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Midea MSR1-09HRN1-QC2, Service Manual, Page: 3 / 31

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Content 

3 
 
 

10.

 

Troubleshooting ............................................................................................................................... 24

 

10.1

 

Display board ..................................................................................................................................... 24

 

10.2

 

Troubleshooting ................................................................................................................................. 24

 

10.3

 

Diagnostic chart ................................................................................................................................. 25

 

10.4

 

Resetting phenomenon often occurs during operation. ..................................................................... 26

 

10.5

 

Operation lamp flashes and Timer lamp off. ...................................................................................... 26

 

10.6

 

Operation lamp flashes and Timer lamp on. ...................................................................................... 26

 

10.7

 

Operation lamp off and Timer lamp flashes ....................................................................................... 27

 

10.8

 

Operation lamp on and Timer lamp flashes ....................................................................................... 27

 

10.9

 

Operation lamp flashes, Timer lamp flashes . .................................................................................... 27

 

11.

 

Characteristic of temperature sensor ............................................................................................ 28

 

 

Summary of Contents for MSR1-09HRN1-QC2

Page 1: ...Cover MSR1 09HRN1 QC2 MSR1 12HRN1 QC2...

Page 2: ...Air purging of the piping and indoor unit 10 7 5 Pumping down Re installation 11 7 6 Re air purging Re installation 12 7 7 Balance refrigerant of the 2 way 3 way valves 13 7 8 Evacuation 14 7 9 Gas c...

Page 3: ...on often occurs during operation 26 10 5 Operation lamp flashes and Timer lamp off 26 10 6 Operation lamp flashes and Timer lamp on 26 10 7 Operation lamp off and Timer lamp flashes 27 10 8 Operation...

Page 4: ...t 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 ai...

Page 5: ...rational 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 food...

Page 6: ...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 at the seventh h...

Page 7: ...makes the outdoor 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...

Page 8: ...Service manual 5 3 Dimension 3 1 Indoor unit 3 2 Outdoor unit Dimension Mode W H D 9K 790 275 190 12K 790 275 190 Dimension Mode W H D L1 L2 L3 9K 700 535 235 458 250 550 12K 780 540 250 549 276 555...

Page 9: ...Service manual 6 4 Refrigerant cycle diagram Cooling only Heat pump mode...

Page 10: ...from the continuous operation under constant air temperature conditions However excludes the initial pull down stage 5 2 Heating operation Indoor air temp DB Outdoor unit air temp DB Note The chart i...

Page 11: ...Service manual 8 6 Wiring diagram MSR1 09HRN1 QC2 MSR1 12HRN1 QC2 Indoor Outdoor...

Page 12: ...llowing specifications sheet Grade Unit 7K 9K 12K mm2 1 0 1 0 1 5 7 3 Pipe length and the elevation Capacity Btu h Pipe size Standard length m Max Elevation B m Max Pipe length A m Additional refriger...

Page 13: ...Check the flare connection for gas leakage 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 14: ...e charge hose with the push pin to the gas service port Air purging of the charge hose Open the low pressure valve on the charge set slightly to purge air from the charge hose Set the 2 way valve to t...

Page 15: ...r 1 minutes repeat 3 times After purging the air use a torque wrench to tighten the flare nut to on the 2 way valve Check the gas leakage Check the flare connections for gas leakage Discharge the refr...

Page 16: ...e service port 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 ai...

Page 17: ...has moved toward 0 1 Mpa 76 cmHg vacuum of 4 mmHg or less 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 a...

Page 18: ...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 19: ...ature protection restoring temperature TE7 Evaporator high temperature protection compressor off temperature TE8 Evaporator high temperature protection fan off temperature TE9 Evaporator high temperat...

Page 20: ...5 second later Current down If compressor turns off for continuously 4 times due to current protection in 5 minutes from Compressor On the unit stops and LED displays failure information and can t ret...

Page 21: ...operation will be resumed when room temperature restores to over 13 8 6 4 At dehumidifying mode the anti freezing function of the indoor heat exchanger is the same as that of cooling mode 8 6 5 At deh...

Page 22: ...but Anti cold wind function prevails Anti cold wind control function at heating mode T indoor exchanger temp T T temp up T temp down TE2 Setting fan speed Fan off Breeze TE3 TE1 TE4 8 7 5 Auto wind at...

Page 23: ...ssor still running Add up to 90 minutes 8 8 2 Defrosting time At condition If item B is satisfied before item A it would be regarded as severe frosting and the defrosting time is 10 minutes If item B...

Page 24: ...temp or reselect when the set temp varies 8 10 Force cooling function 8 10 1 Select forced cooling function with the forced cooling button or the switch 8 10 2 The compressor is unconditionally turne...

Page 25: ...temp will be changeless if it is under fan 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 cha...

Page 26: ...1 QC2 I3SEC 10 0A 12 0A I5MIN 7 5A 8 5A IFAN 5 5A 7 5A IRESTORE 4 5A 6 5A IDEFROST 3 5A 5 0A TE1 28 34 TE2 32 37 TE3 30 33 TE4 26 22 TE5 4 4 TE6 10 10 TE7 60 63 TE8 53 53 TE9 50 52 ANGLCOOL 88 88 ANGL...

Page 27: ...sts 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...

Page 28: ...Service manual 25 10 3 Diagnostic chart After energizing no indicator is lighted and the air conditioner can t be operated...

Page 29: ...s that the instantaneous voltage of main chip is less than 4 5V Check according to the following procedure 10 5 Operation lamp flashes and Timer lamp off Is connector connection good Is voltage being...

Page 30: ...10 8 Operation lamp on and Timer lamp flashes EEROM error indoor PCB is defective 10 9 Operation lamp flashes Timer lamp flashes This is alarm signal when the main chip can t detect over zero signal...

Page 31: ...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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