Midea 9V SERIES Service Manual Download Page 31 | Manualshive

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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.

Auto fan in cooling mode acts as follow:

8.4.2.3 Evaporator low temperature T2 protection.

When T2<

TE5

continuous for 5 min, the compressor and outdoor fan will stop and restart until

T2>

TE6

.

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Summary of Contents for 9V SERIES

Page 1: ...9VSAP 1010 A SERVICE MANUAL MIDEA AIRCONDITIONER On Off SPLIT WALL MOUNTED TYPE 9V SERIES 9220 9221...

Page 2: ...ng the cables 18 6 3 Pipe length and the elevation 18 6 4 Air purging with vacuum pump 19 6 5 Pumping down Re installation 20 6 6 Re air purging Re installation 22 6 7 Balance refrigerant of the 2 way...

Page 3: ...an Authorized service center Do not disassemble or repair the product there is risk of fire or electric shock Always ground the product There is risk of fire or electric shock Install the panel and th...

Page 4: ...ake care to ensure that power cable could not be pulled out or damaged during operation There is risk of fire or electric shock Do not place anything on the power cable There is risk of fire or electr...

Page 5: ...orized service center There is risk of fire or electric shock Be caution that water could not enter the product There is risk of fire electric shock or product damage Ventilate the product from time t...

Page 6: ...air for long periods of time Do not sit in the draft This could harm to your health Do not use the product for special purposes such as preserving foods works of art etc It is a consumer air conditio...

Page 7: ...or ladder when cleaning or maintaining the product Be careful and avoid personal injury Replace the all batteries in the remote control with new ones of the same type Do not mix old and mew batteries...

Page 8: ...Off 7k MS9V 07CR QB6 MOK2 07C QB6 9k MS9V 09CR QB6 MOK6 09C QB6 12k MS9V 12CR QB6 MOA1 12C QB6 18k MS9V 18CR QB MOB 18C QB6 Cooling Heating Series Capacity Indoor units Outdoor units On Off 7k MS9V 07...

Page 9: ...ure Indoor fan is delayed for 5 sec at the starting Restarting is for approx 3 minutes Auto Restart Function High med low auto The unit will decide the louver direction according to operation mode The...

Page 10: ...efficiency at operation mode Hydrophilic aluminum fin for heat pump models It is only operated in the heating operation mode except defrosting operation Anti rust cabinet Valve protection cover 4 way...

Page 11: ...Unit Dimension Mode W H D MS9V 07CR QB6 MS9V 07HR QB6 845 290 165 MS9V 09CR QB6 MS9V 09HR QB6 845 290 165 MS9V 12CR QB6 MS9V 12HR QB6 845 290 165 MS9V 18CR QB MS9V 18HR QB6 995 292 200 For smaller tha...

Page 12: ...9C QB6 MOK3 09H QB6 Dimension Mode W D H W1 A B 7K 9K 685 260 430 742 460 276 MOA1 12C QB6 MOB 12H QB6 MOB 18C QB6 MOB 18H QB6 Dimension Mode W D H W1 A B MOA1 12C QB6 700 235 535 760 458 250 MOB 12H...

Page 13: ...11 4 Refrigerant Cycle Diagram Cooling only Heat pump mode...

Page 14: ...12 5 Wiring Diagram 5 1 Indoor Unit Cooling only...

Page 15: ...13 Cooling Heating...

Page 16: ...14 5 2 Outdoor Unit Smaller than 18K model Cooling only...

Page 17: ...15 Cooling Heating...

Page 18: ...16 For 18 K model Cooling only...

Page 19: ...17 Cooling Heating...

Page 20: ...0 459kgf cm 4700 479kgf cm 6 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Grade Unit 7K 9K 12K 18K mm2 1 5 1 5 1 5 2 5 6 3 Pipe...

Page 21: ...rops Moisture in the refrigerant circuit may freeze and block capillary tubing Water may lead to corrosion of parts in the refrigerant system Therefore the indoor units and the pipes between indoor an...

Page 22: ...the vacuum pump Make evacuation for 15 minutes or more and check the compound meter indicates 76cmHg 6 Turn the stem of the Hi valve about 45 counterclockwise for 6 or 7seconds after the gas coming o...

Page 23: ...with the push pin to the gas service port 5 Air purging of the charge hose Open the low pressure valve on the charge set slightly to purge air from the charge hose 6 Set the 2 way valve to the close p...

Page 24: ...ge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut t...

Page 25: ...y valve s service port Leave the valve on the charge set closed Connect the charge hose with the push pin to the service port 3 Open the valves Low side on the charge set and discharge the refrigerant...

Page 26: ...ved 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...

Page 27: ...ow side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant if can be charged with a little at a time approximately...

Page 28: ...For special tropical models 7 24 11 43 21000Btu h models 18 43 21000Btu h models 21 52 For special tropical models CAUTION 1 If air conditioner is used outside of the above conditions certain safety p...

Page 29: ...s defrosting automatically or when the warm air control feature is activated in heating mode TURBO operation display Illuminated when select TURBO function in cooling operation or in heating operation...

Page 30: ...5Min 10 5A I3Sec 12A for 12K model IRestore 12A IFan 14A I5Min 15A I3Sec 17A for 18K model 8 3 3 Fan Speed is out of control When indoor fan speed is too low lower than 300RPM for 50 seconds the unit...

Page 31: ...wing 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 Auto fan in cooling mode acts as follow 8 4 2 3...

Page 32: ...d Ts When T1 Ts 3 the compressor and outdoor fan will stop and restart until T1 Ts 2 During the 7min operation all the protections are valid 8 4 3 2 Indoor fan running rules Indoor fan speed can be se...

Page 33: ...is breezing or stopped start defrosting While THDEFROST 14 TMDEFROST 15 TLDEFROST 16 for 7K model THDEFROST 15 TMDEFROST 16 TLDEFROST 17 for 9K and 12K model THDEFROST 17 TMDEFROST 18 TLDEFROST 19 fo...

Page 34: ...efrosting actions Compressor 4 way valve Outdoor fan Indoor fan On Off On Off On Off On Off 45s 40s 10s 25S 23s 7 5min Setting defro sting time During the defrosting mode if the machine stopped or tra...

Page 35: ...tive 3 After setting the mode AC will run in auto mode if the compressor keeps not running for 15 minutes 8 4 5 Dehumidify mode 8 4 5 1 Indoor fan speed is depended on compressor compressor starts ind...

Page 36: ...fter 30min the unit will transfer into dehumidify mode All the protections are valid during forced cooling mode Forced auto mode The action of forced auto mode is the same as normal auto mode with 24...

Page 37: ...stop until reaches the setting time in sleep mode 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 su...

Page 38: ...the moving If indoor fan stopped the horizontal swing is invalid 8 4 11 8 Heating Control by remote control In heating operation the preset temperature of the air conditioner can be as lower as 8 whi...

Page 39: ...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 CAUTIO...

Page 40: ...sor E6 Evaporator temperature sensor open or short circuit 9 2 Diagnosis and Solution 9 2 1 E1 EEPROM parameter error error diagnosis and solution Replace indoor PCB Shut off the power supply and turn...

Page 41: ...39 9 2 2 E2 Zero Crossing Error Zero crossing error Unplug the power cord and plug it after 2 seconds Replace the main PCB The problem remains YES...

Page 42: ...fan Does it rotate freely NO Disassemble the connection between fan and motor check if the bearing is normal If not change the bearing If yes follow the below step Replace the fan motor YES Replace t...

Page 43: ...he units and check if the problem remains Repair the power supply The power supply is problematic Disconnect with the power and replace the main PCB Check if the operation condition is normal especial...

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