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Nobu NBO-12IDU Service Manual

Wall mounted air-conditioning unit
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Wall Mounted Air-Conditioning Unit
MODELS
NBO-09IDU/NBO-09ΟDU
NBO-12IDU/NBO-12ΟDU
NBO-18IDU/NBO-18ΟDU
NBO-24IDU/NBO-24ΟDU
Wall Mounted Air-Conditioning Unit
Service Manual
English

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Summary of Contents for Nobu NBO-12IDU

  • Page 1 Wall Mounted Air-Conditioning Unit MODELS NBO-09IDU/NBO-09ΟDU NBO-12IDU/NBO-12ΟDU NBO-18IDU/NBO-18ΟDU NBO-24IDU/NBO-24ΟDU Wall Mounted Air-Conditioning Unit Service Manual English...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................3 1.1 Safety Precaution .......................... 3 1.2 Warning ............................3 2. Function ................................ 6 3. Dimension ..............................7 3.1 Indoor Unit ............................. 7 3.2 Outdoor Unit ..........................11 4. Refrigerant Cycle Diagram&Wiring diagram................... 15 5 Installation Details ............................18 5.1 Wrench torque sheet for installation ...................

  • Page 3: Precaution

    installing the product. Sharp edges could cause injury, be especially 1. Precaution careful of the case edges and the fins on the condenser and evaporator. 1.1 Safety Precaution  For installation, always contact the dealer or an authorized service center. ...
  • Page 4 from product, turn the breaker off or water is drained away properly. disconnect the power supply cable. A bad connection may cause water leakage.  There is risk of electric shock or fire. Keep level even when installing the  Stop operation and close the window product.
  • Page 5 through air inlet or outlet while the product types of batteries. is operated. There is risk of fire or explosion.   Do not drink the water drained from Do not recharge or disassemble the the product. batteries. Do not dispose of batteries in a ...

  • Page 6: Function

    2. Function Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units NBO-09IDU NBO-09ΟDU NBO-12IDU NBO-12ΟDU Inverter NBO-18IDU NBO-18ΟDU NBO-24ΟDU NBO-24IDU 2 ways piping connection Filter Killer Of Formaldehyde Louver Position Memory Function Ionizer(O) Refrigerant Leakage Detect Silver Ico Filter(O) Self-diag.

  • Page 7: Dimension

    3. Dimension 3.1 Indoor Unit Model NBO-09IDU NBO-12IDU NBO-18IDU NBO-24IDU 1045...
  • Page 8 For NBO-09IDU，...
  • Page 9 For NBO-12IDU， For NBO-18IDU，...
  • Page 10 For NBO-24IDU，...

  • Page 11: Outdoor Unit

    3.2 Outdoor Unit More than 30cm More than 60cm (Service space) More than 30cm More than 60cm More than 200cm...
  • Page 12 For NBO-09ΟDU 779 W3 4 8 7 300 D 770 W 25 B1 61.5 A2 12 A1...
  • Page 13 815 W3 5 1 4 333 D 8 0 0 70 W2 62 B1 D2 D3 20 A1 61.6 A2...
  • Page 14 For NBO-24ΟDU,...

  • Page 15: Refrigerant Cycle Diagram&Wiring Diagram

    CAPILIARY TUBE HEAT EXCHANGE HEAT (EVAPORATOR) T4 Ambient T1 Room temp. EXCHANGE temp. sensor sensor (CONDENSER) T2 Evaporator temp. sensor GAS SIDE 4-WAY VALVE 3-WAY VALVE Accumulator T5 Discharge temp. sensor Compressor COOLING HEATING NBO-09IDU, NBO-12IDU, NBO-18IDU, NBO-24IDU...
  • Page 16 91454 2020328 NBO-09ΟDU, NBO-12ΟDU...
  • Page 17 NBO-18ΟDU, NBO-24ΟDU...

  • Page 18: Installation Details

    5 Installation Details 5.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N.cm N.cm Ф6.35 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 3500(357kgf.cm) 3600(367kgf.cm) Ф15.9 4500(459kgf.cm) 4700(479kgf.cm) Ф19 6500(663kgf.cm) 6700(683kgf.cm) 5.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Rated current of appliance Nominal cross-sectional area (mm²...

  • Page 19: Pipe Length And The Elevation

    Elevation Length refrigerant Liquid B (m) A (m) (g/m) 3/8’’ 1/4’’ NBO-09IDU + NBO-09ΟDU (Ф6.35) (Ф9.52) 3/8’’ 1/4’’ NBO-12IDU + NBO-12ΟDU (Ф6.35) (Ф9.52) 1/4’’ 1/2’’ NBO-18IDU + NBO-18ΟDU (Ф12.7) (Ф6.35) 3/8’’ 5/8’’ NBO-24IDU + NBO-24ΟDU (Ф15.9) (Ф9.52) Caution: The capacity test is based on the standard length and the maximum permissive length is based on the...

  • Page 20: Installation For The First Time

    connection to the vacuum pump. 5.4 Installation for the first time 4) Fully open the handle Lo of the manifold Air and moisture in the refrigerant system have valve. undesirable effects as below: 5) Operate the vacuum pump to evacuate. ●...

  • Page 21: Adding The Refrigerant After Running The System For Many Years

    cylinder to the service port of the 3-way valve. up to ensure the liquid charge. 3). Air purging. 2). Purge the air from the charge hose. Open the valves on the charging cylinder and the Open the valve at the bottom of the cylinder charge set.

  • Page 22: Re-Installation While The Indoor Unit Need To Be Repaired

    purge the air (be careful of the liquid Open the handle Lo valve of the manifold valve refrigerant). slightly to purge air from the charge hose for 5 3) Put the charging cylinder onto the electronic seconds and then close it quickly. scale and record the weight.

  • Page 23: Re-Installation While The Outdoor Unit Need To Be Repaired

    nut on the 2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa. 6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems.
  • Page 24 Be sure to check for gas leakage...

  • Page 25: Operation Characteristics

    6. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode ≥17℃ ≤30℃ ＞10℃ Room temperature 0℃～50℃ -15℃～50℃ Outdoor temperature -15℃～30℃ 0℃～50℃ (For the models with low temperature cooling system) CAUTION: 1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into operation and cause the unit to operate abnormally.

  • Page 26: Electronic Function

    7. Electronic function 7.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature 7.2 Display function 7.2.1 Icon explanation on indoor display board. ION indication lamp(optional function)：This lamp illuminates when Clean Air feature is activated.

  • Page 27: Main Protection

    sensor in malfunction, the air conditioner will stop working. 7.3.9 Refrigerant leakage detection This function is only active in cooling mode. It 7.3 Main Protection can better prevent the compressor being damaged by refrigerant leakage or compressor 7.3.1 Three minutes delay at restart for overload.

  • Page 28: Operation Modes And Functions

    7.4 Operation Modes and Functions 7.4.1 Fan mode (1) Outdoor fan and compressor stop. (2) Temperature setting function is disabled, and no setting temperature is displayed. (3) Indoor fan can be set to high/med/low/auto. (4) The louver operates same as in cooling mode.
  • Page 29 7.4.3.3 Indoor fan running rules When the compressor is on, the indoor fan can be set to high/med/low/auto/mute. Decrease When indoor unit coil temp. is low, the anti-cold air function will start and indoor fan motor will Hold run at low speed, the speed can’t be Resume changed ,when the temp.
  • Page 30 If any one of the following items is satisfied, the Heating*: For cooling only models, they will run defrosting will finish and the machine will turn to at fan speed normal heating mode. Indoor fan will run at auto fan of the relevant ----T3 rises to be higher than TCDE1℃.
  • Page 31 automatically when reaching the setting “off” minute delay when power on. Other conditions, time, and then turn on automatically when the compressor will have 3 minutes delay when reaching the setting “on” time. restarts. 7.4.7.6 The timer function will not change the AC current operation mode.
  • Page 32 room temperature from the remote controller and the setting temperature. The PCB will take action to the mode change information from remote controller signal, but it will not affected by the setting temperature. When the unit is running with follow me function, if the PCB doesn’t receive any signal from remote controller for 7 minutes or pressing FOLLOW ME button again, the follow me...
  • Page 33 7.4.15 Point check function Press the LED DISPLAY or LED or MUTE button of the remote controller three times, and then press the AIR DIRECTION or SWING button three times in ten seconds, the buzzer will keep ring for two seconds.
  • Page 34 Enquiry Display value Meaning Remark information T1,T2,T3,T4, -1F,-1E,-1d,-1c,- -25,-24,-23,-22,-21,-2 1. All the displaying temperature is actual T2B,TP,TH, 1b,-1A value. Targeted -19—99 -19—99 2. All the temperature is ° C no matter what A0,A1,…A9 100,101,…109 Frequency, kind of remote controller is used. b0,b1,…b9 110,111,…119 Actual...

  • Page 35: Troubleshooting

    8. Troubleshooting Safety Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, - terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.

  • Page 36: Indoor Unit Error Display

    8.1 Indoor Unit Error Display Operation Timer lamp Display LED STATUS lamp ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆ 4 times Indoor fan speed has been out of control Indoor room temperature sensor T1 open circuit or short ☆...

  • Page 37: Trouble Shooting

    8.2 Trouble shooting 8.2.1 EEPROM parameter error diagnosis and solution(E0/F4) E0/F4 Error Code Malfunction decision Indoor or outdoor PCB main chip does not receive feedback conditions from EEPROM chip. Supposed causes Installation mistake ● PCB faulty ● Trouble shooting: Power off, then restart the unit 2 minutes later.
  • Page 38 8.2.2 Indoor / outdoor unit’s communication diagnosis and solution(E1) Error Code Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions seconds and this condition happens four times continuously. Supposed causes Wiring mistake ● Indoor or outdoor PCB faulty ●...
  • Page 39 8.2.3 Fan speed has been out of control diagnosis and solution(E3) E3/F5 Error Code Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, conditions the unit will stop and the LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 40 Index1: 1:Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced.
  • Page 41 8.2.4 Open circuit or short circuit of temperature sensor diagnosis and solution(E5) E4/E5/F1/F2/F3 Error Code Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, conditions the LED will display the failure. Supposed causes Wiring mistake Sensor faulty PCB faulty Trouble shooting:...
  • Page 42 8.2.5 Refrigerant Leakage Detection diagnosis and solution(EC) Error Code Malfunction decision Define the evaporator coil temp.T2 of the compressor just starts conditions running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 ＜Tcool－2℃ does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...
  • Page 43 8.2.6 Overload current protection diagnosis and solution(F0) Error Code Malfunction decision An abnormal current rise is detected by checking the specified conditions current detection circuit. Supposed causes Power supply problems. ● System blockage ● PCB faulty ● Wiring mistake ● Compressor malfunction ●...
  • Page 44 8.2.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Error Code Malfunction decision When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P0” and AC will turn off. conditions Supposed causes Wiring mistake ●...
  • Page 45  IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Digital tester Normal resistance value Digital tester Normal resistance value (+)Red...
  • Page 46 8.2.8 Over voltage or too low voltage protection diagnosis and solution(P1) Error Code Malfunction decision An abnormal voltage rise or drop is detected by checking the conditions specified voltage detection circuit. Supposed causes Power supply problems. ● System leakage or block ●...
  • Page 47 8.2.9 High temperature protection of compressor top diagnosis and solution(P2) Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Power supply problems. ● System leakage or block ● PCB faulty ●...
  • Page 48 8.2.10 Inverter compressor drive error diagnosis and solution(P4) Error Code Malfunction decision An abnormal inverter compressor drive is detected by a special conditions detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Supposed causes Wiring mistake ●...
  • Page 49 Main parts check 1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 50 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (° C--K) ° C ° F K Ohm ° C ° F K Ohm ° C ° F K Ohm ° C ° F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148...
  • Page 51 Appendix 2 Temperature Sensor Resistance Value Table for T5 (° C --K) ° C ° F K Ohm ° C ° F K Ohm ° C ° F K Ohm ° C ° F K Ohm 542.7 68.66 13.59 3.702 511.9 65.62 13.11...
  • Page 52 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value ASN98D22UFZ ASM135D23UFZ ATF235D22UMT Blue - Red 1.57Ω 1.75Ω 0.75Ω Blue - Black (20℃/68℉) (20℃/68℉) (20℃/68℉) Red - Blue...
  • Page 54 AIR CONDITIONING SYSTEMS wall mounted unit Scan here to download the latest version of this manual. Σαρώστε εδώ για να κατεβάσετε την τελευταία έκδοση του εγχειριδίου.

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