Panasonic CS-MZ20UB4EA Service Manual
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Panasonic CS-MZ20UB4EA Service Manual

Indoor unit
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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-3E23SBE,
CU-3E18PBE,
CU-3Z52TBE, CU-3Z68TBE, CU-4Z68TBE, CU-4Z80TBE, CU-5Z90TBE, Order No. PAPAMY1601015CE, PAPAMY1301048CE,
PAPAMY1303046CE, PAPAMY1702035CE, PAPAMY1703049CE, PAPAMY1710082CE.
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.
CU-4E23PBE,
CU-4E27PBE,
WARNING
IMPORTANT SAFETY NOTICE
PRECAUTION OF LOW TEMPERATURE
CU-5E34PBE,
CU-2Z35TBE,
CAUTION
Order No: PAPAMY1805082CE
Indoor Unit
CS-MZ20UB4EA
Destination
Europe
Turkey
CU-2Z41TBE,
CU-2Z50TBE,
in the Schematic
© Panasonic Corporation 2018.

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Summary of Contents for Panasonic CS-MZ20UB4EA

  • 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 ........59 15.5 Indoor Fan Motor Operation .......59 2. Precaution for Using R32 Refrigerant ....6 15.6 Powerful Mode Operation ......59 3. Specifications ........... 10 15.7 Auto Restart Control ........59 15.8 Indication Panel ..........59 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-MZ20UB4EA 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-MZ20UB4EA Weight Net (I/D / PANEL) kg (lb) 18 (40) / 2.5 (6) Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type...
  • Page 12 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-MZ20UB4EA only. (Total nominal cooling capacity is 4.0kW) Remarks for CU-3Z68TBE / CU-3Z52TBE 1. The total nominal cooling capacity of indoor unit that will be connected to outdoor unit must be within connectable capacity range of indoor unit.
  • Page 13 A single outdoor unit enables air conditioning of up to four separate rooms for CU-4Z68TBE, CU-4Z80TBE. A single outdoor unit enables air conditioning of up to five separate rooms for CU-5Z90TBE. CONNECTABLE INDOOR UNIT CU-4Z68TBE CU-4Z80TBE CU-5Z90TBE ROOM 2.0kW CS-MZ20UB4EA ● ● ● ● ● ● ●...
  • Page 14 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-MZ20UB4EA only. (Total nominal cooling capacity is 4.0kW) Remarks for CU-3E23SBE / CU-3E18PBE The total nominal cooling capacity of indoor unit that will be connected to outdoor unit must be within connectable capacity range of indoor unit.
  • Page 15 A single outdoor unit enables air conditioning of up to four separate rooms for CU-4E23PBE, CU-4E27PBE. A single outdoor unit enables air conditioning of up to five separate rooms for CU-5E34PBE. CONNECTABLE INDOOR UNIT CU-4E23PBE* CU-4E27PBE* CU-5E34PBE* ROOM 2.0kW CS-MZ20UB4EA ● ● ● ● ● ● ●...

  • Page 16: 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 17: Location Of Controls And Components

    5. Location of Controls and Components Indoor Unit Control Panel POWER (Green) Receiver TIMER (Orange) POWERFUL (Orange) QUIET (Orange) AUTO AIR SWING (Orange) Auto OFF/ON button Airflow direction louver Air filter Intake grille Remote Control LCD display OFF/ON Powerful operation Temperature setting Quiet operation Operation mode...

  • Page 18: Dimensions

    6. Dimensions Indoor Unit Air Inlet <Remote Control> 530 (Hanging bolt) 650 (Ceiling opening) Gas piping Liquid piping Drain pipe <Remote Control Holder> Unit : mm...

  • Page 19: 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 20: Block Diagram

    8. Block Diagram (INDOOR UNIT) FUSE DRAIN MOTOR PUMP...

  • Page 21: Wiring Connection Diagram

    9. Wiring Connection Diagram Indoor Unit...

  • Page 22: Electronic Circuit Diagram

    10. Electronic Circuit Diagram 10.1 Indoor Unit TRANSFORMER MOTOR HAJEM-A (WHT) R42 R43 HIGH STATIC PRESSURE MOTOR CN-FM (FAN) ELECTRONIC CONTROLLER (MAIN) (WHT) SW01 CN-T2 CN-CNT CN-STM2 CN-T1 (YLW) (WHT) (YLW) (WHT) RECTIFICATION CIRCUIT CN-STM1 IC05 IC07 RECTIFICATION RECTIFICATION (WHT) CIRCUIT CIRCUIT *C57...

  • Page 23: Printed Circuit Board

    11. Printed Circuit Board 11.1 Indoor Unit 11.1.1 Main Printed Circuit Board CN-DRMTR1 CN-T2 CN-T1 T-BLK1 T-BLK2 SW01 SW02 CN-CNT CN-FM CN-TH1 CN-TH2 CN-STM1 (Random Auto Restart enable/disable) CN-STM2 HAJEM-A 11.1.2 Display Printed Circuit Board CN-DISP...

  • Page 24: Installation Instruction

    12. Installation Instruction 12.1 Indoor Unit Required Materials 12.1.1 Indoor Installation Diagram  Read the catalog and other technical materials and prepare the required materials.  Installation parts you Applicable piping kit should purchase ( ) Sleeve ( ) Piping size Bushing-Sleeve ( ) Applicable piping kit Putty (Gum Type...
  • Page 25 12.1.2 Selecting the Location for the Indoor Unit Provide a check port on the piping side ceiling for repair and maintenance.  Install the indoor unit once the following conditions are satisfied and after receiving the customer approval. The indoor unit must be within a maintenance space. The indoor unit must be free from any obstacles in path of the air inlet and outlet, and must allow spreading of air throughout the room.
  • Page 26 12.1.3 Installation of Indoor Unit This air conditioner uses a drain up motor. (Unit: mm) 650 (Ceiling opening) Drain pipe Horizontally install the unit using a level gauge. (Hanging bolt) CEILING OPENING DIMENSIONS AND HANGING BOLT LOCATION The paper model for installation expand or shrink 580 (Unit size) according to temperature and humidity.
  • Page 27 Do not overtighten, overtightening may cause gas leakage. Vacuum drying Piping size Torque After completing the piping connection, execute 6.35 mm (1/4") [18 N•m (1.8 kgf•cm)] vacuum drying for the connecting piping and the indoor unit. 9.52 mm (3/8") [42 N•m (4.3 kgf•cm)] The vacuum drying must be carried out by using the 12.7 mm (1/2") [55 N•m (5.6 kgf•cm)]...
  • Page 28 12.1.6 Heat Insulation Be sure to perform heat insulation on the drain, liquid and gas piping. Imperfection in heat insulation Caution work leads to water leakage. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C). Hose clip (Accessory) Overlap with heat insulator for piping.
  • Page 29 12.1.7.1 Wire Stripping and Connection Requirement Conductor not Conductor Conductor Wire stripping fully inserted Indoor/outdoor fully inserted over inserted connection terminal board 5 mm or more No loose strand when inserted ACCEPT PROHIBITED PROHIBITED (gap between wires) RISK OF FIRE JOINING OF WIRES M AY CAUSE WARNING OVERHE ATING AND FIRE.
  • Page 30 Fit the decorative panel and ceiling wall together and confirm no gap in between. Readjust indoor unit height, if there is a gap between ceiling wall and decorative panel. Good example Bad example Air conditioner Air conditioner unit Cool air leakage unit (no good) Ceiling...
  • Page 31 12.1.9.3 Connecting The Piping to Outdoor Multi Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (locate at valve) onto the copper pipe. Align center of piping to valve and then tighten with torque wrench to the specified torque as stated in the table.

  • Page 32: 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 33 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 34: 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 35 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 36 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 37 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 38: 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 39: 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 40: 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 41 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 42 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 43 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 44: 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 45 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 46 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 47 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 48 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 49 (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 50: 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 51 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 52: 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 53: 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 54: 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 55: Quiet Operation (Cooling Mode/Cooling Area Of Dry Mode)

    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  When “QUIET” button at remote control is pressed twice. QUIET LED illuminates. Quiet operation stop condition ...

  • Page 56: Auto Restart Control

    14.7.1 ON Timer Control  ON timer 1 and ON timer 2 can be set using remote control, the unit with timer set will start operate earlier than the setting time. This is to provide a comfortable environment when reaching the set ON time. ...

  • Page 57: Ha Terminal (Hajem-A)

    14.11 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 58: 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 59: 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 60: 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 61: 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 62 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 63 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 64: 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 65 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 66: 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 67: 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 68 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 Outdoor high High pressure sensor open...

  • Page 69: 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 70 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 71 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 72 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 73 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 74 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 75 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 76 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 77 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 78 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 79 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 80 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 81 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 82 17.4.14 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 83 17.4.15 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 84 17.4.16 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 85 17.4.17 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 86 17.4.18 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 87 17.4.19 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 88 17.4.20 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 89 17.4.21 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 90 17.4.22 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 91 17.4.23 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...
  • Page 92 17.4.24 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 93 17.4.25 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 94 17.4.26 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 95 17.4.27 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 96 17.4.28 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 97: 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 Disassembly of Parts Front Grille Intake Grille...
  • Page 98 Hooks To remove the Electronic Controller, release the 6 hooks that hold it to the Control Board (Fig. 4). Electronic Controller Fig. 4 Remove the Front Grille by removing the Screw B Front Grille Screw C screw A and screws B, C & D half way open (Fig.
  • Page 99 Remove the Fan Motor by release the Fan Motor lead wire connectors and Fan Motor screws (Fig. 8). Screws Connectors Fig. 8...

  • Page 100: Exploded View And Replacement Parts List

    19. Exploded View and Replacement Parts List 19.1 Indoor Unit...
  • Page 101 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 102 SAFETY REF. NO. PARTS NAME & DESCRIPTION QTY. CS-MZ20UB4EA REMARK BASE PAN ASS’Y CWD52K1100 INNER POLYSTYRENE COMPLETE CWG07C1047 CABINET SIDE PLATE ASS’Y CWE041121 CABINET SIDE PLATE ASS’Y CWE041122 LEAD WIRE - FAN MOTOR CWA67C5136 FAN MOTOR EHDS50A40AC ANTI - VIBRATION BUSHING...
  • Page 103 SAFETY REF. NO. PARTS NAME & DESCRIPTION QTY. CS-MZ20UB4EA REMARK INSTALLATION INSTRUCTION ACXF60-26400 INSTALLATION INSTRUCTION ACXF60-26410 INSTALLATION INSTRUCTION ACXF60-26420 INSTALLATION INSTRUCTION ACXF60-26430 INSTALLATION INSTRUCTION ACXF60-26440 INSTALLATION INSTRUCTION ACXF60-26450 INSTALLATION INSTRUCTION ACXF60-26460 INSTALLATION INSTRUCTION ACXF60-26470 INSTALLATION INSTRUCTION ACXF60-26480 INSTALLATION INSTRUCTION ACXF60-26490...

  • Page 104: Bt20Ew (Front Grille Complete)

    19.2 CZ-BT20EW (Front Grille Complete) 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 105 SAFETY REF. NO. PARTS NAME & DESCRIPTION QTY. CZ-BT20EW REMARK FRONT GRILLE - COMPLETE ACXE10C07740 A.S MOTOR DC SINGLE 12V 250 OHM CWA981105J BRACKET - A.S.MOTOR CWD932522 VANE CWE241159A SHAFT CWH631038 SHAFT CWH631045 CONNECTOR - SHAFT CWH081007 BEARING CWH641008 PLATE COVER FOR A.S.MOTOR CWD911459 PLATE COVER FOR CONNECTING SHAFT CWD911460...

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