innovair NEXXOS NIN413C2V33 User Manual
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innovair NEXXOS NIN413C2V33 User Manual

innovair NEXXOS NIN413C2V33 User Manual

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NEXXOS
INVERTER MINI SPLIT
USER
MANUAL
WARNING
• The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments
• Installation or repairs made by unqualified persons can result in hazards to you and others.
• Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury and/or death.
• This service is only for service engineer to use.
NIN413C2V33
NIN720C2V33
NIN728C2V33

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Summary of Contents for innovair NEXXOS NIN413C2V33

  • Page 1 NEXXOS INVERTER MINI SPLIT USER MANUAL NIN413C2V33 NIN720C2V33 NIN728C2V33 WARNING • The information contained in the manual is intended for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments • Installation or repairs made by unqualified persons can result in hazards to you and others. •...
  • Page 2 Table of Contents Page 1. Safety Precautions ..................1 In case of Accidents or Emergency Pre-Installation and Installation Operation and Maintenance 2. Specifications ....................3 Model Reference Electrical Wiring Diagrams 3. Product Features ................... 16 Operation Modes and Functions 4. Maintenance and Disassembly ..............23 Maintenance Disassembly 5.
  • Page 3 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Safety Precautions Contents In Case of Accidents or Emergency ..............2 Pre-Installation .......................2 Operation and Maintenance .................2...
  • Page 4 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL To prevent personal injury, or property or unit damage, CAUTION adhere to all precautionary measures and instructions • • While unpacking be careful of sharp edges around outlined in this manual. Before servicing a unit, refer to this the unit as well as the edges of the fins on the con- service manual and its relevant sections.
  • Page 5 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Specifications Contents Model Reference ....................4 Electrical Wiring Diagrams ..................5 Indoor Unit ....................5 Outdoor Unit ....................7...

  • Page 6: Model Reference

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 1. Model Reference Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equipment. Capacity Model Electrical Application VIN310C2V31 208~230V / 60Hz Cooling Only VIN414C2V31 208~230V / 60Hz...

  • Page 7: Electrical Wiring Diagrams

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 2. Electrical Wiring Diagrams Indoor unit Abbreviation Paraphrase Yellow-Green Conductor Positive and Negative Ion Generator Capacitor PLASMA Electronic Dust Collector to CCM Comm.Bus Central Controller (for CAC) X Y E 485 Communication Line LIVE...
  • Page 8 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL NIN413C2V33 , NIN720C2V33, NIN728C2V33 16022000019694 O PTI O N AL Y/ G I O N CN12_1 CN12_2 H EATER CN6_1 CN6_2 OPTIONAL INDOOR WIRING DIAGRAM OPTIONAL w w w . i n n o v a i r . c o m...

  • Page 9: Outdoor Unit

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Outdoor Unit Abbreviation Paraphrase 4-WAY Gas Valve Assembly/4-WAY VALVE AC-FAN Alternating Current FAN DC-FAN Direct Current FAN AC Current Detector COMP Compressor L-PRO Low Pressure Switch H-PRO High Pressure Switch NIN413C2V32 BLUE OR BLACK...
  • Page 10 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL NIN720C2V32 4-WAY HEATER BLACK CN 414 NIN728C2V32 Applicable to Applicable to the units adopting the units adopting DC motor only AC motor only HEATER 2 OPTIONAL： CN30 BLUE YELLOW （ ） OPTIONAL 16022000019211 OUTDOOR WIRING DIAGRAM TO I N D O O R U N I T PO W ER SUPPLY w w w .
  • Page 11 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL PC BOARD for NIN413C2V32 PC BOARD for NIN720C2V32...
  • Page 12 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL PC BOARD for NIN728C2V32 w w w . i n n o v a i r . c o m...
  • Page 13 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL IPM board After power on, LED3(Green color) and LED2(Red color) will be flash if the unit has some problems。 Problems LED3(Green) LED3(Red) IU display standby for normal Operation normally IPM malfunction or IGBT over-strong current...
  • Page 14 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Product Features Contents Operation Modes and Functions ................17 Abbreviation ....................17 Safety Features ....................17 Display Function ..................17 Fan Mode ....................18 Cooling Mode .....................18 Heating Mode (For heat pump models) ............18 Auto-mode ....................19 Drying Mode ....................19 Forced Operation Function ................19...
  • Page 15 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 1. Operation Modes and Functions corresponding error code, allowing for emergency use. • When more than one temperature sensor is malfunctioning, the air conditioner ceases operation. Abbreviation Refrigerant leakage detection Unit element abbreviations This function is active only when mode is selected. It will...
  • Page 16 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Fan Mode F1.If TP3-3<T3< TP3, the compressor will keep running at the current frequency. When fan mode is activated: • When T3< TP3-3, the compressor will not limit the frequency and resume to the former frequency.
  • Page 17 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL • T3 rises above TCDE1°C. • Timer on • T3 maintained above TCDE2°C for 80 seconds. • Timer off • Unit runs for 15 minutes consecutively in defrosting • Changes in: mode. • mode 1.6.5...
  • Page 18 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 1.12 Auto-Restart function unit will beep. This indicates the follow me function is active. • The indoor unit has an auto-restart module that • Once active, the remote control will send a signal allows the unit to restart automatically. The module every 3 minutes, with no beeps.
  • Page 19 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Displayed Displayed code Explanation Meaning Additional Notes value Room temperature 1. All displayed temperatures use actual values. Indoor coil temperature 2. All temperatures are -1F,-1E,-1d,-1c,- -25,-24,-23,-22, displayed in °C regardless Outdoor coil 1b,-1A -21,-20 of remote used.
  • Page 20 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Displayed Displayed code Explanation Meaning Additional Notes value Reserved 0-FF w w w . i n n o v a i r . c o m...

  • Page 21: Table Of Contents

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Maintenance and Disassembly Contents Maintenance ......................24 First Time Installation Check ................24 Refrigerant Recharge ...................26 Re-Installation .....................27 1.3.1 Indoor Unit ..................27 1.3.2 Outdoor Unit ................29 Disassembly ......................31 Indoor Unit ....................31 Outdoor Unit ....................47...

  • Page 22: Maintenance

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 1. Maintenance First Time Installation Check To prevent air and moisture from affecting the air Air and moisture trapped in the refrigerant system affects conditioner’s performance, the indoor unit, as well as the the performance of the air conditioner by: pipes between the indoor and outdoor unit, must be be •...
  • Page 23 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure: • If the pressure does not achieve -0.1 MPa Tighten the flare nuts of the indoor and outdoor (14.5 Psi) after 50 minutes, check for leakage. units, and confirm that both the 2- and 3-way valves are closed.

  • Page 24: Refrigerant Recharge

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Refrigerant Recharge Prior to recharging the refrigerant, confirm the additional amount of refrigerant required using the following table: Models Standard length Max. elevation Max. length Additional refrigerant 9k&12k 7.5m (24.6ft) 10m (32.8ft) 25m (82.0ft) 15g/m (0.16oz/ft)

  • Page 25: Re-Installation

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Re-Installation 1.3.1 Indoor Unit Collecting the refrigerant into the outdoor unit Procedure: Confirm that the 2- and 3-way valves are opened. Operate the air conditioner in cooling mode. Cease operations when the gauge reaches 0.1 MPa Remove the valve stem caps and ensure that the valve (14.5 Psi).
  • Page 26 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Air purging with vacuum pump Procedure: • If the pressure does not achieve -0.1 MPa Tighten the flare nuts of the indoor and outdoor (14.5 Psi) after 50 minutes, check for leakage. units, and confirm that both the 2- and 3-way valves are closed.

  • Page 27: Outdoor Unit

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 1.3.2 Outdoor Unit Evacuation for the whole system Procedure: Close the valve (Low side) on the charge set and turn Confirm that the 2- and 3-way valves are opened. off the vacuum pump. Connect the vacuum pump to the 3-way valve’s Wait a period of five minutes then check whether the service port.
  • Page 28 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Refrigerant charging Procedure: Connect the charge hose to the 3-way service port Open the valves (Low side) on the charge set and and then open the 2- and the 3-way valves. charge the system with liquid refrigerant.

  • Page 29: Disassembly

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 2. Disassembly Indoor unit Front Panel Procedure Illustration 1) Hold the front panel by the tabs on Front Panel the both sides and lift it (see CJ_AB_ INV_001). CJ_AB_INV_001 2) Push up the bottom of an air...
  • Page 30 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 3) Open the horizontal louver and push the hook towards left to open it (see CJ_AB_INV_003). Horizontal Louver Hook CJ_AB_INV_003 4) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver (see CJ_AB_INV_004).
  • Page 31 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 5) Pry the electrical cover by a screw driver, and rotate it towars left, then remove it. (see CJ_AB_INV_005). CJ_AB_INV_005 6) Disconnect the connector for display board. (see CJ_AB_INV_006) . CJ_AB_INV_006 Note: This section is for reference only. Actual unit appearance may vary.
  • Page 32 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 7) Slid the front panel side to side to release each axis (see CJ_AB_INV_007) CJ_AB_INV_007 8) Open the screw cap and then remove the 3 screws (see CJ_AB_INV_008). CJ_AB_INV_008 Note: This section is for reference only. Actual unit appearance may vary.
  • Page 33 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 9) Release the hooks with hands. (see CJ_AB_INV_009) CJ_AB_INV_009 10) Release the 5 hooks in the back (see CJ_AB_INV_010). Hooks CJ_AB_INV_010 11) Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger.
  • Page 34 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 12) Release the 5 hooks of the vertical blades, then pull the vertical blades Hooks rightward and remove it (see CJ_AB_ INV_012). CJ_AB_INV_012 13) Remove 1 screw of the display board. (see CJ_AB_INV_013).
  • Page 35 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Electrical parts (Antistatic gloves must be worn.) Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts. Procedure Illustration Ground Screws 1) Cut the ribbon by a shear, then pull out the coil temperature sensor (T2) (see CJ_AB_INV_014).
  • Page 36 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 4) Remove the fixed devices of the connectors (see CJ_AB_INV_016). CJ_AB_INV_016 CJ_AF_INV_011-1 5) Disconnect the connectors of fan motor, the step motor and the T2 sensor (see CJ_AB_INV_017). CJ_AB_INV_017 6) Open the left side plate of electronic control box (see CJ_AB_INV_018).
  • Page 37 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 7) Open the two clips on the front of the electric box. (see CJ_AB_INV_019) CJ_AB_INV_019 8) Open the upper cover plate of electronic control box (see CJ_AB_ INV_020). CJ_AB_INV_020 Note: This section is for reference only. Actual unit appearance may vary.
  • Page 38 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 9) Remove 1 screw and open the 2 clips along the direction indicated in right image (see CJ_AB_INV_021). CJ_AB_INV_021 Display board 10) Pull out the electrical main board along the direction indicated in right image to remove it (see CJ_AB_ INV_022).
  • Page 39 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Evaporator Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) before disassembling evaporator. Procedure Illustration 1) Disassemble the pipe holder located at the rear of the unit (see CJ_AB_INV_023).
  • Page 40 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 3) Release the hook on the evaporator (see CJ_AB_INV_025). CJ_AB_INV_025 4) Remote the one screw on the evaporator located at the fixed plate (see CJ_AB_ INV_026). CJ_AB_INV_026 5) Pull out the evaporator (see CJ_AB_ INV_027).
  • Page 41 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Fan motor and fan Note: Remove the front panel, electrical parts and evaporator (refer to 1. Front panel, 2. Electrical parts, and 3. Evaporator). before disassembling fan motor and fan. Procedure Illustration 1) Remove the two screws and remove the fixing board of the fan motor (see CJ_AB_ INV_028).
  • Page 42 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 3) Remove the fixing screw (see CJ_AB_ INV_030). 4) Pull out the fan motor and fan assembly from the side. Fixing Screw CJ_AB_INV_030 Note: This section is for reference only. Actual unit appearance may vary.
  • Page 43 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Step motor Note: Remove the front panel and electrical parts (refer to 1. Front panel, 2. Electrical parts) before disassembling step motor. Procedure Illustration 1) Remove the two screws, then remove the stepping motor (see CJ_AB_INV_031).
  • Page 44 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Drain Hose Procedure Illustration 1) Rotate the fixed wire clockwise indicated in right image (see CJ_AB_INV_032). CJ_AB_INV_032 2) Pull up the drain hose to remove it (see CJ_AB_INV_033). CJ_AB_INV_033 Note: This section is for reference only. Actual unit appearance may vary.

  • Page 45: Outdoor Unit

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Outdoor unit Panel Plate NIN413C2V32 Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_B30_INV_001).
  • Page 46 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (8 screws) (see CJ_B30_INV_003). Front Panel CJ_B30_INV_003 5) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_B30_ INV_004).
  • Page 47 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_B30_INV_005). Right Panel CJ_B30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.
  • Page 48 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL NIN720C2V32, Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_CA30_INV_001). CJ_CA30_INV_001 Top Cover...
  • Page 49 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_CA30_INV_003). Front Panel CJ_CA30_INV_003 5) Remove the screws of water collecting Water Collecting Cover cover and then remove the water collecting cover (1 screw) (see CJ_ CA30_INV_004).
  • Page 50 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (6 screws) (see CJ_CA30_INV_005). Right Panel CJ_CA30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.
  • Page 51 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL NIN728C2V32 Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (2 screws) (see CJ_D30_INV_001). Big Handle CJ_D30_INV_001...
  • Page 52 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 4) Remove the screws of the front right panel and then remove the front right panel (2 screws) (see CJ_D30_ INV_003). Front Right Panel CJ_D30_INV_003 5) Remove the screws of the front panel and then remove the front panel (9 screws) (see CJ_D30_INV_004).
  • Page 53 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 6) Remove the screws of water collecting cover and then remove the water collecting cover (2 screw) (see CJ_ D30_INV_005). Water Collecting Cover CJ_D30_INV_005 7) Remove the screws of the right panel and then remove the right panel (8 screws) (see CJ_D30_INV_006).
  • Page 54 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Fan disassembly (Antistatic gloves must be worn when you disassemble the electronic box.) Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. NIN413C2V32, NIN720C2V32 Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_001 ).
  • Page 55 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 5) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_004 ). Fan Motor CJ_ODU_INV_004 6) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_005 ).
  • Page 56 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL NIN728C2V32 Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_006 ). 2) Remove the fan. D-cut CJ_ODU_INV_006 Hook 3) Unfix the hooks and then open the electronic control box cover (4 hooks) (see CJ_ODU_INV_007 ).
  • Page 57 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 4) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_008 ). Fan Motor CJ_ODU_INV_008 5) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_009 ).
  • Page 58 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Electrical parts (Antistatic gloves must be worn.) Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) before disassembling electrical parts. NIN413C2V32, NIN720C2V32 Procedure Illustration 1) Remove the connector for the compressor (see CJ_ODU_INV_010 ).
  • Page 59 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL NIN728C2V32 Procedure Illustration 4-Way Valve 1) Remove the connector for the compressor (see CJ_ODU_INV_011 ). 2) Pull out the two blue wires connected with the four way valve (see CJ_ODU_ Reactor INV_011 ). 3) Pull out connectors of the condenser coil temp.
  • Page 60 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Sound blanket WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling sound blanket.
  • Page 61 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Four-way valve WARNING: Recover refrigerant from the refrigerant circuit before remove the four-way valve. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling four-way valve.
  • Page 62 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Compressor WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling compressor.
  • Page 63 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_INV_016 ). CJ_ODU_INV_016 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_INV_017 ).
  • Page 64 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Troubleshooting Contents Safety Caution .....................71 General Troubleshooting ..................72 Error Diagnosis and Troubleshooting Without Error Code .......74 Remote maintenance ...................74 Field maintenance ..................75 Quick Maintenance by Error Code ..............80 Troubleshooting by Error Code ................81 Common Check Procedures.................81 E0/F4 (EEPROM parameter error) ..............83...
  • Page 65 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Contents 5.10 P1(Over voltage or too low voltage protection diagnosis and solution) ..95 5.11 P2(High temperature protection of IPM module diagnosis and solution) ..96 5.12 P4(Inverter compressor drive error diagnosis and solution) ......97 5.13 P6(Low pressure protection diagnosis and solution) ........99...

  • Page 66: Safety Caution

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 1. Safety Caution WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. Electrolytic Capacitors For other models, connect discharge resistance (approx.100Ω 40W) or a soldering iron plug between the positive and negative terminals of the electrolytic capacitor.

  • Page 67: General Troubleshooting

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the indicator light will flash in a corresponding series, the timer display may turn on or begin flashing, and an error code will be displayed. These error codes are described in the...
  • Page 68 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL For other errors: The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading. Troubleshooting: Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.

  • Page 69: Error Diagnosis And Troubleshooting Without Error Code

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 3. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance.

  • Page 70: Field Maintenance

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Field maintenance Problem Solution Unit will not start Page 78-79 Compressor will not start but fans run Page 78-79 Compressor and condenser (outdoor) fan will not start Page 78-79 Evaporator (indoor) fan will not start...
  • Page 71 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 1.Remote Maintenance Electrical Circuit Refrigerant Circuit Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ Operation is erratic, unpredictable, or unit is unresponsive The tempreture on the playboard cannot be setted ☆...
  • Page 72 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Others ☆ ☆ ☆ ☆ ☆ ☆ ☆ w w w . i n n o v a i r . c o m...
  • Page 73 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Electrical Circuit 2.Field Maintenance Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ ☆ ☆ Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆ Compressor and condenser (outdoor) fan will not start ☆...
  • Page 74 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Refrigerant Circuit Others ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆...

  • Page 75: Quick Maintenance By Error Code

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 4. Quick Maintenance by Error Code If you do not have the time to test whether specific parts are faulty, you can directly change the required parts according the error code. You can find the parts to replace by error code in the following table.

  • Page 76: Troubleshooting By Error Code

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 5. Troubleshooting by Error Code Common Check Procedures 5.1.1 Temperature Sensor Check 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,...
  • Page 77 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 5.1.3 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.

  • Page 78: E0/F4 (Eeprom Parameter Error)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL E0/F4 (EEPROM parameter error) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Indoor PCB • Outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.

  • Page 79: E1 (Indoor And Outdoor Unit Communication Error)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL E1 (Indoor and outdoor unit communication error) Description: The indoor unit has not received feedback from the outdoor unit for 110 seconds, four consecutive times. Recommended parts to prepare: • Indoor PCB • Outdoor PCB •...
  • Page 80 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Remarks: • Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port.

  • Page 81: E2 (Zero Crossing Detection Error Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL E2 (Zero crossing detection error diagnosis and solution) Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. Recommended parts to prepare: •...

  • Page 82: E3/F5 (Fan Speed Has Been Out Of Control Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL E3/F5(Fan speed is operating outside of the normal range) Description: When the indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display the failure(E3). When the outdoor fan speed registers below 200RPM or over 1500RPM for an extended period of time, the unit will stop and the LED will display the failure(F5).
  • Page 83 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Index: 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 84 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 3. Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply) or 50V(115V power supply), the PCB must has problems and need to be replaced.

  • Page 85: E4/E5/F1/F2/F3

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis and solution) Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure. Recommended parts to prepare: •...

  • Page 86: Ec (Refrigerant Leakage Detection Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL EC (Refrigerant Leakage Detection diagnosis and solution) Description: Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the beginning 8 minutes after the compressor starts up, if T2<Tcool-1°C (Tcool-33.8°F) does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes, and this situation happens 3 times, the display area will show “EC”...

  • Page 87: F0(Overload Current Protection Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL F0(Overload current protection diagnosis and solution) Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: • Power supply problems. • System blockage • Faulty PCB •...
  • Page 88 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL P0(IPM malfunction or IGBT over-strong current protection diagnosis and solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows “P0” and the AC turn off.
  • Page 89 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL For 30K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below:...

  • Page 90: P1(Over Voltage Or Too Low Voltage Protection Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 5.10 P1(Over voltage or too low voltage protection diagnosis and solution) Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Recommended parts to prepare: • Power supply issues •...

  • Page 91: P2(High Temperature Protection Of Ipm Module Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 5.11 P2(High temperature protection of IPM module diagnosis and solution) Description: If the temperature of IPM module is higher than setting value, the LED displays this failure code. Recommended parts to prepare: • Faulty PCB •...

  • Page 92: P4(Inverter Compressor Drive Error Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 5.12 P4(Inverter compressor drive error diagnosis and solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on.
  • Page 93 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL For 30K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below:...

  • Page 94: P6(Low Pressure Protection Diagnosis And Solution)

    INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL 5.13 P6(Low pressure protection diagnosis and solution) Description: When the pressure of system reach a certain value, the low pressure protector will switch off. After the pressure resume to normal ,the protection code will disappear.
  • Page 95 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..101 Temperature Sensor Resistance Value Table for TP (°C --K) ......102 ∆T(°F)=(9∆T(°C))/5 ....................103 iii) Pressure On Service Port ...................104...
  • Page 96 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL i) Temperature Sensor Resistance Value Table for T1,T2,T3 and 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...
  • Page 97 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL ii) Temperature Sensor Resistance Value Table for TP (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C...
  • Page 98 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL iii) ∆T(°F)=(9∆T(°C))/5 °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 129.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8...
  • Page 99 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL iv) Pressure On Service Port(R410A) Cooling chart: °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) 70/59 10.1 10.6 75/63 10.7 11.2 80/67 11.2 11.9 90/73 10.5 10.3 10.0 10.6 12.4 13.0...
  • Page 100 INNOVAIR DC INVERTER NEXXOS SERVICE MANUAL Heating chart: 57/53 47/43 37/33 27/23 17/13 (-8.33/- 0/-2 -17/-18 °F(°C) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) 10.56) (-17/-19) (-27/-28) 30.3 28.5 25.3 22.8 20.8 18.5 16.5 32.5 30.0 26.6 25.4 23.3 20.5 19.0 33.8 31.5 27.8...

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