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MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF

Troubleshooting 79

5.14.1 L0/L8/L9 troubleshooting

Step 1:

Replace the modular with correctly wire connection and start the system, if system is still

malfunction, then go to step2 to check the compressor.

Step 2:

Take out the compressor from the malfunction system, short-circuit the suction and the discharge,

vacuum dry and charge 0.3kg~0.4kg R410A, and then connect the U,V,W terminals to control box B which

is took apart from normal system.

If the compressor start normally, that means compressor is OK, control box A is malfunction, then check

the inverter module.

If the compressor could not start normally, that means the compressor is malfunction, the go to step 3 to

check the compressor.

Step 3:

Check the compressor

Measure the resistance between each two of U, V, W terminals, all the resistance should be the same

and equal to 0.9~5 Ohms. (Fig. A and Fig. B)

Measure the resistance between each of U, V, W terminals to ground (Fig. C), all the resistance should

be the same and trend to be infinity (Fig. D), otherwise the compressor has been malfunction, needs to be

replaced.

Control box A

which is took

apart from

malfunction

system.

Control box B

which is took

apart from

normal

system.

Compressor

which is took

apart from

malfunction

system.

Fig. A

Fig. C

Fig. B

Fig. D

Содержание MDV-120W/DON1

Страница 1: ...1 phase 220 240V 50Hz 1 phase 208 230V 60Hz MDV 120W DON1 MDV 140W DON1 MDV 160W DON1 Model TechnicalServiceManual Mini VRF ...

Страница 2: ...on 1 Part 2 Specifications Performances 9 Part 3 Installation 44 Part 4 Troubleshooting 58 Manufacture reserves the right to discontinue or change at any time specifications or designs without notices and without incurring obligations ...

Страница 3: ......

Страница 4: ...MCAC VTSM 2016 02 R410A All DC Inverter Mini VRF General Information 1 Part 1 General Information 1 Product Lineup 2 2 Nomenclature 3 3 Features 4 4 Indoor Units Lineup 7 ...

Страница 5: ...odel name Dimension body mm Net Gross weight kg Power supply MDV 120W DON1 Width 900 Height 1327 Depth 400 95 105 220 240V 50Hz 208 230V 60Hz MDV 140W DON1 Width 900 Height 1327 Depth 400 99 109 220 240V 50Hz 208 230V 60Hz MDV 160W DON1 Width 900 Height 1327 Depth 400 100 110 220 240V 50Hz 208 230V 60Hz ...

Страница 6: ...ral Information 3 2 Nomenclature M D V 120 W D O N1 Note the actual cooling capacity please refer to the nameplate Refrigerant type N1 R410A Power Supply O 220 240V 50Hz 208 230V 60Hz Inverter Type D DC Inverter W Outdoor unit Cooling Capacity 100W Midea ...

Страница 7: ...stance save more power and enhance heat exchange performance Hydrophilic film fins and inner threaded copper pipes optimize heat exchange efficiency 3 3 Newly designed air outlet grill Optimally designed fan shape and newly designed grill ensure both safety and air volume New air outlet grill Compressor Twin Rotary structure Highly Efficient DC Motor Creative motor core design High density neodymi...

Страница 8: ...ght commercial areas such as villas restaurants usually it need more than one indoor unit which in turn requires multiple outdoor units Midea s Mini VRF system solves this problem and retains buildings original aesthetics The longest piping length is 70m The first branch joint to the farthest IDU is 20m The IDU to the nearest branch joint is 15m Level difference between IDU and ODU is 30m Level di...

Страница 9: ...door unit s address 3 8 More Convenient Piping Connector Branch Box Easier and safer installation thanks to a branch box that simplifies piping work and the adoption of screw connection Both left and right pipe flare connectin from outdoor unit to branch box is reserved which greatly simplifies field installation 3 9 Four Way Piping Connection A four direction space is available for connecting pip...

Страница 10: ...cassette Four way cassette 15 18 22 28 36 45 56 71 80 90 100 112 140 Capacity 100W Duct type Low static pressure duct Medium static pressure duct High static pressure duct 15 18 22 28 36 45 56 71 80 90 100 112 140 160 Capacity 100W Floor standing Ceiling Floor Console Floor standing exposed Floor standing concealed Ceiling floor console 22 28 36 45 56 71 80 90 112 140 160 ...

Страница 11: ... Wall mounted R panel 15 22 28 36 45 56 71 80 90 Note If ODU connect only one IDU the capacity of IDU should be not more than ODU If ODU connect more than one IDU the capacity of each IDU should be not more than 8kW for refrigerant uniform distribution Due to continuous improvement specifications are subject to change without prior notice ...

Страница 12: ...tions Performance 9 Part 2 Specifications Performance 1 Specifications 10 2 Dimensions 12 3 Service Space 13 4 Piping Diagrams 14 5 Wiring Diagrams 15 6 Field Wiring 16 7 Capacity Tables 17 8 Electric Characteristics 41 9 Sound Levels 42 10 Operation Limits 43 ...

Страница 13: ...or fan motor Model WZDK100 38G Type DC Motor Brand Panasonic Nidec Insulation class E Safe class IP23 Input W 2 100 Output W 2 85 Rated current A 2 0 9 Speed r min 800 Outdoor fan Material ASG20 Type Axial fan Diameter mm 508 Height mm 170 Outdoor coil Number of rows 1 5 2 2 Tube pitch a row pitch b mm 25 4 22 Fin spacing mm 1 4 Fin type code Hydrophilic aluminum Tube outside dia and type mm Ф7 94...

Страница 14: ...r units m 8 Ambient temperaure Cooling 15 to 46 Heating 15 to 27 Notes Capacities are based on the following conditions Cooling Indoor temperature 27 DB 19 WB Outdoor temperature 35 DB 24 WB Heating Indoor temperature 20 DB 15 WB Outdoor temperature 7 DB 6 WB Piping length Interconnecting piping length is 7 5m level difference is zero Sound values are measured in a semi anechoic room at a position...

Страница 15: ...R410A All DC Inverter Mini VRF MCAC VTSM 2016 02 12 Specifications Performance 2 Dimensions Unit mm MODEL A B C D E F H 120 140 160 900 600 366 320 400 360 1327 H A B C D E F ...

Страница 16: ... Performance 13 3 Service Space Unit mm 300 600 300 2000 Wall or obstacle Maintain channel Air outlet Air inlet Air inlet Single unit installation 600 2000 300 Parallel connect the two units or above 2000 500 3000 3000 300 Parallel connect the front with rear sides ...

Страница 17: ...essure liquid receiver It is used to store the liquid refrigerant and oil it can protect the compressor from liquid hammer 4 way valve Closed in cooling mode and open in heating mode Electronic expansion valve The opening is of the valve is regulated according to the discharge air temperature of compressor used to regulating refrigerant flow High Pressure Switch When the discharge pressure of comp...

Страница 18: ...nse to heating mode Only response to cooling mode ORANGE ORANGE HEAT1 SV6 BLUE BLUE 0 13 14 15 19 16 18 17 12 NO NO 20 21 L0 L1 L2 L5 L9 L8 L4 L7 Malfunction Code For Outdoor Unit E 9 unit and CODE PART NAME Speed difference 15Hz protection between the front and the back clock Speed difference 15Hz protection between the real and the setting speed Compressor discharge temperature sensor malfunctio...

Страница 19: ...Central control monitor CCM Computer in broken line table users can purchase the Central control montior when necessary Single phase indoor unit W i r e cont r ol l er The r eser ved wi r e cont r ol f unct i on i si ndi cat ed i n br oken l i ne t abl e user scan pur chase t he wi r e cont r ol l erwhen necessar y To wi r e cont r ol l er Display board WHITE BLUE BLACK P Q X Y E YELLOW GRAY To ou...

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Страница 30: ...4 14 39 8 5 2 20 10 2 2 80 11 8 3 46 12 6 3 82 13 4 4 20 13 8 4 25 14 1 4 28 41 8 5 2 28 10 2 2 92 11 8 3 59 12 6 3 92 13 4 4 22 13 7 4 36 14 0 4 38 43 8 5 2 39 10 2 3 05 11 8 3 71 12 6 4 02 13 4 4 31 13 6 4 41 13 8 4 45 45 8 5 2 54 10 2 3 20 11 8 3 86 12 6 4 16 13 4 4 43 13 5 4 46 13 6 4 51 80 5 7 5 0 97 9 0 1 14 10 4 1 35 11 2 1 44 12 0 1 55 13 4 1 79 14 9 2 04 2 7 5 0 98 9 0 1 16 10 4 1 36 11 2...

Страница 31: ...7 3 23 13 0 3 75 39 6 6 1 61 7 9 1 99 9 2 2 43 9 8 2 66 10 4 2 91 11 7 3 43 13 0 4 00 41 6 6 1 68 7 9 2 06 9 2 2 50 9 8 2 75 10 4 3 00 11 7 3 57 13 0 4 17 43 6 6 1 81 7 9 2 21 9 2 2 60 9 8 2 90 10 4 3 08 11 7 3 70 13 0 4 30 45 6 6 1 85 7 9 2 25 9 2 2 66 9 8 2 95 10 4 3 24 11 7 3 90 13 0 4 47 60 5 5 6 0 74 6 8 0 85 7 8 1 00 8 4 1 06 9 0 1 15 10 0 1 29 11 2 1 48 2 5 6 0 74 6 8 0 87 7 8 1 01 8 4 1 08...

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Страница 33: ...80 4 49 12 80 4 58 12 75 4 73 7 7 6 13 36 4 21 13 36 4 36 13 31 4 51 13 31 4 59 13 26 4 66 13 26 4 81 5 5 6 14 07 4 34 14 02 4 49 13 97 4 63 13 97 4 71 13 97 4 78 13 92 4 92 3 3 7 14 73 4 47 14 73 4 61 14 68 4 75 14 68 4 81 14 63 4 89 14 63 5 02 0 0 7 15 90 4 66 15 90 4 79 15 85 4 91 15 85 4 98 15 80 5 04 15 80 5 17 3 2 2 17 17 4 84 17 12 4 95 17 12 5 07 17 07 5 13 17 07 5 19 16 71 5 16 5 4 1 18 0...

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Страница 39: ...4 13 4 3 81 14 9 4 44 39 7 5 1 90 9 0 2 36 10 5 2 87 11 2 3 15 11 9 3 44 13 4 4 05 14 9 4 73 41 7 5 1 98 9 0 2 44 10 5 2 96 11 2 3 25 11 9 3 54 13 4 4 22 14 9 4 93 43 7 5 2 14 9 0 2 61 10 5 3 08 11 2 3 43 11 9 3 65 13 4 4 37 14 9 5 09 45 7 5 2 19 9 0 2 66 10 5 3 14 11 2 3 48 11 9 3 83 13 4 4 61 14 9 5 28 60 5 6 5 0 87 7 7 1 01 9 0 1 17 9 6 1 25 10 2 1 35 11 5 1 51 12 7 1 74 2 6 5 0 87 7 7 1 02 9 0...

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Страница 43: ... 67 7 7 6 11 83 4 73 11 17 4 42 10 50 4 11 10 17 3 96 9 83 3 81 9 17 3 52 5 5 6 11 83 4 46 11 17 4 17 10 50 3 88 10 17 3 74 9 83 3 60 9 17 3 33 3 3 7 11 83 4 21 11 17 3 94 10 50 3 67 10 17 3 54 9 83 3 41 9 17 3 15 0 0 7 11 83 3 85 11 17 3 60 10 50 3 36 10 17 3 25 9 83 3 12 9 17 2 89 3 2 2 11 83 3 53 11 17 3 31 10 50 3 09 10 17 2 98 9 83 2 88 9 17 2 67 5 4 1 11 83 3 34 11 17 3 13 10 50 2 93 10 17 2...

Страница 44: ... 15 77 2 0 1 2 0 9 60 208 230 187 253 37 5 31 40 15 77 2 0 1 2 0 9 MDV 140W DON1 50 220 240 198 264 37 5 31 40 15 77 2 0 1 2 0 9 60 208 230 187 253 37 5 31 40 15 77 2 0 1 2 0 9 MDV 160W DON1 50 220 240 198 264 37 5 31 40 15 77 2 0 1 2 0 9 60 208 230 187 253 37 5 31 40 15 77 2 0 1 2 0 9 Remark Mop Total Over current Amps A MFA Max Fuse Amps A RLA Rated Locked Amps A OFM Outdoor Fan Motor FLA Full L...

Страница 45: ...R410A All DC Inverter Mini VRF MCAC VTSM 2016 02 42 Specifications Performance 9 Sound Levels Model Noise level dB A Height m MDV 120W DON1 57 1 2 MDV 140W DON1 57 1 2 MDV 160W DON1 57 1 2 1m H ...

Страница 46: ...C below 80 Heating mode 15 C 27 C 27 C Notes 1 If the unit is running outside the above condition protective device will start and even then the units take place abnormality running 2 These figures base on the operation conditions between indoor units and outdoor units Equivalent pipe length is 5m and height difference is 0m Precaution The indoor relative humidity should be lower than 80 If the ai...

Страница 47: ... 02 44 Installation Part 3 Installation 1 Precautions 45 2 Accessories 46 3 Outdoor Unit Installation 47 4 Piping Installation 49 5 Electric Wiring Installations 53 6 Outdoor Unit Wiring 56 7 Test Running 57 8 Precautions on Refrigerant Leakage 57 ...

Страница 48: ...ation may result in water leakage electric shock or fire Turn off the main power supply switch or breaker before attempting any electrical work Make sure all power switches are off Failure to do so may cause electric shock Connect the connecting cable correctly If the connecting cable is connected in a wrong way electric parts may be damaged When moving the air conditioner for the installation int...

Страница 49: ...the terminals Be sure to provide grounding Do not connect ground wires to gas pipes water pipes lightning rods or ground wires for telephone cables Conform to the regulations of the local electric company when wiring the power supply Inappropriate grounding may cause electric shock Do not install the air conditioner in a location subject to a risk of exposure to a combustible gas If a combustible ...

Страница 50: ...o not install the unit in a place full of machine oil Do not install the unit in a place full of sulphuric gas Do not install the unit in a place where high frequency radio waves are likely to be generated as from audio equipment welders and medical equipment 3 2 Installation space unit mm Please keep away from the following place or malfunction of the machine may be caused There is combustible ga...

Страница 51: ...front with rear sides All the pictures in this manual are for explanation purpose only They might be slightly different from the air conditioner you purchased depending on model The actual shape shall prevail 6 0 c m Fix with bolt 600 2000 300 2000 500 3000 3000 300 300 600 300 2000 Wall or obstacle Maintain channel Air outlet Air inlet Air inlet ...

Страница 52: ...e L shape metal plate otherwise cannot wiring Back out pipe Please wipe off the piping support rubber blanket beside the inner outlet pipe cover of the machine while back side getting out pipes Undersurface outlet pipe the knock out should from inside to outside and then piping and wiring through this Pay attention to the piping the fat connecting pipe should out from the largest hole otherwise th...

Страница 53: ...t Indoor Unit The first line Branch Pipe Outdoor unit Pipe Length from the nearest branch pipe equivalent length Maximum pipe equivalent length from the first line branch pipe Maximum pipe equivalent length Indoor Unit to Indoor Unit Drop Heihgt a A L2 L1 B C D E L3 L4 L5 b c d e f The second cennect methond Indoor unit Outdoor unit Drop HEIGHT between indoor unit and uutdoor unit Maximum pipe equ...

Страница 54: ...main pipe the branch pipe and the main pipe of indoor unit A B C D E Note The distance between the first branch to the last indoor unit is more than 15m choose the second connecting method The pipe between the indoor units to the closest branch must be less than 15m Table 1 Indoor unit branch pipes selection a f A Capacity of indoor units kW A kW Gas Side Φ Liquid Side Φ A 4 5 12 7 Flaring nut 6 4...

Страница 55: ...t Maximum Quantity of Indoor unit Total Capacity of Indoor unit 120 model 7 45 130 140 model 8 45 130 160 model 9 45 130 If ODU connect more than one IDU the capacity of each IDU should be not more than 8kW for refrigerant uniform distribution When capacity of indoor unit greater than the sum of 100 capacity of indoor unit will be attenuated When capacity of indoor unit greater than or equal to th...

Страница 56: ...ter of copper pipe Φ15 9mm the thickness of the insulating layer at least more than 20mm Please use attached heat insulating materials to do the heat insulation without clearance for the connecting parts of the indoor unit pipes 5 Electric Wiring Installations 5 1 Highlights of electrical installation 1 Please separately design the special power of indoor units and outdoor units 2 The power adopts...

Страница 57: ...ne is made of material the same as phase line the smallest sectional area of PE line should be in accordance with the regulation below Sectional area of core to phase lines mm Smallest sectional area of PE line mm S 16 S 16 S 35 16 S 35 S 2 5 3 Distribution highlights of distribution wiring 1 When distributing wiring select wirings with different colors for phase line zero line and protection eart...

Страница 58: ...ction signal wires and indoor unit outdoor unit connection signal wire are in the same system When power cord is parallel with signal wire please put them into separate wire distribution pipes and leave a proper distance Reference distance It is 300mm when current capacity of power cord is less than 10A or 500mm when 50A Indoor Power Supply Circuit Breaker Manual swtich Wire Distribution Box Indoo...

Страница 59: ...e Do not use a multi core cable Incorporate the outdoor unit and indoor unit connection wiring system and refrigerant pipe system for the same system The power supply electric leakage protectors and manual switches of the indoor units that connect to the same outdoor unit must be universal Use the same loop for the indoor unit power Connect to the same outdoor unit must be universal Use the same l...

Страница 60: ...itical thickness through follow steps and take necessary actions 1 Calculate the sum of the charge volume A kg Total Refrigerant volume of 10HP factory refrigerant volume super addition 2 Calculate the indoor cubage B m3 as the minimum cubage 3 Calculate the refrigerant thickness Counter measure against over high thickness 1 Install mechanical ventilator to reduce the refrigerant thickness under c...

Страница 61: ...ter Mini VRF MCAC VTSM 2016 02 58 Troubleshooting Part 4 Troubleshooting 1 PCB Ports Instructions 59 2 PCB Parts Instructions 60 3 Function Setting Dial Switches Instructions 61 4 Error Code Table 62 5 Troubleshooting 63 ...

Страница 62: ...put port of system low high pressure detect switch DC 0V 5V 9 CN51 Linear transformer output port AC 9 0V 10 5V AC 13 5V 15 5V 10 CN17 DC fan 1 port DC 380V 11 CN19 DC fan 2 port DC 380V 12 CN18 DC fan Power input DC 380V DC 15V 13 CN26 Linear transformer input port AC 220V 14 CN6 Port of PFC Control signal and Communication between main board and IPM board DC 0 12V 15 CN31 Load output port Hot ga...

Страница 63: ...arge temperature Actual value if it is more than one hundred it will be only display the hundreds digit and the tens digit 8 The surface tempertature of the radiator Actual value 9 EXV opening degree Actual Value Display value 8 10 Current value Actual value 11 Voltage AD value Actual value 12 T2 average temperature Actual value 13 Total quantities of the indoor units Actual value 14 The quantitie...

Страница 64: ...hes Instructions SW3 definition Priority mode SW4 definition Function setting Heating priority mode Factory default Cooling priority mode First running priority mode Only response to heating mode Only response to cooling mode 1 ON Auto addressing OFF Manual addressing 2 ON Cancel addressing OFF OFF ...

Страница 65: ...41 main board H4 3 times of L0 or L1 protection in 60 minutes P1 High pressure protection P2 Low pressure protection P3 Input current protection P4 Compressor discharge temperature protection P5 Condenser T3 high temperature protection P6 IPM module malfunction P8 Typhoon protection PE Evaporator high temperature protection PL Radiator temperature protection Reserved L0 Module malfunction L1 DC ge...

Страница 66: ...he IPM module LED display H0 Communication malfunction between main PCB chip and IR341 chip Whether the LED indicator on the drive board flash normally Replace the drive board NO Whether the signal wiring between the module board and drive board is connected normally Connect wire again NO YES Disconnect the communication wire between IPM module board and drive board And check the third fourth pin ...

Страница 67: ... 1 2 3 4 5 6 7 8 9 Capacity 100W 22 28 36 45 56 71 80 90 112 140 HP 0 8 1 0 1 2 1 6 2 0 2 5 3 0 3 2 4 0 5 0 For example LED displays E2 Communication malfunction between indoor unit chip and outdoor unit chip Check the communication wire sequence is correct or not Connect the wire again NO Check whether there is disconnection YES Replace NO Check whether the three cored shielded wire is used as th...

Страница 68: ...If the timer and warning lights are normally on that means the capacity code is 5 4 1 and the capacity of indoor unit is 71 100W 2 5HP 2 If the signal is weak connect a 120Ω resistor between P and Q of the farthest indoor unit or connect a 0 5 1 5uF capacitor between P and Q of outdoor unit Installation refers to the following picture Note Communication wires should be shield wire and indoor units...

Страница 69: ...ring resistance value of sensor find that T4 thermo bulb is earth continuity and further discover that the thermal cable of T4 sensor is punched by bolt as follows LED displays E4 Whether the wire body is broken PCB is disabled Pipe temperature T3 ambient temperature T4 sensor malfunction Connect the wire again YES NO Judge whether temperature sensor pin connects properly YES Connect again NO NO R...

Страница 70: ... 4 E5 Voltage protection malfunction for all models LED displays E5 Voltage protection malfunction Whether the input voltage is 180 260V NO Replace the filter board and check whether the unit can operate normally Check the power supply YES Replace the main PCB YES OK NO ...

Страница 71: ...DC fan wiring is correct or not NO Connect again YES O Check whether power source and voltage of DC fan are normal Check whether the voltage with black red terminal connected to the DC fan plug is 277 354V when standby 是 YES Check the Voltage between DC fan motor s white terminal and black terminal is 15V when standby NO Replace IPM module Replace the main PCB YES Whether the outdoor fan will work...

Страница 72: ...n normal value compressor makes noise pressure meter do not display steady LED displays E7 Discharge sensor malfunction Check whether discharge temperature sensor s head is inside the sleeve or its wiring is connected to the main PCB properly NO Connect again YES Check whether the discharged sensor is normal NO Replace discharge sensor YES Check the operation conditions of the unit meets the opera...

Страница 73: ...5 7 E9 EEPROM malfunction The malfunction may be caused by two reasons 1 The EEPROM is not inserted well 2 Outdoor main board is broken LED display E9 E0 EEPROM malfunction Replace outdoor main PCB Check whether the EEPROM is inserted well Insert the EEPROM well NO YES ...

Страница 74: ... higher than the unit s operating condition when heating mode YES Belongs to system normal protection NO Check whether the refrigerant volume of the system is added according to the requirement and check if the refrigerant leaks YES Connect the pipe again check leakage insure the pressure add the refrigerant NO Check whether the condenser is blocked YES Rectify the pipe system Replace main PCB NO ...

Страница 75: ...gh pressure switch YES Check whether the cooling system operates normally Replace the main PCB NO Whether high pressure of the system is too high YES Stop the system NO Whether side air duct of outdoor unit meets the standard NO Rectify the air duct YES Whether the heat exchanger needs cleaning YES Clean it NO Whether the pipeline is blocked YES Rectify the pipeline Whether the throttle part is st...

Страница 76: ...m can work as normal YES NO Check whether the outdoor ambient temperature is too low YES Stop the unit NO Whether refrigerant system leaks YES Leakage detecting add nitrogen or refrigerant into the system si si will sound evidently if leaks heavily Use soap water the combination of water and detergent or electronic detector to detect if leaks slightly Whether the refrigerant pipe is blocked YES Re...

Страница 77: ...e is more than 30A Check cooling system is normal or not YES Check whether the outdoor ambient temperature is too high YES Stop the unit NO NO Check whether the outdoor unit ventilates well YES Make the outdoor unit ventilates well NO Whether the heat exchanger needs cleaning or not YES Clean heat exchanger NO If the refrigerant pipe is blocked or not YES Remove the refrigerant pipe and then use h...

Страница 78: ...re of the compressor Check whether the discharged temperature of the compressor is higher than 115 C NO Check whether the compressor discharged temperature sensor connects with PCB correctly according to the wiring diagram YES Check whether resistance of compressor discharged temperature sensor is correct or not NO Connect correctly again YES Replace outdoor PCB Whether the discharged temperature ...

Страница 79: ...enser temperature is higher than 62 degrees for 3 seconds NO Check whether the resistance of condenser temperature sensor is correct YES Replace the outdoor main PCB NO Replace the temperature sensor YES Whether outdoor temperature is too high higher than 43 degrees or not Replace outdoor PCB NO Whether heat exchanger needs cleaning NO If refrigerant pipe is blocked or not Clean heat exchanger YES...

Страница 80: ...rotection L8 frequency difference in one second more than 15Hz L9 frequency difference between the real and the setting frequency more than 15Hz L0 module protection L5 Zero speed protection L7 Phase sequence error P6 will disappear in one minute Then press the check button to find the specific error code when P6 disappears Check module and compressor Check power supply of module Check power suppl...

Страница 81: ...one of the above works replace the PCB Module check 1 DC voltage between P and N should be 296V to 324V 2 DC voltage between 1 and 2 should be 310V to 380V 3 First adjust multi meter to diode position put the red pen on the 1 point N terminal put black pen on the 3 or 4 or 5 point the value should be approximate 0 378 if the value is 0 the IPM is broken And then change the red pen to the 2 point P...

Страница 82: ...K control box A is malfunction then check the inverter module If the compressor could not start normally that means the compressor is malfunction the go to step 3 to check the compressor Step 3 Check the compressor Measure the resistance between each two of U V W terminals all the resistance should be the same and equal to 0 9 5 Ohms Fig A and Fig B Measure the resistance between each of U V W ter...

Страница 83: ...n fasten the wires If wires are OK replace the PCB 5 14 3 L2 troubleshooting Step 1 Check the DC voltage between P and N terminal the normal value should be 310V 380V if the voltage is higher than 380V go to step 2 Step 2 Check the voltage between the capacitor the normal value should be 510V 30V or 310V 30V if not in the range then the PCB has malfunction it needs to be replaced Turn the measure ...

Страница 84: ...er average temperature of evaporator is higher than 63 degrees for 50 seconds or not NO Check whether the resistance of evaporator temperature sensor is correct YES Replace outdoor main PCB NO Replace temperature sensor YES If indoor temperature is too high or not exceeds the using range of the unit Replace outdoor main PCB NO Whether the heat exchanger needs cleaning NO Whether the refrigerant pi...

Страница 85: ...isplays P8 Typhoon protection YES Belongs to normal protection When air conditioner is standby or in malfunction stopping status check if there is strong air blows the fan phenomenon NO Check whether the fan motor is normal YES Replace outdoor main PCB or transfer board of the fan NO Replace fan motor ...

Страница 86: ... Midea Group Address Midea Headquarters Building 6 Midea Avenue Beijiao Shunde Foshan Guangdong China Postal code 528311 Tel 86 757 26338346 Fax 86 757 22390205 cac midea com global midea com Note Product specifications change from time to time as product improvements and developments are released and may vary from those in this document ...

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Midea MDV-120W/DON1, Техническое и сервисное руководство

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