Midea MSX-07HRN1-QC2 Service Manual
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Midea MSX-07HRN1-QC2 Service Manual

Midea MSX-07HRN1-QC2 Service Manual

Midea airconditioner europe market split wall-mounted type x on-off series
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XSEU-A-1202

SERVICE MANUAL

MIDEA AIRCONDITIONER
EUROPE MARKET
SPLIT WALL-MOUNTED TYPE
X ON-OFF SERIES

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Summary of Contents for Midea MSX-07HRN1-QC2

  • Page 1: Service Manual

    XSEU-A-1202 SERVICE MANUAL MIDEA AIRCONDITIONER EUROPE MARKET SPLIT WALL-MOUNTED TYPE X ON-OFF SERIES...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution .............................. 1 1.1 Safety Precaution .......................... 1 1.2 Warning ............................1 2. Function ..............................6 3. Dimension............................... 9 3.1 Indoor Units ........................... 9 3.2 Outdoor Units ..........................11 4. Refrigerant Cycle Diagram ........................12 5. Wiring Diagram ............................. 13 5.1 Indoor Units ..........................

  • Page 3: Precaution

    1. Precaution 1.1 Safety Precaution To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first. 1.2 Warning Ø...
  • Page 4 condenser and evaporator. For installation, always contact the dealer or an Authorized service center. There is risk of fire, electric shock, explosion, or injury. Do not install the product on a defective installation stand. It may cause injury, accident, or damage to the product. Be sure the installation area does not deteriorate with age.
  • Page 5 There is risk of explosion or fire. If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable. There is risk of electric shock or fire. Stop operation and close the window in storm or hurricane. If possible, remove the product from the window before the hurricane arrives.
  • Page 6 It can avoid vibration of water leakage. Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods. It may cause a problem for your neighbors. Use two or more people to lift and transport the product. Avoid personal injury.
  • Page 7 operated. There are sharp and moving parts that could cause personal injury. Do not drink the water drained from the product. It is not sanitary could cause serious health issues. Use a firm stool or ladder when cleaning or maintaining the product. Be careful and avoid personal injury.

  • Page 8: Function

    2. Function Model Names of Indoor/Outdoor Units Series Capacity Indoor units Outdoor units MSX-07HRN1-QC2 MOA-07HN1-QC2 MSX-09HRN1-QC2 MOA-09HN1-QC2 MSX-09HRN1-QC2 MOA1-09HN1-QC2 MSX-12HRN1-QC2 MOB1-12HN1-QC2 On-Off MSX-12HRN1-QC2 MOB-12HN1-QC2 MSX-18HRN1-QC2 MOF-18HN1-QC2 MSX-21HRN1-QB8W MOF1-21HN1-QB8W MSX-24HRN1-QB8W MOF3-24HN1-QB8W...
  • Page 9 Indoor units LCD display Operation by remote controller. Golden fin (Optional) Anti-freezing control in cooling Prevent the water being frozen on evaporator by checking the evaporator pipe temperature Ionizer/Plasma(optional) Time Delay Safety control Sleep mode auto control Indoor fan speed control Turbo wind, high, med, low, breeze.
  • Page 10 Outdoor units Power relay control Low noise air flow system Anti-rust cabinet Made from electrolytic zinc steel sheet and anti-rust coated components. Valve protection cover It protects the valves and prevents water from dripping.

  • Page 11: Dimension

    3. Dimension 3.1 Indoor Units Figure 1: Figure 2:...
  • Page 12 Figure 3: Figure 4: Figure Models MSX-07HRN1-QC2 Figure 1 MSX-09HRN1-QC2 Figure 2 MSX-12HRN1-QC2 Figure 3 MSX-18HRN1-QC2 MSX-21HRN1-QB8W Figure 4 MSX-24HRN1-QB8W...

  • Page 13: Outdoor Units

    3.2 Outdoor Units More than 30cm More than 60cm (Service space More than 30cm More than 60cm More than 70cm Model MOA-07HN1-QC2 MOA1-09HN1-QC2 MOA-09HN1-QC2 MOB1-12HN1-QC2 MOB-12HN1-QC2 MOF-18HN1-QC2 MOF1-21HN1-QB8W MOF3-24HN1-QB8W...

  • Page 14: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram For heat pump models: INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE REVERSING VALVE 3-WAY VALVE (Heating Model only) ACCUMULATOR COOLING COMPRESSOR HEATING...

  • Page 15: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Units MSX-07HRN1-QC2 MSX-09HRN1-QC2 MSX-12HRN1-QC2 MSX-18HRN1-QC2...
  • Page 16 MSX-21HRN1-QB8W, MSX-24HRN1-QB8W...

  • Page 17: Outdoor Units

    5.2 Outdoor Units MOA-07HN1-QC2...
  • Page 18 MOA1-09HN1-QC2 MOA-09HN1-QC2 MOB1-12HN1-QC2 MOB-12HN1-QC2...
  • Page 19 MOF-18HN1-QC2...
  • Page 20 MOF1-21HN1-QB8W MOF3-24HN1-QB8W...

  • Page 21: 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) Ф16 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 22: Pipe Length And The Elevation

    Additional amount of Model Connective pipe length Air purging refrigerant Less than 5m Use vacuum pump ------------------ MSX-07HRN1-QC2 MSX-09HRN1-QC2 (Pipe length – 5) × 20g/m More than 5m Use vacuum pump MSX-12HRN1-QC2 MSX-18HRN1-QC2 MSX-21HRN1-QB8W (Pipe length – 5) × 40g/m...
  • Page 23 Caution: The capacity test is based on the standard length and the maximum permissive length is based on the system reliability. The oil trap should be installed per 5-7 meters.

  • Page 24: Installation For The First Time

    6.4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below: ● Pressure in the system rises. ● Operating current rises. ● Cooling or heating efficiency drops. ● Moisture in the refrigerant circuit may freeze and block capillary tubing. ●...
  • Page 25 the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points. Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).
  • Page 26 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. 7).

  • Page 27: Adding The Refrigerant After Running The System For Many Years

    from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7). Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage.

  • Page 28: Re-Installation While The Indoor Unit Need To Be Repaired

    side), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7). Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage.
  • Page 29 6). Set the 3-way valve to the closed position immediately. Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa. Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts. Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 kgf.m. Be sure to check for gas leakage.

  • Page 30: Re-Installation While The Outdoor Unit Need To Be Repaired

    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. 7).
  • Page 31 2. Refrigerant charging Electronic scale 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.
  • Page 32 Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage.

  • Page 33: Operation Characteristics

    7. Operation characteristics CAUTION: 1. If air conditioner is used outside of the above conditions, certain safety protection features may come into operation and cause the unit to function abnormally. 2. Room relative humidity less than 80%. If the air conditioner operates in excess of this figure, the surface of the air conditioner may attract condensation.

  • Page 34: Electronic Function

    8. Electronic function 8.1 Abbreviation T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger T3: Coil temperature of outdoor heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperature 8.2 Display function Icon explanation on indoor display board. ON/OFF indicator This indicator illuminates when the air conditioner is in operation.
  • Page 35 Ionizer ( Plasma ) function indicator This indicator illuminates when Ionizer ( Plasma ) function is on.

  • Page 36: Main Protection

    8.3 Main Protection 8.3.1 Time Delay at restart for compressor. 8.3.2 Fan Speed is out of control. (only for MSX-07HRN1-QC2, MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models) ----When Indoor Fan Speed keeps too low or too high for certain time, the unit will stop and the LED will display the failure 8.3.3 Current protection...
  • Page 37 8.3.5 Indoor / outdoor units communication protection(only for MSX-21HRN1-QB8W, MSX-24HRN1-QB8W model) If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes, the AC will stop and display the failure.
  • Page 38 When indoor room temp.T1 is lower than Tn, the compressor and outdoor fan will shut off. When T1 is higher than Tm, the compressor and outdoor fan will start up. Tm=Ts ,Tn=Ts-2 for MSX-07HRN1-QC2, MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models. Tm=Ts+1, Tn=Ts for MSX-21HRN1-QB8W, MSX-24HRN1-QB8W model.
  • Page 39 When the evaporator coil temp.T2 keeps lower than TE5 for 5 minutes, the compressor and outdoor fan will shut off. When T2 is higher than TE6, the compressor and outdoor fan will restart up. While TE5=4℃, TE6=10℃for MSX-07HRN1-QC2, MSX-09HRN1-QC2(2T0032300007 2T0032300007), MSX-12HRN1-QC2(2T0032500006), ℃...
  • Page 40 When indoor room temp.T1 is higher than Tj, the compressor and outdoor fan will shut off. When T1 is lower than Tk, the compressor and outdoor fan will start up. Tj=Ts+6 Tk=Ts+4. for MSX-07HRN1-QC2, MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models. Tj=Ts+3 Tk=Ts+2.for MSX-21HRN1-QB8W, MSX-24HRN1-QB8W models.
  • Page 41 TE4<T2<TE3,the indoor fan will run at low speed. T2<TE4, the indoor fan will shut off. ℃ ℃ ℃ While TE1=28 ,TE2=3 8 ,TE3=30 ,TE4=2 0℃ for MSX-07HRN1-QC2, MSX-09HRN1-QC2 models. ℃ ℃ ℃ ℃ for MSX-12HRN1-QC2 model(2T0032500185) TE1=31 ,TE2=36 ,TE3=30 ,TE4=20 TE1=31℃,TE2=36℃,TE3=30℃,TE4=22℃...
  • Page 42 When T1-Ts>2℃,the indoor fan will run at low speed. When T1-Ts≤0℃, the indoor fan will run at medium speed. 8.4.3.4 Defrosting mode： For MSX-07HRN1-QC2,MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models: Condition of defrosting: AC will enter defrosting mode if any of the following items ①&② is satisfied: ①...
  • Page 43 (1) The defrosting time is reached to the setting value. (2) The compressor current reaches or exceeds I for 7 seconds. DEFROST =3.5A for MSX-07HRN1-QC2 model, I =4.5A for MSX-09HRN1-QC2 model, DEFROST DEFROST =5.0A for MSX-12HRN1-QC2 model. I =8.5A for MSX-18HRN1-QC2 model.
  • Page 44 (1) T3 rises to be higher than TC2. TC2= 20℃. (2) The machine has run for 10 minutes in defrosting. Defrosting action： 8.4.3.5 High evaporator coil temp.T2 protection: For MSX-07HRN1-QC2 model, MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models: While TE7=63℃,TE8=53℃,TE9=51℃ for MSX-07HRN1-QC2 model...
  • Page 45 TE7=63℃,TE8=53℃,TE9=52℃ for MSX-12HRN1-QC2 model. TE7=63℃,TE8=53℃,TE9=50℃ for MSX-18HRN1-QC2 model. For MSX-21HRN1-QB8W, MSX-24HRN1-QB8W models: While TE7=63℃,TE8=54℃,TE9=50℃,TE15=53℃. 8.4.4 Auto-mode The machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts). For MSX-07HRN1-QC2, MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models: ΔT=T1-Ts Running mode ΔT＞2℃ Cooling -3≤ΔT≤2℃...
  • Page 46 8.4.5 Drying mode For MSX-07HRN1-QC2, MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models: 8.4.5.1 The indoor fan will run following the compressor. If the compressor is on ,the indoor fan will run at low speed. If the compressor is off, the indoor fan will run at breeze.
  • Page 47 The forced operation function can not be memorized if power off. 8.4.7 Timer function 8.4.7.1 Timing range is 24 hours. 8.4.7.2 Timer on. The machine will turn on automatically when reaching the setting time. 8.4.7.3 Timer off. The machine will turn off automatically when reaching the setting time. 8.4.7.4 Timer on/off.
  • Page 48 automatically after 3 minutes when power returns. If the memorization condition is forced cooling mode, the unit will run in cooling mode for 30 minutes and then turn to auto mode as 24℃ setting temp.

  • Page 49: Troubleshooting

    9. Troubleshooting 9.1 Indoor unit error display For MSX-07HRN1-QC2, MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2 models: Failure EEPROM error Zero crossing detection error Indoor fan speed has been out of control Over current protection occurs 4 times. The T1 sensor is open circuit or short circuit...

  • Page 50: Diagnosis And Solution

    9.2 Diagnosis and Solution 9.2.1 Indoor fan speed out of control diagnosis and solution Shut off the power supply and turn on it 5s later The unit does not work normally Disassemble the connection between Turn off the unit, rotate the cross the fan and the motor, check if the fan.
  • Page 51 9.2.2 Open or short circuit of temperature sensor diagnosis and solution. Check the connections between the sensors and the PCB. Are the connections good? Replace the sensor and check if Replace the PCB the errors happen again? 9.2.3 Over current protection occurs 4 times. Check if the voltage of the power supply is too low Repair the power supply Check if the operation condition is...
  • Page 52 9.2.4 EEPROM parameter error diagnosis and solution Shut off the power supply and turn on it 5s later The problem comes out again Correct the connection Is the EEPROM chip plugged in indoor PCB well? Replace the main PCB of indoor unit 9.2.5 Zero crossing detection error When such failure occurs, the main control board must have fault.
  • Page 53 9.2.6 Indoor / outdoor units communication error diagnosis and solution Power off, then power on the A/C by the breaker.(reconnect the power wire). Is the error extinguished? Check the wiring on the outdoor terminal indoor terminal following the wiring diagram. Is all the connecting correctly? -24V<Vs<+24V? (Vs is the voltage between S and N...

This manual is also suitable for:

Msx-09hrn1-qc2Msx-18hrn1-qc2Msx-21hrn1-qb8wMsx-12hrn1-qc2Msx-24hrn1-qb8wMoa-07hn1-qc2 ... Show all

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