Midea 9ASI-A-1209 Service Manual
  1. Manuals
  2. Brands
  3. Midea Manuals
  4. Air Conditioner
  5. 9ASI-A-1209
  6. Service manual

Midea 9ASI-A-1209 Service Manual

Luna inverter series
Hide thumbs
Table of Contents

Advertisement

Quick Links

LUNA INVERTER SERIES
Service Manual 2012
9ASI-A-1209

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 9ASI-A-1209 and is the answer not in the manual?

Questions and answers

Related Manuals for Midea 9ASI-A-1209

Summary of Contents for Midea 9ASI-A-1209

  • Page 1 LUNA INVERTER SERIES Service Manual 2012 9ASI-A-1209...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................3 1.1 Safety Precaution ........................3 1.2 Warning ............................3 2. Function ................................ 7 3. Dimension ..............................8 3.1 Indoor Unit ........................... 8 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 the unit, be sure to read this service manual at first. 1.2 Warning Installation Do not use a defective or underrated circuit breaker.
  • 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. When the product is soaked, contact an authorized service center.
  • 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 Capacity Indoor units Outdoor units MS9AU-09HRDN1-QRC4W MOB-09HFN1-QRC4W MS9AU-12HRDN1-QRC4W MOB-12HFN1-QRC4W Inverter MS9AU-18HRDN1-QRC4W MOC-18HFN1-QRC4W MS9A-24HRDN1-QRC4W MOF-24HFN1-QRC4W Filter killer of formaldehyde 1W standby Ionizer+(O) Ionizer(O) 8 degree heating(O) Silver Ico Filter(O) Heat compensation(O) Vitamin C Filter(O) Self-diag.

  • Page 8: Dimension

    3. Dimension 3.1 Indoor Unit Model MS9AU-09HRDN1-QRC4W MS9AU-12HRDN1-QRC4W MS9AU-18HRDN1-QRC4W MS9A-24HRDN1-QRC4W...
  • Page 9 Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS9AU-09HRDN1-QRC4W 111.5 MS9AU-12HRDN1-QRC4W Φ65 MS9A-24HRDN1-QRC4W 118.5 Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MS9AU-18HRDN1-QRC4W 186.5 Φ65...

  • Page 10: Outdoor Unit

    3.2 Outdoor Unit More than 30cm More than 60cm (Service space More than 30cm More than 60cm More than 70cm Model MOB-09HFN1-QRC4W MOB-12HFN1-QRC4W MOC-18HFN1-QRC4W MOF-24HFN1-QRC4W...

  • Page 11: 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 12: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Unit MS9AU-09HRDN1-QRC4W, MS9AU-12HRDN1-QRC4W, MS9AU-18HRDN1-QRC4W...
  • Page 13 MS9A-24HRDN1-QRC4W...

  • Page 14: Outdoor Unit

    5.2 Outdoor Unit MOB-09HFN1-QRC4W MOB-12HFN1-QRC4W, MOC-18HFN1-QRC4W...
  • Page 15 MOF-24HFN1-QRC4W...

  • Page 16: 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) Ф15.9 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 17: 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) MS9AU-09HRDN1-QRC4W+MOB-09HFN1-QRC 3/8’’ 1/4’’ (Ф9.52) (Ф6.35) MS9AU-12HRDN1-QRC4W+MOB-12HFN1-QRC MS9AU-18HRDN1-QRC4W+MOC-18HFN1-QRC 1/2’’ 1/4’’ (Ф12.7) (Ф6.35) MS9A-24HRDN1-QRC4W+MOF-24HFN1-QRC4 5/8’’...

  • Page 18: 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 19 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 20 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 21: 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 22: 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 23 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 24: 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 Be sure to use a hexagonal wrench to operate the valve stems.
  • Page 25 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 26 Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage...

  • Page 27: Operation Characteristics

    7. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode Room temperature ≥17℃ ≤30℃ ＞10℃ 0℃～50℃ -15℃～50℃ Outdoor temperature -15℃～30℃ 0℃～50℃ (For the models with low temperature cooling system) 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.

  • Page 28: 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. Lights up during the auto operation. AUTO indication lamp Lights up during Timer operation.

  • Page 29: Main Protection

    8.3 Main Protection 8.3.1 Time delay at restart for compressor 1 minute delay for the 1 time start-up and 3 minutes delay for others. 8.3.2 Temperature protection of compressor top The unit will stop working when the compressor top temp. protector cut off, and will restart after the compressor top temp.
  • Page 30 If T4＞5℃ or the compressor starts running, the preheating function will stop. 8.3.8 Zero crossing detection error protection(except MS9A-24HRDN1-QRC4W) If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will display the failure. The correct zero crossing signal time interval should be between 6-13ms. 8.3.9 Sensor protection at open circuit and breaking disconnection.
  • Page 31 continuous 4 seconds and this situation happens 3 times, the display area will show “EC” and AC will turn off.

  • Page 32: 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: For MS9A-24HRDN1-QRC4W: 27.5...
  • Page 33 8.4.2 Cooling Mode 8.4.2.1 Compressor running rules The maximum operation frequency of compressor after starting submits to following rule. Fmax=T4FREMAX1 Fmax=T4FREMAX2 Fmax=T4FREMAX3 Fmax=T4FREMAX4 Fmax=T4FREMAX5 Fmax=T4FREMAX6 Fmax=T4FREMAX7 Meanwhile, the maximum frequency is limited by the indoor fan speed. Indoor fan speed Maximum frequency High speed / turbo function No limit...
  • Page 34 T1-Ts -1.0 -1.5 While the zones of A,B,C... are corresponding to different compressor running frequency. Note: When T1-Ts keeps in the same temp. zone for 3 minutes, the compressor will run as the below rules: A:Increase the frequency to 3 grade higher until to FREMAX. B~E: Increase the frequency to 2 grade higher until to FREMAX.
  • Page 35 8.4.2.2 Outdoor fan running rules Cooling While A,B,C…means different fan speed of outdoor unit. 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, auto and silent. When the compressor is running, the indoor fan is controlled as below:...
  • Page 36 The auto fan acts as below rules: For MS9A-24HRDN1-QRC4W: 27.5 High Medium 25.5 For other models: T1-Ts (H -L)*0.75+L (H -L)*0.5+L (H -L)*0.25+L 8.4.2.4 Condenser temperature protection ---55℃<T3<60℃, the compressor frequency will decrease to the lower level until to F1 and then runs at F1.If T3<54℃, the compressor will keep running at the current frequency.
  • Page 37 8.4.3 Heating Mode 8.4.3.1 Compressor running rules The maximum operation frequency of the compressor after starting submits to the following rule. Fmax=T4FREHEATMAX1 Fmax=T4FREHEATMAX2 Fmax=T4FREHEATMAX3 Fmax=T4FREHEATMAX4 Fmax=T4FREHEATMAX5 Fmax=T4FREHEATMAX6 Fmax=T4FREHEATMAX7 Fmax=T4FREHEATMAX8 Fmax=T4FREHEATMAX9 Fmax=F21 Fmax=F22 Fmax=F23 Fmax=F24 Fmax=F25...
  • Page 38 Meanwhile, the maximum frequency is limited by the indoor fan speed. Indoor fan speed Maximum frequency High speed/8 degree heating/ turbo function No limit Medium speed FHeatMaxMidFan Low speed/sleep mode FHeatMaxLowFan Silent mode Fixed at F3 If users switch on AC by remote controller, the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp.
  • Page 39 Meanwhile, the compressor running frequency is limited by the current. HeatT4Zone4I HeatT4Zone3I HeatT4Zone2I HeatT4Zone1I 8.4.3.2 Outdoor fan running rules Heating 8.4.3.3 Indoor fan running rules In heating mode, indoor fan can be selected as high, medium, low, auto and silent. The anti-cold- wind function is preferential.
  • Page 40 If the compressor stops caused by the room temperature rising, the indoor fan will be forced to run 127 seconds with breeze. During this period, the anti-cold-wind is disabled. Auto fan action in heating mode: For MS9A-24HRDN1-QRC4W: T1-Ts Medium High For other models: T1-Ts+¦...
  • Page 41 8.4.3.4 Defrosting mode Condition of defrosting: If any one of the following items is satisfied, AC will enter the defrosting mode. After the compressor starts up and keeps running, mark the minimum value of T3 from the 10th minutes to 15th minutes as T30. 1)If the compressor cumulate running time is up to 29 minutes and T3<...
  • Page 42 Defrosting action： For MS9AU-09HRDN1-QRC4W, MS9AU-12HRDN1-QRC4W Frequency F3 FrequencyF16 Compressor 4-way valve Outdoor fan Indoor fan Indoor fan breeze(10s) no longer than 10m xx=60 For MS9AU-18HRDN1-QRC4W, MS9A-24HRDN1-QRC4W Frequency F3 Frequency F16 Compressor 4-way valve Outdoor fan Indoor fan Indoor fan breeze(10s) no longer than 10m xx=90...
  • Page 43 8.4.3.5 Evaporator coil temperature protection TEstop Decrease TEdown Hold TEnorm Resume Off: Compressor stops. Decrease: Decrease the running frequency to the lower level. Hold: Keep the current frequency. Resume: No limitation for frequency. 8.4.4 Auto-mode This mode can be chosen with remote controller and the setting temperature can be changed between 17~30 ℃...
  • Page 44 T1-Ts 8.4.5.3 Low indoor room temperature protection In drying mode, if room temperature is lower than 10 ℃ , the compressor will stop and not resume until room temperature exceeds 12 ℃ . 8.4.5.4 Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit frequency limit are active and the same as that in cooling mode.
  • Page 45 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” 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”...
  • Page 46 8.4.10 8℃ Heating(optional) In heating operation, the preset temperature of the air conditioner can be as lower as 8 ℃ , which keeps the room temperature steady at 8 ℃ and prevents household things freezing when the house is unoccupied for a long time in severe cold weather.

  • Page 47: Troubleshooting

    9. Troubleshooting 9.1 Indoor Unit Error Display Display LED STATUS EEPROM parameter error Indoor / outdoor units communication protection Zero-crossing signal error(except MS9A-24HRDN1-QRC4W) Indoor fan speed has been out of control Indoor room temperature sensor open circuit or short circuit Evaporator coil temperature sensor open circuit or short circuit Refrigerant leakage detection Outdoor ambient temperature sensor open circuit or short circuit...

  • Page 48: Diagnosis And Solution

    9.2 Diagnosis and Solution 9.2.1 EEPROM parameter error diagnosis and solution(E0)
  • Page 49 9.2.2 Indoor unit and outdoor unit communication protection error diagnosis and solution(E1)
  • Page 50 9.2.3 Zero crossing detection error diagnosis and solution(E2) 9.2.4 Indoor fan speed has been out of control diagnosis and solution(E3)
  • Page 51 9.2.5 Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3)
  • Page 52 9.2.6 Refrigerant Leakage Detection diagnosis and solution(EC) Shut off the power supply and turn it on 5 seconds later. Is it still displaying the error code? Check if T2 sensor is well Is there cool air blowing fixed. Correct the installation or replace T2 sensor.
  • Page 53 9.2.7 Outdoor fan speed has been out of control diagnosis and solution(F5)
  • Page 54 9.2.8 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Check if the wiring between module PCB and compressor Correct the connection. connected correctly. IPM continuity check. Check if the IPM Replace the module PCB. terminal resistance values are uniform. Correct the installation, tighten the Check if the IPM installed correctly.
  • Page 55 9.2.9 Over voltage or too low voltage protection diagnosis and solution(P1) Check if the power Disconnect the unit with power supply and try to supply is normal. restart the unit when power supply gets normal. C h e c k i f a l l t h e Correct the connections.
  • Page 56 Safety Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) Connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, - terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.
  • Page 57 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. Table 1:Some frequently-used R-T data for T1,T2,T3 and T4 sensor: Temperature (℃) Resistance Value (KΩ) 26.9...

This manual is also suitable for:

9asi-a-1301

Table of Contents