Midea MS9A-07HRN1-QB6 Service Manual
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Midea MS9A-07HRN1-QB6 Service Manual

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LUNA ON-OFF SERIES
Service Manual 2014
9ASEU-B1-1401

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Summary of Contents for Midea MS9A-07HRN1-QB6

  • Page 1 LUNA ON-OFF SERIES Service Manual 2014 9ASEU-B1-1401...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution .......................... 1 1.2 Warning ............................1 2. Function ................................ 5 3. Dimension ..............................7 3.1 Indoor Units ........................... 7 3.2 Outdoor Units ..........................10 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 the 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.  Do not install the product on a defective installation stand.  Be sure the installation area does not deteriorate with age. If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.
  • Page 5 There is risk of property damage, failure of product, or electric shock.  Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.) There is risk of physical injury, electric shock, or product failure. ...
  • Page 6 could cause product malfunction or inefficient operation.  Operational  Do not expose the skin directly to cool air for long time. (Do not sit in the draft).  Do not use the product for special purposes, such as preserving foods, works of art etc. It is a consumer air conditioner, not a precision refrigerant system.

  • Page 7: Function

    2. Function Model Names of Indoor/Outdoor Units Series Capacity Indoor units Outdoor units MS9A-07HRN1-QB6 MOK-07HN1-QB6 MS9A-07HRN1-QB6 MOK1-07HN1-QB6 MS9A-07HRN1-QC2 MOK1-07HN1-QC2 MS9A-09HRN1-QB6 MOK1-09HN1-QB6 MS9A-09HRN1-QB8 MOK-09HN1-QB8 MS9A-09HRN1-QC2 MOA1-09HN1-QC2 MS9A-09HRN1-QC2 MOA3-09HN1-QC2 MS9A-09HRN1-QC7G MOB1-09HN1-QC7 MS9A-11HRN1-QB8 MOA-11HN1-QB8 MS9A-12HRN1-QC2 MOB1-12HN1-QC2 On-Off MS9A-12HRN1-QC2 MOB3-12HN1-QC2 MS9A-12HRN1-QC7G MOB-12HN1-QC7 MS9A-16HRN1-QB8(A) MOB1-18HN1-QB6...
  • Page 8 Filter Cold catalyst filter 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 9: Dimension

    3. Dimension 3.1 Indoor Units Model MS9A-07HRN1-QB6 MS9A-07HRN1-QC2 MS9A-09HRN1-QC2 MS9A-09HRN1-QB8 MS9A-09HRN1-QB6 MS9A-09HRN1-QC7G MS9A-11HRN1-QB8 MS9A-12HRN1-QC2 MS9A-16HRN1-QB8(A) MS9A-12HRN1-QC7G MS9A-16HRN1-QB6 MS9A-17HRN1-QC0 MS9A-18HRN1-QB6 MS9A-18HRN1-QC0 MS9A-18HRN1-QC5 MS9A-24HRN1-QB8W...
  • Page 10 Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS9A-07HRN1-QB6 MS9A-07HRN1-QC2 MS9A-09HRN1-QB6 MS9A-09HRN1-QB8 ￠65 MS9A-09HRN1-QC2 MS9A-09HRN1-QC7G MS9A-11HRN1-QB8 MS9A-12HRN1-QC2 MS9A-16HRN1-QB8(A)
  • Page 11 Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS9A-12HRN1-QC7G MS9A-16HRN1-QB6 ￠65 MS9A-17HRN1-QC0 MS9A-18HRN1-QB6 MS9A-18HRN1-QC0 Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS9A-18HRN1-QC5 ￠65 MS9A-24HRN1-QB8W...

  • Page 12: Outdoor Units

    3.2 Outdoor Units More than 30cm More than 60cm (Service space) More than 30cm More than 60cm More than 200cm...
  • Page 13 Model MOK-07HN1-QB6 MOK1-07HN1-QB6 MOK1-07HN1-QC2 MOK1-09HN1-QB6 MOK-09HN1-QB8 MOA1-09HN1-QC2 MOA3-09HN1-QC2 MOA-11HN1-QB8 MOB1-09HN1-QC7 MOB-12HN1-QC7 MOB3-16HN1-QB6 MOB1-12HN1-QC2 MOB3-12HN1-QC2 MOB1-18HN1-QB6 MOC-17HN1-QC0 MOC-18HN1-QC0 MOP-24HN1-QB8W MOF3-18HN1-QC5 MOF1-24HN1-QB8W...

  • Page 14: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE T3 Condenser temp. sensor 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...

  • Page 15: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Units MS9A-07HRN1-QB6, MS9A-07HRN1-QC2, MS9A-09HRN1-QB6, MS9A-09HRN1-QB8, MS9A-09HRN1-QC2, MS9A-09HRN1-QC7G, MS9A-11HRN1-QB8, MS9A-12HRN1-QC2, MS9A-16HRN1-QB6,MS9A-16HRN1-QB8(A),MS9A-17HRN1-QC0, MS9A-18HRN1-QB6， MS9A-18HRN1-QC0...
  • Page 16 MS9A-12HRN1-QC7G...
  • Page 17 MS9A-18HRN1-QC5...
  • Page 18 MS9A-24HRN1-QB8W...

  • Page 19: Outdoor Units

    5.2 Outdoor Units MOK-07HN1-QB6, MOK1-07HN1-QB6,MOK1-07HN1-QC2, MOK1-09HN1-QB6, MOK-09HN1-QB8, MOA1-09HN1-QC2, MOA3-09HN1-QC2, MOB1-09HN1-QC7, MOA-11HN1-QB8,MOB-12HN1-QC7, MOB3-12HN1-QC2, MOB1-12HN1-QC2, MOB3-16HN1-QB6, MOB1-18HN1-QB6...
  • Page 20 MOC-17HN1-QC0...
  • Page 21 MOC-18HN1-QC0, MOF3-18HN1-QC5...
  • Page 22 MOP-24HN1-QB8W...
  • Page 23 MOF1-24HN1-QB8W...

  • Page 24: 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 25: Pipe Length And The Elevation

    The pipe length and refrigerant amount: Standard Max. Max. Additional Pipe size Model length Elevation Length refrigerant Liquid B (m) A (m) (g/m) MS9A-07HRN1-QB6+MOK-07HN1-QB6 MOK1-07HN1-QB6+MOK1-07HN1-QB6 MS9A-07HRN1-QC2+MOK1-07HN1-QC2 MS9A-09HRN1-QB6+MOK1-09HN1-QB6 3/8’’ 1/4’’ MS9A-09HRN1-QB8+ MOK-09HN1-QB8 (Ф9.52) (Ф6.35) MS9A-09HRN1-QC2+MOA1-09HN1-QC2 MS9A-09HRN1-QC2+MOA3-09HN1-QC2 MS9A-09HRN1-QC7G+ MOB1-09HN1-QC7 MS9A-12HRN1-QC2+MOB1-12HN1-QC2 MS9A-11HRN1-QB8+MOA-11HN1-QB8 MS9A-12HRN1-QC2+MOB3-12HN1-QC2 MS9A-12HRN1-QC7G+ MOB-12HN1-QC7 1/2’’...

  • Page 26: 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 27 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 28 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 29: 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 30: 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 31 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 32: 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 33 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 34 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 35: Operation Characteristics

    7. Operation characteristics 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. 2. The room relative humidity should be less than 80%. If the air conditioner operates beyond this figure, the surface of the air conditioner may attract condensation.

  • Page 36: Electronic Function

    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. This lamp illuminates when the air conditioner is in operation. Run indication lamp: Auto indication lamp: Lights up during the Auto operation.

  • Page 37: Main Protection

    8.3 Main Protection 8.3.1 Time Delay at restart for the compressor 8.3.2 Fan Speed is out of control.(except MS9A-24HRN1-QB8W models) ----When the 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 38: 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 the same as in cooling mode. (5) Auto fan: High Medium...
  • Page 39 compressor except 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 40 Tj=Ts+Tc 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 action of 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 41 T1-Ts Medium 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  Condition of defrosting: For 7k,9k,12k,16k,17k,18k models: AC will enter defrosting mode if any of the following items is satisfied. (1) Both A and B are satisfied A: The compressor keeps running for 40 minutes.
  • Page 42  Condition of ending defrosting: If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to normal heating mode. (1) The defrosting time is reached to the setting value. (2) The compressor current has reached or exceeded I for 7 seconds.
  • Page 43 For MS9A-09HRN1-QB8, MS9A-09HRN1-QC2(2T0032300908),MS9A-11HRN1-QB8, MS9A-16HRN1-QB8(A): Condition of defrosting: If any one of following items is satisfied, defrosting will start. Condition 1: Both the following conditions are satisfied: A: If the working time of the compressor accumulates to 42 min and one continuous working time is more than 330s.
  • Page 44 Defrosting actions： During the defrosting mode, if the machine stopped or transferred to other mode, the defrosting mode will stop, and all the defrosting conditions will be cleared. For 21k,24k models:  Condition of defrosting: AC will enter defrosting mode if any of the following items is satisfied. (1) If T3<TC1 and the compressor keeps running over 45 minutes.
  • Page 45 8.4.3.5 High evaporator coil temp.T2 protection For 7k,9k,12k,16k,17k,18k models: For 21k,24k models: 8.4.4 Auto-mode The machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts). ΔT=T1-Ts Running mode ΔT>2 ℃ Cooling -1℃ ≤ΔT≤2℃ Fan-only ΔT<-1 ℃ Heating (for cooling only models, they will run at fan-only mode) AC will run in auto mode in the below cases:...
  • Page 46 Running rules: Condition Indoor fan Compressor 6 minutes ≧2 T1- Ts Breeze OFF 4 minutes 5 minutes 0≤T1- Ts＜2 Breeze OFF 5 minutes 4 minutes T1- Ts＜0 Breeze OFF 6 minutes In drying mode, if the room temperature is lower than 10℃, the indoor fan will run at breeze while the compressor and outdoor fan will stop and not resume until room temperature exceeds 13℃.
  • Page 47 then turn off automatically when reaching the setting “off” time. 8.4.7.5 Timer off/on. The machine will turn off automatically when reaching the setting “off” time, and then turn on automatically when reaching the setting “on” time. 8.4.7.6 The timer function will not change the AC current operation mode. Suppose AC is off now, it will not start up firstly after setting the “timer off”...
  • Page 48 delay when power on. If AC is on before power off and AC is required to start up now, the compressor will have 3 minutes delay when power on. indoor fan restarts after malfunctions being eliminated and anti-cold-wind being released, Ionizer will be available again.

  • Page 49: Troubleshooting

    9. Troubleshooting 9.1 Indoor unit error display For MS9A-09HRN1-QB8, MS9A-09HRN1-QC2(2T0032300908), MS9A-11HRN1-QB8, MS9A-16HRN1-QB8(A): Display LED STATUS EEPROM error Zero crossing signal detection error Indoor fan speed has been out of control Over current protection of the compressor occurs 4 times Open circuit or short circuit of room temperature sensor Evaporator temperature sensor open circuit or short circuit For 21k,24k models: Display...

  • Page 50: Diagnosis And Solution

    9.2 Diagnosis and Solution 9.2.1 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 51 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 52 9.2.2 The temp sensor is open circuit or short circuit diagnosis and solution Check the connections between temperature Correct the connections. sensor and PCB. Are the connections good? Check the resistance value of the sensor via table1 Replace indoor or outdoor PCB. and table 2, is it normal? Replace the sensor and c h e c k i f t h e p r o b l e m...
  • Page 53 9.2.3 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 54 9.2.4 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? Is the EEPROM chip Correct the connection. plugged in PCB well? Replace the indoor PCB. 9.2.5 Zero crossing detection error diagnosis and solution Check if the connections and Correct the connections.
  • Page 55 9.2.6 Indoor unit and outdoor unit communication malfunction 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 56 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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