Midea MSMTAU-09HRFN8-QRD6GW Service Manual
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Midea MSMTAU-09HRFN8-QRD6GW Service Manual

Ultimate comfort 3d inverter series
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Ultimate Comfort 3D Inverter Series
Service Manual 2017
R32

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Summary of Contents for Midea MSMTAU-09HRFN8-QRD6GW

  • Page 1 Ultimate Comfort 3D Inverter Series Service Manual 2017...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................1   1.1 Safety Precaution ........................1  1.2 Warning ............................1  2 Information servicing ........................... 4   3. Model List ..............................8   4. Dimension ..............................9   4.1 Indoor Unit ........................... 9  4.2 Outdoor Unit ..........................11  5.

  • 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. A bad connection may cause water leakage. disconnect the power supply cable. 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 is operated.  Do not drink the water drained from the product.  Use a firm stool or ladder when cleaning or maintaining the product. Be careful and avoid personal injury.  Replace the all batteries in the remote control with new ones of the same type.

  • Page 6: Information Servicing

    risk of fire or explosion. All possible ignition 2 Information servicing sources, including cigarette smoking, should be kept sufficiently far away from the site of 1.Checks to the area installation, repairing, removing and disposal, Prior to beginning work on systems containing during which flammable refrigerant can flammable refrigerants, safety checks are possibly be released to the surrounding space.
  • Page 7 materials which are inherently resistant to being flammable atmospheres. Replacement parts corroded or are suitably protected against being shall be in accordance with the manufacturer's so corroded. specifications. NOTE: The use of silicon sealant may inhibit 9. Checks to electrical devices Repair maintenance electrical...
  • Page 8 suitable for the refrigerant used. Leak detection OFN charge is used, the system shall be equipment shall be set at a percentage of the vented down to atmospheric pressure to enable LFL of the refrigerant and shall be calibrated to work to take place.
  • Page 9 mechanical handling equipment is available, to be used are designated for the recovered   if required, for handling refrigerant cylinders; refrigerant and labelled for that refrigerant (i.e. personal protective equipment special cylinders for the recovery of refrigerant).   available and being used correctly;...

  • Page 10: Model List

    3. Model List Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units 3D inverter MSMTAU-09HRFN8-QRD6GW MOB01-09HFN8-QRD6GW MSMTAU-12HRFN8-QRD6GW MOB01-12HFN8-QRD6GW...

  • Page 11: Dimension

    4. Dimension 4.1 Indoor Unit Model MSMTAU-09HRFN8-QRD6GW MSMTAU-12HRFN8-QRD6GW...
  • Page 12 For MSMTAU-09HRFN8-QRD6GW, MSMTAU-12HRFN8-QRD6GW...

  • Page 13: Outdoor Unit

    4.2 Outdoor Unit More than 30cm More than 60cm (Service space More than 30cm More than 60cm More than 200cm...
  • Page 14 For MOB01-09HFN8-QRD6GW, MOB01-12HFN8-QRD6GW 815 W3 514 W1 333 D 800 W 70 W2 62 B1 D2 D3 20 A1 61.6 A2...

  • Page 15: Refrigerant Cycle Diagram

    5. Refrigerant Cycle Diagram INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) T1 Room temp. sensor T2 Evaporator temp. sensor GAS SIDE 4-WAY VALVE 3-WAY VALVE ACCUMULATOR COOLING COMPRESSOR HEATING...

  • Page 16: Installation Details

    6 Installation Details 6.1 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) 6.2 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) >3 and ≤6...

  • Page 17: Pipe Length And The Elevation

    Elevation Length refrigerant Liquid B (m) A (m) (g/m) 3/8’’ 1/4’’ MSMTAU-09HRFN8-QRD6GW+MOB01-09HFN8-QRD6GW (Ф9.52) (Ф6.35) 3/8’’ 1/4’’ MSMTAU-12HRFN8-QRD6GW+MOB01-12HFN8-QRD6GW (Ф9.52) (Ф6.35) Caution: The capacity test is based on the standard length and the maximum permissive length is based on the system reliability.

  • Page 18: Installation For The First Time

    connection to the vacuum pump. 6.4 Installation for the first time 4) Fully open the handle Lo of the manifold valve. Air and moisture in the refrigerant system have 5) Operate the vacuum pump to evacuate. undesirable effects as below: 6) Make evacuation for 30 minutes and check ●...

  • Page 19: Adding The Refrigerant After Running The System For Many Years

    disconnected from the vacuum pump to the liquid charge. valve at the bottom of the cylinder. If the 2). Purge the air from the charge hose. refrigerant is R410A, make the cylinder bottom Open the valve at the bottom of the cylinder up to ensure the liquid charge.

  • Page 20: Re-Installation While The Outdoor Unit Need To Be Repaired

    Be sure to use a hexagonal wrench to operate the valve. valve stems. 5) Operate the vacuum pump to evacuate. 2). Connect the charge hose with the push pin of 6) Make evacuation for 30 minutes and check handle lo to the 3-way valves gas service port. whether compound meter...
  • Page 21 Confirm that the compound meter indicates 5).When the electronic scale displays the proper -0.1Mpa. weight, disconnect the charge hose from the 4). Close the valve (Low side) on the charge set, 3-way valve’s service port immediately turn off the vacuum pump, and confirm that the If the system has been charged with liquid gauge needle does not move (approximately 5 refrigerant while operating the air conditioner,...

  • Page 22: Operation Characteristics

    7. Operation Characteristics Mode Cooling operation Heating operation Drying operation Temperature 16℃~32℃ 0℃~30℃ 10℃~32℃ Room temperature (60℉~90℉) (32℉~86℉) (50℉~90℉) 0℃~50℃ -15℃~30℃ 0℃~50℃ Outdoor temperature (32℉~122℉) (5℉~86℉) (32℉~122℉) -15℃~50℃ (5℉~122℉) (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 23: Wiring Diagram

    8. Wiring Diagram 8.1 Indoor Unit MSMTAU-09HRFN8-QRD6GW, MSMTAU-12HRFN8-QRD6GW...

  • Page 24: Outdoor Unit

    8.2 Outdoor Unit MOB01-09HFN8-QRD6GW, MOB01-12HFN8-QRD6GW...

  • Page 25: Electronic Function

    feature is cancelled. 9. Electronic function Dispalys ‘ ’ under deforsting operation. 9.1 Abbreviation Dispalys ‘ ’ when anti-cold air feature is T1: Indoor room temperature activated under heating mode. T2: Coil temperature of evaporator T3: Coil temperature of condenser Dispalys ‘...

  • Page 26: Main Protection

    conditioner continues operation and displays the 9.3 Main Protection corresponding error code, allowing for emergency 9.3.1 Compressor three-minute delay at use. restart When more than one temperature sensor is Compressor functions are delayed for up to ten malfunctioning, the air conditioner ceases seconds upon the first startup of the unit, and are operation.

  • Page 27: Operation Modes And Functions

    to ten minutes. 9.4 Operation Modes and Functions When T1 is lower than or equal to • 9.4.1 Fan mode (Tsc-CDIFTEMP). 1. When fan mode is activated: 1.3 If one of the following conditions is -The outdoor fan and compressor are stopped. satisfied, not judge protective time.
  • Page 28 fan speed reduces to 40%; 9.4.3 Heating Mode 9.4.3.1 Compressor Control -When T1-Tsc is lower than or equal to 0°C, fan speed reduces to 20%; 1.Reach the configured temperature -When T1-Tsc is lower than or equal to -0.5°C, 1.1 If the following conditions are satisfied, the fan speed reduces to 1%.
  • Page 29 2. Auto fan defrosting mode. 2.1 Rise curve -When T1-Tsc is higher than -1.5°C, fan 9.4.3.5 Evaporator Coil Temperature speed reduces to 80%; Protection -When T1-Tsc is higher than 0°C, fan speed reduces to 60%; -When T1-Tsc is higher than 0.5°C, fan Decrease speed reduces to 40%;...
  • Page 30 time, and then turn off automatically when fan in cooling mode. reaching the setting “off” time. Mute function is active. 5.Timer off/on. The machine will turn off automatically when reaching the setting “off” All protections are activated and operate the time, and then turn on automatically when same as they do that in cooling mode.
  • Page 31 module automatically stores the current settings 4.When there’s any one temperature sensor in and, in the case of a sudden power failure, will malfunction, the AC will quit ECO mode . 5.Indoor fan will run at auto fan when enter into restore those setting automatically within 3 the ECO mode .The setting temp.
  • Page 32 9.4.16 Electrical energy consumption control function Press the “Gear” button on remote controller to enter the energy efficient mode in a sequence of following: Turn off the unit or activate ECO, sleep, Super cool, Silence or self clean function will quit this function.
  • Page 33 9.4.19 Information Inquiry To enter information inquiry status, complete the following procedure within ten seconds: Press LED 3 times. Press SWING 3 times. If you are successful, you will hear beeps for two seconds. Use the LED and SWING buttons to cycle through information displayed. Pressing LED will display the next code in the sequence.

  • Page 34: Troubleshooting

    10. 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 35: Indoor Unit Error Display

    10.1 Indoor Unit Error Display Display LED STATUS E0/EA Indoor unit EEPROM parameter error Indoor / outdoor units communication error Indoor fan speed is operating outside of the normal range Indoor room temperature sensor T1 open circuit or short circuit Evaporator coil temperature sensor T2 open circuit or short circuit Refrigerant leakage detection Communication error between the indoor PCB and display board...

  • Page 36: Trouble Shooting

    10.2 Trouble shooting 10.2.1 EEPROM parameter error diagnosis and solution(E0/F4) E0/F4/EA 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: EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.
  • Page 37 10.2.2 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 110 seconds and this condition happens four times continuously. Supposed causes Wiring mistake ● Indoor or outdoor PCB faulty ●...
  • Page 38 Remark: 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. When AC is normal running, the voltage is moving alternately as positive values and negative values If the outdoor unit has malfunction, the...
  • Page 39 10.2.3 Fan speed is operating outside of the normal range diagnosis and solution(E3/F5) E3/F5 Error Code Malfunction decision When indoor fan speed keeps too low (300RPM) or too high conditions (1500RPM) for certain time, the unit will stop and the LED will display the failure.
  • 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 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 42 10.2.4 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 10.2.5 Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3) 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. Wiring mistake ● Supposed causes Sensor faulty ●...
  • Page 44 10.2.6 Communication error between the indoor PCB and display board (Eb) Error Code Malfunction decision Indoor PCB does not receive feedback from Display board. conditions Supposed causes Wiring mistake ● PCB faulty ● Display board malfunction ● Trouble shooting:...
  • Page 45 10.2.7 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 46 10.2.8 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. Supposed causes Wiring mistake ●...
  • Page 47 10.2.9 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 48 10.2.10 High temperature protection of IPM diagnosis and solution (P2) Error Code Malfunction decision If the temperature of IPM module is higher than limited value, the conditions LED will display the failure. Supposed causes IPM radiator problem ● PCB faulty ●...
  • Page 49 10.2.11 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 50 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 51 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (°C--K) °C °F °C °F °C °F °C °F K Ohm K Ohm K Ohm K Ohm 115.266 12.6431 2.35774 0.62973 109.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865...
  • Page 52 Appendix 2 Temperature Sensor Resistance Value Table for T5 (°C --K) °C °F °C °F °C °F °C °F K Ohm K Ohm K Ohm K Ohm 542.7 69.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5...
  • Page 53 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...

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