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Troubleshooting
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Summary of Contents for Midea MSG-30CRN1-QB9P
- Page 1 MSG-30CRN1-QB9P; MSG-30HRN1-QB9P MSG-36CRN1-QB8P; MSG-36HRN1-QB8P...
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Page 3: Table Of Contents
Content Content Precaution ........................1 Safety Precaution ........................1 Warning ............................. 1 Function ........................3 Dimension ........................5 Indoor unit ..........................5 Outdoor unit ..........................5 Specification ........................ 6 Refrigerant cycle diagram ................... 8 Operation limits ......................9 Cooling operation ........................9 Heating operation ........................ - Page 4 Content 10.10 Auto mode ..........................27 10.11 Force cooling function ......................27 10.12 Sleep mode ..........................28 10.13 Auto restart function ......................... 29 Model and Parameters ....................29 Troubleshooting ......................30 12.1 Display board ........................... 30 12.2 Troubleshooting ........................31 12.3 Diagnostic chart ........................
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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.
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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 1250 1250 3.2 Outdoor unit Dimension Mode - 5 -... -
Page 10: Specification
Service manual 4. Specification Model MSG-30CRN1-QB9P MSG-30HRN1-QB9P 1, 220-240V~,50Hz 1, 220-240V~,50Hz Power supply Ph-V-Hz Capacity Btu/h 28000 28000 Input 2880 2880 Cooling Rated current 13.6 13.6 Btu/w.h Capacity Btu/h ----- 30000 Input ----- 2760 Heating Rated current ----- 13.2 ----- Max. - Page 11 Service manual Model MSG-36CRN1-QB8P MSG-36HRN1-QB8P 1, 220-240V~, 50Hz 1, 220-240V~, 50Hz Power supply Ph-V-Hz 35000 35000 Capacity Btu/h 3550 3550 Input Cooling 16.9 16.9 Rated current Btu/w.h 9.56 9.56 Capacity Btu/h 38000 ----- Input 4280 ----- Heating 18.8 Rated current ----- ----- 10.2...
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Page 12: Refrigerant Cycle Diagram
Service manual 5. Refrigerant cycle diagram Cooling only Heat pump mode - 8 -... -
Page 13: 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 14: Schematic Diagram And Wiring Diagram
Service manual 7. Schematic diagram and Wiring diagram Schematic diagram - 10 -... -
Page 15: Wiring Diagram
Service manual Wiring diagram 7.2.1 Cooling and heating pump mode (indoor unit) MSG-30C(H)RN1-QB9P, MSG-36C(H)RN1-QB8P 7.2.2 Cooling mode (outdoor unit) MSG—28CRN1-QB9P,MSG-36CRN1-QB8P - 11 -... -
Page 16: Installation Details
Service manual 7.2.3 heating pump mode (outdoor unit) MSG-30HRN1-QB9P,MSG-36HRN1-QB8P 8. Installation details Wrench torque sheet for installation Outside diameter Torque inch Kg.m φ9.52 φ16.0 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Grade Unit 3. -
Page 17: Pipe Length And The Elevation
Service manual Pipe length and the elevation Standard Max. Max. Additional length Capacity Pipe size Elevation Elevation refrigerant Btu/h LIQUID B (m) A (m) (g/m) 5/8’’ (φ16.0) 3/8’’ (φ9.52) 5/8’’ (φ16.0) 3/8’’ (φ9.52) In case that more than Caution: Capacity is base on standard length and maximum allowance length is base of reliability. Oil trap should be install per 5-7 meters. - Page 18 Service manual Procedure 7. Mounted the valve stem nuts to the 2-way 1. Recheck the piping connections. and 3-way valves. 2. Open the valve stem of the 2-way valve 8. Check for gas leakage. At this time, especially check for gas leakage counterclockwise approximately 90’, wait from the 2-way and 3-way stem nuts, and 10 seconds, and then set it to closed...
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Page 19: 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 20: 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 21: 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 22: 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 23: 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 24: Capacity Table
Service manual 9. Capacity table MSG-30CR N1-QB9P 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... -
Page 25: Msg-36Crn1-Qb8P
Service manual MSG-36CRN1-QB8P OUTDOOR TEMPERATURE DRY SUMMER Cooling mode 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 26: Electronic Function
Service manual 10. Electronic function 10.1 Electronic control working environment Input voltage: 198~253V 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 27 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 - 23 -...
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Page 28: 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 29: 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 30: 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 31: 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 32: 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 33: Auto Restart Function
Service manual 10.13 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. Model and Parameters 1PH,198V-253V,50Hz Model MSG-28CRN1-QB9PMSG-28HRN1-QB9PMSG-36CRN1-QB8P MSG-36HRN1-QB8P I3SEC [A] I5MIN [A] IFAN [A] IDEFROST [A] TE1 ['C]... -
Page 34: 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 35: 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 36: Diagnostic Chart
Service manual 12.3 Diagnostic chart After energizing, no indicator is lighted and the air conditioner can’t be operated. - 32 -... -
Page 37: 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 38: 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 39: 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...
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