
direction louver
• Do not adjust by hand.
Horizontal Airflow
direction louver
• Manually adjustable.
INDICATOR
Air Purifying Filter
5.2 Outdoor Unit
5.3 Remote Control
AIR CONDITIONER
ON
OFF
SET
TIMER
CANCEL
TEMP
MODE
FA N SPEED/
AIR SWING
Airflow direction selectionAirflow direction selection
Fan speed/Quiet selection
Transmitter
Operation mode
+8/15°C Heat operation
OFF/ON
Powerful operation
Temperature setting
Remote control
display
Timer setting
Check Clock setting

16
6. Dimensions
6.1 Indoor Unit & Remote Control
144.5
59
87
64
<Remote Control Holder>
<Remote Control>
22
<Side View>
<Side View>
290
60
41
209
Right piping
hole
<Top View>
<Front View>
<Bottom View>
<Rear View>
16.4
264.4
Unit: mm
Relative position between the indoor unit and the installation plate <Front View>
779
Air intake
direction
Air outlet
direction
Left piping
hole
99.555
6060
590 41-61
Liquid side
Gas side
115mm TO
HOLE CENTER
PIPE HO LE
CENTER
497.4
170
110
115
Installation
plate
Indoor unit
external
dimensions
line
168
115
216
365 415
Left
piping
hole
Right
piping
hole
AIR CONDITIONER
ON
OFF
SET
TIMER
CANCEL
TEMP
MODE
FAN SPEED/
AIR SWING

17
6.2 Outdoor Unit
Anchor Bolt Pitch
330 × 540
Space necessary for
installation
100mm
100mm
1000mm
Unit : mm
22 (124) (53.4)
330
622 167
97 32
540 160
824 68.5
37 299
<Top View>
<Front View><Side View>
<Side View>
3-way valve at Gas side
(Low Pressure)
2-way valve at Liquid side
(High Pressure)
69 61
( 23 )

18
7. Refrigeration Cycle Diagram
INDOOR OUTDOOR
INTAKE
AIR
TEMP.
SENSOR
INTAKE
TEMP.
SENSOR
COMP.
TEMP.
SENSOR
PIPE
TEMP.
SENSOR
PIPE
TEMP.
SENSOR
LIQUID
SIDE
2-WAY
VALVE
3-WAY
VALVE
GAS
SIDE
COOLING
HEAT EXCHANGER
(EVAPORATOR)
HEATING
COMPRESSOR
4-WAYS VALVE
HEAT EXCHANGER
(CONDENSER)
MUFFLER
MUFFLER
STRAINER
EXPANSION
VALVE

19
8. Block Diagram
3 2 1
(OUTDOOR UNIT)(INDOOR UNIT)
SINGLE PHASE POWER SUPPLY
1Ø 230V
50HZ
FUSE 301
TEMPERATURE FUSE
M
SC
U
L
N
+
MS
3 ~
FUSE3
FUSE6
FUSE5
RY-PWR
PTC
PTC2
REACTOR
FUSE1
NOISE FILTER
SC
+
TH1
NTC
4-WAYS
VALVE
SEN1 FUSE8
RY-AC
MS
3 ~
IC19

20
9. Wiring Connection Diagram
9.1 Indoor Unit
TO
OUTDOOR
UNIT
1
2
3
TERMINAL
BOARD
TEMP. FUSE 102ºC
Y/G
BL AC306 (BLK)
AC303 (WHT)
AC304 (RED)
G301 (GRN)
W
R
G
EVAPORATOR
FAN
MOTOR
W
WWWWWWW
BL
R
B
FUSE301
T3.15A L250V
1
4
17
71
7
5
1
CN-CNT
(WHT)
NOISE
FILTER
CIRCUIT
COMMUNICATION
CIRCUIT
RECTIFICATION
CIRCUIT
CN-FM
(WHT)
CN-DISP
(YLW)
CN-DISP
(WHT)
ELECTRONIC CONTROLLER
(DISPLAY & RECEIVER)
REMOTE CONTROLLER
COMPLETE
ELECTRONIC CONTROLLER
(MAIN)
(SW01)
1
4
CN-RMT
(WHT)
BR
M
R
O
Y
P
1
5
1
5
CN-STM1
(WHT) UP DOWN
LOUVER MOTOR
4
1
t°
t°
CN-TH
(RED)
PIPING TEMP. SENSOR
(THERMISTOR)
SUCTION TEMP. SENSOR
(THERMISTOR)
REAR VIEW OF TERMINAL BOARD
REMARKS
BLUE (B)
BROWN (BR)
BLACK (BL)
WHITE (W)
RED (R)
YELLOW/GREEN (Y/G)
PINK (P)
ORANGE (O)
YELLOW (Y)
GREEN (G)
R
BL
G
W
Y/G (EVA)
23
1
Y
M