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NEXXOS INVERTER
SERVICE MANUAL
INVERTER MINI SPLIT SYSTEM
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.
NIN516C2V31
NIN522C2V31
NIN1225C2V31
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Table of Contents
Troubleshooting
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Summary of Contents for innovair NIN522C2V31
- Page 1 NEXXOS INVERTER SERVICE MANUAL NIN516C2V31 NIN522C2V31 NIN1225C2V31 INVERTER MINI SPLIT SYSTEM 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 ...
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Page 2: Table Of Contents
Innovair Corporation Nexxos Inverter CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution .......................... 1 1.2 Warning ............................1 2. Part Names And Functions ......................... 3 2.1 Model Names of Indoor/Outdoor units ..................3 2.2 Part names of Indoor/Outdoor units ....................4 3. -
Page 3: Precaution
Innovair Corporation Nexxos Inverter with age. 1. Precaution If the base collapses, the air conditioner could fall with it, causing property damage, product 1.1 Safety Precaution failure, and personal injury. To prevent injury to the user or other people and... - Page 4 Innovair Corporation Nexxos Inverter Operational Be caution that water could not enter the product. There is risk of fire, electric shock, or product Do not expose the skin directly to cool air for long damage. time. (Do not sit in the draft).
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Page 5: Part Names And Functions
Innovair Corporation Nexxos Inverter 2. Part Names And Functions 2.1 Model Names of Indoor/Outdoor units Capacity Indoor units Outdoor units NIN516C2V31(ID) NIN516C2V31(OD) NIN522C2V31(ID) NIN522C2V31(OD) NIN1225C2V31(ID) NIN1225C2V31(OD) -
Page 6: Part Names Of Indoor/Outdoor Units
Innovair Corporation Nexxos Inverter 2.2 Part names of Indoor/Outdoor units... -
Page 7: Dimension
Innovair Corporation Nexxos Inverter 3. Dimension 3.1 Indoor Unit Model 920mm 223mm 292mm NIN516C2V31(ID) (36.22in) (8.78in) (10.5in) 998mm 240mm 322mm NIN522C2V31(ID) (39.29in) (9.45in) (12.68in) - Page 8 Innovair Corporation Nexxos Inverter Model Dimension of installation hole 185mm 150mm 45mm Φ65mm NIN516C2V31(ID) (2.56in) (7.28in) (5.91in) (1.77in) Model Dimension of installation hole 120mm 100mm 45mm Φ65mm NIN522C2V31(ID) (2.56in) (4.72in) (3.94in) (1.77in)
- Page 9 Innovair Corporation Nexxos Inverter Model 1450mm 265mm 340mm NIN1225C2V31(ID) (57.1in) (10.43in) (10.39in)
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Page 10: Outdoor Unit
Innovair Corporation Nexxos Inverter 3.2 Outdoor Unit More than 30cm(11.8in) More than 60cm(23.6in) (Service space) More than 30cm(11.8in) More than 60cm(23.6in) More than 70cm(27.6in) Note: The above drawing is only for reference. The appearance of your units may be different. -
Page 11: Refrigerant Cycle Diagram
Innovair Corporation Nexxos Inverter 4. Refrigerant Cycle Diagram For cooling only models: INDOOR OUTDOOR LIQUID SIDE CAPILIARY TUBE T3 Condenser temp. sensor HEAT EXCHANGE (EVAPORATOR) HEAT T1 Room temp. T4 Ambient EXCHANGE sensor temp. sensor (CONDENSER) T2 Evaporator temp. sensor T5 Discharge temp. - Page 12 Innovair Corporation Nexxos Inverter For heat pump models: INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE T3 Condenser temp. sensor CAPILIARY TUBE HEAT EXCHANGE HEAT (EVAPORATOR) T4 Ambient T1 Room temp. EXCHANGE temp. sensor sensor (CONDENSER) T2 Evaporator temp.
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Page 13: Wiring Diagram
Innovair Corporation Nexxos Inverter 5.1 Indoor Unit 5. Wiring Diagram NIN516C2V31(ID) - Page 14 Innovair Corporation Nexxos Inverter NIN522C2V31(ID)
- Page 15 Innovair Corporation Nexxos Inverter NIN1225C2V31(ID)
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Page 16: Outdoor Unit
Innovair Corporation Nexxos Inverter 5.2 Outdoor Unit NIN516C2V31(OD) - Page 17 Innovair Corporation Nexxos Inverter NIN522C2V31(OD)
- Page 18 Innovair Corporation Nexxos Inverter NIN1225C2V31(OD)
- Page 19 Innovair Corporation Nexxos Inverter For NIN516C2V31(OD)
- Page 20 Innovair Corporation Nexxos Inverter For NIN522C2V31(OD)
- Page 21 Innovair Corporation Nexxos Inverter For NIN1225C2V31(OD)
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Page 22: Installation Details
Please refer to the nameplate before selecting the cable, fuse and switch. 6.3 Pipe length and the elevation Pipe size Models Liquid 1/2in 1/4in NIN516C2V31(ID)+ NIN516C2V31(OD) (Ф12.7mm) (Ф6.35mm) 1/2in 1/4in NIN522C2V31(ID)+ NIN522C2V31(OD) (Ф12.7mm) (Ф6.35mm) 5/8in 3/8in NIN1225C2V31(ID)+ NIN1225C2V31(OD) (Ф15.9mm) (Ф9.52mm) - Page 23 Innovair Corporation Nexxos Inverter Max. Standard Max. Additional Models Length length Elevation refrigerant 7.5m 15g/m NIN516C2V31(ID)+ NIN516C2V31(OD) (24.6ft) (32.8ft) (82.0ft) (0.16oz/ft) 7.5m 30g/m NIN522C2V31(ID)+ NIN522C2V31(OD) (24.6ft) (65.6ft) (98.4ft) (0.32oz/ft) 7.5m 30g/m NIN1225C2V31(ID)+ NIN1225C2V31(OD) (24.6ft) (82.0ft) (164ft) (0.32oz/ft)
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Page 24: Installation For The First Time
Innovair Corporation Nexxos Inverter 4) Fully open the handle Lo of the manifold valve. 6.4 Installation for the first time 5) Operate the vacuum pump to evacuate. Air and moisture in the refrigerant system have 6) Make evacuation for 30 minutes and check... -
Page 25: Adding The Refrigerant After Running The System For Many Years
Innovair Corporation Nexxos Inverter 3 times. 3) Put the charging cylinder onto the electronic After purging the air, use a torque wrench to scale and record the weight. tighten the flare nut on the 2-way valve. 4) Operate the air conditioner at the cooling 4). -
Page 26: Re-Installation While The Outdoor Unit Need To Be Repaired
Innovair Corporation Nexxos Inverter 4). Set the 2-way valve to the close position. 6). Disconnect the charge set and the charging 5). Operate the air conditioner at the cooling cylinder, and set the 2-way and 3-way valves to cycle and stop it when the gauge indicates the open position 0.1Mpa(14.5Psi). - Page 27 Innovair Corporation Nexxos Inverter to check for gas leakage. 2. Refrigerant charging Procedure: 1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.
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Page 28: Operation Characteristics
Innovair Corporation Nexxos Inverter 7. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode ≥17℃ ≤30℃ ＞10℃ Room temperature (62℉) (86℉) (50℉) 0℃～50℃ (32℉～122℉) -15℃～30℃ 0℃～50℃ -15℃～50℃ Outdoor temperature (5℉～86℉) (32℉～122℉) (5℉～122℉) (For the models with low temperature cooling system) -
Page 29: Electronic Function
Innovair Corporation Nexxos Inverter 8. Electronic Function 8.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature 8.2 Display function 8.2.1 Icon explanation on indoor display board. -
Page 30: Main Protection
Innovair Corporation Nexxos Inverter 8.3 Main Protection Preheating mode: A weak current flow through the coil of 8.3.1 Three minutes delay at restart for compressor from the wiring terminal of the compressor compressor, then the compressor is heated 1 minute delay for the 1 time stand-up and 3 without operation. -
Page 31: Operation Modes And Functions
(3) Indoor fan can be set to high/med/low/auto. Fmax=F4 (4) The louver operates same as in cooling mode. (5) Auto fan: Fmax=F7 NIN516C2V31(ID), models: NIN522C2V31, NIN1225C2V31 Fmax=F8 T1-24 (H-L)*0.75+L Fmax=F6 (H-L)*0.5+L (H-L)*0.25+L Fmax=F3 Fmax: The maximum operation frequency of 8.4.2 Cooling Mode compressor. - Page 32 Hold: Keep the current frequency. medium, low, auto. Resume: No limitation for frequency. Note: NIN522C2V31、NIN1225C2V31 , When AC is in “hold” zone for 3 minutes, the models: compressor frequency will rise to the higher When the compressor is running, the indoor fan level.(frequency will increase twice at most)
- Page 33 Innovair Corporation Nexxos Inverter resume until room temperature exceeds 12℃. 8.4.3.4 Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit frequency limit are active and the same as that in cooling mode. 8.4.3.5 The outdoor fan operates the same as in cooling mode.
- Page 34 Innovair Corporation Nexxos Inverter “timer off” function. And when reaching the auto-restart module. In case of a sudden power setting time, the timer LED will be off and the failure, the module memorizes the setting AC running mode has not been changed.
- Page 35 Innovair Corporation Nexxos Inverter With this new technology, the display area will mode, the louver will restore to the default show “EC” when the outdoor unit detects angle. refrigerant leakage. 8.4.12 Silence operation(optional) 8.4.11 Louver Position Memory Function Press the “silence” button on remote controller When starting the unit again after shutting down, to initiate SILENCE function.
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Page 36: Troubleshooting
Innovair Corporation Nexxos Inverter 9. 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 37: Indoor Unit Error Display
Innovair Corporation Nexxos Inverter 9.1 Indoor Unit Error Display For NIN1225C2V31(ID) Display LED STATUS Indoor unit EEPROM parameter error Indoor / outdoor units communication error Zero crossing signal detection error(for NIN516C2V31(ID)) Indoor unit fan speed has been out of control... - Page 38 Innovair Corporation Nexxos Inverter For NIN516C2V31, NIN522C2V31 (ID) Display LED STATUS Indoor unit EEPROM parameter error Indoor / outdoor units communication error Zero crossing signal detection error(except 3D inverter models) Indoor unit fan speed has been out of control Indoor room temperature sensor open circuit or short circuit...
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Page 39: Outdoor Unit Error Display
Innovair Corporation Nexxos Inverter 9.2 Outdoor unit error display For NIN516C2V31(OD) - Page 40 Innovair Corporation Nexxos Inverter For NIN1225C2V31(OD) LED1 (standby) Flashing once per second(low speed flashing) (error) Flashing once per half second (high speed flashing) (running) aways on CN38 IC18 CN24 CN22 CN19 CN18 R111 R112 R114 R113 IC17 IC32 CN37 DC MOTOR...
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Page 41: Trouble Shooting
Innovair Corporation Nexxos Inverter 9.3 Trouble shooting 9.3.1 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 ●... - Page 42 Innovair Corporation Nexxos Inverter 9.3.2 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 110 seconds and this condition happens four times continuously. Supposed causes Wiring mistake ●...
- Page 43 Innovair Corporation Nexxos Inverter Remark: Use a multimeter to test the DC voltage between L2 port and S port of outdoor unit. The red pin of multimeter connects with L2 port while the black pin is for S port. When AC is normal running, the voltage will move alternately between -50V to 50V.
- Page 44 Innovair Corporation Nexxos Inverter 9.3.3 Zero crossing detection error diagnosis and solution(E2) Error Code Malfunction decision When PCB does not receive zero crossing signal feedback for 4 conditions minutes or the zero crossing signal time interval is abnormal. Supposed causes Connection mistake ●...
- Page 45 Innovair Corporation Nexxos Inverter 9.3.4 Fan speed has been out of control diagnosis and solution(E3/E7/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.
- Page 46 Innovair Corporation Nexxos Inverter Index 1: 1.Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Measure the resistance value of each winding by using the tester. If any resistance value is zero, the fan motor must has problems and need to be replaced.
- Page 47 Innovair Corporation Nexxos Inverter 9.3.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5) 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 ●...
- Page 48 Innovair Corporation Nexxos Inverter 9.3.6 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 conditions is abnormal, the display LED will show “P0” and AC will turn off.
- Page 49 Innovair Corporation Nexxos Inverter...
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- Page 51 Innovair Corporation Nexxos Inverter 9.3.7 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 ●...
- Page 52 Innovair Corporation Nexxos Inverter 9.3.8 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.
- Page 53 Innovair Corporation Nexxos Inverter 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.
- Page 54 Innovair Corporation Nexxos Inverter Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (℃--K) K Ohm K Ohm K Ohm K Ohm ℃ ℉ ℃ ℉ ℃ ℉ ℃ ℉ 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073...
- Page 55 Innovair Corporation Nexxos Inverter Appendix 2 Temperature Sensor Resistance Value Table for T5 (℃--K) K Ohm K Ohm K Ohm K Ohm ℃ ℉ ℃ ℉ ℃ ℉ ℃ ℉ 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492...
- Page 56 Innovair Corporation Nexxos Inverter Appendix 3: 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 ℃ 50 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 ℉...
- Page 57 Innovair Corporation Nexxos Inverter 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value DA108X1C-20FZ3 ASN108D22UEZ DA130M1C-31FZ DA150S1C-20FZ DA250S2C-30MT Blue - Red 0.71Ω 1.57Ω 1.77Ω 0.95Ω 0.55Ω Blue - Black (20℃/68℉) (20℃/68℉) (20℃/68℉) (20℃/68℉) (20℃/68℉)
- Page 58 Innovair Corporation Nexxos Inverter 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. Digital tester...
- Page 59 Innovair Corporation Nexxos Inverter 5: Pressure On Service Port Cooling chart: ℉ (℃) （23.89） （29.44） （35） （40.56） （46.11） 70/59 10.1 75/63 10.7 80/67 11.2 ℉ (℃) （23.89） （29.44） （35） （40.56） （46.11） 70/59 75/63 80/67 ℉ (℃) （23.89） （29.44） （35） （40.56）...
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Page 60: Disassembly Instructions
Innovair Corporation Nexxos Inverter 10 Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine. 10.1 Indoor unit Parts name Procedures Remarks Front panel How to remove the front Overview: panel. Pull the below side of the panel and release the clips. - Page 61 Innovair Corporation Nexxos Inverter Electrical How to remove the Coil temp. Grounding sensor screws parts electrical parts. After remove the front panel from procedure 1, pull out the room temp. sensor and evaporator coil sensor. Room temp. sensor Remove the grounding Screw for cover screws.
- Page 62 Innovair Corporation Nexxos Inverter Evaporator remove evaporator. 1) After remove the front panel ass’y and electrical parts following procedure 1 and procedure 2, remove the pipe holder at the rear side of the unit. Screw of pipe holder 2) Remove the three screws on the evaporator at the base bearing side.
- Page 63 Innovair Corporation Nexxos Inverter Fan and How to remove the fan motor and motor. After remove the evaporator ass’y following procedure 1, procedure 2 and procedure 3, remove the four screws fixing the Four screws cover Remove the screw fixing the motor and then pull out the motor.
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Page 64: Outdoor Unit
Innovair Corporation Nexxos Inverter 10.2 Outdoor unit NIN516C2V31(OD) Part name Procedures Remarks Panel plate How to remove the panel plate. Screws of top panel Stop operation of the air conditioner and turn “OFF” the power breaker. Refer to the right side photos, find out the fixing screws of the panels. - Page 65 Innovair Corporation Nexxos Inverter Remove the screws of the front panel, including Screw of the fixing screws of motor the top holder and then remove panel the front panel. Screws of right rear plate Remove the screws of the right side plate and remove the right side plate.
- Page 66 Innovair Corporation Nexxos Inverter Fan ass’y How to remove the fan Electronic control box ass’y. Fan ass’y After remove the panel plate following procedure 1, remove the hex nut fixing the fan and then remove the fan. Reactor Compressor and liquid-gas separator...
- Page 67 Innovair Corporation Nexxos Inverter Disconnect the connector for fan motor from the electronic control board. Fan motor connector Four Remove the four screws fixing screws of the fan motor. 5) Then remove the fan motor. Electrical How to remove the parts electrical parts.
- Page 68 Innovair Corporation Nexxos Inverter Pull out the two black wires connected with the four way valve. Two black wires of four way valve Pull out connectors of the compressor top temp. sensor, condenser coil temp. sensor(T3),outdoor ambient temp. sensor(T4) and discharge temp.
- Page 69 Innovair Corporation Nexxos Inverter Four-way How to remove the valve four-way valve. The picture of four-way valve may be different from Perform work of item the one on your side. 1,2,3. Recover refrigerant Four-way from the refrigerant circuit. valve Remove the screw of...
- Page 70 Innovair Corporation Nexxos Inverter NIN522C2V31(OD) Part name Procedures Remarks Panel plate How to remove the panel plate. Screws of top panel 1) Stop operation of the air conditioner and turn “OFF” the power breaker. 2) Refer to the right side photos, find out the fixing screws of the panels.
- Page 71 Innovair Corporation Nexxos Inverter Screw of Remove the screws of the top the front panel, including panel the fixing screws of motor holder and then remove the front panel. Screws of right rear plate Screw of top panel Remove the screws of...
- Page 72 Innovair Corporation Nexxos Inverter Fan ass’y How to remove the fan Electronic control box ass’y. 1) After remove the panel plate following procedure 1, remove the hex nut fixing the fan and then remove the fan. Two reactors Compressor and...
- Page 73 Innovair Corporation Nexxos Inverter 3) Release the fan motor Fan motor connector connector and four way Four way valve valve connector. connector 4) Remove the four fixing screws of the fan motor. 5) Then remove the fan Four screws motor.
- Page 74 Innovair Corporation Nexxos Inverter 2) Release the three temp. sensor connectors. 3) Remove the connector of reactor. 4) Remove the connector of electronic expansion valve. 5) Remove the grounding screw. 6) Remove the power supply wires(L1,L2,S). 7) Then remove the...
- Page 75 Innovair Corporation Nexxos Inverter Four-way How to remove the valve The picture of four-way valve may be different from four-way valve. the one on your side. 1) Perform work of Four-way item1,2,3. valve 2) Recover refrigerant Welded from the refrigerant circuit.
- Page 76 Innovair Corporation Nexxos Inverter NIN1225C2V31(OD) Part name Procedures Remarks Panel plate How to remove the panel plate. Screws of top panel 1) Stop operation of the air conditioner and turn “OFF” the power breaker. 2) Refer to the right side photos, find out the fixing screws of the panels.
- Page 77 Innovair Corporation Nexxos Inverter Remove the screws of the front panel, including the fixing screws of motor holder and then remove Screw of the top panel the front panel. Remove the screws of the right side plate and remove the right side Screws of right rear plate plate.
- Page 78 Innovair Corporation Nexxos Inverter...
- Page 79 Innovair Corporation Nexxos Inverter Fan ass’y How to remove the fan LAK board(optional) Electronic control box ass’y. 1) After remove the panel plate following procedure 1, remove the hex nut fixing the fan and then remove the fan. Accumulator Three reactors...
- Page 80 Innovair Corporation Nexxos Inverter Disconnect the connector for fan motor from the electronic control board. Fan motor connector Remove the four fixing screws of the fan motor. 5) Then remove the fan Four screws motor. Electrical How to remove the parts electrical parts.
- Page 81 Innovair Corporation Nexxos Inverter 3) Pull out connectors of the compressor top temp. sensor, condenser coil temp. sensor(T3),outdoor ambient temp. sensor(T4) and discharge temp. sensor(T5). Four temp. sensor connectors 4) Remove the grounding screw. Grounding screw 5) Remove the power supply wires(L1,L2,S).
- Page 82 Innovair Corporation Nexxos Inverter Four-way How to remove the valve four-way valve. The picture of four-way valve may be different from 1) Perform work of the one on your side. item1,2,3. 2) Recover refrigerant Four-way from the refrigerant circuit. valve...