Midea NEOLA ON-OFF Service Manual
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Midea NEOLA ON-OFF Service Manual

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NEOLA ON-OFF SERIES
Service Manual 2012
11DSEU-B-1202

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Summary of Contents for Midea NEOLA ON-OFF

  • Page 1 NEOLA ON-OFF SERIES Service Manual 2012 11DSEU-B-1202...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution .......................... 1 1.2 Warning ............................1 2. Function ................................ 6 3. Dimension ..............................8 3.1 Indoor Units ........................... 8 3.2 Outdoor Units ..........................10 4. Refrigerant Cycle Diagram ........................11 5. Wiring Diagram ............................12 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 MS11D-07HRN1-QB6 MOK-07HN1-QB6 MS11D-07HRN1-QC2(2T0032100248) MOK3-07HN1-QC2 MS11D-07HRN1-QC2(2T0032100252) MOK3-07HN1-QC2 MS11D-09HRN1-QB6 MOK-09HN1-QB6 MS11D-09HRN1-QC2(2T0032300727) MOA2-09HN1-QC2 MS11D-09HRN1-QC2(2T0032300764) MOA2-09HN1-QC2 MS11D-12HRN1-QB6 MOA2-12HN1-QB6 On-Off MS11D-12HRN1-QC2(2T0032400199) MOB4-12HN1-QC2 MS11D-12HRN1-QC2(2T0032400212) MOB-11HN1-QC2 MS11D-18HRN1-QB6 MOB-18HN1-QB6 MS11D-18HRN1-QB8 MOC-18HN1-QB8 MS11D-21HRN1-QB6W MOC-21HN1-QB6W MS11D-21HRN1-QB8W MOP-21HN1-QB8W MS11D-24HRN1-QB6W MOP-24HN1-QB6W MS11D-24HRN1-QB8W...
  • Page 9 Filter 0.5W Standby (O) Follow Me(O) Killer Of Formaldehyde Louver Position Memory Function Ionizer(O) Plasma(O) Refrigerant Leakage Detect Silver Ico Filter(O) Self-diag. Function Vitamin C Filter(O) ydrophilic Aluminum Fin 3M HAM Filter(O) Anti-rust Cabinet Bio Filter(O) Valve Protection Cover Golden Fin(O) PTC Heating Belt(O) Self Clean(O) Compressor Crankcase Heater(O)

  • Page 10: Dimension

    3. Dimension 3.1 Indoor Units Model MS11D-07HRN1-QB6 MS11D-07HRN1-QC2 MS11D-09HRN1-QB6 MS11D-09HRN1-QC2(2T0032300727) MS11D-12HRN1-QB6 MS11D-12HRN1-QC2 MS11D-09HRN1-QC2(2T0032300764) MS11D-18HRN1-QB6 MS11D-18HRN1-QB8 MS11D-21HRN1-QB6W 1030 MS11D-21HRN1-QB8W MS11D-24HRN1-QB6W 1030 MS11D-24HRN1-QB8W...
  • Page 11 Dimension of installation Model R(mm) L(mm) H(mm) hole(mm) MS11D-07HRN1-QB6 MS11D-07HRN1-QC2 MS11D-09HRN1-QB6 MS11D-09HRN1-QC2(2T0032300727) ￠65 MS11D-12HRN1-QB6 MS11D-12HRN1-QC2 MS11D-09HRN1-QC2(2T0032300764) MS11D-18HRN1-QB6 MS11D-18HRN1-QB8 Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS11D-21HRN1-QB6W MS11D-21HRN1-QB8W ￠65 MS11D-24HRN1-QB6W MS11D-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 70cm Model MOK-07HN1-QB6 MOK3-07HN1-QC2 MOK-09HN1-QB6 MOA2-09HN1-QC2 MOA2-12HN1-QB6 MOB-11HN1-QC2 MOB4-12HN1-QC2 MOB-18HN1-QB6 MOC-18HN1-QB8 MOC-21HN1-QB6W MOP-21HN1-QB8W MOP-24HN1-QB6W MOF2-24HN1-QB8W...

  • Page 13: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram 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 14: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Units MS11D-07HRN1-QB6, MS11D-07HRN1-QC2, MS11D-09HRN1-QB6, MS11D-09HRN1-QC2, MS11D-12HRN1-QB6, MS11D-12HRN1-QC2, MS11D-18HRN1-QB6, MS11D-18HRN1-QB8...
  • Page 15 MS11D-21HRN1-QB6W, MS11D-21HRN1-QB8, MS11D-24HRN1-QB6W, MS11D-24HRN1-QB8W...

  • Page 16: Outdoor Units

    5.2 Outdoor Units MOK-07HN1-QB6, MOK3-07HN1-QC2, MOK-09HN1-QB6, MOA2-09HN1-QC2, MOA2-12HN1-QB6, MOB4-12HN1-QC2, MOB-18HN1-QB6, MOB-11HN1-QC2 MOC-18HN1-QB8...
  • Page 17 MOC-21HN1-QB6W, MOP-21HN1-QB8W, MOP-24HN1-QB6W, MOF2-24HN1-QB8W...

  • Page 18: Installation Details

    6. Installation details 6.1 Wrench torque sheet for installation Additional Outside diameter Torque tightening torque inch N.cm N.cm 1500 1600 Ф6.35 (153kgf.cm) (163kgf.cm) 2500 2600 Ф9.52 (255kgf.cm) (265kgf.cm) 3500 3600 Ф12.7 (357kgf.cm) (367kgf.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 19: Pipe Length And The Elevation

    6.3 Pipe length and the elevation The pipe length and refrigerant amount: Pipe size Standard Max. Max. Additional Model length Elevation Length refrigerant Liquid B (m) A (m) (g/m) MS11D-07HRN1-QC2+ MOK3-07HN1-QC2 MS11D-07HRN1-QB6+ MOK-07HN1-QB6 3/8’’ 1/4’’ (Ф9.53) (Ф6.35) MS11D-09HRN1-QB6+ MOK-09HN1-QB6 MS11D-09HRN1-QC2+ MOA2-09HN1-QC2 MS11D-12HRN1-QC2+ MOB4-12HN1-QC2 MS11D-12HRN1-QB6+ MOA2-12HN1-QB6 1/2’’...

  • Page 20: 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 21 3). Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly. 4). Set the 2-way valve to the close position 5).
  • Page 22 4). Check the gas leakage. Check the flare connections for gas leakage. 5). Discharge the refrigerant. 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).

  • Page 23: Adding The Refrigerant After Running The System For Many Years

    3) Put the charging cylinder onto the electronic scale and record the weight. 4) Operate the air conditioner at the cooling mode. 5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant. 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.

  • Page 24: Re-Installation While The Indoor Unit Need To Be Repaired

    3) Put the charging cylinder onto the electronic scale and record the weight. 4) Operate the air conditioner at the cooling mode. 5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant. 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.
  • Page 25 Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly. 4). Set the 2-way valve to the close position. 5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa. 6).

  • Page 26: Re-Installation While The Outdoor Unit Need To Be Repaired

    4). Check the gas leakage Check the flare connections for gas leakage. 5). Discharge the refrigerant. 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).
  • Page 27 4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump). 5). Disconnect the charge hose from the vacuum pump. 2.
  • Page 28 If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air conditioner before disconnecting the hose. 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 29: Operation Characteristics

    7. Operation characteristics Temperature Heating Cooling operation Drying operation Mode operation 10℃～32℃ (<21000Btu/h models) Room temperature 17℃～32℃ 0℃～30℃ 17℃～32℃ (≥21000Btu/h models) 11℃～43℃ 18℃～43℃ (<21000Btu/h models) -5℃～43℃ Outdoor 18℃～43℃ (For the models with -7℃～24℃ temperature (≥21000Btu/h models) low temperature cooling system) 21℃～52℃...

  • Page 30: Electronic Function

    8. Electronic function 8.1 Abbreviation T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger 8.2 Display function 8.2.1 Icon explanation on indoor display board. One of the following figures matches its display board. Run indicator Flash at 0.5Hz when the unit is standby. Illuminate when the unit is turned on Timer indicator This indicator illuminates when TIMER is set ON/OFF.

  • Page 31: Main Protection

    8.3 Main Protection 8.3.1 Time Delay at restart for compressor. 8.3.2 Sensor protection at open circuit and breaking disconnection. 8.3.3 Zero crossing detection error protection If AC can not detect zero crossing signals for 4 minutes or the zero crossing signal time intervals is not correct, the unit will stop and the LED will display the failure.
  • Page 32 Ts-2 8.4.2.2 Outdoor fan running rules: The On-off 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 ,condenser high temp. protection in cooling 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 33 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℃, TE 6=10℃ for 7k,9k,12k,18k models and TE5=3℃, TE 6=14℃ for 21,24 models. 8.4.3 Heating Mode (For Heating &...
  • Page 34 Setting Breeze Auto fan action: 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: 1、AC will enter defrosting mode if all of the following items is satisfied. 1.1 After the compressor keeps running 8 minutes, ΔT ΔT ≥4℃（ΔT=T2-T1）...
  • Page 35 A2: The cumulative compressor running time is over 120 minutes. Meanwhile the value of ΔT meets the below table. ℃ ΔT ＜TH High speed DEFROST ＜TM Medium speed DEFROST ＜TL Low speed DEFROST While Model (℃) (℃) (℃) DEFROST DEFROST DEFROST MS11D-07HRN1-QC2 (2T0032100252)
  • Page 36 normal heating mode. (1) The defrosting time is reached to the setting value. (2) After defrosting for 3 minutes,T2≥2℃. ≥2℃. (3) If the defrosting time is between 2 and 4 minutes, T2 max-  Defrosting action： Compressor 4-way valve Outdoor fan Indoor fan Indoor fan breeze(10s) DF-5...
  • Page 37 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 -3≤ΔT≤2℃ Fan-only ΔT<-3℃ Heating(for cooling only models, they will run at fan-only mode) AC will run in auto mode in the below cases: （1）...
  • Page 38 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. The machine will turn on automatically when reaching the setting “on” time, and then turn off automatically when reaching the setting “off”...
  • Page 39 ℃ setting temp. and then turn to drying mode as 24 8.4.10 Ionizer dust collector function (optional) The indoor unit is equipped with Ionizer, which is controlled by the CLEAN AIR button on the remote controller. When the unit is turned on, press the CLEAN AIR button to activate the function. Press it again to stop the function.

  • Page 40: Troubleshooting

    9. Troubleshooting 9.1 Indoor unit error display For 7k, 9k, 12k, 18k Display Operation lamp flash times Timer lamp Failure EEPROM error Zero crossing detection error Indoor fan speed has been out of control Default Indoor room temperature sensor T1 open circuit or short circuit Evaporator coil temperature sensor T2 open circuit or short circuit...

  • Page 41: Diagnosis And Solution

    9.2 Diagnosis and Solution 9.2.1 Indoor fan speed out of control diagnosis Shut off the power supply and turn on it 5s later The unit does not work normally Turn off the unit, rotate the cross Disassemble the connection between fan.
  • Page 42 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 outdoor PCB the errors happen again? 9.2.3 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...
  • Page 43 9.2.5 Indoor / outdoor unit’s communication error Turn off the power supply, after 1 minute, connect the power supply, turn on the unit. E1 after 8 munities Check the wiring between indoor and outdoor unit. Do the wires can work normal and connect Reconnect and retest correctly? Is all the wiring between terminal and...
  • Page 44 9.2.6 Refrigerant Leakage Detection Shut off the power supply and turn on it 5s later The problem comes out again Replace the T2 sensor and check if the errors Is there cool air blowing out from the indoor air outlet? happen again? Is there any leakage? Especially the connection Replace the indoor PCB...

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