Panasonic CS-MRE7PKE Service Manual
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Panasonic CS-MRE7PKE Service Manual

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This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
CS-MRE7PKE
CS-MRE9PKE
CS-MRE12PKE
WARNING
PRECAUTION OF LOW TEMPERATURE
Order No: PAPAMY1301063CE

Air Conditioner

Indoor Unit
© Panasonic Corporation 2013
Outdoor Unit
CU-2RE15PBE
CU-2RE18PBE
Destination
Europe

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Summary of Contents for Panasonic CS-MRE7PKE

  • Page 1: Air Conditioner

    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

    1. Safety Precautions ..........3 15.2 Dew Prevention control (Cool) ....44 15.3 Electronic Parts Temperature Rise 2. Specifications ............. 5 Protection 1 (Cool) ........44 CS-MRE7PKE CS-MRE9PKE 15.4 Electronic Parts Temperature Rise CS-MRE12PKE ..........5 Protection 2 (Cool) ........44 CU-2RE15PBE ..........9 15.5 Cooling overload control (Cool) ....45...

  • 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. The caution items stated here must be followed because these important contents are related to safety.
  • Page 4 WARNING 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: Specifications

    2. Specifications CS-MRE7PKE CS-MRE9PKE CS-MRE12PKE MODEL INDOOR CS-MRE7PKE CS-MRE9PKE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. Min. Mid. Max. 1.10 2.00 2.50 1.10 2.50 3.10 Capacity BTU/h 3750 6820 8530 3750 8530 10600 Running Current 2.60...
  • Page 6 MODEL INDOOR CS-MRE7PKE CS-MRE9PKE Height (I/D) mm (inch) 290 (11-7/16) Dimension Width (I/D) mm (inch) 870 (34-9/32) Depth (I/D) mm (inch) 214 (8-7/16) Weight Net (I/D) kg (lb) 9 (20) Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) 6.35 (1/4) / 9.52 (3/8)
  • Page 7 MODEL INDOOR CS-MRE12PKE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.10 3.20 3.70 Capacity BTU/h 3750 10900 12600 Running Current 4.60 Input Power 1.21k Annual Consumption 4.78 3.27 3.06 dB-A 44 / 32 Indoor Noise (H / L) Power Level dB 60 / - 0.70...
  • Page 8 MODEL INDOOR CS-MRE12PKE 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 Slit Fin Indoor Heat Row x Stage x Exchanger 2 x 15 x 21 Size (W x H x L) 610 x 315 x 25.4 Material...

  • Page 9: Cu-2Re15Pbe

    CU-2RE15PBE Item Unit OUTDOOR UNIT Indoor Unit Combination 2.0kW + 2.5kW Power Source 1 Phase, 230V, 50Hz (Power supply from outdoor unit) 4.4 (1.5 ~ 4.8) Capacity BTU/h 15000 (5120 ~ 16400) Running Current 6.10 Power Input 1.30 (0.27 ~ 1.52) Electrical Cooling Operation 3.38 (5.56 ~ 3.16)
  • Page 10 Item Unit OUTDOOR UNIT Dry Bulb Wet Bulb Maximum °C Cooling Minimum °C Indoor Operation Range Maximum °C — Heating Minimum °C — Maximum °C Cooling Minimum °C Outdoor Operation Range Maximum °C Heating Minimum °C Note Specifications are subject to change without notice for further improvement.

  • Page 11: Cu-2Re18Pbe

    CU-2RE18PBE Item Unit OUTDOOR UNIT Indoor Unit Combination 2.5kW + 2.5kW Power Source 1 Phase, 230V, 50Hz (Power supply from outdoor unit) 4.8 (1.5 ~ 5.0) Capacity BTU/h 16400 (5120 ~ 17100) Running Current 6.95 Power Input 1.49 (0.27 ~ 1.58) Electrical Cooling Operation 3.22 (5.56 ~ 3.16)
  • Page 12 Item Unit OUTDOOR UNIT Dry Bulb Wet Bulb Maximum °C Cooling Minimum °C Indoor Operation Range Maximum °C — Heating Minimum °C — Maximum °C Cooling Minimum °C Outdoor Operation Range Maximum °C Heating Minimum °C Note Specifications are subject to change without notice for further improvement.
  • Page 13 Multi Split Combination Possibility: A single outdoor unit enables air conditioning of up to two separate rooms for CU-2RE15PBE, CU-2RE18PBE. Indoor Unit : CS-MRE7/9/12PKE Outdoor Unit : CU-2RE15PBE 2 Room 1 Room Indoor Unit Capacity (kW) Total Indoor Capacity (kW) Indoor Unit Capacity (kW) Total Indoor Capacity (kW) 20 + 20...

  • Page 14: Features

    Features Inverter Technology Wider output power range Energy saving Quick Cooling Quick Heating More precise temperature control Environment Protection Non-ozone depletion substances refrigerant (R410A) Long Installation Piping Long piping up to 15 meters (0.75 ~ 1.75HP) during single split connection only Easy to use remote control Quality Improvement Random auto restart after power failure for safety restart operation...

  • Page 15: Location Of Controls And Components

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

  • Page 16: Dimensions

    5. Dimensions Indoor Unit...

  • Page 17: Outdoor Unit

    Outdoor Unit...

  • Page 18: Refrigeration Cycle Diagram

    6. Refrigeration Cycle Diagram...

  • Page 19: Block Diagram

    7. Block Diagram Indoor Unit...

  • Page 20: Outdoor Unit

    Outdoor Unit...

  • Page 21: Wiring Connection Diagram

    8. Wiring Connection Diagram Indoor Unit...

  • Page 22: Outdoor Unit

    Outdoor Unit...

  • Page 23: Electronic Circuit Diagram

    9. Electronic Circuit Diagram Indoor Unit...

  • Page 24: Outdoor Unit

    Outdoor Unit...

  • Page 25: Printed Circuit Board

    10. Printed Circuit Board 10.1 Indoor Unit 10.1.1 Main Printed Circuit Board 10.1.2 Indicator and Receiver Printed Circuit Board...

  • Page 26: Outdoor Unit

    10.2 Outdoor Unit...

  • Page 27: Installation Information

    11. Installation Information 11.1 CU-2RE15PBE 11.1.1 Check Points 11.1.2 The Shapes of the 3-Way Valve Caps of the Outdoor Unit Have Been Changed Accompanying the changes in the shapes of the 3-way valve caps, the tightening method has also been changed. Firmly tighten the 3-way valve caps by hand, and then tighten them up by another 30 degrees or so (one-twelfth of a full turn) using a spanner or adjustable spanner.

  • Page 28: Cu-2Re18Pbe

    11.2 CU-2RE18PBE 11.2.1 Check Points 11.2.2 The Shapes of the 3-Way Valve Caps of the Outdoor Unit Have Been Changed Accompanying the changes in the shapes of the 3-way valve caps, the tightening method has also been changed. Firmly tighten the 3-way valve caps by hand, and then tighten them up by another 30 degrees or so (one-twelfth of a full turn) using a spanner or adjustable spanner.

  • Page 29: Installation Instruction

    12. Installation Instruction 12.1 Select the Best Location 12.1.3 Indoor/Outdoor Unit Installation Diagram 12.1.1 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 30: Indoor Unit

    12.2 Indoor Unit 12.2.1 How to Fix Installation Plate 12.2.2 To Drill a Hole in the Wall and The mounting wall is strong and solid enough to Install a Sleeve of Piping prevent it from the vibration. Insert the piping sleeve to the hole. Fix the bushing to the sleeve.
  • Page 31 12.2.3.1 For the right rear piping 12.2.3.2 For the right and right bottom piping 12.2.3.3 For the embedded piping (This can be used for left rear piping and bottom piping also.)

  • Page 32: Connect The Cable To The Indoor Unit

    12.2.4 Connect the Cable to the Indoor Unit The inside and outside connection cable can be connected without removing the front grille. Connection cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 x 1.5 mm flexible cord, type designation 60245 IEC 57 or heavier cord.
  • Page 33 CUTTING AND FLARING THE PIPING Please cut using pipe cutter and then remove the burrs. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe. Please make flare after inserting the flare nut onto the copper pipes.

  • Page 34: Outdoor Unit

    12.3 Outdoor Unit 12.3.1 Install the Outdoor Unit After selecting the best location, start installation according to Indoor/Outdoor Unit Installation Diagram. Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10 mm). When installing at roof, please consider strong wind and earthquake.

  • Page 35: Evacuation Of The Equipment

    12.3.3 Evacuation of the Equipment WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure. Connect a charging hose with a push pin to the Low and High side of a charging set and the service port of the 3-way valve.

  • Page 36: Piping Insulation

    Connect the power supply cord and connection cable between indoor unit and outdoor unit according to the diagram as shown. Secure the power supply cord and connection cables onto the control board with the holder. Attach the control board cover back to the original position with screw. For wire stripping and connection requirement, refer to instruction 11.2.4 of indoor unit.

  • Page 37: Operation And Control

    13. Operation and Control 13.1 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 38: Indoor Fan Motor Operation

    13.1.4.2 Heating Temperature Sampling Control Temperature sampling is controlled by outdoor unit where room temperature for all power supply ON indoor unit could be obtained. When capability supply to the indoor unit is OFF and the compressor is ON, the indoor fan motor is stopped. During this condition, 15 seconds after sampling signal from outdoor unit is received, the indoor fan start operation at pre-determined fan speed.

  • Page 39: Indoor Fan Motor Operation

    [Heating] According to indoor pipe temperature, automatic heating fan speed is determined as follows. B. 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 40: Timer Control

    13.4.2 Horizontal Airflow The horizontal airflow direction louvers can be adjusted manually by hand. 13.5 Timer Control 13.5.1 ON Timer Control ON timer 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 41: Operation Control

    14. Operation Control 14.1 Cooling Operation 14.1.1 Outdoor fan control When cooling operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below: 14.1.2 Annual Cooling control This control is to enable cooling operation when outdoor ambient temperature is low. Control start conditions: Cooling operation is activated with compressor ON.

  • Page 42: Heating Operation

    14.2 Heating Operation 14.2.1 Outdoor fan control When heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below for Heating overload control: 14.2.2 Heating Room Temp Sampling Control To improve the judgment accuracy, indoor room temperature sampling starts when any indoor unit has stopped capability supplied (heating thermo-off) during heating operation with compressor ON, outdoor unit will send signal to all thermo-off indoor units to ON fan motor and get room temperature sample.
  • Page 43 Control Contents Compressor frequency and outdoor fan speed maximum limit is set. Adjust accordingly. Compressor frequency Outdoor fan speed Cool/Quiet #30 Hz #400 rpm Cancel Condition Indoor fan speed is equal or higher than Lo fan. > 1 operation indoor unit. In any cooling overload zone.

  • Page 44: Protection Control

    15. Protection Control 15.1 Freeze Prevention control (Cool) When received freeze prevention signal from indoor unit, the compressor frequency changes according to indoor heat exchanger temperature. When indoor unit request capability OFF due to freeze condition, immediately the capability supply to targeted indoor unit stops.

  • Page 45: Cooling Overload Control (Cool)

    15.5 Cooling overload control (Cool) This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation. 15.6 Heating overload control (Heat) This control detect indoor pipe temperature and perform the compressor frequency restriction during heating operation. This control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation.

  • Page 46: Deice Control

    15.8 Deice Control When outdoor pipe temperature and outdoor air temperature is low, deice operation starts where indoor fan motor and outdoor fan motor stop, indoor unit horizontal vane close and operation LED blink with compressor ON. 15.9 Time Delay Safety Control (Restart Control) The compressor will not restart within three minutes after compressor is stopped.

  • Page 47: Compressor Protection Control (Gas Leak Detection Control 1)

    15.13 Compressor Protection Control (Gas leak detection control 1) Control start conditions For 5 minutes, the compressor continuously operates and total current is low. During Cooling or Soft Dry operation: Indoor intake temperature — indoor piping temperature is below 4°C. During Heating operation: Indoor pipe temperature —...

  • Page 48: Servicing Mode

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

  • Page 49: 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 50: 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 Such problems include insufficient insulation, problem with the MPa (kg/cm temperature (°C) power source, malfunction of a compressor and a fan.
  • Page 51 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 (gas leakage) Clogged capillary tube or Strainer...

  • Page 52: Breakdown Self Diagnosis Function

    17.2 Breakdown Self Diagnosis Function 17.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code) Every press of the button (up or down) will Once abnormality has occurred during operation, increase abnormality numbers and transmit the unit will stop its operation, and Timer LED abnormality code signal to the main unit.

  • Page 53: Self Diagnosis Function

    17.3 Self Diagnosis Function...

  • Page 55: 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. Faulty outdoor unit PCB.
  • Page 56 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. Indoor unit or outdoor unit PCBs defective. Indoor-outdoor unit signal transmission error due to wrong wiring.
  • Page 57 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. Faulty sensor.
  • Page 58 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. Faulty PCB. Troubleshooting...
  • Page 59 17.4.5 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 CT defective Outdoor PCB defective Compressor defective (low compression) Troubleshooting...
  • Page 60 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 > 2550rpm or < 50rpm) Malfunction Caused Operation stops due to short circuit inside the fan motor winding.
  • Page 61 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. Faulty sensor. Faulty PCB.
  • Page 62 17.4.8 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. Faulty sensor. Faulty PCB.
  • Page 63 17.4.9 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. Faulty sensor. Faulty PCB.
  • Page 64 17.4.10 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. Faulty sensor.
  • Page 65 17.4.11 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. Troubleshooting...
  • Page 66 17.4.12 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. Faulty sensor. Faulty PCB.
  • Page 67 17.4.13 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. Operation stops due to breaking of wire inside the fan motor.
  • Page 68 17.4.14 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 60°C. Malfunction Caused Air short circuit at indoor unit Clogged indoor unit air filter Dust accumulation on the indoor unit heat exchanger 2/3 way valve closed...
  • Page 69 17.4.15 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 Air short circuit at indoor unit Clogged indoor unit air filter Dust accumulation on the indoor unit heat exchanger...
  • Page 70 17.4.16 F11 (4-way valve Abnormality) Malfunction Decision Conditions When heating operation, when indoor pipe temperature is below 10°C When cooling operation, when indoor pipe temperature is above 45°C Malfunction Caused Connector in poor contact Faulty sensor Faulty outdoor unit PCB 4-way valve defective Troubleshooting...
  • Page 71 17.4.17 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 72 17.4.18 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. DC voltage peak due to compressor windings not uniform.
  • Page 73 17.4.19 F91 (Refrigeration Cycle Abnormality) Malfunction Caused Faulty indoor intake air or pipe temperature sensor 2/3 way valve closed Refrigerant shortage (refrigerant leakage) Clogged expansion valve or strainer Faulty outdoor unit Poor compression of compressor Troubleshooting...
  • Page 74 17.4.20 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 75 17.4.21 F95 (Cooling High Pressure Abnormality) Malfunction Decision Conditions During operation of cooling, when outdoor unit heat exchanger high temperature data (61°C) is detected by the outdoor pipe temperature sensor. Malfunction Caused Air short circuit at indoor unit Dust accumulation on the indoor unit heat exchanger 2/3 way valve closed Faulty outdoor unit fan motor Excessive refrigerant...
  • Page 76 17.4.22 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 77 17.4.23 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 Refrigerant shortage (refrigerant leakage) Faulty outdoor unit PCB Faulty compressor Troubleshooting...
  • Page 78 17.4.24 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 79: Troubleshooting

    17.4.25 F99 (Output Over Current Detection) Malfunction Decision Conditions During operation of cooling and heating, when an output over-current (DC peak current value at IPM Prevention Control) is detected by checking the current that flows in the inverter DC peak sensing circuitry. Malfunction Caused Faulty outdoor unit PCB Faulty compressor...

  • Page 80: Disassembly And Assembly Instructions

    18. Disassembly and Assembly Instructions WARNING High voltages are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks. 18.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor Removal Procedures 18.1.1...
  • Page 81 Figure 3 Figure 4 18.1.3 To remove discharge grille 10. Pull out to remove the drain hose from the discharge grille 11. Then pull the discharge grille downward gently to dismantle it Figure 5...

  • Page 82: To Remove Cross Flow Fan And Indoor Fan Motor

    18.1.4 To remove control board 12. Remove 4 screws holding the control board then pull out the control board. Figure 6 18.1.5 To remove cross flow fan and indoor fan motor 13. Remove the screw that holding the cross flow fan and fan motor axis.
  • Page 83 16. Push the holdfast to the left and lift up the evaporator. Evaporator 17. Remove the cross flow fan from the unit by 18. Fan motor can be removed after the pulling it to the left and downward. removal of cross flow fan. Reminder: To reinstall the fan motor, adjust the fan motor connector to 45°...

  • Page 84: Outdoor Unit Removal Procedure

    18.2 Outdoor Unit Removal Procedure Caution! When handling electronic controller, be careful of electrostatic discharge. 18.2.1 Removing the Cabinet Top Plate and Cabinet Front Plate Remove the cabinet top plate (by removing the 5 screws). Remove the 8 screws fixing the cabinet front plate, release 6 hooks and pull the cabinet front plate toward front side.
  • Page 85 18.2.4 Removing the Propeller Fan and Fan Motor Remove the cabinet top plate and cabinet front plate. Remove the propeller fan by removing the nut turning clockwise at its center. Disconnect the connector of the fan motor from the control board. Loosen the 4 screws at the fan motor mounting then remove the fan motor.

  • Page 86: Technical Data

    19. Technical Data 19.1 Operation Characteristics (CU-2RE15PBE) 19.1.1 One Indoor Unit Operation 19.1.1.1 CS-MRE7PKE...
  • Page 88 19.1.1.2 CS-MRE9PKE...
  • Page 90 19.1.2 Two Indoor Unit Operation 19.1.2.1 CS-MRE7PKE x2...
  • Page 92 19.1.2.2 CS-MRE9PKE + CS-MRE7PKE...

  • Page 94: Operation Characteristics (Cu-2Re18Pbe)

    19.2 Operation Characteristics (CU-2RE18PBE) 19.2.1 One Indoor Unit Operation 19.2.1.1 CS-MRE7PKE...
  • Page 96 19.2.1.2 CS-MRE9PKE...
  • Page 98 19.2.1.3 CS-MRE12PKE...
  • Page 100 19.2.2 Two Indoor Unit Operation 19.2.2.1 CS-MRE7PKE x2...
  • Page 102 19.2.2.2 CS-MRE9PKE x2...
  • Page 104 19.2.2.3 CS-MRE12PKE x2...

  • Page 106: Exploded View And Replacement Parts List

    20. Exploded View and Replacement Parts List 20.1 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 107 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CS-MRE7PKE CS-MRE9PKE CS-MRE12PKE REMARK CHASSIS COMPLETE CWD50C1653 ← ← FAN MOTOR ARW7628AC ← ← CROSS-FLOW FAN COMPLETE CWH02C1076 ← ← BEARING ASSY CWH64K007 ← ← SCREW - CROSS-FLOW FAN CWH551146 ← ←...

  • Page 108: Outdoor Unit

    20.2 Outdoor Unit Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 109 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CU-2RE15PBE CU-2RE18PBE REMARK CHASSIS ASSY CWD52K1277 ← FAN MOTOR BRACKET CWD541167 ← FAN MOTOR, AC 50W SINGLE ARW6405AC ← SCREW-FAN MOTOR BRACKET CWH551217 ← SCREW-FAN MOTOR MOUNT CWH55252J ← PROPELLER FAN CWH03K1066 ←...
  • Page 110 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CU-2RE15PBE CU-2RE18PBE REMARK OPERATING INSTRUCTION CWF568940 ← INSTALLATION INSTRUCTION CWF615766 ← INSTALLATION INSTRUCTION CWF615767 ← INSTALLATION INSTRUCTION CWF615768 ← INSTALLATION INSTRUCTION CWF615769 ← INSTALLATION INSTRUCTION CWF615770 ← INSTALLATION INSTRUCTION CWF615771 ← INSTALLATION INSTRUCTION CWF615772 ←...

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