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Daikin FTXS50K3V1B [103/130] Thermistor resistance check
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SiBE041213E Check
Service Diagnosis 92
5. Check
5.1 Thermistor Resistance Check
Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of
each thermistor using tester.
The data is for reference purpose only.
When the room temperature thermistor is directly mounted on a PCB, remove the PCB from
the control PCB to measure the resistance.
When the connector of indoor heat exchanger thermistor is soldered on the PCB, remove
the thermistor and measure the resistance.
Thermistor temperature (°C) Resistance (kΩ)
–20 197.8
–15 148.2
–10 112.1
–5 85.60
0 65.93
5 51.14
10 39.99
15 31.52
20 25.02
25 20.00
30 16.10
35 13.04
40 10.62
45 8.707
50 7.176
(R25°C = 20 kΩ, B = 3950 K)
(kΩ)
150
100
50
–15 0 15 30 45
(˚C)
(R11905)
Tester
Resistance range
(R18296)
Tester
(R17417)
Room temperature
thermistor
Содержание
- Heat pump 2
- Indoor unit 2
- Inverter pair wall mounted type k series 2
- Outdoor unit 2
- Function of thermistor 4 3 control specification 5 3
- Functions 3
- Indoor unit 2 outdoor unit 3
- Introduction v 3
- Main functions 5 3
- Part 1 list of functions 3
- Part 2 specifications 3
- Part 3 printed circuit board connector wiring diagram 3
- Part 4 function and control 4 3
- Specifications 3
- Table of contents 3
- Check 2 4
- Part 5 remote controller 8 4
- Part 6 service diagnosis 1 4
- Problem symptoms and measures 3 3 service check function 4 4 troubleshooting 7 4
- Remote controller 9 4
- Troubleshooting with led 2 4
- Part 7 tips for servicing 03 5
- Part 8 appendix 12 5
- Piping diagrams 13 5
- Removal procedure booklet no 17 5
- Silicon grease on power transistor diode bridge 11 5
- Tips for servicing 04 5
- Trial operation 06 3 field settings 07 5
- Wiring diagrams 15 5
- Cautions regarding safety of workers 6
- Introduction 6
- Safety cautions 6
- Warning 6
- Caution 7
- Warning 7
- Caution 8
- Cautions regarding safety of users 8
- Warning 8
- Caution 9
- Warning 9
- Caution 10
- Icons are used to attract the attention of the reader to specific information the meaning of each icon is described in the table below 11
- Used icons 11
- Functions 12
- Part 1 list of functions 12
- Available not available 13
- Functions 13
- List of functions 2 13
- Sibe041213e functions 13
- Part 2 specifications 14
- Specifications 14
- Hz 220 230 240 v 15
- Sibe041213e specifications 15
- Specifications 15
- Specifications 4 15
- Hz 220 230 240 v 16
- Specifications 16
- Specifications sibe041213e 16
- Indoor unit 2 outdoor unit 17
- Part 3 printed circuit board connector wiring diagram 17
- Indoor unit 18
- Outdoor unit 20
- Rxs35k2v1b 20
- Rxs42k2v1b 22
- Rxs50k2v1b 23
- Function of thermistor 4 3 control specification 5 25
- Main functions 5 25
- Part 4 function and control 25
- Frequency principle 26
- Main functions 26
- Temperature control 26
- Comfortable air conditioning a fine adjustment is integrated to keep the room temperature constant 27
- Drawing of inverter the following drawing shows a schematic view of the inverter principle 27
- Energy saving heating and cooling once the set temperature is reached the energy saving operation enables to maintain the room temperature at low power 27
- Even during extreme cold weather high capacity is achieved it is maintained even when the outdoor temperature is 2 c 27
- Forced cooling operation refer to page 104 for detail 27
- Frequency limits the following functions regulate the minimum and maximum frequency 27
- Inverter features the inverter provides the following features 27
- Quick heating and quick cooling the rotation speed of the compressor is increased when starting the heating or cooling this enables to reach the set temperature quickly 27
- The regulating capacity can be changed according to the changes in the outdoor temperature and cooling heating load 27
- Airflow direction control 28
- Fan speed control for indoor unit 29
- Detail the microcomputer automatically sets the temperature and airflow rate the difference between the room thermistor temperature at start up and 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 30
- Outline program dry operation removes humidity while preventing the room temperature from lowering since the microcomputer controls both the temperature and airflow rate the temperature adjustment and fan setting buttons are inoperable 30
- Program dry operation 30
- Y 0 ºc 30
- Zone a thermostat off 30
- Zone b zone b 30
- Zone c thermostat on 30
- Automatic operation 31
- Detail thermostat off condition 32
- Function and control 32
- Main functions sibe041213e 32
- Outline thermostat control is based on the difference between the room thermistor temperature and the target temperature 32
- Refer to temperature control on page 15 for detail 32
- The monitoring time has passed while the temperature difference is in the zone b cooling dry 10 minutes heating 10 seconds 32
- The operation turns on in any zones except a 32
- The system resumes from defrost control in any zones except a 32
- The temperature difference is in the zone a 32
- The temperature difference returns to the zone c after being in the zone a 32
- Thermostat control 32
- Thermostat on condition 32
- Detail the night set mode continues operation at the target temperature for the first one hour then automatically raises the target temperature slightly in the case of cooling or lowers it slightly in the case of heating this prevents excessive cooling in summer and excessive heating in winter to ensure comfortable sleeping conditions and also conserves electricity 33
- Function and control 22 33
- Night set mode 33
- Outline when the off timer is set the night set mode is automatically activated the night set mode keeps the airflow rate setting 33
- Sibe041213e main functions 33
- 80 rpm 34
- Detail 34
- Detail when the powerful button is pressed the fan speed and target temperature are converted to the following states for 20 minutes 34
- Econo operation 34
- Ex powerful operation in cooling 34
- Inverter powerful operation 34
- Outline econo operation reduces the maximum operating current and the power consumption this operation is particularly convenient for energy saving oriented users it is also a major bonus for those whose breaker capacities do not allow the use of multiple electrical devices and air conditioners 34
- Outline in order to exploit the cooling and heating capacity to full extent operate the air conditioner by increasing the indoor fan rotating speed and the compressor frequency 34
- 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 is running pressing the on off button on the remote controller cancels the function 34
- This function and powerful operation cannot be used at the same time the latest command has the priority 34
- When this function is activated the maximum capacity also decreases 34
- Area intelligent eye operation 35
- Area intelligent eye sensor is divided into 2 areas and detects humans in each area 35
- Detail 1 detection method of intelligent eye 35
- Function and control 24 35
- Image of 2 area intelligent eye 35
- Outline the following functions can be performed by a motion sensor intelligent eye 1 reduction of the capacity when there is nobody in the room in order to save electricity energy saving operation 2 dividing the room into plural areas and detecting existence of humans in each area moving the airflow direction to the area with no human automatically to avoid direct airflow on humans 35
- Sibe041213e main functions 35
- The microcomputer in the indoor unit carries out a sampling every 20 msec and if it detects 10 cycles of the wave in one second in total corresponding to 20 msec 10 200 msec and when the on signal continues 3 sec it judges human is in the room as the motion signal is on 35
- This sensor detects human motion by receiving infrared rays and displays the pulse wave output 35
- Airflow direction in 2 area intelligent eye operation 36
- Area a area b 36
- Detection method the opposite area of detected area is set as the target direction 36
- Detection signal on in both area a and b shift the airflow direction to area b left side 2 detection signal on in area a shift the airflow direction to area b left side 3 detection signal on in area b shift the airflow direction to area a right side 4 detection signal off in both area a and b no change 36
- For dry operation you cannot set the temperature with remote controller but internally the target temperature is shifted 36
- Function and control 36
- In case of fan operation the fan speed reduces by 60 rpm 36
- Indoor unit 36
- Left right 36
- Main functions sibe041213e 36
- Motions for example in cooling 36
- Others 36
- Top view 36
- When the detection signal is off for 20 minutes in both area a and b the unit starts energy saving operation 36
- When the microcomputer does not have a signal from the sensor in 20 minutes it judges that nobody is in the room and operates the unit in temperature shifted from the target temperature cooling dry 1 2 c higher heating 2 c lower auto according to the operation mode at that time 36
- Clock setting 37
- Detail 38
- Outline up to 4 timer settings can be saved for each day of the week up to 28 settings in total the 3 items on off temperature and time can be set 38
- Using in these cases of weekly timer 38
- Weekly timer operation 38
- Press to select the desired day of the week and reservation number 39
- Press to select the desired mode 39
- To use weekly timer operation 39
- Press to complete the setting 40
- Press to select the desired temperature 40
- Press to select the desired time 40
- Copy mode 41
- Press to complete the setting 41
- Press to confirm the day of the week to be copied 41
- Press to select the destination day of the week 41
- Caution 42
- Confirming a reservation 42
- Press to exit confirming mode 42
- Press to select the day of the week and the reservation number to be confirmed 42
- Press while is displayed on the lcd 42
- To deactivate weekly timer operation 42
- All reservations 43
- Deleted 43
- Hold for 5 seconds 43
- Hold for 5 seconds while normal display 43
- Press and select blank 43
- Press to select the day of the week and the 43
- Press to select the day of the week to be 43
- Reservation number to be deleted 43
- The individual reservation 43
- The reservations for each day of the week 43
- To delete reservations 43
- Auto restart function 44
- Hot start function 44
- Indoor unit on off button 44
- Other functions 44
- Signal receiving sign 44
- Titanium apatite photocatalytic air purifying filter 44
- Function of thermistor 45
- Command frequency is determined in the following order of priority 1 limiting defrost control time 2 forced cooling 3 indoor frequency command 46
- Control specification 46
- Detail 46
- Detail how to determine frequency the compressor s frequency is determined by taking the following steps 46
- Determine command frequency 46
- Frequency control 46
- Mode hierarchy 46
- Note unless specified otherwise a dry operation command is regarded as cooling operation 46
- Outline frequency is determined according to the difference between the room thermistor temperature and the target temperature 46
- Outline the air conditioner control has normal operation mode forced operation mode and power transistor test mode for installation and servicing 46
- Determine lower limit frequency 47
- Determine prohibited frequency 47
- Determine upper limit frequency 47
- For limiting lower limit frequency management is carried out only when the frequency rises 47
- Frequency management when other controls are functioning 47
- I control if the operating frequency does not change for more than a certain fixed time the frequency is adjusted 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 47
- Indoor frequency command d signal the difference between the room thermistor temperature and the target temperature is taken as the d signal and is used for frequency command 47
- Pi control determine frequency up down by d signal 1 p control the d value is calculated in each sampling time 15 20 seconds and the frequency is adjusted according to its difference from the frequency previously calculated 47
- Th off thermostat off 47
- 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 47
- The minimum value is set as an upper limit frequency among the frequency upper limits of the following functions compressor protection input current discharge pipe temperature heating peak cut freeze up protection defrost 47
- There is a certain prohibited frequency such as a power supply frequency 47
- Upper and lower limit of frequency by pi control the frequency upper and lower limits are set according to the command of the indoor unit when the indoor or outdoor unit quiet operation command comes from the indoor unit the upper limit frequency is lower than the usual setting 47
- When frequency is dropping frequency management is carried out only when the frequency drops 47
- When starting the compressor the frequency is initialized according to the d value and the q value of the indoor unit q value indoor unit output determined from indoor unit volume airflow rate and other factors 47
- Controls at mode changing start up 48
- Four way valve switching 48
- Preheating control 48
- 3 minute standby 49
- Compressor protection function 49
- Detail starting conditions 1 when the compressor starts and the four way valve switches from off to on 2 when the four way valve switches from on to off during operation 3 when the compressor starts after resetting 4 when the compressor starts after the fault of four way valve switching the lower limit of frequency keeps a hz for b seconds with any conditions 1 through 4 above 49
- Four way valve operation compensation 49
- Outline at the beginning of the operation as the four way valve is switched the pressure difference to activate the four way valve is acquired by having output frequency which is more than a certain fixed frequency for a certain fixed time 49
- Turning on the compressor is prohibited for 3 minutes after turning it off except when defrosting 49
- When turning the compressor from off to on the upper limit of frequency is set as follows the function is not activated when defrosting 49
- Detail 50
- Discharge pipe temperature control 50
- Outline the discharge pipe temperature is used as the internal temperature of the compressor if the discharge pipe temperature rises above a certain level the upper limit of frequency is set to keep the discharge pipe temperature from rising further 50
- After 2 seconds in this zone the compressor is stopped dropping zone 51
- After this the output frequency is lowered by 2 hz every second until it reaches the keep zone keep zone 51
- Detail 51
- Frequency control in each zone stop zone 51
- Input current control 51
- Limit of the frequency is canceled 51
- Limitation of current dropping and stop value according to the outdoor temperature 51
- Outline the microcomputer calculates the input current while the compressor is running and sets the frequency upper limit from the input current in case of heat pump models this control which is the upper limit control of the frequency takes priority over the lower limit of control of four way valve operation compensation 51
- The current drops when outdoor temperature becomes higher than a certain level depending on the model 51
- The present maximum frequency goes on reset zone 51
- The upper limit of the compressor frequency is defined as operation frequency 2 hz 51
- Detail 52
- Detail the operating frequency limitation is judged with the indoor heat exchanger temperature 52
- Freeze up protection control 52
- Heating peak cut control 52
- Outline during cooling operation the signal sent from the indoor unit controls the operating frequency limitation and prevents freezing of the indoor heat exchanger the signal from the indoor unit is divided into zones 52
- Outline during heating operation the indoor heat exchanger temperature determines the frequency upper limit to prevent abnormal high pressure 52
- Liquid compression protection function 53
- Outdoor fan control 53
- Conditions for canceling defrost the judgment is made with the outdoor heat exchanger temperature b c 54
- Defrost control 54
- Detail conditions for starting defrost 54
- More than a minutes of accumulated time pass after the start of the operation or ending the previous defrosting 54
- Outline defrosting is carried out by the cooling cycle reverse cycle the defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting 54
- The compressor operates for 6 minutes 54
- The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature 54
- The system is in heating operation 54
- Detail the followings are the examples of electronic expansion valve control which function in each operation mode 55
- Electronic expansion valve control 55
- Function and control 44 55
- H available not available 55
- Outline the following items are included in the electronic expansion valve control electronic expansion valve is fully closed 1 electronic expansion valve is fully closed when turning on the power 2 pressure equalizing control open control 1 electronic expansion valve control when starting operation 2 electronic expansion valve control when the frequency changes 3 electronic expansion valve control for defrosting 4 electronic expansion valve control when the discharge pipe temperature is abnormally high 5 electronic expansion valve control when the discharge pipe thermistor is disconnected feedback control target discharge pipe temperature control 55
- Sibe041213e control specification 55
- Control when the frequency changes 56
- Fully closing with power on 56
- High discharge pipe temperature control 56
- Opening limit control 56
- Pressure equalizing control 56
- Starting operation control 56
- Control for disconnection of the discharge pipe thermistor 57
- Target discharge pipe temperature control 57
- Detection of overcurrent and overload 58
- Malfunctions 58
- Refrigerant shortage control 58
- Sensor malfunction detection 58
- Part 5 remote controller 59
- Remote controller 9 59
- 1 powerful operation p 3 60
- Button 60
- Display lcd 60
- Fan setting button 60
- Note refer to the operation manual of applicable model for detail you can download operation manual from distributor s page distributor s page product information operation installation manual url http global daikin com daikin global distributors_admin user_mng login php 60
- On off button 60
- Powerfu 60
- Reference refer to the following pages for detail 60
- Remote controller 60
- Remote controller sibe041213e 60
- Signal transmitter 60
- Temperature adjustment buttons 60
- Button 61
- Comfort airflow operatio 61
- Comfort sensor button 61
- Intelligent eye operatio 61
- Lamp brightness setting button 61
- Mode button 61
- Note refer to the operation manual of applicable model for detail you can download operation manual from distributor s page distributor s page product information operation installation manual url http global daikin com daikin global distributors_admin user_mng login php 61
- Off timer button 61
- On timer button 61
- Open the front cover 61
- Quiet button 61
- Reference refer to the following pages for detail 61
- Select button 61
- Timer cancel button 61
- Check 2 62
- Part 6 service diagnosis 62
- Problem symptoms and measures 3 3 service check function 4 4 troubleshooting 7 62
- Troubleshooting with led 2 62
- Indoor unit 63
- Outdoor unit 63
- Troubleshooting with led 63
- Problem symptoms and measures 64
- Check method 1 1 when the timer cancel button is held down for 5 seconds 65
- Is displayed on the temperature display screen 65
- Note 1 a short beep or two consecutive beeps indicate non corresponding codes 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 the check method 2 refer to page 55 65
- Press the timer cancel button repeatedly until a long beep sounds 65
- Service check function 65
- The code indication changes in the sequence shown below 65
- Displayed only when system down occurs 68
- Error codes and description 68
- Troubleshooting 68
- Defective indoor unit pcb 69
- Disconnection of connector 69
- Error code 69
- Error decision conditions the system cannot set the internal settings 69
- Indoor unit pcb abnormality 69
- Method of error detection the system checks if the circuit works properly within the microcomputer of the indoor unit 69
- Model type connector wall mounted type terminal board control pcb h1 h2 h3 69
- Note check the following connector 69
- Reduction of power supply voltage 69
- Service diagnosis 58 69
- Sibe041213e troubleshooting 69
- Supposed causes 69
- Troubleshooting 69
- Wrong models interconnected 69
- Check no 1 refer to p 2 70
- Clogged air filter of the indoor unit 70
- Defective indoor heat exchanger thermistor 70
- Defective indoor unit pcb 70
- Dust accumulation on the indoor heat exchanger 70
- Error code 70
- Error decision conditions 70
- Freeze up protection control during cooling operation the freeze up protection control operation halt is activated according to the temperature detected by the indoor heat exchanger thermistor 70
- Freeze up protection control during cooling operation the indoor heat exchanger temperature is below 0 c 70
- Freeze up protection control heating peak cut control 70
- Heating peak cut control during heating operation the indoor heat exchanger temperature is above 65 c 70
- Heating peak cut control during heating operation the temperature detected by the indoor heat exchanger thermistor is used for the heating peak cut control operation halt outdoor fan stop etc 70
- Method of error detection 70
- Service diagnosis 70
- Short circuited air 70
- Supposed causes 70
- Troubleshooting 70
- Troubleshooting sibe041213e 70
- Fan motor dc motor or related abnormality 71
- Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 72
- Caution 72
- Check no 2 refer to p 3 72
- Service diagnosis 72
- Troubleshooting 72
- Troubleshooting sibe041213e 72
- Thermistor or related abnormality indoor unit 73
- Refrigerant shortage 74
- Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 75
- Caution 75
- Check no 1 refer to p 2 75
- Check no 2 refer to p 3 75
- Service diagnosis 64 75
- Sibe041213e troubleshooting 75
- Troubleshooting 75
- Low voltage detection or over voltage detection 76
- Caution be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 77
- Service diagnosis 66 77
- Sibe041213e troubleshooting 77
- Troubleshooting 77
- Signal transmission error between indoor unit and outdoor unit 78
- Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 79
- Caution 79
- Check no 1 refer to p 3 79
- Service diagnosis 68 79
- Sibe041213e troubleshooting 79
- Troubleshooting 79
- Defective indoor unit pcb 80
- Defective outdoor unit pcb 80
- Error code 80
- Error decision conditions the pair type and multi type are interconnected 80
- Method of error detection the supply power is detected for its requirements pair type is different from multi type by the indoor outdoor transmission signal 80
- Service diagnosis 80
- Supposed causes 80
- Troubleshooting 80
- Troubleshooting sibe041213e 80
- Unspecified voltage between indoor unit and outdoor unit 80
- Wrong indoor unit pcb or outdoor unit pcb mounted 80
- Wrong models interconnected 80
- Wrong wiring of connecting wires 80
- Broken harness between pcbs 81
- Defective outdoor unit pcb 81
- Error code 81
- Error decision conditions 81
- Method of error detection 81
- Momentary fall of voltage 81
- Momentary power failure 81
- Outdoor unit pcb abnormality 81
- Service diagnosis 70 81
- Sibe041213e troubleshooting 81
- Supposed causes 81
- The microprocessor program runs out of control 81
- The system checks if the microprocessor is working in order 81
- The system checks if the zero cross signal comes in properly 81
- The zero cross signal is not detected 81
- Troubleshooting 35 50 class 81
- Caution be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred 82
- Check the voltage between no and no on the outdoor terminal board 82
- Service diagnosis 82
- Troubleshooting 42 class 82
- Troubleshooting sibe041213e 82
- Ol activation compressor overload 83
- Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 84
- Caution 84
- Check no 1 refer to p 2 84
- Check no 2 refer to p 3 84
- Check no 3 refer to p 4 84
- Check no 4 refer to p 4 84
- Note ol q1l activating temperature 120 c ol q1l recovery temperature 95 c 84
- Service diagnosis 84
- Troubleshooting 84
- Troubleshooting sibe041213e 84
- A compressor lock is detected by the current waveform generated when applying high frequency voltage to the motor 85
- Check no 5 refer to p 5 85
- Compressor harness disconnected 85
- Compressor lock 85
- Compressor locked 85
- Error code 85
- Error decision conditions 35 42 class 85
- If the error repeats the system is shut down 85
- Method of error detection a compressor lock is detected by checking the compressor running condition through the position detection circuit 85
- Operation stops due to overcurrent 85
- Reset condition continuous run for about 11 minutes without any other error 85
- Reset condition continuous run for about 5 minutes without any other error 85
- Service diagnosis 74 85
- Sibe041213e troubleshooting 85
- Supposed causes 85
- Troubleshooting 85
- Check no 6 refer to p 7 86
- Dc fan lock 86
- Defective fan motor 86
- Defective outdoor unit pcb 86
- Disconnection of the fan motor 86
- Error code 86
- Error decision conditions 86
- Foreign matter stuck in the fan 86
- If the error repeats the system is shut down 86
- Method of error detection an error is determined with the high voltage fan motor rotation speed detected by the hall ic 86
- Reset condition continuous run for about 11 minutes 35 42 class or 5 minutes 50 class without any other error 86
- Service diagnosis 86
- Supposed causes 86
- The fan does not start in about 15 60 seconds even when the fan motor is running 86
- Troubleshooting 86
- Troubleshooting sibe041213e 86
- Check no 5 refer to p 5 87
- Check no 7 refer to p 8 87
- Check no 8 refer to p 8 87
- Defective compressor 87
- Defective outdoor unit pcb 87
- Defective power module 87
- Error code 87
- Error decision conditions the current exceeds about 9 5 20 a depending on the model for 2 seconds with the compressor running the upper limit of the current decreases when the outdoor temperature exceeds a certain level 87
- Input overcurrent detection 87
- Method of error detection an input overcurrent is detected by checking the input current value with the compressor running 87
- Outdoor temperature is out of operation range 87
- Power supply voltage is not as specified 87
- Service diagnosis 76 87
- Short circuit 87
- Sibe041213e troubleshooting 87
- Supposed causes 87
- Troubleshooting 87
- Four way valve abnormality 88
- Caution be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 89
- Check no 1 refer to p 2 89
- Check no 3 refer to p 4 89
- Check no 4 refer to p 4 89
- Service diagnosis 78 89
- Sibe041213e troubleshooting 89
- Troubleshooting 89
- 1 above 35hz rising above 30hz dropping 110 95 2 below 35hz rising below 30hz dropping 108 93 90
- 1 above 45 hz rising above 40 hz dropping 110 97 2 30 45 hz rising 25 40 hz dropping 105 92 3 below 30 hz rising below 25 hz dropping 99 86 90
- A c b c 90
- A c b c 110 95 90
- Check no 1 refer to p 2 90
- Check no 2 refer to p 3 90
- Check no 4 refer to p 4 90
- Defective discharge pipe thermistor defective outdoor heat exchanger thermistor or outdoor temperature thermistor 90
- Defective electronic expansion valve or coil 90
- Defective four way valve 90
- Defective outdoor unit pcb 90
- Defective stop valve 90
- Discharge pipe temperature control 90
- Error code 90
- Error decision conditions 90
- Frequency 90
- If the error repeats the system is shut down 90
- If the temperature detected by the discharge pipe thermistor rises above a c the compressor stops 90
- Method of error detection an error is determined with the temperature detected by the discharge pipe thermistor 90
- Refrigerant shortage 90
- Reset condition continuous run for about 60 minutes without any other error 90
- Service diagnosis 90
- Supposed causes 90
- The error is cleared when the discharge pipe temperature has dropped below b c 90
- Troubleshooting 90
- Troubleshooting sibe041213e 90
- Water mixed in refrigerant 90
- Check no 1 refer to p 2 91
- Check no 2 refer to p 3 91
- Check no 7 refer to p 8 91
- Check no 8 refer to p 8 91
- Check no 9 refer to p 9 91
- Defective electronic expansion valve or coil 91
- Defective outdoor fan motor 91
- Defective outdoor heat exchanger thermistor 91
- Defective outdoor unit pcb 91
- Defective stop valve 91
- Dirty outdoor heat exchanger 91
- Error code 91
- Error decision conditions 91
- High pressure control in cooling 91
- Method of error detection high pressure control operation halt frequency drop etc is activated in cooling operation if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit 91
- Service diagnosis 80 91
- Sibe041213e troubleshooting 91
- Supposed causes 91
- The error is cleared when the temperature drops below about 50 55 c 91
- The installation space is not large enough 91
- The temperature sensed by the outdoor heat exchanger thermistor rises above about 60 65 c 91
- Troubleshooting 91
- Broken or disconnected harness 92
- Compressor system sensor abnormality 92
- Defective outdoor unit pcb 92
- Error code 92
- Error decision conditions 92
- Method of error detection 92
- Service diagnosis 92
- Supposed causes 92
- The dc current before compressor start up is out of the range 0 4 v sensor output converted to voltage value 92
- The dc voltage before compressor start up is below 50 v 92
- The system checks the dc current before the compressor starts 92
- Troubleshooting 92
- Troubleshooting sibe041213e 92
- Position sensor abnormality 93
- Caution be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 94
- Check no 0 refer to p 9 94
- Check no 5 refer to p 5 94
- Check no 8 refer to p 8 94
- Service diagnosis 94
- Troubleshooting 94
- Troubleshooting sibe041213e 94
- Dc voltage current sensor abnormality 35 42 class only 95
- H9 j3 j6 p4 96
- Thermistor or related abnormality outdoor unit 96
- Caution 97
- Check no 1 refer to p 2 97
- Discharge pipe thermistor 97
- Outdoor heat exchanger thermistor 97
- Outdoor temperature thermistor 97
- Service diagnosis 86 97
- Sibe041213e troubleshooting 97
- Troubleshooting in case of 97
- A c b c c c 35 class 98 75 83 42 class 80 70 75 50 class 122 64 113 98
- Check no 7 refer to p 8 98
- Check no 9 refer to p 9 98
- Defective outdoor fan motor 98
- Defective outdoor unit pcb 98
- Defective radiation fin thermistor 98
- Disconnection of connector 98
- Electrical box temperature rise 98
- Error code 98
- Error decision conditions 98
- Method of error detection an electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off 98
- Service diagnosis 98
- Short circuit 98
- Supposed causes 98
- The error is cleared when the radiation fin temperature drops below b c 98
- To cool the electrical components the outdoor fan starts when the radiation fin temperature rises above c c and stops when it drops below b c 98
- Troubleshooting 98
- Troubleshooting sibe041213e 98
- With the compressor off the radiation fin temperature is above a c 98
- Radiation fin temperature rise 99
- A c 35 class 98 42 class 92 50 class 85 100
- Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 100
- Caution 100
- Check no 7 refer to p 8 100
- Check no 9 refer to p 9 100
- Note refer to silicon grease on power transistor diode bridge on page 111 for detail 100
- Service diagnosis 100
- Troubleshooting 100
- Troubleshooting sibe041213e 100
- Output overcurrent detection 101
- Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged 102
- Caution 102
- Check no 2 refer to p 01 102
- Check no 5 refer to p 5 102
- Check no 7 refer to p 8 102
- Check no 8 refer to p 8 102
- Service diagnosis 102
- Troubleshooting 102
- Troubleshooting sibe041213e 102
- Check no 1 disconnect the connectors of the thermistors from the pcb and measure the resistance of each thermistor using tester 103
- Thermistor resistance check 103
- When the connector of indoor heat exchanger thermistor is soldered on the pcb remove the thermistor and measure the resistance 103
- When the room temperature thermistor is directly mounted on a pcb remove the pcb from the control pcb to measure the resistance 103
- Check if the power supply waveform is a sine wave fig 104
- Check if there is waveform disturbance near the zero cross sections circled in fig 104
- Check no 1 measure the power supply waveform between no 1 and no 2 on the terminal board and check the waveform disturbance 104
- Check no 2 1 check the connection of connector 2 check the motor power supply voltage output pins 4 7 3 check the motor control voltage pins 4 3 4 check the rotation command voltage pins 4 2 5 check the rotation pulse pins 4 1 104
- Check no 2 conduct the followings to check the electronic expansion valve ev 1 check to see if the ev connector is correctly connected to the pcb 2 turn the power off and on again and check to see 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 tester 4 check the continuity between the pins 1 6 2 6 3 6 4 6 if there is no continuity between the pins the ev coil is faulty 5 if the continuity is confirmed in step 3 the outdoor unit pcb is faulty 104
- Check sibe041213e 104
- Electronic expansion valve check 104
- Fan motor connector output check 104
- Fig fig 104
- Note please note that the latching sound varies depending on the valve type 104
- Power supply waveforms check 104
- Service diagnosis 104
- Check no 3 105
- Check no 4 105
- Four way valve performance check 105
- Inverter units refrigerant system check 105
- Service diagnosis 94 105
- Sibe041213e check 105
- Inverter analyzer check 106
- 50 class make sure that the voltage of 320 30 v is applied 1 set operation off and power off disconnect the connector s70 2 check that the voltage between the pins 4 7 is 320 vdc 3 check that the control voltage between the pins 3 4 is 15 vdc 4 check that the rotation command voltage between the pins 2 4 is 0 15 vdc 5 keep operation off and power off connect the connector s70 6 check whether 2 pulses 0 15 vdc are output at the pins 1 4 when the fan motor is rotated 1 turn by hand 108
- Check no 6 35 class 1 check that the voltage between the pins 10 11 is 15 vdc 2 check if the hall ic generates the rotation pulse 0 15 vdc 4 times between the pins 10 12 10 13 when the fan motor is manually rotated once 108
- Check sibe041213e 108
- Rotation pulse check on the outdoor unit pcb 108
- Service diagnosis 108
- 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 if ng in step 4 defective hall ic replace the outdoor fan motor if ok in both steps 2 and 4 replace the outdoor unit pcb 108
- Check no 7 109
- Check no 8 109
- Discharge pressure check 109
- Installation condition check 109
- Service diagnosis 98 109
- Sibe041213e check 109
- Main circuit short check 110
- Outdoor fan system check 110
- Check no 2 112
- Disconnect the compressor harness connector from the outdoor unit pcb to disengage the connector press the protrusion on the connector 112
- Follow the procedure below to measure resistance between the terminals of the power module and the terminals of the compressor with a multi tester evaluate the measurement results referring to the following table 112
- Note check to make sure that the voltage between and of the power module is approx 0 v before checking 112
- Power module check 112
- Part 7 tips for servicing 114
- Silicon grease on power transistor diode bridge 11 114
- Tips for servicing 04 114
- Trial operation 06 3 field settings 07 114
- Detail 1 remove the valve caps from the liquid stop valve and the gas stop valve 2 carry out forced cooling operation 3 after 5 to 10 minutes close the liquid stop valve with a hexagonal wrench 4 after 2 to 3 minutes close the gas stop valve and stop the forced cooling operation 115
- Forced cooling operation 115
- Outline in order to protect the environment be sure to conduct pump down operation when relocating or disposing the unit 115
- Pump down operation 115
- Refer to forced cooling operation below 115
- Tips for servicing 115
- Trial operation 117
- Field settings 118
- Model type setting 118
- When 2 units are installed in 1 room 118
- Facility setting jumper cooling at low outdoor temperature 119
- Standby electricity saving 119
- Caution replace the pcb if you accidentally cut a wrong jumper jumpers are necessary for electronic circuit improper operation may occur if you cut any of them 121
- For the location of the jumper refer to page 121
- For the location of the jumper refer to page 7 121
- Indoor unit 121
- Jumper settings 121
- Outdoor unit 121
- Silicon grease on power transistor diode bridge 122
- Part 8 appendix 123
- Piping diagrams 13 123
- Removal procedure booklet no 17 123
- Wiring diagrams 15 123
- Ftxs35 42k2v1b ftxs50k2v1b 124
- Indoor unit 124
- Outdoor unit 124
- Piping diagrams 124
- Rxs35k2v1b 124
- Appendix 114 125
- Rxs42k2v1b 125
- Rxs50k2v1b 125
- Sibe041213e piping diagrams 125
- Appendix 126
- Ftxs35 42 50k2v1b 126
- Indoor unit 126
- Outdoor unit 126
- Rxs35k2v1b 126
- Wiring diagrams 126
- Wiring diagrams sibe041213e 126
- Appendix 116 127
- D079016 127
- Indoor 127
- Outdoor 127
- Rxs42k2v1b 127
- Rxs50k2v1b 127
- Sibe041213e wiring diagrams 127
- Refer to the following booklets for removal procedure 128
- Removal procedure booklet no 128
- Revision history 129
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