Panasonic CS-MZ20UFEA Service Manual
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Panasonic CS-MZ20UFEA Service Manual

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Please file and use this manual together with the service manual for Model No. CU-2E12SBE, CU-2E15SBE, CU-2E18SBE,
CU-2Z35TBE, CU-2Z41TBE, CU-2Z50TBE, Order No. PAPAMY1601015CE, PAPAMY1702035CE.
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.
WARNING
IMPORTANT SAFETY NOTICE
PRECAUTION OF LOW TEMPERATURE
CAUTION
Order No: PAPAMY1805090CE
Indoor Unit
CS-MZ20UFEA
Destination
Europe
Turkey
in the Schematic
© Panasonic Corporation 2018.

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Summary of Contents for Panasonic CS-MZ20UFEA

  • 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 2018.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PAGE PAGE 1. Safety Precautions ..........3 15.4 Automatic Operation ........60 15.5 Indoor Fan Motor Operation .......60 2. Precaution for Using R32 Refrigerant ....6 15.6 Powerful Mode Operation ......60 3. Specifications ........... 10 15.7 Auto Restart Control ........60 15.8 Indication Panel ..........60 4.

  • Page 3: Safety Precautions

    1. Safety Precautions  Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing.  Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model installed. ...
  • Page 4 WARNING Do not perform flare connection inside a building or dwelling or room, when joining the heat exchanger of indoor unit with interconnecting piping. Refrigerant connection inside a building or dwelling or room must be made by brazing or welding. Joint connection of indoor unit by flaring method can only be made at outdoor or at outside of a building or dwelling or room.
  • Page 5 CAUTION Do not touch the sharp aluminium fin, sharp parts may cause injury. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the furniture. 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.

  • Page 6: 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 7 CAUTION 2-5. No ignition sources  No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has contained flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. He/She must not be smoking when carrying out such work.
  • Page 8 CAUTION Leak detection methods  Electronic leak detectors shall 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. ...
  • Page 9 CAUTION 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. Recovery ...

  • Page 10: Specifications

    3. Specifications Model Indoor CS-MZ20UFEA Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.80 2.00 2.90 Capacity BTU/h 6140 6820 9890 Running Current – 2.70 – Input Power Annual Consumption – – 5.29 3.64 3.37...
  • Page 11 Model Indoor CS-MZ20UFEA Weight Net (I/D) kg (lb) 13 (29) Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter 28.5 Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row ×...
  • Page 12 (as shown in the table above) Example: The indoor units’ combination below is possible to connect to CU-2Z41TBE. (Total nominal capacity of indoor units is between 3.2kW to 6.0kW) 1) Two CS-MZ20UFEA only. (Total nominal cooling capacity is 4.0kW)
  • Page 13 Example: The indoor units’ combination below is possible to connect to CU-2E15SBE. (Total nominal capacity of indoor units is between 3.2kW to 5.7kW) 1) Two CS-MZ20UFEA only. (Total nominal cooling capacity is 4.0kW) Note*: Above outdoor unit is contains and operates with refrigerant R410A gas.

  • Page 14: Features

    4. Features  Inverter Technology Wider output power range Energy saving Quick Cooling Quick Heating More precise temperature control  Environment Protection Non-ozone depletion substances refrigerant (R32)  Easy to use remote control  Quality Improvement Random auto restart after power failure for safety restart operation Gas leakage protection Prevent compressor reverse cycle Inner protector to protect compressor...

  • Page 15: Location Of Controls And Components

    5. Location of Controls and Components Indoor Unit INDICATOR Airflow Direction Louver Air Outlet Aluminium Fin Auto OFF/ON button • Use when remote control is misplaced or a malfunction occurs. Receiver Remote Control Front Panel Air filters Air Inlet String Remote Control LCD display OFF/ON...

  • Page 16: Dimensions

    6. Dimensions Indoor Unit <Top View> <Side View> <Front View> <Side View> 49.7 <Back View> <Remote Control> <Remote Control Holder> <Bottom View> 65.4 80.5 80.4 Unit : mm...

  • Page 17: Refrigeration Cycle Diagram

    7. Refrigeration Cycle Diagram INDOOR LIQUID SIDE 2-WAY VALVE PIPE TEMP. INTAKE SENSOR 2 TEMP. SENSOR PIPE TEMP. SENSOR 1 HEAT EXCHANGER (EVAPORATOR) SIDE 3-WAY VALVE COOLING HEATING...

  • Page 18: Block Diagram

    8. Block Diagram (INDOOR UNIT) FUSE 301 VA301 TEMP. FUSE...

  • Page 19: Wiring Connection Diagram

    9. Wiring Connection Diagram Indoor Unit REMARKS : BLUE : PINK CN-CNT BR : BROWN TERMINAL CN–RMT (WHT) FUSE301 : ORANGE BOARD (WHT) T3.15A L250V BL : BLACK AC306 (BLK) NOISE G/GRN : GREEN FILTER Y/YLW : YELLOW AC303 (WHT) HAJEM-A W/WHT : WHITE CIRCUIT...

  • Page 20: Electronic Circuit Diagram

    10. Electronic Circuit Diagram 10.1 Indoor Unit CN-CNT CN–RMT (WHT) (WHT) *F302 5.1k *C57 *C56 1000p 1000p 0.1µ HAJEM-A (WHT) TERMINAL 0.01µ FUSE301 BOARD T3.15A L250V AC306 (BLK) NOISE FILTER AC303 (WHT) 0.01µ CIRCUIT IC02 CN–STM1 AC304 (RED) (BLU) COMMUNICATION CIRCUIT UP DOWN LOUVER MOTOR...

  • Page 21: Printed Circuit Board

    11. Printed Circuit Board 11.1 Indoor Unit 11.1.1 Main Printed Circuit Board AC306 G301 CN-FM AC304 AC303 (Random Auto Restart enable/disable) CN-NANO CN-RMT CN-DISP CN-STM1 CN-CNT CN-STM2 CN-RCV HAJEM-A CN-TH...
  • Page 22 11.1.2 Display Printed Circuit Board CN-DISP 11.1.3 Receiver Printed Circuit Board CN-RCV LED201...

  • Page 23: Installation Instruction

    12. Installation Instruction 12.1 Indoor Unit Required Materials  Read catalog and other technical materials and prepare the required materials.  Pipe Size Reducer (CZ-MA1P) for CS-Z50*** when connect to multi. Other Items to be Prepared (Locally Purchased) Product name Remarks VP20 (outer diameter ø26mm), VP30 (outer diameter ø38mm), Reducer (VP30-VP20) ;...

  • Page 24: Remote Controller

    12.1.1.2 Remote Controller  Signals may not be transmitted and received Attaching the remote control holder to the wall correctly when the remote controller is operated while in the holder. Take the remote controller in Remote control holder fixing screws 7 your hand to operate the unit.

  • Page 25: Drain Piping

    12.1.3.1.2 To drill a hole in the wall and install a sleeve of piping Insert the piping sleeve to the hole. Indoor Outdoor Fix the bushing to the sleeve. Cut the sleeve until it extrudes about 15 mm 15 mm from the wall.

  • Page 26: Indoor Unit Installation

    12.1.3.1.5 Indoor unit installation  For floor installations, secure the indoor unit using 6 screws.  For wall installations, secure the mounting plate using 7 screws and the indoor unit using 4 screws. Temporarily secure the mounting plate to the wall, make sure that the panel is completely level, and mark the drilling points on the wall.

  • Page 27: Concealed Installation

    12.1.3.2.3 Refrigerant piping See Refrigerant piping under Exposed Installation. Wall (Unit: mm) Left bottom piping Right bottom piping Unit piping position Hole location Right/left side piping Wall 12.1.3.3 Concealed installation  Only item peculiar to this installation method are given here. See Exposed installation for additional instructions. 12.1.3.3.1 Preparation ...

  • Page 28: Connecting The Refrigerant Piping

    12.1.4 Connecting the Refrigerant Piping 12.1.4.1 Connecting The Piping to Indoor For connection joint of all models Seal sufficiently the flare nut (both gas and liquid sides) Please make flare after inserting flare nut (locate at with neutral cure (Alkoxy type) & ammonia-free joint portion of tube assembly) onto the copper pipe.
  • Page 29 12.1.4.4 Insulating the refrigerant piping  Attach the pipe after checking for gas leakage, Auxiliary pipe Auxiliary pipe Auxiliary pipe described above. Slit Slit Cut the insulated portion of the on-site piping, matching it up with the connecting portion. Insulation sheet Secure the slit on the auxiliary pipe side with the butt joint on the connection pipe using the Tape...
  • Page 30 Indoor/outdoor Conductor not Conductor Conductor WIRE STRIPPING, Wire stripping connection fully inserted fully inserted over inserted CONNECTING terminal board REQUIREMENT 5 mm or more No loose strand PROHIBITED PROHIBITED ACCEPT (gap between wires) when inserted RISK OF FIRE JOINING OF WIRES MAY CAUSE WARNING OVERHEATING AND...

  • Page 31: 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 32 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 33: 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 34 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 35 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 36 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 37: 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 38: 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 39: 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 40 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 41 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 42 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 43: 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 44 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 45 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 46 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 47 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 48 (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 49: 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 50 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 51: 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 52: 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 53: Airflow Direction

    [Heating]  According to indoor pipe temperature, automatic heating fan speed is determined as follows. RPM Increased RPM Maintain RPM Reduced Indoor Pipe Temp. B. Feedback control  Immediately after the fan motor started, feedback control is performed once every second. ...

  • Page 54: Quiet Operation (Cooling Mode/Cooling Area Of Dry Mode)

    14.3.2 Horizontal Airflow  The horizontal airflow direction louver can be adjusted manually by hand. 14.4 Quiet Operation (Cooling Mode/Cooling Area of Dry Mode)  Purpose To provide quiet cooling operation compare to normal operation.  Control condition Quiet operation start condition ...

  • Page 55: Timer Control

    14.7 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. 14.7.1 ON Timer Control ...

  • Page 56: Ha Terminal (Hajem-A)

    14.10 HA Terminal (HAJEM-A)  Enable digital connection from indoor unit to external devices.  Control items: Start/stop input. Start/stop signal output. 200~300msec ON/OFF input (Pin 1-2) Monitor output (Pin 3-4) Unit condition  Condition 1-2 (Pulse input): Unit ON/OFF condition switching with a pulse signal. (1 pulse signal: shortage status 200~300msec) 3-4 (Static output): 5V output during the unit ON.

  • Page 57: Nanoex Operation

    14.11 nanoeX Operation  Generate nanoeX (water wrapped ion particle) to moisturize skin, provide deodorization & sterilization effect.  nanoeX operation start condition During unit running at any operation mode, if nanoeX operation is activated, combination operation (operation mode + nanoeX operation) starts. During unit is OFF, if nanoeX operation is activated, nanoeX individual operation starts.
  • Page 58  nanoeX check mode To enable nanoeX check mode, during nanoeX operation ON: Normal display mode Press SW (t ≥ 0 secs) When SW pressed continuously for t ≥ 5 secs to enter service zone and press SW’s to choose function 57 Transmit “NANOEX CHECK”...

  • Page 59: Operation Control (For Multi Split Connection)

    15. Operation Control (For Multi Split Connection) During multi split connection, indoor unit’s operation controls are same with single split connection unless specified in this chapter. 15.1 Cooling operation 15.1.1 Thermostat control  Capability supply to indoor unit is OFF (Expansion valve closed) when Intake Air Temperature — Internal setting temperature <...

  • Page 60: Automatic Operation

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

  • Page 61: Servicing Mode

    16. Servicing Mode 16.1 Auto OFF/ON Button Auto OFF/ON Auto OFF/ON Auto OFF/ON Auto OFF/ON Button pressed Button pressed Button pressed Button pressed 5 sec 5 sec 5 sec Auto Operation Test Run Operation Stop Normal Cooling Operation Stop Test Run Operation Stop (Forced cooling operation) (Forced heating operation)

  • Page 62: Remote Control Button

    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 63 16.2.6 Special Setting mode LCD display area: Special setting display area (highlighted in color) Function Options (If any) Cannot enter this special setting mode under the following conditions: 1 Operation ON. 2 Under [Real/ON/OFF] time setting mode. To enter zone 1 area: Normal display Enter Zone1 mode...
  • Page 64 Function & Options list: Function Options Remark Name Remote control number selection A, B, C, D [iAUTO-X/iAUTO/iCOMF, Cool & Dry] mode set temperature [Low2] 16°C ~ [High2] selection [iAUTO-X/iAUTO/iCOMF, Cool & Dry] mode set temperature [High2] [Low2] ~ 30°C Zone 1 selection Heat mode set temperature Low1 selection 16°C ~ [High1]...

  • Page 65: Troubleshooting Guide

    17. Troubleshooting Guide 17.1 Refrigeration Cycle System In order to diagnose malfunctions, make sure that there are no Normal Pressure and Outlet Air Temperature (Standard) electrical problems before inspecting the refrigeration cycle. Gas Pressure Outlet air Temperature Such problems include insufficient insulation, problem with the (kg/cm (°C) power source, malfunction of a compressor and a fan.
  • Page 66 17.1.1 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 67: Breakdown Self Diagnosis Function

    17.2 Breakdown Self Diagnosis Function 17.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code)  When the latest abnormality code on the main Once abnormality has occurred during operation, unit and code transmitted from the remote the unit will stop its operation, and Timer LED controller are matched, power LED will light blinks.

  • Page 68: Error Codes Table

    17.3 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 69 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 70: Self-Diagnosis Method

    17.4 Self-diagnosis Method 17.4.1 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 71 17.4.2 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 72 17.4.3 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 73 17.4.4 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 74 17.4.5 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 75 17.4.6 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 > 2550 rpm or < 50 rpm) Malfunction Caused ...
  • Page 76 17.4.7 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 77 17.4.8 H24 (Indoor Pipe Temperature Sensor 2 Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger temperature sensor 2 are used to determine sensor errors. Malfunction Caused  Faulty connector connection.
  • Page 78 17.4.9 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 79 17.4.10 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 80 17.4.11 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 81 17.4.12 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 82 17.4.13 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 83 17.4.14 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 84 17.4.15 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 85 17.4.16 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 86 17.4.17 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 87 17.4.18 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 88 17.4.19 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 89 17.4.20 F11 (4-way Valve Switching Failure) 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 90 17.4.21 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 91 17.4.22 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 92 17.4.23 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 93 17.4.24 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...
  • Page 94 17.4.25 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 95 17.4.26 F96 (IPM Overheating) Malfunction Decision Conditions  During operating of cooling and heating, when IPM temperature data (100°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 96 17.4.27 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 97 17.4.28 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 98 17.4.29 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 99: Disassembly And Assembly Instructions

    18. Disassembly and Assembly Instructions WARNING High Voltage is 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 Remove the Front Panel Front Panel 1.

  • Page 100: Remove The Front Grille

    18.2 Remove the Front Grille Slide the hook to left side. 1. Release the hook in the right side of the Top Vane and then take out the Top Vane. Top Vane Front Vane 2. Take out the Front Vane. Front Grille 3.

  • Page 101: Remove The Discharge Grille

    18.3 Remove the Discharge Grille. 6. Release the 2 screws to take out of the Discharge Grille. 1. Detach the Indicator complete from the Discharge Grille and release the connector CN-DISP. Discharge Grille 2. Detach the Receiver complete from the Discharge Grille and release the connector CN-RCV.
  • Page 102 2. Release the 2 screws of the earth grounding terminal. 3. Detach the 2 terminal black & red color. 4. Release the screw of the Terminal Board. 5. Release the screw at bottom of the Control Board and then slide out hold Control Board.

  • Page 103: Remove The Drain Pan

    18.5 Remove the Drain Pan Drain Pan 1. Release the 2 screws to remove the Drain Pan. 18.6 Remove the Cross Flow Fan and Fan Motor 1. Release the 3 screws from the particular piece Evaporator. Evaporator...
  • Page 104 2. Remove the screw that holding Cross Flow Fan Motor axis. Cross Flow Fan 3. Release the 4 screws of the Fan Motor. Fan Motor can be removed after the removal of the Cross Flow Fan...

  • Page 105: Exploded View And Replacement Parts List

    19. Exploded View and Replacement Parts List 19.1 Indoor Unit 15 11 CWH55025J x 11 CWH55051AJ 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 106 SAFETY REF. NO. PARTS NAME & DESCRIPTION QTY. CS-MZ20UFEA REMARK CHASSIS-COMPLETE ACXD50C01620 FAN MOTOR BRACKET (BOTTOM) ACXD54-01370 FAN MOTOR BRACKET (TOP) ACXD54-01380 FAN MOTOR L6CBYYYL0253 SCREW-BRACKET FAN MOTOR XTN4+12CFJ CROSS-FLOW FAN-COMPLETE ACXH02C00850 EVAPORATOR COMPLETE ACXB30C17950 FLARE NUT(LIQUID) CWT251048 FLARE NUT(GAS)
  • Page 107 SAFETY REF. NO. PARTS NAME & DESCRIPTION QTY. CS-MZ20UFEA REMARK INSTALLATION INSTRUCTION ACXF60-28330 INSTALLATION INSTRUCTION ACXF60-28340 INSTALLATION INSTRUCTION ACXF60-28350 INSTALLATION INSTRUCTION ACXF60-28360 INSTALLATION INSTRUCTION ACXF60-28370 INSTALLATION INSTRUCTION ACXF60-28380 INSTALLATION INSTRUCTION ACXF60-28390 INSTALLATION INSTRUCTION ACXF60-28400 INSTALLATION INSTRUCTION ACXF60-28410 INSTALLATION INSTRUCTION ACXF60-28420...

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