Panasonic CS-ME7QKUA Service Manual
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Panasonic CS-ME7QKUA Service Manual

Indoor unit
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Order No: PAPAMY1312045CE
Indoor Unit
CS-ME7QKUA
Destination
U.S.A.
Canada
Please file and use this manual together with the service manual for Model No. CU-5E36QBU, Order No. PAPAMY1312037CE.
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the products dealt with in this service information by anyone else could result in serious injury or death.
PRECAUTION OF LOW TEMPERATURE
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
© Panasonic Corporation 2013

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Summary of Contents for Panasonic CS-ME7QKUA

  • Page 1 PRECAUTION OF LOW TEMPERATURE In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit. © Panasonic Corporation 2013...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 15.4 Self-diagnosis Method ........36 1. Safety Precautions ..........3 16. Disassembly and Assembly Instructions ..63 2. Specification ............5 16.1 Indoor Electronic Controllers, 3. Features ............... 7 Cross Flow Fan and Indoor Fan Motor Removal Procedures ........63 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 19. During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration piping and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.). 20.

  • Page 5: Specification

    2. Specification Indoor CS-ME7QKUA Model Outdoor CU-5E36QBU Performance Test Condition Phase, Hz Single, 60 Power Supply Min. Mid. Max. Min. Mid. Max. 1.80 2.01 2.90 1.80 2.01 2.90 Capacity BTU/h 6100 6900 9900 6100 6900 9900 Running Current Input Power 5.29...
  • Page 6 Indoor CS-ME7QKUA Model Outdoor CU-5E36QBU Inner Diameter mm (inch) 16.7 (5/8) Drain Hose Length mm (inch) 650 (25-5/8) Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Row x Stage x Exchanger 2 x 15 x 21 Size (W x H x L) mm (inch) 25.4 x 315 x 610 (1 x 12-3/8 x 24)

  • Page 7: Features

    3. Features  Inverter Technology Wider output power range Energy saving Quick Cooling More precise temperature control  Environment Protection Non-ozone depletion substances refrigerant (R410A)  Long Installation Piping Long piping up to 82 ft (25 meters) for 1 room ...

  • Page 8: Location Of Controls And Components

    4. Location of Controls and Components Indoor Unit Outdoor Unit Remote Control...

  • Page 9: Dimensions

    5. Dimensions Indoor Unit...

  • Page 10: Refrigeration Cycle Diagram

    6. Refrigeration Cycle Diagram...

  • Page 11: Block Diagram

    7. Block Diagram...

  • Page 12: Wiring Connection Diagram

    8. Wiring Connection Diagram Indoor Unit...

  • Page 13: Electronic Circuit Diagram

    9. Electronic Circuit Diagram Indoor Unit...

  • Page 14: Printed Circuit Board

    10. Printed Circuit Board 10.1 Indoor Unit 10.1.1 Main Printed Circuit Board...
  • Page 15 10.1.2 Power Printed Circuit Board 10.1.3 Indicator Printed Circuit Board...

  • Page 16: Installation Instruction

    11. Installation Instruction 11.1 Select the Best Location 11.1.2 Indoor/Outdoor Unit Installation Diagram 11.1.1 Indoor Unit  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 near the unit.

  • Page 17: Indoor Unit

    11.2 Indoor Unit 11.2.1 How to Fix Installation Plate The mounting wall shall be strong and solid enough to prevent it from the vibration. The center of installation plate should be at more than  at right and left of the wall. The distance from installation plate edge to ceiling should more than .
  • Page 18 11.2.3 Indoor Unit Installation 11.2.3.1 For the right rear piping 11.2.3.2 For the right bottom piping 11.2.3.3 For the embedded piping (This can be used for left rear piping and bottom piping also.)

  • Page 19: Connect The Cable To The Indoor Unit

    11.2.4 Connect the Cable to the Indoor Unit 1. The inside and outside connection cable can be connected without removing the front grille. 2. Unscrew the conduit cover and fix the conduit connector to conduit cover with lock nut, then secure it against chassis.
  • Page 20 11.2.5 Wiring Stripping and connecting requirement 11.2.5.1 Cutting and flaring the piping Please cut using pipe cutter and then remove the burrs. Remove the burrs by using reamer. If burrs are not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe.

  • Page 21: Operation Control

    12. Operation Control 12.1 Basic Function Inverter control, which equipped with a microcomputer in determining the most suitable operation mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operation mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting.

  • Page 22: Indoor Fan Motor Operation

    12.1.4.2 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 23: Outdoor Fan Motor Operation

    [Heating] According to indoor pipe temperature, automatic heating fan speed is determined as follows.  Feedback control Immediately after the fan motor started, feedback control is performed once every second. During fan motor on, if fan motor feedback ≥ 2550 rpm or < 50 rpm continue for 10 seconds, then fan motor error counter increase, fan motor is then stop and restart.

  • Page 24: Quiet Operation (Cooling Mode/Cooling Area Of Dry Mode)

    12.4.2 Horizontal Airflow The horizontal airflow direction louvers can be adjusted manually by hand. 12.5 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 25: Powerful Mode Operation

     Control contents Fan speed auto  Indoor FM RPM depends on pipe temperature sensor of indoor heat exchanger. Auto fan speed is changed from normal setting to quiet setting of respective fan speed. This is to reduce sound of Hi, Me, Lo for 3dB.

  • Page 26: Indication Panel

    12.10 Indication Panel Note:  If POWER LED is blinking, the possible operation of the unit are Hot Start, during Deice operation, operation mode judgment, or ON timer sampling.  If Timer LED is blinking, there is an abnormality operation occurs.

  • Page 27: Operation Control (For Multi Split Connection)

    13. 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. 13.1 Cooling operation 13.1.1 Thermostat control  Capability supply to indoor unit is OFF (Expansion valve closed) when Intake Air Temperature — Internal setting temperature <...

  • Page 28: Indoor Fan Motor Operation

     For the 2nd judgment onwards If indoor intake temperature - remote control setting temperature  5.4°F, if previous operate in DRY mode, then continue in DRY mode, otherwise COOL mode is decided. If -3.6°F ≤ indoor intake temperature - remote control setting temperature < 5.4°F, maintain with previous mode.

  • Page 29: Servicing Mode

    14. Servicing Mode 14.1 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 30: 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 16 seconds to identify the Remote Control Receiving Sound OFF/ON Mode is in standby condition) and press “AC Reset”...

  • Page 31: Troubleshooting Guide

    15. Troubleshooting Guide 15.1 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 (°F) power source, malfunction of a compressor and a fan.
  • Page 32 15.1.1 Relationship between the condition of the air conditioner and pressure and electric current  Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.

  • Page 33: Breakdown Self Diagnosis Function

    15.2 Breakdown Self Diagnosis Function 15.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code)  Once error occurred during operation, the unit will stop its operation, and Timer LED blinks.  Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown condition, the LED will ON again.

  • Page 34: Error Code Table

    15.3 Error Code Table...
  • Page 35 Note: “○” – Frequency measured and fan speed fixed The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep” sound heard following by pressing the CHECK button at remote control. Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Code Table) by using remote control or Auto OFF/ON button at indoor unit.

  • Page 36: Self-Diagnosis Method

    15.4 Self-diagnosis Method 15.4.1 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 37 15.4.2 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 38 15.4.3 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 39 15.4.4 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 40 15.4.5 H16 (Outdoor Current Transformer Open Circuit) Malfunction Decision Conditions  A current transformer (CT) is detected by checking the compressor running frequency (≥ rated frequency) and CT detected input current (less than 0.65A) for continuously 20 seconds. Malfunction Caused ...
  • Page 41 15.4.6 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 > 2550rpm or < 50rpm) Malfunction Caused ...
  • Page 42 15.4.7 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 43 15.4.8 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 44 15.4.9 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 45 15.4.10 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 46 15.4.11 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 47 15.4.12 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 48 15.4.13 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 49 15.4.14 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 50 15.4.15 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 51 15.4.16 H98 (Indoor High Pressure Protection) Error Code will not display (no Timer LED blinking) but store in EEPROM Malfunction Decision Conditions  During heating operation, the temperature detected by the indoor pipe temperature sensor is above 140°F. Malfunction Caused ...
  • Page 52 15.4.17 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry) Malfunction Decision Conditions  Freeze prevention control takes place (when indoor pipe temperature is lower than 35.6°F) Malfunction Caused  Clogged air filter of the indoor unit  Dust accumulation on the indoor unit heat exchanger ...
  • Page 53 15.4.18 F11 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  When cooling operation, when indoor pipe temperature or indoor heat exchanger temperature sensor is above 113°F. Malfunction Caused  Faulty connector connection.  Faulty indoor pipe temperature sensor.  Faulty indoor main PCB.
  • Page 54 15.4.19 F17 (Indoor Standby Units Freezing Abnormality) Malfunction Decision Conditions  When the different between indoor intake air temperature and indoor pipe temperature is above 50°F or indoor pipe temperature is below 30.2°F 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 55 15.4.20 F90 (Power Factor Correction Protection) Malfunction Decision Conditions  During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level. Malfunction Caused  DC voltage peak due to power supply surge.
  • Page 56 15.4.21 F91 (Refrigeration Cycle Abnormality) Malfunction Decision Conditions  During cooling, compressor frequency = Fcmax.  During cooling and heating operation, running current: 0.65A < I < 1.65A.  During cooling, indoor intake - indoor pipe < 39.2°F. Malfunction Caused ...
  • Page 57 15.4.22 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  Outdoor PCB malfunction Troubleshooting...
  • Page 58 15.4.23 F95 (Cooling High Pressure Abnormality) Malfunction Decision Conditions During operation of cooling, when outdoor unit heat exchanger high temperature data (141.8°F) is detected by the outdoor pipe temperature sensor. Malfunction Caused  Outdoor pipe temperature rise due to short circuit of hot discharge air flow. ...
  • Page 59 15.4.24 F96 (IPM Overheating) Malfunction Decision Conditions During operating of cooling and heating, when IPM temperature data (212°F) is detected by the IPM temperature sensor. Malfunction Caused  IPM overheats due to short circuit of hot discharge air flow.  IPM overheats due to defective of outdoor fan motor.
  • Page 60 15.4.25 F97 (Compressor Overheating) Malfunction Decision Conditions During operation of cooling and heating, when compressor tank temperature data (233.6°F) is detected by the compressor tank temperature sensor. Malfunction Caused  Refrigerant shortage (refrigerant leakage).  2/3 way valve closed.  Detection error due to faulty compressor tank temperature sensor.
  • Page 61 15.4.26 F98 (Input Over Current Detection) Malfunction Decision Conditions During cooling and heating operation, when an input over-current (16.8A) is detected by checking the input current value being detected by current transformer (CT) with the compressor running. Malfunction Caused  Over-current due to compressor failure.

  • Page 62: Troubleshooting

    15.4.27 F99 (Output Over Current Detection) Malfunction Decision Conditions During operation of cooling and heating, when an output over-current (18.5A) is detected by checking the current that flows in the inverter DC peak sensing circuitry. Malfunction Caused  DC peak due to compressor failure. ...

  • Page 63: Disassembly And Assembly Instructions

    16. 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. 16.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor Removal Procedures 16.1.1...
  • Page 64 16.1.1.2 To remove discharge grille...
  • Page 65 16.1.1.3 To remove control board 16.1.1.4 To remove cross flow fan and indoor fan motor...

  • Page 67: List

    17. Exploded View and Replacement Parts List 17.1 Indoor 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 68 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CS-ME7QKUA REMARK CHASSIS COMPLETE CWD50C1633 FAN MOTOR L6CBYYYL0055 CROSS-FLOW FAN COMPLETE CWH02C1076 BEARING ASSY CWH64K007 SCREW - CROSS-FLOW FAN CWH551146 EVAPORATOR CWB30C3504 FLARE NUT (LIQUID) CWT251030 FLARE NUT (GAS) CWT251031 CONTROL BOARD CASING...

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