SERVICE MANUAL
Contents
1. Amendatory capacity demand 0 1 2 We ue 11 212 6 4 3 2 Indoor fan running rules Indoor fan speed can be set as high medium low or auto fan and the anti cold wind function is preferential Auto fan action in heating mode Ti Ts i 4 Low 2 5 2 ie e Medium 1 5 E High Y 6 4 3 3 Outdoor fan running rules Low 14 12 High 6 4 3 3 High evaporator coil temp T2 protection If T2 gt 63 C the indoor unit has no capacity demand and resume till 48 C 6 4 3 4 Defrosting mode Condition of defrosting T3 TCDIN and lasts for 40 minutes TCDIN 2 C Defrosting action HEAT_F2 a COOL F9 Compressor p RN tos 30S 308 408 4 Way valve Outdoor fan Indoor fan 10S Condition of ending defrosting If any one of following items is satisfied defrosting will stop and the machine will turn to normal heating mode D T3 TCDE TCDE 15C 2 The defrosting time achieves 10min 6 4 4 Auto mode This mode can be chosen with remote controller and the setting temperature can be changed between 17 30 C In auto mode the machine will choose cooling heating or fan only mode according to AT AT T1 Ts AT T1 Ts Running mode Cooling 1SATS1 C Fan only Heating Indoor fan will run at auto fan of the relevant mode The louver operate same as in relevant mode If the machine switches mode between hea2. optimum performance will be achieved during this operating temperature zone 6 Electronic function 6 1 Abbreviation T1 Indoor ambient temperature T2 Coil temperature of indoor heat exchanger middle T2B Coil temperature of indoor heat exchanger outlet T3 Coil temperature of outdoor heat exchanger T4 Outdoor ambient temperature T5 Compressor discharge temperature Ts Setting temp 6 3 Main Protection 6 3 1 Three minutes delay at restart for compressor 6 3 2 Indoor fan delayed open function When system starts up the louver will be active immediately and the indoor fan will open after 10s If the system runs at heating mode the indoor fan will be also controlled by anti cold wind function 6 3 3 Sensor protection at open circuit and breaking disconnection 6 3 4 Fan speed is out of control When Indoor fan speed is too low lower than 300RPM lasting 50 seconds the unit stops and LED displays failure information and can t returns to normal operation automatically 6 3 5 Zero crossing detection error protection If AC can not 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 The correct zero crossing signal time interval should be between 6 13ms 6 4 Operation Modes and Functions 6 4 1 Fan mode 1 The outdoor fan and compressor stop 2 Temperature setting function is disabled and no setting te
3. 998 CN25 CNS N INDOOR PCB CN10 ROOM TEMP SENSOR YELLOW CN16 S AE CN3 CN39 CN43 CN44 DISPLAY BOARD L L OP LN SQ OUTDOOR UNIT TRANSFORMER MSRI 12HRDN1 MSRI 18HRDN1 202052090129 ROOM TEMP SENSOR RED mr CN YELLOW ii n INDOOR PCB PIPE TEMP SENSOR 1 CHOOSE ONE BY THE DD TRANSFORMER i CN10 CN13 P 1 L CNI7 _ O DISPLAY BOARD OUTDOOR UNIT This symbol indicates the element is optional the actual shape shall be prevail 5 Operation characteristics Temperature P Cooling operation Heating operation Drying operation Mode Room temperature 217 C s30 C 217 C Outdoor temperature 0 C 50 C 15 C 24 C 0 C 50 C 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 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set HIGH fan mode 3 The
4. RMI 1103 A SERVICE MANUAL MIDEA AIRCONDITIONER EUROPE MARKET DC INVERTER MULTI TYPE R DC INVERTER MULTI SERIES 2 Function 2 1 Model Names of Indoor units Capacity Indoor units DC 7k MDSRI 07HRDN1 Inverter Multi 9k MDSRI 09HRDN1 Series 12k MDSRI 12HRDN1 18k MDSRI 18HRDN1 2 2 Product features Operation by remote controller Sensing by temperature sensor Room temperature control Maintain the room temperature in accordance with the setting temperature Anti freezing control in cooling lonizer optional Time Delay Safety control Golden fin optional Indoor fan speed control high med low breeze auto Tele Remote control Two direction air vane Optional The unit will decide the louver direction according to operation mode Sleep mode auto control Self diag function Anti cold function Independent dehumidification Prevent the cold wind at the beginning of unit start The function is usually used in rainy days in springtime or damp areas Auto defrost Air flow Direction The louver can be set at the desired position or swing up and down automatically Aut tart f ti uto restart function Auto mode Temp Compensation Flexible wiring connection 3 Dimension WW MDSRI 07 HRDN1 MDSRI 09HRDN1 MDSRI 12HRDN1 MDSRI 18HRDN1 Position of installation board 4 Wiring Diagram MDSRI 07HRDN1 MDSRI O9HRDN1 202032390
5. ced cooling unit Other indoor units will run at forced cooling mode too and they will be the slave forced cooling units The slave forced cooling units can not quit forced cooling mode until the master forced cooling unit quit and turn to cooling mode at low speed with 24 C setting temperature 6 4 6 5 The slave forced cooling units will not be controlled by other signals except timer off signal For model MSR11 07HRDN1 Q amp MSR11 09HRDN1 Q the slave forced cooling units will not be controlled by other signals 6 4 6 6 If AC is running in sleep mode and receives forced operation signal it will quit the sleep mode 6 4 7 Timer function 6 4 7 1 Timing range is 24 hours 6 4 7 2 Timer on The machine will turn on automatically when reaching the setting time 6 4 7 3 Timer off The machine will turn off automatically when reaching the setting time 6 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 6 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 time 6 4 7 6 The timer function will not change the AC current operation mode Suppose AC is off now it will not start up firstly after setting the timer off function And when reaching the setting time the timer LED will be off and the AC running mode has not been chan
6. ged 6 4 7 7 The setting time is relative time 6 4 8 Sleep function mode 6 4 8 1 Operation time in sleep mode is 7 hours After 7 hours the AC quits this mode and turns off 6 4 8 2 Operation process in sleep mode is as follow When cooling the setting temperature rises 1 C be lower than 30 C every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed When heating the setting temperature decreases 1 C be higher than 17 C every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed Anti cold wind function has the priority 6 4 8 3 Timer off and remote controller off signals have the priority compared with sleep function 6 4 8 4 When user uses timer off function in sleep mode or sleep function in timer off mode if the 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 6 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 sudden power failure the module memorizes the setting conditions before the power failure The unit will resume the previous operation setting not including Swing function automatically after 3 minutes when power returns If the memorization condition is forced cooling mode the unit wil
7. l run in cooling mode for 30 minutes and turn to auto mode as 24 C setting temp 6 4 11 Mode conflict The indoor units can not work cooling mode and heating at same time Heating mode has a priority 6 4 11 1 Definition Cooling mode Heating Mode Fan Off Cooling mode No Yes No No Heating Mode Yes No Yes No Fan No Yes No No Off No No No No No No mode conflict Yes Mode conflict 6 4 11 2 Unit action e Suppose Indoor unit A working in cooling mode or fan mode and indoor unit B is set to heating mode then A will change to off and B will work in heating mode e Suppose Indoor unit A working in heating mode and indoor unit B is set to cooling mode or fan mode then B will change to stand by and A will be no change
8. mperature 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 The action of auto fan in fan only mode is the same as auto fan in cooling mode with 24 C setting temperature T1 l A 27 5 3 High 7 Medium 255 F 7 25 Y Low 6 4 2 Cooling Mode 6 4 2 1 Compressor running rules The compressor will run at corresponding frequency according to the gross amendatory capacity demand Frequency Hz 0 COOL F1 COOLF2 COOL F11 COOL F12 Amendatory capacity demand 0 1 2 l e 11 212 Meanwhile the maximum running frequency will be adjusted according to the outdoor ambient temp T 43 41 COOL F4 42 COOL F5 39 COOL F6 No limit 6 4 2 2 Indoor fan running rules In cooling mode indoor fan runs all the time and the speed can be selected as high medium low and auto Auto fan in cooling mode acts as follow Ti Ts 3 5 High Medium Y Low 6 4 2 3 Evaporator low temperature T2 protection When T2 lt 4 C the indoor has no capacity demand and resume till T2 gt 8 C 6 4 2 4 Outdoor fan running rules 6 4 3 Heating Mode T4 4 22 20 6 4 3 1 Compressor running rules High The compressor will run at corresponding frequency according to the gross amendatory capacity demand Frequency Hz 0 HEAT F1 HEAT F2 HEAT F11 HEAT F12
9. ting and cooling the compressor will keep stopping for 15 minutes and then rechoose mode according to T1 Ts If the setting temperature is modified the machine will rechoose running function 6 4 5 Drying mode 6 4 5 1 Indoor fan speed is fixed at breeze and can t be changed The louver angle is the same as in cooling mode 6 4 5 2 Overlow room temperature protection In drying mode if room temperature is lower than 10 C the indoor fan will stop and not resume until room temperature exceeds 12 C 6 4 5 3 Evaporator anti freezing protection are active 6 4 6 Forced operation function 6 4 6 1 Enter forced operation function Press the touch button continually the AC will run as below sequence di auto Forced cooling Off When the machine is off pressing the touch button will carry the machine to forced auto mode after this if pressing the button once again the machine will turn into forced cooling mode In forced cooling mode pressing touch button will turn off the machine 6 4 6 2 In forced operation mode all general protections and remote control are available 6 4 6 3 Operation rules Forced cooling mode The indoor fan runs as breeze After running for 30 minutes AC will turn to auto mode with 24 C setting temperature Forced auto mode The action of forced auto mode is the same as normal auto mode with 24 C setting temperature 6 4 6 4 When there s indoor unit running in forced cooling it is the master for
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