Midea 9V SERIES Service Manual
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Midea 9V SERIES Service Manual

Midea 9V SERIES Service Manual

On-off split wall-mounted type airconditioner
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9VSAP-1010-A

SERVICE MANUAL

MIDEA AIRCONDITIONER
On-Off
SPLIT WALL-MOUNTED TYPE
9V SERIES
9220+9221

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Summary of Contents for Midea 9V SERIES

  • Page 1: Service Manual

    9VSAP-1010-A SERVICE MANUAL MIDEA AIRCONDITIONER On-Off SPLIT WALL-MOUNTED TYPE 9V SERIES 9220+9221...

  • 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 Unit ............................. 9 3.2 Outdoor Unit ..........................10 4. Refrigerant Cycle Diagram ........................11 5. Wiring Diagram ............................12 5.1 Indoor Unit ...........................

  • 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 Sharp edges could cause injury, be especially careful of the case edges and the fins on the condenser and evaporator.  For installation, always contact the dealer or an Authorized service center. There is risk of fire, electric shock, explosion, or injury. ...
  • Page 5 Do not use the telephone or turn switches on or off. 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. ...
  • Page 6 A bad connection may cause water leakage.  Keep level even when installing the product. To avoided 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.
  • Page 7 A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.  Do not insert hands or other object through air inlet or outlet while the product is operated. There are sharp and moving parts that could cause personal injury. ...

  • Page 8: Function

    2. Function Model Names of Indoor/Outdoor Units Cooling only: Series Capacity Indoor units Outdoor units MS9V-07CR-QB6 MOK2-07C-QB6 MS9V-09CR-QB6 MOK6-09C-QB6 On-Off MS9V-12CR-QB6 MOA1-12C-QB6 MS9V-18CR-QB MOB-18C-QB6 Cooling & Heating Series Capacity Indoor units Outdoor units MS9V-07HR-QB6 MOK-07H-QB6 MS9V-09HR-QB6 MOK3-09H-QB6 On-Off MS9V-12HR-QB6 MOB-12H-QB6 MS9V-18HR-QB6 MOB-18H-QB6...
  • Page 9 Indoor unit Operation ON/OF by remote controller Auto Restart Function When the power supply is interrupted and then restore, the air conditioners automatically restore the previous function setting Sensing by room temperature Room temperature sensor. Pipe temperature sensor. Room temperature control Self-cleaning Maintain the room temperature in accordance with the setting temperature.
  • Page 10 Outdoor unit Power relay control The unit has 3 min delay between continuously ON/OFF operations. Low noise air flow system Bird tail propeller fan makes the outdoor unit run more quietly. Hydrophilic aluminum fin for heat pump models The hydrophilic fin can improve the heating efficiency at operation mode.

  • Page 11: Dimension

    3. Dimension 3.1 Indoor Unit Dimension Mode MS9V-07CR-QB6/MS9V-07HR-QB6 MS9V-09CR-QB6/MS9V-09HR-QB6 MS9V-12CR-QB6/MS9V-12HR-QB6 MS9V-18CR-QB+MS9V-18HR-QB6 For smaller than 18K model: For 18K model:...

  • Page 12: Outdoor Unit

    3.2 Outdoor Unit MOK2-07C-QB6 MOK-07H-QB6 MOK6-09C-QB6 MOK3-09H-QB6 Dimension Mode 7K、9K MOA1-12C-QB6 MOB-12H-QB6 MOB-18C-QB6 MOB-18H-QB6 Dimension Mode MOA1-12C-QB6 MOB-12H-QB6 MOB-18C-QB6 MOB-18H-QB6...

  • Page 13: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram Cooling only: Heat pump mode:...

  • Page 14: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Unit Cooling only:...
  • Page 15 Cooling & Heating:...

  • Page 16: Outdoor Unit

    5.2 Outdoor Unit Smaller than 18K model: Cooling only:...
  • Page 17 Cooling & Heating:...
  • Page 18 For 18 K model: Cooling only:...
  • Page 19 Cooling & Heating:...

  • Page 20: Installation Details

    6. Installation details 6.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N·cm N·cm 1500 1600 Ф6.35 (153kgf.cm) (163kgf.cm) 2500 2600 Ф9.53 (255kgf.cm) (265kgf.cm) 3500 3600 Ф12.7 (357kgf.cm) (367kgf.cm) 4500 4700 Ф16 (459kgf.cm) (479kgf.cm) 6.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet.

  • Page 21: Air Purging With Vacuum Pump

    Caution: Capacity test is based on standard length and maximum allowance length is based on reliability. Oil trap should be installed per 5-7 meters. 6.4 Air purging with vacuum pump Air and moisture in the refrigerant system have undesirable effects as below: ●...

  • Page 22: Pumping Down (Re-Installation)

    1. Completely tighten the flare nuts of the indoor and outdoor units, connect the manifold valve charge. 2. Connect the charge hose connection to the vacuum pump. 3. Fully open the handle Lo of the manifold valve. 4. Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare nut of the Lo valve on the gas pipe side and check the air is entering.
  • Page 23 Produce 1. Confirm that both the 2-way and 3-way valves are set to the opened position. Remove the valve stem caps and confirm that the valve stems are in the opened position. Be sure to use a hexagonal wrench to operate the valve stems. 2.

  • Page 24: Re-Air Purging (Re-Installation)

    6.6 Re-air purging (Re-installation) Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the closed position. 2. Connect the charge set and a charging cylinder to the service port of the 3-way valve. Leave the valve on the charging cylinder closed. 3.

  • Page 25: Balance Refrigerant Of The 2-Way, 3-Way Valves

    Be sure to use a hexagonal wrench to operate the valve stems. 7. Mount the valve stems nuts and the service port cap. Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m. Be sure to check the gas leakage.

  • Page 26: Evacuation

    6.8 Evacuation Procedure: 1. Connect the vacuum pump to the charge set’s centre hose. 2. Evacuation for approximately one hour. Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less]. 3. 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).

  • Page 27: Gas Charging

    6.9 Gas charging Procedure: 1. Connect the charge hose to the charging cylinder. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge. 2.

  • Page 28: Operation Characteristics

    5. 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. 7. Operation characteristics Mode Heating Cooling operation Drying operation Temperature operation 10℃~32℃...

  • Page 29: Electronic Function

    8. Electronic function 8.1 Abbreviation T1: Indoor ambient temperature T2: Pipe temperature of indoor heat exchanger Ts: Set temperature 8.2 Display function 8.2.1 Icon explanation on indoor display board: Run indicator Flash at 0.5Hz when the unit is standby. Illuminate when the unit is turned on Auto indicator This indicator illuminates when the air conditioner is in AUTO operation.

  • Page 30: Main Protection

    8.3 Main Protection 8.3.1 Time Delay at restart for compressor. 8.3.2 Current protection The following chart shows the protection if the current was too high. While = 4.5A, = 5.5A = 6.5A = 7.5A for 7K model; Restore 5Min 3Sec = 5.0A, = 6.5A = 7.5A...
  • Page 31 8.4.2 Cooling Mode 8.4.2.1 Compressor and outdoor fan control The action of the compressor and the outdoor fan are submitted to the following rule: 8.4.2.2 Indoor fan running rules In cooling mode, indoor fan runs all the time and the speed can be selected in high, medium, low and auto speed.
  • Page 32 While TE5 = 4℃ ，TE6 = 10℃ for 7k 、9K、12K model While TE5 = 3℃ ，TE6 = 12℃ for 18k model 8.4.3 Heating Mode 8.4.3.1 Compressor and outdoor fan running rules Each startup of the compressor, it will work for 7min unconditionally, then the compressor and outdoor fan will be controlled by the temperature difference between T1 and Ts.
  • Page 33 When T1-Ts≤0℃, transfer to medium speed, When T1-Ts>2℃, transfer to low speed. 8.4.3.3 Defrosting mode： 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 390s.
  • Page 34 10min. Condition 2: The current of compressor is more than I continuously more than 7s. The value of defrost is depending on the exactly machine. defrost Model defrost MS9V-07CR-QB6+MS9V-07HR-QB6 MS9V-09CR-QB6+MS9V-09HR-QB6 MS9V-12CR-QB6+MS9V-12HR-QB6 MS9V-18CR-QB + MS9V-18HR-QB6 Defrosting actions： Setti ng defro sting time 7.5m in Compresso r O ff...
  • Page 35 TE7=60℃,TE8=53℃,TE9=50℃ for 9k model. TE7=60℃,TE8=53℃,TE9=52℃ for 12k model. TE7=63℃,TE8=53℃,TE9=52℃ for 18k model. 8.4.4 Auto-mode This mode can be chosen by remote controller and the setting temperature can be changed between 17~30 ℃. In auto mode, the machine will choose cooling, heating or fan-only mode according to the difference between T1 and Ts.
  • Page 36 stop, indoor fan in breeze speed. If the room temperature raised to higher than 13℃, recover the dehumidify mode. 8.4.6 Forced operation function 8.4.6.1 Enter forced operation function: Pressing the touch button once, the machine will transfer into forced auto mode, if pressing the button once again, the machine will turn into forced cooling mode, the third pressing will stop the unit, and the forth pressing is the start of the cycle of forced auto mode, forced cooling mode and stop.
  • Page 37 8.4.7.7 The tolerance of timer is 1 minute per hour. 8.4.8 Sleep function mode 8.4.8.1 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off. 8.4.8.2. Operation process in sleep mode is as follow: After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.
  • Page 38 stopped. 8.4.10.2 Orientation means after the original orientation action, the louver turn the middle position of upper limit position and lower limit position. 8.4.10.3 Vane adjustment, pressing the control button on the remote controller to make the vertical louver turn left and right. Each pressing, the louver will turn 6℃. If pressing the button during the original orientation, the louver will only turn 6℃after the original orientation action stopped regardless the pressing time.

  • Page 39: Troubleshooting

    9. Troubleshooting Safety Because of capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply. Electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) Bulb (25-40W) 9.1 Indoor Unit Error Display Display...

  • Page 40: Diagnosis And Solution

    Zero-Crossing Error Indoor fan speed out of control Over current protection occurs 4 times Open or short circuit of Room temperature sensor Evaporator temperature sensor open or short circuit 9.2 Diagnosis and Solution 9.2.1 E1 (EEPROM parameter error) error diagnosis and solution Shut off the power supply and turn on it 5s later Replace indoor PCB The problem comes out again...
  • Page 41 9.2.2 E2 （Zero-Crossing Error） Zero-crossing error Unplug the power cord and plug it after 2 seconds The problem remains Replace the main PCB...
  • Page 42 9.2.3 E3(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 fan. Disassemble the connection between fan Does it rotate freely? and motor, check if the bearing is normal.
  • Page 43 9.2.4 E4 (Over current protection occurs 4 times) Current protection → Repair the power → Check if the voltage of power The power supply is supply problematic supply is too low ↓ Check if the operation condition → correct the operation is normal, especially the outdoor condition unit?

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