Table of Contents
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Table of Contents
Troubleshooting
Related Manuals for Midea MSG-24CR
Summary of Contents for Midea MSG-24CR
- Page 1 MSG-24CR; MSG-24HR MSG-30CR; MSG-30HR MSG-36CR; MSG-36HR...
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Page 3: Table Of Contents
Pumping down (Re-installation)....................26 Re-air purging (Re-installation)....................27 Balance refrigerant of the 2-way, 3-way valves................28 Evacuation ..........................29 Gas charging ..........................30 Capacity table......................31 MSG-24CR ..........................31 MSG-24HR ..........................31 MSG-30CR ..........................32 MSG-30HR ..........................32 MSG-36CR ..........................33 MSG-36HR ..........................33 Electronic function.....................34... - Page 4 Content 10.8 Heating mode ..........................37 10.9 Defrosting mode(available for heating mode) ................38 10.10 Auto mode ..........................39 10.11 Force cooling function ........................ 39 10.12 Sleep mode..........................40 10.13 Auto restart function........................41 Model and Parameters....................42 Troubleshooting ......................43 12.1 Display board..........................
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Page 5: Precaution
Service manual 1. Precaution Safety Precaution n To prevent injury to the user or other people and property damage, the following instructions must be followed. n Incorrect operation due to ignoring instruction will cause harm or damage. n Before service unit, be sure to read this service manual at first. Warning Ø... - Page 6 Service manual unit is so equipped.) Ø Operational There is risk of physical injury, electric shock, or product failure. n Do not expose the skin directly to cool air for long n When the product is soaked (flooded or submerged), periods of time.
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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.
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Page 9: Dimension
Service manual 3. Dimension 3.1 Indoor unit Dimension Mode 1080 1080 1250 - 5 -... -
Page 10: Outdoor Unit
Service manual 3.2 Outdoor unit Dimension Mode - 6 -... -
Page 11: Specification
Service manual 4. Specification Model MSG-24CR MSG-24HR Power supply Ph-V-Hz 1, 220-240V~,50Hz 1, 220-240V~,50Hz Capacity Btu/h 24000 24000 Input 2750 2750 Cooling Rated current 12.5 12.5 Btu/w.h 8.7, 2.6 8.7, 2.6 Capacity Btu/h 27000 ----- Input ----- 2750 Heating Rated current 12.5... - Page 12 Service manual Model MSG-30CR MSG-30HR Power supply Ph-V-Hz 1, 220-240V~,50Hz 1, 220-240V~,50Hz Capacity Btu/h 28000 28000 Input 3200 3200 Cooling Rated current Btu/w.h Capacity Btu/h ----- 30000 Input ----- 3100 Heating Rated current 14.5 ----- ----- Max. current Starting current Model ZR34KH-PFJ-522 ZR34KH-PFJ-522...
- Page 13 Service manual Model MSG-36CR MSG-36HR Power supply Ph-V-Hz 1, 220-240V~, 50Hz 1, 220-240V~, 50Hz Capacity Btu/h 35000 35000 Input 4120 4120 Cooling Rated current 18.6 18.6 Btu/w.h Capacity Btu/h 38000 ----- Input 4100 ----- Heating Rated current 18.5 ----- ----- Max.
- Page 14 Service manual Model MSG-30CR MSG-30HR Power supply Ph-V-Hz 3Ph,380-420V,50Hz 3Ph,380-420V,50Hz Capacity Btu/h 28000 28000 Input 3000 3000 Cooling Rated current Btu/w.h Capacity Btu/h 32000 ----- Input ----- 3000 Heating Rated current ----- ----- 10.7 Max. current Starting current Model ZR34KH-TFD-522 ZR34KH-TFD-522 Type Scroll...
- Page 15 Service manual Model MSG-36CR MSG-36HR Power supply Ph-V-Hz 3, 380-420V~, 50Hz 3, 380-420V~, 50Hz Capacity Btu/h 35000 35000 Input 4120 4120 Cooling Rated current Btu/w.h Capacity Btu/h ----- 38000 Input ----- 4100 Heating Rated current ----- ----- Max. current Starting current Model ZR34KH-TFD-522 ZR34KH-TFD-522...
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Page 16: Refrigerant Cycle Diagram
Service manual 5. Refrigerant cycle diagram Ø Cooling only Ø Heat pump mode - 12 -... -
Page 17: 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 18 Service manual However, excludes the initial pull-down stage. - 14 -...
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Page 19: Schematic Diagram And Wiring Diagram
Service manual 7. Schematic diagram and Wiring diagram Schematic diagram - 15 -... -
Page 20: Wiring Diagram
Service manual Wiring diagram 7.2.1 Cooling mode MSG-24CR, MSG-30CR - 16 -... - Page 21 Service manual MSG-36CR - 17 -...
- Page 22 Service manual 7.2.2 Heating mode MSG-24HR, MSG-30HR - 18 -...
- Page 23 Service manual MSG-36HR - 19 -...
- Page 24 Service manual 7.2.3 Cooling mode (3 Ph) MSG-30CR (3ph) - 20 -...
- Page 25 Service manual MSG-36CR (3ph) - 21 -...
- Page 26 Service manual 7.2.4 Heating mode (3 Ph) MSG-30HR (3ph) - 22 -...
- Page 27 Service manual MSG-36HR (3ph) - 23 -...
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Page 28: 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 29: 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 30: 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 31: 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 32: 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. §... -
Page 33: 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. -
Page 34: 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. §... -
Page 35: Capacity Table
Service manual 9. Capacity table MSG-24CR SUMMER Cooling mode OUTDOOR TEMPERATURE DRY Indoor 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Conditions 21ºC D Total capacity kW 6.76 6.35 5.88 5.41 5.05 4.69 15ºC W Sensitive capacity kW 4.93 4.74 4.44 4.11 3.86... -
Page 36: Msg-30Cr
Service manual MSG-30CR OUTDOOR TEMPERATURE DRY SUMMER Cooling mode Indoor 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Conditions 21ºC D Total capacity kW 7.88 7.40 6.86 6.31 5.90 5.47 15ºC W Sensitive capacity kW 5.75 5.52 5.18 4.79 4.50 4.21 Input kW. 2.74 2.89 3.01... -
Page 37: Msg-36Cr
Service manual MSG-36CR SUMMER Cooling mode OUTDOOR TEMPERATURE DRY Indoor 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Conditions 21ºC D Total capacity kW 9.87 9.27 8.59 7.90 7.38 6.85 15ºC W Sensitive capacity kW 7.21 6.92 6.48 6.00 5.64 5.28 Input kW. 3.52 3.72 3.87... -
Page 38: 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 39 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 - 35 -...
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Page 40: 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 41: Dehumidifying Mode
Service manual 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. 4-way valve must delay 2 minutes compared with compressor if the compressor changed into non-heating mode or turned off. -
Page 42: 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 43: 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 44: Sleep Mode
Service manual In forced auto status the A/C operates at remote control mode with a set temp. of 24℃ 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. -
Page 45: Auto Restart Function
Service manual set temp will decrease 1℃,if it is under heating mode; the set 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 change. The total time is 7 hours, after 7 hours the unit stops. -
Page 46: Model And Parameters
Service manual 11. Model and Parameters Model MSG-24CR MSG-24HR MSG-30CR MSG-30HR MSG-36CR MSG-36HR 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]... -
Page 47: 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 48: 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 49: Diagnostic Chart
Service manual 12.3 Diagnostic chart After energizing, no indicator is lighted and the air conditioner can’t be operated. - 45 -... -
Page 50: 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: Resetting phenomenon often occurs during operation. -
Page 51: 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 52: 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...