Panasonic CU-CZ25TKE Service Manual
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Panasonic CU-CZ25TKE Service Manual

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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.
There are special components used in this equipment which are important for safety. These parts are marked by
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.
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
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.
POWER /
DEICE
TIMER
HEAT
WARNING
IMPORTANT SAFETY NOTICE
PRECAUTION OF LOW TEMPERATURE
CAUTION
Indoor Unit
CS-CZ25TKE
CS-CZ35TKE
Order No: PAPAMY1707098CE
Outdoor Unit
CU-CZ25TKE
CU-CZ35TKE
Destination
N. Europe
in the Schematic
© Panasonic Corporation 2017

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Summary of Contents for Panasonic CU-CZ25TKE

  • Page 1 – 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. © Panasonic Corporation 2017...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PAGE PAGE Safety Precautions ..........3 14.8 Quiet Operation (Cooling Mode/Cooling       Area of Dry Mode) ........60   Precaution for Using R32 Refrigerant ....5     14.9 Quiet Operation (Heating) ......60     14.10 Powerful Mode Operation ......60 Specifications .............

  • Page 3: Safety Precautions

    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. ...
  • Page 4 WARNING Use the attached accessories parts and specified parts for installation. Otherwise, it will cause the set to fall, water leakage, fire or electrical shock. 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.

  • Page 5: Precaution For Using R32 Refrigerant

    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 Since the working pressure is higher than that of refrigerant R22 models, some of the piping and installation and service tools are special.
  • Page 6 CAUTION 2-6. 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. ...
  • Page 7 CAUTION 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: •...
  • Page 8 CAUTION 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. ...

  • Page 9: Specifications

    3. Specifications Indoor CS-CZ25TKE CS-CZ35TKE Model Outdoor CU-CZ25TKE CU-CZ35TKE Performance Test Condition EUROVENT EUROVENT Phase, Hz Single, 50 Single, 50 Power Supply Min. Mid. Max. Min. Mid. Max. 0.85 2.50 3.00 0.85 3.50 4.00 Capacity BTU/h 2900 8530 10200 2900...
  • Page 10 Indoor CS-CZ25TKE CS-CZ35TKE Model Outdoor CU-CZ25TKE CU-CZ35TKE Type Hermetic Motor / Rotary Hermetic Motor / Rotary Compressor Motor Type Brushless (4-poles) Brushless (4-poles) Output Power Type Cross-Flow Fan Cross-Flow Fan Material ASG20K1 ASG20K1 Motor Type DC / Transistor (8 poles)
  • Page 11 Indoor CS-CZ25TKE CS-CZ35TKE Model Outdoor CU-CZ25TKE CU-CZ35TKE Weight Net (I/D / O/D) kg (lb) 8 (18) / 36 (79) 8 (18) / 36 (79) Stacking No. (CS / CU / CZ) Actual Stacking Condition (12 / 6 / -) Actual Stacking Condition (12 / 6 / -)

  • Page 12: Features

    4. Features  Inverter Technology Wider output power range Energy saving More precise temperature control  Environment Protection Non-ozone depletion substances refrigerant (R32)  Long Installation Piping Long piping up to 20 meters  Easy to use remote control  Quality Improvement Random auto restart after power failure for safety restart operation Gas leakage protection...

  • Page 13: Location Of Controls And Components

    5. Location of Controls and Components Indoor Unit Air Purifying Filter Air Filters Auto OFF/ON button • Use when remote control is misplaced Front panel or malfunction occurs. Aluminium Fin INDICATOR (Green/ POWER/ DEICE Blue) (Orange) TIMER Horizontal Airflow +8/15°C (Green) direction louver Remote Control...

  • Page 14: Dimensions

    6. Dimensions Indoor Unit & Remote Control <Top View> <Side View> <Side View> Air intake <Front View> direction Air outlet Right direction piping Left hole piping hole <Bottom View> <Remote Control> <Rear View> 41-61 <Remote Control Holder> Gas side Liquid side Relative position between the indoor unit and the installation plate <Front View>...

  • Page 15: Outdoor Unit

    Outdoor Unit <Top View> 68.5 Space necessary for installation (124) (53.4) 100mm 100mm 1000mm Anchor Bolt Pitch 330 × 540 <Side View> <Side View> <Front View> 3-way valve at Gas side 2-way valve at Liquid side Unit : mm (Low Pressure) (High Pressure)

  • Page 16: Refrigeration Cycle Diagram

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

  • Page 17: Block Diagram

    8. Block Diagram...

  • Page 18: Wiring Connection Diagram

    9. Wiring Connection Diagram Indoor Unit SW01 TERMINAL AC306 BOARD (BL) FUSE301 AC303 T3.15A L250V (WHT) UP DOWN AC304 LOUVER MOTOR TEMP. FUSE (RED) OUTDOOR 102°C (4.5A) G301 UNIT NOISE (GRN) FILTER PIPING TEMP. SENSOR CIRCUIT (THERMISTOR) t° EVAPORATOR COMMUNICATION t°...

  • Page 19: Outdoor Unit

    V (BLU) YELLOW: (YLW) GRAY: (GRY) W (YLW) CN-MTR1 GREEN: (GRN) BROWN: (BRW) (WHT) ORANGE: (ORG) YELLOW/GREEN: (YLW/GRN) COMPRESSOR Resistance of Compressor Windings MODEL CU-CZ25TKE/CU-CZ35TKE CONNECTION 9RD132XAB21 1.897 Ω 1.907 Ω 1.882 Ω Note: Resistance at 20°C of ambient temperature.

  • Page 20: Electronic Circuit Diagram

    10. Electronic Circuit Diagram 10.1 Indoor Unit ELECTRONIC CONTROLLER (MAIN) 5.1k SW01 TERMINAL AC306 BOARD NONE NONE (BL) 0.1μ FUSE301 NONE AC303 T3.15A L250V (WHT) AC304 TEMP. FUSE (RED) OUTDOOR 102°C (4.5A) G301 UP DOWN UNIT NOISE (GRN) LOUVER MOTOR FILTER CIRCUIT IC03...

  • Page 21: Outdoor Unit

    10.2 Outdoor Unit SINGLE PHASE TO INDOOR UNIT POWER SUPPLY (BLK) (WHT) (RED) REACTOR TERMINAL (BLK) (WHT) (RED) BOARD ELECTRONIC CONTROLLER RAT2 RAT1 (GRY) (GRY) 15.8k 15.0k 220μ DATA (RED) 1μ COMMUNICATION 1μ OUTDOOR AIR TEMP. CN-TH1 NOISE FILTER CIRCUIT SENSOR (THERMISTOR) (WHT) FUSE 103...

  • Page 22: Printed Circuit Board

    11. Printed Circuit Board 11.1 Indoor Unit 11.1.1 Main Printed Circuit Board AC304 AC303 G301 AC-306 CN-FM CN-STM1 CN-RMT CN-DISP CN-CNT CN-TH JP1 (Random Auto Restart enable/disable)
  • Page 23 11.1.2 Indicator & Receiver Printed Circuit Board LED201 LED202 LED203 CN-DISP...

  • Page 24: Outdoor Unit

    11.2 Outdoor Unit 11.2.1 Main Printed Circuit Board POWER TRANSISTOR (IPM) RAT1 RAT2 CURRENT CN-TANK TRANSFORMER CN-MTR1 (CT) CN-TH1 CN-STM CN-HOT DATA AC-WHT CN-MTR2 AC-BLK ACN2...

  • Page 25: Installation Instruction

    12. Installation Instruction 12.1 Select the Best Location 12.1.1 Indoor Unit 12.1.3 Indoor/Outdoor Unit Installation  Diagram Do not install the unit in excessive oil fume area such as kitchen, workshop and etc.  There should not be any heat source or steam WARNING near the unit.

  • Page 26: Indoor Unit

    12.2 Indoor Unit 12.2.1 How to Fix Installation Plate The mounting wall shall be strong and solid enough to prevent it from vibration. Wall Wall Wall More than 1 More than 1 Indoor unit More than 2 screw Installation plate 1 228 mm (1.0~1.5HP) 241.5 mm (2.0HP) PIPE...
  • Page 27 12.2.3 Indoor Unit Installation • Do not turn over the unit without it’s shock absorber during pull out the piping. It may cause intake grille damage. • Use shock absorber during pull out the piping to protect the intake grille from damage. Piping Piping Shock absorber...
  • Page 28 Exchange the drain hose and cap Rear view for left piping installation Connection cable Piping Drain hose More than 950 mm Connection cable Drain hose Drain cap Adjust the piping slightly Drain hose downwards. Sleeve for piping hole • • How to pull the piping and drain hose out, in case of the In case of left piping how to insert the embedded piping.
  • Page 29 Terminal Board Tape Earth Wire longer than others AC Connection cable wires for Indoor & outdoor safety reason connection cable Escapement Holder Indoor & outdoor Recommended connection cable length (mm) Outdoor unit Recommended length (mm) 35 35 35 55 WARNING This equipment must be properly earthed.

  • Page 30: Outdoor Unit

    12.3 Outdoor Unit 12.3.1 Install the Outdoor Unit  After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram. Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10 mm). When installing at roof, please consider strong wind and earthquake. Please fasten the installation stand firmly with bolt, screws or nails.
  • Page 31 AIR PURGING METHOD IS PROHIBITED FOR R32 SYSTEM 12.3.3 Evacuation of the Equipment WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure. Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation. There is no extra refrigerant in the outdoor unit for air purging.
  • Page 32 12.3.4 Connect the Cable to the Outdoor Unit Remove the control board cover from the unit by loosening the screw. Cable connection to the power supply through Isolating Devices (Disconnecting means). Connect approved type polychloroprene sheathed power supply cord 3 x 1.5 mm type designation 60245 IEC 57 or heavier cord to the terminal board, and connect the others end of the cord to Isolating Devices (Disconnecting means).
  • Page 33 12.3.6 How to Take Out Front Grille Please follow the steps below to take out front grille if necessary such as when servicing. Set the vertical airflow direction louvers to the horizontal position. Remove the 2 caps on the front grille as shown in the illustration at right, and then remove the 2 mounting screws.
  • Page 34 12.3.9 Outdoor Unit Drain Water  Water will drip from the basepan hole area during defrost function.  To avoid water dripping, do not stand or place objects at this area. Hole 12.3.10 Check the Drainage  Open front panel and remove air filters. (Drainage checking can be carried out without removing the front grille.) ...

  • Page 35: Installation And Servicing Air Conditioner Using R32

    13. Installation and Servicing Air Conditioner using R32 13.1 About R32 Refrigerant For air conditioning refrigerants such as R410A, the refrigerants were collected back in order to prevent their air dissipation, to curbe the global warming impact, in case they were released into the atmosphere. In the “4th Environmental Basic Plan”, 80% reduction of greenhouse gas emissions by 2050 is required, and due to this requirement, further reduction in the emission of high greenhouse effect gas, such as CFCs, is required.
  • Page 36 2. Characteristic of Pressure As shown in Table 2, R32 does not have much difference in vapor pressure at the same refrigerant temperature comparing to R410A, but comparing to R22, it is higher at 1.6 times more. Thus, the same as in case of R410A, it is necessary to do installation and service using high-pressure tools and components.

  • Page 37: Refrigerant Piping Installation • Tools Used In Services

    13.3 Refrigerant piping installation • Tools used in services 13.3.1 Required Tools R32 refrigerant air conditioners use the common parts as R410A air conditioners for two-way valves and three-way valves (diameters of service ports); thus, they maintain commonality in the maintenance of the compressive strength, the size of pipe flaring, and the size of flare nuts as R410A.
  • Page 38 3. Torque wrenches (diameters 1/2, 5/8) Manifold gauges / Charging hoses In order to strengthen the compressive strength, the diameters of wrenches change depending on the flare nut sizes. Torque wrenches Differences in charging hoses Differences in torque wrenches (common R410A) Normal 5.1 MPa 3.4 MPa...
  • Page 39 7. HFC refrigerant_Electric gas leakage tester 9. Refrigerant cylinders R32 refrigerant is often used for other mixed Refrigerant cylinders for R410A are painted in pink, refrigerant (R410A, R404A, R407C etc.). Therefore, and the ones for R32 are painted in other colors that the usage of existing HFC detectors is possible, but in might subject to change according to the international order to detect more accurately, we recommend to...
  • Page 40 11. Tools used for refrigerant piping installations and services Tools for R410A Common with R32 Possibility of usage for R22 ○ ○ Pipe cutters, reamers or scrapers ○ ○ Flare tools (clutch type) ○ ○ Torque wrench (1/4, 3/8) ○ ×...

  • Page 41: New Installation, Relocation, Repairing Of Refrigerant Cycle System The Procedures

    13.4 New installation, Relocation, Repairing of Refrigerant Cycle System The Procedures Relocation Repairing refrigerant cycle Installation Indoor / outdoor units and piping Pump down Refrigerant recovery • Displacing pipes and wires, and displacing indoor / outdoor units Prevention of impurity •...

  • Page 42: Piping Installation Of R32

    13.5 Piping installation of R32 13.5.1 Pipe materials used and flaring Copper pipes are used for refrigerant piping. Pipes Pipe thickness which comply with JIS Regulations need to be used. Room air conditioners which use R410A and R32 O and OL materials Thickness (mm) have higher pressure;...

  • Page 43: Installation, Relocation, And Service

    13.6 Installation, Relocation, and Service 13.6.1 Air purge and gas leak test for new installation (using new refrigerant pipes) using vacuum pump (From the point of view of global environment protection, do not release CFCs into the atmosphere during installation work) 1.
  • Page 44 13.6.2 Process of refrigerant recovery 1. Connect the center charging hose of manifold gauge to the in-let side of recovery device. 2. Connect the valves of the discharge side of recovery device and liquid side of refrigerant cylinder with red hose (charging hose).
  • Page 45 13.6.3 Relocation 1. Removing the air conditioning unit a) Recovery of outdoor unit refrigerant by pumping down Press “forced cooling button” (as a general rule, since 1998 the name of cooling testing button is changed, and this name is unified within the air conditioning industry), and then you are able to start cooling operation in which the room temperature is low, and you can recover the refrigerant from the outdoor unit.
  • Page 46 13.6.6 Re-insertion of refrigerant in service When re-insertion is needed, follow the procedures to ensure the insertion of new refrigerant at correct amount. 1. Attach charging hose (blue) to the service port of the outdoor unit. 2. Attach charging hose (red) to the vacuum pump. Fully open the 2-way and 3-way valves. 3.

  • Page 47: Repairing Of Refrigerant Cycle / Brazing Point

    13.7 Repairing of refrigerant cycle / Brazing point 13.7.1 Preparation for repairing of refrigerant cycle / brazing Brazing which is a technique needed for repairing refrigerant cycle requires advanced technique and experience, and this brazing procedure can only be performed by the workers who completed “Gas Welding Skill Training” regulated by the Occupational Safety and Health Act, and went through the training programs of refrigerant operations.
  • Page 48 2. Cylinder without adjustment valve side gauge pressure is adjusted by the adjuster. Check the both side valves of the torch and open the cylinder valve to check the remaining refrigerant in the cylinder. Caution: Do not attach oil component on the connection port of the adjuster. Especially, use an oxygen cylinder adjuster which is no oil substance type.
  • Page 49 13.7.5 Types of flame Types of flame change based on the proportion of propane and oxygen. [Neutral Flame] Perform brazing with this flame (This is a flame when oxygen and propane are mixed at proper proportion, and has lesser effect on the brazed metals) White core flame 10 ~ 15 mm...
  • Page 50 13.7.7 Selection of brazing material Use BAg brazing material (silver solder) to increase the welding performance. Tensile strength Composition of ingredients (%) Temperature (°C) Characteristics (Reference) Category Standard Brazing Base Number Solidus Liquidus Kgf•cm applications temp material Liquidity is good at low temperature, 49.0 14.5...
  • Page 51 13.7.10 Checking of brazing (insert) points 1. No impurity on the brazing point Gap 0.025 ~ 0.05 mm If dirt or oil is attached on the brazing point, the brazing filler metal does not reach to junction, and Inner diameter ø6.45 it may cause poor welding.
  • Page 52 (Reference) Melting temperature of copper • • • • • • • Approx. 1083°C Maximum temperature obtained in propane and oxygen • • • • • • • Approx. 1083°C The important point is to heat the bonding part uniformly within a short period of time until reaching to the brazing temperature in the following manner.

  • Page 53: Reference> Analysis Method For No Error Code, No Cooling / No Warming

    13.8 <Reference> Analysis method for no error code, no cooling / no warming 13.8.1 Preparation for appropriate diagnosis In order to obtain appropriate operation characteristics, minimum 15 minutes or more operation time [testing operation (rated operation)] is required. 1. Method of rated operation (rated operation) For the models which have two buttons of “emergency operation and forced cooling operation”, press forced cooling button once.
  • Page 54 1. Measuring temperature 1) Indoor unit suction temperature, release temperature, temperature difference, → Measure by thermometer 2) 2-way valve pipe temperature in cooling mode is low temperature (benchmark：5 ~ 10°C), in heating mode is medium temperature (benchmark：25 ~ 35°C). 3) 3-way valve pipe temperature in cooling mode is low temperature (benchmark：7 ~ 15°C) in heating mode is high temperature (benchmark：38 ~ 50°C).

  • Page 55: Operation Control

    14. Operation Control 14.1 Basic Function Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting.

  • Page 56: Indoor Fan Motor Operation

    14.1.5 Automatic Operation  This mode can be set using remote control and the operation is decided by remote control setting temperature, remote control operation mode and indoor intake air temperature.  During operation mode judgment, indoor fan motor (with speed of Lo-) is running for 30 seconds to detect the indoor intake air temperature.

  • Page 57: Outdoor Fan Motor Operation

    ii Auto Fan Speed [Cooling, Dry]  According to room temperature and setting temperature, indoor fan speed is determined automatically.  When set temperature is not achieved, the indoor fan will operate according to pattern below.  When set temperature achieved, the indoor fan speed will be fixed. When thermostat off, the fan stop periodically. [Fan] ...
  • Page 58 14.4.1 Vertical Airflow Vane Angle (°) Operation Mode Usual (Ventilation) 10 ~ 40 Auto Control with dew 10 ~ 40 Cooling, Fan Usual (Ventilation) 17.5 32.5 Manual Control with dew 17.5 32.5 Usual 10 ~ 40 Auto Control with dew 10 ~ 40 Usual 17.5...

  • Page 59: Timer Control

    14.5 Timer Control  There are 2 sets of ON and OFF timer available to turn the unit ON or OFF at different preset time.  If more than one timer had been set, the upcoming timer will be displayed and will activate in sequence. 14.5.1 ON Timer Control ...

  • Page 60: Quiet Operation (Cooling Mode/Cooling Area Of Dry Mode)

    14.8 Quiet Operation (Cooling Mode/Cooling Area of Dry Mode) A. Purpose To provide quiet cooling operation compare to normal operation. B. Control condition a. Quiet operation start condition When “POWERFUL/QUIET” button at remote control is pressed twice. QUIET will be shown on remote control display. b.

  • Page 61: 8/15°C Heat Operation

    14.11 +8/15°C Heat Operation  +8/15°C Heat operation provides heating at low setting temperature in unoccupied houses during winter for the purpose of protecting equipments or housing appliances which may be destroyed by the extreme cold weather.  This operation can be ON by pressing the +8/15°C heat button on the remote control. ...

  • Page 62: Protection Control

    15. Protection Control 15.1 Protection Control for All Operations 15.1.1 Restart Control (Time Delay Safety Control)  The Compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on again by pressing OFF/ON button at remote control within this period. ...
  • Page 63 15.1.4 Compressor Overheating Prevention Control  Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of frequency are as below.  If compressor discharge temperature exceeds 103°C, compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking.

  • Page 64: Protection Control For Cooling & Soft Dry Operation

    15.2 Protection Control for Cooling & Soft Dry Operation 15.2.1 Outdoor Air Temperature Control  The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.  This control will begin 1 minute after the compressor starts. ...

  • Page 65: Protection Control For Heating Operation

    15.2.6 Odor Cut Control  To reduce the odor released from the unit. Start Condition  AUTO FAN Speed is selected during COOL or DRY operation.  During freeze prevention control and timer preliminary operation, this control is not applicable. Control content ...

  • Page 66: Servicing Mode

    16. Servicing Mode 16.1 Auto OFF/ON Button AUTO OPERATION MODE The Auto operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be used to operate air conditioner with limited function if remote control is misplaced or malfunction. TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE) The Test Run operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5 seconds.

  • Page 67: Heat Only Operation

    REMOTE CONTROL RECEIVING SOUND OFF/ON MODE The Remote Control Receiving Sound OFF/ON Mode will be activated if the Auto OFF/ON button is pressed continuously for more than 16 seconds (4 “beep” sounds will occur at 16th seconds to identify the Remote Control Receiving Sound Off/On Mode is in standby condition) and press “AC Reset”...

  • Page 68: Remote Control Button

    16.2.2 Operation mode during Heating Only Operation  The table below shows the operation mode comparison when Heating Only Operation Mode Activated and Deactivated. Operation Heating Only Operation Mode Activated Heating Only Operation Mode Deactivated Mode After 30s sampling, the unit will judge the operation After 30s sampling, regardless of the indoor intake or mode base on remote controller temperature setting and AUTO...
  • Page 69 16.3.2 RESET (RC)  To clear and restore the remote control setting to factory default. Press once to clear the memory. 16.3.3 RESET (AC)  To restore the unit’s setting to factory default. Press once to restore the unit’s setting. 16.3.4 TIMER ▲...
  • Page 70 To enter zone 2 area: (Press continuously for T ≥ 5 secs) Once T ≥ 5secs Normal display Enter Zone1 Enter Zone2 mode [range (50~99)] Function & Options list: Note: The functions described in the table may not be applicable to the model and may subject to change without further notice.

  • Page 71: Troubleshooting Guide

    17. Troubleshooting Guide 17.1 Refrigeration Cycle System In order to diagnose malfunctions, make sure that Normal Pressure and Outlet Air Temperature (Standard) there are no electrical problems before inspecting the Gas pressure Outlet air refrigeration cycle. MPa (kg/cm temperature (°C) Such problems include insufficient insulation, problem Cooling Mode 0.9 ~ 1.2 (9 ~ 12)

  • Page 72: Relationship Between The Condition Of The Air Conditioner And Pressure And Electric Current

    17.2 Relationship Between the Condition of the Air Conditioner and Pressure and Electric Current Cooling Mode Heating Mode Condition of the Electric current Electric current air conditioner Low Pressure High Pressure Low Pressure High Pressure during operation during operation Insufficient refrigerant ...

  • Page 73: Breakdown Self Diagnosis Function

    17.3 Breakdown Self Diagnosis Function 17.3.1 Self Diagnosis Function (Three Digits Alphanumeric Code)  Every press of the button (up or down) will Once abnormality has occurred during operation, increase abnormality numbers and transmit the unit will stop its operation, and Timer LEDs abnormality code signal to the main unit.

  • Page 74: Error Codes Table

    17.4 Error Codes Table Diagnosis Abnormality / Abnormality Protection Problem Check location display Protection control Judgment Operation No memory of failure — Normal operation — — Indoor fan only  Indoor/outdoor wire terminal Indoor/outdoor operation can Indoor/outdoor After operation for ...
  • Page 75 Diagnosis Abnormality / Abnormality Protection Problem Check location display Protection control Judgment Operation  Check indoor/outdoor Wrong wiring and connection wire and connection Abnormal wiring or — — connecting pipe, expansion pipe piping connection valve abnormality  Expansion valve and lead wire and connector ...

  • Page 76: Self-Diagnosis Method

    17.5 Self-diagnosis Method 17.5.1 H11 (Indoor/Outdoor Abnormal Communication) Malfunction Decision Conditions  During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal. Malfunction Caused  Faulty indoor unit PCB.
  • Page 77 17.5.2 H12 (Indoor/Outdoor Capacity Rank Mismatched) Malfunction Decision Conditions  During startup, error code appears when different types of indoor and outdoor units are interconnected. Malfunction Caused  Wrong models interconnected.  Wrong indoor unit or outdoor unit PCBs mounted. ...
  • Page 78 17.5.3 H14 (Indoor Intake Air Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the indoor intake air temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 79 17.5.4 H15 (Compressor Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.  Faulty sensor.
  • Page 80 17.5.5 H16 (Outdoor Current Transformer) Malfunction Decision Conditions  An input current, detected by Current Transformer CT, is below threshold value when the compressor is operating at certain frequency value for 3 minutes. Malfunction Caused  Lack of gas  Broken CT (current transformer) ...
  • Page 81 17.5.6 H19 (Indoor Fan Motor – DC Motor Mechanism Locked) Malfunction Decision Conditions  The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550rpm or < 50rpm). Malfunction Caused ...
  • Page 82 17.5.7 H23 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 83 17.5.8 H27 (Outdoor Air Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 84 17.5.9 H28 (Outdoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 85 17.5.10 H30 (Compressor Discharge Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 86 17.5.11 H32 (Outdoor Heat Exchanger Temperature Sensor 2 Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor heat exchanger temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.
  • Page 87 17.5.12 H33 (Unspecified Voltage between Indoor and Outdoor) Malfunction Decision Conditions  The supply power is detected for its requirement by the indoor/outdoor transmission. Malfunction Caused  Wrong models interconnected.  Wrong indoor unit and outdoor unit PCBs used.  Indoor unit or outdoor unit PCB defective.
  • Page 88 17.5.13 H34 (Outdoor Heat Sink Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor heat sink temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 89 17.5.14 H36 (Outdoor Gas Pipe Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor gas pipe temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 90 17.5.15 H37 (Outdoor Liquid Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor liquid pipe temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 91 17.5.16 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked) Malfunction Decision Conditions  The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor. Malfunction Caused  Operation stops due to short circuit inside the fan motor winding. ...
  • Page 92 17.5.17 H98 (Error Code Stored in Memory and no alarm is triggered / no TIMER LED flashing) Malfunction Decision Conditions  Indoor high pressure is detected when indoor heat exchanger is detecting very high temperature when the unit is operating in heating operation. ...
  • Page 93 17.5.18 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry) Error Code will not display (no Timer LED blinking) but store in EEPROM Malfunction Decision Conditions  Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C) Malfunction Caused ...
  • Page 94 17.5.19 F11 (4-way valve Abnormality) Malfunction Decision Conditions  When indoor heat exchanger is cold during heating (except deice) or when indoor heat exchanger is hot during cooling and compressor operating, the 4-way valve is detected as malfunction. Malfunction Caused ...
  • Page 95 17.5.20 F17 (Indoor Standby Units Freezing Abnormality) Malfunction Decision Conditions  When the different between indoor intake air temperature and indoor pipe temperature is above 10°C or indoor pipe temperature is below -1.0°C. Remark: When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor unit and H39 to other indoor unit(s).
  • Page 96 17.5.21 F90 (Power Factor Correction Protection) Malfunction Decision Conditions  To maintain DC voltage level supply to power transistor.  To detect high DC voltage level after rectification. Malfunction Caused  During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit main PCB senses abnormal DC voltage level for power transistors.
  • Page 97 17.5.22 F91 (Refrigeration Cycle Abnormality) Malfunction Decision Conditions  The input current is low while the compressor is running at higher than the setting frequency. Malfunction Caused  Lack of gas.  3-way valve close. Troubleshooting...
  • Page 98 17.5.23 F93 (Compressor Rotation Failure) Malfunction Decision Conditions  A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Caused  Compressor terminal disconnect  Faulty Outdoor PCB  Faulty compressor Troubleshooting When F93 indication happens For safety reason and to prevent component breakdown, always switch off the power before...
  • Page 99 17.5.24 F95 (Outdoor High Pressure Protection: Cooling or Soft Dry) Malfunction Decision Conditions  During operation of cooling or soft dry, when outdoor unit heat exchanger high temperature data is detected by the outdoor unit heat exchanger thermistor. Malfunction Caused ...
  • Page 100 17.5.25 F96 (IPM Overheating) Malfunction Decision Conditions  During operating of cooling and heating, when IPM temperature data (120°C) is detected by the IPM temperature sensor. Multi Models Only Compressor Overheating: During operation of cooling and heating, when the compressor OL is activated. Heat Sink Overheating: During operation of cooling and heating, when heat sink temperature data (90°C) is detected by the heat sink temperature sensor.
  • Page 101 17.5.26 F97 (Compressor Overheating) Malfunction Decision Conditions  During operation of cooling and heating, when compressor tank temperature data (112°C) is detected by the compressor tank temperature sensor. Malfunction Caused  Faulty compressor tank temperature sensor  2/3 way valve closed ...
  • Page 102 17.5.27 F98 (Input Over Current Detection) Malfunction Decision Conditions  During operation of cooling and heating, when an input over-current (X value in Total Running Current Control) is detected by checking the input current value being detected by current transformer (CT) with the compressor running.
  • Page 103 17.5.28 F99 (DC Peak Detection) Malfunction Decision Conditions During startup and operation of cooling and heating, when inverter DC peak data is received by the outdoor internal DC Peak sensing circuitry. Malfunction Caused  DC current peak due to compressor failure. ...

  • Page 104: Disassembly And Assembly Instructions

    18. Disassembly and Assembly Instructions WARNING High Voltage are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks. 18.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor Removal Procedures 18.1.1...
  • Page 105 Pull out the main Detach connectors as labeled from the electronic controller electronic controller, then pull out the halfway. electronic controller gently. AC303 Detach the Earth wire screw, terminal wire (BL), terminal wire (RED) and earth wire screw (Green). CN-FM Detach the CN-DISP connector then remove the indicator PCB complete.
  • Page 106 18.1.4 To Remove Control Board 12. Remove 4 screws holding the control board together then pull out the control board. Figure 6 18.1.5 To Remove Cross Flow Fan and Indoor Fan Motor Remove the screw that holds the cross flow fan and the fan motor shaft. Figure 7 Holdfast Remove the bearing by pulling...
  • Page 107 16. Push the holdfast to the left and lift up the evaporator. Evaporator 17. Remove the cross flow fan from 18. Fan motor can be removed after the the unit by pulling it to the left and removal of cross flow fan. downward.

  • Page 108: Outdoor Electronic Controller Removal Procedure

    18.2 Outdoor Electronic Controller Removal Procedure Caution! When handling electronic controller, be careful of electrostatic discharge. 1. Remove the 5 screws of the Top Panel. 5. Remove the Control Board as follows: Fig. 1 Fig. 4 2. Remove the 8 screws of the Front Panel. Fig.

  • Page 109: Technical Data

    Technical data provided are based on the air conditioner running under free frequency. 19.1 Cool Mode Performance Data Unit setting: Standard piping length, Hi Fan, Cool mode at 16°C Voltage: 230V 19.1.1 CS-CZ25TKE/CU-CZ25TKE Indoor (°C) Outdoor DB (°C) 19.0 2699...

  • Page 110: Heat Mode Performance Data

    19.2 Heat Mode Performance Data Unit setting: Standard piping length, Hi Fan, Heat mode at 30°C Voltage: 230V 19.2.1 CS-CZ25TKE/CU-CZ25TKE Indoor (°C) Outdoor WB (°C) 1921 1209 2549 1377 2959 1323 3294 1245 4120 1418 1995 1122 2646 1275 3135...

  • Page 111: Service Data

    Condition Indoor room temperature: 27°C Dry Bulb/19°C Wet Bulb Unit setting: Standard piping length, forced cooling at 16°C, Hi fan Compressor frequency: Rated for cooling operation Piping length: 5m Voltage: 230V 20.1.1 CS-CZ25TKE CU-CZ25TKE 17.50 17.00 16.50 16.00 15.50 15.00 Outdoor Air Temperature (°C)
  • Page 112 20.1.2 CS-CZ35TKE CU-CZ35TKE 16.00 15.00 14.00 13.00 12.00 11.00 10.00 Outdoor Air Temperature (°C) 5.50 5.00 4.50 4.00 3.50 3.00 2.50 2.00 Outdoor Air Temperature (°C) 0.75 0.70 0.65 0.60 Outdoor Air Temperature (°C)

  • Page 113: Heat Mode Outdoor Air Temperature Characteristic

    Indoor room temperature: 20°C Dry Bulb/ -°C Wet Bulb Unit setting: Standard piping length, forced heating at 30°C, Hi fan Compressor frequency: Rated for Heating operation Piping length: 5m Voltage: 230V 20.2.1 CS-CZ25TKE CU-CZ25TKE Outdoor Air Temperature (°C) 3.70 3.20 2.70 2.20 1.70...
  • Page 114 20.2.2 CS-CZ35TKE CU-CZ35TKE Outdoor Air Temperature (°C) 5.00 4.50 4.00 3.50 3.00 2.50 2.00 1.50 Outdoor Air Temperature (°C) Outdoor Air Temperature (°C)

  • Page 115: Piping Length Correction Factor

    20.3 Piping Length Correction Factor The characteristic of the unit has to be corrected in accordance with the piping length. 20.3.1 CS-CZ25TKE CU-CZ25TKE CS-CZ35TKE CU-CZ35TKE 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.95 0.94 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Pipe Length (m) 1.10...

  • Page 116: Exploded View And Replacement Parts List

    21. Exploded View and Replacement Parts List 21.1 Indoor Unit CWH55025J CWH55051J Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 117 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CS-CZ25TKE CS-CZ35TKE REMARK CHASSIS COMPLETE CWD50C1903 ← FAN MOTOR ARW7666ACCB ← CROSS-FLOW FAN COMPLETE CWH02C1159 ← BEARING ASSY CWH64K1006 ← SCREW - CROSS-FLOW FAN CWH551146 ← EVAPORATOR ACXB30C02040 ACXB30C02110 FLARE NUT (LIQUID) CWT251048 ←...

  • Page 118: Outdoor Unit

    21.2 Outdoor Unit Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 119 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CU-CZ25TKE CU-CZ35TKE REMARK CHASSIS COMPLETE CWD52K1310 ← HEATER CWA341072 ← FAN MOTOR BRACKET CWD541167-1 ← SCREW - FAN MOTOR BRACKET CWH551217 ← FAN MOTOR L6CAYYYL0049 ← SCREW - FAN MOTOR MOUNT CWH55252J ←...

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