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Daikin ARX20K2V1B, Service Manual

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Summary of Contents for ARX20K2V1B

Page 1: ...Service Manual Applicable Models Inverter Pair Heat Pump Inverter Pair Wall Mounted Type FTX ATX K Series SiBE041525F ...

Page 2: ... K Series Heat Pump Indoor Unit FTX20K 2 V1B FTX50K M 2 V1B ATX20K 2 V1B FTX25K 2 V1B FTX60K M 2 V1B ATX25K 2 V1B FTX35K 2 V1B FTX71K M 2 V1B ATX35K 2 V1B Outdoor Unit RX20K2 5V1B RX50K 2 V1B ARX20K2V1B RX25K2 5V1B RX60K 2 V1B ARX25K2V1B RX35K2 5V1B RX71K 2 V1B ARX35K2V1B ...

Page 3: ...SiBE041525F Table of Contents ii Version log Month Year Version Revised contents 01 2016 SiBE041525E A RX20 35K2 02 2016 SiBE041525F Include RX71K FTX71KM standard S21 connection ...

Page 4: ...2 Frequency Principle 15 1 3 Airflow Direction Control 17 1 4 Fan Speed Control for Indoor Unit 18 1 5 Program Dry Operation 19 1 6 Automatic Operation 20 1 7 Thermostat Control 21 1 8 NIGHT SET Mode 22 1 9 ECONO Operation 22 1 10 Inverter POWERFUL Operation 23 1 11 Other Functions 24 2 Thermistor Functions 25 3 Control Specification 26 3 1 Mode Hierarchy 26 3 2 Frequency Control 27 3 3 Controls a...

Page 5: ...Overload 61 4 11 Compressor Lock 63 4 12 DC Fan Lock 64 4 13 Input Overcurrent Detection 65 4 14 Four Way Valve Abnormality 66 4 15 Discharge Pipe Temperature Control 68 4 16 High Pressure Control in Cooling 69 4 17 Compressor System Sensor Abnormality 70 4 18 Position Sensor Abnormality 71 4 19 Thermistor or Related Abnormality Outdoor Unit 73 4 20 Electrical Box Temperature Rise 75 4 21 Radiatio...

Page 6: ...ced Cooling Operation 91 2 Trial Operation 92 3 Field Settings 93 3 1 Temperature Display Switch 93 3 2 When 2 Units are installed in 1 Room 93 4 Silicone Grease on Power Transistor Diode Bridge 94 Part 8 Appendix 95 1 Piping Diagrams 96 1 1 Indoor Unit 96 1 2 Outdoor Unit 97 2 Wiring Diagrams 99 2 1 Indoor Unit 99 2 2 Outdoor Unit 101 ...

Page 7: ...arding Safety of Workers Warning Do not store equipment in a room with fire sources e g naked flames gas appliances electric heaters Be sure to disconnect the power cable from the socket before disassembling equipment for repair Working on equipment that is connected to the power supply may cause an electrical shock If it is necessary to supply power to the equipment to conduct the repair or inspe...

Page 8: ...n the refrigerant system If air enters the refrigerant system an excessively high pressure results causing equipment damage and injury Warning Caution Do not repair electrical components with wet hands Working on the equipment with wet hands may cause an electrical shock Do not clean the air conditioner with water Washing the unit with water may cause an electrical shock Be sure to provide an eart...

Page 9: ...ive heat generation or fire Be sure to use an exclusive power circuit for the equipment and follow the local technical standards related to the electrical equipment the internal wiring regulations and the instruction manual for installation when conducting electrical work Insufficient power circuit capacity and improper electrical work may cause an electrical shock or fire Be sure to use the speci...

Page 10: ...ot conducted securely the equipment may fall and cause injury Check to make sure that the power cable plug is not dirty or loose then insert the plug into a power outlet securely If the plug is dusty or has a loose connection it may cause an electrical shock or fire When replacing the coin battery in the remote controller be sure to dispose of the old battery to prevent children from swallowing it...

Page 11: ...oom and wet the furniture and floor Do not tilt the unit when removing it The water inside the unit may spill and wet the furniture and floor Caution Icon Type of Information Description Warning Warning A Warning is used when there is danger of personal injury Caution Caution A Caution is used when there is danger that the reader through incorrect manipulation may damage equipment lose data get an...

Page 12: ...SiBE041525F 1 List of Functions Part 1 List of Functions 1 Functions 2 ...

Page 13: ...ity Durability Auto restart after power failure 3 D airflow Self diagnosis R C LED COMFORT AIRFLOW operation Wiring error check function Comfort Control Auto fan speed Anti corrosion treatment of outdoor heat exchanger Indoor unit quiet operation Flexibility Multi split split type compatible indoor unit NIGHT QUIET mode automatic H P C O compatible indoor unit OUTDOOR UNIT QUIET operation manual F...

Page 14: ... D airflow Self diagnosis R C LED COMFORT AIRFLOW operation Wiring error check function Comfort Control Auto fan speed Anti corrosion treatment of outdoor heat exchanger Indoor unit quiet operation Flexibility Multi split split type compatible indoor unit NIGHT QUIET mode automatic H P C O compatible indoor unit OUTDOOR UNIT QUIET operation manual Flexible power supply correspondence 2 area INTELL...

Page 15: ...SiBE041525F Specifications 4 Part 2 Specifications 1 Specifications 5 ...

Page 16: ...Specifications SiBE041525F 5 Specifications 1 Specifications See corresponding databook ...

Page 17: ...ted Circuit Board Connector Wiring Diagram 6 Part 3 Printed Circuit Board Connector Wiring Diagram 1 Indoor Unit 7 1 1 20 25 35 Class 7 1 2 50 60 71 Class 9 2 Outdoor Unit 12 2 1 20 25 35 Class 12 2 2 50 60 71 class 13 ...

Page 18: ...ontrol PCB PCB1 1 S6 Connector for swing motor horizontal blade 2 S26 Connector for display PCB 3 S32 Connector for indoor heat exchanger thermistor 4 S200 Connector for DC fan motor 5 H1 H2 H3 FG Connector for terminal board 6 FU1 Fuse 3 15 A 250 V 7 V2 Varistor FG S32 S26 H3 H2 H1 S6 S200 2P341918 9 FU1 V2 ...

Page 19: ... BR069 1 S27 Connector for control PCB 2 SW1 S1W Forced cooling operation ON OFF button Refer to page 91 for details 3 LED1 H1P LED for operation green 4 LED2 H2P LED for timer yellow 5 RTH1 R1T Room temperature thermistor S27 SW1 Solder side LED2 LED1 RTH1 3P185701 4 LED3 is not mounted S602 S21 To connector S403 of control PCB PCB1 S601 To optional wired remote controller BRC073 and BRP069 ...

Page 20: ...ram 1 2 50 60 71 Class Control PCB PCB2 1 S6 Connector for swing motor horizontal blade 2 S26 Connector for display PCB 3 S32 Connector for indoor heat exchanger thermistor 4 S200 Connector for DC fan motor 5 S900 Connector for filter PCB S26 S900 3P380931 1 S6 S32 S200 ...

Page 21: ... board 2 S800 Connector for control PCB 3 FG HE Connector for ground 4 FU1 Fuse 3 15 A 250 V 5 V2 Varistor 3P380932 1 FG S800 V2 HE S100 FU1 1 S27 Connector for control PCB 2 SW1 S1W Forced cooling operation ON OFF button Refer to page 91 for details 3 LED1 H1P LED for operation green 4 LED2 H2P LED for timer yellow 5 RTH1 R1T Room temperature thermistor S27 SW1 Solder side LED2 LED1 RTH1 3P185701...

Page 22: ...ndoor Unit SiBE041525F 11 Printed Circuit Board Connector Wiring Diagram Remote Control PCB BR069 S602 S21 To connector S403 of control PCB PCB1 S601 To optional wired remote controller BRC073 and BRP069 ...

Page 23: ...nnector for DC fan motor 5 S80 Connector for four way valve coil 6 S90 Connector for thermistors outdoor temperature outdoor heat exchanger discharge pipe 7 E1 E2 Terminal for earth wire 8 HL1 HN1 S Connector for terminal board 9 HR1 HR2 Connector for reactor 10 FU1 FU2 Fuse 3 15 A 250 V 11 FU3 Fuse 20 A 250 V 12 LED A LED for service monitor green 13 V2 V3 V150 Varistor E1 E2 FU3 V150 V2 V3 FU1 F...

Page 24: ...nnector for four way valve coil heat pump model only 5 S90 Connector for thermistors outdoor temperature outdoor heat exchanger discharge pipe 6 HL1 HN1 S Connector for terminal board 7 E1 E2 Terminal for ground 8 U V W Connector for compressor 9 FU1 FU2 Fuse 3 15 A 250 V 10 FU3 Fuse 30 A 250 V 11 LED A LED for service monitor green 12 V1 V2 V3 Varistor U V W FU3 FU1 FU2 V3 V2 V1 S20 S80 S40 S90 S...

Page 25: ...9 ECONO Operation 22 1 10 Inverter POWERFUL Operation 23 1 11 Other Functions 24 2 Thermistor Functions 25 3 Control Specification 26 3 1 Mode Hierarchy 26 3 2 Frequency Control 27 3 3 Controls at Mode Changing Start up 29 3 4 Discharge Pipe Temperature Control 31 3 5 Input Current Control 32 3 6 Freeze up Protection Control 33 3 7 Heating Peak cut Control 33 3 8 Outdoor Fan Control 34 3 9 Liquid ...

Page 26: ...s controlled by the following 2 parameters The load condition of the operating indoor unit The difference between the room thermistor temperature and the target temperature The target frequency is adapted by additional parameters in the following cases Frequency restrictions Initial settings Forced cooling operation Inverter Principle To regulate the capacity a frequency control is needed The inve...

Page 27: ...Once the set temperature is reached the energy saving operation enables to maintain the room temperature at low power Frequency Limits The following functions regulate the minimum and maximum frequency Forced Cooling Operation Refer to page 91 for details Refrigerant circulation rate high high f low f freq variable Refrigerant circulation rate low high speed low speed R2812 Amount of heat exchange...

Page 28: ...s airflow downward to spread the warm air to the entire room Wide Angle Louvers The louvers made of elastic synthetic resin provide a wide range of airflow that guarantees comfortable air distribution Auto Swing The following table explains the auto swing process for cooling dry heating and fan COMFORT AIRFLOW Operation The flap is controlled not to blow the air directly at the people in the room ...

Page 29: ... setting button is set to automatic Cooling The following drawing explains the principle of fan speed control for cooling The upper limit is M tap in 30 minutes from the operation start Heating In heating operation the fan speed is regulated according to the indoor heat exchanger temperature and the difference between the room thermistor temperature and the target temperature COMFORT AIRFLOW Opera...

Page 30: ... the target temperature is divided into two zones Then the unit operates in an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable level Thermostat turns on also when the room temperature is in the zone B for 10 minutes Room thermistor temperature at start up Target temperature X Thermostat OFF point Y Thermostat ON point Z 24 C or more Room thermistor temp...

Page 31: ... set temperature Ts determines the target temperature Tt Ts 18 30 C 2 The target temperature Tt is calculated as Tt Ts C where C is the correction value C 0 C 3 Thermostat ON OFF point and operation mode switching point are as follows Tr means the room thermistor temperature 1 Heating Cooling switching point Tr Tt 3 0 C 2 Cooling Heating switching point Tr Tt 3 0 C 3 Thermostat ON OFF point is the...

Page 32: ...The system resumes from defrost control in any zones except A The operation turns on in any zones except A The monitoring time has passed while the temperature difference is in the zone B Cooling 10 minutes Dry 7 5 minutes Heating 10 seconds Cooling Dry Heating Refer to Temperature Control on page 15 for details Zone B Zone A OFF ON Zone C Room thermistor temperature target temperature 1 5 C R2211...

Page 33: ...ity does not allow the use of multiple electrical devices and air conditioners It can be easily activated by pushing the ECONO button on the wireless remote controller Detail When this function is activated the maximum capacity also decreases The remote controller can send the ECONO command when the unit is in cooling heating dry or automatic operation This function can only be set when the unit i...

Page 34: ...rpm Ex POWERFUL operation in cooling Note POWERFUL operation cannot be used together with ECONO or COMFORT AIRFLOW operation Operation mode Fan speed Target temperature COOL H tap A rpm 18 C DRY Dry rotating speed A rpm Lowered by 2 5 C HEAT H tap A rpm 31 C FAN H tap A rpm AUTO Same as cooling heating in POWERFUL operation The target temperature is kept unchanged R19177 Target temp Fan A rpm 18 C...

Page 35: ...lay of the unit Press the ON OFF button once to start operation Press once again to stop it The ON OFF button is useful when the remote controller is missing or the battery has run out Forced cooling operation Forced cooling operation can be started by pressing the ON OFF button for 5 9 seconds while the unit is not operating Refer to page 91 for details Note When the ON OFF button is pressed for ...

Page 36: ...ure used in place of the inner temperature of the compressor rises abnormally the operating frequency becomes lower or the operation halts 2 The discharge pipe thermistor is used for detecting disconnection of the discharge pipe thermistor 3 Indoor Heat Exchanger Thermistor 1 The indoor heat exchanger thermistor is used for controlling the target discharge pipe temperature The system sets the targ...

Page 37: ...ode for installation and servicing Detail Note Unless specified otherwise a dry operation command is regarded as cooling operation Air conditioner control mode Forced operation mode Forced cooling operation for pump down operation Power transistor test mode Normal operation mode Fan Cooling includes drying Heating Heating Defrosting Stop indoor unit OFF Preheating operation Discharging from capaci...

Page 38: ...peak cut freeze up protection defrost 3 Determine lower limit frequency The maximum value is set as a lower limit frequency among the frequency lower limits of the following functions Four way valve operation compensation draft prevention pressure difference upkeep 4 Determine prohibited frequency There is a certain prohibited frequency such as a power supply frequency Command frequency Limit freq...

Page 39: ...djusted according to the D value When the D value is low the frequency is lowered When the D value is high the frequency is increased 3 Frequency control when other controls are functioning When frequency is dropping Frequency control is carried out only when the frequency drops For controlling lower limit Frequency control is carried out only when the frequency rises 4 Upper and lower limit of fr...

Page 40: ...diation fin temperature 85 C OFF condition Discharge pipe temperature 2 C Radiation fin temperature 90 C Control B ON condition Discharge pipe temperature 10 C Radiation fin temperature 85 C OFF condition Discharge pipe temperature 12 C Radiation fin temperature 90 C 3 3 2 Four Way Valve Switching Outline The four way valve coil is energized not energized depending on the operation mode Heating ON...

Page 41: ...r way valve switching The lower limit of frequency keeps A Hz for B seconds with any conditions 1 through 4 above When the outdoor temperature is above C C in heating the frequency decreases depending on the outdoor temperature 3 3 4 3 Minute Standby Turning on the compressor is prohibited for 3 minutes after turning it off The function is not activated when defrosting 3 3 5 Compressor Protection ...

Page 42: ...emperature from rising further Detail 20 25 35 class 50 60 71 class A C 110 110 B C 103 103 C C 98 101 5 D C 93 100 E C 88 95 Zone Control Stop zone When the temperature reaches the stop zone the compressor stops Dropping zone The upper limit of frequency decreases Keep zone The upper limit of frequency is kept Up zone The upper limit of frequency increases Reset zone The upper limit of frequency ...

Page 43: ...zone The upper limit of the compressor frequency is defined as operation frequency 2 Hz After this the output frequency is lowered by 2 Hz every second until it reaches the keep zone Keep zone The present maximum frequency goes on Reset zone Limit of the frequency is canceled Limitation of current dropping and stop value according to the outdoor temperature The current drops when outdoor temperatu...

Page 44: ...igh pressure The operating frequency limitation is judged with the indoor heat exchanger temperature A C B C C C 7 5 3 R22433 Reset zone Indoor heat exchanger thermistor temperature Up zone Keep zone Dropping zone Stop zone 0 C C C B C A C 13 C 20 25 35 class 50 60 71 class A C 65 60 B C 55 54 C C 52 51 D C 50 49 E C 45 44 Zone Control Stop zone When the temperature reaches the stop zone the compr...

Page 45: ...as normal operation 5 Fan speed control during forced cooling operation The outdoor fan is controlled as well as normal operation during forced cooling operation 6 Fan speed control during POWERFUL operation The rotation speed of the outdoor fan is increased during POWERFUL operation 7 Fan speed control during indoor unit quiet operation The rotation speed of the outdoor fan is reduced by the comm...

Page 46: ...e start of the operation or ending the previous defrosting Conditions for Canceling Defrost The judgment is made with the outdoor heat exchanger temperature B C The same value continues 20 25 class 35 class 50 class 60 71 class A minute 28 28 25 25 B C 4 22 4 22 6 30 6 30 C Hz 74 74 48 48 D Hz 74 74 42 42 E seconds 80 80 60 60 F seconds 60 60 60 60 G seconds 630 630 460 460 H seconds 100 70 60 90 ...

Page 47: ... discharge pipe thermistor is disconnected Feedback Control Target discharge pipe temperature control Detail The followings are the examples of electronic expansion valve control which function in each operation mode Available Not available Control Status Starting operation control Control when the frequency changes Target discharge pipe temperature control Discharge pipe thermistor disconnection ...

Page 48: ...g Operation Control The electronic expansion valve opening is controlled when the operation starts thus preventing superheating or liquid compression 3 11 5 Control when the Frequency Changes When the target discharge pipe temperature control is active if the target frequency changes to a specified value in a certain time period the target discharge pipe temperature control is canceled and the tar...

Page 49: ...tained Discharge pipe temperature 6 C outdoor heat exchanger temperature 2 When the operation mode is heating When the following condition is fulfilled the discharge pipe thermistor disconnection is ascertained Discharge pipe temperature 6 C indoor heat exchanger temperature When the thermistor is disconnected When the disconnection is ascertained the compressor continues operation for 9 minutes a...

Page 50: ...ture thermistor 3 12 2 Detection of Overcurrent and Overload Outline An excessive output current is detected and the OL temperature is observed to protect the compressor Detail If the OL compressor head temperature exceeds 120 130 C depending on the model the system shuts down the compressor If the inverter current exceeds 14 18 A depending on the model the system shuts down the compressor The upp...

Page 51: ...SiBE041525F Remote Controller 40 Part 5 Remote Controller 1 Remote Controller 41 ...

Page 52: ...each section is shown with all its displays on for the purpose of explanation R22988 Signal transmitter To use the remote controller aim the transmitter at the indoor unit If there is anything blocking the signals between the unit and the remote controller such as a curtain the unit may not operate The maximum transmission distance is about 7 m Receiver OFF button Press this button to stop the ope...

Page 53: ...2 button Starts COMFORT AIRFLOW operation ON TIMER button Adjusts the ON TIMER setting The timer can be set 1 12 hours In indoor unit quiet operation operation sound becomes weak The airflow rate also decreases In DRY operation the airflow rate setting is not available FAN setting button Selects the airflow rate setting every time you press this button AUTO Indoor unit quiet Airflow rate 1 5 Low t...

Page 54: ... Lock 63 4 12 DC Fan Lock 64 4 13 Input Overcurrent Detection 65 4 14 Four Way Valve Abnormality 66 4 15 Discharge Pipe Temperature Control 68 4 16 High Pressure Control in Cooling 69 4 17 Compressor System Sensor Abnormality 70 4 18 Position Sensor Abnormality 71 4 19 Thermistor or Related Abnormality Outdoor Unit 73 4 20 Electrical Box Temperature Rise 75 4 21 Radiation Fin Temperature Rise 76 4...

Page 55: ... lamp OFF Check the outdoor temperature Heating operation is not available when the outdoor temperature is 18 CWB or higher and cooling operation is not available when the outdoor temperature is below 10 CDB Diagnose with remote controller indication 49 The unit operates but does not cool or does not heat Check for wiring and piping errors in the connection between the indoor unit and outdoor unit...

Page 56: ...unctions 2 When a signal transmission error occurs between the indoor and outdoor units In either case conduct the diagnostic procedure described in the following pages 2 2 Outdoor Unit The outdoor unit has a green LED LED A on the PCB When the microcomputer works in order the LED A blinks However the LED A turns OFF while the standby electricity saving function is activated and the power supply i...

Page 57: ...2 To return to the normal mode hold the TIMER CANCEL button down for 5 seconds When the remote controller is left untouched for 60 seconds it also returns to the normal mode 3 Not all the error codes are displayed When you cannot find the error code try method 2 Refer to page 47 No Code No Code No Code 1 00 16 A3 31 UF 2 A5 17 H8 32 UH 3 E7 18 H9 33 P4 4 F3 19 C9 34 H7 5 F6 20 CC 35 U2 6 L3 21 C4 ...

Page 58: ...e 5C is displayed on the LCD 2 Select 5C service check with the TEMP or TEMP button 3 Press the FAN button to enter the service check mode 00 is displayed and the left side number blinks 4 Press the TEMP or TEMP button and change the number until you hear the two consecutive beeps or the long beep R21666 R21059 R21667 R21061 R21668 ...

Page 59: ...P or TEMP button and change the number until you hear the long beep 8 Diagnose by the sound beep The left side number does not correspond with the error code two consecutive beeps The left side number corresponds with the error code but the right side number does not long beep Both the left side and right side numbers correspond with the error code 9 Determine the error code The numbers indicated ...

Page 60: ... related abnormality 54 C9 Room temperature thermistor or related abnormality 54 Outdoor Unit E1 Outdoor unit PCB abnormality 60 E5 OL activation compressor overload 61 E6 Compressor lock 63 E7 DC fan lock 64 E8 Input overcurrent detection 65 EA Four way valve abnormality 66 F3 Discharge pipe temperature control 68 F6 High pressure control in cooling 69 H0 Compressor system sensor abnormality 70 H...

Page 61: ...ply voltage Start operation Voltage as rated Error repeats Check the power supply voltage Start operation Voltage as rated Error repeats Error repeats Combination of the indoor and outdoor unit matched YES NO NO YES NO NO YES R20486 Caution To secure the connection once disconnect the connector and then reconnect it YES NO YES NO YES NO YES Match the compatible models Correct the power supply Repl...

Page 62: ...trol During heating operation the indoor heat exchanger temperature is above about 60 C Supposed Causes Short circuited air Clogged air filter of the indoor unit Dust accumulation on the indoor heat exchanger Defective indoor heat exchanger thermistor Defective indoor unit PCB Troubleshooting Check No 01 Refer to P 79 NO NO NO Check No 01 Check the indoor heat exchanger thermistor YES YES R21064 Y...

Page 63: ...tor operation Error Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap and is less than 50 of the maximum fan motor rotation speed Supposed Causes Disconnection of connector Foreign matter stuck in the fan Layer short inside the fan motor winding Breaking of wire inside the fan motor Breaking of the fan motor lead wires Defective capacitor ...

Page 64: ...d the fan Is the rotation pulse generated Rotate the fan by hand Turn the power on again Check the fan motor for breakdown or short circuit Check the motor control voltage Check the indoor unit PCB for rotation pulse Fan rotates smoothly Resistance OK Is the motor control voltage 15 VDC generated Correct the connection Remove the foreign matters Replace the indoor fan motor Replace the indoor unit...

Page 65: ...pposed Causes Disconnection of connector Thermistor corresponding to the error code is defective Defective indoor unit PCB Troubleshooting Check No 01 Refer to P 79 C4 Indoor heat exchanger thermistor C9 Room temperature thermistor YES R21870 NO Check No 01 Check the thermistor resistance value YES NO Caution Correct the connection Replace the defective thermistor Replace the indoor unit PCB contr...

Page 66: ...n the model The compressor stops if the error occurs and restarts automatically after 3 minute standby Over voltage detection An over voltage signal is fed from the over voltage detection circuit to the microcomputer over 458 500 V depending on the model The compressor stops if the error occurs and restarts automatically after 3 minute standby Supposed Causes Power supply voltage is not as specifi...

Page 67: ...S YES YES Reconnect the harness Check the power supply voltage Check the connection of the compressor harness Disturbance factors Noise Power supply distortion Precaution before turning on the power again Make sure the power has been off for at least 30 seconds Turn on the power System restarted Repeat a few times Loose or disconnected NO NO Replace the outdoor fan motor and the outdoor unit PCB m...

Page 68: ...ormal Error Decision Conditions The data sent from the outdoor unit cannot be received normally or the content of the data is abnormal Supposed Causes Power supply voltage is not as specified Reduction of power supply voltage Wiring error Breaking of the connecting wires between the indoor and outdoor units wire No 3 Defective outdoor unit PCB Short circuit inside the fan motor winding Defective i...

Page 69: ...door unit Is LED A blinking Properly insulated Is there any disturbance Is there any wiring error Check the indoor unit outdoor unit connection wires Check the LED A on the outdoor unit PCB Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Before you check the LED A cancel the standby electricity saving function by starting fan operation wit...

Page 70: ...rconnected Wrong wiring of connecting wires Wrong indoor unit PCB or outdoor unit PCB mounted Defective indoor unit PCB Defective outdoor unit PCB Troubleshooting R20435 Caution NO YES YES NO Match the compatible models OK Correct the connection Check the code numbers 2P012345 for example of the indoor and outdoor unit PCB with the Parts List If not matched change for the correct PCB Are the conne...

Page 71: ... the power switch before connecting or disconnecting connectors or parts may be damaged Continuously ON or OFF Blink Check the voltage of the connection wires on the indoor terminal board between No 1 and No 2 NO YES Replace the connection wires between the indoor unit and outdoor unit Normal YES R22771 NO Replace the outdoor unit PCB main PCB Ground the system Zero cross signal abnormality Replac...

Page 72: ...own Reset condition Continuous run for about 60 minutes without any other error Supposed Causes Disconnection of discharge pipe thermistor Defective discharge pipe thermistor Disconnection of connector S40 Disconnection of 2 terminals of OL Q1L Defective OL Q1L Broken OL harness Defective electronic expansion valve or coil Defective four way valve or coil Defective outdoor unit PCB Refrigerant sho...

Page 73: ...electronic expansion valve or the coil Refer to the refrigerant line check procedure Replace the outdoor unit PCB main PCB Replace the four way valve or the coil Replace the outdoor unit PCB main PCB Discharge pipe thermistor disconnected Check No 01 Check the discharge pipe thermistor Check No 13 Check the four way valve Check No 14 Check the refrigerant line Check No 12 Check the electronic expa...

Page 74: ...the harnesses U V and W R21067 Caution NO YES YES NO NO YES NO YES Check No 15 Check with the inverter analyzer Turn off the power and reconnect the harnesses Turn on the power again and restart the system Precaution before turning on the power again Make sure the power has been off for at least 30 seconds Correct the power supply or replace the outdoor unit PCB main PCB Open the stop valve Invert...

Page 75: ...uck in the fan Defective fan motor Defective outdoor unit PCB Troubleshooting Check No 16 Refer to P 85 FU2 R21669 Caution YES YES NO YES NO NO YES NO NO Turn on the power Rotate the fan YES Check No 16 Check the rotation pulse input on the outdoor unit PCB main PCB Turn off the power and reconnect the connector Remove the foreign matter Replace the outdoor fan motor Replace the fuse Replace the o...

Page 76: ... No 18 Refer to P 86 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged An input overcurrent may result from wrong internal wiring If the system is interrupted by an input overcurrent after the wires have been disconnected and reconnected for part replacement check the wiring again R21863 NO YES YES NO Start operation and measure the ...

Page 77: ...lowing condition continues over 10 minute after operating for 5 minutes Cooling Dry A B 5 C Heating B A 5 C A Room thermistor temperature B Indoor heat exchanger temperature If the error repeats the system is shut down Reset condition Continuous run for about 60 minutes without any other error Supposed Causes Disconnection of four way valve coil Defective four way valve coil or harness Defective o...

Page 78: ...st clogged Reconnect the thermistor s Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged R20405 Refrigerant shortage Water mixed Stop valve Four way valve coil disconnected loose Harness disconnected Any thermistor disconnected Check No 01 Check the thermistors Check No 14 Check the refrigerant line Check No 13 Check the four way valv...

Page 79: ...lectronic expansion valve or coil Refrigerant shortage Defective four way valve Water mixed in refrigerant Defective stop valve Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 79 Check No 12 Refer to P 81 Check No 14 Refer to P 82 A C B C 20 25 35 class 110 88 50 60 71 class 110 95 R20417 Caution NG OK OK OK NG NG Discharge pipe thermistor Outdoor heat exchanger thermistor Outdoo...

Page 80: ...istor Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 79 Check No 12 Refer to P 81 Check No 17 Refer to P 86 Check No 18 Refer to P 86 Check No 19 Refer to P 87 R20418 Caution Replace the outdoor fan motor Reconnect the connector or fan motor lead wires Replace the stop valve Replace the outdoor heat exchanger thermistor Replace the outdoor unit PCB main PCB Replace the electroni...

Page 81: ...ltage before compressor start up is below 50 V Supposed Causes Broken or disconnected harness Defective outdoor unit PCB Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged NO R22772 YES Turn off the power Then turn on the power to restart the system YES NO Replace the harness Replace the outdoor unit PCB main PCB Is th...

Page 82: ... the position detection circuit Error Decision Conditions If the error repeats the system is shut down Reset condition Continuous run for about 11 minutes without any other error Supposed Causes Power supply voltage is not as specified Disconnection of the compressor harness Defective compressor Defective outdoor unit PCB Start up failure caused by the closed stop valve Input voltage is outside th...

Page 83: ...Check with the inverter analyzer Turn off the power Disconnect the harnesses U V and W Turn on the power Check the electrolytic capacitor voltage Electrical components or compressor harnesses connected as specified Replace the outdoor unit PCB main PCB Correct the power supply or replace the outdoor unit PCB main PCB Replace the compressor Reconnect the electrical components or compressor harnesse...

Page 84: ...power on J3 error is judged if the discharge pipe temperature is lower than the heat exchanger temperature Supposed Causes Disconnection of the connector for the thermistor Thermistor corresponding to the error code is defective Defective heat exchanger thermistor in the case of J3 error outdoor heat exchanger thermistor in cooling operation or indoor heat exchanger thermistor in heating operation...

Page 85: ...or s of the following thermistors Outdoor temperature thermistor Discharge pipe thermistor Outdoor heat exchanger thermistor Cooling Outdoor heat exchanger temperature Heating Indoor heat exchanger temperature Replace the indoor heat exchanger thermistor Replace the outdoor unit PCB main PCB Error displayed again on remote controller Indoor heat exchanger thermistor functioning Check No 01 Check t...

Page 86: ...or unit PCB Troubleshooting Check No 17 Refer to P 86 Check No 19 Refer to P 87 A C B C C C 20 25 35 class 93 70 78 50 60 71 class 90 64 81 Caution WARNING To cool the electrical components the outdoor fan starts when the radiation fin temperature rises above C C The outdoor fan stops when the radiation fin temperature drops below B C R21436 YES NO YES NG NO OK NO YES Turn off the power Then turn ...

Page 87: ...ter replacing the outdoor unit PCB Troubleshooting Check No 17 Refer to P 86 Check No 19 Refer to P 87 Note Refer to Silicone Grease on Power Transistor Diode Bridge on page 94 for details A C B C 20 25 35 class 93 78 50 60 71 class 100 57 Caution Turn off the power Then turn on the power to restart the system Be sure to turn off the power switch before connecting or disconnecting connectors or pa...

Page 88: ... rotation speed error occurs while the compressor is running An output overcurrent signal is fed from the output overcurrent detection circuit to the microcomputer If the error repeats the system is shut down Reset condition Continuous run for about 11 minutes without any other error Supposed Causes Poor installation condition Closed stop valve Defective power module Wrong internal wiring Abnormal...

Page 89: ...the power supply voltage Monitor the power supply voltage discharge and suction pressures and other factors for a long term Possible causes Momentary drop of power supply voltage Compressor overload Short circuit Check the installation condition Check with the inverter analyzer Check the power module Not a malfunction Keep observing Check the connectors and other components Fully open the stop val...

Page 90: ...B remove the thermistor and measure the resistance The data is for reference purpose only Thermistor temperature C Resistance kΩ Room temperature thermistor Other thermistors 20 73 4 197 8 15 57 0 148 2 10 44 7 112 1 5 35 3 85 60 0 28 2 65 93 5 22 6 51 14 10 18 3 39 99 15 14 8 31 52 20 12 1 25 02 25 10 0 20 00 30 8 2 16 10 35 6 9 13 04 40 5 8 10 62 45 4 9 8 707 50 4 1 7 176 R25 C 10 kΩ B 3435 K R2...

Page 91: ...l voltage check 1 Check the connector for connection 2 Check the motor control voltage is generated between the pins 2 3 Rotation pulse check 1 Check the connector for connection 2 Turn the power on and stop the operation 3 Check if the Hall IC generates the rotation pulse 4 times when the fan motor is manually rotated once between the pins 1 3 R11979 12 11 10 9 8 7 6 5 4 3 2 1 Phase U Free pin Fr...

Page 92: ... is correctly connected to the PCB 2 Turn the power off and on again and check if the EV generates a latching sound 3 If the EV does not generate a latching sound in the above step 2 disconnect the connector and check the continuity using a multimeter 4 Check the continuity between the pins 1 6 2 6 3 6 and 4 6 between the pins 1 5 2 5 3 5 4 5 for the 5P connector models If there is no continuity b...

Page 93: ...oil Cooling Dry Not energized Heating Energized Replace the outdoor unit PCB main PCB Replace the four way valve coil Replace the four way valve Four way valve coil resistance at 1000 2000 Ω S80 voltage at 220 240 VAC with compressor on Fig 1 R11904 Fig 1 Voltage at S80 220 240 VAC Time Compressor ON Refrigerant system check Check for refrigerant leakage See the service diagnosis on refrigerant sh...

Page 94: ...re to turn the power off Step 2 Install an inverter analyzer instead of a compressor Note Make sure the charged voltage of the built in smoothing electrolytic capacitor drops to 10 VDC or below before carrying out the service work Reference If the terminals of the compressor are not FASTON terminals difficult to remove the wire on the terminals it is possible to connect wires available on site to ...

Page 95: ...eck the power module Refer to Check No 22 3 If NG in Check No 22 replace the power module Replace the main PCB The power module is united with the main PCB If OK in Check No 22 check if there is any solder cracking on the PCB 4 If any solder cracking is found replace the PCB or repair the soldered section If there is no solder cracking replace the PCB Caution 1 When the output frequency is low the...

Page 96: ...s 2 4 is 0 6 5 VDC 5 Keep operation off and power off Connect the connector S70 or S71 6 Check whether 4 rotation pulses 0 15 VDC are input at the pins 1 4 when the fan motor is rotated 1 turn by hand When the fuse is melted check the outdoor fan motor for proper function If NG in step 2 Defective PCB Replace the outdoor unit PCB main PCB If NG in step 4 Defective Hall IC Replace the outdoor fan m...

Page 97: ... dirty Change the installation location or direction Change the installation location or direction Clean the outdoor heat exchanger Check the outdoor temperature The outdoor temperature should be within the operation range Change the installation location or direction R19385 YES YES YES NO NO NO NO YES Is the air filter or indoor outdoor heat exchanger dirty Is the connection pipe deformed Is the ...

Page 98: ...the table below If the resistance is or less than 1 kΩ short circuit occurs on the main circuit 20 25 35 class R21195 YES NO NO YES Outdoor fan system is functioning Check the outdoor fan system Reconnect the connector Is the outdoor fan running Fan motor lead wire connector disconnected Go to Check No 16 Positive terminal of digital multimeter 2 3 4 2 3 1 Negative terminal of digital multimeter 4...

Page 99: ...press the protrusion on the connector Follow the procedure below to measure resistance between the terminals of the power module and the terminals of the compressor with a multimeter Evaluate the measurement results referring to the following table R20701 1 2 3 4 Multimeter Positive terminal of digital multimeter Power module UVW Power module UVW Negative terminal of digital multimeter UVW Power m...

Page 100: ...Check SiBE041525F 89 Service Diagnosis 20 25 35 class 50 60 71 class Pin 24 Pin 23 U Pin 22 V Pin 21 W Pin 20 R20703 R20704 W V U DC_P1 DC_N1 ...

Page 101: ...and Field Settings 1 Tips for Servicing 91 1 1 Pump Down Operation 91 1 2 Forced Cooling Operation 91 2 Trial Operation 92 3 Field Settings 93 3 1 Temperature Display Switch 93 3 2 When 2 Units are installed in 1 Room 93 4 Silicone Grease on Power Transistor Diode Bridge 94 ...

Page 102: ...iquid stop valve Service port R13628 Hexagonal wrench Item Forced Cooling Conditions The forced cooling operation is allowed when both of the following conditions are met 1 The outdoor unit is not abnormal and not in the 3 minute standby mode 2 The outdoor unit is not operating Start Press the forced cooling operation ON OFF button SW1 on the indoor unit for 5 seconds Command frequency 20 25 35 cl...

Page 103: ...erature 30 C Trial operation may be disabled in either operation mode depending on the room temperature After trial operation is complete set the temperature to a normal level 26 C 28 C in cooling 20 C 24 C in heating operation For protection the system does not start for 3 minutes after it is turned off ARC480 Series 1 Press the center of the TEMP button and the OFF button on the remote controlle...

Page 104: ...d the corresponding wireless remote controller can be set for different addresses Procedure 1 Remove the battery cover of the remote controller and cut the address jumper 2 Press the center of the TEMP button and the OFF button on the remote controller at the same time 3 Select A address setting with the TEMP or TEMP button 4 Press the FAN button to enter the address setting mode The indoor unit o...

Page 105: ...bridge Detail 1 Wipe off the old silicone grease completely 2 Apply the silicone grease evenly See the illustrations below for examples of application 3 Tighten the screws of the power transistor diode bridge 4 Make sure that the heat radiation parts are firmly contacted to the radiation fin Note Smoke emission may be caused by bad heat radiation when the silicone grease is not appropriately appli...

Page 106: ...SiBE041525F 95 Appendix Part 8 Appendix 1 Piping Diagrams 96 1 1 Indoor Unit 96 1 2 Outdoor Unit 97 2 Wiring Diagrams 99 2 1 Indoor Unit 99 2 2 Outdoor Unit 101 ...

Page 107: ...exchanger Crossflow fan Thermistor heat exchanger Fan motor Refrigerant flow Cooling Heating Field piping 6 4 CuT Field piping 9 5 CuT 9 5 CuT 6 4 CuT 4D0094181 6 4 CuT Indoor unit 12 7 CuT Heat exchanger Distributor Thermistor heat exchanger Crossflow fan Fan motor Field piping 6 4 CuT Field piping 12 7 CuT Refrigerant flow Cooling Heating 4D094179A ...

Page 108: ...e thermistor Compressor Accumulator Muffler Gas stop valve Liquid stop valve Field piping 6 4 CuT Field piping 9 5 CuT 4 way valve ON heating 3D090673B Outdoor unit Field piping 6 4 CuT Field piping 9 5 CuT 9 5 CuT 9 5 CuT 6 4 CuT 9 5 CuT 9 5 CuT Propeller fan Discharge pipe thermistor Compressor Accumulator 7 0 CuT 7 0 CuT 7 0 CuT 6 4 CuT 6 4 CuT 7 0 CuT Heat exchanger Outdoor air temperature the...

Page 109: ...ield piping 6 4 CuT Field piping 12 7 CuT 12 7 CuT 4 way valve ON heating Outdoor temperature Thermistor 3D094281 12 7 CuT 7 9 CuT Cooling Heating 7 0 CuT Capillary tube 1 4 0 CuT Capillary tube 2 4 0 CuT Capillary tube 3 4 0 CuT 12 7 CuT 6 4 CuT 6 4 CuT 6 4 CuT 7 9 CuT 12 7 CuT 12 7 CuT 6 4 CuT 7 0 CuT 7 0 CuT 7 0 CuT 7 0 CuT 7 0 CuT Outdoor unit Heat exchanger Refrigerant flow Heat exchanger the...

Page 110: ...2 Wiring Diagrams 2 1 Indoor Unit FTX20 25 35K 2 V1B ATX20 25 35K 2 V1B Note PCB1 Control PCB PCB2 Display PCB Refer to Part 3 for Printed Circuit Board Connector Wiring Diagram PCB3 Remote Control PCB BR069 only available on A FTX20 35K2V1B ...

Page 111: ...s Appendix 100 FTX50 60 71K M 2 V1B Note PCB A1P Filter PCB PCB A2P Control PCB PCB A3P Display PCB Refer to Part 3 for Printed Circuit Board Connector Wiring Diagram PCB A4P Remote Control PCB BR069 only available on FTX50 71KM ...

Page 112: ... WHT YLW ORG BLU BLU BLU BLK BLK BLK BLK BLK BLK BLK BLK RED WHT RED BRN ORG BLU Outdoor Discharge Condenser R1T R2T R3T Z1C N 2 t t t DB1 X1M PCB1 M1C Q1L IPM1 SA1 Y1R Y1E Diode bridge Terminal strip Printed circuit board Compressor motor Overload protector Intelligent power module Surge arrestor Reversing solenoid valve coil Electronic expansion valve coil FU1 FU2 FU3 L1 L1R HL1 HN1 E1 E2 HR1 HR...

Page 113: ... MS 3 IN CASE OF HEAT PUMP TYPE R1T OUTDOOR R3T DISCHARGE R2T CONDENSER NOTE 1 REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS C7 DB1 FU1 FU2 FU3 IPM1 L N M1C MS 3 M1F MS MRM10 MRM20 MR30 MRCW PAM ZF E1 E2 S HL1 HN1 W V U WIRING DIAGRAM CONNECTION PROTECTIVE EARTH EARTH VARISTOR TERMINAL BLOCK ELECTRONIC EXPANSION VALVE COIL REVERSING SOLENOID VALVE COIL FERRITE CORE No OF PASSES THROUGH FERRITE...

Page 114: ...es supplied or specified by Daikin Ask a qualified installer or contractor to install those parts and accessories Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage electrical shock fire or explosion Read the user s manual carefully before using this product The user s manual provides important safety instructions ...

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