Panasonic CU-2E18SBU-5 Service Manual
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Panasonic CU-2E18SBU-5 Service Manual

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Please file and use this manual together with the service manual for Model No. CS-ME5RKUA CS-ME7RKUA, CS-E9RKUA
CS-E12RKUA, CS-ME9SB4U, CS-E12RB4UW, CS-ME5SD3UA CS-ME7SD3UA, CS-E9SD3UAW CS-E12SD3UAW, Order No.
PAPAMY1503085CE, PAPAMY1501049CE, PAPAMY1604059CE, PAPAMY1503095CE, PAPAMY1604056CE,
PAPAMY1604052CE.
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.
WARNING
PRECAUTION OF LOW TEMPERATURE
Order No: PAPAMY1702089CE

Outdoor Unit

CU-2E18SBU-5
Destination
USA
CANADA
© Panasonic Corporation 2017

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Summary of Contents for Panasonic CU-2E18SBU-5

  • Page 1: Outdoor Unit

    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 2017...

  • Page 2: Table Of Contents

    Compressor Discharge High Pressure       Protection Control ........30   Specifications ............. 5     Servicing Mode ..........31     CU-2E18SBU-5 ..........5     14.1 CU-2E18SBU-5 ..........31     Dimensions ............10     Troubleshooting Guide ........33  ...

  • Page 3: Safety Precautions

    1. Safety Precautions  Read the following “SAFETY PRECAUTIONS” carefully before installation.  Electrical work must be installed by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model to be installed. ...
  • Page 4 During installation, install the refrigerant piping properly before running 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. During pump down operation, stop the compressor before removing the refrigeration piping.

  • Page 5: Specifications

    2. Specifications CU-2E18SBU-5 Item Unit OUTDOOR UNIT Indoor Unit Combination 2.5kW + 2.5kW 1 Phase, 208 – 230V, 60Hz (Power supply from Power Source outdoor unit) 4.89 (2.10 ~ 5.86) Capacity BTU/h 16700 (7200 ~ 20000) Running Current 6.6 - 6.0 Power Input 1.33 (0.36 ~ 1.69)
  • Page 6 -21.56 (-6.8) Note  Specifications are subject to change without notice for further improvement.  Multi split combination possibility: A single outdoor unit enables air conditioning of up to two separate rooms for CU-2E18SBU-5. Multi Zone Capacity (kW) CU-2E18SBU-5 CS-ME5RKUA ●...
  • Page 7 Indoor unit Cooling Capacity (kW) Input Power (W) Moisture capacity Current, Total SEER Removal 230V (A) Room Room Volume (l/h) Cooling Total min ～ max Rating min ～ max 1.6 + 1.6 1.620 1.620 3.24 2.10 ～ 3.89 360 ～ 960 4.20 19.00 0.3 + 0.3...
  • Page 8 Indoor unit capacity Cooling Capacity (kW) Input Power (W) Moisture (Ducted Current, Total SEER Removal Indoor) 230V (A) Volume (l/h) Room Room Cooling Total min ～ max Rating min ～ max 1.6 + 1.6 1.620 1.620 3.24 2.10 ～ 3.89 360 ～...
  • Page 9 Indoor unit capacity Moisture Heating Capacity (kW) Input Power (W) HSPF Current, (Ducted Removal Total 230V Indoor) Volume (l/h) Room Room Region Region Heating Total min ～ max Rating min ～ max 1.6 + 1.6 2.350 2.350 4.70 2.11 ～ 5.64 1450 400 ～...

  • Page 10: Dimensions

    3. Dimensions <Top View> Space necessary for installation (5-5/32) 1-3/32 24-1/8 5-5/32 3-3/4 3-7/8 3-7/8 39-3/38 Anchor Bolt Pitch 14-13/64 x 24-1/8 <Side View> <Front View> <Side View> 34-15/32 2-5/16 12-5/8 1-21/32 15/16 Unit: inch 2-1/2...

  • Page 11: Refrigeration Cycle Diagram

    4. Refrigeration Cycle Diagram INDOOR A OUTDOOR PIPE EXPANSION TEMP. STRAINER VALVE A SENSOR LIQUID SIDE 3-WAY VALVE INTAKE TEMP. SENSOR PIPE PIPE TEMP. TEMP. SENSOR SENSOR LIQUID SIDE 3-WAY VALVE EXPANSION STRAINER GAS SIDE HEAT VALVE B EXCHANGER 3-WAY VALVE (EVAPORATOR) 3-WAY VALVE STRAINER...

  • Page 12: Block Diagram

    5. Block Diagram...

  • Page 13: Wiring Connection Diagram

    6. Wiring Connection Diagram...

  • Page 14: Electronic Circuit Diagram

    7. Electronic Circuit Diagram...

  • Page 15: Printed Circuit Board

    8. Printed Circuit Board Main Printed Circuit Board CN-HT CN-HOT CN-DATA CN-EV1 CN-TH1 CN-EV2 CN-DIS CN-TH3 CN-TH2 CN-TH4 CN-PSW1 CN-FM1...

  • Page 16: Noise Filter Printed Circuit Board

    Noise Filter Printed Circuit Board CN-COM CN-DATA CN-WHT CN-BLK Display Printed Circuit Board CN-DISP1 CN-NMODE1 CN-NMODE2 LED1 LED2 LED3 LED4 LED5 LED6...

  • Page 17: Installation Information

    9. Installation Information Check Points 49.2 ft max. 82 ft 82 ft Total maximum pipe length: 164 ft QUICK GUIDE PIPING AND ELECTRICAL SPECIFICATION Min. Min. total Piping size Indoor (ID) & Max. Addi- pipe pipe Power Outdoor (OD) Standard Max.

  • Page 18: Installation Instruction

    10. Installation Instruction  IMPORTANT ® This product has been designed and manufactured to meet ENERGY STAR criteria for energy efficiency when matched with appropriate coil components. However, proper refrigerant charge and proper air flow are critical to achieve rated capacity and efficiency. Installation of this product should follow the manufacturer’s refrigerant charging and air flow instructions.

  • Page 19: Select The Best Location

    10.3 Select the Best Location 10.3.1 Outdoor Unit Installation parts you should purchase ( ) Outdoor Unit Installation Diagram  If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat radiation from It is advisable to avoid more the condenser is not obstructed.

  • Page 20: Install The Outdoor Unit

    Outdoor Unit Installation Guidelines  Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation guidelines below.  For any of the below installation patterns, the wall height on the exhaust side should be 47 1/4" (1200 mm) or less.

  • Page 21: Evacuation Of The Equipment

    10.6 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 Outdoor unit the Low side of a charging set and the service Tube connector Indoor Unit port of the gas side 3-way valve.

  • Page 22: Connect The Cable To The Outdoor Unit

    10.7 Connect the Cable to the Outdoor Unit Remove Control Board Cover (Metal) by Top Panel loosening 2 screws. Remove Valve Cover (Metal) by loosening 2 screws. Screws Control Board Cover (Metal) Remove Plugs. Fix the conduit connectors to the knock out holes with lock-nuts, then secure them.

  • Page 23: Operation Control

    11. Operation Control 11.1 Cooling Operation 11.1.1 Outdoor fan control  When cooling operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below: RPM free 59°F 55.4°F RPM controlled 8.6°F Stopped OD temp. 11.1.2 Annual Cooling control ...

  • Page 24: Heating Operation

    11.2 Heating Operation 11.2.1 Outdoor fan control  When heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below: RPM controlled 57.2°F 53.6°F RPM free OD temp.  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 25: Simultaneous Operation Control

    12. Simultaneous Operation Control Operation modes which can be selected using the remote control unit: Automatic, Cooling, Soft Dry, Heating, e-ion operation mode. Types of operations modes which can be performed simultaneously Cooling operation and cooling, Soft Dry or e-ion operation Heating operation and heating operation Types of operation modes which cannot be performed simultaneously...

  • Page 26: Protection Control

    13. Protection Control 13.1 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 27: Cooling Overload Control (Cool)

    13.5 Cooling Overload Control (Cool)  This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation. Comp stop 147.2°F (64°C) Comp freq restricted 140°F (60°C) 134.6°F (57°C) Comp freq free OD Pipe temp  The compressor will be stopped to avoid compressor overloading. COMP.

  • Page 28: Extreme Low Temperature Compressor Low Pressure Protection Control (Heat)

    If the running current does not exceed X value for 5 seconds, compressor frequency will increase.  However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for 3 minutes. CU-2E18SBU-5 Operation Mode X (A) Y (A) Cooling/Soft Dry (A) 12.2...

  • Page 29: Ipm (Power Transistor) Protection Control

    13.12 IPM (power transistor) Protection Control  Overheating Prevention Control If IPM temperature rises to 176°F, outdoor fan speed will be increased. When the IPM temperature rises to 203°F, compressor operation will stop immediately. Compressor operation restarts when temperature decreases to 194°F. If IPM temperature detected less than -22°F, IPM is judged as open circuit (“F96”...

  • Page 30: Protection Control

    13.16 Compressor Discharge High Pressure Protection Control  This control protect by using high pressure switch during operation.  Start conditions High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling or heating during compressor running. ...

  • Page 31: Servicing Mode

    14. Servicing Mode 14.1 CU-2E18SBU-5 Fig. 1 JP1 (COOL LED 1 ONLY) SW1 (PUMP DOWN) LED 2 OFF ON SW2 (OPERATION LED 3 TEST) LED 4 OFF ON SW3 (WIRING CHECK) LED 5 LED 6 L1 L2 14.1.1 Pump down operation (SW1) ...

  • Page 32: Wiring Error Check

    14.1.3 Wiring Error check  The unit capable to correct the wiring error automatically by following procedures. Confirm the valve on the liquid side and gas side is open. Press WIRING CHECK button (SW3) on the Service PCB inside the outdoor unit for more than 10 seconds to start wiring check operation.

  • Page 33: Troubleshooting Guide

    15. Troubleshooting Guide 15.1 Self Diagnosis Function  The display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printed circuit board in the outdoor unit can be used to identify the location of the problem. Refer to the table below to identify and solve the cause of the problem, and then re-start the air conditioner system.
  • Page 34 Abnormality Diagnosis Abnormality Protection LED 6 LED 5 LED 4 LED 3 LED 2 LED 1 Problem Check location display protection judgement operation control Outdoor liquid Continuous Cooling Outdoor liquid pipe  Outdoor liquid pipe for 5s protection temperature sensor pipe temperature temperature operation only...
  • Page 35 Abnormality Diagnosis Abnormality Protection LED 6 LED 5 LED 4 LED 3 LED 2 LED 1 Problem Check location display protection judgement operation control Power 4 times ― Power transistor  PCB faulty transistor happen within module overheat  Outdoor air module 30 minutes circuit (fan motor)

  • Page 36: Disassembly And Assembly Instructions

    16. Disassembly and Assembly Instructions WARNING High Voltage 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. 16.1 Outdoor Unit Removal Procedure Caution! When handling electronic controller, be careful of electrostatic discharge.
  • Page 37 16.1.3 Removing the Control P.C. Board Remove the drip proof cover. Disconnect the connectors (lead wires of the compressor, sensor, and others). Remove the screw at the right side of the control box, and pull out the entire control box. Release the control P.C.
  • Page 38 Disconnect the fan motor connector from the control P.C. Board. Loosen the 4 fan motor mounting screws then remove the fan motor.

  • Page 39: Technical Data

    17. Technical Data Technical data provided are based on the air conditioner running under free frequency. 17.1 Cool Mode Performance Data Unit setting: Standard piping length, Hi Fan, Cool mode at 60.8°F Voltage: 208-230V Indoor Air Temp. °C (°F) DB / WB Outdoor Combination 27/16...
  • Page 40 Indoor Air Temp. °C (°F) DB / WB Outdoor Combination 27/16 27/17.5 27/18 27/19 27/22 27/24 Air Temp. (Capacity) (kW) (80.6/60.8) (80.6/63.5) (80.6/64.4) (80.6/66.2) (80.6/71.6) (80.6/75.2) °C (°F) DB 22 (71.6) 5.55 1.02 5.72 1.01 5.78 1.00 5.89 0.99 6.48 0.98 6.88 0.97...

  • Page 41: Heat Mode Performance Data

    17.2 Heat Mode Performance Data Unit setting: Standard piping length, Hi Fan, Heat mode at 68°F Voltage: 208-230V Outdoor Air Temp. °C (°F) DB / WB Combination Indoor 16/15 11/10 -5/-6 -10/-11 (Capacity) Air Temp. 0 (32) -15/- (5/-) -21/- (-5/-) (60.8/59) (51.8/50) (44.6/42.8)
  • Page 42 Outdoor Air Temp. °C (°F) DB / WB Combination Indoor 16/15 11/10 -5/-6 -10/-11 (Capacity) Air Temp. 0 (32) -15/- (5/-) -21/- (-5/-) (60.8/59) (51.8/50) (44.6/42.8) (23/21.2) (14/12.2) (kW) °C (°F) DB 16 (60.8) 14.18 1.57 9.93 1.93 7.87 2.15 6.54 2.34 6.00...

  • Page 43: Service Data

    18. Service Data 18.1 Operation Characteristics  Cooling Characteristic [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fc Voltage: 208-230V A) Indoor unit capacity: Cooling (3.2 + 2.5: CS-E12RKUAW + CS-E9RKUAW), service mode frequency = 47Hz CS-E12RKUAW CS-E9RKUAW 64.000...
  • Page 44  Piping Length Characteristic Cooling [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Outdoor temperature: 95°F (DBT) Compressor Freq: Fc Voltage: 208-230V A) Indoor unit capacity: Cooling (3.2 + 2.5: CS-E12RKUAW + CS-E9RKUAW), service mode frequency = 47Hz CS-E12RKUAW CS-E9RKUAW 62.400...
  • Page 45  Heating Characteristic [Condition] Room temperature: 70°F (DBT), 60°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fh Voltage: 208-230V A) Indoor unit capacity: Heating (3.2 + 2.5: CS-E12RKUAW + CS-E9RKUAW), service mode frequency = 64Hz CS-E12RKUAW CS-E9RKUAW 115.000 110.000...
  • Page 46  Piping Length Characteristic Heating [Condition] Room temperature: 70°F (DBT) Operation condition: High fan speed Outdoor temperature: 47°F (DBT), 43°F (WBT) Compressor Freq: Fh Voltage: 208-230V A) Indoor unit capacity: Heating (3.2 + 2.5: CS-E12RKUAW + CS-E9RKUAW), service mode frequency = 64Hz CS-E12RKUAW CS-E9RKUAW 94.200...

  • Page 47: List

    19. Exploded View and Replacement Parts List 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 48 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CU-2E18SBU-5 REMARK CHASSY ASSY CWD52K1239A SOUND PROOF BOARD CWH151230 FAN MOTOR BRACKET CWD541127 SCREW - BRACKET FAN MOTOR CWH551217 CONDENSER COMPLETE ACXB32C00870 FAN MOTOR EHDS80CAC SCREW - FAN MOTOR MOUNT CWH551323 PROPELLER FAN ASSY...
  • Page 49 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CU-2E18SBU-5 REMARK CABINET SIDE PLATE (L) CWE041490A CABINET SIDE PLATE CWE041499A WIRE NET CWD041128A HANDLE CWE161010 INSTALLATION INSTRUCTION ACXF60-02470 INSTALLATION INSTRUCTION ACXF60-02480 ACCESSORY CO. (DRAIN ELBOW) CWG87C900 NUT - TERMINAL COVER CWH7080300J...

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