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Midea MSC-21CRN1, Service Manual

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Midea MSC-21CRN1 Service Manual Download Page 20

Service manual 

16 

 

 

8.7 

Balance refrigerant of the 2-way, 3-way valves 

 

Procedure: 

1. Confirm that both the 2-way and 3-way valves are set to the open position. 

2. Connect the charge set to the 3-way valve’s service port. 

ƒ

  Leave the valve on the charge set closed. 

ƒ

  Connect the charge hose with the push pin to the 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. 

ƒ

  If there is no air in the refrigeration cycle [the pressure when the air conditioner is not running is higher 

than 0.1Mpa, discharge the refrigerant until the gauge indicates 0.05 to 0.1 Mpa. If this is the case, it will 
not be necessary to apply a evacuation. 

ƒ

  Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil sill be 

discharged. 

Summary of Contents for MSC-21CRN1

Page 1: ...Cover MSC 21CRN1 MSC 21HRN1 MSC 24CRN1 MSC 24HRN1 MSC 28CRN1 MSC 28HRN1 ...

Page 2: ...n details 12 8 1 Wrench torque sheet for installation 12 8 2 Connecting the cables 12 8 3 Pipe length and the elevation 12 8 4 Air purging of the piping and indoor unit 13 8 5 Pumping down Re installation 14 8 6 Re air purging Re installation 15 8 7 Balance refrigerant of the 2 way 3 way valves 16 8 8 Evacuation 17 8 9 Gas charging 18 9 Pressure table 19 9 1 MSC 21CRN1 19 9 2 MSC 21HRN1 19 9 3 MSC...

Page 3: ...ing mode 27 11 8 Defrosting mode available for heating mode 29 11 9 Auto mode 30 11 10 Force cooling function 30 11 11 Sleep mode 30 11 12 Auto restart function 31 11 13 Turbo mode 31 11 14 PLASMA optional 31 11 15 Anion optional 31 12 Model and Parameters 32 13 Troubleshooting 33 13 1 Display board 33 13 2 Troubleshooting 33 13 3 Detailed malfunction analyse 34 13 4 Malfunction Stat 36 14 Charact...

Page 4: ......

Page 5: ... 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 conditioner run for a long time when the humidity is very high and a door or a windows is left open Moisture may condense and wet or damage furniture Take care to ensure that power cable could not be pulled out or damaged during operation...

Page 6: ... 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 works of art etc It is a consumer air conditioner not a precision refrigerant system There is risk of damage or loss of property Do not block the inlet or outlet of air flow It may cause product failure Use a soft cloth to clean Do not us...

Page 7: ...tion mode Two direction air vane The fan is turn to low speed cooling heating The unit will be turn off at the seventh hour Sleep mode auto control The function is usually used in rainy days in springtime or damp areas Independent dehumidification Operation indication Lamps LED The louver can be set at the desired position or swing up and down automatically Air flow Direction control The unit can ...

Page 8: ...ting efficiency at operation mode Hydrophilic aluminum fin It is only operated in the heating operation mode except defrosting operation Discharge pipe temperature protect Anti rust cabinet Valve protection cover 4 way valve control Made from electrolytic zinc steel sheet and anti rust coated components It protects the valves and prevents water from dripping Soft starter kit The unit keep the star...

Page 9: ...ension 3 1 Indoor unit 3 2 Outdoor unit Dimension Mode W H D 21K 1080 330 225 24K 1080 330 225 28K 1080 330 225 Dimension Mode W H D L1 L2 L3 7K 845 695 335 560 360 560 9K 845 695 335 560 360 560 12K 845 695 335 560 360 560 ...

Page 10: ...Service manual 6 4 Refrigerant cycle diagram Cooling only Heat pump mode ...

Page 11: ...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 is the result from the continuous operation under constant air temperature conditions However excludes the initial pull down stage ...

Page 12: ...Service manual 8 6 Schematic diagram and Wiring diagram 7 1 Schematic diagram ...

Page 13: ...Service manual 9 ...

Page 14: ...Service manual 10 7 2 Wiring diagram 7 2 1 MSC 21CRN1 MSC 24CRN1 MSC 28CRN1 ...

Page 15: ...Service manual 11 7 2 2 MSC 21HRN1 MSC 24HRN1 MSC 28HRN1 ...

Page 16: ... following specifications sheet Grade Unit 21K 24K 28K mm2 2 5 2 5 2 5 8 3 Pipe length and the elevation Pipe size Capacity Btu h GAS LIQUID Standard length m Max ElevationB m Max Pipe lengthA m Additional refrigerant g m 21k 24K 5 8 φ 15 88 3 8 φ 9 52 5 10 20 65 28K 5 8 φ 15 88 3 8 φ 9 52 5 10 20 65 Caution Capacity is base on standard length and maximum allowance length is base of reliability Oi...

Page 17: ...heck 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 press the valve core pin discharge for three seconds and then wait for one minute 5 Use torque wrench to tighten the service port cap to a torque of 1 8 kg m 18n m 6 Set the 3 way valve to the opened ...

Page 18: ... 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 the close position 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1MPa 7 Immediately set the 3 way valve to the closed position Do this quickly so that the...

Page 19: ...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 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant until the gauge indicate 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3...

Page 20: ...the 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 air conditioner is not running is higher than 0 1Mpa discharge the refrigerant until the gauge indicates 0 05 to 0 1 Mpa If this is the case it will not be necessary to apply a evacuation Discharge ...

Page 21: ...e 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 ...

Page 22: ...he 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 wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the refrigerant to be...

Page 23: ... 10 0 10 6 11 0 11 4 Heating mode OUTDOOR CONDITIONS Indoor Conditions Pressure 12ºC D 11ºC W 7ºC D 6ºC W 0ºC D 1ºC W 4ºC D 6ºC W 7ºC D 9ºC W 15ºC D xºC W 15ºC Pressure kg cm2 28 2 27 1 21 5 20 7 20 3 18ºC Pressure kg cm2 30 8 28 4 24 7 22 9 22 2 20ºC Pressure kg cm2 31 4 30 1 25 4 24 8 23 3 22ºC Pressure kg cm2 33 5 31 3 26 4 25 4 23 9 9 3 MSC 24CRN1 Cooling mode Outdoor temperature Dry bulb temp...

Page 24: ... D19ºC W Pressure kg cm2 9 3 9 6 9 8 10 3 10 7 11 2 32ºC D23ºC W Pressure kg cm2 9 7 10 1 10 3 10 8 11 1 11 6 9 6 MSC 28HRN1 Cooling mode Outdoor temperature Dry bulb temp Indoor Conditions Pressure 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC 21ºC D15ºC W Pressure kg cm2 8 9 9 0 9 2 9 3 9 7 10 3 24ºC D17ºC W Pressure kg cm2 9 0 9 2 9 6 9 8 10 3 10 8 27ºC D19ºC W Pressure kg cm2 9 3 9 6 9 8 10 3 10 7 11 2 32ºC D...

Page 25: ... 5 73 5 58 5 43 4 94 4 81 4 59 Sensitive capacity kW 4 49 4 30 4 22 4 00 3 87 3 65 21ºC D 15ºC W Input kW 1 72 1 94 2 10 2 30 2 40 2 56 Total capacity kW 6 41 6 13 5 80 5 51 5 38 5 13 Sensitive capacity kW 5 11 4 84 4 77 4 48 4 29 4 08 24ºC D 17ºC W Input kW 1 72 1 94 2 10 2 30 2 40 2 56 Total capacity kW 6 76 6 48 6 13 5 90 5 63 5 47 Sensitive capacity kW 5 32 5 10 4 96 4 63 4 49 4 23 27ºC D 19ºC...

Page 26: ...7 6 21 5 64 5 49 5 24 Sensitive capacity kW 5 13 4 91 4 83 4 57 4 42 4 17 21ºC D 15ºC W Input kW 1 97 2 21 2 40 2 63 2 74 2 93 Total capacity kW 7 33 7 01 6 63 6 30 6 15 5 86 Sensitive capacity kW 5 84 5 53 5 45 5 11 4 91 4 67 24ºC D 17ºC W Input kW 1 97 2 21 2 40 2 63 2 74 2 93 Total capacity kW 7 73 7 40 7 03 6 74 6 43 6 25 Sensitive capacity kW 6 08 5 83 5 66 5 29 5 13 4 84 27ºC D 19ºC W Input ...

Page 27: ...4 7 25 6 58 6 41 6 12 Sensitive capacity kW 5 99 5 73 5 63 5 34 5 16 4 87 21ºC D 15ºC W Input kW 2 29 2 58 2 80 3 07 3 19 3 42 Total capacity kW 8 55 8 17 7 74 7 34 7 18 6 84 Sensitive capacity kW 6 81 6 45 6 36 5 97 5 72 5 45 24ºC D 17ºC W Input kW 2 29 2 58 2 80 3 07 3 19 3 42 Total capacity kW 9 01 8 63 8 20 7 87 7 50 7 29 Sensitive capacity kW 7 09 6 80 6 61 6 17 5 99 5 64 27ºC D 19ºC W Input ...

Page 28: ...perature protection restoring temperature TE7 Evaporator high temperature protection compressor off temperature TE8 Evaporator high temperature protection fan off temperature TE9 Evaporator high temperature protection restoring temperature TE10 Condenser high temperature protection compressor off temperature TE11 Condenser high temperature protection compressor restoring on temperature 11 2 Functi...

Page 29: ...of the protection occur the outdoor unit exports a signal to indoor unit The action of indoor unit when the indoor unit infers a high tension signal from outdoor exceeding 3 seconds the whole unit turns off come to checking condition the indoor unit shows the information of malfunction 4 way valve turns off 2 minutes after the compressor When the indoor unit infers a low tension signal from outdoo...

Page 30: ...Service manual 26 ...

Page 31: ...turbo mode The condition of this protection Under the protection the outdoor fan keeps run 11 6 Dehumidifying mode The 4 way valve is off in dehumidifying mode At dehumidifying mode the unit runs In cooling the speed of the indoor fan is low and the speed can t change At dehumidifying mode the protection is the same as that of cooling mode At dehumidifying mode the action of step motor is the same...

Page 32: ...e compressor must run for 4 minutes after starting and then judge temperature Meanwhile other protections are still valid Tc 1 T1 Ts Room temp up Room temp down Tc Compressor and outdoor fan off Compressor and outdoor fan on Ts Tc is the temperature of heating mode The temperature will increase 4 3 2 1 the unit choose one with the jump JT1 JT2 JT1 JT2 OFF ON OFF 1 3 ON 2 4 11 7 4 Indoor Fan action...

Page 33: ... or more beside T3 3 TC3 exceed 3 minutes Calculate from the end of latest defrost evaporator high temp Protection only closes outdoor fan with the compressor still running Add up to 90 minutes 11 8 2 Attention defrosting end or T3 20 TC2 the clock restart 11 8 3 Ending condition of defrosting If one of following conditions is satisfied end the defrost and turn into heating mode A The defrost time...

Page 34: ...r cannot start for 15 minutes reselect the operation mode according to the room temp and set temp or reselect when the set temp varies 11 10 Force cooling function 11 10 1Select forced cooling function with the forced cooling button or the switch 11 10 2The compressor is unconditionally turned on after 30 minutes cooling operation the unit turn to force auto mode 11 10 3All protections of remote c...

Page 35: ...ll 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 hours the unit stops 11 12 Auto restart function In case of a sudden power failure this function automatically sets the unit to previous settings before the power failure when power returns 11 13 Turbo mode In cooling mode when pre...

Page 36: ... 14A 14A 18A 18A I5MIN 20A 20A 20A 20A 24A 24A IFAN 22A 22A 22A 22A 26A 26A IRESTORE IDEFROST TE1 25 25 25 TE2 32 32 32 TE3 30 30 30 TE4 20 20 20 TE5 2 2 2 2 2 2 TE6 12 12 12 12 12 12 TE7 63 63 63 TE8 57 57 57 TE9 50 50 50 ANGLCOOL 67 67 67 67 67 67 ANGLHEAT 93 93 93 ANGLOFF 130 130 130 130 130 130 THDEFROST TMDEFROST TLDEFROST ...

Page 37: ... TIMER is set ON OFF OPERATION indicator TIMER indicator TEMPERATURE indicator 5 Signal receptor 13 2 Troubleshooting For models adopting electrical function Failure phenomenon Operation lamp Timer lamp Defrosting lamp Auto lamp Over current protection of the compressor occurs 4 times Indoor room temp sensor is open circuit or short circuit X X X Temp sensor on indoor evaporator is open circuit or...

Page 38: ...he indoor temp low than 10 C o Yes No Checkthe solenoid coil of reverse valve C heckthe over c urrent protector of c ompressor Replace the mainPCB board Recycle the refrige rant and recharge R eplace the re verse v alve Check the position and wiring of tem p sensor all of the m If wrong the unit w ill result in current prote ction not tem p C heck the soft starter mould Check the soft starter m ou...

Page 39: ...lace the display board Yes No Replace the display board Yes Yes Does the unit run in Forced Cool m ode Abnormaln oise from the indoor unit Does it happen in Fan Only mode Yes No Does it happ en with auto swing Check the swing motor Yes Check the swing louver Check the fan motor No Check the cross flow fan Replace the bear Does it just happen in the beginning of cooling or heating mode It is becaus...

Page 40: ... internal while running Compressor failure Replace the compressor if sounds coming from inner of the compressor Copper tubing Remove the cabinet and carefully rearrange tubing not to contact cabinet compressor Display board or indoor PCB failure Replace the display board If it is still false replace the PCB Battery failure Check the voltage of battery Replace batteries if the voltage is lower than...

Page 41: ...oard and replace the board if not within 10 of manufacturer s rating Replace the motor if the speed is not within 10 of manufacturer s rating but not because of the capacitor For electrical function 2 3 models Check the fan capacitor in indoor electric box for some models the capacitor is on main PCB and replace the capacitor or main PCB if not within 10 of manufacturer s rating Replace the motor ...

Page 42: ...ng mode will not perform Replace the reverse valve after checking the reason Water drainage failure Check the drainage pipe and repair if failure The indoor unit is incorrect installed Correct the installation if not correct Drainage pipe blocked Correct it The humidity in room is too high It s normal if the humidity in the room is over 85 Wiring failure Check wiring Correct if wrong wiring or loo...

Page 43: ...39 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 8778 32 7 2946 59 2 4468 6 25 4954 33 6 9814 60 2 3577 7 24 1932 34 6 6835 61 2 2725 8 22 5662 35 6 4002 62 2 1907 9 21 8094 36 6 1306 63 2 1124 10 20 7184 37 5 8736 64 2 0373 11 19 6891 38 5 6296 ...

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