Midea MS9A-09HRDN1-MP0W Service Manual
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Midea MS9A-09HRDN1-MP0W Service Manual

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9ASUL-A1-1211

SERVICE MANUAL

MIDEA AIRCONDITIONER
DC INVERTER
SPLIT WALL-MOUNTED TYPE

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Summary of Contents for Midea MS9A-09HRDN1-MP0W

  • Page 1: Service Manual

    9ASUL-A1-1211 SERVICE MANUAL MIDEA AIRCONDITIONER DC INVERTER SPLIT WALL-MOUNTED TYPE...

  • 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 ..........................11 4. Refrigerant Cycle Diagram ........................12 5. Wiring Diagram ............................14 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  Keep level even when installing the product. 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. ...
  • Page 7 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.  Do not drink the water drained from the product. It is not sanitary could cause serious health issues.

  • Page 8: Function

    2. Function Model Names of Indoor/Outdoor Units Capacity Model Indoor units Outdoor units MS9A-09HRDN1-MP0W MS9A-09HRDN1-MP0W MOC-09HDN1-MP0W MS9A-09CRDN1-BS0W MS9A-09CRDN1-BS0W MOC-09CFN1-BS0W MS9A-09HRDN1-BS0W MS9A-09HRDN1-BS0W MOC-09HRFN1-BS0W MS9A-09HRDN1-BQ0W MS9A-09HRDN1-BQ0W MOC-09HFN1-BQ0W MS9A-12HRDN1-MP0W MS9A-12HRDN1-MP0W MOC-12HDN1-MP0W MS9A-12CRDN1-BS0W MS9A-12CRDN1-BS0W MOC-12CFN1-BS0W MS9A-12CRDN1-MS0W MS9A-12CRDN1-MS0W MOC-12CRDN1-MS0W MS9A-12HRDN1-BS0W MS9A-12HRDN1-BS0W MOC-12HRFN1-BS0W DC Inverter MS9A-12HRDN1-MS0W...
  • Page 9 Filter killer of formaldehyde Ionizer+(O) Ionizer(O) Plasma(O) Heat compensation(O) Silver Ico Filter(O) Self-diag. function Vitamin C Filter(O) Hydrophilic aluminum fin 3M HAM Filter(O) Anti-rust cabinet Bio Filter(O) Valve protection cover Golden Fin(O) PTC Heating Belt(O) 8 degree heating(O) Compressor Crankcase Heater(O) O: optional function...

  • Page 10: Dimension

    3. Dimension 3.1 Indoor Units Model W(mm) H(mm) D(mm) MS9A-09HRDN1-MP0W MS9A-09HRDN1-BQ0W (31.10in) (10.43in) (7.80in) MS9A-09CRDN1-BS0W MS9A-09HRDN1-BS0W MS9A-12HRDN1-MP0W MS9A-12CRDN1-BS0W MS9A-12HRDN1-BS0W (36.22in) (11.50in) (8.78in) MS9A-12CRDN1-MS0W MS9A-12HRDN1-MS0W MS9A-12HRDN1-BS0W(B) MS9A-18HRDN1-MP0W MS9A-18CRDN1-MS0W MS9A-18HRDN1-MS0W (39.29in) (12.68in) (9.45in) MS9A-24HRDN1-MP0W MS9A-24CRDN1-MP0W 1450 MS9A-24HRDN1-MS0W (57.09in) (13.39in) (10.43in)
  • Page 11 Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) MS9A-09HRDN1-MP0W Φ65 MS9A-09HRDN1-BQ0W Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) MS9A-09CRDN1-BS0W MS9A-09HRDN1-BS0W Φ65 MS9A-12HRDN1-MP0W MS9A-12CRDN1-BS0W MS9A-12HRDN1-BS0W...
  • Page 12 MS9A-12CRDN1-MS0W MS9A-12HRDN1-MS0W MS9A-12HRDN1-BS0W(B) Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) MS9A-18HRDN1-MP0W MS9A-18CRDN1-MS0W Φ65 MS9A-18HRDN1-MS0W MS9A-24HRDN1-MP0W MS9A-24CRDN1-MP0W Model L(mm) H(mm) Dimension of installation hole(mm) Φ95 120.5 MS9A-24HRDN1-MS0W...

  • Page 13: Outdoor Units

    3.2 Outdoor Units More than 30cm More than 60cm (Service space) More than 30cm More than 60cm More than 70cm W(mm) D(mm) H(mm) W1(mm) A(mm) B(mm) Model MOC-09HDN1-MP0W MOC-09CFN1-BS0W MOC-09HRFN1-BS0W MOC-09HFN1-BQ0W MOC-12HDN1-MP0W (29.92in) (11.22in) (23.23in) (32.40in) (20.87in) (11.42in) MOC-12CFN1-BS0W MOC-12CRDN1-MS0W MOC-12HRFN1-BS0W MOC-12HRFN1-MS0W MOC-12HFN1-BS0W...

  • Page 14: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram For cooling only models: INDOOR OUTDOOR LIQUID SIDE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE COMPRESSOR...
  • Page 15 For heat pump models: 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 16: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Units MS9A-09HRDN1-MP0W; MS9A-12HRDN1-MP0W; MS9A-12CRDN1-MS0W; MS9A-12HRDN1-MS0W MS9A-09CRDN1-BS0W; MS9A-09HRDN1-BS0W; MS9A-12CRDN1-BS0W; MS9A-12HRDN1-BS0W...
  • Page 17 MS9A-18HRDN1-MP0W;MS9A-18CRDN1-MS0W;MS9A-18HRDN1-MS0W; MS9A-24HRDN1-MP0W...
  • Page 18 MS9A-09HRDN1-BQ0W MS9A-12HRDN1-BS0W(B)
  • Page 19 MS9A-24CRDN1-MP0W...
  • Page 20 MS9A-24HRDN1-MS0W...

  • Page 21: Outdoor Units

    5.2 Outdoor Units MOC-09HDN1-MP0W;MOC-12HDN1-MP0W MOC-09CFN1-BS0W; MOC-09HRFN1-BS0W; MOC-12CFN1-BS0W; MOC-12HRFN1-BS0W...
  • Page 22 MOC-12CRDN1-MS0W MOC-12HRFN1-MS0W...
  • Page 23 MOF-18HDN1-MP0W MOF-18CRFN1-MS0W...
  • Page 24 MOF-18HRFN1-MS0W MOG-24HDN1-MP0W...
  • Page 25 MOC-09HFN1-BQ0W, MOC-12HFN1-BS0W MOF-24HDN1-MP0W...
  • Page 26 MOG-24HDN1-MS0W MOF-24CDN1-MP0W...

  • Page 27: 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)

  • Page 28: Connecting The Cables

    6.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located on the side panel of the unit. Please refer to the nameplate before selecting the cable, fuse and switch.

  • Page 29: Pipe Length And The Elevation

    6.3 Pipe length and the elevation The pipe length and refrigerant amount: Model Connective pipe Air purging method Additional amount of refrigerant to be charged length Less than 5m Use vacuum pump ------------------ (Pipe length – 5) × 20g/m 9k/12k More than 5m Use vacuum pump (Pipe length –...

  • Page 30: 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 31 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 32 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: 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 34: 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 35 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 36: 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 37 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 38 Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage.

  • Page 39: Operation Characteristics

    7. Operation characteristics Temperature Cooling operation Heating operation Drying operation Mode Room temperature ≥17℃(62℉) ≤30℃(86℉) ＞10℃(50℉) 0℃～50℃ (32℉～122℉) -15℃～30℃ 0℃～50℃ Outdoor temperature -15℃～50℃(5℉～122℉) (5℉～86℉) (32℉～122℉) (For the models with low temperature cooling system) CAUTION: 1. If air conditioner is used outside of the above conditions, certain safety protection features may come into operation and cause the unit to function abnormally.

  • Page 40: 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. OPERATION indication lamp: This lamp illuminates when the air conditioner is in operation.

  • Page 41: Main Protection

    DEFROST indication lamp (For cooling & heating models only): Lights up when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating operation. DIGITAL DISPLAY: Displays the current setting temperature and malfunction/protection code when the air conditioner is in operation.

  • Page 42: Operation Modes And Functions

    8.3.6 Indoor fan delayed open function When the unit starts up, the louver will be active immediately and the indoor fan will open 10s later. If the unit runs in heating mode, the indoor fan will be also controlled by anti-cold wind function. 8.3.7 Compressor preheating functions Preheating permitting condition: If T4(outdoor ambient temperature)＜3℃...
  • Page 43 8.4.2 Cooling Mode 8.4.2.1 Compressor running rules: The operation frequency of compressor after starting submits to following rule. Fmax=F4 Fmax=F7 Fmax=F8 Fmax=F6 Fmax=F3 If users switch on AC by remote controller, the compressor will run at the Fmax frequency for 7 minutes according to the outdoor ambient temp.
  • Page 44 G: Decrease the frequency to the lower level until to F1. H: Run at F1 for 1h.(if T1-Ts<-2℃, the compressor will stop) Meanwhile, the compressor running frequency is limited by the current. I3COOL Decrease I2COOL Hold I1COOL Resume Off: Compressor stops. Decrease: Decrease the running frequency to the lower level.
  • Page 45 High Medium 8.4.2.4 Condenser high temperature T3 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. ---T3<52℃, the compressor will not limit the frequency and resume to the former frequency. ---T3>60℃...
  • Page 46 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=F2 Fmax=F3 Fmax=F4 Fmax=F5 Fmax=F6 Fmax=F7 Fmax=F8 Fmax=F9 Fmax=F10 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 47 +5.0 +4.5 +3.5 +3.0 +2.5 +2.0 +1.5 +1.0 +0.5 While the zones of A,B,C... are corresponding to different compressor running frequency. ΔT=0℃ as factory setting. Note: When T1-Ts keeps in the same temp. zone for 3 minutes, the compressor will run as the below rules: A~E: Increase the frequency to the higher level until to F10.
  • Page 48 Hold: Keep the current frequency. Resume: No limitation for frequency. Note: When AC is in “hold” zone for 3 minutes, the compressor frequency will rise to the higher level. (The frequency will increase twice at most) 8.4.3.2 Outdoor fan running rules: High 8.4.3.3 Indoor fan running rules: For 9k,12k,...
  • Page 49 For other models: Setting Breeze 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. If the machine runs in rating capacity test mode, the indoor fan will run with rating speed and the anti-cold-wind function is disabled.
  • Page 50 minutes. ----T4＜0℃, If the 1 condition and 2 condition items are satisfied, then the program judges if T2 has decreased more than 5℃.When T2 has decreased more than 5℃, enter the defrosting mode. ----No matter what value T4 is, if the machine runs with T3＜3℃ for more than 120 minutes and T3 keeps lower than TCDI+4℃...
  • Page 51 Defrosting action： For 18k, 24k models: Frequency F2 Frequency F8 Compressor 4-way valve Outdoor fan Indoor fan Indoor fan breeze(10s) no longer than 10m Model MS9A-18HRDN1-MS0W, MS9A-24HRDN1-MS0W MS9A-18HRDN1-MP0W MS9A-24HRDN1-MP0W MS9A-24CRDN1-MP0W...
  • Page 52 For other models: Frequency F2 FrequencyF8 Compressor 4-way valve Outdoor fan Indoor fan Indoor fan breeze(10s) no longer than 10m XX=60. 8.4.3.5 Evaporator coil temperature protection ----T2> TEH2℃, the compressor running frequency decreases to the lower level and runs for 20s. When the frequency decreases to F2 and the T2 is still over TEH2℃...
  • Page 53 -1<ΔT≤1℃ Fan-only ΔT≤-1℃ Heating Indoor fan will run at auto fan of the relevant mode. The louver operates same as in relevant mode. If the machine switches mode between heating and cooling, the compressor will keep stopping for 15 minutes and then choose mode according to T1-Ts. If the setting temperature is modified, the machine will choose running function again.
  • Page 54 machine. 8.4.6.2 In forced operation mode, all general protections and remote control are available. 8.4.6.3 Operation rules: Forced cooling mode: The compressor runs at F2 frequency and indoor fan runs as breeze. After running for 30 minutes, the machine will turn to auto mode as 24℃ setting temperature. Forced auto mode: The action of forced auto mode is the same as normal auto mode with 24℃...
  • Page 55 timing is less than 7 hours, sleep function will be cancelled when reaching the setting time. If the timing is more than 7 hours, the machine will not 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.

  • Page 56: Troubleshooting

    9. Troubleshooting 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: Indoor Unit Error Display

    9.1 Indoor Unit Error Display Display LED STATUS EEPROM parameter error Indoor / outdoor units communication protection Zero-crossing signal error Indoor fan speed has been out of control Open circuit or short circuit of outdoor temperature sensor or outdoor unit EEPROM parameter error Open circuit or short circuit of room or evaporator temperature sensor Outdoor fan speed has been out of control(only for...
  • Page 58 E4 : Reserved function.

  • Page 59: Outdoor Unit Error Display

    9.2 Outdoor unit error display LED1 LED4 (red) LED5 & LED6 (red) (green) standby operating LED1 slow flashing LED4 The picture of PCB above is only for reference. LED 4 is a red light and for the PCB POWER display. LED 1 is a yellow light.
  • Page 60 Over voltage or too low voltage protection ☆ Over voltage or too low voltage protection ☆ Inverter compressor drive error ☆ Inverter compressor drive error ☆ ☆ Inverter compressor drive error ☆ （2.5Hz flash） O（light） X（off）...

  • Page 61: Diagnosis And Solution

    9.3 Diagnosis and Solution 9.3.1 EEPROM parameter error diagnosis and solution(E0) Shut off the power supply and turn it on 5 seconds later. Is it still displaying the error code? If the EEPROM chip is welded on main PCB, replace the main PCB directly.
  • Page 62 9.3.2 Indoor / outdoor units communication diagnosis and solution(E1) 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 63 9.3.3 Zero crossing detection error diagnosis and solution(E2) Check if the connections and Correct the connections. Turn on the power supply is normal? unit when the power supply is good. Indoor main PCB is defective. Replace indoor main PCB. 9.3.4 Fan speed has been out of control diagnosis and solution(E3/E7) Shut off the power supply and turn it on 5 seconds The unit operates normally.
  • Page 64 Index 1: 1.Indoor AC Fan Motor Measure the resistance value of each winding by using the tester. For the definite value of the resistance, contact the technical engineer. 2.Outdoor DC Fan Motor(control chip is in fan motor) Measure the resistance value of each winding by using the tester. If any resistance value is zero, the fan motor must has problems and need to be replaced.
  • Page 65 DC motor voltage input and output Color Signal Voltage Vs/Vm 280V~380V Black White 14-17.5V Yellow 0~5.6V Blue 14-17.5V...
  • Page 66 9.3.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5/E6) Check the connections between temperature sensor and main PCB. Correct the connections. Are the connections good? Check the resistance value Replace indoor or outdoor main of the sensor via table1 PCB.
  • Page 67 9.3.6 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Check if the wiring between main Correct the connection or PCB and compressor connected by replace the wires and error and if the wires and connectors connectors. are broken? Correct the installation, Check if the IPM installed correctly.
  • Page 68 9.3.8 Over voltage or too low voltage protection diagnosis and solution(P1) Disconnect the unit with power Check if the power supply is supply and try to restart the unit normal. when power supply gets normal. Check if all the connections Correct the connections or replace and wires are good? the wires.
  • Page 69 9.3.9 High temperature protection of compressor top diagnosis and solution(P2) Check if the air flow system Clear up the air inlet and outlet or the heat of indoor and outdoor units exchanger of indoor and outdoor units. are obstructed? Turn off the power supply and turn it on 10 minutes later.
  • Page 70 9.3.10 Inverter compressor drive error diagnosis and solution(P4) Check if the wiring between main Correct the connection or PCB and compressor connected by replace the wires and error and if the wires and connectors connectors. are broken? Correct the installation, Check if the IPM installed correctly.
  • Page 71 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.
  • Page 73 Appendix: ℃ ℃ ℃ ℃...

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