Midea MS11M-09HRN1 Service Manual
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Midea MS11M-09HRN1 Service Manual

Oasis on-off series
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DM12-01.01.09en
OASIS On-off SERIES
Service Manual 2012
MS11M-09HRN1 / MO11M-09HN1
MS11M-12HRN1 / MO11M-12HN1
MS11M-18HRN1 / MO11M-18HN1
MS11M-24HRN1 / MO11M-24HN1
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  • Page 1 DM12-01.01.09en OASIS On-off SERIES Service Manual 2012 MS11M-09HRN1 / MO11M-09HN1 MS11M-12HRN1 / MO11M-12HN1 MS11M-18HRN1 / MO11M-18HN1 MS11M-24HRN1 / MO11M-24HN1...

  • Page 2: Table Of Contents

    Oasis On-off DM12-01.01.09en CONTENTS   1. Precaution ..............................3 1.1 Safety Precaution ........................3   1.2 Warning ............................3     2. Function ................................ 7   3. Specification ..............................8   4. Dimension ..............................12 4.1 Indoor Unit ..........................12   4.2 Outdoor Unit ..........................

  • Page 3: Precaution

    DM12-01.01.09en Oasis On-off 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.
  • Page 4 Oasis On-off DM12-01.01.09en  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 DM12-01.01.09en Oasis On-off  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. There is risk of fire or electric shock.
  • Page 6 Oasis On-off DM12-01.01.09en  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

    DM12-01.01.09en Oasis On-off 2. Function Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units MS11M-09HRN1 MO11M-09HN1 On-Off MS11M-12HRN1 MO11M-12HN1 MS11M-18HRN1 MO11M-18HN1 MS11M-24HRN1 MO11M-24HN1 Indoor unit  Filter  Killer of Formaldehyde  Plasma  Silver Ion Filter  Self-Clean ...

  • Page 8: Specification

    Oasis On-off DM12-01.01.09en 3. Specification Indoor  MS11M-09HRN1 MS11M-12HRN1 Outdoor  MO11M-09HN1 MO11M-12HN1 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph Power supply  Ph‐V‐Hz  9000 12000 Btu/h  Capacity    2,64 3,52 kW  1090 Cooling  Input    W  Rated current    A  3.22 3.23 EER    W/W ...
  • Page 9 DM12-01.01.09en Oasis On-off 830x270x355 910x270x355 Packing      (W*D*H)  mm  8 / 10 9 / 11 Net/Gross weight      Kg  YDK24-6F(B) YDK36-6 Model       Welling Welling Brand       Outdoor fan  Input                        W ...
  • Page 10 Oasis On-off DM12-01.01.09en Indoor  MS11M-18HRN1 MS11M-24HRN1 Outdoor  MO11M-18HN1 MO11M-24HN1 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph Power supply  Ph‐V‐Hz  18000 24000 Btu/h  Capacity                                    5,28 7,03 kW ...
  • Page 11 DM12-01.01.09en Oasis On-off 12.5 / 15.5 16 / 20 Net/Gross weight      Kg  YDK55-6H YDK100-6D(B) Model       Welling Welling Brand       Outdoor fan  Input                        W  motor  Capacitor                865 / -- / -- 875 / -- / -- Speed ...

  • Page 12: Dimension

    Oasis On-off DM12-01.01.09en 4. Dimension 4.1 Indoor Unit Model MS11M-09HRN1 MS11M-12HRN1 MS11M-18HRN1 1186 MS11M-24HRN1 Service manual...
  • Page 13 DM12-01.01.09en Oasis On-off Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) MS11M-09HRN1 ￠65 MS11M-12HRN1 Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) 134.6 ￠65 MS11M-18HRN1 Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) ￠65 MS11M-24HRN1 Service manual...

  • Page 14: Outdoor Unit

    Oasis On-off DM12-01.01.09en 4.2 Outdoor Unit More than 30cm More than 60cm (Service space More than 30cm More than 60cm More than 70cm Model MO11M-09HN1 MO11M-12HN1 MO11M-18HN1 MO11M-24HN1 Service manual...

  • Page 15: Capacity Tables

    DM12-01.01.09en Oasis On-off 5. Capacity tables MS11M-09HRN1 / MO11M-09HN1 Cooling Cooling Outdoor conditions (DB) Indoor Conditions (kW) 18ºC 21ºC 28ºC 35ºC 43ºC 2.85 2.72 2.59 2.46 2.35 21/15ºC DB/WB 2.05 2.01 1.99 1.96 1.97 Input 2.58 2.67 2.90 3.03 3.12 2.90...
  • Page 16 Oasis On-off DM12-01.01.09en MS11M-12HRN1 / MO11M-12HN1 Cooling Cooling Outdoor conditions (DB) Indoor Conditions (kW) 18ºC 21ºC 28ºC 35ºC 43ºC 3.80 3.63 3.45 3.27 3.13 21/15ºC DB/WB 2.74 2.68 2.66 2.62 2.63 Input 2.58 2.68 2.91 3.04 3.13 3.87 3.73 3.56 3.38 3.17 24/17ºC DB/WB...
  • Page 17 DM12-01.01.09en Oasis On-off MS11M-18HRN1 / MO11M-18HN1 Cooling Cooling Outdoor conditions (DB) Indoor Conditions (kW) 18ºC 21ºC 28ºC 35ºC 43ºC 5.70 5.44 5.17 4.91 4.70 21/15ºC DB/WB 4.11 4.02 3.98 3.93 3.95 Input 2.57 2.66 2.89 3.02 3.11 5.81 5.60 5.33 5.07 4.75 24/17ºC DB/WB...
  • Page 18 Oasis On-off DM12-01.01.09en MS11M-24HRN1 / MO11M-24HN1 Cooling Cooling Outdoor conditions (DB) Indoor Conditions (kW) 18ºC 21ºC 28ºC 35ºC 43ºC 7.59 7.24 6.89 6.54 6.26 21/15ºC DB/WB 5.47 5.36 5.30 5.23 5.26 Input 2.40 2.49 2.70 2.82 2.91 7.73 7.45 7.10 6.75 6.33 24/17ºC DB/WB...

  • Page 19: Refrigerant Cycle Diagram

    DM12-01.01.09en Oasis On-off 6. 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 Service manual...

  • Page 20: Wiring Diagram

    Oasis On-off DM12-01.01.09en 7. Wiring Diagram 7.1 Indoor Unit MS11M-09HRN1, MS11M-12HRN1 MS11M-18HRN1 Service manual...
  • Page 21 DM12-01.01.09en Oasis On-off MS11M-24HRN1 Service manual...

  • Page 22: Outdoor Unit

    Oasis On-off DM12-01.01.09en 7.2 Outdoor Unit MO11M-09HN1, MO11M-12HN1 MO11M-18HN1 Service manual...
  • Page 23 DM12-01.01.09en Oasis On-off MO11M-24HN1 Service manual...

  • Page 24: Installation Details

    Oasis On-off DM12-01.01.09en 8 Installation Details 8.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N.cm N.cm 6.35 1500(153kgf.cm) 1600(163kgf.cm) 9.52 2500(255kgf.cm) 2600(265kgf.cm) 12.7 3500(357kgf.cm) 3600(367kgf.cm) 16 4500(459kgf.cm) 4700(479kgf.cm) 19 6500(663kgf.cm) 6700(683kgf.cm) 8.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet.

  • Page 25: Pipe Length And The Elevation

    Standard Max. Max. Additional Model length Elevation Length refrigerant Liquid B (m) A (m) (g/m) 3/8’’ 1/4’’ MS11M-09HRN1 / MO11M-09HN1 9.53 6.35 MS11M-12HRN1 / MO11M-12HN1 1/2’’ 1/4’’ 12.7 6.35 MS11M-18HRN1 / MO11M-18HN1 5/8’’ 3/8’’ MS11M-24HRN1 / MO11M-24HN1 16.0 9.53 Caution: The capacity test is based on the standard length and the maximum permissive length is based on the system reliability.

  • Page 26: Installation For The First Time

    Oasis On-off DM12-01.01.09en 8.4 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 27 DM12-01.01.09en Oasis On-off 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 28 Oasis On-off DM12-01.01.09en 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 29: Adding The Refrigerant After Running The System For Many Years

    DM12-01.01.09en Oasis On-off 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 30: Re-Installation While The Indoor Unit Need To Be Repaired

    Oasis On-off DM12-01.01.09en 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 31 DM12-01.01.09en Oasis On-off 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 32: Re-Installation While The Outdoor Unit Need To Be Repaired

    Oasis On-off DM12-01.01.09en 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 33 DM12-01.01.09en Oasis On-off 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 34 Oasis On-off DM12-01.01.09en Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage Service manual...

  • Page 35: Operation Characteristics

    DM12-01.01.09en Oasis On-off 9. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode 10C～32C (<21000Btu/h models) Room temperature 17C～32 0C～30C 17C～32C (≥21000Btu/h models) 11C～43C (<21000Btu/h models) Outdoor temperature 18C～43C -7C～24C 18C～43C (≥21000Btu/h models) 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 36: Electronic Function

    Oasis On-off DM12-01.01.09en 10. Electronic function 10.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature 10.2 Display function 10.2.1 Icon explanation on indoor display board. FRESH indication lamp：This lamp illuminates when Clean Air feature is activated.

  • Page 37: Main Protection

    , the outdoor fan will shut off if AC is in heating mode. If AC is in cooling mode, the indoor fan will run at low speed. Model 3SEC 5min RESTORE MS11M-09HRN1 / 10.0 MO11M-09HN1 MS11M-12HRN1 / 10.0 MO11M-12HN1 MS11M-18HRN1 / 17.0...

  • Page 38: Operation Modes And Functions

    Oasis On-off DM12-01.01.09en 10.4 Operation Modes and Functions 10.4.1 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 the same as in cooling mode. (5) Auto fan: High Medium...
  • Page 39 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. Model TE5(℃) TE6(℃) MS11M-09HRN1 / MO11M-09HN1 MS11M-12HRN1 / MO11M-12HN1 MS11M-18HRN1 / MO11M-18HN1 MS11M-24HRN1 / MO11M-24HN1 Service manual...
  • Page 40 Oasis On-off DM12-01.01.09en 10.4.2.5 High condenser temperature T3 protection (MS11M-24HRN1 / MO11M-24HN1) When T3≥65℃, the compressor will stop and restart until T3<55℃. During the protection, the outdoor fan keeps working. 10.4.3 Heating Mode 10.4.3.1 Compressor running rules: Once the compressor starts up, it will run 7 minutes. And then it will follow the below rules: When indoor room temp.T1 is higher than Tj, the compressor and outdoor fan will shut off.
  • Page 41 DM12-01.01.09en Oasis On-off T2<TE4, the indoor fan will shut off. Setting While Model MS11M-09HRN1 / MO11M-09HN1 MS11M-12HRN1 / MO11M-12HN1 MS11M-18HRN1 / MO11M-18HN1 MS11M-24HRN1 / MO11M-24HN1 Auto fan action: When T1-Ts>2C, the indoor fan will run at low speed. When T1-Ts≤0C, the indoor fan will run at medium speed.
  • Page 42 Oasis On-off DM12-01.01.09en T2－T1 High speed ＜TH DEFROST Medium speed ＜TM DEFROST Low speed ＜TL DEFROST Breeze/off No need to compare the T2 and T1 B2: The compressor keeps running for 120 minutes or more, and the difference between evaporator coil temperature and room temperature meets one of the following: T2－T1 High speed...
  • Page 43 The air conditioner will not detect whether it needs to run at defrosting mode until the compressor has  run for no less than 6.5 minutes. Model MS11M-09HRN1 / MO11M-09HN1 MS11M-12HRN1 / MO11M-12HN1 MS11M-18HRN1 / MO11M-18HN1  Condition of ending defrosting:...
  • Page 44 Oasis On-off DM12-01.01.09en  Defrosting action： Model DF(s) MS11M-09HRN1 / MO11M-09HN1 MS11M-12HRN1 / MO11M-12HN1 MS11M-18HRN1 / MO11M-18HN1 For 24k model:  Condition of defrosting: AC will enter defrosting mode if any of the following items is satisfied. (1) If the compressor keeps running over 45 minutes. Meanwhile T3＜TC3 for 5minutes.
  • Page 45 DM12-01.01.09en Oasis On-off  Defrosting action： While TC2(℃) TC3(℃) DT1(min) DF(s) 10.4.3.5 High evaporator coil temp.T2 protection: Model MS11M-09HRN1 / MO11M-09HN1 MS11M-12HRN1 / MO11M-12HN1 MS11M-18HRN1 / MO11M-18HN1 Service manual...
  • Page 46 Oasis On-off DM12-01.01.09en For 24k model: TE7(℃) TE8(℃) TE9(℃) 10.4.4 Auto-mode This mode can be chosen with 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 ∆T (∆T =T1-Ts). ∆T=T1-Ts Running mode ∆T＞2℃...
  • Page 47 DM12-01.01.09en Oasis On-off The compressor and outdoor fan keep running and the indoor fan runs at low speed. After running for 30 minutes, AC will turn to auto mode with 24℃ setting temperature. Forced auto mode: The action of forced auto mode is the same as normal auto mode with 24℃ setting temperature. When AC receives signals, such as switch on, switch off, timer on, timer off, mode setting, fan ...
  • Page 48 Oasis On-off DM12-01.01.09en 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. 10.4.9 Auto-Restart function The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module.
  • Page 49 DM12-01.01.09en Oasis On-off the user press “Self Clean” button on remote controller, firstly, indoor unit runs in fan only mode for a while, then low heat operation and finally runs in fan only again. This function can keep the inside of indoor unit dry and prevent breeding of mold.

  • Page 50: Troubleshooting

    Oasis On-off DM12-01.01.09en 11. Troubleshooting 11.1 Indoor Unit Error Display Operation lamp Timer lamp Display LED STATUS EEPROM parameter error ☆ 1 time ☆ 2 times Zero-crossing signal error ☆ 3 times Indoor fan speed has been out of control ☆...

  • Page 51: Diagnosis And Solution

    DM12-01.01.09en Oasis On-off 11.2 Diagnosis and Solution 11.2.1 EEPROM parameter error diagnosis and solution Shut off the power supply and turn on it 5s later The problem comes out again Is the EEPROM chip plugged in PCB well? Correct the connection Replace the main PCB Service manual...
  • Page 52 Oasis On-off DM12-01.01.09en 11.2.2 Zero crossing detection error This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the main control board must have fault. 11.2.3 Indoor fan speed has been out of control diagnosis Shut off the power supply and turn on it 5s later The unit does not...
  • Page 53 DM12-01.01.09en Oasis On-off 11.2.4 Open or short circuit of temperature sensors diagnosis and solution Check the connections between the sensors and the PCB. Are the connections good? Replace the sensor and check if Replace the indoor PCB the errors happen again? Service manual...
  • Page 54 Oasis On-off DM12-01.01.09en 11.2.5 Refrigerant Leakage Detection Shut off the power supply and turn on it 5s later The problem comes out again Replace the T2 sensor Is there cool air blowing out from the indoor unit air and check if the errors outlet? happen again? Is there any leakage? Especially the connection...
  • Page 55 DM12-01.01.09en Oasis On-off 11.2.6 Indoor / outdoor units communication error Power off, then power on the A/C by the breaker. (reconnect the power wire). Is the E1 extinguished? Check the wiring on the outdoor terminal and indoor terminal follow the wiring diagram. Is all the connecting correctly? -24V<Vs<+24V? (Vs is the voltage between S and N).

This manual is also suitable for:

Mo11m-09hn1Ms11m-12hrn1Mo11m-12hn1Ms11m-18hrn1Mo11m-18hn1Ms11m-24hrn1 ... Show all

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