Midea Neola On-off MS11D-07HRN1 Service Manual

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DM12-01.01.07en

Neola On-off SERIES

Service Manual 2012

MS11D-07HRN1 / MO11D-07HN1

MS11D-09HRN1 / MO11D-09HN1

MS11D-12HRN1 / MO11D-12HN1

MS11D-18HRN1 / MO11D-18HN1

MS11D-21HRN1 / MO11D-21HN1

MS11D-24HRN1 / MO11D-24HN1

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Summary of Contents for Midea Neola On-off MS11D-07HRN1

Page 1 DM12-01.01.07en Neola On-off SERIES Service Manual 2012 MS11D-07HRN1 / MO11D-07HN1 MS11D-09HRN1 / MO11D-09HN1 MS11D-12HRN1 / MO11D-12HN1 MS11D-18HRN1 / MO11D-18HN1 MS11D-21HRN1 / MO11D-21HN1 MS11D-24HRN1 / MO11D-24HN1...
Page 2 Neola On-off DM12-01.01.07en CONTENTS 1. Precaution .............................. 3 1.1 Safety Precaution .......................... 3 1.2 Warning ............................3 2. Function ..............................8 3. Specification ............................11 4. Dimension .............................15 4.1 Indoor Units ..........................15 4.2 Outdoor Units ..........................18 5. Capacity tables ............................19 6.
Page 3 DM12-01.01.07en Neola 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 unit, be sure to read this service manual at first. 1.2 Warning Ø...
Page 4 Neola On-off DM12-01.01.07en 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. Be sure the installation area does not deteriorate with age.
Page 5 DM12-01.01.07en Neola On-off 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 Neola On-off DM12-01.01.07en 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. Use two or more people to lift and transport the product. Avoid personal injury.
Page 7 DM12-01.01.07en Neola On-off 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. Use a firm stool or ladder when cleaning or maintaining the product. Be careful and avoid personal injury.
Page 8 Neola On-off DM12-01.01.07en 2. Function Model Names of Indoor/Outdoor Units Series Capacity Indoor units MS11D-07HRN1 7K Btu MO11D-07HN1 MS11D-09HRN1 9K Btu MO11D-09HN1 MS11D-12HRN1 12K Btu MO11D-12HN1 On-Off MS11D-18HRN1 18K Btu MO11D-18HN1 MS11D-21HRN1 21K Btu MO11D-21HN1 MS11D-24HRN1 24K Btu MO11D-24HN1 The designs, and information in this book are subject to change without notice for product improvement. Service manual...
Page 9 DM12-01.01.07en Neola On-off Indoor units Operation by remote controller Sensing by room temperature Room temperature sensor. Pipe temperature sensor. Room temperature control Maintain the room temperature in accordance with the setting temperature. Anti-freezing control in cooling Prevent the water being frozen on evaporator by sensing the evaporator pipe temperature in cooling mode Time Delay Safety control Indoor fan speed control...
Page 10 Neola On-off DM12-01.01.07en Outdoor units Power relay control Low noise air flow system Anti-rust cabinet Made from electrolytic zinc steel sheet and anti-rust coated components. Valve protection cover It protects the valves and prevents water from dripping. Service manual...
Page 11 DM12-01.01.07en Neola On-off 3. Specification Indoor model name MS11D-07HRN1 MS11D-09HRN1 MS11D-12HRN1 Outdoor model name MO11D-07HN1 MO11D-09HN1 MO11D-12HN1 Power supply Ph-V-Hz 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph Cooling Capacity Btu/h 7000 9000 12000 2,05 2,64 3,52 Input 1005 1347 Rated current 2.61...
Page 12 Neola On-off DM12-01.01.07en Indoor noise level (Hi/Mi/Lo) dB(A) 40/34/29 40/37/30 40/35/30 Indoor unit Dimension(W*D*H) 680x255x178 680x255x178 770x255x188 Packing (W*D*H) 745x255x330 745x255x330 835x265x330 Net/Gross weight 7 / 8.5 7 / 8.5 7.5/9.0 Outdoor fan motor Model YDK25-4(B) YDK25-4(B) YDK24-6(B) Brand Welling Welling Welling Input...
Page 13 DM12-01.01.07en Neola On-off Indoor model name MS11D-18HRN1 MS11D-21HRN1 MS11D-24HRN1 Outdoor model name MO11D-18HN1 MO11D-21HN1 MO11D-24HN1 Power supply Ph-V-Hz 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph Cooling Capacity Btu/h 18000 21000 24000 5,28 6,15 7,03 Input 2020 2358 2695 Rated current 10.6 2.61...
Page 14 Neola On-off DM12-01.01.07en Indoor noise level (Hi/Mi/Lo) dB(A) 44/40/35 48/44/38 48/45/39 Indoor unit Dimension(W*D*H) 905x275x198 1030x315x218 1030x315x218 Packing (W*D*H) 970x270x345 1115x395x300 1115x395x300 Net/Gross weight 9.8/11.7 12 / 15 12 / 15 Outdoor Model YDK24-6(B) YDK48-6H(A) YDK100-6D(B) motor Brand Welling Welling Welling Input 77.3...
Page 15 DM12-01.01.07en Neola On-off 4. Dimension 4.1 Indoor Units Model MS11D-07HRN1 MS11D-09HRN1 MS11D-12HRN1 MS11D-18HRN1 MS11D-21HRN1 1030 MS11D-24HRN1 1030 Service manual...
Page 16 Neola On-off DM12-01.01.07en 7k, 9k Service manual...
Page 17 DM12-01.01.07en Neola On-off 511.2 21K, 24K Service manual...
Page 18 Neola On-off DM12-01.01.07en 4.2 Outdoor Units More than 30cm More than 60cm (Service space) More than 30cm More than 60cm More than 70cm Model MO11D-07HN1 MO11D-09HN1 MO11D-12HN1 MO11D-18HN1 MO11D-21HN1 MO11D-24HN1 Service manual...
Page 19 DM12-01.01.07en Neola On-off 5. Capacity tables MS11D-07HRN1 / MO11D-07HN1 Cooling Cooling Outdoor conditions (DB) Indoor Conditions (kW) 18ºC 21ºC 28ºC 35ºC 43ºC 2.21 2.11 2.01 1.91 1.82 21/15ºC DB/WB 1.59 1.56 1.55 1.53 1.53 Input 2.09 2.17 2.35 2.45 2.53 2.26 2.17 2.07...
Page 20 Neola On-off DM12-01.01.07en MS11D-09HRN1 / MO11D-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 2.10 2.17 2.36 2.46 2.54 2.90 2.80 2.67 2.53 2.38 24/17ºC DB/WB...
Page 21 DM12-01.01.07en Neola On-off MS11D-12HRN1 / MO11D-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 2.09 2.17 2.35 2.45 2.53 3.87 3.73 3.56 3.38 3.17 24/17ºC DB/WB...
Page 22 Neola On-off DM12-01.01.07en MS11D-18HRN1 / MO11D-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 2.09 2.17 2.35 2.45 2.53 5.81 5.60 5.33 5.07 4.75 24/17ºC DB/WB...
Page 23 DM12-01.01.07en Neola On-off MS11D-21HRN1 / MO11D-21HN1 Cooling Cooling Outdoor conditions (DB) Indoor Conditions (kW) 18ºC 21ºC 28ºC 35ºC 43ºC 6.64 6.33 6.03 5.72 5.47 21/15ºC DB/WB 4.78 4.69 4.64 4.58 4.60 Input 2.09 2.17 2.35 2.45 2.53 6.77 6.52 6.21 5.90 5.54 24/17ºC DB/WB...
Page 24 Neola On-off DM12-01.01.07en MS11D-24HRN1 / MO11D-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 2.09 2.17 2.35 2.45 2.53 7.73 7.45 7.10 6.75 6.33 24/17ºC DB/WB...
Page 25 DM12-01.01.07en Neola On-off 6. Refrigerant Cycle Diagram Heating pump mode Service manual...
Page 26 Neola On-off DM12-01.01.07en 7. Wiring Diagram 7.1 Indoor Units MS11D-07HRN1, MS11D-09HRN1, MS11D-12HRN1, MS11D-18HRN1 Service manual...
Page 27 DM12-01.01.07en Neola On-off MS11D-21HRN1, MS11D-24HRN1 Service manual...
Page 28 Neola On-off DM12-01.01.07en 7.2 Outdoor Units MO11D-07HN1, MO11D-09HN1, MO11D-12HN1, MO11D-18HN1 Service manual...
Page 29 DM12-01.01.07en Neola On-off MO11D-21HN1, MO11D-24HN1 Service manual...
Page 30 Neola On-off DM12-01.01.07en 8. Installation details 8.1 Wrench torque sheet for installation Additional Outside diameter Torque tightening torque inch N.cm N.cm 1500 1600 Æ6.35 (153kgf.cm) (163kgf.cm) 2500 2600 Æ9.52 (255kgf.cm) (265kgf.cm) 3500 3600 Æ12.7 (357kgf.cm) (367kgf.cm) 8.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet.
Page 31 DM12-01.01.07en Neola On-off 8.3 Pipe length and the elevation The pipe length and refrigerant amount: Additional amount of Capacity Connective pipe length Air purging refrigerant Less than 5m Use vacuum pump ------------------ 7k,9k,12k,18k More than 5m Use vacuum pump (Pipe length – 5) × 30g/m 21K, 24K More than 5m Use vacuum pump...
Page 32 Neola On-off DM12-01.01.07en 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 and outdoor units must be leak tested and evacuated to remove gas and moisture from the system.
Page 33 DM12-01.01.07en Neola On-off 7. Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7seconds after the gas coming out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure.
Page 34 Neola On-off DM12-01.01.07en 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 35 DM12-01.01.07en Neola On-off Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage. 8.5 Adding the refrigerant after running the system for many years Electronic scale Procedure: 1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve. Connect the charge hose to the valve at the bottom of the cylinder.
Page 36 Neola On-off DM12-01.01.07en Be sure to check for gas leakage. 8.6 Re-installation while the indoor unit need to be repaired 1. Collecting the refrigerant into the outdoor unit Procedure 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.
Page 37 DM12-01.01.07en Neola On-off Be sure to check for gas leakage. 2. Air purging by the refrigerant 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.
Page 38 Neola On-off DM12-01.01.07en 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 39 DM12-01.01.07en Neola 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 40 Neola On-off DM12-01.01.07en 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 41 DM12-01.01.07en Neola On-off 9. Operation characteristics Temperature Heating Cooling operation Drying operation Mode operation (<21000Btu/h models) Room temperature ( 21000Btu/h models) (<21000Btu/h models) Outdoor temperature ( 21000Btu/h models) 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 42 Neola On-off DM12-01.01.07en 10. Electronic function 10.1 Abbreviation T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger 10.2 Display function 10.2.1 Icon explanation on indoor display board. One of the following figures matches its display board . Run indicator Flash at 0.5Hz when the unit is standby.
Page 43 DM12-01.01.07en Neola On-off 10.3 Main Protection 10.3.1 Time Delay at restart for compressor. 10.3.2 Sensor protection at open circuit and breaking disconnection. 10.3.3 Zero crossing detection error protection If AC cannot detect zero crossing signal for 4 minutes or the zero crossing signal time interval is not correct, the unit will stop and the LED will display the failure.
Page 44 Neola On-off DM12-01.01.07en Tm=Ts, Tn=Ts-2. 10.4.2.2 Outdoor fan running rules: The On-off outdoor units have single fan speed. The outdoor fan will run following the compressor except when AC is in evaporator high temp. protection in heating mode, condenser high temp. protection in cooling mode, defrosting mode and the current protection.
Page 45 DM12-01.01.07en Neola On-off 10.4.3 Heating Mode (For Heating & Cooling model) 10.4.3.1 Compressor running rules: When indoor room temp.T1 is higher than Tj, the compressor and outdoor fan will shut off. When T1 is lower than Tk, the compressor and outdoor fan will start up. While Tj=Ts+4;T =Ts+2 for 7k,9k,12k,18k model and Tj=Ts;T =Ts-2 for 24K,28K model...
Page 46 Neola On-off DM12-01.01.07en Auto fan action: When T1-Ts>2 , the indoor fan will run at low speed. When T1-Ts≤0 , the indoor fan will run at medium speed. 10.4.3.4 Defrosting mode Condition of defrosting: 1 AC will enter defrosting mode if all of the following items is satisfied. 1.1 After the compressor keeps running 8 minutes, T=T2-T1 max-...
Page 47 DM12-01.01.07en Neola On-off High speed Medium speed Low speed About the setting defrosting time: condition runtime minute Defrosting time minute Case 1 A B1 Runtime=45 Case 2 A B1 45 runtime≤60 Case 3 A B1 60 runtime≤90 Case 4 A B1 90 runtime≤120 Case 5 A B1...
Page 48 Neola On-off DM12-01.01.07en Defrosting action DF=25SEC for 7k,9k,12k and DF=45SEC for 24K,28K 10.4.3.5 High evaporator coil temp.T2 protection: Model 10.4.4 Auto-mode The machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts). ΔT=T1-Ts Running mode ΔT 2 Cooling Fan-only -3≤ΔT≤2...
Page 49 DM12-01.01.07en Neola On-off After setting the mode, AC will run in auto mode if the compressor keeps not running for 15 minutes. 10.4.5 Drying mode 10.4.5.1 The compressor is cycled running by 10 minutes on and then 5 minutes off. The indoor fan will keep running at low speed.
Page 50 Neola On-off DM12-01.01.07en 10.4.8 Sleep function mode 10.4.8.1 Operation time in sleep mode is 7 hours. After 7 hours, the AC quits this mode and turns off. 10.4.8.2. Operation process in sleep mode is as follow: After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode. When cooling, the setting temperature rises 1 ºС...
Page 51 DM12-01.01.07en Neola On-off 11. Troubleshooting 11.1 Indoor unit error display For 7k, 9k, 12k, 18k Display Operation lamp flash times Timer lamp Failure EEPROM error Zero crossing detection error Indoor fan speed has been out of control Default Indoor room temperature sensor T1 open circuit Evaporator coil temperature sensor T2 open Condenser coil temperature sensor T3 open Refrigerant leak detection error...
Page 52 Neola On-off DM12-01.01.07en 11.2 Diagnosis and Solution 11.2.1 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 Disassemble the connection between fan.Does it rotate freely? fan and motor, check if the bearing is normal.
Page 53 DM12-01.01.07en Neola On-off 11.2.2 Open or short circuit of temperature sensor diagnosis and solution. Check the connections between the sensors and the PCB. Are the connections good? Replace the sensor and check if Replace outdoor PCB the errors happen again? 11.2.3 Over current protection occurs 4 times.
Page 54 Neola On-off DM12-01.01.07en 11.2.4 EEPROM parameter error diagnosis and solution Shut off the power supply and turn on it 5s later Replace indoor PCB The problem comes out again Correct the connection Is the EEPROM chip plugged in indoor PCB well? Replace the main PCB of indoor unit 11.2.5 Zero crossing detection error When such failure occurs, the main control board must have fault.
Page 55 DM12-01.01.07en Neola On-off 11.2.6 Indoor / outdoor units communication error Turn off the power supply, after 1 minute, connect the power supply, turn on the unit with remote controller The unit does not work normally. Check the wiring between indoor and outdoor unit.
Page 56 Neola On-off DM12-01.01.07en 11.2.7 Outdoor units protection Outdoor units protection Check when the power is on Whether the outdoor unit is power on Replace the outdoor Measure whether the voltage of the communication line’s red and unit board black end between the indoor and outdoor unit is +5V Check the indoor unit main board Replace indoor PCB Service manual...

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