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Daikin FTXS30HVJU, Service Manual, Page: 107 / 202

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Daikin FTXS30HVJU Service Manual Download Page 107

Troubleshooting

SiUS04-924

100

Service Diagnosis

4.22 Output Overcurrent Detection

Remote 
Controller 
Display

L5

Method of 
Malfunction 
Detection

An output overcurrent is detected by checking the current that flows in the inverter DC section.

Malfunction 
Decision 
Conditions

A position signal error occurs while the compressor is running.

A speed error occurs while the compressor is running.

An output overcurrent input is fed from the output overcurrent detection circuit to the 
microcomputer.

The system will be shut down if the error occurs 16 times.

Clearing condition: Continuous run for about 5 minutes (normal)

Supposed 
Causes

Overcurrent due to defective power transistor

Overcurrent due to wrong internal wiring

Overcurrent due to abnormal supply voltage

Overcurrent due to defective PCB

Error detection due to defective PCB

Overcurrent due to closed stop valve

Overcurrent due to compressor failure

Overcurrent due to poor installation condition

Overcurrent due to outdoor unit fan lock

Summary of Contents for FTXS30HVJU

Page 1: ...SiUS04 924 Applied Models Inverter Pair Heat Pump Inverter Pair Wall Mounted Type H Series ...

Page 2: ...VJU Outdoor Units RXS30HVJU RXS36HVJU Inverter Pair H Series Part 1 List of Functions 1 1 List of Functions 2 Part 2 Specifications 3 1 Specifications 4 Part 3 Printed Circuit Board Connector Wiring Diagram 6 1 Printed Circuit Board Connector Wiring Diagram 7 1 1 Indoor Unit 7 1 2 Outdoor Unit 9 ...

Page 3: ...peTemperature Control 32 3 5 Input Current Control 33 3 6 Freeze up Protection Control 34 3 7 Heating Peak Cut Control 34 3 8 Fan Control 35 3 9 Liquid Compression Protection Function 2 35 3 10 Defrost Control 35 3 11 Electronic Expansion Valve Control 37 3 12 Malfunctions 40 3 13 Forced Operation Mode 41 3 14 Additional Functions 41 3 15 Facility Setting Switch cooling at low outdoor temperature ...

Page 4: ...ock 84 4 12 Input Overcurrent Detection 85 4 13 Four Way Valve Abnormality 86 4 14 Discharge Pipe Temperature Control 88 4 15 High Pressure Control in Cooling 89 4 16 Compressor System Sensor Abnormality 90 4 17 Position Sensor Abnormality 91 4 18 CT or Related Abnormality 93 4 19 Thermistor or Related Abnormality Outdoor Unit 95 4 20 Electrical Box Temperature Rise 97 4 21 Radiation Fin Temperatu...

Page 5: ... Removal of Fan Motor 173 2 5 Removal of Coils Thermistors 174 2 6 Removal of Sound Blanket 177 2 7 Removal of Compressor 180 Part 8 Other Considerations 182 1 Other Considerations 183 1 1 Trial Operation from the Remote Controller 183 1 2 Jumper Settings 184 1 3 Application of Silicon Grease to athe Power Transistor and a Diode Bridge 185 Part 9 Appendix 187 1 Piping Diagrams 188 2 Wiring Diagram...

Page 6: ...ant gas The refrigerant gas may cause frostbite Use only pipes flare nuts tools and other materials designed specifically for R410A refrigerant systems Never use tools or materials designed for R22 refrigerant systems on an R410A refrigerant system Doing so can cause a serious accident or an equipment failure Check to see if the parts and wires are mounted and connected properly and if the connect...

Page 7: ...If the power cable and lead wires have scratches or have become deteriorated have them replaced Damaged cable and wires may cause an electrical shock or fire Do not use a joined power cable or an extension cord or share the same power outlet with other electrical appliances as it may cause an electrical shock or fire Use an exclusive power circuit for the equipment Insufficient circuit amperage ca...

Page 8: ...SiUS04 924 List of Functions 1 Part 1 List of Functions 1 List of Functions 2 ...

Page 9: ...re 3 D Airflow Self Diagnosis Digital LED Display Comfort Airflow Mode Wiring Error Check Comfort Control Auto Fan Speed Anticorrosion Treatment of Outdoor Heat Exchanger Indoor Unit Quiet Operation Flexibility Multi Split Split Compatible Indoor Unit Night Quiet Mode Automatic Flexible Voltage Correspondence Outdoor Unit Quiet Operation Manual High Ceiling Application INTELLIGENT EYE Chargeless 3...

Page 10: ...SiUS04 924 Specifications 3 Part 2 Specifications 1 Specifications 4 ...

Page 11: ...ps Quiet Auto Air Direction Control Right Left Horizontal Downward Right Left Horizontal Downward Air Filter Removable Washable Mildew Proof Removable Washable Mildew Proof Running Current Rated A 0 38 0 34 0 38 0 34 0 38 0 34 0 38 0 34 Power Consumption Rated W 77 77 77 77 Power Factor Rated 97 4 98 5 97 4 98 5 97 4 98 5 97 4 98 5 Temperature Control Microcomputer Control Microcomputer Control Di...

Page 12: ...he data are based on the conditions shown in the table below Conversion Formulae kcal h kW 860 Btu h kW 3414 cfm m min 35 3 Cooling Heating Piping Length Indoor 80 FDB 67 FWB Outdoor 95 FDB 75 FWB Indoor 70 FDB 60 FWB Outdoor 47 FDB 43 FWB 25ft 7 5 m ...

Page 13: ...SiUS04 924 6 Printed Circuit Board Connector Wiring Diagram Part 3 Printed Circuit Board Connector Wiring Diagram 1 Printed Circuit Board Connector Wiring Diagram 7 1 1 Indoor Unit 7 1 2 Outdoor Unit 9 ...

Page 14: ...r 4 S32 Connector for heat exchanger thermistor 5 S41 Connector for swing motor 6 S46 Connector for display PCB 7 S47 Connector for signal receiver PCB 1 S48 Connector for control PCB 1 S49 Connector for control PCB 1 V1 Varistor 2 JA Address setting jumper JB Fan speed setting when compressor is OFF on thermostat JC Power failure recovery function auto restart Refer to page 184 for detail 3 LED A...

Page 15: ...SiUS04 924 8 Printed Circuit Board Connector Wiring Diagram PCB Detail PCB 1 Control PCB PCB 2 Signal Receiver PCB PCB 3 Display PCB 2P227881 1B S41 S47 JC JB S21 JA S46 S25 S1 S32 LED A FU1 V1 3P224121 1A S48 3P224121 1A RTH1 SW1 LED3 LED2 LED1 S49 ...

Page 16: ...or for overload protector 4 S51 S101 Connector for service monitor PCB 5 S70 Connector for fan motor 6 S80 Connector for four way valve coil 7 S90 Connector for thermistors outdoor air heat exchanger discharge pipe 8 AC1 AC2 Connector for terminal strip power supply 9 HR1 HR2 Connector for reactor 1 S52 S102 Connector for control PCB 1 FU1 Fuse 30A 2 FU2 FU3 Fuse 3 15A 1 LED A Service monitor LED ...

Page 17: ...ng Diagram SiUS04 924 10 Printed Circuit Board Connector Wiring Diagram PCB Detail PCB 1 Main PCB PCB 2 Service Monitor PCB R9653 AC1 FU2 3 15A AC2 HR1 HR2 FU1 30A S10 S80 S90 S20 S70 S40 S51 FU3 3 15A S101 S102 SW1 SW4 3P169059 LED A S52 ...

Page 18: ...ERFUL Operation 23 1 11 Other Functions 24 2 Function of Thermistor 26 3 Control Specification 27 3 1 Mode Hierarchy 27 3 2 Frequency Control 28 3 3 Controls at Mode Changing Start up 30 3 4 Discharge PipeTemperature Control 32 3 5 Input Current Control 33 3 6 Freeze up Protection Control 34 3 7 Fan Control 35 3 8 Liquid Compression Protection Function 2 35 3 9 Electronic Expansion Valve Control 3...

Page 19: ...r Features The inverter provides the following features The regulating capacity can be changed according to the changes in the outdoor air temperature and cooling heating load Quick heating and quick cooling Phase Description 1 The supplied AC power source is converted into a DC power source 2 The DC power source is reconverted into a three phase AC power source with variable frequency When the fr...

Page 20: ...the energy saving operation maintains the room temperature at low power Frequency Limits The following table shows the functions that define the minimum and maximum frequency Forced Cooling Operation For more information refer to Forced operation mode on page 41 60 120 300 113 F 45 C Air discharge temperature inverter normal heat pump Start seconds R9853 Frequency limits Limited during the activat...

Page 21: ...ns the auto swing process for heating cooling dry and fan modes 3 D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform airconditioning of the entire room This function is effective when starting the air conditioner When the horizontal swing and vertical swing are both set to auto mode the airflow becomes 3 D airflow by alternating the horizontal vertical swing ...

Page 22: ...d Cooling The fan keeps rotating at the set tap Heating The fan stops Dry The fan stops after rotating for a few minutes at LL tap Automatic Airflow Control for Heating In heating mode the indoor fan speed will be regulated according to the indoor heat exchanger temperature and the difference between the room temperature and the required set point Automatic Airflow Control for Cooling The followin...

Page 23: ... the microcomputer is divided into two zones Then the unit operates in the dry mode with an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable level Room temperature at startup Set temperature X Thermostat OFF point Y Thermostat ON point Z 75 F 24ºC or more Room temperature at startup X 4 5 F X 2 5ºC X 0 9 F X 0 5ºC or Y 0 9 F Y 0 5ºC zone B continues for ...

Page 24: ...ing temperature equals remote controller setting temperature 3 Mode switching points are as follows Heating Cooling switching point Room temperature Main unit setting temperature 5 4 F 3 0 C Cooling Heating switching point Room temperature Main unit setting temperature 4 5 F 2 5 C Thermostat ON OFF point is the same as the ON OFF point of cooling or heating operation 4 During initial operation Roo...

Page 25: ...one C after being in zone A 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 zone B Cooling Dry 10 minutes Heating 10 seconds Cooling Dry Heating B A OFF ON C Cooling 0 9 F 0 5 C Dry 0 9 F 0 5 C 2 7 F 1 5 C Room temperature set point Cooling 3 6 F 2 0 C Dry 4 5 3 6 F 2 5 ...

Page 26: ... the set temperature for the first hour then automatically raises the temperature setting slightly in the case of cooling or lowers it slightly in the case of heating for economical operations This prevents excessive heating in winter and excessive cooling in summer to ensure comfortable sleeping conditions and also conserves electricity Cooling Operation Heating Operation Temperature setting 0 9 ...

Page 27: ...n the unit is running Pressing the operation stop button causes the settings to be canceled This function and POWERFUL operation cannot be used at the same time The latest command has the priority Details ECONO mode can be activated while the unit is running The remote controller can send the ECONO command when the unit is in COOL HEAT DRY or AUTO operation When the ECONO command is valid the powe...

Page 28: ...ensor in 20 minutes it detects no presence is in the room and operates the unit at a temperature shifted 3 6 F 2 C from the set temperature Cooling Dry 3 6 F 2 C higher Heating 3 6 F 2 C lower and Auto according to the operation mode at that time 1 In case of Fan mode the fan speed reduces by 50 rpm If the sensor detects the outputs 10 times sec or more it judges humans are present 1sec sampling 2...

Page 29: ...na After this 40 minutes the prohibition of the thermostat off is cancelled and it resumes conditions to conduct thermostat off depending on the room temperature In or after this 40 minutes if the sensor detects the human motion detection signal it allows the set temperature and the fan speed to return to the original set point maintaining normal operation Others The dry operation cannot command t...

Page 30: ... Ex POWERFUL operation in cooling mode Operation mode Fan speed Target set temperature COOL H tap 50 rpm 64 F 18 C DRY Dry rotating speed 50 rpm Normally targeted temperature in dry operation Approx 3 6 F 2 C HEAT H tap 50 rpm 86 F 30 C FAN H tap 50 rpm AUTO Same as cooling heating in POWERFUL operation The target is kept unchanged R9862 Target temp Fan 50rpm Set temp 64 F 18 C POWERFUL ON POWERFU...

Page 31: ...to the following table Forced operation mode Forced operation mode is set by pressing the ON OFF button for between 5 to 9 sec while the unit is not operating See page 41 for the detail of Forced Operation Mode Note When the ON OFF button is pressed for 10 seconds or more the operation will be stopped 1 11 4 Titanium Apatite Photocatalytic Air Purifying Filter This filter combines the Air Purifyin...

Page 32: ...on and Control 25 1 11 7 WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week up to 28 settings in total ON OFF Temperature and Time items can be set Refer to WEEKLY TIMER Operation on page 60 for detail ...

Page 33: ... of the inner temperature of the compressor rises abnormally the operating frequency drops or the operation halts 2 The discharge pipe thermistor is used for detecting disconnection of the discharge thermistor C Indoor Heat Exchanger Thermistor 1 The indoor heat exchanger thermistor is used for controlling target discharge temperature The system sets a target discharge pipe temperature according t...

Page 34: ...at pump model Modes available are stop cooling includes drying and heating includes defrosting Note Unless specified otherwise an indoor dry operation command must be regarded as cooling operation Air conditioner control mode Forced operating mode Forced cooling for Pump Down Operation Normal operating mode Cooling Heating Defrosting Stop mode except for cooling heating modes by indoor command Pre...

Page 35: ... cooling 1 4 Indoor frequency command 2 Determine upper limit frequency Set a minimum value as an upper limit frequency among the frequency upper limits of the following functions Compressor protection input current discharge pipes Low Hz high pressure peak cutting freeze prevention defrost 3 Determine lower limit frequency Set a maximum value as an lower limit frequency among the frequency lower ...

Page 36: ... D value obtaining the fixed D value When the D value is small lower the frequency When the D value is large increase the frequency 3 Limit of frequency variation width When the difference between input current and input current dropping value is less than 1 0 A the frequency increase width must be limited 4 Frequency management when other controls are functioning When frequency is dropping Freque...

Page 37: ... 50 F 10 C Control A preheating for normal state Outside temperature 50 F 10 C Control B preheating of increased capacity Control A ON condition Discharge pipe temperature 42 8 F 6 C Fin temperature 185 F 85 C OFF condition Discharge pipe temperature 46 4 F 8 C Fin temperature 194 F 90 C Control B ON condition Discharge pipe temperature 50 9 F 10 5 C Fin temperature 185 F 85 C OFF condition Discha...

Page 38: ...r activating the four way valve by the operating frequency output which is more than a certain fixed frequency for a certain fixed time Detail Starting Conditions 1 The MRC W turns ON when the compressor starts for heating after the MRC W has been OFF with compressor halted 2 The MRC W turns OFF when the compressor starts for cooling after the MRC W has been ON with compressor running 3 The compre...

Page 39: ...agement within the Zones 55 4 F 13 C 35 6 F 2 C 33 8 F 1 C A D B 48 2 F 9 C 68 0 F 20 C 33 8 F 1 C discharge pipe temp C outdoor temp R9863 zone A zone B zone C zone D FCG 1 46 46 55 46 FCG 2 65 65 65 65 FCG 3 80 80 80 80 TCG 1 500 500 120 500 TCG 2 180 100 200 180 TCG 3 470 470 470 470 Frequency FCG3 FCG2 FCG1 TCG1sec TCG2sec TCG3sec Time R9864 Zone Control contents Stop zone When the temperature...

Page 40: ...z After this the output frequency is pulled down by 2Hz every second until it reaches the steady zone Keep zone The present maximum frequency goes on Reset zone Limit of the frequency is cancelled Stop zone After 2 5 seconds in this zone the compressor is stopped Limitation of current dropping and stop value according to the outdoor air temperature 1 In case the operation mode is cooling The curre...

Page 41: ...trol Outline During heating operation the signals being sent from the indoor unit allow the operating frequency limitation and prevent abnormal high pressure The signal from the indoor unit must be divided as follows Detail Conditions for Start Controlling Judge the controlling start with the indoor heat exchanger temperature Control in Each Zone The heat exchanger s intermediate indoor unit tempe...

Page 42: ...ons of the temperature of the outdoor air and outdoor heat exchanger Detail Operation stops depending on the outdoor air temperature Compressor operation turns OFF under the conditions that the system is in cooling operation and outdoor air temperature is below 10 4 F 12 C NOTE See Page 42 for low ambient cooling operation setting 3 10 Defrost Control Outline Defrosting is carried out by the cooli...

Page 43: ...cy Compressor Four way valve Fan Electronic expansion valve opening ON OFF ON OFF ON OFF 0 Hz 39 Hz 62 Hz 5 sec 350 pulse 400 pulse 450 pulse Initial opening PI control 5 sec 60 sec 60 sec 650 sec Max limit 120 sec R9868 Outdoor temp 3 32 F 0 C Outdoor temp 32 F 0 C ...

Page 44: ...abnormally high 5 Control when the discharge pipe thermistor is disconnected Detail Feedback Control 1 Discharge pipe temperature control R2833 Fully closed when power is turned ON Open control when starting Control of target discharge pipe temperature Pressure equalizing control Open control when starting Control of target discharge pipe temperature Defrost control FD 1 Pressure equalizing contro...

Page 45: ...charge temperature 3 11 6 Disconnection of the Discharge Pipe Thermistor Outline Disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the heat exchanger temperature If any are disconnected open the electronic expansion valve according to the outdoor air temperature and the operating frequency operate for 9 minutes and then stop After 3 minutes...

Page 46: ...ift 3 11 8 Target Discharge Pipe Temperature Control Obtain the target discharge pipe temperature from the indoor and outdoor heat exchanger temperature and adjust the electronic expansion valve opening so that the actual discharge pipe temperature becomes close to that temperature Indirect SH control using the discharge pipe temperature Determine a correction value of the electronic expansion val...

Page 47: ...rupted If the inverter current exceeds 30A the compressor is interrupted 3 12 3 Insufficient Gas Control Outline There are 2 ways of control to detect insufficient gas I Detecting by DC current If the DC current is below the specified value and the frequency is higher than 40 Hz it is regarded as insufficient gas The DC current is weak compared to the normal operation when gas is insufficient and ...

Page 48: ...mal and not in the 3 minute standby mode 2 The operating mode of the outdoor unit is the stop mode 3 The forced operation is ON The forced operation is allowed when the above and conditions are met Starting adjustment If the forced operation switch is pressed when the above conditions are met 1 Command frequency 55Hz 2 Electronic expansion valve opening It depends on the capacity of the operating ...

Page 49: ... operation will stop If the outdoor temperature rises the operation will start again Caution 1 If the outdoor unit is installed where the heat exchanger of the unit is exposed to direct wind provide a windbreak wall 2 Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off when using facility settings 3 Do not place humidifiers or other items that might rai...

Page 50: ...Control Specification SiUS04 924 Function and Control 43 ...

Page 51: ...Remote Controller 46 2 2 AUTO DRY COOL HEAT FAN Operation 48 2 3 Adjusting the Airflow Direction 50 2 4 COMFORT AIRFLOW Operation 52 2 5 INTELLIGENT EYE Operation 53 2 6 POWERFUL Operation 55 2 7 OUTDOOR UNIT QUIET Operation 56 2 8 ECONO Operation 57 2 9 TIMER Operation 58 2 10 WEEKLY TIMER Operation 60 ...

Page 52: ...tions to the user can reduce requests for servicing by 80 However proficient the installation and operating functions of the AC system are the customer may blame either the room air conditioner or its installation work because of improper handling The installation work and the handing over of the unit can only be considered complete when its handling has been explained to the user without using te...

Page 53: ...Instruction SiUS04 924 46 Operation Manual 2 Instruction 2 1 Remote Controller ...

Page 54: ...SiUS04 924 Instruction Operation Manual 47 operation ...

Page 55: ...Instruction SiUS04 924 48 Operation Manual 2 2 AUTO DRY COOL HEAT FAN Operation ...

Page 56: ...SiUS04 924 Instruction Operation Manual 49 ...

Page 57: ...CD and the louvers will begin to swing louvers horizontal blades louvers have reached the desire position The louvers will stop moving To adjust the fins vertical blades is no longer displayed on the LCD is no longer displayed on the LCD When the fins have reached the desired The fins will stop moving ...

Page 58: ...SiUS04 924 Instruction Operation Manual 51 fins fins fins fins angles Inside ...

Page 59: ...Instruction SiUS04 924 52 Operation Manual 2 4 COMFORT AIRFLOW Operation provides a comfortable airflow fin fin fin ...

Page 60: ...SiUS04 924 Instruction Operation Manual 53 2 5 INTELLIGENT EYE Operation fins above ...

Page 61: ...Instruction SiUS04 924 54 Operation Manual ...

Page 62: ...SiUS04 924 Instruction Operation Manual 55 2 6 POWERFUL Operation ...

Page 63: ...Instruction SiUS04 924 56 Operation Manual 2 7 OUTDOOR UNIT QUIET Operation ...

Page 64: ...SiUS04 924 Instruction Operation Manual 57 2 8 ECONO Operation ...

Page 65: ...Instruction SiUS04 924 58 Operation Manual 2 9 TIMER Operation ...

Page 66: ...SiUS04 924 Instruction Operation Manual 59 ...

Page 67: ...n Manual 2 10 WEEKLY TIMER Operation Examples of using the WEEKLY TIMER settings Up to 4 settings per day and 28 settings per week can be made with the WEEKLY TIMER The effective use of the copy mode ensures the ease of making settings ...

Page 68: ...SiUS04 924 Instruction Operation Manual 61 The day of the week and the setting number is displayed changes the setting number and the day of the week and the setting number ...

Page 69: ...Instruction SiUS04 924 62 Operation Manual ...

Page 70: ...SiUS04 924 Instruction Operation Manual 63 ...

Page 71: ...Instruction SiUS04 924 64 Operation Manual ...

Page 72: ...SiUS04 924 Instruction Operation Manual 65 3P228444 2B ...

Page 73: ... Outdoor Unit PCB Abnormality 81 4 9 OL Activation Compressor Overload 82 4 10 Compressor Lock 83 4 11 DC Fan Lock 84 4 12 Input Overcurrent Detection 85 4 13 Four Way Valve Abnormality 86 4 14 Discharge Pipe Temperature Control 88 4 15 High Pressure Control in Cooling 89 4 16 Compressor System Sensor Abnormality 90 4 17 Position Sensor Abnormality 91 4 18 CT or Related Abnormality 93 4 19 Thermis...

Page 74: ...hermistor malfunctions disabling equipment operation 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 Location of Operation Lamp Troubleshooting with the LED Indication The outdoor unit has one green LED LED A on the PCB The flashing green LED indicates normal condition of microcomputer o...

Page 75: ...l and cooling operation cannot be used when the outside temperature is below 10 4 F 12 C Diagnosis with remote controller indication 72 Equipment operates but does not cool or does not heat only for heat pump model Check for wiring and piping errors in the indoor and outdoor units connection wires and pipes Conduct the wiring piping error check described on the product diagnosis nameplate Check fo...

Page 76: ...nd notifies with a long beep Note 1 A short beep and two consecutive beeps indicate non corresponding codes 2 To cancel the code display hold the timer cancel button down for 5 seconds The code display also cancels itself if the button is not pressed for 1 minute No Code No Code No Code 1 00 13 C7 25 UA 2 U4 14 A3 26 UH 3 L5 15 H8 27 P4 4 E6 16 H9 28 L3 5 H6 17 C9 29 L4 6 H0 18 C4 30 H7 7 A6 19 C5...

Page 77: ...e figure until you hear the sound of beep 3 Diagnose by the sound beep The left side numeral is incorrect move to the next number beep beep The right side number is incorrect move to the next number long beeeeep Both numbers are correct this is your error code Refer to the troubleshooting section to learn more about his code See 7 4 Press the MODE button The right side numeral blinks R8381 R9430 R...

Page 78: ...eep Both the right left numerals are the correct error codes designators 7 Determine the error code The figure indicated when you hear the long beep sound is the error code Error codes and description Refer to page 72 8 Press the MODE button to exit from the diagnosis mode The display means the trial operation mode Refer to page 183 for trial operation 9 Press the ON OFF button twice to return to ...

Page 79: ...e thermistor abnormality 78 Outdoor Unit E1 Outdoor unit PCB abnormality 81 E5 OL activation compressor overload 82 E6 Compressor lock 83 E7 DC fan lock 84 E8 Input overcurrent detection 85 EA Four way valve abnormality 86 F3 Discharge pipe temperature control 88 F6 High pressure control in cooling 89 H0 Compressor system sensor abnormality 90 H6 Position sensor abnormality 91 H8 CT or related abn...

Page 80: ... cross detection in approximately 10 continuous seconds Supposed Causes Faulty indoor unit PCB Faulty connector connection Troubleshooting Note Connector Nos vary depending on models Connector connection check note Is it normal YES NO R7130 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur Correct connections Replace PCB Model T...

Page 81: ...ding to the temperature detected by the indoor unit heat exchanger thermistor Malfunction Decision Conditions High pressure control During heating operations the temperature detected by the indoor heat exchanger thermistor is above 149 F 65 C Freeze up protection When the indoor unit heat exchanger temperature is below 32 F 0 C during cooling operation Supposed Causes Operation halt due to clogged...

Page 82: ...g or disconnecting the connector or parts damage may occurr Provide sufficient air passage Clean the air filter Clean the heat exchanger Replace the indoor unit PCB Replace the thermistor replace the indoor unit PCB Does it conform to the thermistor characteristic chart Check the intake air filter Check the dust accumulation on the indoor unit heat exchanger Is there any short circuit Is it very d...

Page 83: ...nction Decision Conditions When 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 Operation halt due to short circuit inside the fan motor winding Operation halt due to breaking of wire inside the fan motor Operation halt due to breaking of the fan motor lead wires Operation halt due ...

Page 84: ...e connecting or disconnecting the connector or parts damage may occur Replace the fan motor Replace the indoor unit PCB 1 Replace the indoor unit PCB 1 Note The motor may break when the motor connector is disconnected while remaining powered Replace the fan motor Replace the indoor unit PCB 1 Replace the indoor unit PCB 1 Replace the fan motor Replace the fan motor and indoor PCB 1 Does the fan ro...

Page 85: ...an 1 860 k Note The values vary slightly in some models Supposed Causes Faulty connector connection Faulty thermistor Faulty PCB Troubleshooting Check No 06 Refer to P 108 C4 Heat exchanger thermistor C9 Room temperature thermistor Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur Check the indoor and outdoor unit model numbers ...

Page 86: ...n the indoor and outdoor units wire No 3 Short circuit inside the fan motor winding Troubleshooting Check No 10 Refer to P 110 Check the voltage of the indoor unit outdoor unit connection wires between No 1 and No 3 and Check No 10 Check power supply waveform YES YES Replace indoor unit control PCB Locate the cause of the disturbance of the power supply waveform and correct it NO R8300 NO YES YES ...

Page 87: ... Causes Wrong models interconnected Wrong indoor unit PCB mounted Indoor unit PCB defective Wrong outdoor unit PCB mounted or defective Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur Check the indoor and outdoor unit model numbers R8308 YES NO NO YES Check the code numbers 2P01234 for example of the indoor and...

Page 88: ...r Supposed Causes Out of control of microcomputer caused by external factors Noise Momentary drop in voltage Momentary power loss Defective outdoor unit PCB Troubleshooting R7183 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur YES NO NO YES Power on again Check to see that the machine is grounded Replace the outdoor unit PCB C...

Page 89: ...oting Check No 04 Refer to P 106 Check No 05 Refer to P 107 Check No 06 Refer to P 108 Check No 11 Refer to P 110 R7137 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur YES Malfunctioning Discharge pipe thermistor NO Functioning Functioning Malfunctioning Refrigerant shortage Water mixed Stop valve defective Malfunctioning Func...

Page 90: ...isconnected Troubleshooting Turn off the power Disconnect the harnesses U V and W R8065 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur NO YES YES NO NO YES Check with the inverter checker Turn off the power and reconnect the harnesses Turn on the power Precaution before turning on the power again Make sure the power has been ...

Page 91: ...or about 5 minutes normal Supposed Causes Fan motor breakdown Harness or connector disconnected between fan motor and PCB or in poor contact Foreign matter stuck in the fan Troubleshooting Check No 15 Refer to P 112 R7139 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur YES YES NO YES NO NO Get started Check No 15 Check the out...

Page 92: ...PCB Overcurrent due to short circuit Troubleshooting Check No 07 Refer to P 109 Check No 08 Refer to P 109 R9298 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur An input overcurrent may result from wrong internal wiring If the wires have been disconnected and reconnected for part replacement for example and the system is inter...

Page 93: ...ges in the operating mode Malfunction Decision Conditions A following condition continues over 1 minute after operating 10 minutes Cooling dry operation room temp indoor heat exchanger temp 9 F 5 C Heating indoor unit heat exchanger temp room temp 9 F 5 C The system will be shut down if the cooling heating changeover abnormality occurs 5 times Supposed Causes Connector in poor contact Thermistor d...

Page 94: ...the continuity of the four way valve coil and harness Check No 05 Check the four way valve switching output Any thermistor disconnected Check No 06 Check the thermistors Check No 11 Check the refrigerant line Disconnect the harness from the connector Resistance between harnesses about 1500 W Harness out of connector Four way valve coil disconnected loose YES Functioning YES NO NO NO Functioning Ma...

Page 95: ...malfunctioning Discharge pipe thermistor defective heat exchanger or outdoor temperature thermistor defective Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Stop valve defective Troubleshooting Check No 04 Refer to P 106 Check No 06 Refer to P 108 Check No 11 Refer to P 110 248 0 F 120 C 224 6 F 107 C R7141 Caution Be sure to turn off the power swit...

Page 96: ...y stop valve Dirty heat exchanger Foreign matter stuck in the outdoor unit fan Troubleshooting Check No 04 Refer to P 106 Check No 06 Refer to P 108 Check No 07 Refer to P 109 Check No 09 Refer to P 110 R7142 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur Replace the fan motor Repair the connector or fan motor lead wires Repl...

Page 97: ...tive Compressor defective Troubleshooting Connect properly R7174 NO YES Connect properly NO YES Replace the reactor NO YES Replace the compressor or the compressor relay harness Check the operation again and if the error appears again replace the outdoor unit PCB NO YES Disconnect the reactor from the outdoor unit PCB and measure the resistance value between reactor terminals with tester Disconnec...

Page 98: ...gh the position detection circuit Malfunction Decision Conditions The compressor fails to start in about 15 seconds after the compressor run command signal is sent Clearing condition Continuous run for about 5 minutes The system will be shut down if the error occurs 8 times Supposed Causes Compressor relay cable disconnected Compressor itself defective Outdoor unit PCB defective Stop valve closed ...

Page 99: ... the inverter checker Turn off the power Disconnect the harnesses U V and W Check the electrolytic capacitor voltage Electricals or compressor harnesses connected as specified Replace the outdoor unit PCB Replace the compressor Correct the power supply or replace the outdoor unit PCB Reconnect as specified Replace the outdoor unit PCB outdoor unit fan Inverter checker Part No 1225477 Normal DC325 ...

Page 100: ...Malfunction Decision Conditions The compressor running frequency is below 32 Hz The input current is also below 0 5 A If this error repeats 4 times the system will be shut down The error counter will reset itself if this or any other error does not occur during the following 60 minute compressor running time total time Supposed Causes Power transistor defective Internal wiring broken or in poor co...

Page 101: ...ff the power Disconnect the harnesses U V and W Turn off the power and reconnect the above harnesses Then turn on the power again and get the system restarted Compressor running DC325 50V Any LED off Running current as shown at right with relay cable 1 or 2 Voltage within the allowable range Supply voltage 15 Replace the outdoor unit PCB Replace the outdoor unit PCB Replace the outdoor unit PCB Ch...

Page 102: ...ure Malfunction Decision Conditions The thermistor input is above 4 96 V or below 0 04 V with the power on Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor temperature Supposed Causes Connector in poor contact Thermistor defective Outdoor unit PCB defective Indoor unit PCB defective Heat exchanger thermistor defective in the case of J3 error ...

Page 103: ...the power again Normal Reconnect Reconnect Replace defective one s of the following thermistors Radiation fin thermistor Discharge pipe thermistor Outdoor heat exchanger thermistor Outdoor air thermistor Indoor heat exchanger thermistor Replace the following thermistor Replace the outdoor unit PCB Replace the indoor unit PCB Connector or thermistor disconnected Error displayed again on remote cont...

Page 104: ...tdoor unit fan Troubleshooting Check No 07 Refer to P 109 Check No 09 Refer to P 110 R9294 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur YES NO Slightly dirty Malfunctioning Too dirty Functioning NO YES WARNING To cool down the electricals the outdoor unit fan gets started when the radiation fin temperature rises above 185 F...

Page 105: ...e drops below 206 6 F 97 C If a radiation fin temperature rise takes place 4 times successively the system will be shut down The error counter will reset itself if this or any other error does not occur during the following 60 minute compressor running time total time Supposed Causes Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short circuit Fin thermistor def...

Page 106: ...urn it on again to get the system started Check the radiation fin temperature Check No 07 Check the installation condition NO YES YES Radiation fin dirty Above its stop level Check No 09 Check the outdoor unit fan or related Error displayed again Has PCB been replaced Check if the silicon grease applied properly on the radiation fin If not apply it Note 1 Check the power transistor and fin for loo...

Page 107: ...tput overcurrent input is fed from the output overcurrent detection circuit to the microcomputer The system will be shut down if the error occurs 16 times Clearing condition Continuous run for about 5 minutes normal Supposed Causes Overcurrent due to defective power transistor Overcurrent due to wrong internal wiring Overcurrent due to abnormal supply voltage Overcurrent due to defective PCB Error...

Page 108: ...stem is interrupted by an output overcurrent take the following procedure Check No 08 Check the discharge pressure Check No 13 Check the power transistor Check No 07 Check the installation condition Check with the inverter checker Turn off the power and disconnect the harnesses U V and W Turn off the power and reconnect the harnesses Turn on the power Turn off the power and turn it on again to get...

Page 109: ...uency 40 Hz is kept on for a certain time Note The values are different from model to model Gas shortage detection II Electronic expansion valve opening pulse Discharge pipe temperature C target discharge pipe temperature C C If a gas shortage error takes place 4 times successively the system will be shut down The error counter will reset itself if this or any other error does not occur during the...

Page 110: ...onic expansion valve functioning Replace in position Open the stop valve Repair the pipe flare or replace the square union Check the power transistor harness for looseness Correct it as required Also replace cracked pipe if any Check the pipes for improper contact Correct as required Also replace cracked pipe if any Replace the electronic expansion valve Replace the room temperature or outdoor air...

Page 111: ...d Causes Supply voltage not as specified Over voltage detector or DC voltage detection circuit defective PAM control part s defective Short circuit inside the fan motor winding Troubleshooting Correct the power supply Replace the PM1 Check for such factors long term Try to get restarted a couple of times R7179 Caution Be sure to turn off the power switch before connecting or disconnecting the conn...

Page 112: ...successively for 9 seconds The abnormality is determined if the above fault conditions occur once Fault counter is reset when the data from the PM1 can be successfully received Supposed Causes Defective outdoor unit PCB Troubleshooting R7185 Caution Be sure to turn off the power switch before connecting or disconnecting the connector or parts damage may occur NO YES Turn off the power and turn it ...

Page 113: ...at connector and check the conductivity using a tester Check the conductivity between pins 1 2 3 4 and 6 If there is no conductivity between the pins the EV coil is faulty 4 If no EV generates latching sound in the above step 2 the outdoor unit PCB is faulty 5 If the conductivity is confirmed in the above step 3 mount a good coil which generated latching sound in the EV unit that did not generate ...

Page 114: ...ff the power and turn it on again Disconnect the four way valve coil from the connector and check the continuity Start the heating mode run Four way valve coil Cooling dry No continuity Heating Continuity Replace the outdoor unit PCB Replace the four way valve coil Replace the four way valve Four way valve coil resistance at S80 voltage at with compressor on ...

Page 115: ...ween normal temperature and resistance is shown in the graph and the table below For the models in which the thermistor is directly mounted on the PCB Thermistor R25 C 77 F 20k B 3950 Temperature C F 20 4 211 0 k 15 5 150 10 14 116 5 5 23 88 0 32 67 2 5 41 51 9 10 50 40 15 59 31 8 20 68 25 25 77 20 30 86 16 35 95 13 40 104 10 6 45 113 8 7 50 122 7 2 R9870 R25 C 77 F 20kΩ B 3950 5 32 59 86 113 C F ...

Page 116: ...air temperature Change the position of the air discharge grille or the installation location Change the position of the air discharge grille or the installation location Change the installation location or direction Check the outside air temperature temperature of air taken in by the outdoor unit The outside air temperature shall be 114 8 F 46 C or lower Clean the heat exchanger R7158 Not dirty YE...

Page 117: ...f there is waveform disturbance near the zero cross sections circled in Fig 2 5 1 9 Inverter Units Refrigerant System Check Check No 11 R7159 YES YES NO NO Outdoor unit fan system functioning Check the outdoor unit fan system Go to Check No 15 Outdoor unit fan running Fan motor lead wire connector disconnected Reconnect Fig 1 Fig 2 Refrigerant system check Check for gas leaks See the section on in...

Page 118: ...ff the circuit breaker If unavoidably necessary to touch a live part make sure the power transistor s supply voltage is below 50 V using the tester For the UVW make measurements at the Faston terminal on the board or the relay connector OL lead wire Thermistor lead wire Fan motor lead wire Electronic expansion valve lead wire Reversing solenoid valve lead wire Heat pump type only Compressor lead w...

Page 119: ...e connector S70 4 Turn the fan motor with your hand to ensure the pulse 0 15 V appears twice at pins 1 and 4 If the fuse for fan motor protection has blown out the outdoor unit fan may also be malfunctioning Check the fan too If the voltage in Step 2 is not applied it means the PCB is defective Replace the PCB If the pulse in Step 4 is not available it means the Hall IC is defective Replace the DC...

Page 120: ... 5 Removal of Horizontal Blades Louvers Vertical blades Fins Swing Mo tors135 1 6 Removal of Fan Motor 143 1 7 Removal of Heat Exchanger 146 1 8 Removal of Fan Rotor 150 2 Outdoor Unit 152 2 1 Removal of Outer Panels 152 2 2 Removal of the Electrical Box 166 2 3 Removal of PCB 170 2 4 Removal of Fan Motor 173 2 5 Removal of Coils Thermistors 174 2 6 Removal of Sound Blanket 177 2 7 Removal of Comp...

Page 121: ...blinks 2 Removal of the air filters The 3 filters are interchangeable Set the air filters with displaying FRONT on the front side Set the air filters on the hooks of the front grille ASSY 1 Hold the front panel by the tabs on the both sides and lift it until it stops with a click 2 Lift an air filter upwards slightly by the center knob and then pull it out downwards R9473 ON OFF INVERTER R9474 Ope...

Page 122: ... purifying filter frame by unfastening the projections from the back of the air filter frame The 3 filters are interchangeable 2 Remove the Titanium apatite photocatalytic air purifying filter from its frame Step Procedure Points R9477 Titanium apatite photocatalytic air purifying filter Air filter R9478 Frame Titanium apatite photocatalytic air purifying filter ...

Page 123: ...nel further than it stops release both axes and remove the front panel Slide the front panel side to side to release each axis Align the right and left axes with grooves in turn and insert them to the end when installing 2 Remove the front panel Step Procedure Points R9479 Front Panel R9480 R9481 R9482 ...

Page 124: ...plies before disassembly work Step Procedure Points 1 Removal of the service cover 1 Remove the screw and remove the service cover No field setting switch is inside it You can remove the front grille without detaching the service cover 2 Removal of the front grille 1 Remove the 3 fixing screws of the front grille R9483 Service cover R9484 R9485 Front grille ...

Page 125: ...it 118 Removal Procedure 2 Release the 4 hooks on the top of the front grille Refer to the removal procedure in a reverse way when reassembling 3 Remove the 3 fixing screws Step Procedure Points R9486 Hook R9487 Hook R9488 ...

Page 126: ...ures The Illustration shows the left fixture 5 Pull the upper part of the front grille out and lift the lower part up and then remove the front grille Make sure that all the hooks are placed securely when reassembling Step Procedure Points R9489 Front grille fixture R9490 R9492 ...

Page 127: ...ng off all power supplies before disassembly work Step Procedure Points 1 Removal of the front grille Parts layout Parts layout 2 Removal of the drip proof plate 1 Remove the screw 2 Remove the drip proof plate from the heat exchanger When reassembling fit the hole to the heat exchanger 1 2 3 R9493 1 2 3 R9494 Drip proof plate R9496 R9495 ...

Page 128: ...indoor heat exchanger thermistor and the ground 1 Remove the screw and release the ground 2 Pull out the indoor heat exchanger thermistor Be careful not to lose the clip for the thermistor Step Procedure Points 1 2 3 R9497 Ground 1 2 3 R9498 Indoor heat exchanger ...

Page 129: ...hing the terminal strip board 1 Disconnect the 4 connection wirings Remove the screw and remove the wire retainer 2 Disconnect the connector for fan motor S1 and release the harness from the hook 3 Release the ferrite core Step Procedure Points 1 2 3 R9499 Terminal strip board Wire retainer 1 2 3 R9500 S1 R9501 Ferrite core ...

Page 130: ...24 Removal Procedure 123 4 Disconnect the connector for swing motor S41 5 Release the harness from the hooks 6 Release the fixing screw of the electrical box Step Procedure Points R9502 S41 R9503 1 2 3 R9504 Electrical box ...

Page 131: ...he bottom to remove Fit the back hook of the electrical box to the bottom frame when reassembling 8 Push the shelter up and undo the hooks 9 Open the shelter The shelter has the 2 hooks at the lower part Step Procedure Points R9505 R9647 Bottom frame Hook R9506 Shelter R9507 R9508 ...

Page 132: ...Indoor Unit SiUS04 924 Removal Procedure 125 10 Remove the shelter 11 Internal layout Step Procedure Points R9509 R9510 ...

Page 133: ...SiUS04 924 Indoor Unit 126 Removal Procedure 12 Remove the screw of the terminal strip board 13 Remove the terminal strip board 1 hook at the back Step Procedure Points R9511 R9512 Terminal strip board ...

Page 134: ...re to wait 10 minutes or more after turning off all power supplies before disassembly work Step Procedure Points 1 Removal the control PCB 1 Cut the clamp 2 Release the harness from the hook When reassembling make sure to hook the wiring 3 Push and release the hook R9513 Clamp R9514 R9515 ...

Page 135: ...Removal Procedure 4 Open the receiver unit Remove the receiver unit by releasing the hook 5 Release the 3 hooks Lift up and remove the control PCB 6 Pull out the ground wire Step Procedure Points R9516 R9517 Hook Hook R9518 Earth ...

Page 136: ...minal strips 8 Control PCB S1 To DC fan motor S21 To centralized control HA S25 To INTELLIGENT EYE S41 To swing motor S46 To display PCB S47 To signal receiver PCB Refer to P 8 for detail Step Procedure Points R9519 Terminal strips R9680 S1 S32 S41 S46 S25 S21 S47 ...

Page 137: ...er PCB 1 Release the hook on the right The signal receiver PCB will be lifted up 2 Remove the signal receiver PCB Remove the signal receiver PCB as the upper hook centers 3 Disconnect the connecter To control PCB Step Procedure Points R9520 Signal receiver PCB R9521 R9522 S48 ...

Page 138: ...e right Remove the INTELLIGENT EYE sensor as the 2 hooks on the left come center 2 Remove the sensor from the shield plate When reassembling set the sensor at the position where it clicks Otherwise the sensor is not completely set Step Procedure Points R9523 INTELLIGENT EYE sensor R9524 R9525 Sensor Shield plate ...

Page 139: ...e 3 Remove the shield plate rear by releasing the 2 hooks 4 Disconnect the connector S36 4 Removal of the display PCB 1 Release the 4 hooks Step Procedure Points R9526 Shield plate rear INTELLIGENT EYE sensor PCB Hook R9527 S36 R9528 Display PCB ...

Page 140: ...Indoor Unit SiUS04 924 Removal Procedure 133 2 Lift up the display PCB 3 Release the harness Step Procedure Points R9529 R9530 ...

Page 141: ...04 924 Indoor Unit 134 Removal Procedure 4 Disconnect the connector S49 To control PCB Step Procedure Points R9531 S49 3P224121 1 PbF S49 EX646 DISP REV 1 DPC B 94V 0 SW1 BZ LED1 LED2 LED3 GRN GRN R9532 S49 ...

Page 142: ...rocedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work Step Procedure Points 1 Removal of the horizontal blades 1 Hold the indoor unit up by a piece of wood etc 2 Remove the screw at the rear of the indoor unit 3 Remove the 2 screws front and rear R9568 R9533 R9534 ...

Page 143: ...ure 4 Remove the horizontal blades by releasing the hook and the protrusions Removing order Right hook left protrusion inner right protrusion inner left protrusion Step Procedure Points R9535 Horizontal blade right R9536 left R9537 inner right ...

Page 144: ...it SiUS04 924 Removal Procedure 137 2 Removal of the fan guards 1 Remove the sealing material horizontal 2 Remove the sealing material vertical 2 position Step Procedure Points R9538 inner left R9539 R9540 R9541 ...

Page 145: ... outlet assembly by pushing the 2 hooks at the back Remove the center and right air outlet assembly likewise 4 Remove the fan guards by releasing the 4 lower hooks and the 2 upper protrusions Step Procedure Points R9542 Air outlet ASSY R9543 Hook R9544 Fan guard R9545 ...

Page 146: ...39 3 Removal of the horizontal swing motors 1 Release the interlock rod 2 Pull out the drain hose then the swing motors can be removed 3 Remove the screw at the center Step Procedure Points R9546 Interlock rod R9547 Swing motor Drain hose R9548 ...

Page 147: ...hen reassembling set the swing motors in the correct order Otherwise they are not completely installed 1 Set the swing motor for upper blade first 2 Set the swing motor for lower blade 4 Removal of the vertical swing motor 1 Remove the link cover Step Procedure Points R9549 R9550 Swing motor lower blade Swing motor upper blade R9551 R9552 Link cover ...

Page 148: ...Indoor Unit SiUS04 924 Removal Procedure 141 2 Remove the interlock rod 2 with pliers 3 Remove the interlock rod 1 Step Procedure Points R9553 Interlock rod 2 R9554 R9555 Interlock rod 1 ...

Page 149: ...S04 924 Indoor Unit 142 Removal Procedure 4 Remove the 2 screws 5 Remove the swing motor for vertical blade 6 Disconnect the connector Step Procedure Points R9556 R9557 Swing motor for vertical blade R9558 ...

Page 150: ...o wait 10 minutes or more after turning off all power supplies before disassembly work Step Procedure Points 1 Loosen the fixing screw of the fan motor from the air outlet When the screw is loose enough the rotor can be moved 2 Remove the screw of the fan motor fixture R9559 R9560 Fan motor fixture ...

Page 151: ...r Unit 144 Removal Procedure 3 Remove the fan motor fixture by pushing the hook at the front 4 Release the harness from the hook and remove the screw of the motor mounting plate Step Procedure Points R9561 R9562 R9563 ...

Page 152: ...h as 0 2inch 5mm of play between the side face of the rotor and the bottom frame 6 Remove the fan motor 7 Remove the vibration absorber When reassembling engage the vibration absorber completely Step Procedure Points R9564 Motor mounting plate 0 2inch 5mm Side face of bottom frame Side face of rotor R9869 R9565 Fan motor R9567 R9566 Vibration absorber ...

Page 153: ...ecified refrigerant R 410A into refrigerant cycle Contaminating with air or other gas causes abnormal high pressure in refrigerating cycle and this results in pipe breakage or personal injuries Pay attention so that the residual water in the drain will not make the floor wet In case that a drain hose is buried inside a wall remove it after the drain hose in the wall is pulled out 1 Hold the indoor...

Page 154: ...dure 147 2 Removal of the piping fixture 1 Detach the indoor unit from the installation plate 2 Push the piping fixture assembly to release the piping fixture Step Procedure Points R9571 R9572 Piping fixture assembly R9573 Piping fixture ...

Page 155: ...8 Removal Procedure 3 Remove the piping fixture 3 Removal of the heat exchanger 1 Widen the auxiliary piping to the extent of 10 20 At an angle of 10 20 2 Remove the 2 screws on the left Step Procedure Points R9574 R9575 R9576 ...

Page 156: ...ft up and remove the heat exchanger Caution When removing or reinstalling heat exchanger be sure to wear protective gloves or wrap the heat exchanger with cloths Fins can cut fingers Press the right side of the heat exchanger and lift up from the left side Step Procedure Points R9577 R9578 Heat exchanger ...

Page 157: ...re disassembly work Step Procedure Points 1 Remove the right side panel 1 Remove the 2 screws You can remove the fan rotor without detaching the right side panel 2 Lift the right side panel and remove it 2 Removal of the fan rotor 1 Remove the screw of the fan motor fixture and remove the fixture Refer to P 143 R9579 Right side panel R9580 R9581 Fan motor fixture ...

Page 158: ... rotor and the bottom frame Insert the fan motor approx 0 2inch 5mm Tighten the screw until it stops Then turn the screw by one turn Move the fan rotor and confirm the fan motor and the fan rotor are installed appropriately Tighten the screw completely if appropriate If not appropriate go back to 4 Remove the fan rotor Step Procedure Points R9648 Fan rotor R9583 0 2inch 5mm Side face of bottom fra...

Page 159: ... after turning off all power supplies before disassembly work Step Procedure Points External appearance 1 Removal of the suction grille The hooks are secured in the clearances of the heat exchanger fins 1 Release the 3 hooks at the upper first and then 3 hooks at the middle 2 Release the 3 hooks at the bottom R9749 R9586 Suction grille R9587 ...

Page 160: ...924 Removal Procedure 153 2 Removal of the top panel 1 Remove the 7 screws and remove the top panel 3 Removal of the right side panel 1 Remove the 5 screws Step Procedure Points R9750 Top panel R9751 R9752 Right side panel ...

Page 161: ...US04 924 Outdoor Unit 154 Removal Procedure 2 Slide the panel downward to release 2 hooks on the back side 3 Remove the right side panel Step Procedure Points R9688 Hook Holes Hooks Hook Holes R9590 R9591 ...

Page 162: ...Outdoor Unit SiUS04 924 Removal Procedure 155 4 Removal of the front panel 2 1 Remove the 1 screw 2 Slide the panel downward to release the hook Step Procedure Points R9753 Front panel 2 R9754 R9755 ...

Page 163: ... inserted between the front panel 2 and the electrical box 5 Removal of the front panel 1 Remove the discharge grille and propeller fan first to remove the front panel 1 1 Remove the 4 screws on the discharge grille Step Procedure Points R9756 Insulation sheet R9757 Discharge grille Front panel 1 ...

Page 164: ...oor Unit SiUS04 924 Removal Procedure 157 2 Pull the bottom of the discharge grille toward you 3 Remove the propeller fan and the fixing nut Fan fixing nut M8 Step Procedure Points R9758 R9598 Propeller fan ...

Page 165: ...SiUS04 924 Outdoor Unit 158 Removal Procedure 4 Remove the 3 fixing screws on the partition plate 5 Remove the 2 screws at the bottom left of the front Step Procedure Points R9599 R9600 ...

Page 166: ...Outdoor Unit SiUS04 924 Removal Procedure 159 6 Remove the screw at the bottom of the left side 7 Remove the screw at the bottom of the back side Step Procedure Points R9601 R9602 ...

Page 167: ...SiUS04 924 Outdoor Unit 160 Removal Procedure 8 The front panel 1 is provided with a hook on its front Lift the front panel off position to remove it Step Procedure Points Hook R9603 ...

Page 168: ...1 9 Remove the front panel 1 The insulation sheet is inserted between the front panel 1 and the partition plate 6 Removal of the rear panel 1 Remove the 3 fixing screws on the partition plate 2 Step Procedure Points R9604 R9759 Partition plate 2 ...

Page 169: ...S04 924 Outdoor Unit 162 Removal Procedure 2 Lift up slightly and remove the partition plate 2 3 Remove the 3 screws 4 Remove the wire fixing plate Step Procedure Points R9760 R9607 R9608 Wire fixing plate ...

Page 170: ...Outdoor Unit SiUS04 924 Removal Procedure 163 5 Remove the 4 fixing screws on the partition plate 6 Remove the fixing screw from the bottom frame Step Procedure Points R9609 R9610 ...

Page 171: ...US04 924 Outdoor Unit 164 Removal Procedure 7 Remove the fixing screw from the shut off valve mounting plate 8 Lift the panel upward to release the 2 hooks and remove it Step Procedure Points R9612 R9613 ...

Page 172: ...moval Procedure 165 9 Push the hooks of the outdoor air thermistor from inner side 10 The outdoor air thermistor is now released 11 Remove the rear panel Step Procedure Points R9615 Outdoor air thermistor R9616 R9614 Rear panel ...

Page 173: ...it 10 minutes or more after turning off all power supplies before disassembly work Step Procedure Points 1 Remove the fixing screw from the shut off valve mounting plate 2 Remove the fixing screw on the partition plate 3 Remove the 2 screws to detach the ground wires R9617 R9618 Partition plate R9619 Earth wire ...

Page 174: ... 5 The illustration shows arrangement of the fan motor lead wire 6 Disconnect the connectors of the front side S20 electronic expansion valve coil S80 four way valve coil S90 thermistors discharge pipe outdoor air heat exchanger Step Procedure Points S70 Ferrite core R9620 When reassembling insert the clamp into the small hole Fixing position for ferrite core of fan motor R9878 Fixing position for...

Page 175: ...e harness and the compressor wire harness together from the partition 8 Pull out the clamp Detach the clamp Just pull the push mount type out of position 9 Disconnect the relay connector of the OL and the compressor Step Procedure Points R9623 Clamp R9624 Clamp R9625 ...

Page 176: ...r harness from the bottom of the electrical box 11 Slide the electrical box leftward to release the hook on the right side of the box 12 Lift up the electrical box to remove it Step Procedure Points R9626 When reassembling insert the clamp into the small hole R9627 Electrical box R9628 ...

Page 177: ...inutes or more after turning off all power supplies before disassembly work Step Procedure Points Remove the electrical box before hand 1 Remove the cover 2 Disconnect the connectors of the service monitor PCB for the control PCB S52 S102 3 Release the 4 clamps with pliers R9611 Service monitor PCB R9629 ...

Page 178: ...xing screw of the cable way board and disconnect the ground wire 5 Release the hook on the right 6 Open the cable way board 7 Disconnect the harnesses 1 Black 2 White 3 Red L1 Black L2 Brown N1 White N2 Blue Step Procedure Points Cable way board R5282 Earth wire ...

Page 179: ...tdoor Unit 172 Removal Procedure 8 Disconnect the 2 harnesses for the reactor HR1 HR2 9 Remove the 3 fixing screws for the main PCB 10 Release the 4 hooks 11 Lift up and remove the control PCB Step Procedure Points ...

Page 180: ...ut the clamps at 2 locations 2 3 Remove the 2 screws at the bottom first Next remove the 2 top screws Be sure to remove the bottom screws first If the top screws are removed first the fan motor the center of gravity of which is toward the front may tilt down or fall causing an injury 4 Remove the fan motor When reassembling be sure to place the wire harness lower R9630 R6442 2 1 R6443 Fan motor R6...

Page 181: ...e after turning off all power supplies before disassembly work Step Procedure Points 1 Removal of the electronic expansion valve coil 1 Pull the electronic expansion valve coil out of position 2 Removal of the thermistors 1 Pull out the heat exchanger thermistor R9631 Electronic expansion valve coil R9632 Heat exchanger thermistor ...

Page 182: ...al Procedure 175 2 Slightly open the sound blanket 3 Remove the sound blanket top upper 4 Remove the discharge pipe thermistor Step Procedure Points R9633 Sound blanket R9634 Sound blanket top upper R9635 Discharge pipe thermistor ...

Page 183: ...e outdoor air thermistor cover 6 Release the outdoor air thermistor 3 Removal of the four way valve coil 1 Remove the screw 2 Remove the four way valve coil Step Procedure Points R9636 Outdoor air thermistor cover R9637 Outdoor air thermistor R9638 R9639 Four way valve coil ...

Page 184: ...ng off all power supplies before disassembly work Step Procedure Points 1 Undo the 2 Velcro tapes the sound blanket and open the sound blanket outer sleeve 2 Remove the sound blanket top upper The sound blanket is fragile Carefully pass the discharge pipe through it R9640 Velcro tape Sound blanket outer sleeve R9641 Sound blanket top upper ...

Page 185: ...om the partition plate and open the plate slightly to the left for easy work 4 Remove the sound blanket outer sleeve The sound blanket is fragile Be careful of the notches of the compressor mount 3 locations Step Procedure Points R9642 R9643 Sound blanket outer sleeve ...

Page 186: ...d blanket inner sleeve and remove part of the muffler The sound blanket is fragile Be careful of the notches of the compressor mount 3 locations 6 Remove the sound blanket outer sleeve Step Procedure Points R9644 Sound blanket inner sleeve Compressor mount R9645 ...

Page 187: ...dure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work Step Procedure Points 1 Remove the terminal cover 2 Pull out the 3 leads using long nose pliers U red V yellow W blue 3 Remove the OL R9650 R9471 W blue U red V yellow OL ...

Page 188: ...the pipes be careful not to over tighten them with pliers The pipes may get deformed If the gas welding machine fails to remove the four way valve take the steps below 1 Disconnect the brazed pipe sections that are readily easy to separate and join together later 2 With a small copper tube cutter cut off the internal pipes to easily take out the four way valve Note Never use a metal saw The sawdus...

Page 189: ... Others Part 8 Other Considerations 1 Other Considerations 183 1 1 Trial Operation from the Remote Controller 183 1 2 Jumper Settings 184 1 3 Application of Silicon Grease to the Power Transistor and Diode Bridge 185 ...

Page 190: ...ration mode when the circuit breaker is opened again For Heat pump In cooling mode select the lowest programmable temperature in heating mode select the highest programmable temperature Trial operation may be disabled in either mode depending on the room temperature After trial operation is complete set the temperature to a normal level 78 F to 82 F 26 C to 28 C in cooling mode 68 F to 75 F 20 C t...

Page 191: ...4 tabs 4 Cut the address jumper JA on the control PCB Wireless remote controller 1 Slide the front cover and take it off 2 Cut the address jumper J4 1 2 2 Jumper Setting ADDRESS J4 EXIST CUT 1 2 J4 R9676 ADDRESS JA ADDRESS JA EXIST 1 CUT 2 R9677 Jumper On indoor control PCB Function When connected factory set When cut JC Power failure recovery function Auto restart Unit does not resume operation a...

Page 192: ...d the diode bridge Applying the paste should be implemented in accordance with the following instruction Remark There is the possibility of failure with smoke in case of bad heat radiation Completely wipe off the old silicon grease from the heat radiation fin Evenly apply the silicon grease to the whole diode bridge and power transistor Do not have any foreign object such as solder or paper waste ...

Page 193: ...SiUS04 924 187 Appendix Part 9 Appendix 1 Piping Diagrams 188 2 Wiring Diagrams 189 ...

Page 194: ...VE FILTER 5 8CuT STOP VALVE DC FAN MOTOR 5 16CuT ACCUMULATOR PROPELLER FAN 5 16CuT 3 8CuT LIQUID 3 8 CuT FIELD PIPING 5 8CuT 5 8CuT HEAT EXCHANGER 3 8CuT DISCHARGE PIPE COOLING FUSIBLE PLUG ON HEATING VALVE 4 WAY 5 16CuT 5 16CuT 3 8CuT 5 16CuT 5 16CuT 5 16CuT 5 8CuT 5 16CuT 5 16CuT 5 16CuT HEADER 3 8CuT FILTER THERMISTOR VALVE OPERATED MOTOR HEATING REFRIGERANT FLOW 5 8CuT THERMISTOR 1 4CuT RECEIV...

Page 195: ...8 PCB2 POWER SUPPLY Z1C Z3C BLU Y1R V100 GRN BLU MRC W S10 Z8C BLU RED U ORG RED SW1 L1 BLU BLU S102 ORG 2 1 PM1 M1F SW4 SW1 L1 L2 LOCAL SETTING SW SW4 FORCED OPERATION ON OFF SW SW1 LIVE CONDENSER BLK S2 BRN L2 GRY E2 M1C AC1 S52 BLU 3 1 1 6 WHT L2 TO INDOOR UNIT V S80 R3T t GRN BLU RED YLW S101 V3 Z5C Z6C X1M V2 9 5 YLW X2M 1 5 RED HR1 HR2 E1 E2 U V W X11A X12A AC1 AC2 FU1 FU2 FU3 SA2 V2 V3 V5 V...

Page 196: ... input on the outdoor unit pcb check 120 check no 01 114 check no 04 114 check no 05 115 check no 06 116 check no 07 117 check no 08 117 check no 09 118 check no 10 118 check no 11 118 check no 12 119 check no 13 119 check no 15 120 coils 183 comfort airflow mode 20 comfort airflow operation 59 compressor 189 compressor lock 91 compressor overload 90 compressor protection function 37 compressor sy...

Page 197: ... 11 13 fu2 13 fu3 13 functions list of 3 fuse 11 13 G gas piping 155 H h0 98 h6 99 h8 101 h9 103 ha 11 hall ic 20 84 heat exchanger 155 157 heat exchanger thermistor 86 183 high pressure control 82 high pressure control in cooling 97 horizontal blades 144 hot start function 29 hr1 13 hr2 13 I indoor heat exchanger thermistor 31 130 indoor unit pcb abnormality 81 input current control 38 input over...

Page 198: ...r 86 rth1 11 S s1 11 131 s10 13 s101 13 s102 13 s20 13 176 s21 11 s25 11 s32 11 s40 13 s41 132 s41 11 132 s46 11 s47 11 s48 11 s49 11 s51 13 s52 13 s70 13 176 s80 13 176 s90 13 176 sensor malfunction detection 45 service check function 77 service cover 126 service monitor pcb 14 shelter 133 side panel 162 signal receiver 123 signal receiver pcb 12 signal receiving sign 29 signal transmission error...

Page 199: ... input on the outdoor unit pcb check 120 U u0 110 u2 112 u4 87 u7 113 ua 88 unspecified voltage 88 V v1 11 varistor 11 vertical blades 144 voltage detection function 46 W weekly timer operation 30 66 wide angle louvres 19 wiring diagrams 200 ...

Page 200: ...onnector output check 114 four way valve abnormality 94 four way valve performance check 115 freeze up protection control 39 freeze up protection control or high pressure control 82 frequency control 33 frequency principle 17 H high pressure control in cooling 97 I indoor unit pcb abnormality 81 input current control 38 input over current detection 93 installation condition check 117 insufficient ...

Page 201: ...ease 195 T target discharge pipe temperature control 44 thermistor heat pump model 31 thermistor or related abnormality indoor unit 86 thermistor or related abnormality outdoor unit 103 thermistor resistance check 116 thermostat control 23 trial operation from remote controller 193 troubleshooting with the led indication 75 turning speed pulse input on the outdoor unit pcb check 120 U unspecified ...

Page 202: ...llton TX75006 info daikinac com www daikinac com AMERICAS Specifications designs and other content appearing in this brochure are current as of February 2010 but subject to change without notice SiUS04 924 Printed in U S A 02 2010 B AK ...

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