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  M thermal Split

202004                                                                                                                                                                                                                      51

4 Troubleshooting   

4.1 Warning 

 

All  electrical  work    must    be    carried    out    by  competent    and  suitably    qualified,    certified    and   
accredited  professionals  and  in  accordance  with  all  applicable  legislation  (all  national,  local  and  other  laws, 
standards, codes, rules, regulations and other legislation that apply in a given situation). 
Power-off the outdoor units before connecting or  disconnecting any connections  or wiring, otherwise electric 
shock (which can cause physical injury or death) may occur or damage to components may occur. 

Warning 

 

Midea CAC Confidential

Содержание HB-A100/CGN8-B

Страница 1: ...M Thermal A Series Split Commercial Air Conditioners R32 Service Manual Midea CAC Confidential...

Страница 2: ...thermal Split 202004 1 CONTENTS CONTENTS Part 1 General Information 3 Part 2 Component Layout and Refrigerant Circuits 7 Part 3 Control 17 Part 4 Diagnosis and Troubleshooting 31 Midea CAC Confidentia...

Страница 3: ...M thermal Split 2 202004 Midea M thermal Split Service Manual Midea CAC Confidential...

Страница 4: ...M thermal Split 202004 3 Part 1 General Information Part 1 General Information 1 Unit Capacities 4 2 External Appearance 5 Midea CAC Confidential...

Страница 5: ...full model names can be obtained by substituting the asterisk in the model name format given in the left hand column of the table above with the shortened model names given in the table For example th...

Страница 6: ...arance 2 1 Outdoor Unit Appearance Table 1 2 1 Outdoor unit appearance MHA V4 6 W D2N8 B MHA V8 10 12 14 16 W D2N8 MHA V12 14 16 W D2RN8 2 2 Hydronic Box Appearance Table 1 2 2 Hydronic box appearance...

Страница 7: ...M thermal Split 6 202004 Midea M thermal Split Service Manual Midea CAC Confidential...

Страница 8: ...art 2 Component Layout and Refrigerant Circuits Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components 8 2 Piping Diagrams 13 3 Refrigerant Flow Diagrams 15 202004 7 Midea...

Страница 9: ...rmal Split Service Manual 1 Layout of Functional Components 1 1 Outdoor Unit Layout MHA V4W D2N8 B MHA V6W D2N8 B Figure 2 1 1 MHA V4 6 W D2N8 B top view Figure 2 1 2 MHA V4 6 W D2N8 B front view 8 20...

Страница 10: ...mal Split Part 2 Component Layout and Refrigerant Circuits MHA V8W D2N8 B MHA V10W D2N8 B Figure 2 1 3 MHA V8 10 W D2N8 B top view Figure 2 1 4 MHA V8 10 W D2N8 B front view 202004 9 Midea CAC Confide...

Страница 11: ...it Midea M thermal Split Service Manual MHA V12W D2N8 B MHA V14W D2N8 B MHA V16W D2N8 B Figure 2 1 5 MHA V12 14 16 W D2N8 B top view Figure 2 1 6 MHA V12 14 16 W D2N8 B front view 10 202004 Midea CAC...

Страница 12: ...2 Component Layout and Refrigerant Circuits MHA V12W D2RN8 B MHA V14W D2RN8 B MHA V16W D2RN8 B Figure 2 1 7 MHA V12 14 16 W D2RN8 B top view Figure 2 1 8 MHA V12 14 16 W D2RN8 B front view 202004 11 M...

Страница 13: ...Manual 1 2 Hydronic Box Layout Figure 2 1 9 HB A60 100 160 CGN8 B oblique view Electric control box Expansion vessel Manometer Safety valve Air purge valve Water flow switch Water side heat exchanger...

Страница 14: ...V Controls refrigerant flow and reduces refrigerant pressure 2 Four way valve Controls refrigerant flow direction Closed in cooling mode and open in heating mode When closed the air side heat exchange...

Страница 15: ...oves air from the water circuit 2 Safety valve Prevents excessive water pressure by opening at 43 5 psi 3 bar and discharging water from the water circuit 3 Expansion vessel Balances water system pres...

Страница 16: ...sure switch Low pressure switch Air side heat exchanger 4 way valve High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure Electronic expansion valve cap...

Страница 17: ...M thermal Split Midea M thermal Split Service Manual 16 202004 Midea CAC Confidential...

Страница 18: ...ntrol Part 3 Control 1 Stop Operation 18 2 Standby Control 18 3 Startup Control 19 4 Normal Operation Control 22 5 Protection Control 23 6 Special Control 26 7 Role of Temperature Sensors in Control F...

Страница 19: ...d to prevent refrigerant from mixing with compressor oil when the compressors are stopped The crankcase heater is controlled according to outdoor ambient temperature and the compressor on off state Wh...

Страница 20: ...tartup follows one of two startup programs until the target rotation speed is reached Refer to Figure 3 3 1 Figure 3 3 2 Figure 3 3 1 MHA V4 6 W D2N8 B compressor startup program 1 when ambient temper...

Страница 21: ...32rps 42rps 56rps 66rps 70rps 40s 90s 60s 40s 40s 240s 82rps 240s 36rps 90s Notes 1 Once the first 40 second stage of the program is complete the program proceeds to the subsequent stages in a step by...

Страница 22: ...1 DC fan motor FAN Fan run at maximum speed 2 Electronic expansion valve EXV Position steps from 0 fully closed to 480 fully open controlled according to outdoor ambient temperature discharge temperat...

Страница 23: ...then runs the appropriate compressor startup program Refer to Part 3 3 2 Compressor Startup Program Once the startup program is complete the compressor runs at the target rotation speed 4 3 Compresso...

Страница 24: ...protects the compressor from transient spikes in pressure Figure 3 5 1 High pressure protection control Notes 1 Pc Discharge pressure When the discharge pressure rises above 4 3MPa the system displays...

Страница 25: ...the unit stops running When the discharge temperature is higher than suction temperature the compressor enters re start control 5 4 Compressor Current Protection Control This control protects the comp...

Страница 26: ...pm or more for more than 3 minutes Outdoor ambient temperature is below 4 C and actual fan speed differs from target fan speed by 300rpm or more for more than 3 minutes Actual fan speed is less than 1...

Страница 27: ...abel 4 16kW Control functions and states Inverter compressor COMP Runs at oil return operation rotation speed DC fan motor FAN Controlled according to heating mode Electronic expansion valve EXV 304 s...

Страница 28: ...temperature of each zone separately thus different type radiator will operate at its optimal temperature and water pump cycle time will be reduced to save energy Cooling mode In two zones control for...

Страница 29: ...water whilst heat pump runs heat mode cooling which can reduce the host selection and the initial investment 6 8 USB data transfer Convenient program upgrade No need to carry any other heavy equipment...

Страница 30: ...erature Sensors in Control Functions Figure 3 7 1 Location of the temperature sensors on M thermal Split systems Notes 1 The names and functions of the temperature sensors labelled 1 to 11 in this fig...

Страница 31: ...outlet temperature sensor T3 5 Water side heat exchanger refrigerant outlet gas pipe temperature sensor T2B 6 Water side heat exchanger refrigerant outlet liquid pipe temperature sensor T2 7 Water si...

Страница 32: ...M thermal Split 202004 31 Part 4 Diagnosis and Troubleshooting 1 Electric Control Box Layout 32 2 PCBs 35 3 Error Code Table 49 4 Troubleshooting 51 5 Appendix to Part 4 107 Midea CAC Confidential...

Страница 33: ...Layout 1 1 Outdoor Unit Electric Control Box Layout Figure 4 1 1 MHA V4 6 W D2N8 B electric control box Main PCB Inverter module Figure 4 1 2 MHA V8 10 W D2N8 B electric control box Main PCB Inverter...

Страница 34: ...Split 202004 33 Main PCB Inverter module Figure 4 1 4 MHA V12 14 16 W D2RN8 B electric control box Main PCB Inverter module Main Power Electric Reactor Filter board DCFAN Electric Reactor Midea CAC Co...

Страница 35: ...M thermal Split 34 202004 Midea M thermal Split Service Manual 1 2 Hydronic Box Electric Control Box Layout Figure 4 1 5 HB A60 100 160 CGN8 B Main control board Midea CAC Confidential...

Страница 36: ...are shown in Figures 4 1 1 to Figure 4 1 4 in Part 4 1 1 Outdoor Unit Electric Control Box Layout The locations of each PCB in the hydronic box electric control box are shown in Figures 4 1 5 in Part...

Страница 37: ...rmostat cooling mode CL Power port for room thermostat COM 18 CN35 Port for smart grid grid signal photovoltaic signal 19 CN36 Port for remote switch temperature board 20 CN19 Communicate port between...

Страница 38: ...3 Main PCBs for Refrigerant System Inverter Module Figure 4 2 2 MHA V4 6 8 10 W D2N8 B outdoor unit main PCB for refrigerant system 4 5 6 7 8 9 10 3 2 1 11 12 13 14 15 16 17 18 19 27 26 25 24 23 22 2...

Страница 39: ...nput port for live wire 12 CN9 Port for outdoor ambient temp sensor and condenser temp sensor 13 CN24 Input port for 12V 9V 14 CN1 Port for suction temp sensor 15 CN8 Port for discharge temp sensor 16...

Страница 40: ...thermal Split 202004 39 Figure 4 2 3 MHA V12 14 16 W D2N8 B outdoor unit main PCB for refrigerant system 4 5 6 7 8 9 10 3 2 1 11 12 13 14 15 16 17 18 19 27 26 25 24 23 22 21 20 Midea CAC Confidential...

Страница 41: ...nput port for live wire 12 CN9 Port for outdoor ambient temp sensor and condenser temp sensor 13 CN24 Input port for 12V 9V 14 CN1 Port for suction temp sensor 15 CN8 Port for discharge temp sensor 16...

Страница 42: ...mal Split 202004 41 Figure 4 2 4 MHA V12 14 16 W D2RN8 B outdoor unit main PCB for refrigerant system 1 2 3 4 5 6 7 8 30 29 9 10 11 12 13 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 Midea CAC Confide...

Страница 43: ...cation with main PCB for invert module board 13 CN6 Port for pressure sensor 14 CN36 Port for communication with main PCB for refrigerant system 15 CN5 Port for temp sensor Th 16 CN8 Port for temp sen...

Страница 44: ...M thermal Split 202004 43 Figure 4 2 5 MHA V4 6 8 10 W D2N8 B outdoor unit inverter module For 4 6kW model 1 2 3 8 7 4 5 6 9 For 8 10kW model 1 2 3 8 7 4 5 6 9 Midea CAC Confidential...

Страница 45: ...5 Code Content 1 U Compressor connection port U 2 V Compressor connection port V 3 W Compressor connection port W 4 CN20 Output port for 12V 9V 5 CN19 Port for fan 6 CN32 Port for communication with m...

Страница 46: ...6 Code Content 1 U Compressor connection port U 2 V Compressor connection port V 3 W Compressor connection port W 4 CN19 Port for fan 5 CN20 Output port for 12V 9V 6 CN32 Port for communication with m...

Страница 47: ...ut port for 15V 2 CN19 Compressor connection port W 3 CN18 Compressor connection port V 4 CN17 Compressor connection port U 5 CN15 Power Input port L3 6 CN7 Power Input port L2 7 CN5 Input port P_out...

Страница 48: ...01 Power supply L2 2 CN200 Power supply L3 3 CN203 Power supply N 4 CN212 Power supply port of 310VDC 5 CN211 Reserved 6 CN213 Port for FAN Reactor 7 CN214 Power supply port for Inverter module 8 PE3...

Страница 49: ...tion code Error or protection code 2 5 DIP switch setting and Modbus function Modbus function will be available in 2020 5 30 The rotating coded switch S3 0 F on the main control board of hydraulic mod...

Страница 50: ...water inlet temperature sensor error Sensor Tw_in EE 15 Hydronic box EEPROM error F1 116 DC generatrix voltage is too low H0 39 Communication error between outdoor unit main control chip and hydronic...

Страница 51: ...ffers from target frequency by more than 15Hz protection Pb 31 Water side heat exchanger anti freeze protection Pd 33 High temperature protection of refrigerant outlet temperature of condenser in cool...

Страница 52: ...ce with all applicable legislation all national local and other laws standards codes rules regulations and other legislation that apply in a given situation Power off the outdoor units before connecti...

Страница 53: ...s E8 has displayed 3 times When an E0 error occurs a manual system restart is required before the system can resume operation M thermal Split stops running Error code is displayed on hydronic box main...

Страница 54: ...increase its speed No Water flow switch is damaged Yes Replace the water flow switch No Internal circulator pump can t work Yes Turn off the power check the wire in the pump Once that is done the pum...

Страница 55: ...n 4 3 2 Phase sequence error Only applies to 3 phase models M thermal Split stops running Error code is displayed on outdoor unit main PCB and user interface Possible causes 4 3 3 Power supply phases...

Страница 56: ...sequence is inverted the compressor will operate inversely If the wiring connection of each outdoor unit is in A B C phase sequence and multiple units are connected the current difference between C p...

Страница 57: ...is displayed on hydronic box main PCB and user interface Possible causes 4 4 3 Communication wires between hydronic box and user interface not connected properly Communication wiring X Y E terminals...

Страница 58: ...high voltage 220V or higher wires Yes Ensure the communication wires and high voltage wires are separated No Communication wires are close to a source of electromagnetic radiation such as transformer...

Страница 59: ...ror Ed indicates a water side heat exchanger water inlet temperature sensor error HA indicates a water side heat exchanger water outlet temperature sensor error H5 indicates a room temperature sensor...

Страница 60: ...CB for Hydronic System Circuit 2 water outlet temperature sensor connection is port CN15 on the hydronic box main PCB labeled 14 in Figure 4 2 1 in Part4 2 2 Main PCB for Hydronic System Room temperat...

Страница 61: ...e sensor error E6 indicates an outdoor ambient temperature sensor error E9 indicates a suction pipe temperature sensor error EA indicates a discharge temperature sensor error M thermal Split stops run...

Страница 62: ...tem main PCB labeled 15 in Figure 4 2 2 Main PCBs for Refrigerant System Inverter Module 8 on the MHA V12 14 16 W D2N8 B outdoor unit refrigerant system main PCB labeled 15 in Figure 4 2 3 Main PCBs f...

Страница 63: ...er interface Possible causes 4 7 3 Hydronic box main PCB EEPROM is not connected properly Hydronic box main PCB damaged Procedure 4 7 4 EE Hydronic box main PCB EEPROM1 is not connected properly Yes E...

Страница 64: ...PCB and user interface Possible causes 4 8 3 The DC generatrix voltage is too low Procedure 4 8 4 F1 Power supply is abnormal Yes Provide normal power No LED on the Inverter Modules is lighting Yes Vo...

Страница 65: ...connected properly Yes Ensure the EEPROM is connected properly No Replace outdoor unit invert module Notes 1 Outdoor unit invert module EEPROM is designated IC320 on the MHA V4 6 8 10 W D2N8 B outdoo...

Страница 66: ...and hydronic box M thermal Split stops running Error code is displayed on hydronic box main PCB outdoor unit main PCB and user interface Possible causes 4 10 3 Power supply abnormal Transformer malfun...

Страница 67: ...on wires P Q E between main control board of outdoor unit and hydraulic module have short circuited disconnected or misconnected Yes Reconnect the communication wires No Replace outdoor unit main PCB...

Страница 68: ...B or inverter driven module damaged Procedure 4 11 4 H1 LED on the main control board of outdoor unit and inverter module are light Yes LED is not light the board is damaged or have short circuit No C...

Страница 69: ...hen HH error occurs a manual system restart is required before the system can resume operation The cause of HH error should be addressed promptly in order to avoid system damage M thermal Split stops...

Страница 70: ...iring Diagrams 2 Measure the voltage between the DC fan motor power supply wires The normal voltage is 15V when the unit is in standby If the voltage is significantly different from 15V the IPM module...

Страница 71: ...rmal Split stops running Error code is displayed on outdoor unit main PCB and user interface Possible causes 4 13 3 Power supply voltage not within 90 110 of rated voltage Outdoor unit main PCB is dam...

Страница 72: ...outdoor unit main PCB Notes 1 Measure the resistance among the three terminals of the pressure sensor If the resistance is of the order of mega Ohms or infinite the pressure sensor has failed The pres...

Страница 73: ...unning When the pressure rises above 0 3MPa P0 is removed and normal operation resumes HP indicates Pe 0 6Mpa occurred 3 times in an hour Error code is displayed on outdoor unit main PCB and user inte...

Страница 74: ...ck for insufficient refrigerant An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal discharge and suction pressures to be lower than normal and compressor...

Страница 75: ...ection and M thermal Split stops running When the discharge pressure falls below 3 6MPa P1 is removed and normal operation resumes Error code is displayed on outdoor unit main PCB and user interface P...

Страница 76: ...V12 14 16 W D2N8 B outdoor unit refrigerant system main PCB labeled 16 in Figure 4 2 3 in Part 4 2 3 Main PCB for Refrigerant System Inverter Module port CN31 on the MHA V12 14 16 W D2RN8 B outdoor u...

Страница 77: ...16kW single phase model 30A 12 14 16kW three phase model 14A the system displays P3 protection and M thermal Split stops running When the current returns to the normal range P3 is removed and normal o...

Страница 78: ...s and water flow switch for dirt blockages In cooling mode check air side heat exchanger fan and air outlets for dirt blockages 2 High pressure side blockage causes discharge temperature to be higher...

Страница 79: ...re rises above 115 C the system displays P4 protection and M thermal Split stops running When the discharge temperature falls below 95 C P4 is removed and normal operation resumes Error code is displa...

Страница 80: ...CB is loose4 Yes Ensure the pressure switch is connected properly No Pressure sensor has short circuited or failed5 Yes Replace the pressure sensor No The high pressure side is blocked caused by crush...

Страница 81: ...unctional Components and to Table 5 5 1 or 5 5 2 in Part 5 5 1 4 High pressure switch connection is port CN13 on the MHA V4 6 8 10 W D2N8 B outdoor unit refrigerant system main PCB labeled 16 in Figur...

Страница 82: ...exchanger water inlet and water outlet temperatures protection M thermal Split stops running Error code is displayed on hydronic box main PCB and user interface Possible causes 4 19 3 Temperature sen...

Страница 83: ...and fix the error No Replace hydronic box main PCB Notes 1 Water side heat exchanger water inlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port C...

Страница 84: ...o speed protection Excessive compressor frequency variation Actual compressor frequency differs from target frequency High pressure protection PED board self checking fail Specific error codes for inv...

Страница 85: ...y more than 15Hz protection Table 4 4 3 Errors indicated on LED single phase 4 10kW LED1 flashing pattern GREEN LED2 is always on RED Corresponding error Flashes 3 times and stops for 1 second then re...

Страница 86: ...damaged1 Yes Replace the inverter module2 Notes 1 Measure the resistance between each of U V and W and each of P and N on the inverter module All the resistances should be infinite If any of them are...

Страница 87: ...s as indicated by the labels on the compressor 2 Measure the resistance between each of U V and W and each of P and N on the inverter module All the resistances should be infinite If any of them are n...

Страница 88: ...Replace the inverter module3 Notes 1 Refer to Figure 4 4 2 2 Use clip on ammeter to measure the compressor current if the current is normal indicates the inverter module is failed if the current is a...

Страница 89: ...ion 1 L1 or L2 error appears immediately after the outdoor unit is powered on L1 L2 Power supply is abnormal Yes Re start the unit once the power supply has returned to normal No Replace the inverter...

Страница 90: ...Figure 4 4 2 Figure 4 4 4 Relay location of main PCB for refrigerant system Single phase 4 6 8 10kW unit Single phase 12 14 16kW unit Relay L5 L8 L9 troubleshooting 4 20 8 L5 L8 L9 The wire is not co...

Страница 91: ...ent protection Zero speed protection Excessive compressor frequency variation Actual compressor frequency differs from target frequency High pressure protection Contactor stuck or 908 self checking fa...

Страница 92: ...es 17 times and stops for 1 second then repeats L8 Compressor frequency variation greater than 15Hz within one second protection L9 Actual compressor frequency differs from target frequency by more th...

Страница 93: ...B the communication port between refrigerant system main control board for refrigerant system inverter module is port CN36 on refrigerant system main control board for refrigerant system port CN8 on...

Страница 94: ...e main PCB Notes 1 The DC bus wire should run from the N terminal on the inverter module through the current sensor in the direction indicated by the arrow on the current sensor and end at the N termi...

Страница 95: ...s 1 Connect the U V W wire from the inverter module to the correct compressor terminals as indicated by the labels on the compressor 2 Measure the voltage between each of W W V V U U and GND when the...

Страница 96: ...compressor No Replace the inverter module2 Notes 1 When replacing an inverter module a layer of thermally conductive silica gel should be painted on the IPM module on the reverse side of the inverter...

Страница 97: ...ately after the outdoor unit is powered on L1 L2 P N 15V wire on refrigerant system main PCB is not connected properly1 Yes Ensure P N 15V wire is connected properly No Voltage between N and 15 is abn...

Страница 98: ...obe on the DC power output negative terminal terminal 5 and put the black probe onto each of the AC power input terminals terminals 1 2 and 3 in turn The voltage between terminal 5 and each of termina...

Страница 99: ...60rps L4 Compressor is over current2 Yes Replace the compressor No Replace the inverter PCB Notes 1 Re start the unit use clip on ammeter to measure the compressor current if the current is normal in...

Страница 100: ...econds the system displays Pd protection and M Thermal Split stops running When the air side heat exchanger refrigerant outlet temperature returns drops below 55 C Pd is removed and normal operation r...

Страница 101: ...e MHA V4 6 8 10 W D2N8 B outdoor unit refrigerant system main PCB labeled 12 in Figure 4 2 2 in Part4 2 3 Main PCB for Refrigerant System Inverter Module port CN9 on the MHA V12 14 16 W D2N8 B outdoor...

Страница 102: ...er than outlet temperature in heating mode M thermal Split stops running Error code is displayed on hydronic box main PCB and user interface Hb indicates PP has displayed 3 times Possible causes 4 23...

Страница 103: ...xchanger water inlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN6 on the hydronic box main PCB labeled 10 in Figure 4 2 1 in Part4 2 2 Main...

Страница 104: ...running Error code is displayed on hydronic box main PCB and user interface Possible causes 4 24 3 Power supply voltage of the unit is low The space between the units is too narrow for heat exchanger...

Страница 105: ...low Yes There is air in system or pump head is not enough Release the air and reselect the pump No Water outlet temp sensor1 is loosen or broken Yes Reconnect it or change a new one Notes 1 Water sid...

Страница 106: ...display output 4 25 1 Description 4 25 2 PED PCB failure M thermal Split stops running Error code is displayed on hydronic box main PCB and user interface Possible causes 4 25 3 Power supply problem...

Страница 107: ...erve whether it can be recovered Yes Increase the power voltage to the required range No PED1 board broken Yes Replace PED PCB and power on again No IPM module broken Yes Replace IPM module and power...

Страница 108: ...water inlet temperature sensor or backup electric heater outlet water temperature sensor loose2 Yes Ensure the temperature sensor is connected properly No Water side heat exchanger water outlet tempe...

Страница 109: ...23 10 971 63 2 102 103 0 558 16 84 278 24 10 473 64 2 026 104 0 542 15 79 521 25 10 65 1 953 105 0 527 14 75 059 26 9 551 66 1 883 13 70 873 27 9 125 67 1 816 12 66 943 28 8 721 68 1 752 11 63 252 29...

Страница 110: ...38 31 62 78 7 321 118 2 233 1 190 5 39 30 36 79 7 086 119 2 174 0 180 9 40 29 15 80 6 859 120 2 117 1 171 9 41 28 00 81 6 641 121 2 061 2 163 3 42 26 90 82 6 430 122 2 007 3 155 2 43 25 86 83 6 228 12...

Страница 111: ...103 2 9960 16 379 69 24 51 396 64 10 526 104 2 9096 15 358 83 25 49 165 65 10 161 105 2 8262 14 339 24 26 47 043 66 9 8105 13 320 85 27 45 025 67 9 4736 12 303 56 28 43 104 68 9 1498 11 287 33 29 41 2...

Страница 112: ...midea com www midea group com Note Product specifications change from time to time as product improvements and developments are released and may vary from those in this document GD MIDEA Heating Venti...

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