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Panasonic CU-2E18NBU Service Manual

Outdoor unit
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Please file and use this manual together with the service manual for Model No. CS-E9NKUAW CS-E12NKUAW, Order No.
PHAAM1111087C1.
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.

TABLE OF CONTENTS

1. Safety Precautions.............................................3
2. Specifications .....................................................5
2.1
CU-2E18NBU ...............................................5
3. Dimensions .........................................................8
4. Refrigeration Cycle Diagram.............................9
5. Block Diagram ..................................................10
6. Wiring Connection Diagram............................11
7. Electronic Circuit Diagram ..............................12
8. Printed Circuit Board .......................................13
8.1
Main Printed Circuit Board .........................13
8.2
8.3
Display Printed Circuit Board .....................14
9. Installation Information ...................................15
9.1
Check Points ..............................................15
Outdoor Unit
CU-2E18NBU
WARNING
PRECAUTION OF LOW TEMPERATURE
10. Installation Instruction.....................................16
11. Operation Control.............................................20
13. Protection Control............................................23
10.1
Select The Best Location ...........................16
10.2
Install The Outdoor Unit .............................17
10.3
Connect the Piping .....................................17
10.4
Evacuation of the Equipment .....................18
Unit .............................................................19
10.6
Heat Insulation ...........................................19
11.1
Cooling Operation ......................................20
11.2
Heating Operation ......................................21
13.1
13.2
Dew Prevention control (Cool) ...................23
Protection 1 (Cool) .....................................23
© Panasonic HA Air-Conditioning (M) Sdn. Bhd. 2011.
Unauthorized copying and distribution is a violation of law.
Order No: PHAAM1111120A1

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Summary of Contents for Panasonic CU-2E18NBU

  • Page 1: Table Of Contents

    Freeze Prevention control (Cool) ....23 13.2 Dew Prevention control (Cool) ....23 9. Installation Information ........15 13.3 Electronic Parts Temperature Rise Check Points ..........15 Protection 1 (Cool) ........23 © Panasonic HA Air-Conditioning (M) Sdn. Bhd. 2011. Unauthorized copying and distribution is a violation of law.
  • Page 2 (Gas leak detection control 2) ....26 13.15 Valve close detection control......26 13.16 Compressor discharge high pressure protection control ........26 14. Servicing Mode ..........27 14.1 CU-2E18NBU ..........27 15. Troubleshooting Guide........29 15.1 Self Diagnosis Function......29 16. Disassembly and Assembly Instructions ..32 16.1 Outdoor Unit Removal Procedure ....32...

  • 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 18. For R410A models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only R410A materials.

  • Page 5: Specifications

    2. Specifications CU-2E18NBU Item Unit OUTDOOR UNIT Indoor Unit Combination 3.2kW + 3.2kW 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 7.6 - 6.9 Power Input 1.45 (0.39 ~ 1.84)
  • Page 6 (as shown in the table above) Example: The indoor units’ combination below is possible to connect to CU-2E18NBU. (Total nominal capacity of indoor units is between 5.6 kW to 6.4 kW) 1) Two CS-E9NKUAW only. (Total nominal cooling capacity is 5.6 kW) 2) One CS-E9NKUAW and one CS-E12NKUAW.
  • Page 7 (L/h) 2.82 1.81 ~ 3.27 390 ~ 1020 One-room Cooling Operation 3.21 1.85 ~ 3.75 1000 390 ~ 1230 CU-2E18NBU 2.8 + 2.8 4.89 2.09 ~ 5.86 1450 390 ~ 1920 0.5 + 0.5 Two-room Cooling 2.8 + 3.2 4.89 2.10 ~ 5.86...

  • Page 8: Dimensions

    3. Dimensions...

  • Page 9: Refrigeration Cycle Diagram

    4. Refrigeration Cycle Diagram...

  • Page 10: Block Diagram

    5. Block Diagram...

  • Page 11: Wiring Connection Diagram

    6. Wiring Connection Diagram...

  • Page 12: Electronic Circuit Diagram

    7. Electronic Circuit Diagram...

  • Page 13: Printed Circuit Board

    8. Printed Circuit Board Main Printed Circuit Board...

  • Page 14: Noise Filter Printed Circuit Board

    Noise Filter Printed Circuit Board Display Printed Circuit Board...

  • Page 15: Installation Information

    ID additional Patterns ID unit rant unit Outdoor (OD): CU-2E18NBU Indoor (ID): 2 UNITS OF CS- E9NKUAW Outdoor (OD): CU-2E18NBU 208/230V 60 Hz Indoor (ID): 2 Ø3/8” Ø1/4” UNITS OF CS- 16700 R410A 24.6 ft...

  • Page 16: Installation Instruction

    10. Installation Instruction 10.1 Select The Best Location 10.1.1 Outdoor Unit If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat radiation from the condenser is not obstructed. There should not be any animal or plant which could be affected by hot air discharged.

  • Page 17: 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" or less. 10.2 Install The Outdoor Unit After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram.

  • Page 18: Evacuation Of The Equipment

    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 19: Connect The Cable To The Outdoor Unit

    10.5 Connect The Cable To The Outdoor Unit Remove Control Board Cover (Metal) by loosening 2 screws. Remove Valve Cover (Metal) by loosening 2 screws. Remove Plugs. Fix the conduit connectors to the knock out holes with lock-nuts, then secure them. Connecting wire between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor wires minimum AWG16...

  • Page 20: 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: 11.1.2 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 21: 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: 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 22: 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 23: 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 24: 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. 13.6 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 25: Deice Control

    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-2E18NBU Operation Mode X (A) Y (A) 14.0...

  • Page 26: Compressor Protection Control (Gas Leak Detection Control 1)

    13.13 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 39.2°F. During Heating operation: Indoor pipe temperature —...

  • Page 27: Servicing Mode

    14. Servicing Mode 14.1 CU-2E18NBU 14.1.1 Pump down operation (SW1) Operate the pump down process according to the following procedure Confirm the valve on the liquid side and gas side are open. Press PUMP DOWN button (SW1) on the Service PCB inside the outdoor unit for more than 5 seconds.
  • Page 28 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 29: 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 32: 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 33 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 34 Disconnect the fan motor connector from the control P.C. Board. Loosen the 4 fan motor mounting screws then remove the fan motor.

  • Page 35: Technical Data

    17. Technical Data 17.1 Operation Characteristics 17.1.1 One Indoor Unit Operation Cooling Characteristic [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fc A) Indoor unit capacity: Cooling (2.8: CS-E9NKUAW), service mode frequency = 28Hz 60.000 59.000 58.000...
  • Page 36 Cooling Characteristic [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fc B) Indoor unit capacity: Cooling (3.2: CS-E12NKUAW), service mode frequency = 33Hz 60.000 59.000 58.000 57.000 56.000 55.000 54.000 53.000 Outdoor Air Temperature (°F) 4.200 4.000...
  • Page 37 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 A) Indoor unit capacity: Cooling (2.8: CS-E9NKUAW), service mode frequency = 28Hz 59.500 59.000 58.500 58.000 57.500 Piping Length (ft) 3.000 2.900...
  • Page 38 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 B) Indoor unit capacity: Cooling (3.2: CS-E12NKUAW), service mode frequency = 33Hz 58.500 58.000 57.500 57.000 56.500 56.000 55.500 Piping Length (ft)
  • Page 39 Heating Characteristic [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fh Heating overload protection: 38Hz (Outside air 75.2°F) A) Indoor unit capacity: Heating (2.8: CS-E9NKUAW), service mode frequency = 52Hz 113.200 108.200 103.200 98.200 93.200 88.200...
  • Page 40 Heating Characteristic [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fh Heating overload protection: 44Hz (Outside air 75.2°F) B) Indoor unit capacity: Heating (3.2: CS-E12NKUAW), service mode frequency = 52Hz 113.000 108.000 103.000 98.000 93.000 88.000...
  • Page 41 Piping Length Characteristic Heating [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Outdoor temperature: 47°F (DBT), 43°F (WBT) Compressor Freq: Fh A) Indoor unit capacity: Heating (2.8: CS-E9NKUAW), service mode frequency = 52Hz 112.000 111.000 110.000 109.000 108.000 107.000 106.000 Piping Length (ft)
  • Page 42 Piping Length Characteristic Heating [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Outdoor temperature: 47°F (DBT), 43°F (WBT) Compressor Freq: Fh B) Indoor unit capacity: Heating (3.2: CS-E12NKUAW), service mode frequency = 52Hz 110.000 109.000 108.000 107.000 106.000 105.000 104.000 103.000...
  • Page 43 17.1.2 Two Indoor Unit Operation Cooling Characteristic [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fc A) Indoor unit capacity: Cooling (2.8 + 2.8: CS-E9NKUAW + CS-E9NKUAW), service mode frequency = 48Hz 61.000 60.000 59.000...
  • Page 44 Cooling Characteristic [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fc B) Indoor unit capacity: Cooling (3.2 + 3.2: CS-E12NKUAW + CS-E12NKUAW), service mode frequency = 46Hz 62.000 61.000 60.000 59.000 58.000 57.000 56.000...
  • Page 45 Cooling Characteristic [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fc C) Indoor unit capacity: Cooling (2.8 + 3.2: CS-E9NKUAW + CS-E12NKUAW), service mode frequency = 47Hz...
  • Page 46 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 A) Indoor unit capacity: Cooling (2.8 + 2.8: CS-E9NKUAW + CS-E9NKUAW), service mode frequency = 48Hz 60.400 60.200 60.000 59.800...
  • Page 47 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 B) Indoor unit capacity: Cooling (3.2 + 3.2: CS-E12NKUAW + CS-E12NKUAW), service mode frequency = 46Hz 61.700 61.200 60.700 60.200...
  • Page 48 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 C) Indoor unit capacity: Cooling (2.8 + 3.2: CS-E9NKUAW + CS-E12NKUAW), service mode frequency = 47Hz...
  • Page 49 Heating Characteristic [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fh A) Indoor unit capacity: Heating (2.8 + 2.8: CS-E9NKUAW + CS-E9NKUAW), service mode frequency = 65Hz 119.000 114.000 109.000 104.000 99.000 94.000 89.000 84.000 Outdoor Air Temperature (°F)
  • Page 50 Heating Characteristic [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fh B) Indoor unit capacity: Heating (3.2 + 3.2: CS-E12NKUAW + CS-E12NKUAW), service mode frequency = 63Hz 118.000 113.000 108.000 103.000 98.000 93.000 88.000 83.000 Outdoor Air Temperature (°F)
  • Page 51 Heating Characteristic [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fh C) Indoor unit capacity: Heating (2.8 + 3.2: CS-E9NKUAW + CS-E12NKUAW), service mode frequency = 64Hz...
  • Page 52 Piping Length Characteristic Heating [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Outdoor temperature: 47°F (DBT), 43°F (WBT) Compressor Freq: Fh A) Indoor unit capacity: Heating (2.8 + 2.8: CS-E9NKUAW + CS-E9NKUAW), service mode frequency = 65Hz 97.000 96.900 96.800 96.700...
  • Page 53 Piping Length Characteristic Heating [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Outdoor temperature: 47°F (DBT), 43°F (WBT) Compressor Freq: Fh B) Indoor unit capacity: Heating (3.2 + 3.2: CS-E12NKUAW + CS-E12NKUAW), service mode frequency = 63Hz 95.000 94.500 94.000 93.500...
  • Page 54 Piping Length Characteristic Heating [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Outdoor temperature: 47°F (DBT), 43°F (WBT) Compressor Freq: Fh C) Indoor unit capacity: Heating (2.8 + 3.2: CS-E9NKUAW + CS-E12NKUAW), service mode frequency = 64Hz...

  • Page 55: Exploded View And Replacement Parts List

    18. 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 56 REF. NO. DESCRIPTION & NAME Q’TY CU-2E18NBU REMARK BASE PAN ASS'Y CWD52K1239A SOUND-PROOF BOARD CWH151230 FAN MOTOR BRACKET CWD541127 SCREW-FAN MOTOR BRACKET CWH551217 CONDENSER COMPLETE CWB32C2905 FAN MOTOR EHDS80CAC SCREW-FAN MOTOR CWH551323 PROPELLER FAN CWH00K1006 NUT - PROPELLER FAN CWH561038J...
  • Page 57 ACCESSORY CO. (DRAIN ELBOW) CWG87C900 NUT - TERMINAL COVER CWH7080300J TERMINAL COVER CWH171035 TUBE ASS'Y (LIQUID 1) CWT026284 TUBE ASS'Y (LIQUID 2) CWT026285 MANIFOLD TUBE ASS'Y (GAS) CWT07K1522 CLIP FOR SENSOR HOLDER CWH711010 CWG861154 BASE BOARD-COMPLETE CWG62C1081 SHOCK ABSORBER - RIGHT CWG712879 SHOCK ABSORBER - LEFT CWG712880...

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