Midea MSG-24CRN2 Service Manual
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Midea MSG-24CRN2 Service Manual

Split wall-mounted type
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MSG-24CRN2; MSG-24HRN2
MSG-30CRN2; MSG-30HRN2

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Summary of Contents for Midea MSG-24CRN2

  • Page 1 MSG-24CRN2; MSG-24HRN2 MSG-30CRN2; MSG-30HRN2...

  • Page 3: Table Of Contents

    Pumping down (Re-installation) ....................18 Re-air purging (Re-installation) ....................19 Balance refrigerant of the 2-way, 3-way valves................ 20 Evacuation ..........................21 Gas charging ........................... 22 Capacity table ......................23 MSG-24CRN2.......................... 23 MSG-24HRN2.......................... 23 MSG-30CRN2.......................... 24 MSG-30HRN2.......................... 24 Electronic function ....................25 10.1 Electronic control working environment ...................
  • Page 4 Content 10.10 Auto mode ..........................30 10.11 Force cooling function......................30 10.12 Sleep mode..........................31 10.13 Auto restart function......................... 31 Model and Parameters ....................33 Troubleshooting......................34 12.1 Display board........................... 34 12.2 Troubleshooting ........................35 12.3 Diagnostic chart ........................36 12.4 Resetting phenomenon often occurs during operation.............

  • Page 5: Precaution

    Service manual 1. Precaution Safety Precaution To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first. Warning Installation Do not use a defective or underrated circuit breaker.
  • Page 6 Service manual unit is so equipped.) Operational There is risk of physical injury, electric shock, or product failure. Do not expose the skin directly to cool air for long When the product is soaked (flooded or submerged), periods of time. (Do not sit in the draft). contact an Authorized service center.

  • Page 7: Function

    Service manual 2. Function Indoor unit Operation ON/OFF by remote controller Sensing by room temperature Room temperature sensor. Pipe temperature sensor. Room temperature control Maintain the room temperature in accordance with the setting temperature. Starting temperature control Indoor fan is delayed for 5 sec at the starting. Time Delay Safety control Restarting is for approx.
  • Page 8 Service manual Outdoor unit Power relay control The unit has 3 mins delay between continuously ON/OFF operations. Low ambient kit The unit can operate in cooling mode at low ambient temperature conditions. Low noise air flow system Bird tail propeller fan makes the outdoor unit run more quietly. Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode.

  • Page 9: Dimension

    Service manual 3. Dimension 3.1 Indoor unit Dimension Mode 1080 1080 3.2 Outdoor unit Dimension Mode - 5 -...

  • Page 10: Specification

    Service manual 4. Specification Model MSG-24CRN2 MSG-24HRN2 1, 220-240V~,50Hz 1, 220-240V~,50Hz Power supply Ph-V-Hz Capacity Btu/h 23000 23000 Input 2650 2650 Cooling Rated current 12.1 12.1 Btu/w.h 8.7, 2.54 8.7, 2.54 Capacity Btu/h ----- 26000 Input ----- 2570 Heating Rated current ----- 11.7...
  • Page 11 Service manual Model MSG-30CR MSG-30HR 1, 220-240V~,50Hz 1, 220-240V~,50Hz Power supply Ph-V-Hz Capacity Btu/h 27000 27000 Input 3230 3230 Cooling Rated current 14.8 14.8 Btu/w.h 8.4, 2.45 8.4, 2.45 Capacity Btu/h ----- 32000 Input ----- 3290 Heating Rated current ----- 15.1 ----- 2.85...
  • Page 12 Service manual Model MSG-30CR MSG-30HR 3Ph,380-420V,50Hz 3Ph,380-420V,50Hz Power supply Ph-V-Hz Capacity Btu/h 28000 28000 Input 3300 3300 Cooling Rated current Btu/w.h 8.5, 2.5 8.5, 2.5 Capacity Btu/h ----- 33000 Input ----- 3300 Heating Rated current ----- ----- Max. current Starting current Model HQ034YAA HQ034YAA...

  • Page 13: Refrigerant Cycle Diagram

    Service manual 5. Refrigerant cycle diagram Cooling only Heat pump mode - 9 -...

  • Page 14: Operation Limits

    Service manual 6. Operation limits 6.1 Cooling operation Outdoor unit air temp.℃ DB Indoor 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. 6.2 Heating operation Indoor air temp.

  • Page 15: Schematic Diagram And Wiring Diagram

    Service manual 7. Schematic diagram and Wiring diagram Schematic diagram - 11 -...

  • Page 16: Wiring Diagram

    Service manual Wiring diagram 7.2.1 Cooling mode MSG-24CR, MSG-30CR - 12 -...
  • Page 17 Service manual 7.2.2 Heating mode MSG-24HR, MSG-30HR - 13 -...
  • Page 18 Service manual 7.2.3 Cooling mode (3 Ph) MSG-30CR (3ph) - 14 -...
  • Page 19 Service manual 7.2.4 Heating mode (3 Ph) MSG-30HR (3ph) - 15 -...

  • Page 20: Installation Details

    Service manual 8. Installation details Wrench torque sheet for installation Outside diameter Torque inch Kg.m φ6.35 φ9.52 φ12.7 φ15.88 φ19.05 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Grade Unit Pipe length and the elevation Standard Max.

  • Page 21: Air Purging Of The Piping And Indoor Unit

    Service manual Air purging of the piping and indoor unit Required tools: Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector. Note: The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.

  • Page 22: Pumping Down (Re-Installation)

    Service manual Pumping down (Re-installation) Procedure 1. Confirm that both the 2-way and 3-way valves are set to the opened position. Remove the valve stem caps and confirm that the valve stems are in the opened position. Be sure to use a hexagonal wrench to operate the valve stems. 2.

  • Page 23: Re-Air Purging (Re-Installation)

    Service manual Re-air purging (Re-installation) Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the closed position. 2. Connect the charge set and a charging cylinder to the service port of the 3-way valve. Leave the valve on the charging cylinder closed. 3.

  • Page 24: Balance Refrigerant Of The 2-Way, 3-Way Valves

    Service manual 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. Leave the valve on the charge set closed. Connect the charge hose with the push pin to the service port.

  • Page 25: Evacuation

    Service manual 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).

  • Page 26: Gas Charging

    Service manual Gas charging Procedure: 1. Connect the charge hose to the charging cylinder. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. 2. Purge the air from the charge hose. Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant).

  • Page 27: Capacity Table

    Service manual 9. Capacity table MSG-24CRN2 OUTDOOR TEMPERATURE DRY SUMMER Cooling mode Indoor 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Conditions 21ºC D Total capacity kW 6.48 6.09 5.63 5.18 4.85 4.50 15ºC W Sensitive capacity kW 4.73 4.54 4.25 3.94 3.70...

  • Page 28: Msg-30Crn2

    Service manual MSG-30CRN2 OUTDOOR TEMPERATURE DRY SUMMER Cooling mode Indoor 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Conditions 21ºC D Total capacity kW 7.60 7.14 6.61 6.08 5.69 5.28 15ºC W Sensitive capacity kW 5.55 5.33 4.99 4.62 4.34 4.06 Input kW. 2.76 2.91 3.04...

  • Page 29: Electronic Function

    Service manual 10. Electronic function 10.1 Electronic control working environment Input voltage: 175~253V Input power frequency:50HZ Ambient temperature: -7°C+43°C Indoor fan normal working amp is less than 1A Outdoor fan normal working amp is less than 1.5A Four-way valve normal working amp is less than 1A Swing motor: DC12V Compressor: single-phase power supply.
  • Page 30 Service manual Current protection High temperature protection of indoor heat exchanger at heating mode Auto defrosting and heating recovery at heating mode Anti cold air at heating mode - 26 -...

  • Page 31: Protection

    Service manual 10.4 Protection 10.4.1 3 minutes delay at restart for compressor. 10.4.2 Sensor protection at open circuit and breaking disconnection 10.4.3 Fan Speed is out of control. When Indoor Fan Speed is too high(higher than High Fan+300RPM)or too low(lower than 400RPM), the unit stops and LED displays failure information and can’t returns to normal operation automatically.

  • Page 32: Dehumidifying Mode

    Service manual Compressor and outdoor fan on EVAP. temp. down EVAP. temp. up Compressor and outdoor fan off (after 5 mins) Condenser high temperature protection (only for heat pump) 10.7 Dehumidifying mode Indoor fan speed at low speed. Protection is same as cooling mode. 10.8 Heating mode 10.8.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode.

  • Page 33: Defrosting Mode(Available For Heating Mode)

    Service manual function prevails. Anti-cold wind control function at heating mode (T=indoor exchanger temp.) 10.8.5 Auto wind at heating mode (T=indoor temp.) 10.8.6 Indoor evaporator high-temperature protection at heating mode (T=indoor exchanger temp.) 10.8.7 The louver opens to Standard Angle ANGLHEAT when power is on for the first time 10.9 Defrosting mode(available for heating mode) 10.9.1 Defrosting condition: Defrost starts when either of the following:...

  • Page 34: Auto Mode

    Service manual the compressor still running. Add up to 90 minutes. 10.9.2 Conditions of defrost ending: Defrosting ends when either of the following: The time gets to 10 minutes. T3>20’C. The circulation is as following: 10.9.3 Defrosting Actions Defrost 10 or 6 minutes Compressor 4-way valve Outdoor fan...

  • Page 35: Sleep Mode

    Service manual Manual operation is controlled by touching buttons and divided into force cooling and forced auto mode. It transfer between these two modes by pressing the buttons, the cycling order of the button press is as below graph show to you. 10.12 Sleep mode 10.12.1 The sleep function is available at cooling, heating or auto mode...
  • Page 36 Service manual In case of a sudden power failure, this function automatically sets the unit to previous settings before the power failure when power returns - 32 -...

  • Page 37: Model And Parameters

    Service manual 11. Model and Parameters Model MSG-24CR MSG-24HR MSG-30CR MSG-30HR I3SEC [A] I5MIN [A] IFAN [A] IDEFROST [A] TE1 ['C] TE2 ['C] TE3 ['C] TE4 ['C] TE5 ['C] TE6 ['C] TE7 ['C] TE8 ['C] TE9 ['C] TE10 ['C] TE11 ['C] TE14 ['C] TE16 ['C] 3Ph 380~420V...

  • Page 38: Troubleshooting

    Service manual 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.

  • Page 39: Troubleshooting

    Service manual 12.2 Troubleshooting For cooling mode: Operation Timer Failure phenomenon lamp lamp Indoor fan speed has been out of control for over 1 minute ☆ Indoor room temp. or evaporator sensor is open circuit or short circuit ☆ Over current protection of the compressor occurs 4 times ☆...

  • Page 40: Diagnostic Chart

    Service manual 12.3 Diagnostic chart After energizing, no indicator is lighted and the air conditioner can’t be operated. - 36 -...

  • Page 41: Resetting Phenomenon Often Occurs During Operation

    Service manual 12.4 Resetting phenomenon often occurs during operation. (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 flashes and Timer lamp off.

  • Page 42: Operation Lamp Off And Timer Lamp Flashes

    Service manual 12.7 Operation lamp off and Timer lamp flashes 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. When such failure occurs, the main control board must have fault.

  • Page 43: Characteristic Of Temperature Sensor

    Service manual 13. Characteristic of temperature sensor Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ 62.2756 14.6181 4.3874 58.7079 13.918 4.2126 56.3694 13.2631 4.0459 52.2438 12.6431 3.8867 49.3161 12.0561 3.7348 46.5725 11.5 3.5896 10.9731 3.451 41.5878 10.4736 3.3185 39.8239 3.1918 37.1988 9.5507...

This manual is also suitable for:

Msg-24hrn2Msg-30crn2Msg-30hrn2

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