Friedrich MD24Y3J Svc Manual
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Friedrich MD24Y3J Svc Manual

Single zone air conditioner
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Single Zone Air Conditioner
SVC MANUAL(General)
CAUTION
Before Servicing the unit, read the safety
precautions in General SVC manual.
Only for authorized service personnel.
960-914-06

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Summary of Contents for Friedrich MD24Y3J

  • Page 1 Single Zone Air Conditioner SVC MANUAL(General) CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel. 960-914-06...

  • Page 2: Table Of Contents

    Air Conditioner Service Manual TABLE OF CONTENTS Part 1 General Information ......................3 1. Safety Precautions......................4 2. Model Line Up........................7 3. Nomenclature ........................8 Part 2 Functions & Controls......................10 1. List of Functions & Accessory...................11 2. Air flow ........................14 3. Air purifying.........................16 4.

  • Page 3: Part 1 General Information

    Part 1 General Information 1. Safety Precautions ......................4 2. Model Line Up ........................7 3. Nomenclature........................8 - 3 - Only for training and service purposes...

  • Page 4: Safety Precautions

    1. Safety Precautions 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. The seriousness is classified by the follow- ing indications.
  • Page 5 Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock. Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc.
  • Page 6 1.2 Inspections after Repair Check to see if the power cable is not dirty or loose. If the plug is dusty or loose it can cause an electrical shock or fire. Do not use a spliced power cable or extension cable, or share the same power outlet with other electrical appliances.

  • Page 7: Model Line Up

    2. Model Line Up 2.1 Indoor units Capacity Index[kBtu/h] Chassis Category Name MD24Y3J Ceiling Concealed Duct MD36Y3J High Static Pressure MC24Y3J Ceiling 4way Cassette MC36Y3J 2.2 Outdoor units DC Inverter MR24UY3J MR36UY3J No. of connectable indoor units Total Capacity index of...
  • Page 8 3. Blank - 8 - Only for training and service purposes...

  • Page 9: Nomenclature

    2.3 Nomenclature Installation Type M : Multi Zone Marketing Model Electrical rating 1 : 115V, 1Ø, 60Hz 3 : 230V, 1Ø, 60Hz Refrigeration Cycle C : Cool Only Y : Heat Pump Application Empty : Single U : Universal D : Dual Zone T : Tri-Zone Q : Quad Zone Capacity...

  • Page 10: Part 2 Functions & Controls

    Part 2 Functions & Controls 1. List of Functions & Accessory ..................11 1. Ceiling Concealed Duct Indoor..................11 2. 4-Way Ceiling Cassette Indoor ..................12 3. Outdoor .........................13 2. Air flow ...........................14 2.1 Auto swing (left & right) ....................14 2.2 Auto swing (up & down) ....................14 2.3 Chaos swing (up/down)....................14 2.4 Air flow step.........................15 2.5 Chaos wind (auto wind)....................15...

  • Page 11: List Of Functions & Accessory

    1. List of Functions & Accessory 1. Ceiling Concealed Duct Indoor Category Functions Remark Air supply outlet Airflow direction control (left & right) Airflow direction control (up & down) Auto swing (left & right) Air flow Auto swing (up & down) Airflow steps (fan/cool/heat) 3 / 3 / 3 Chaos wind(auto wind)

  • Page 12: Way Ceiling Cassette Indoor

    2. 4-Way Ceiling Cassette Indoor Category Function Remark Air supply outlet Airflow direction control(left & right) Airflow direction control(up & down) Auto Auto swing(left & right) Auto swing(up & down) Air flow Airflow steps(fan/cool/heat) 4 / 5 / 4 Natural swing Natural wind(auto wind) Surge cool(Power wind) Swirl wind...

  • Page 13: Outdoor

    3. Outdoor Category Functions MR24UY3J MR36UY3J Defrost / Deicing High pressure switch Low pressure switch Phase protection Reliability Restart delay (3-minutes) Release Control Self diagnosis Soft start Test function Convenience Night Silent Operation O (Logical operation) O (Logical operation) Low Ambient Kit - 13 - Only for training and service purposes...

  • Page 14: Air Flow

    2. Air flow 2.1 Auto swing (left & right) • By the horizontal airflow direction control key input, the left/right louver automatically operates with the auto swing or it is fixed to the desired direction. Left Right 110° ~ 120° 2.2 Auto swing (up &...

  • Page 15: Air Flow Step

    2.4 Air flow step Step Discription • Indoor fan motor control have 6 steps. Very low, In heating mode • Air volume is controlled "SH", "H", "Med", Low" by remote controller. • "LL" step is selected automatically in Hot start operation. High Super high Auto...

  • Page 16: Air Purifying

    3. Reserved (Blank) - 16 - Only for training and service purposes...

  • Page 17: Installation Functions

    4. Installation Functions 4.1 E.S.P. (External Static Pressure) Setting (DUCT) This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier. • If you set ESP incorrectly, the air conditioner may malfunction. •...
  • Page 18 E.S.P. setting value (reference) Table 1 Static Pressure(Pa) Capacity Step 24.5 39.2 58.8 78.4 Setting Value HIGH 1080 1190 1260 1050 1150 1230 1020 1120 1200 HIGH 1130 1030 1090 1150 1020 1090 1000 [ Notes ] 1. To get the desired Airflow & E.S.P. combination from the table set the matching value from the table. Value other than that in table will not give the combinations of airflow &...

  • Page 19: External Static Pressure) Setting (Cassette)

    4.2 E.S.P. (External Static Pressure) Setting (Cassette) This function is applied to only duct type. Setting this in other cases will cause malfunction. Press button for 4 seconds to enter the installer setting mode until timer segment displays “01:01”. If pressing button repeatedly, it moves to static pressure selection menu as picture below.
  • Page 20 This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier. • If you set ESP incorrectly, the air conditioner may malfunction. • This setting must be carried out by a certificated-technician. If pressing button long for 3 seconds, it enters into remote controller setter setup mode.

  • Page 21: Reliability

    5. Reliability 5.1 Hot start • When heating is started, the indoor fan is stopped or very slow to prevent the cold air carry out • When the temp. of heat exchanger reach 30°C(model by model), indoor fan is started. 5.2 Self-diagnosis Function •...

  • Page 22: Convenience Functions & Controls

    6. Convenience Functions & Controls 6.1 Cooling & heating Operations 6.1.1 Cooling Mode • Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions. • If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 seconds.

  • Page 23: Auto Cleaning Operation

    6.2 Auto cleaning operation • Function used to perform Self Cleaning to prevent the Unit from fungus and bad odor. • Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next opera- tion.

  • Page 24: Child Lock Function

    6.5 Child Lock Function It is the function to use preventing children or others from careless using. During the operation, when pressing the button and button for approx. 3 seconds, SPEED the ‘Child Lock’ Function can be used. - At the time of initial setting of the ‘Child Lock’, the ‘CL’...

  • Page 25: Forced Operation

    6.6 Forced operation • To operate the appliance by force in case when the remote control is lost, the forced operation selection switch is on the main unit of the appliance, and operate the appliance in the standard conditions. • The operating condition is set according to the outdoor temp. and intake air temperature as follows. Setting speed of Indoor temp.

  • Page 26: Group Control

    6.7 Group Control 1. When installing more than 2 units of air conditioner to one wired remote controller, please connect as the right figure. Signal wire • If it is not event communication indoor unit, set the unit as slave. •...

  • Page 27: Sleep Timer Operation

    6.8 Sleep Timer Operation • When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops. • While the appliance is on pause, the sleep timer mode cannot be input. •...

  • Page 28: Weekly Program

    6.10 Weekly Program You can set the daily reservation in weekly unit. Weekly reservation keeps operating until before you cancel it once you setup Please move to reservation setup mode by pressing reservation button. ❈ You can setup two weekly reservations for one day, and up to fourteen reservations for a week.
  • Page 29 Please move to 'AM/PM' setup part of turning off by using button. - AM/PM setup is identical with turning on time setup. Please move to 'hour' setup part of turning off by using Right button. - It is the part to reserve the time at which air-conditioner is turned off.

  • Page 30: Two Thermistor Control

    6.11 Two Thermistor Control This is the function to select the temperature sensor to judge the room temperature. OPER When pressing the button and MODE button simultaneously for more than 3 seconds, the system will be entered into the installer setting mode. - After entering into the installer setting mode, select the thermistor sensor setting code value by pressing the...
  • Page 31 This is the function to select the temperature sensor to judge the room temperature. If pressing button long for 3 seconds, it enters into remote controller setter setup mode. - If pressing once shortly, it enters into user setup mode. Please press more than 3 seconds for sure.

  • Page 32: Special Function & Kit

    7. Special Function 7.1 Low Ambient control • This Function is for cooling operating in outdoor low temperature . • If outdoor temperature drops below certain temperature, liquid back is prevented by reducing outdoor fan speed. • It can prevent frosting of evaporator and keep cooling operation Outdoor pipe T2°C T1°C...
  • Page 33 - 33 - Only for training and service purposes...
  • Page 34 - 34 - Only for training and service purposes...

  • Page 35: Part 3 Basic Control

    Part 3 Basic Control 1. Normal operation......................36 2 Compressor control ......................36 3. EEV( Electronic Expansion Valve) control ..............36 - 35 - Only for training and service purposes...

  • Page 36: Normal Operation

    1. Normal operation Basic principle is to control the rpm of the motor by changing the working frequency of the compressor. Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM (intelligent power module).

  • Page 37: Part 4 Trouble Shooting

    Part 4 Trouble Shooting 1. Self-diagnosis Function....................38 1.1 Error Indicator (Indoor)....................38 1.2 Error Indicator (Outdoor) .....................39 2. Pump Down........................40 3. Evacuation ........................41 4. Gas Charging ........................42 5. Cycle Part ........................43 6. Electronic Parts ......................44 6.1 The Product doesn't operate at all................44 6.2 The Product doesn't operate with the remote controller ..........45 6.3 The Compressor/Outdoor Fan are don't operate ............46 6.4 When indoor Fan does not operate................47...

  • Page 38: Self-Diagnosis Function

    1. Self-diagnosis Function 1.1 Error Indicator (Indoor) Ceiling Cassette Type Display 10 degrees 1 degrees The number of times to blink = Error code Ex) Error 03 (Remote controller error) 3 Times 3 Times 3 Times LED02G LED1 (GREEN) 2 Sec. 2 Sec.

  • Page 39: Error Indicator (Outdoor)

    1.2 Error Indicator (Outdoor) 2 Times 2 Times 2 Times Outdoor Error LED01G (RED) Ex) Error 21 (DC Peack) 1 Sec. 1 Sec. 1 Sec. 1 Time 1 Time 1 Time LED02G (GREEN) 2 Sec. 2 Sec. MR24UY3J MR36UY3J LED 1 LED 2 Indoor Error Code...

  • Page 40: Pump Down

    2. Pump Down Setting Procedure 1) Set the Dip Switch as follow after shutting the power source down. MR36UY3J MR24UY3J 2) Reset the power. 3) Red LED and Green LED of PCB lights during work. (The indoor unit is operated by force.) 4) If operation is done, Red LED will be turned off.

  • Page 41: Evacuation (All Amount Of Refrigerant Leaked)

    3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump Vacuum Gage OPEN OPEN • Procedure (1) Connect the vacuum pump to the center hose (4) Disconnect the charge hose from the vacuum of charge set center hose pump.

  • Page 42: Gas Charging (After Evacuation)

    4. Gas Charging (After Evacuation) Liquid side Indoor unit Open Outdoor unit 3-Way valve Gas side Open 3-Way valve Check valve Charging cylinder Vacuum Gage OPEN • Procedure (1) Connect the charge hose to the charging This is different from previous procedures. cylinder.

  • Page 43: Cycle Part

    5. Cycle Part Trouble analysis 1. Check temperature difference between intake and discharge air, and check for the operating current too. Case Symptom Supposed Caused Temp. difference : approx. 0°C All amount of refrigerant leaked out. Case 1 Current : less than 80% of rated current Check refrigeration cycle.

  • Page 44: Electronic Parts

    6. Electronic Parts 6.1 The Product doesn’ t operate at all Turn off the main power and wait for 10 seconds. Turn on the main power again. Operating condition of Micom is O.K. A "Beeping" sound is made from the indoor unit * Check, Remote controller &...

  • Page 45: The Product Doesn't Operate With The Remote Controller

    6.2 The Product doesn't operate with the remote controller Turn on the main power A "Beeping" sound is made * Refer to 10.1 from the indoor unit * Check the voltage of power (AC208V/AC230V, 60Hz). Is it possible to turn on the unit by ON/OFF button on display? Is the remote controller * When the mark (...

  • Page 46: The Compressor/Outdoor Fan Are Don't Operate

    6.3 The Compressor/Outdoor Fan are don't operate Turn on the main power. Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least. When in air circulation mode, compressor/outdoor fan is stopped. Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.) When the sensor circuit for Indoor temperature and connector are in bad connection or are...

  • Page 47: When Indoor Fan Does Not Operate

    6.4 When indoor Fan does not operate. Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. Check the Fuse(AC250V, T2A). Check the related circuit of indoor Fan Motor. • The pin No. of micom and the part for driving SSR.(Q01M) •...

  • Page 48: When The Louver Does Not Operate

    6.5 When the louver does not operate. • Confirm that the vertical louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the vertical louver with hands ⇒ Normal • Check the connecting condition of CN-U/D or CN0L/R Connector •...

  • Page 49: Troubleshooting Indoor Error

    6.6 Troubleshooting Indoor Error Display Title Cause of error Check point & Normal condition code • Connector connection error Normal resistor : 10KΩ/ at 25˚C (Unplugged) Indoor air sensor • Faulty PCB Normal voltage : 2.5Vdc / at 25˚C(Plugged) • Faulty sensor (Open / Short) Refer to sensor resistance table.
  • Page 50 Display Title Cause of error Check point & Normal condition code • Connector connection error • Connection of wire Communication Error • Faulty PCB / Remote • Main PCB Volt. DC12V (Wired remote controller) controller • Noise interference • Connection wire break Check Flow Chart Check the wire connection(Open /...
  • Page 51 Display Title Cause of error Check point & Normal condition code • The connection of wire (Drain pump/ Float switch) • Float switch open. • Drain pump power input. (230V) Drain pump (Normal : short) • Drain tube installation. / Float switch •...
  • Page 52 Display Title Cause of error Check point & Normal condition code EEPROM • Check the poor soldering. • Check sum error Check sum (Indoor) • Check the PCB Connection. Check Flow Chart (CH09) Check the the connection port. Is it normal ? Correct connection Change Option PCB - 52 -...
  • Page 53 Display Title Cause of error Check point & Normal condition code Indoor BLDC Fan Motor The Fan is not operated Check the Indoor fan locking Lock properly White Yellow Blue Black Red Fan motor connector Tester Check Point Check the PCB during the Power on 1.
  • Page 54 Display Title Cause of error Check point & Normal condition code • The connector for trans- mission is disconnected. • The connecting wires • Check power input AC 230V. (Outdoor, Indoor) are misconnected. • Check connector for transmission Communication • The communication line •...

  • Page 55: Troubleshooting Outdoor Error

    6.7 Troubleshooting Outdoor Error Display Title Cause of error Check point & Normal condition code • An instant over current in the U,V,W phase - Comp lock • Instant over current - The abnormal connection of U,V,W DC PEAK • Over Rated current •...
  • Page 56 n AUUW24GD2 [MR24UY3J] 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out V, V, W COMP connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5.
  • Page 57 n AUUW36GD2 [MR36UY3J] AC(N)-BLUE AC(L)-BROWN U,V,W CONNECTOR 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out AC(L), AC(N) connectors and U,V,W COMP Connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5.
  • Page 58 Display Title Cause of error Check point & Normal condition code • Malfunction of compressor • Blocking of pipe • Input Over Current Max. C/T • Low voltage input • Refrigerant, pipe length, blocked, … WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
  • Page 59 Check Point 1. Check the power source.(230V ±15%) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (LUU247HV - Check output the CT Sensor : DC 2.5±0.2V) LUU367HV / LUU427HV - Check output pin 2.3 of the CT Sensor : DC 2.5±0.2V * AUUW24GD2 [MR24UY3J] IN/I...
  • Page 60 Display Title Cause of error Check point & Normal condition code • DC Link Voltage is • Check CN_(L), CN_(N) Connection above 420Vdc DC Link High / Low Volt • Check Input Voltage • DC Link Voltage is • Check PCB DC Link voltage sensor parts below 140Vdc WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 61 Check Point 1. Check the WCN_P(L),P(N) Connection condition at the Main PCB.(Refer to outdoor wiring diagram) 2. Check the DC Link voltage at not operating(280V↑) 3. Check the DC Link voltage at Comp operating(340V↑) 4. Check DC Link Sensing Signal :2.4~2.8V (Refer the Picture) * AUUW24GD2 [MR24UY3J] IN/I Black...
  • Page 62 AUUW36GD2 [MR36UY3J] - 62 - Only for training and service purposes...
  • Page 63 Display Title Cause of error Check point & Normal condition code • Abnormal Input voltage • Check the power source. Input voltage (140Vac , 300Vac) • Check the components. n Error Diagnosis and Countermeasure Flow Chart Is input voltage normal ? Check L~N Voltage is 230V±15% Is Inverter PCB Normal? Replace inverter PCB assembly...
  • Page 64 AUUW24GD2 [MR24UY3J] IN/I Black <CT Sensing Check Point> AUUW36GD2 [MR36UY3J] INPUT(V) < Input Voltage Sensing Check Point > < Inverter PCB> - 64 - Only for training and service purposes...
  • Page 65 Display Title Cause of error Check point & Normal condition code • Check the connection of comp wire “U,V,W” DC Compressor • Compressor • Malfunction of compressor Position Starting fail error • Check the component of “IPM”, detection parts. WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 66 AUUW36GD2 [MR36UY3J] - 66 - Only for training and service purposes...
  • Page 67 Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation damage/Motor Inverter PCB input damage) AC Input Instant over current is over100A(peak) 3. Input voltage abnormal (L,N) Current Error for 2us 4.
  • Page 68 * AUUW24GD2 [MR24UY3J] <Short Check Point> * AUUW36GD2 [MR36UY3J] <Short Check Point> - 68 - Only for training and service purposes...
  • Page 69 Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. over- charge) Inverter compressor over Inverter compressor input 2. Compressor damage(Insulation damage/Motor current current is over 30A damage) 3. Input voltage low 4. ODU inverter PCB assembly damage WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 70 Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint/ screened/ flow High temperature in • Refrigerant leakage structure Discharge pipe of the (insufficient) • Check refrigerant leakage inverter compressor •...
  • Page 71 Display Title Cause of error Check point & Normal condition code • Defective low pressure sensor • Defective outdoor/indoor unit fan • Refrigerant shortage/leakage • Deformation because of damage of refrigerant pipe • Defective indoor / outdoor unit EEV Excessive decrease of low Low Presser Error •...
  • Page 72 Display Title Cause of error Check point & Normal condition code Transmission Error Communication Error 1. Micom defect/Circuit defect Between (PFC Micom ’ 2. Different Micom S/W Version Between PFC Micom INV Micom) and INV Micom. 3. ODU inverter PCB assembly damage n Error Diagnosis and Countermeasure Flow Chart Is PFC Micom &...
  • Page 73 Display Title Cause of error Check point & Normal condition code • Malfunction of current detection circuit. (Open / Short) • Initial current error • Check CT Sensor output voltage : Sensor Error 2.5Vdc ±5% WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
  • Page 74 AUUW24GD2 [MR24UY3J] AUUW24GD2 [MR24UY3J] IN/I IN/I Black Black <CT Sensing Check Point> <CT Sensing Check Point> AUUW36GD2 [MR36UY3J] AUUW36GD2 [MR36UY3J] < Inverter PCB> < Inverter PCB> <CT Sensing Check Point> <CT Sensing Check Point> - 74 - Only for training and service purposes...
  • Page 75 Display Title Cause of error Check point & Normal condition code • Open / Short 1. Bad connection of thermistor connector D-pipe sensor (Inverter) • Soldered poorly 2. Defect of thermistor connector (Open/Short) • Internal circuit error 3. Defect of outdoor PCB •...
  • Page 76 Display Title Cause of error Check point & Normal condition code • Bad connection of connector PCB • Bad connection high pressure connector Sensor error of high Abnormal value of sensor • Defect of high pressure connector (Open/Short) pressure (Open/Short) •...
  • Page 77 Display Title Cause of error Check point & Normal condition code • Power input AC 230V. (Outdoor, Indoor) • The connector for transmission is disconnected. Title • The connecting wires are misconnected. • Communication poorly Communication • The communication line is shorted at GND. (Indoor ’...
  • Page 78 Display Title Cause of error Check point & Normal condition code 1. EEPROM contact defect/wrong insertion Inverter PCB & Main EEPROM Access error 2. Different EEPROM Version EEPROM check sum error and Check SUM error 3. ODU Inverter & Main PCB assembly damage WARNING Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 79 * AUUW36GD2 [MR36UY3J] EEPROM - 79 - Only for training and service purposes...
  • Page 80 Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint / screened / flow • Outdoor unit heat structure High temperature in out- exchanger contaminated • Check if refrigerant overcharged door Cond.
  • Page 81 Display Title Cause of error Check point & Normal condition code 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condi- Inverter PCB heatsink Heatsink High error tion abnormal temperature is over 85°C 3. Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 82 * AUUW24GD2 [MR24UY3J] PFCM: Measuring resistance between No.19,20 pin * AUUW36GD2 [MR36UY3J] Ω - 82 - Only for training and service purposes...
  • Page 83 Display Title Cause of error Check point & Normal condition code 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble Inverter PCB heatsink condition abnormal Heatsink Sensor error sensor is open or short 3. Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 84 * AUUW24GD2 [MR24UY3J] PFCM: Measuring resistance between No.19,20 pin * AUUW36GD2 [MR36UY3J] Ω - 84 - Only for training and service purposes...
  • Page 85 Display Title Cause of error Check point & Normal condition code 1. ODU fan locking Fan RPM is 10RPM or 2. Heatsink assembly of INV PCB assemble condi- less for 5 sec. when ODU tion abnormal Fan Lock Error fan starts or 40 RPM or 3.
  • Page 86 AUUW24GD2 [MR24UY3J] Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester <Main PCB> AUUW36GD2 [MR36UY3J] - 86 - Only for training and service purposes...
  • Page 87 Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage AC input instant over cur- Inverter PCB input power (Insulation damage/Motor damage) rent error current is over 48A(peak) 3. Input voltage abnormal (L, N) (Matter of software) for 2ms 4.
  • Page 88 * AUUW24GD2 [MR24UY3J] < Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 88 - Only for training and service purposes...
  • Page 89 AUUW36GD2 [MR36UY3J] AUUW36GD2 [MR36UY3J] < Input Power Source Check Point > < Input Power Source Check Point > - 89 - Only for training and service purposes...
  • Page 90 P/No : MFL62542027...

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