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Midea MS9A-09HRDN1-QC2, Service Manual

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Midea MS9A-09HRDN1-QC2 Service Manual Download Page 20

 

 

17

7.8  Evacuation 

 

Procedure: 

1. Connect the vacuum pump to the charge set’s centre hose. 

2. Evacuation for approximately one hour. 

Confirm that the gauge needle 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 after turning off the vacuum pump). 

4. Disconnect the charge hose from the vacuum pump. 

Vacuum pump oil, if the vacuum pump oil becomes dirty or depleted, replenish as needle. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for MS9A-09HRDN1-QC2

Page 1: ...SERVICE MANUAL MIDEA AIRCONDITIONER DC INVERTER SPLIT WALL MOUNTED TYPE MS9A 09HRDN1 QC2 MS9A 12HRDN1 QC2 V1 0 Oct 2009...

Page 2: ...lation 15 7 7 Balance refrigerant of the 2 way 3 way valves 16 7 8 Evacuation 20 7 9 Gas charging 21 8 Operation characteristics 19 8 1 MS9A 09HRDN1 QC2 19 8 2 MS9A 12HRDN1 QC2 20 9 Electronic functio...

Page 3: ...10 1 Indoor Unit Error Display 31 10 2 Diagnosis and Solution 32 10 3 Key parts checking 40...

Page 4: ...a defective installation stand It may cause injury accident or damage to the product Be sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall wi...

Page 5: ...directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation Operational Do not expose the skin d...

Page 6: ...3 your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked The chemical in batteries could cause burns or other health hazards...

Page 7: ...rding to operation mode Turbo high med low breeze Restarting is for approx 3 minutes Prevent the water being frozen on evaporator by sensing the evaporator pipe temperature in cooling mode Room temper...

Page 8: ...on mode Hydrophilic aluminum fin It is only operated in the heating operation mode except defrosting operation Anti rust cabinet Valve protection cover 4 way valve control Made from electrolytic zinc...

Page 9: ...6 3 Dimension 3 1 Indoor Unit Model W mm H mm D mm MS9A 09HRDN1 QC2 710 250 190 MS9A 12HRDN1 QC2 790 265 198...

Page 10: ...7 3 2 Outdoor Unit MOR 09 12HDN1 QC2...

Page 11: ...490 380 Indoor noise level Hi Mi Lo dB A 39 33 28 40 35 29 Dimension W H D mm 710 250 190 790 265 198 Packing W H D mm 770 318 265 875 335 265 Indoor unit Net Gross weight Kg 7 5 9 5 9 0 11 0 Model Y...

Page 12: ...9 5 Refrigerant cycle diagram...

Page 13: ...10 6 Wiring diagram 6 1 Indoor Unit MS9A 09 12HRDN1 QC2...

Page 14: ...11 6 2 Outdoor Unit MOR 09 12HDN1 QC2...

Page 15: ...ngth and the elevation Pipe size Capacity Btu h Gas Liquid Standard length m Max Elevation B m Max Length A m Additional refrigerant g m 9k 3 8 9 52 1 4 6 35 5 8 20 20 12k 3 8 9 52 1 4 6 35 5 8 20 20...

Page 16: ...e to the open position and remove the cap from the 3 way valve s service port Using the hexagonal wrench to press the valve core pin discharge for three seconds and then wait for one minute 5 Use torq...

Page 17: ...hose with the push pin to the gas service port 5 Air purging of the charge hose Open the low pressure valve on the charge set slightly to purge air from the charge hose 6 Set the 2 way valve to the cl...

Page 18: ...te 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 refrigera...

Page 19: ...ce port 3 Open the valves Low side on the charge set and discharge the refrigerant until the gauge indicates 0 05 to 0 1Mpa If there is no air in the refrigeration cycle the pressure when the air cond...

Page 20: ...ved 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 after...

Page 21: ...fied 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 wait appr...

Page 22: ...0 79 0 80 0 81 0 75 0 76 0 77 Cooling Power Input KW Remark Indoor room temperature 27 19 Outdoor temperature 35 Indoor fan speed High 15 Cooling Capacity KW Cooling Characteristics Outdoor Ambient T...

Page 23: ...h m 3 5 3 4 3 2 3 3 3 6 3 7 3 8 10 11 12 13 14 5 6 7 8 9 1 00 1 02 1 04 1 06 0 94 0 96 0 98 Heating Power Input KW Remark Indoor room temperature 20 Outdoor temperature 7 6 Indoor fan speed High 15 3...

Page 24: ...when TIMER is set ON OFF DEF Indicator This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode TEMPERATURE...

Page 25: ...stop and LED display error code and can t return to normal operation automatically 9 3 6 Cross Zero signal error warning If there are no Cross Zero signal or the alternation of Cross Zero signal is n...

Page 26: ...t frequency of compressor Zone C Descend the current frequency of compressor until F1 Zone D Compressor stops after running as the minimum frequency F1 for 60 minutes or T is less than 2 9 5 2 Indoor...

Page 27: ...operation rule 1 In cooling mode indoor fan runs all the time and the speed can be selected as high medium low and auto 2 Auto fan in cooling mode acts as follow 9 5 7 Condenser high temperature prot...

Page 28: ...is preferential Auto fan action in heating mode 9 7 3 After start the operation frequency of compressor submits to following rule When the machine runs if Th stays in a zone for 3 minutes action of f...

Page 29: ...utes Condition 2 If T4 0 The program judges according to the condition 1 if the two items are satisfied then judges if T2 has descended for more than 5 if it has the machine starts defrosting or conti...

Page 30: ...The machine will quit from the rating capacity test mode if running for 5 hours or changing fan speed or setting temperature 9 7 9 Turbo function in heating mode press the TURBO button on remote cont...

Page 31: ...able 9 9 4 In forced cooling mode the unit will run with fixed frequency F2 at low speed 30 minutes later the unit will turn to normal auto mode with setting temperature 24 9 9 5 In forced auto mode t...

Page 32: ...as low speed 3 When heating the setting temperature descends 1 be lower than 30 every one hour 2 hour later the descending stops and indoor fan is fixed as low speed and anti cold wind is available 9...

Page 33: ...apacitors in PCB and relative circuit in outdoor unit even shut down the power supply electricity power still are kept in capacitors do not forget to discharge the electricity power in capacitor Elect...

Page 34: ...Indoor fan speed out of control E5 Open or short circuit of outdoor ambient or condenser temperature sensor E6 Open or short circuit of indoor room or evaporator temperature sensor P0 Inverter module...

Page 35: ...ection of L N S and GND good Is the GND connection on outdoor PCB good NO NO Reconnect and retest again Is the LED4 red on outdoor PCB bright and LED1 yellow blinking Replace outdoor e box Yes Yes The...

Page 36: ...n Is the failure cleared NO YES Check the compressor NO Is the indoor temperature and evaporator sensor connector and connection good Repair the connector and reconnect Replace the sensor and check if...

Page 37: ...ce of inverter compressor is it right YES Replace inverter compressor Reconnect and retry NO NO Is the power supply good Be sure the power supply is normal when using the units NO YES Replace the outd...

Page 38: ...Model RPG20D Measure the resistance value of each winding by using the multi meter 10 3 4 Step Motor Model MP2835 Measure the resistance value of each winding by using the multi meter Position Resist...

Page 39: ...sor Measure the resistance value of each winding by using the multi meter Some frequently used R T data for T1 T2 T3 and T4 sensor Temperature 5 10 15 20 25 30 40 50 60 Resistance Value K 26 9 20 7 16...

Page 40: ...37...

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