Midea MS9A-05CR-QD0 Service Manual
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Midea MS9A-05CR-QD0 Service Manual

Midea MS9A-05CR-QD0 Service Manual

Split wall-mounted type air conditioners indoor/outdoor
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9ASAP-1301-A

SERVICE MANUAL

MIDEA AIRCONDITIONER
ASIA PACIFIC OCEAN MARKET
SPLIT WALL-MOUNTED TYPE
LUNA ON-OFF SERIES

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Summary of Contents for Midea MS9A-05CR-QD0

  • Page 1: Service Manual

    9ASAP-1301-A SERVICE MANUAL MIDEA AIRCONDITIONER ASIA PACIFIC OCEAN MARKET SPLIT WALL-MOUNTED TYPE LUNA 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 ..........................12 4. Refrigerant Cycle Diagram ........................14 5. Wiring Diagram ............................16 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 ...
  • 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. ...
  • 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 MS9A-05CR-QD0 MOK-05CP-QD0 MS9A-07CR-QB6 MOK2-07C-QB6 MS9A-07HR-QB6 MOK-07H-QB6 MS9A-09CR-QB6 MOK6-09C-QB6 MS9A-09HR-QB6 MOK3-09H-QB6 MS9A-09CR-QB6(A) MOK8-09C-QB6 MS9A-09CR-QB6 MOK9-09C-QB6 MS9A-09CR-QC0 MOB1-09C-QC0 MS9A-09CR-QC4(A) MOB1-09C-QC4 MS9A-12CR-QC4(A) MOB2-12C-QC4 On-Off MS9A-12CR-QB6 MOA1-12C-QB6 MS9A-12CR-QB6 MOA2-12C-QB6 MS9A-12HR-QB4 MOA1-12H-QB4...
  • Page 9 MS9A-18CR-QC0(A) MOB1-18CP-QC0 MS9A-18CR-QC0 MOB2-18CP-QC0 MS9A-21HR-QB6W MOF4-21H-QB6W MS9A-22CR-QC0 MOF-22C-QC0 MS9A-22CR-QB8 MOF-22C-QB8 MA9A-24HR-QB4W MOF-24H-QB4...
  • Page 10 Filter Killer of Formaldehyde Ionizer+(O) Ionizer(O) 8 degree heating(O) Silver Ico Filter(O) Heat compensation(O) Vitamin C Filter(O) Self-diag. function 3M HAM Filter(O) ydrophilic aluminum fin Bio Filter(O) Anti-rust cabinet Golden Fin(O) Valve protection cover Self Clean(O) PTC Heating Belt(O) Follow me(O) Compressor Crankcase Heater(O) O: optional function...

  • Page 11: Dimension

    3. Dimension 3.1 Indoor Units Model MS9A-05CR-QD0 MS9A-07CR-QB6 MS9A-07HR-QB6 MS9A-09CR-QB6 MS9A-09HR-QB6 MS9A-09CR-QB6(A) MS9A-09CR-QC0 MS9A-09CR-QC4(A) MS9A-12CR-QB6 MS9A-12HR-QB4 MS9A-12HR-QB6 MS9A-12CR-QC4(A) MS9A-18CR-QC0 MS9A-18CR-QB6 MS9A-18HR-QB6 MS9A-18CR-PC4W(A) MS9A-18CR-QC2 MS9A-18CR-QB8 MS9A-18CR-QC4(A) MS9A-18CR-QC0(A) MS9A-21HR-QB6W MS9A-22CR-QC0 MS9A-22CR-QB8...
  • Page 12 MA9A-24HR-QB4W Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS9A-05CR-QD0 MS9A-07CR-QB6 MS9A-07HR-QB6 111.5 MS9A-09CR-QB6 MS9A-09HR-QB6 MS9A-09CR-QB6(A) MS9A-09CR-QC0 MS9A-09CR-QC4(A) MS9A-12CR-QB6 ￠65 MS9A-12HR-QB4 MS9A-12HR-QB6 MS9A-18CR-QC2 MS9A-18CR-QB8 MS9A-18CR-QC4(A) 118.5 MS9A-18CR-QC0(A) MS9A-22CR-QC0 MS9A-22CR-QB8 MA9A-24HR-QB4W...
  • Page 13 Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS9A-12CR-QC4(A) MS9A-18CR-QC0 186.5 ￠65 MS9A-18CR-QB6 MS9A-18HR-QB6 MS9A-18CR-PC4W(A)

  • Page 14: Outdoor Units

    3.2 Outdoor Units More than 30cm More than 60cm (Service space More than 30cm More than 60cm More than 70cm Model MOK-05CP-QD0 MOK2-07C-QB6 MOK-07H-QB6 MOK8-09C-QB6 MOK9-09C-QB6 MOK6-09C-QB6 MOK3-09H-QB6 MOA1-12C-QB6 MOA2-12C-QB6 MOA1-12H-QB4 MOA2-12H-QB6 MOB1-09C-QC0 MOB1-09C-QC4...
  • Page 15 MOB2-12C-QC4 MOB-12H-QB6 MOB-18C-QB6 MOB3-18C-QB8 MOB1-18CP-QC0 MOB2-18CP-QC0 MOB-18H-QB6 MOF-18C-QC4W MOF-18C-QC2 MOF2-18C-QC4 MOF4-21H-QB6W MOF-22C-QC0 MOF-22C-QB8 MOF-24H-QB4 MOC2-18C-QC0...

  • Page 16: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram For cooling only models: INDOOR OUTDOOR LIQUID SIDE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE COMPRESSOR...
  • Page 17 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 18: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Units MS9A-07CR-QB6, MS9A-09CR-QB6, MS9A-12CR-QB6 MS9A-07HR-QB6, MS9A-09HR-QB6, MS9A-12HR-QB4, MS9A-12HR-QB6, MS9A-18HR-QB6...
  • Page 19 MS9A-18CR-QB6...
  • Page 20 MS9A-18CR-PC4W(A) MS9A-05CR-QD0, MS9A-09CR-QB6(A), MS9A-09CR-QB6, MS9A-09CR-QC0, MS9A-09CR-QC4(A)
  • Page 21 MS9A-12CR-QC4(A), MS9A-18CR-QC0 MS9A-18CR-QC2, MS9A-18CR-QB8, MS9A-18CR-QC4(A), MS9A-18CR-QC0(A)
  • Page 22 MS9A-21HR-QB6W, MA9A-24HR-QB4W MS9A-22CR-QC0, MS9A-22CR-QB8...

  • Page 23: Outdoor Units

    5.2 Outdoor Units MOK2-07C-QB6 MOK6-09C-QB6 MOA1-12C-QB6 MOA2-12C-QB6...
  • Page 24 MOB-18C-QB6...
  • Page 25 MOK-07H-QB6 MOK3-09H-QB6 MOB-12H-QB6 MOA1-12H-QB4 MOA2-12H-QB6...
  • Page 26 MOK-05CP-QD0, MOK8-09C-QB6, MOK9-09C-QB6, MOB1-09C-QC0, MOB1-09C-QC4, MOB2-12C-QC4 MOF-18C-QC2, MOF2-18C-QC4...
  • Page 27 MOB3-18C-QB8, MOC2-18C-QC0, MOB1-18CP-QC0, MOB2-18CP-QC0...
  • Page 28 MOB-18H-QB6...
  • Page 29 MOF-18C-QC4W MOF4-21H-QB6W...
  • Page 30 MOF-22C-QC0, MOF-22C-QB8 MOF-24H-QB4...

  • Page 31: 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) 15.9 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 32: Pipe Length And The Elevation

    6.3 Pipe length and the elevation The pipe length and refrigerant amount: Model Connective pipe length Air purging Additional amount of refrigerant Less than 5m Use vacuum pump ------------------ 7k,9k,12k,18k(except More than 5m Use vacuum pump (Pipe length – 5) × 30g/m MS9A-18CR-PC4W(A)) MS9A-18CR-PC4W(A) MS9A-21HR-QB6W...

  • Page 33: 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 34 the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If 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 35 Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare 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.

  • Page 36: Adding The Refrigerant After Running The System For Many Years

    6).When the electronic scale displays the proper weight (refer to the table), 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.

  • Page 37: Re-Installation While The Indoor Unit Need To Be Repaired

    6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low 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).
  • Page 38 5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa. 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.

  • Page 39: Re-Installation While The Outdoor Unit Need To Be Repaired

    Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare 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.
  • Page 40 5). Disconnect the charge hose from the vacuum pump. 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 41 6). Mounted 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 42: 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 43: 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 8.2.1 Icon explanation on indoor display board. Run indication lamp: This lamp illuminates when the air conditioner is in operation.

  • Page 44: Main Protection

    8.3 Main Protection 8.3.1 Time Delay at restart for compressor. 8.3.2 Fan Speed is out of control.(except MS9A-21HR-QB6W and MA9A-24HR-QB4W 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 I3SEC...

  • Page 45: Operation Modes And Functions

    8.4 Operation Modes and Functions 8.4.1 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. (5) Auto fan: 8.4.2 Cooling Mode 8.4.2.1 Compressor running rules:...
  • Page 46 when AC is in evaporator high temp. protection in heating mode ,defrosting mode and the current protection. 8.4.2.3 Indoor fan running rules In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low and auto.
  • Page 47 Tk=Ts+Tc-1. 8.4.3.2 Outdoor fan running rules: The outdoor units have single fan speed. The outdoor fan will run following the compressor except when AC is in evaporator high temp. protection in heating mode ,defrosting mode and the current protection. 8.4.3.3 Indoor fan running rules: Indoor fan can be set to high/med/low/auto when the compressor is on.
  • Page 48 8.4.3.4 Defrosting mode： For MS9A-21HR-QB6W and MA9A-24HR-QB4W models:  Condition of defrosting: AC will enter defrosting mode if any of the following items is satisfied. (1) When T3＜TC1℃, if the compressor keeps running over 45 minutes and T3＜TC3℃ for 3 minutes.
  • Page 49 ＜TL Low speed DEFROST Breeze/off No need to compare the T2 and T1 (2) After the last defrosting, the time that the outdoor fan is off but the compressor is on in high T2 protection cumulates up to 90 minutes. ...
  • Page 50 8.4.3.5 High evaporator coil temp.T2 protection: 8.4.4 Auto-mode The machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts). For MS9A-09CR-QC4(A), MS9A-12CR-QC4(A), MS9A-18CR-QC0 models: ΔT=T1-Ts Running mode ΔT＞2℃ Cooling -3≤ΔT≤2℃ Fan-only ΔT<-3℃ Heating (for cooling only models, they will run at fan-only mode) For other models: ΔT=T1-Ts...
  • Page 51 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. Running rules: Condition Indoor fan Compressor 6 minutes T1 ≥...
  • Page 52 Forced auto mode: The action of forced auto mode is the same as normal auto mode with 24℃ setting temperature. When AC receives signals, such as switch on, switch off, timer on, timer off, mode setting, fan  speed setting, sleeping mode setting ,follow me setting, it will quit the forced operation. 8.4.7 Timer function 8.4.7.1 Timing range is 24 hours.
  • Page 53 8.4.9 Auto-Restart function The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module. In case of a sudden power failure, the module memorizes the setting conditions before the power failure. The unit will resume the previous operation setting (not including Swing function) automatically after 3 minutes when power returns.

  • Page 54: Troubleshooting

    Zero crossing signal detection error Indoor fan speed has been out of control Open circuit or short circuit of room temperature sensor Evaporator temperature sensor open circuit or short circuit For MS9A-05CR-QD0, MS9A-09CR-QB6(A), MS9A-09CR-QB6 Display LED STATUS EEPROM error Zero crossing signal detection error...
  • Page 55 For other models: Operation lamp Timer lamp Failure ☆ Indoor fan speed has been out of control ☆ The T1 or T2 sensor is open circuit or short circuit Over current protection occurs 4 times(except ☆ MS9A-09CR-QC4(A), MS9A-12CR-QC4(A), MS9A-18CR-QC0) ☆ EEPROM error ☆...

  • Page 56: Diagnosis And Solution

    9.2 Diagnosis and Solution 9.2.1 EEPROM parameter error diagnosis and solution Shut off the power supply and turn it on 5 seconds later. Is it still displaying the error code? If the EEPROM chip is welded on main PCB, replace the main PCB directly.
  • Page 57 9.2.3 Indoor fan speed has been out of control diagnosis and solution Shut off the power supply and turn it on 5 seconds The unit operates normally. later. Is it still displaying the error code? Find out the cause and have it solved.
  • Page 58 Index 1: 1.Indoor AC Fan Motor Measure the resistance value of each winding by using the tester. Index2: 1: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.
  • Page 59 9.2.5 Over current protection occurs 4 times diagnosis and solution Check if the voltage of the Repair the power supply. power supply is too low ? Is the outdoor operation temperature too high? Does the Correct the operation condition. outdoor unit has bad air circulation? Check if the outdoor Correct the connection of fan...
  • Page 60 9.2.6 Indoor / outdoor units communication error diagnosis and solution Power off, then turn on the unit 5 seconds later(reconnect the power wire).Is the error still displaying after several minutes? Check all the wirings between indoor and outdoor, indoor main PCB and outdoor main PCB following the wiring diagram.
  • Page 61 Main parts check 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.

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