Multi Zone Air Conditioner SVC MANUAL(General) CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.
Air Conditioner Service Manual CONTENTS Part 1 General Information.........................................................................................................2 1. Safety Precautions........................................................................................................3 2. Model Line Up................................................................................................................6 3. Nomenclature .................................................................
Part 1 General Information 1. Safety Precautions ............................................................................................................3 2. Model Line Up .....................................................................................................................6 3. Nomenclature......................................................................................................................
Part 1 General Information 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 following indications. This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to properties only. n Meanings of symbols used in this manual are as shown below.
Part 1 General Information 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. Indoor/outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals.
Part 1 General Information 1.2 Inspections after Repair Check to see if the power cable plug is not dirty or loose. If the plug is dust or loose it can cause an electrical shock or fire. Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances. otherwise, it can cause an electrical shock, excessive heat generation or fire. Do not insert hands or other objects through the air inlet or outlet while the product is operating.
Part 1 General Information 2. Model Line Up 2.1 Indoor units Category 2.6 (9) Model names Capacity, kW(kBtu/h Class) 3.5 (12) USNW093B4B0 [MW09Y3J] USNW093B4B0 [MW09Y3J] Chassis SB 5.3 (18) Wall mounted ASNW183C4B0 [MW18Y3J] SC AMNW12GTRA0 [MC12Y3JM] TR Ceiling cassette 4-way AMNW18GTQA0 [MC18Y3JM] TQ Low Ceiling static concealed pressure duct (Slim) AMNW12GB1A0 [MD12Y3JM] B1 AMNW18GB2A0 [MD18Y3JM] B2 2.2 Outdoor units Model Name No. of connectable indoor units (Min. ~ Max.
Part 1 General Information 3. Nomenclature 3.
Part 1 General Information 3.2 Outdoor units A4U W 36 3 F A 2 Serial number Function A : Basic Multi type F : Free joint multi type Electrical rating 3 : 208/230V, 1Ø, 60Hz G : 220-240V, 1Ø, 50Hz 208/230V, 1Ø, 60Hz Cooling/heating capacity Ex) 36,000 Btu/h Class '36' Model type W : DC inverter heat pump Indicates that this is multi system outdoor unit using R410A Ex) A4U : Connectable max. 4 indoor units 3.
Part 2 Functions & Controls 1. List of Functions & Controls ........................................................................................10 1.1 List of Function (Indoor) ..............................................................................................10 1.2 List of Function (Outdoor)............................................................................................11 2. Air flow .................................................................................................
Part 2 Functions & Controls 1. List of Functions & Controls 1.
Part 2 Functions & Controls 1.
Part 2 Functions & Controls 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 & down) • By the auto swing key input, the upper/lower vane automatically operates with the auto swing or it is fixed to the desired direction. Close 110° ~ 120° Open 2.
Part 2 Functions & Controls 2.4 Air flow step • Indoor fan motor control have 6 steps. • Air volume is controlled "SH", "H", "Med", Low" by remote controller. • "LL" step is selected automatically in Hot start operation. Step Discription LL L M H SH Auto Very low, In heating mode Low Med High Super high Chaos wind 2.5 Chaos wind (auto wind) • When "Auto" step selected and then operated, the high, medium, or low speed of the airflow mode is operated for 2~15 sec. randomly by the Chaos Simulation 2.
Part 2 Functions & Controls 3. Installation Functions 3.1 How to Set E.S.P. on the remote controller? 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.
Part 2 Functions & Controls E.S.P. setting value (reference) Static pressure(mmAq(in.Aq)) Model name 0(0.0) 1(0.04) Step(Hi/Mid/Lo) 2(0.08) 3(0.12) 4(0.16) Setting value 9.5 CMM(336CFM) 82 90 99 109 118 8.5 CMM(300CFM) 75 84 94 104 114 7.5 CMM(265CFM) 69 77 88 99 110 15 CMM(530CFM) AMNW18GB2A0 13.5 CMM(477CFM) [MD18Y3JM] 11.5 CMM(406CFM) 90 97 105 114 122 82 90 99 109 119 75 84 93 103 114 AMNW12GB1A0 [MD12Y3JM] [ Notes ] 1. To get the desired Airflow & E.S.P.
Part 2 Functions & Controls 4. Reliability 4.1 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. 4.2 Self-diagnosis Function • The air conditioner installed can self-diagnosed its error status and then transmits the result to the central control.
Part 2 Functions & Controls 5. Convenience Functions & Controls 5.1 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 operation. • The function is easy to operate as it is accessed through the Remote controller. Unit Operation (Heat Pump) ON OFF ON Indoor Fan OFF Setting step OFF L Low ON Comp.
Part 2 Functions & Controls 5.2 Auto Operation (Fuzzy Operation) • When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since the operation off, the operation mode is selected. • When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air temp at that moment as follows.
Part 2 Functions & Controls 5.2.3 Fuzzy Operation for Heating • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3.5°F(3°C) or more above the setting temp, the compressor is turned off. When below the setting temp, the compressor is turned on. Compressor ON Temp ‘ Setting Temp Compressor OFF Temp ‘ Setting Temp + 3.5°F(3°C) • At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air temp at that time.
Part 2 Functions & Controls 5.4 Child Lock Function It is the function to use preventing children or others from careless using. the operation, when pressing the 1 During button and button for approx. 3 seconds, FAN SPEED the ‘Child Lock’ Function can be used. - At the time of initial setting of the ‘Child Lock’, the ‘CL’ Will be indicated approx. 3 seconds at the temperature Display section before resuming to the previous mode.
Part 2 Functions & Controls 5.6 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. • While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature increases by 1°C. After another 30 min elapse, it increases by 1°C again.
3. Control logic 1. Compressor ......................................................................................................................23 2. Step(frequency) control ...................................................................................................24 3. Reversing valve operaton................................................................................................25 4. Discharge pipe control................................................................................
Part 3 Control logic 1. Compressor 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). Switching speed of IPM defines the variable frequency input to the motor.
Part 3 Control logic 2. Step(frequency) control 2.1 Frequency control Frequency that corresponds to each rooms capacity will be determined according to the difference in the temperature of each room and the temperature set by the remote controller. There are various factors determining the frequency. 1. Indoor unit capacity value. 2. Temperature compensation factor 3.
Part 3 Control logic 3. Reversing valve operation 1. At the starting (outdoor is powered on,indoor is not) reversing valve continues OFF(cooling). 2. For the cooling and defrosting operation :valve OFF, for the heating operation :valve ON 3. Method of changing mode from heating to defrosting : As defrosting starts Inverter compressor Hz is lowered to 30Hz for 5 sec and the valve is OFF for the defrost mode. (refer “working process of each component in defrosting and returning to heating mode ”) 4 .
Part 3 Control logic 4. Discharge pipe control 1) There can be two situations a) Sensor is failed (error code for sensor failure will be generated) b) Abnormal high temperature discharge temperature (error code for high discharge will be generated) Both cases unit will stop. Compressor working 1. If discharge pipe temperature < T1 No limitation on compressor frequency 2.
Part 3 Control logic 5. Input Current Control 5.1 Function Controlling total current to protect power semiconductor devices from burn-out by the low current (including connecting mistake) and over current. Operating process 1. Detection : check the output DC voltage of Current Transformer(CT). 5.2 Operating process CT 1 detection : 1) If total current exceeds CT1+1 value, reduce inverter operation by 1 step. - Step down 5Hz(Option) from current step.
Part 3 Control logic 6. Outdoor Fan Control 6.1 Function Working of outdoor fan are different in different models. Some models are single fan some are two fan type. 6.2 Operating process Control logic of outdoor fan depends on outdoor temperature 1. AC motor fan control COOLING HEATING FAN1 OUTDOOR TEMP. Step_Fan + 1 41°C FAN2 FAN1 OUTDOOR TEMP.
Part 3 Control logic 7. Defrost Control 7.1 Function :These are about the control of compressor, fan of outdoor unit, reversing valve, LEV. 7.2 Starting to the defrosting operation A) Defrost operation will be start when all the conditions below are matched simultaneously Accumulation time of operation and the period after completion of defrost = 35min (Outdoor air temperature –3˚C) B) Outdoor piping temperature is below than –6 (Option)˚C for starting defrosting operation. 7.
Part 3 Control logic 8. LEV Control 8.1 Control of LEV opening 1. LEV openings have a controllable ranges 70 (option) to 460 (option) pulse in both condition of cooling and heating. 2. Products do not be operated before initializing of LEV when starting. 3. Time constant control period of LEV is every 2 minutes except below conditions. - Control LEV every 1 minutes for 10 minutes after starting.
Part 3 Control logic 8.2 Starting control 1) Only 1 LEV will be operate as below and others are closed fully. 2) Starting control does not use the time when the system operate with partial load after (example) after finishing starting control for 1 indoor unit, another indoor unit is ON additionally is operated with target opening of LEV. 3) The indoor units which are in the middle of starting control are continuing starting control with the opening of its opening.
Part 3 Control logic 9. Oil restoration operation 1) When the accumulated compressor running time is over 3 hr.(option), oil restoring operation is made for 3 minutes. If itʼs on the way of compressor starting,itʼs made after the starting. 2) Accumulated running time is cleared after the defrosting and oil restoring operation. Operating process : 1) Fully open all the indoorʼs LEV.
Part 3 Control logic 11. Heat sink control 11.1 Function : Power module failure protection by checking the temperature of heat sink. There is a temperature sensor for checking the heat sink temperature. 11.2 Heat sink sensor failure error Short Check : if temperature ≥130˚C Open Check : if temperature < - 30˚C System will go in self diagnosis (error 65) is displayed and product stops. 11.
4. Test Run 1. Check before Test Run.....................................................................................................35 2. Test Run Flow chart .........................................................................................................36 3. Test Running .....................................................................................................................
4. Test Run 1. Check before Test Run 1 Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly. Check liquid pipe and gas pipe valves are fully opened. 2 NOTE: Be sure to tighten caps. Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground. Do not operate in the case of 2.0 MΩ or less. 3 NOTE: Never carry out mega ohm check over terminal control board. Otherwise the control board may break.
4. Test Run 2. Test Run Flow chart START Test operation for indoor unit Operate the unit in cooling mode. Does Test operation start? No Refer to part4, 6 Electric part Yes Is cold air discharged for more than 3 minutes ? No Yes Is there any temperature difference between intake and discharged air? Refer to part4, 5 Cycle part No Yes Is the operating current normal ? No Yes Operation mode change to Heating mode Is hot air discharged ? After Hot Start * Check the load (In/Out Temp.
4. Test Run 3. Test Runing 3.1 PRECAUTIONS IN TEST RUN • The initial power supply must provide at least 90% of the rated voltage. Otherwise, the air conditioner should not be operated. CAUTION: ① For test run, carry out the cooling operation first even during winter season. If heating operation is carried out first, it leads to the trouble of compressor. ② Carry out the test run more than 5 minutes without stopping.
5. Trouble Shooting 1. Self-diagnosis Function.................................................................................................39 2. Pump Down.....................................................................................................................41 3. Evacuation ......................................................................................................................42 4. Gas Charging ...................................................................................
5. Trouble Shooting 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 Wall Mounted Type Display 1 degrees 10 degrees The number of times to blink = Error code Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
5. Trouble Shooting 1.3 Error Indicator (Outdoor) Outdoor Error Ex) Error 21 (DC Peack) 2 Times 2 Times 2 Times LED01G (RED) 1 Sec. 1 Sec. 1 Time 1 Sec. 1 Time 1 Time LED02G (GREEN) 2 Sec. Error Code 2 Sec. Contents LED01G/M LED02G/M (Red) (Green) Case of Error Outdoor Status 21 DC Peak (IPM Fault) 2times ◑ 1time ◑ Over Rated Current Off 22 CT 2(Max CT) 2times ◑ 2times ◑ Input Over Current Off 23 DC Link Low Volt.
5. Trouble Shooting 2. Pumping Down Liquid side Indoor unit 2-Way valve Open Outdoor unit Gas side Closed 3-Way valve Lo CLOSE CLOSE Purge the air • Procedure (1) Confirm that both the 2-way and 3-way valves are set to the open position. – Remove the valve stem caps and confirm that the valve stems are in the raised position. – Be sure to use a hexagonal wrench to operate the valve stems. (6) Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg/cm2g.
5. Trouble Shooting 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 Lo OPEN OPEN • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward 0.8Torr.
5. Trouble Shooting 4. Gas Charging (After Evacuation) Liquid side Indoor unit 3-Way valve Open Outdoor unit Gas side Open 3-Way valve Check valve Charging cylinder Lo (1) OPEN Vacuum Gage • Procedure (1) Connect the charge hose to the charging cylinder. – Connect the charge hose which you dis-connected from the vacuum pump to the valve at the bottom of the cylinder. – If you are using a gas cylinder, also use a scale and reverse the cylinder so that the system can be charged with liquid.
5. Trouble Shooting 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 Case 1 Temp. difference : approx. 0°C Current : less than 80% of rated current All amount of refrigerant leaked out. Check refrigeration cycle. Case 2 Temp. difference : approx. 8°C Current : less than 80% of rated current Refrigerant leakage Clog of refrigeration cycle Defective Compressor. Case 3 Temp.
5. Trouble Shooting 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. A "Beeping" sound is made from the indoor unit Yes Primarily, the operating condition of Micom is O.K. * Check, Remote controller & Receiver. * Check CN-DISP1, CN-DISP2 of indoor PCB No Check the voltage of power supply (AC230V, 50Hz) and check for the following : * The voltage of main power supply. * The voltage applied to the unit.
5. Trouble Shooting 6.2 The Product doesn't operate with the remote controller Turn on the main power A "Beeping" sound is made from the indoor unit No * Refer to 10.1 Yes Is it possible to turn on the unit by ON/OFF button on display? No * Check the voltage of power (AC230V, 50Hz). Yes Is the remote controller working properly? No * When the mark ( ) is displayed in LCD screen, replace battery. Yes * Check the contact point of CN-DISP 1, 2 connector & Re connector. * Check display P.C.
5. Trouble Shooting 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.
5. Trouble Shooting 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. 38 of micom and the part for driving SSR.(Q01M) • Check the related pattern. • Check the SSR. - SSR Open: Indoor Fan Motor never operate. - SSR short: Indoor Fan Motor always operates in case of ON or OFF. Turn on the main power Check the SSR high speed operation by remote control.
5. Trouble Shooting 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 • Check the soldering condition(on PCB) of CN-U/D or CN0L/R Connector Check the operating circuit of the vertical louver • Confirm that there is DC +12V between pin ¿ of CN-U/D, CN0L/R and GND.
5. Trouble Shooting 6.6 Troubleshooting Indoor Error Display code Title 01 Indoor air sensor • Open / Short • Soldered poorly • Internal circuit error Normal resistor : 10KΩ/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) 02 Indoor inlet pipe sensor • Open / Short • Soldered poorly • Internal circuit error Normal resistor : 5KΩ/ at 25°C (Unplugged) Normal voltage : 2.
5. Trouble Shooting Display code Title 03 Communication Wired R/C Cause of error Wired R/C 12V S • Open / Short • Wrong connection Indoor Unit GND 12V S • Connection of wire • Main PCB Volt. DC12V • Noise interference CN-REMO GND 12Vdc 12Vdc V V Check the Volt. Check point & Normal condition Check the Volt. Check Point 1. Check the wire connection. (Open / Short) ’ Repair the connection 2. Check the soldering state of connector. (Soldered poorly) ’ Repair or Change the PCB. 3.
5. Trouble Shooting Display code Title 04 Drain pump / Float switch Cause of error • Float switch Open. (Normal : short) Check point & Normal condition • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (220V) • Drain tube installation. • Indoor unit installation. (Inclination) CN Float CN-D/PUMP CN-Float 0Ω Ω Check the resistance Check Point 1. Check the wire connection. (Open, Soldered poorly) ’ Repair the connection or change the PCB. 2.
5. Trouble Shooting Display code Title 07 Different Operation Mode Cause of error Check point & Normal condition • One of Indoor Unit operate cooling Another Unit • At the same time, this model cannot use cool and heating mode operate heating Check Point 1. Check another indoor model operation mode 2. Operating the same mode with the first operated indoor unit 3.
5. Trouble Shooting Display code Title 09 Indoor EEPROM Check Sum Error Cause of error • Check sum error Check point & Normal condition 1. Check the poor soldering 2. Check the insertion condition of the EEPROM 3. Check the PCB Connection Check Point 1. Check the EEPROM Direction 2. If the EEPROM value & the Program value are not matched, the Code is Displayed 3.
5. Trouble Shooting Display code Title Cause of error 10 Indoor BLDC Fan Motor Lock The Fan is not operated properly Yellow Check point & Normal condition Check the Indoor fan locking White Blue Black Red Fan motor connector Tester Check Point Check the PCB during the Power on 1. Check the Voltage Red line to Black line ’ The Voltage is about [input voltage x 1.414] ’ if the Voltage does not come with the above Voltage, ’ Check the power input ’ Replace the PCB & Motor 2.
5. Trouble Shooting 6.7 Troubleshooting Outdoor Error Display code 05 / 53 Title Title Communication (Indoor ’ Outdoor) Cause of error • Communication poorly Check point & Normal condition • Power input AC 230V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal. Check Point 1.
5. Trouble Shooting Display code Title Cause of error • Instant over current • Over Rated current • Poor insulation of IPM DC PEAK (IPM Fault) 21 Check point & Normal condition • An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant Pipe length. Outdoor Fan is stop • Poor insulation of compressor n Error Diagnosis and Countermeasure Flow Chart 1. Check Pipe clogging/distortion 2.
5. Trouble Shooting LED01M LED02M U,V,W CONNECTOR U V W 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. Set the multi tester to diode mode. 6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
5. Trouble Shooting Display code 22 Title Cause of error Max. C/T Input Over Current(18k13A↑, 24k/36k-20A↑) Check point & Normal condition 1. Malfunction of Compressor 2. Blocking of Pipe 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked... n Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? No Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal? No 1. Check Pipe clogging/distortion 2.
5. Trouble Shooting Check Point 1. Check the power source.(220V ±15%) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal - Check output the CT Sensor : DC 2.5±0.
5. Trouble Shooting Display code 23 Title DC Link Low voltage Cause of error • DC Link volt is below 140Vdc Check point & Normal condition • Check point & Normal condition • Check theCN_(L),CN_(N) Connection.
5. Trouble Shooting 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.
5. Trouble Shooting Display code Title 24 Press S/W Open Cause of error • Low / High press S/W open. Check point & Normal condition • Check the connection CN_L/PRESS,H/PRESS • Check the components.
5. Trouble Shooting Check Point 1. Check the connection of H/press switch 2.
5. Trouble Shooting Display code Title Cause of error 25 Input voltage • Abnormal Input voltage (140Vac , 300Vac) Check point & Normal condition • Check the power source. • Check the components. n Error Diagnosis and Countermeasure Flow Chart Is input voltage normal ? No Check L~N Voltage is 220V±15% Yes Is Inverter PCB Normal? No Replace inverter PCB assembly Yes Recheck power and installation condition Check Point 1. Check the Input Voltage (L–N ‘ 220V±10%) 2.
5.
5. Trouble Shooting Display code Title 26 DC Compressor Position Cause of error • Compressor Starting fail error Check point & Normal condition • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts. n Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? No 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4.
5. Trouble Shooting Display code 27 Title Cause of error Check point & Normal condition 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation damage/Motor Inverter PCB input damage) current is over100A(peak) 3. Input voltage abnormal (L,N) for 2us 4. Power line assemble condition abnormal 5.
5. Trouble Shooting Display code Title Cause of error 28 Inverter DC link high voltage error Inv PCB DC link voltage supplied over 420V Check point & Normal condition 1. Input voltage abnormal (L~N) 2.
5. Trouble Shooting Check Point 1. Check the CN_(L),CN_(N) Connection condition at the Inverter 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.
5. Trouble Shooting Display code 29 Title Inverter compressor over current Cause of error Check point & Normal condition 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) Inverter compressor input 2. Compressor damage(Insulation damage/Motor current is over 30A damage) 3. Input voltage low 4.
5. Trouble Shooting Display code Title 32 D-pipe (Inverter) temp. high (105°C↑) Cause of error Check point & Normal condition • Discharge sensor (Inverter) temp. high • Check the discharge pipe sensor for INV. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. D-Pipe temp. Toff(105) °C T2(95) °C T1(90) °C COMP Frequency Normal (Hz) LEV Openness (Pulse) Normal Normal OFF Normal OFF Control Check Point 1.
5. Trouble Shooting Display code Title C/T Sensor Error 40 Cause of error Check point & Normal condition • Initial current error • Malfunction of current detection circuit. (Open / Short) • Check CT Sensor output voltage : 2.5Vdc ±5% n Error Diagnosis and Countermeasure Flow Chart Is input voltage normal ? No Check L~N Voltage is 220V±15% Yes Is Inverter PCB Normal? No Replace inverter PCB assembly Yes Recheck power and installation condition Check Point 1.
5. Trouble Shooting Vdc 1 2 3 < CT Sensing Check Point > < Inverter PCB> Display code Title 52 Transmission error between (Inverter PCB ‘ Main PCB) Cause of error Check point & Normal condition Main controller of Master 1. Power cable or transmission cable is not connected unit of Master unit canʼt 2. Defect of outdoor Main fuse/Noise Filter receive signal from 3.
5. Trouble Shooting Display code Title 41 D-pipe sensor (Inverter) • Open / Short • Soldered poorly • Internal circuit error • Normal resistor : 200KΩ / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged) 44 Air sensor • Open / Short • Soldered poorly • Internal circuit error • Normal resistor : 10KΩ / at 25°C (Unplugged) • Normal voltage : 2.
5. Trouble Shooting Display code Title 51 Over capacity Cause of error • Check the indoor unit capacity. • Check the combination table. • Over capacity Combination Model Gross max. capacity A3UW243FA2 [MR24DY3JM] 36k Check point & Normal condition Max. single indoor unit capacity 18k A4UW363FA2 [MR36TQY3JM] 55k Check Point 1. Check the indoor unit capacity.
5. Trouble Shooting Display code 60 Title Cause of error Check point & Normal condition 1. EEPROM contact defect/wrong insertion 2. Different EEPROM Version 3. ODU Inverter & Main PCB assembly damage Inverter PCB & Main EEPROM Access error EEPROM check sum error and Check SUM error n Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal? No 1.Check EEPROM insert direction/connection condition 2.
5. Trouble Shooting Display code Title Cause of error 61 Condenser pipe sensor temp. high • Condenser pipe sensor detected high temp. Check Point - Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) Only for training and service purposes - 78 - Check point & Normal condition • Check the load condition. • Check the sensor of Condenser pipe sensor.
5. Trouble Shooting Display code 62 Title Heatsink High error Cause of error Check point & Normal condition Inverter PCB heatsink temperature is over 85°C 2. ODU fan locking 3. Heatsink assembly of INV PCB assemble condition abnormal 4. Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart Is installation condition normal ? No 1. Check fan locking 2. Check covering of heat exchanger 3. Check distance between ODU and obstacles 4.
5. Trouble Shooting Display code 65 Title Heatsink High error Cause of error Inverter PCB heatsink sensor is open or short Check point & Normal condition 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condition abnormal 3. Defect of temperature sensing circuit part defect of INV PCB n Error Diagnosis and Countermeasure Flow Chart Is installation condition normal ? No 1. Check fan locking 2. Check covering of heat exchanger 3. Check distance between ODU and obstacles 4.
5. Trouble Shooting Display code 67 Title Fan Lock Error Cause of error Check point & Normal condition 1. ODU fan locking Fan RPM is 10RPM or 2. Heatsink assembly of INV PCB assemble condiless for 5 sec. when ODU tion abnormal fan starts or 40 RPM or 3. Defect of temperature sensing circuit part defect less after fan starting.
5. Trouble Shooting Display code 73 Title AC input instant over current error (Matter of software) Cause of error Check point & Normal condition Inverter PCB input power current is over 48A(peak) for 2ms 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage (Insulation damage/Motor damage) 3. Input voltage abnormal (L, N) 4. Power line assemble condition abnormal 5.
5.
P/No : MFL63744408
