Midea M2OE-14HFN1-Q Service Manual Download Page 37 | Manualshive

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DM16-01.01.11-01en

Service

manual

Multi DC inverter R410A. Outdoor unit

37

11.3.1.2 Indoor / outdoor units communication error

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Summary of Contents for M2OE-14HFN1-Q

Page 1: ...SERVICE MANUAL MIDEA AIRCONDITIONER SUPER DC INVERTER MULTI TYPE OUTDOOR UNITS M2OE 14HFN1 Q M2OF 18HFN1 Q M3OE 21HFN1 Q M3OE 27HFN1 Q M4OE 28HFN1 Q M4OB 36HFN1 Q M5OE 42HFN1 Q DM16 01 01 11 01en...

Page 2: ...TENTS 1 GENERAL INFORMATION OF OUTDOOR UNITS 3 2 FEATURES 4 3 SPECIFICATION 5 4 DIMENSIONS 10 5 REFRIGERATION CYCLE DIAGRAM 11 6 WIRING DIAGRAM 13 7 INDOOR UNITS COMBINATION 16 8 SOUND LEVELS 18 9 INS...

Page 3: ...utdoor unit 3 1 General information of Outdoor Units Model name Dimension mm M2OE 14HFN1 Q 800x333x554 M2OF 18HFN1 Q 800x333x554 M3OE 21HFN1 Q 845x363x702 M3OE 27HFN1 Q 845x363x702 M4OE 28HFN1 Q 946x4...

Page 4: ...y at operation mode It protects the valves and prevents water from dripping 4 way valve control It is only operated in the heating operation mode except defrosting operation Outdoor unit Power relay c...

Page 5: ...mber of rows 1 2 Tube pitch a row pitch b mm 21x13 37 25 4x22 Fin spacing mm 1 2 1 4 Fin type Hydrophilic aluminium Hydrophilic aluminium Tube outside dia and type mm 7 innergroove tube 9 52 innergroo...

Page 6: ...apacitor F Speed Hi Med Lo r min 750 750 Outdoor coil Number of rows 2 2 Tube pitch a row pitch b mm 21x13 37 25 4x22 Fin spacing mm 1 2 1 4 Fin type Hydrophilic aluminium Hydrophilic aluminium Tube o...

Page 7: ...ed Hi Med Lo r min 800 Outdoor coil Number of rows 1 6 Tube pitch a row pitch b mm 25 4x22 Fin spacing mm 1 3 Fin type Hydrophilic aluminium Tube outside dia and type mm 9 52 innergroove tube Coil len...

Page 8: ...itor F Speed Hi Med Lo r min 900 Outdoor coil Number of rows 2 Tube pitch a row pitch b mm 25 4x22 Fin spacing mm 1 3 Fin type Hydrophilic aluminium Tube outside dia and type mm 9 52 innergroove tube...

Page 9: ...Output W 120 Output Capacitor F Speed Hi Med Lo r min 900 Outdoor coil Number of rows 2 6 Tube pitch a row pitch b mm 25 4x22 Fin spacing mm 1 3 Fin type Hydrophilic aluminium Tube outside dia and typ...

Page 10: ...odel Unit mm W D H W1 A B M2OE 14HFN1 Q 800 333 554 860 514 340 M2OF 18HFN1 Q 800 333 554 860 514 340 M3OE 21HFN1 Q 845 363 702 923 540 350 M3OE 27HFN1 Q 845 363 702 923 540 350 M4OE 28HFN1 Q 946 410...

Page 11: ...CHECK VALVE CAPILIARY TUBE EXV B CAPILIARY B LIQUID VALVE B GAS VALVE B Accumulator T2B A Evaporator temp sensor outlet T2B B 5 2 Refrigeration circuit drawing of inverter 1 drive 3 type LIQUID VALVE...

Page 12: ...VE D Accumulator High pressure switch Low pressure switch T2B A Evaporator temp sensor outlet T2B B T2B C T2B D 5 4 Refrigeration circuit drawing of inverter 1 drive 5 type LIQUID VALVE A GAS VALVE A...

Page 13: ...DM16 01 01 11 01en Service manual Multi DC inverter R410A Outdoor unit 13 6 Wiring diagram M2OE 14HFN1 Q M2OF 18HFN1 Q M3OE 21HFN1 Q M3OE 27HFN1 Q...

Page 14: ...Service manual DM16 01 01 11 01en 14 Multi DC inverter R410A Outdoor unit M4OE 28HFN1 Q M4OB 36HFN1 Q...

Page 15: ...DM16 01 01 11 01en Service manual Multi DC inverter R410A Outdoor unit 15 M5OE 42HFN1 Q...

Page 16: ...12 7 9 9 7 12 12 7 4 Indoor unit combination for M3OE 27HFN1 Q One unit Two unit Three unit 7 7 7 9 9 12 18 7 7 7 7 9 9 7 12 18 9 12 12 9 7 9 9 12 18 18 7 7 9 7 9 12 9 9 9 9 12 18 12 7 12 9 18 7 7 12...

Page 17: ...12 18 Five Unit 7 7 7 7 7 7 7 7 9 18 7 7 9 9 24 7 9 9 12 12 9 9 9 12 12 7 7 7 7 9 7 7 7 9 24 7 7 9 12 18 7 9 9 12 18 9 9 9 12 18 7 7 7 7 12 7 7 7 12 18 7 7 12 12 12 7 9 12 12 12 9 9 12 12 12 7 7 7 7 1...

Page 18: ...unit 8 Sound Levels H 1 0m Outdoor Unit Microphone Note H 0 5 height of outdoor unit Model Noise Power dB A Noise level dB A M2OE 14HFN1 Q M2OF 18HFN1 Q 65 56 5 M3OE 21HFN1 Q 65 57 5 M3OE 27HFN1 Q 68...

Page 19: ...which located on the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 9 3 Pipe length and the elevation Maximum piping length and height difference 1 dri...

Page 20: ...4 Gas 9 52 3 8 12 7 1 2 9 4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below Pressure in the system rises Operating current rises Cooling o...

Page 21: ...ure can t achieve 0 1Mpa after pumping 50 minutes please check if there are some leakage points Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump Confirm...

Page 22: ...r purging the air use a torque wrench to tighten the flare nut 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...

Page 23: ...r and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air condit...

Page 24: ...the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Op...

Page 25: ...andle lo to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it...

Page 26: ...minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refriger...

Page 27: ...3 way valves are set to the opened position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 4 Close the...

Page 28: ...ecord the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged wi...

Page 29: ...splays 0 5s During the oil return process The LED displays RO or alternative displays between running frequency and RO each displays 0 5s In low ambient cooling mode the LED displays LC or alternative...

Page 30: ...ube will show 23 B indoor unit room temp T1B 24 C indoor unit room temp T1C 25 D indoor unit room temp T1D 26 E indoor unit room temp T1E 27 A indoor unit evaporator temp T2A If the temp is lower than...

Page 31: ...ze 4 Super breeze 5 45 The last error or protection code 00 means no malfunction and protection 10 5 Protection 10 5 1 Three minutes delay at restart for compressor 10 5 2 Temperature protection of co...

Page 32: ...me Off Decrease Hold 10 5 7 Outdoor unit anti freezing protection When T2 4 for 250 seconds or T2 0 the indoor unit capacity demand will be zero and resume to normal when T2 8 and the time of protecti...

Page 33: ...Low outdoor ambient temperature protection When compressor is off T4 is be lower than 35 for 10s the AC will stop and display LP When compressor is on T4 is be lower than 40 for 10s the AC will stop...

Page 34: ...other type Malfunction Error Code Timer Lamp Operation Lamp flashes Indoor EEPROM malfunction E0 X 1 Communication malfunction between indoor and outdoor units E1 X 2 Indoor fan speed has been out of...

Page 35: ...temperature sensor or connector of sensor is defective F2 No B Indoor unit coil outlet temperature sensor or connector of sensor is defective F3 No C Indoor unit coil outlet temperature sensor or con...

Page 36: ...C inverter R410A Outdoor unit 11 3 Trouble shooting 11 3 1 For the indoor unit 11 3 1 1 Indoor EEPROM malfunction EEPROM An electrically erasable programmable read only memory whose contents can be er...

Page 37: ...DM16 01 01 11 01en Service manual Multi DC inverter R410A Outdoor unit 37 11 3 1 2 Indoor outdoor units communication error...

Page 38: ...DC inverter R410A Outdoor unit Pic 2 IPM or outdoor main PCB Self Check Power Operating Self Check Operating Pic 2 IPM or outdoor main PCB Pic 1 check the voltage of N to S Vs is it moving alternately...

Page 39: ...01 01 11 01en Service manual Multi DC inverter R410A Outdoor unit 39 PIC 3 Main board LED when power on and unit standby PIC 4 check point button Press 1 time for check how many indoor units are conne...

Page 40: ...tage of pin1 and pin2 If the value of the voltage is less than 100V 208 240V power supply or 50V 115V power supply the PCB must have problems and need to be replaced 2 Indoor DC fan motor control chip...

Page 41: ...ut and output For split type NO Color Signal Voltage 1 Red Vs Vm 280V 380V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V For other types NO Color Signal Voltage 1 Red Vs...

Page 42: ...circuit of temperature sensor Check the connections between temperature sensor and PCB Are the connections good Correct the connections No Yes No Replace the sensor Replace the indoor PCB Measure the...

Page 43: ...i DC inverter R410A Outdoor unit 43 11 3 2 For the outdoor unit 11 3 2 1 Outdoor EEPROM malfunction ODU E0 EEPROM An electrically erasable programmable read only memory whose contents can be erased an...

Page 44: ...Service manual DM16 01 01 11 01en 44 Multi DC inverter R410A Outdoor unit 11 3 2 2 Communication malfunction between IPM board and outdoor main board ODU E3...

Page 45: ...between L L1 and N L2 is about 220 240VAC Check the power supply Check whether the voltage of IPM board P and N is normal DC277 356V for 18 27KBtu h DC277 410V for 36 42KBtu h Replace bridge rectifier...

Page 46: ...motor Power on and when the unit is in standby measure the voltage of pin1 pin3 pin4 pin3 in fan motor connector If the value of the voltage is not in the range showing in below table the PCB must ha...

Page 47: ...DM16 01 01 11 01en Service manual Multi DC inverter R410A Outdoor unit 47 11 3 2 5 High pressure protection ODU P1 ForM4OE 28HFN1 Q M4OB 36HFN1 Q M5OE 42HFN1 Q...

Page 48: ...alue is o Yes Yes Connect it well Replace outdoor main board No Replace low pressure protector No Whether the low pressure protector is broken Check whether the outdoor ambient temperature is too low...

Page 49: ...DM16 01 01 11 01en Service manual Multi DC inverter R410A Outdoor unit 49 11 3 2 7 Current protection of compressor ODU P3...

Page 50: ...he connection is right between compressor discharge temp sensor and PCB according to wiring diagrams Measure the resistance value of compressor discharge temp sensor If the value is not normal is norm...

Page 51: ...place the temperature sensor No No Check whether the outdoor ambient temperature is higher than 50 No Stop the unit Yes Check if the outdoor unit ventilation is good Yes Make the outdoor unit ventilat...

Page 52: ...work normally No Replace the compressor check whether the system can work normally Check whether the lines in E part box are connected tightly Yes Connect it tightly check ok or not No No Yes No Repla...

Page 53: ...ing Disconnect the temperature sensor from PCB measure the resistance value with a tester Temperature Sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient...

Page 54: ...15 0 41164 4 44 0000 36 6 13059 76 1 34105 116 0 40060 3 41 5878 37 5 87359 77 1 29078 117 0 38991 2 39 8239 38 5 62961 78 1 25423 118 0 37956 1 37 1988 39 5 39689 79 1 21330 119 0 36954 0 35 2024 40...

Page 55: ...59 6 247 8 34 37 3 74 8 358 114 2 489 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 82 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2 233 1 190 5 39 30 36 79...

Page 56: ...ti DC inverter R410A Outdoor unit 2 Compressor checking Measure the resistance value of each winding by using the tester Position Resistance Value ASN108D22UEZ ASM135D23UFZ ATF235D22UMT ATF310D43UMT B...

Page 57: ...digital tester to measure the resistance between P and UVWN UVW and N Digital tester Normal resistance value Digital tester Normal resistance value Red Black Several M Red Black Several M P N U N U V...

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