Midea MSG-07CRN2 Service Manual Download Page 45

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Service manual

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12. Troubleshooting

12.1 Display board

Operation

The indicator flashes once every second after power is on and illuminates when the air conditioner is
in operation.

Timer indicator:

The indicator illuminates then TIMER is set ON.

PRE-DEF. indicator (For cooling & heating mode only)

The air conditioner starts defrosting automatically if outdoor unit frosts in heating operating.
At this time, PRE-DEF. indicator illuminates.

Auto indicator:

This indicator flashes when the air conditioner is in AUTO operation.

ECON indicator

This indicator illuminates while the air conditioner is in economic operation.

Summary of Contents for MSG-07CRN2

Page 1: ...MSG 07CRN2 MSG 07HRN2 MSG 09CRN2 MSG 09HRN2 MSG 12CRN2 MSG 12HRN2 MSG 16CRN2 MSG 16HRN2 MSG 18CRN2 MSG 18HRN2 MSG 21CRN2 MSG 21HRN2...

Page 2: ......

Page 3: ...allation 19 8 2 Connecting the cables 19 8 3 Pipe length and the elevation 19 8 4 Air purging of the piping and indoor unit 20 8 5 Pumping down Re installation 21 8 6 Re air purging Re installation 22...

Page 4: ...estart function 39 10 14 Anion optional 39 11 Model and Parameters 40 12 Troubleshooting 41 12 1 Display board 41 12 2 Troubleshooting 42 12 3 Diagnostic chart 43 12 4 Resetting phenomenon often occur...

Page 5: ...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 Do not let the air...

Page 6: ...tional Do not expose the skin directly to cool air for long periods of time Do not sit in the draft This could harm to your health Do not use the product for special purposes such as preserving foods...

Page 7: ...each operation mode The unit will decide the louver direction according to operation mode Two direction air vane The fan is turn to low speed cooling heating The unit will be turn off after seven hour...

Page 8: ...or unit run more quietly Low noise air flow system The hydrophilic fin can improve the heating efficiency at operation mode Hydrophilic aluminum fin It is only operated in the heating operation mode e...

Page 9: ...Service manual 5 3 Dimension 3 1 Indoor unit Dimension Mode W H L 7K 750 250 188 9K 750 250 188 12K 750 250 188 16K 906 286 235 18K 906 286 235 21K 906 286 235...

Page 10: ...6 3 2 Outdoor unit Dimension Mode W H D L1 L2 L3 7K 700 535 235 458 280 540 9K 700 535 235 458 280 540 12K 780 540 250 530 315 590 16K 760 590 285 540 335 615 18K 760 590 285 540 335 615 21K 845 695 3...

Page 11: ...1020 960 900 1100 1020 950 m3 h 430 400 370 430 400 370 470 440 410 dB A 35 32 30 35 32 30 36 32 30 Model YDK24 6T YDK24 6T YDK24 6T Brand Welling Welling WELLING Input W 70 70 70 Capacitor uF 3 3 3...

Page 12: ...0 1050 1250 1150 1050 m3 h 470 440 410 500 450 400 500 450 400 dB A 36 32 30 40 36 34 40 36 34 Model YDK24 6T YDK25 6C YDK25 6C Brand Welling WELLING WELLING Input W 70 68 68 Capacitor uF 3 2 5 2 5 Sp...

Page 13: ...100 1000 m3 h 800 770 740 800 770 740 800 770 740 dB A 42 40 38 42 40 38 42 40 38 Model YDK36 6 YDK36 6 YDK36 6 Brand WELLING WELLING WELLING Input W 96 96 96 Capacitor uF 2 5 F 450V 2 5 F 450V 2 5 F...

Page 14: ...1000 m3 h 800 770 740 800 770 740 800 770 740 dB A 42 40 38 41 37 35 41 37 35 Model YDK36 6 YDK53 6KB YDK53 6KB Brand WELLING WELLING WELLING Input W 96 150 150 Capacitor uF 2 5 F 450V 3 0 F 450V 3 0...

Page 15: ...Service manual 11 5 Refrigerant cycle diagram Cooling only Heat pump mode...

Page 16: ...t from the continuous operation under constant air temperature conditions However excludes the initial pull down stage 6 2 Heating operation Indoor air temp DB Outdoor unit air temp DB Note The chart...

Page 17: ...Service manual 13 7 Schematic diagram and Wiring diagram 7 1 Schematic diagram...

Page 18: ...e MSG 07CR MSG 09CR MSG 12CR 1 2 N COMPRESSOR CAPACITOR R E D O U T D O O R U N I T O V E R L O A D R E L A Y Y G C O M P R E S S O R S C B L U E R B L A C K R E D B L A C K INDOOR UNIT FAN CAPACITOR...

Page 19: ...1 2 N COMPRESSOR CAPACITOR R E D O U T D O O R U N I T O V E R L O A D R E L A Y Y G C O M P R E S S O R S C B L U E R B L A C K R E D B L A C K INDOOR UNIT FAN CAPACITOR R E D Y G F A N M O T O R Y...

Page 20: ...E TRANSFORMER DISPLAY BOARD SWITCH BOARD CN12 CN9 COMPRESSOR RELAY CURRENT DETECTOR WHITE CN1 CN4 BROWN BLUE CN14 CN2 1 2 N COMPRESSOR CAPACITOR R E D O U T D O O R U N I T O V E R L O A D R E L A Y Y...

Page 21: ...Service manual 17 7 2 2 MSG 07HR MSG 09HR MSG 12HR...

Page 22: ...Service manual 18 MSG 16HR MSG 18HR MSG 21HR...

Page 23: ...5 2 5 Grade 8 3 Pipe length and the elevation Standard length Max Max Additional m Elevation Elevation refrigerant Btu h GAS LIQUID B m A m g m 3 8 9 52 1 4 6 35 5 5 10 30 1 2 12 7 1 4 6 35 5 5 10 30...

Page 24: ...eck the flare connection for gas leakage 4 Purge the air from the system Set the 2 way valve to the open position and remove the cap from the 3 way valve s service port Using the hexagonal wrench to p...

Page 25: ...charge hose with the push pin to the gas service port 4 Air purging of the charge hose Open the low pressure valve on the charge set slightly to purge air from the charge hose 5 Set the 2 way valve to...

Page 26: ...1 minutes repeat 3 times After purging the air use a torque wrench to tighten the flare nut to on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the r...

Page 27: ...he service port 3 Open the valves Low side on the charge set and discharge the refrigerant until the gauge indicates 0 05 to 0 1 Mpa If there is no air in the refrigeration cycle the pressure when the...

Page 28: ...has moved toward 0 1 Mpa 76 cmHg vacuum of 4 mmHg or less 3 Close the valve Low side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes...

Page 29: ...e specified amount of refrigerant if can be charged with a little at a time approximately 150g each time0 while operating the air conditioner in the cooling cycle however one time is not sufficient wa...

Page 30: ...1 85 1 71 1 58 1 47 1 37 15 C W Sensitive capacity kW 1 44 1 38 1 29 1 20 1 13 1 05 Input kW 0 67 0 70 0 73 0 79 0 88 0 91 24 C D Total capacity kW 2 13 2 04 1 90 1 80 1 68 1 55 17 C W Sensitive capac...

Page 31: ...2 00 1 87 1 73 15 C W Sensitive capacity kW 1 82 1 75 1 64 1 52 1 43 1 34 Input kW 0 86 0 90 0 94 1 02 1 13 1 17 24 C D Total capacity kW 2 71 2 58 2 42 2 28 2 13 1 96 17 C W Sensitive capacity kW 1...

Page 32: ...2 69 2 52 2 33 15 C W Sensitive capacity kW 2 46 2 36 2 21 2 05 1 92 1 80 Input kW 1 14 1 20 1 25 1 35 1 50 1 55 24 C D Total capacity kW 3 64 3 48 3 25 3 07 2 86 2 64 17 C W Sensitive capacity kW 2...

Page 33: ...3 60 3 36 3 12 15 C W Sensitive capacity kW 3 28 3 15 2 95 2 74 2 57 2 40 Input kW 1 56 1 64 1 71 1 85 2 05 2 12 24 C D Total capacity kW 4 87 4 65 4 35 4 11 3 83 3 53 17 C W Sensitive capacity kW 3...

Page 34: ...6 3 83 3 58 3 32 15 C W Sensitive capacity kW 3 50 3 35 3 14 2 91 2 74 2 56 Input kW 1 62 1 71 1 78 1 92 2 13 2 20 24 C D Total capacity kW 5 18 4 95 4 63 4 37 4 08 3 76 17 C W Sensitive capacity kW 3...

Page 35: ...1 4 05 3 79 3 52 15 C W Sensitive capacity kW 3 70 3 55 3 33 3 08 2 89 2 71 Input kW 1 78 1 88 1 96 2 11 2 35 2 42 24 C D Total capacity kW 5 48 5 24 4 90 4 63 4 31 3 98 17 C W Sensitive capacity kW 4...

Page 36: ...IRESTORE Amp self protection return value THDEFROST High wind defrosting temperature difference TMDEFROST Middle wind defrosting temperature difference TLDEFROST Low wind defrosting temperature differ...

Page 37: ...ss Zero signal error warning If there is no Cross Zero signals in 4 minutes the unit stops and LED displays failure information and can t returns to normal operation automatically 10 4 5 The current p...

Page 38: ...ing mode T evaporator temp TE5 T EVAP temp up EVAP temp down TE6 Compressor and outdoor fan on Compressor and outdoor fan off after 5 mins 10 7 Dehumidifying mode 10 7 1 The 4 way valve is off in dehu...

Page 39: ...1 Generally the 4 way valve is open in heating mode but it is closed in defrosting mode 4 way valve must delay 2 minutes compared with compressor if the compressor changed into non heating mode or tu...

Page 40: ...The louver opens to Standard Angle ANGLHEAT when power is on for the first time 10 9 Defrosting mode available for heating mode Defrosting condition Defrosting starts when either of the following A a...

Page 41: ...frost the fourth defrost time should be 10 minutes The circulation is as following Ending condition of defrosting If one of following conditions is satisfied end the defrost and turn into heating mode...

Page 42: ...ose fan mode is set as low the A C operates at the DRY mode with a set temp of 24 10 11 3 All protections of remote control cooling are available at forced cooling operation 10 11 4 Forced Auto functi...

Page 43: ...an only mode the condition will be the same after the air conditioner running under economic mode after 2 hours and during the next time the set temp do not change The total time is 7 hours after 7 ho...

Page 44: ...00 200 ANGLHEAT 0 0 0 ANGLOFF 124 124 124 124 124 124 THDEFROST 16 C 14 C 14 C TMDEFROST 17 C 15 C 15 C TLDEFROST 18 C 16 C 16 C Model MSG 16CR MSG 16HR MSG 18CR MSG 18HR MSG 21CR MSG 21HR I3SEC A 16...

Page 45: ...icator illuminates then TIMER is set ON PRE DEF indicator For cooling heating mode only The air conditioner starts defrosting automatically if outdoor unit frosts in heating operating At this time PRE...

Page 46: ...or occurs 4 times X EEROM error On No over zero signal r Extinguish Flash at 5Hz For heat pump mode Failure phenomenon Operation lamp Timer lamp Defrosting lamp Over current protection of the compress...

Page 47: ...Service manual 43 12 3 Diagnostic chart After energizing no indicator is lighted and the air conditioner can t be operated...

Page 48: ...That is automatically entering to the status when power is on The reason is that the instantaneous voltage of main chip is less than 4 5V Check according to the following procedure 12 5 Operation lamp...

Page 49: ...12 8 Operation lamp on and Timer lamp flashes EEROM error indoor PCB is defective 12 9 Operation lamp flashes Timer lamp flashes This is alarm signal when the main chip can t detect over zero signal...

Page 50: ...25 10 52 3 1918 1 37 1988 26 9 5507 53 3 0707 0 35 2024 27 9 1245 54 2 959 1 33 3269 28 8 7198 55 2 8442 2 31 5635 29 8 3357 56 2 7382 3 29 9058 30 7 9708 57 2 6368 4 28 3459 31 7 6241 58 2 5397 5 26...

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