Panasonic CS-E12RB4UW Service Manual
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Panasonic CS-E12RB4UW Service Manual

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This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the products dealt with in this service information by anyone else could result in serious injury or death.
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
AUTO
FAN
SPEED
HEAT
COOL
AIR
SW ING
DRY
FAN
O F F/ O N
O F F/ O N
M O D E
T E M P
T E M P
AIR SWING
POWERFUL/
QUIET
FAN SPEED
T IM E R
T IM E R
O N
O N
S E T
S E T
1
1
2
2
3
3
O F F
O F F
C A N C E L
C A N C E L
AC
RC
SET CHECK CLOCK
CHECK
RESET
WARNING
PRECAUTION OF LOW TEMPERATURE
Indoor Unit
CS-E12RB4UW
CS-E18RB4UW
Order No: PAPAMY1503095CE

Air Conditioner

Outdoor Unit
CU-E12RB4U
CU-E18RB4U
Destination
USA
Canada
© Panasonic Corporation 2015

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Summary of Contents for Panasonic CS-E12RB4UW

  • 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 2015...

  • Page 2: Table Of Contents

    16.1 Disassembly of Parts ........85 16.2 Outdoor Electronic Controller Removal 7. Block Diagram ..........16 Procedure ...........88 CS-E12RB4UW CU-E12RB4U ....16 17. Technical Data ..........90 CS-E18RB4UW CU-E18RB4U ....17 17.1 Cool Mode Performance Data ....90 8. Wiring Connection Diagram ......18 17.2...

  • 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 During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of compressor while compressor is operating and valves are opened will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.) After completion of installation or service, confirm there is no leakage or refrigerant gas.

  • Page 5: Specifications

    2. Specifications Indoor CS-E12RB4UW Model Outdoor CU-E12RB4U Performance Test Condition Phase, Hz Single, 60 Power Supply Min. Mid. Max. Min. Mid. Max. 1.20 3.48 3.90 1.20 3.48 3.90 Capacity BTU/h 4100 11900 13300 4100 11900 13300 kcal/h (Frig./h) – –...
  • Page 6 Indoor CS-E12RB4UW Model Outdoor CU-E12RB4U Type BACKWARD FAN Material Motor Type DC / Transistor (8-poles) Input Power – Output Power Cool Heat Cool Heat Cool Speed Heat Cool Heat Cool Heat Type Propeller Fan Material Motor Type DC (8-poles) Input Power –...
  • Page 7 Indoor CS-E12RB4UW Model Outdoor CU-E12RB4U Pipe Diameter (Liquid / Gas) mm (inch) 6.35 (1/4) / 12.70 (1/2) Standard length m (ft) 7.5 (24.6) Length range (min – max) m (ft) 3 (9.8) ~ 20 (65.6) I/D & O/D Height different m (ft) 15.0 (49.2)
  • Page 8 Indoor CS-E18RB4UW Model Outdoor CU-E18RB4U Performance Test Condition Phase, Hz Single, 60 Power Supply Min. Mid. Max. Min. Mid. Max. 1.17 5.13 5.47 1.17 5.13 5.47 Capacity BTU/h 4000 17500 18700 4000 17500 18700 kcal/h (Frig./h) – – – – –...
  • Page 9 Indoor CS-E18RB4UW Model Outdoor CU-E18RB4U Type BACKWARD FAN Material Motor Type DC / Transistor (8-poles) Input Power – Output Power Cool Heat Cool Heat Cool Speed Heat Cool Heat Cool Heat Type Propeller Fan Material Motor Type DC (8-poles) Input Power –...
  • Page 10 Indoor CS-E18RB4UW Model Outdoor CU-E18RB4U Pipe Diameter (Liquid / Gas) mm (inch) 6.35 (1/4) / 12.70 (1/2) Standard length m (ft) 7.5 (24.6) Length range (min – max) m (ft) 3 (9.8) ~ 30.5 (100.0) I/D & O/D Height different m (ft) 15.0 (49.2) Additional Gas Amount...

  • Page 11: Features

     Environment Protection Non-ozone depletion substances refrigerant (R410A)  Long Installation Piping CS-E12RB4UW, CU-E12RB4U long piping up to 20 meters (65.6 ft) CS-E18RB4UW, CU-E18RB4U long piping up to 30.5 meters (100.0 ft)  Easy to use remote control  Quality Improvement...

  • Page 12: Location Of Controls And Components

    4. 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 Outdoor Unit Air inlet (rear) Air inlet (side) Air outlet Remote Control LCD display...

  • Page 13: Dimensions

    5. Dimensions Indoor Unit Air Intel 575 (22-21/32) <Remote Control> 47 (1-17/32) 22 (55/64) A U T O F A N S P E E D H E A T A I R C O O L S W I N G D R Y F A N OFF/ON...

  • Page 14: Outdoor Unit

    Outdoor Unit 5.2.1 CU-E12RB4U <Top View> 67.6 Space necessary for (2-5/8) installation 24.4 (1) 780 (30-23/32) 60.5 (2-3/8) (104.7 570 (22-1/2) 104.9 (4-1/8)) (4-1/8) 10 cm (3-7/8) 10 cm (3-7/8) 100 cm (39-3/8) 2-way valve at Liquid side (High Pressure) Anchor Bolt Pitch 320 (12-5/8) x 570 (22-1/2) 3-way valve at Gas side...

  • Page 15: Refrigeration Cycle Diagram

    6. Refrigeration Cycle Diagram INDOOR OUTDOOR LIQUID MUFFLER/ EXPANSION SIDE STRAINER RECEIVER VALVE PIPE TEMP. 2-WAY SENSOR VALVE PIPE TEMP. SENSOR 1 INTAKE TEMP. TEMP. SENSOR SENSOR PIPE (INLET) TEMP. SENSOR 2 HEAT EXCHANGER HEAT EXCHANGER (EVAPORATOR) (CONDENSER) SIDE 4-WAY VALVE 3-WAY VALVE MUFFLER...

  • Page 16: Block Diagram

    7. Block Diagram CS-E12RB4UW CU-E12RB4U...

  • Page 17: Cs-E18Rb4Uw Cu-E18Rb4U

    CS-E18RB4UW CU-E18RB4U...

  • Page 18: Wiring Connection Diagram

    8. Wiring Connection Diagram Indoor Unit...

  • Page 19: Outdoor Unit

    Outdoor Unit 8.2.1 CU-E12RB4U POWER SUPPLY TO INDOOR UNIT ELECTRO-MAGNETIC YELLOW (YLW) COIL (EXPANSION VALVE) BLUE (BLU) REACTOR RED (RED) TERMINAL BOARD ( BLACK ) (WHITE) (RED) (TRADEMARK) COMPRESSOR TERMINAL DATA ( RED ) RAT2 RAT1 CN–STM COMMUNICATION YLW/GRN THE PARENTHESIZED LETTERS IS (GRY) (GRY) (WHT)
  • Page 20 8.2.2 CU-E18RB4U TO INDOOR UNIT REACTOR SINGLE PHASE POWER SUPPLY AC 208-230V 60Hz TERMINAL TERMINAL 1 2 3 BOARD BOARD YLW/GRN ACL1 COM3 L2-1 L2-O ACN1 ELECTRONIC CONTROLLER (MAIN) (BLACK) (WHITE) (RED) (GRAY) (BLACK) COMPRESSOR CN-COM CN-COM FUSE3 CIRCUIT (RED) U (YELLOW) (YELLOW) (25A, 250V)

  • Page 21: Electronic Circuit Diagram

    9. Electronic Circuit Diagram Indoor Unit TRANSFORMER MOTOR ELECTRONIC CONTROLLER (MAIN) MOTOR HIGH STATIC CN-FM PRESSURE (WHT) (FAN) SW01 CN-T2 CN-STM2 CN-CNT RECTIFICATION CN-T1 (YLW) (WHT) (YLW) (WHT) CIRCUIT CN-STM1 RECTIFICATION RECTIFICATION (WHT) CIRCUIT CIRCUIT SSR02 SSR01 MOTOR G01(GRN) NOISE FILTER IC07 IC05 CIRCUIT...

  • Page 22: Outdoor Unit

    Outdoor Unit 9.2.1 CU-E12RB4U POWER SUPPLY TO INDOOR UNIT ELECTRO-MAGNETIC COIL (EXPANSION VALVE) REACTOR TERMINAL BOARD (BLACK) (WHITE) (RED) CN–STM RAT2 RAT1 1 2 3 4 5 (WHT) (GRY) (GRY) CN–TH DATA ( RED ) AIR TEMP. SENSOR COMMUNICATION (WHT) YLW/GRN 15.0k 15.8k...
  • Page 23 9.2.2 CU-E18RB4U TO INDOOR UNIT REACTOR SINGLE PHASE POWER SUPPLY AC 208-230V 60Hz TERMINAL TERMINAL 1 2 3 BOARD BOARD YLW/GRN ACN1 ACL1 COM3 L2-1 L2-O ELECTRONIC CONTROLLER (MAIN) (BLACK) (RED) (BLACK) (WHITE) (GRAY) CN-COM CN-COM YLW/GRN (YELLOW) (YELLOW) R425 R159 R426 COMPRESSOR...

  • Page 24: Printed Circuit Board

    10. Printed Circuit Board 10.1 Indoor Unit 10.1.1 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...
  • Page 25 10.1.2 Display Printed Circuit Board CN-DISP...

  • Page 26: Outdoor Unit

    10.2 Outdoor Unit 10.2.1 Main Printed Circuit Board 10.2.1.1 CU-E12RB4U AC-BLK AC-WHT DATA CN-DCFM CN-STM CURRENT CN-TANK TRANSFORMER (CT) CN-TH CN-HOT POWER TRANSISTOR (IPM)
  • Page 27 10.2.1.2 CU-E18RB4U CN-EV CN-TH1 CN-TANK CN-COM CN-ACFM CN-HT CN-HOT AC-BLK AC-WHT CURRENT TRANSFORMER (CT) POWER TRANSISTOR (IPM)
  • Page 28 10.2.2 Noise Filter Printed Circuit Board 10.2.2.1 CU-E18RB4U COM3 CN-COM CN-BLK ACL1 ACN1 CN-WHT...

  • Page 29: Installation Instruction

    11. Installation Instruction 11.1 Indoor Unit 11.1.1 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.

  • Page 30: Installation Of Indoor Unit

    11.1.2 Installation of Indoor Unit This air conditioner uses a drain up motor. (Unit: inch (mm)) (650) (Ceiling opening) Drain pipe Horizontally install the unit using a level gauge. (60) (530) (60) CEILING OPENING DIMENSIONS AND HANGING (Hanging bolt) BOLT LOCATION (60) (580) The paper model for installation expand or shrink...

  • Page 31: Vacuum Drying

    Vacuum drying After completing the piping connection, execute vacuum drying for the connecting piping and the indoor unit. The vacuum drying must be carried out by using the service ports of both the liquid and gas side valves. CAUTION Use two wrenches and tighten with regular torque. Do not overtighten, overtightening may cause gas leakage.

  • Page 32: Heat Insulation

    11.1.5 Heat Insulation Be sure to perform heat insulation on the drain, liquid and gas piping. Imperfection in heat insulation work leads to water leakage. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 248°F (120°C)).

  • Page 33: Installation Of Decorative Panel

    11.1.6 Connecting the Cable to the Indoor  Open the control board cover by removing 2 pcs of screw.  Unscrew and open the conduit cover upper case. Remove the plug and fix the conduit connector to conduit cover with lock nut. ...
  • Page 34 Fitting the decorative panel Securing the tentative fixing screw Temporarily secure the fixing screws (3 pcs.) before fitting the decorative panel. Approx. 3/4 (20 mm) (For temporarily securing the front grille.) Place decorative panel on the screws (3 pcs.) before fitting, move decorative panel as illustrated and tighten all the Piping direction...

  • Page 35: Outdoor Unit

    11.2 Outdoor Unit 11.2.1 Select the Best Location  11.2.1.1 Indoor/Outdoor Installation If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat radiation from Diagram the condenser is not obstructed.  There should not be any animal or plant which Installation parts you could be affected by hot air discharged.

  • Page 36: Connect The Piping

    11.2.3 Connect the Piping 11.2.3.1 Connecting the Piping to Indoor Unit Please make flare after inserting flare nut (locate at joint portion of tube assembly) onto the copper pipe. Do not overtighten, overtightening may cause gas leakage (In case of using long piping) Piping size Torque Connect the piping...

  • Page 37: Evacuation Of The Equipment

    11.2.4 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. Liquid side Indoor unit Outdoor unit Two-way valve Close Gas side Three-way valve Close Vacuum pump Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way...

  • Page 38: Pipe Insulation

    Secure the wire onto the control board with the holder (clamp). 10 After completing wiring connections, reattach the particular plate and control board cover (metal and plastic) to the original position with the screws. 11 For wire stripping and connection requirement, refer to instruction 11.1.6 of indoor unit. Terminal Terminal Board...
  • Page 39 11.2.7 Disposal of Outdoor Unit Drain Water  If a drain elbow is used, the unit should be placed on a stand which is taller than 1-3/16" (3 cm).  If the unit is used in an area where temperature falls below 32°F (0°C) for 2 or 3 days in succession, it is recommended not to use a drain elbow, for the drain water freezes and the fan will not rotate.

  • Page 40: Operation Control

    12. Operation Control 12.1 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 41: Indoor Fan Motor Operation

    12.1.5 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 42: Outdoor Fan Motor Operation

    ii Auto Fan Speed [Cooling, Dry]  According to room temperature and setting temperature, indoor fan speed is determined automatically.  When set temperature is not achieved, the indoor fan will operate according to pattern below. [1 pattern : 10 s] Speed Higher Medium...

  • Page 43: Airflow Direction

    12.4 Airflow Direction 1. There is one type of airflow, vertical airflow (directed by horizontal vane). 2. Control of airflow direction can be automatic (angles of direction is determined by operation mode, heat exchanger temperature and intake air temperature) and manual (angles of direction can be adjusted using remote control).

  • Page 44: Quiet Operation (Heating)

    12.6 Quiet Operation (Heating)  Purpose To provide quiet heating operation compare to normal operation.  Control condition Quiet operation start condition  When “POWERFUL/QUIET” button at remote control is pressed. POWERFUL/QUIET LED illuminates. Quiet operation stop condition  When one of the following conditions is satisfied, quiet operation stops: ...

  • Page 45: Auto Restart Control

    12.9 Auto Restart Control  When the power supply is cut off during the operation of air conditioner, the compressor will re-operate within three to four minutes (there are 10 patterns between 2 minutes 58 seconds and 3 minutes 52 seconds to be selected randomly) after power supply resumes.

  • Page 46: Protection Control

    13. Protection Control 13.1 Protection Control For All Operations 13.1.1 Restart Control (Time Delay Safety Control)  The Compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on again by pressing OFF/ON button at remote control within this period. ...
  • Page 47 13.1.4 Compressor Overheating Prevention Control  Instructed frequency for compressor operation will be regulated by compressor top temperature. The changes of frequency are as below.  If compressor top temperature exceeds 107°C (224.6°F), compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking.

  • Page 48: Protection Control For Cooling & Soft Dry Operation

    13.2 Protection Control For Cooling & Soft Dry Operation 13.2.1 Outdoor Air Temperature Control  The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.  This control will begin 1 minute after the compressor starts. ...

  • Page 49: Protection Control For Heating Operation

    13.2.5 Dew Prevention Control 1  To prevent dew formation at indoor unit discharge area.  This control will be activated if: Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled. When Cooling or Dry mode is operated more than 20 minutes or more. ...
  • Page 50 13.3.3 Overload Protection Control  The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown below.  If the heat exchanger temperature exceeds 60°C (140°F), compressor will stop. 60°C (140°F) Frequency Reduce 55°C (131°F) 52°C (125.6°F) Frequency Limited 49°C (120.2°F) 46°C (114.8°F)

  • Page 51: Servicing Mode

    14. Servicing Mode 14.1 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 52: Cooling Only Operation (Single Connection Only, Multi Connection Please Refer To Multi Outdoor Manual)

    Control Receiving Sound Off/On Mode is in standby condition) and press “AC Reset” button at remote control. Press “Auto OFF/ON button” to toggle remote control receiving sound. Short “beep”: Turn OFF remote control receiving sound. Long “beep”: Turn ON remote control receiving sound. After Auto OFF/ON Button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON Mode is restarted.

  • Page 53: Remote Control Button

    14.3 Remote Control Button 14.3.1 SET Button  To check remote control transmission code and store the transmission code to EEPROM: Press “Set” button continuously for 10 seconds by using pointer. Press “Timer Set” button until a “beep” sound is heard as confirmation of transmission code changed. 14.3.2 RESET (RC) ...

  • Page 54: Outdoor Pcb Test Run Operation (For Pump Down/Servicing Purpose)

    14.4 Outdoor PCB Test Run Operation (For Pump Down/Servicing Purpose)  The Test Run operation will be activated by short-circuiting CN-S (Pin 1 and 2) at outdoor unit PCB after power supplied to outdoor unit terminal 1 and 2. The unit forced to run rated frequency cooling operation mode. ...
  • Page 55  CU-E18RB4U CN-EV CN-TH1 CN-TANK CN-S CN-COM CN-ACFM CN-HT CN-HOT AC-BLK AC-WHT CURRENT TRANSFORMER (CT) POWER TRANSISTOR (IPM)

  • Page 56: 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 °C (°F) power source, malfunction of a compressor and a fan.
  • Page 57 15.1.1 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 58: Breakdown Self Diagnosis Function

    15.2 Breakdown Self Diagnosis Function 15.2.1 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 59: Error Codes Table

    15.3 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 60 Diagnosis Abnormality / Abnormality Protection Problem Check location display Protection control Judgment Operation  Check refrigeration system Outdoor cooling high 4 times happen Cooling high pressure — pressure protection within 20 minutes protection  Outdoor air circuit Power transistor  PCB faulty 4 times happen Power transistor module module overheating...

  • Page 61: 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 62: Troubleshooting

    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 63 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 64 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 65 15.4.5 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 66 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 67 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 68 15.4.8 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 69 15.4.9 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 70 15.4.10 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 71 15.4.11 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 72 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 73 15.4.13 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. ...
  • Page 74 15.4.14 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 75 15.4.15 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 (35.6°F)) Malfunction Caused ...
  • Page 76 15.4.16 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 77 15.4.17 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 78 15.4.18 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 When F91 indication happens. For safety reason and to prevent component breakdown, always switch Caution...
  • Page 79 15.4.19 F93 (Compressor Rotation Failure) Malfunction Decision Conditions  A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Caused  Compressor terminal disconnect  Faulty Outdoor PCB  Faulty compressor Troubleshooting When F93 indication happens.
  • Page 80 15.4.20 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 81 15.4.21 F96 (IPM Overheating) Malfunction Decision Conditions  During operating of cooling and heating, when IPM temperature data (100°C (202°F)) 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 (194°F)) is detected by the heat sink temperature sensor.
  • Page 82 15.4.22 F97 (Compressor Overheating) Malfunction Decision Conditions  During operation of cooling and heating, when compressor tank temperature data (112°C (233.6°F)) is detected by the compressor tank temperature sensor. Malfunction Caused  Faulty compressor tank temperature sensor  2/3 way valve closed ...
  • Page 83 15.4.23 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 84 15.4.24 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 85: 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 Disassembly of Parts Front Grille Intake Grille...
  • Page 86 Hooks To remove the Electronic Controller, release the 6 hooks that hold it to the Control Board (Fig. 4). Electronic Controller Fig. 4 Screw B Front Grille Screw C Remove the Front Grille by removing the screw A and scr ews B, C &...
  • Page 87 Remove the Fan Motor by release the Fan Motor lead wire connectors and Fan Motor screws (Fig. 8). Screws Connectors Fig. 8...

  • Page 88: Outdoor Electronic Controller Removal Procedure

    16.2 Outdoor Electronic Controller Removal Procedure 16.2.1 CU-E12RB4U Caution! When handling electronic controller, be careful of electrostatic discharge. Remove the 3 screws of the Top Panel. Remove the Control Board as follows: Screw Control Board Release 3 Top Panel Terminal Connectors Screws and Earth Wire Screw Release 5•...
  • Page 89 16.2.2 CU-E18RB4U Caution! When handling electronic controller, be careful of electrostatic discharge. Remove the 4 screws of the Top Panel. Remove the Control Board. Screws Release the Hooks Top Panel Control Board Release 6 terminal Screws connectors Release 6• connectors Fig.

  • Page 90: Technical Data

    17.1 Cool Mode Performance Data Unit setting: Standard piping length, Hi Fan, Cool mode at 16°C (60.8°F) Voltage: 208V/230V 17.1.1 CS-E12RB4UW CU-E12RB4U Rated frequency (compressor speed is fixed during forced heating or cooling for capacity measurement and diagnosis purpose) Indoor (°C / °F) Outdoor (°C / °F)
  • Page 91 17.1.3 CS-E12RB4UW CU-E12RB4U Maximum Capacity Indoor (°C / °F) Outdoor (°C / °F) -17.8 (0) -10 (14) 0 (32) 5 (41) 19.0 (66.20) 13493 11821 13499 11827 13424 11923 13643 12118 (80.6) 22.0 (71.60) 14251 8400 14237 8392 14285 8490...

  • Page 92: Heat Mode Performance Data

    17.2 Heat Mode Performance Data Unit setting: Standard piping length, Hi Fan, Heat mode at 30°C (86°F) Voltage: 208V/230V 17.2.1 CS-E12RB4UW CU-E12RB4U Rated frequency (compressor speed is fixed during forced heating or cooling for capacity measurement and diagnosis purpose) Indoor (°C / °F) Outdoor (°C / °F)

  • Page 93: Service Data

    Unit setting: Standard piping length, forced cooling at 16°C (60.8°F), Hi fan  Compressor frequency: Rated for cooling operation  Piping Length: 7.5 m (24.6 ft)  Voltage: 208V/230V 18.1.1 CS-E12RB4UW CU-E12RB4U 14.0 (57.2) 13.5 (56.3) 13.0 (55.4) 12.5 (54.5) 12.0 (53.6) 11.5 (52.7) (-4) (4.9)
  • Page 94 18.1.2 CS-E18RB4UW CU-E18RB4U 15.5 (59.9) 15.0 (59.0) 14.5 (58.1) 14.0 (57.2) 13.5 (56.3) 13.0 (55.4) 12.5 (54.5) 12.0 (53.6) 11.5 (52.7) 11.0 (51.8) 10.5 (50.9) 10.0 (50.0) 9.5 (49.1) 9.0 (48.2) (-4) (4.9) (14) (23) (32) (41) (50) (59) (68) (77) (86) (95)

  • Page 95: Heat Mode Outdoor Air Temperature Characteristic

    Unit setting: Standard piping length, forced heating at 30°C (86°F), Hi fan  Compressor frequency: Rated for Heating operation  Piping Length: 7.5 m (24.6 ft)  Voltage: 208V/230V 18.2.1 CS-E12RB4UW CU-E12RB4U 43.0 (109.4) 42.0 (107.6) 41.0 (105.8) 40.0 (104.0) 39.0 (102.2) 38.0 (100.4) 37.0 (98.6) 36.0 (96.8)
  • Page 96 18.2.2 CS-E18RB4UW CU-E18RB4U 49.0 (120.2) 48.0 (118.4) 47.0 (116.6) 46.0 (114.8) 45.0 (113.0) 44.0 (111.2) 43.0 (109.4) 42.0 (107.6) 41.0 (105.8) 40.0 (104.0) 39.0 (102.2) (4.9) (14) (23) (32) (41) (50) (59) (68) (77) Outdoor Air Temperature °C (°F) 13.000 12.500 12.000 11.500...

  • Page 97: Piping Length Correction Factor

    18.3 Piping Length Correction Factor The characteristic of the unit has to be corrected in accordance with the piping length. 18.3.1 CS-E12RB4UW CU-E12RB4U 18.3.1.1 Cooling Capacity 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.95 0.94 (16.4) (32.8) (49.2) (65.6)
  • Page 98 18.3.2 CS-E18RB4UW CU-E18RB4U 18.3.2.1 Cooling Capacity 1.02 1.01 1.00 0.99 0.98 0.97 0.96 (16.4) (32.8) (49.2) (65.6) (82.0) (98.4) (114.8) Piping length m (ft) 18.3.2.2 Heating Capacity 1.01 1.00 0.99 0.98 0.97 (16.4) (32.8) (49.2) (65.6) (82.0) (98.4) (114.8) Piping length m (ft) Note: The graphs show the factor after added right amount of additional refrigerant.

  • Page 99: Exploded View And Replacement Parts List

    19. Exploded View and Replacement Parts List 19.1 Indoor Unit...
  • Page 100 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 101 <Model: CS-E12RB4UW CS-E18RB4UW> SAFETY REF. NO. PART NAME & DESCRIPTION CS-E12RB4UW CS-E18RB4UW REMARK BASE PAN ASS’Y CWD52K1100 ← INNER POLYSTYRENE COMPLETE CWG07C1047A ← CABINET SIDE PLATE ASS’Y CWE041121 ← CABINET SIDE PLATE ASS’Y CWE041122 ← LEAD WIRE - FAN MOTOR CWA67C5136 ←...
  • Page 102 SAFETY REF. NO. PART NAME & DESCRIPTION CS-E12RB4UW CS-E18RB4UW REMARK OPERATING INSTRUCTION CWF569879 ← INSTALLATION INSTRUCTION CWF616670 ← INSTALLATION INSTRUCTION CWF616671 ← (Note)  All parts are supplied from PAPAMY, Malaysia (Vendor Code: 00029488).  “O” marked parts are recommended to be kept in stock.

  • Page 103: Cz-Bt20U (Front Grille Complete)

    19.2 CZ-BT20U (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 104 SAFETY REF. NO. PART NAME & DESCRIPTION CZ-BT20U REMARK FRONT GRILLE - COMPLETE CWE11C6074 A.S MOTOR DC SINGLE 12V 250 OHM CWA981105J BRACKET - A.S.MOTOR CWD932522 VANE CWE241159 SHAFT CWH631038 SHAFT CWH631045 CONNECTOR - SHAFT CWH081007 BEARING CWH641008 PLATE COVER FOR A.S.MOTOR CWD911459 PLATE COVER FOR CONNECTING SHAFT CWD911460...

  • Page 105: Outdoor Unit

    19.3 Outdoor Unit 19.3.1 CU-E12RB4U 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. PART NAME & DESCRIPTION QTY. CU-E12RB4U REMARK CHASSIS COMPLETE CWD50K2081A SOUND PROOF MATERIAL CWG302570 FAN MOTOR BRACKET CWD541089 SCREW - FAN MOTOR BRACKET CWH551217 FAN MOTOR ARW6404AC SCREW - FAN MOTOR MOUNT CWH55252J PROPELLER FAN ASSY CWH03K1014 NUT - PROPELLER FAN CWH56053J COMPRESSOR...
  • Page 107 19.3.2 CU-E18RB4U 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 108 SAFETY REF NO. DESCRIPTION & NAME QTY. CU-E18RB4U REMARK CHASSIS COMPLETE CWD52K1228A ANTI - VIBRATION BUSHING CWH50055 COMPRESSOR 5KD240XAF21 NUT - COMPRESSOR MOUNT CWH561049 SOUND PROOF MATERIAL CWG302246 FAN MOTOR BRACKET CWD541127 FAN MOTOR EHDS80CAC SCREW - FAN MOTOR BRACKET CWH551217 SCREW - FAN MOTOR MOUNT CWH551323...
  • Page 109 SAFETY REF NO. DESCRIPTION & NAME QTY. CU-E18RB4U REMARK TUBE ASSY CO. (CAP. TUBE) CWT01C6093 DISCHARGE MUFFLER (4 W. VALVE) CWB121055 (NOTE)  All parts are supplied from PAPAMY, Malaysia (Vendor Code: 00029488).  “O” marked parts are recommended to be kept in stock. Printed in Malaysia FY0315-0...

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