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Daikin FTXS35K2V1B Service Manual
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Daikin FTXS35K2V1B Service Manual

Inverter pair wall mounted type k-series
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See also: Operating Manual , Installation Manual
Service
Manual
Inverter Pair
Wall Mounted Type K-Series
SiBE041213E
[Applied Models]
Inverter Pair : Heat Pump

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Summary of Contents for Daikin FTXS35K2V1B

  • Page 1 SiBE041213E Service Manual Inverter Pair Wall Mounted Type K-Series [Applied Models] Inverter Pair : Heat Pump...
  • Page 2 SiBE041213E Inverter Pair Wall Mounted Type K-Series Heat Pump Indoor Unit FTXS35K2V1B FTXS42K2V1B FTXS50K2V1B Outdoor Unit RXS35K2V1B RXS42K2V1B RXS50K2V1B The removal procedure for each model is separately bound. Refer to page 117 for the booklet number of applicable model. Table of Contents...

  • Page 3: Table Of Contents

    SiBE041213E 1. Introduction .....................v 1.1 Safety Cautions ..................v 1.2 Used Icons ....................x Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............3 1. Specifications ..................4 Part 3 Printed Circuit Board Connector Wiring Diagram ..... 6 1. Indoor Unit....................7 2.
  • Page 4 SiBE041213E Part 5 Remote Controller ............48 1. Remote Controller .................49 Part 6 Service Diagnosis............. 51 1. Troubleshooting with LED ..............52 1.1 Indoor Unit....................52 1.2 Outdoor Unit ...................52 2. Problem Symptoms and Measures ............53 3. Service Check Function ................54 4. Troubleshooting ..................57 4.1 Error Codes and Description ..............57 4.2 Indoor Unit PCB Abnormality ..............58 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......59...
  • Page 5 SiBE041213E Part 7 Tips for Servicing ............103 1. Tips for Servicing ................104 1.1 Pump Down Operation .................104 1.2 Forced Cooling Operation ..............104 2. Trial Operation ..................106 3. Field Settings ..................107 3.1 When 2 Units are Installed in 1 Room..........107 3.2 Model Type Setting ................107 3.3 Standby Electricity Saving..............108 3.4 Facility Setting Jumper (cooling at low outdoor temperature) ....108...

  • Page 6: Introduction

    Introduction SiBE041213E 1. Introduction Safety Cautions Cautions and Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “ Warning” and “ Caution”. The “ Warning” Warnings items are especially important since they can lead to death or serious injury if they are not followed closely.
  • Page 7 SiBE041213E Introduction Warning Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug. Plugging or unplugging the power cable plug to operate the equipment may cause an electrical shock or fire. Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place (more than 2 m).
  • Page 8 Introduction SiBE041213E Caution Use the welder in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency. 1.1.2 Cautions Regarding Safety of Users Warning Do not store the equipment in a room with successive fire sources (e.g., naked flame, gas appliance, electric heater).
  • Page 9 SiBE041213E Introduction Warning Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R- 22) in the refrigerant system. If air enters the refrigerating system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
  • Page 10 Introduction SiBE041213E Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections may cause excessive heat generation, fire or an electrical shock. If the installation platform or frame has corroded, replace it.

  • Page 11: Used Icons

    SiBE041213E Introduction Used Icons Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in the table below: Icon Type of Description Information Note A “note” provides information that is not indispensable, but may nevertheless be valuable to the reader, such as tips and tricks.

  • Page 12: Part 1 List Of Functions

    SiBE041213E Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 13: Functions

    SiBE041213E Functions 1. Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — Function Clean –10 Photocatalytic deodorizing filter — Operation limit for cooling (°CDB) Air-purifying filter with photocatalytic — deodorizing function –15 Titanium apatite photocatalytic air- Operation limit for heating (°CWB) purifying filter PAM control...

  • Page 14: Part 2 Specifications

    SiBE041213E Part 2 Specifications 1. Specifications ..................4 Specifications...

  • Page 15: Specifications

    SiBE041213E Specifications 1. Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXS35K2V1B FTXS42K2V1B Model RXS35K2V1B RXS42K2V1B Outdoor Unit Cooling Heating Cooling Heating 3.50 (1.4 ~ 4.0) 4.00 (1.4 ~ 5.2) 4.20 (1.7 ~ 5.0) 5.40 (1.7 ~ 6.0) Capacity Rated (Min.
  • Page 16 Specifications SiBE041213E 50 Hz, 220 - 230 - 240 V Indoor Unit FTXS50K2V1B Model RXS50K2V1B Outdoor Unit Cooling Heating 5.00 (1.7 ~ 5.3) 5.80 (1.7 ~ 6.5) Capacity Rated (Min. ~ Max.) Btu/h 17,100 (5,800 ~ 18,100) 19,800 (5,800 ~ 22,200) kcal/h 4,300 (1,460 ~ 4,560) 4,990 (1,460 ~ 5,590)

  • Page 17: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiBE041213E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................7 2. Outdoor Unit....................9 2.1 RXS35K2V1B...................9 2.2 RXS42K2V1B..................11 2.3 RXS50K2V1B..................12 Printed Circuit Board Connector Wiring Diagram...

  • Page 18: Indoor Unit

    Indoor Unit SiBE041213E 1. Indoor Unit Control PCB 1) S1 Connector for DC fan motor 2) S21 Connector for centralized control (HA) 3) S25 Connector for INTELLIGENT EYE sensor PCB 4) S32 Indoor heat exchanger thermistor 5) S41 Connector for swing motors 6) S46 Connector for display PCB 7) S47...
  • Page 19 SiBE041213E Indoor Unit Signal Receiver 1) S48 Connector for control PCB 3P210728-1 Display PCB 1) S49 Connector for control PCB 2) SW1 Forced cooling operation [ON/OFF] button ∗ Refer to page 104 for detail. 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P)

  • Page 20: Outdoor Unit

    Outdoor Unit SiBE041213E 2. Outdoor Unit RXS35K2V1B Main PCB 1) S10 Connector for filter PCB 2) S20 Connector for electronic expansion valve coil 3) S40 Connector for overload protector 4) S50 Connector for magnetic relay 5) S70 Connector for fan motor 6) S80 Connector for four way valve coil 7) S90...
  • Page 21 SiBE041213E Outdoor Unit Filter PCB 1) S11 Connector for main PCB 2) AC1, AC2, S Connector for terminal board 3) E1, E2 Terminal for earth wire 4) HL2, HN2 Connector for main PCB 5) HR1 Connector for reactor 6) FU1 Fuse (3.15 A, 250 V) 7) FU3 Fuse (20 A, 250 V)

  • Page 22: Rxs42K2V1B

    Outdoor Unit SiBE041213E RXS42K2V1B Main PCB 1) S20 Connector for electronic expansion valve coil 2) S40 Connector for overload protector 3) S70 Connector for fan motor 4) S80 Connector for four way valve coil 5) S90 Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) 6) U, V, W Connector for compressor 7) HL1, HN1, S...

  • Page 23: Rxs50K2V1B

    SiBE041213E Outdoor Unit RXS50K2V1B Main PCB 1) S10 Connector for [S11] on filter PCB 2) S12 Connector for [HL4] [HN4] on filter PCB 3) S20 Connector for electronic expansion valve coil 4) S40 Connector for overload protector 5) S50 Connector for magnetic relay 6) S70 Connector for fan motor 7) S80...
  • Page 24 Outdoor Unit SiBE041213E Filter PCB 1) S11 Connector for [S10] on main PCB 2) HL1, HN1, S Connector for terminal board 3) E1, E2 Terminal for earth wire 4) HL2, HN2 Connector for [HL3] [HN3] on main PCB 5) HL4, HN4 Connector for [S12] on main PCB 6) FU1 Fuse (3.15 A, 250 V)

  • Page 25: Part 4 Function And Control

    SiBE041213E Part 4 Function and Control 1. Main Functions..................15 1.1 Temperature Control ................15 1.2 Frequency Principle................15 1.3 Airflow Direction Control.................17 1.4 Fan Speed Control for Indoor Unit ............18 1.5 Program Dry Operation ................19 1.6 Automatic Operation................20 1.7 Thermostat Control.................21 1.8 NIGHT SET Mode ..................22 1.9 Inverter POWERFUL Operation .............23 1.10 ECONO Operation .................23 1.11 2-Area INTELLIGENT EYE Operation ...........24...

  • Page 26: Main Functions

    Main Functions SiBE041213E 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer Target temperature Room thermistor temperature...
  • Page 27 SiBE041213E Main Functions Drawing of The following drawing shows a schematic view of the inverter principle: Inverter Refrigerant circulation rate (high) high speed Amount of heat Amount of heat exchanged air (large) exchanged air (large) high f low f Amount of heat Amount of heat exchanged air (small) exchanged air (small)

  • Page 28: Airflow Direction Control

    Main Functions SiBE041213E Airflow Direction Control Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum control in cooling, dry, and heating operation. Dual Flaps <Cooling / Dry> During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room.

  • Page 29: Fan Speed Control For Indoor Unit

    SiBE041213E Main Functions Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.

  • Page 30: Program Dry Operation

    Main Functions SiBE041213E Program Dry Operation 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. 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.

  • Page 31: Automatic Operation

    SiBE041213E Main Functions Automatic Operation Outline Automatic Cooling / Heating Function When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.

  • Page 32: Thermostat Control

    Main Functions SiBE041213E Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Detail Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON Condition The temperature difference returns to the zone C after being in the zone A. The system resumes from defrost control in any zones except A.

  • Page 33: Night Set Mode

    SiBE041213E Main Functions NIGHT SET Mode Outline When the OFF TIMER is set, the NIGHT SET Mode is automatically activated. The NIGHT SET Mode keeps the airflow rate setting. 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.

  • Page 34: Inverter Powerful Operation

    Main Functions SiBE041213E Inverter POWERFUL Operation 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. Detail When the [POWERFUL] button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.

  • Page 35: 2-Area Intelligent Eye Operation

    SiBE041213E Main Functions 1.11 2-Area INTELLIGENT EYE Operation 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.
  • Page 36 Main Functions SiBE041213E 2. Motions (for example: in cooling) within 20 minutes 20 min. 20 min. Human detection signal RESET. (From area A or B) Target temperature INTELLIGENT EYE lamp Remote controller [INTELLIGENT EYE] button Operation Set speed Set speed Fan speed ( ) (R15308) When the microcomputer does not have a signal from the sensor in 20 minutes, it judges...

  • Page 37: Clock Setting

    SiBE041213E Main Functions 1.12 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press the [CLOCK] button. → is displayed and MON and blink. 2. Press the [SELECT] button to set the clock to the current day of the week. 3.

  • Page 38: Weekly Timer Operation

    Main Functions SiBE041213E 1.13 WEEKLY TIMER Operation 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. Detail Using in these cases of WEEKLY TIMER Example: The same timer settings are made for the week from Monday through Friday while different timer settings are made for the weekend.
  • Page 39 SiBE041213E Main Functions To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. Program 1 Program 2 Program 3 Program 4 [Monday] 25˚C 27˚C...
  • Page 40 Main Functions SiBE041213E Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10 minute intervals. • To return to the ON/OFF TIMER mode setting, press • Go to step when setting the OFF TIMER. Press •...
  • Page 41 SiBE041213E Main Functions Copy mode • A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied. Program 1 Program 2 Program 3 Program 4 [Monday] 25˚C 27˚C...
  • Page 42 Main Functions SiBE041213E Confirming a reservation • The reservation can be confirmed. Setting Displays Normal Confirmation Press • The day of the week and the reservation number of the current day will be displayed. Press to select the day of the week and the reservation number to be confirmed.
  • Page 43 SiBE041213E Main Functions To delete reservations The individual reservation Press • The day of the week and the reservation number will be displayed. Press to select the day of the week and the reservation number to be deleted. Press • “ ”...

  • Page 44: Other Functions

    Main Functions SiBE041213E 1.14 Other Functions 1.14.1 Hot-Start Function In order to prevent the cold air blast that normally comes when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or made very weak thereby carrying out comfortable heating of the room.

  • Page 45: Function Of Thermistor

    SiBE041213E Function of Thermistor 2. Function of Thermistor Electronic expansion valve Four way valve Compressor (R14247) (1) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe temperature. The system sets the target discharge pipe temperature according to the Exchanger outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve Thermistor...

  • Page 46: Control Specification

    Control Specification SiBE041213E 3. Control Specification Mode Hierarchy Outline The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing. Detail Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Power transistor test mode Normal operation mode Cooling (includes drying)
  • Page 47 SiBE041213E Control Specification 2. Determine upper limit frequency 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. 3.

  • Page 48: Controls At Mode Changing / Start-Up

    Control Specification SiBE041213E Controls at Mode Changing / Start-up 3.3.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the preheating command from the indoor unit, the outdoor temperature, and the discharge pipe temperature. This control does not work on RXS42K2V1B. Outdoor temperature ≥...

  • Page 49: Compressor Protection Function

    SiBE041213E Control Specification 3.3.3 Four Way Valve Operation Compensation 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.

  • Page 50: Discharge Pipe Temperature Control

    Control Specification SiBE041213E Discharge Pipe Temperature Control 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. Detail Stop zone A˚C...

  • Page 51: Input Current Control

    SiBE041213E Control Specification Input Current Control 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.

  • Page 52: Freeze-Up Protection Control

    Control Specification SiBE041213E Freeze-up Protection Control 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.) Detail The operating frequency limitation is judged with the indoor heat exchanger temperature.

  • Page 53: Outdoor Fan Control

    SiBE041213E Control Specification Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control during defrosting The outdoor fan is turned OFF during defrosting.

  • Page 54: Defrost Control

    Control Specification SiBE041213E 3.10 Defrost Control 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. Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.

  • Page 55: Electronic Expansion Valve Control

    SiBE041213E Control Specification 3.11 Electronic Expansion Valve Control 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.

  • Page 56: Pressure Equalizing Control

    Control Specification SiBE041213E 3.11.1 Fully Closing with Power ON The electronic expansion valve is initialized when turning on the power. The opening position is set and the pressure equalization is developed. 3.11.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens, and develops the pressure equalization.
  • Page 57 SiBE041213E Control Specification 3.11.7 Control for Disconnection of the Discharge Pipe Thermistor Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensation temperature. If the discharge pipe thermistor is disconnected, the electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.

  • Page 58: Malfunctions

    Control Specification SiBE041213E 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction may occur in the thermistor. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Outdoor temperature thermistor 3.12.2 Detection of Overcurrent and Overload Outline An excessive output current is detected and the OL temperature is observed to protect the compressor.

  • Page 59: Part 5 Remote Controller

    SiBE041213E Part 5 Remote Controller 1. Remote Controller .................49 Remote Controller...

  • Page 60: Remote Controller

    Refer to the following pages for detail. 1 POWERFUL operation P.23 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) Remote Controller...

  • Page 61: Mode Button

    4 ECONO operation P.23 7 Clock setting P.26 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) Remote Controller...

  • Page 62: Part 6 Service Diagnosis

    SiBE041213E Part 6 Service Diagnosis 1. Troubleshooting with LED ..............52 1.1 Indoor Unit....................52 1.2 Outdoor Unit ...................52 2. Problem Symptoms and Measures ............53 3. Service Check Function ................54 4. Troubleshooting ..................57 4.1 Error Codes and Description ..............57 4.2 Indoor Unit PCB Abnormality ..............58 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......59 4.4 Fan Motor (DC Motor) or Related Abnormality........60 4.5 Thermistor or Related Abnormality (Indoor Unit)........62...

  • Page 63: Troubleshooting With Led

    SiBE041213E Troubleshooting with LED 1. Troubleshooting with LED Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.

  • Page 64: Problem Symptoms And Measures

    Problem Symptoms and Measures SiBE041213E 2. Problem Symptoms and Measures Symptom Check Item Details of Measure Reference Page The unit does not operate. Check the power supply. Check if the rated voltage is supplied. — Check the type of the indoor unit. Check if the indoor unit type is compatible with —...

  • Page 65: Service Check Function

    SiBE041213E Service Check Function 3. Service Check Function Check Method 1 1. When the timer cancel button is held down for 5 seconds, is displayed on the temperature display screen. Timer cancel button (R14553) < ARC466 Series > 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
  • Page 66 Service Check Function SiBE041213E Check Method 2 1. Press the center of the [Temp] button and the [Mode] button at the same time. (R11669) is displayed on the LCD. (R11821) 2. Select (service check) with the [Temp] button. 3. Press the [Mode] button to enter the service check mode. (R11672) The left-side number blinks.
  • Page 67 SiBE041213E Service Check Function 5. Diagnose by the sound. beep : The left-side number does not correspond with the error code. two consecutive beeps : The left-side number corresponds with the error code but the right-side number does not. long beep : Both the left-side and right-side numbers correspond with the error code. (The numbers indicated when you hear the long beep are the error code.

  • Page 68: Troubleshooting

    Troubleshooting SiBE041213E 4. Troubleshooting Error Codes and Description Reference Error Codes Description Page System Normal — Refrigerant shortage Low-voltage detection or over-voltage detection Signal transmission error (between indoor unit and outdoor unit) Unspecified voltage (between indoor unit and outdoor unit) Indoor Indoor unit PCB abnormality Unit...

  • Page 69: Indoor Unit Pcb Abnormality

    SiBE041213E Troubleshooting Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings. Conditions Supposed Wrong models interconnected Disconnection of connector Causes Reduction of power supply voltage...

  • Page 70: Freeze-Up Protection Control / Heating Peak-Cut Control

    Troubleshooting SiBE041213E Freeze-up Protection Control / Heating Peak-cut Control Error Code Method of Error Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated Detection according to the temperature detected by the indoor heat exchanger thermistor. 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.)

  • Page 71: Fan Motor (Dc Motor) Or Related Abnormality

    SiBE041213E Troubleshooting Fan Motor (DC Motor) or Related Abnormality Error Code Method of Error The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Detection Error Decision 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.
  • Page 72 Troubleshooting SiBE041213E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.02 Check the power supply Refer to P.93 voltage. Is the voltage fluctuation Correct the power within ±10% from the supply.

  • Page 73: Thermistor Or Related Abnormality (Indoor Unit)

    SiBE041213E Troubleshooting Thermistor or Related Abnormality (Indoor Unit) C4, C9 Error Code Method of Error The temperatures detected by the thermistors determine thermistor errors. Detection Error Decision The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Conditions Supposed Disconnection of connector...

  • Page 74: Refrigerant Shortage

    Troubleshooting SiBE041213E Refrigerant Shortage Error Code Method of Error Refrigerant shortage detection I: Refrigerant shortage is detected by checking the input current value and the compressor Detection running frequency. If the refrigerant is short, the input current is lower than the normal value. Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of the electronic expansion valve.
  • Page 75 SiBE041213E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.92 Any thermistor Replace the thermistor(s) disconnected? position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗...

  • Page 76: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting SiBE041213E Low-voltage Detection or Over-voltage Detection Error Code Method of Error Indoor Unit Detection Evaluation of zero-cross detection of power supply by the indoor unit PCB. Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit.
  • Page 77 SiBE041213E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Is the power supply voltage fluctuation within Correct the power supply. ±10% from the rated value? Check the connection of the compressor harness.

  • Page 78: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041213E Signal Transmission Error (between Indoor Unit and Outdoor Unit) Error Code Method of Error The data received from the outdoor unit in signal transmission is checked whether it is normal. Detection Error Decision The data sent from the outdoor unit cannot be received normally, or the content of the data is Conditions abnormal.
  • Page 79 SiBE041213E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Refer to P.93 Check the power supply voltage. Is the power supply voltage fluctuation within Correct the power supply. ±10% from the rated value? Check the indoor unit - outdoor...

  • Page 80: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041213E Unspecified Voltage (between Indoor Unit and Outdoor Unit) Error Code Method of Error The supply power is detected for its requirements (pair type is different from multi type) by the indoor / outdoor transmission signal. Detection Error Decision The pair type and multi type are interconnected.

  • Page 81: Outdoor Unit Pcb Abnormality

    SiBE041213E Troubleshooting 4.10 Outdoor Unit PCB Abnormality Error Code Method of Error The system checks if the microprocessor is working in order. The system checks if the zero-cross signal comes in properly. Detection Error Decision The microprocessor program runs out of control. The zero-cross signal is not detected.
  • Page 82 Troubleshooting SiBE041213E Troubleshooting 42 class Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn on the power again. Check the voltage between No.1 and No.2 on the outdoor terminal board.

  • Page 83: Ol Activation (Compressor Overload)

    SiBE041213E Troubleshooting 4.11 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through compressor OL. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Conditions Supposed Disconnection of discharge pipe thermistor...
  • Page 84 Troubleshooting SiBE041213E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.92 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.93 Check No.

  • Page 85: Compressor Lock

    SiBE041213E Troubleshooting 4.12 Compressor Lock Error Code Method of Error A compressor lock is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision 35/42 class Operation stops due to overcurrent. Conditions If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error 50 class A compressor lock is detected by the current waveform generated when applying high-...

  • Page 86: Dc Fan Lock

    Troubleshooting SiBE041213E 4.13 DC Fan Lock Error Code Method of Error An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Detection Error Decision The fan does not start in about 15 ~ 60 seconds even when the fan motor is running. If the error repeats, the system is shut down.

  • Page 87: Input Overcurrent Detection

    SiBE041213E Troubleshooting 4.14 Input Overcurrent Detection Error Code Method of Error An input overcurrent is detected by checking the input current value with the compressor running. Detection Error Decision The current exceeds about 9.25 ~ 20 A (depending on the model) for 2.5 seconds with the compressor running.

  • Page 88: Four Way Valve Abnormality

    Troubleshooting SiBE041213E 4.15 Four Way Valve Abnormality Error Code Method of Error The room temperature thermistor and the indoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Detection Error Decision A following condition continues over 1 ~ 10 minutes (depending on the model) after operating for 5 ~ 10 minutes (depending on the model).
  • Page 89 SiBE041213E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Four way valve coil Refer to P.92 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.94 Harness out of connector? Reconnect the harness.

  • Page 90: Discharge Pipe Temperature Control

    Troubleshooting SiBE041213E 4.16 Discharge Pipe Temperature Control Error Code Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision If the temperature detected by the discharge pipe thermistor rises above A°C, the compressor stops.

  • Page 91: High Pressure Control In Cooling

    SiBE041213E Troubleshooting 4.17 High Pressure Control in Cooling Error Code Method of Error 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. Detection Error Decision The temperature sensed by the outdoor heat exchanger thermistor rises above about 60 ~ 65°C.

  • Page 92: Compressor System Sensor Abnormality

    Troubleshooting SiBE041213E 4.18 Compressor System Sensor Abnormality Error Code Method of Error The system checks the DC current before the compressor starts. Detection Error Decision The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output Conditions converted to voltage value) The DC voltage before compressor start-up is below 50 V.

  • Page 93: Position Sensor Abnormality

    SiBE041213E Troubleshooting 4.19 Position Sensor Abnormality Error Code Method of Error A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes (35/42 class) or 5 minutes (50 class) Conditions without any other error...
  • Page 94 Troubleshooting SiBE041213E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Refer to P.95 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.98 Is the power supply Check No.20...

  • Page 95: Dc Voltage / Current Sensor Abnormality (35/42 Class Only)

    SiBE041213E Troubleshooting 4.20 DC Voltage / Current Sensor Abnormality (35/42 Class Only) Error Code Method of Error DC voltage or DC current sensor abnormality is identified based on the compressor running frequency and the input current. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Conditions Supposed...

  • Page 96: Thermistor Or Related Abnormality (Outdoor Unit)

    Troubleshooting SiBE041213E 4.21 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Error Code Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. A thermistor fault is identified based on the temperature sensed by each thermistor. Detection Error Decision The thermistor input voltage is above 4.96 V or below 0.04 V with the power on.
  • Page 97 SiBE041213E Troubleshooting Troubleshooting In case of “ ” “ ” “ ” Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.92 Turn on the power again. Error displayed Reconnect the connectors again on remote...

  • Page 98: Electrical Box Temperature Rise

    Troubleshooting SiBE041213E 4.22 Electrical Box Temperature Rise Error Code Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Detection Error Decision With the compressor off, the radiation fin temperature is above A°C. The error is cleared when the radiation fin temperature drops below B°C.

  • Page 99: Radiation Fin Temperature Rise

    SiBE041213E Troubleshooting 4.23 Radiation Fin Temperature Rise Error Code Method of Error A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on. Detection Error Decision If the radiation fin temperature with the compressor on is above A°C. The error is cleared when the radiation fin temperature drops below B°C.
  • Page 100 Troubleshooting SiBE041213E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.17 Refer to P.98 Turn off the power and turn it on again to start the system. Check No.19 Refer to P.99 Has the PCB been...

  • Page 101: Output Overcurrent Detection

    SiBE041213E Troubleshooting 4.24 Output Overcurrent Detection Error Code Method of Error An output overcurrent is detected by checking the current that flows in the inverter DC section. Detection Error Decision A position signal error occurs while the compressor is running. A rotation speed error occurs while the compressor is running.
  • Page 102 Troubleshooting SiBE041213E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output Refer to P.95 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 103: Check

    SiBE041213E Check 5. Check 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. Thermistor temperature (°C) Resistance (kΩ) –20 197.8 –15 148.2...

  • Page 104: Fan Motor Connector Output Check

    Check SiBE041213E Fan Motor Connector Output Check Check No.02 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.

  • Page 105: Four Way Valve Performance Check

    SiBE041213E Check Four Way Valve Performance Check Check No.13 Turn the power off and then on again. ∗ Four way valve coil Start heating operation. Cooling / Dry : No continuity Heating : Continuity voltage at 220 - 240 Replace the outdoor unit VAC with compressor PCB.

  • Page 106: Inverter Analyzer Check

    Check SiBE041213E Inverter Analyzer Check Check No.15 Characteristics Inverter analyzer: RSUK0917C If an abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (main PCB, power module, etc.).
  • Page 107 SiBE041213E Check <42 class> Activate power transistor test operation from indoor unit. 1) Turn the power on. 2) Select FAN operation with the [MODE] button on the remote controller. 3) Press the center of the [TEMP] button and the [MODE] button at the same time. →...

  • Page 108: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiBE041213E Rotation Pulse Check on the Outdoor Unit PCB Check No.16 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.

  • Page 109: Installation Condition Check

    SiBE041213E Check Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air Change the installation suction and location or direction. discharge area. Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty? exchanger.

  • Page 110: Outdoor Fan System Check

    Check SiBE041213E 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor lead wire connector Outdoor fan running? Reconnect the connector. disconnected? Go to Check No. 16. Outdoor fan system is functioning. (R15001) 5.12 Main Circuit Short Check Check No.20 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
  • Page 111 SiBE041213E Check 42 class Tester (R12266) 50 class Tester (R14700) Service Diagnosis...

  • Page 112: Power Module Check

    Check SiBE041213E 5.13 Power Module Check Check No.22 Note: Check to make sure that the voltage between (+) and (–) of the power module is approx. 0 V before checking. Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.
  • Page 113 SiBE041213E Check 42 class Power module (R18241) 50 class Power module (R16692) Service Diagnosis...

  • Page 114: Part 7 Tips For Servicing

    SiBE041213E Part 7 Tips for Servicing 1. Tips for Servicing ................104 1.1 Pump Down Operation .................104 1.2 Forced Cooling Operation ..............104 2. Trial Operation ..................106 3. Field Settings ..................107 3.1 When 2 Units are Installed in 1 Room..........107 3.2 Model Type Setting ................107 3.3 Standby Electricity Saving..............108 3.4 Facility Setting Jumper (cooling at low outdoor temperature) ....108 3.5 Jumper Settings ...................110...

  • Page 115: Tips For Servicing

    SiBE041213E Tips for Servicing 1. Tips for Servicing Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing the unit. Detail 1. Remove the valve caps from the liquid stop valve and the gas stop valve. 2.
  • Page 116 Tips for Servicing SiBE041213E Indoor Unit ON/OFF button (SW1) (R18928) Outdoor Unit: 35 class Terminal board Screwdriver Push here (R18256) Outdoor Unit: 50 class Forced cooling operation ON/OFF switch (SW1) Push Screwdriver (R18725) Caution When pressing the switch, do not touch the terminal board. It has a high voltage and may cause electric shock.

  • Page 117: Trial Operation

    SiBE041213E Trial Operation 2. Trial Operation Outline 1. Measure the power supply voltage and make sure that it falls within the specified range. 2. Trial operation should be carried out in either cooling or heating operation. In cooling operation, select the lowest programmable temperature (18°C); in heating operation, select the highest programmable temperature (30°C).

  • Page 118: Field Settings

    Field Settings SiBE041213E 3. Field Settings When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different addresses. Both the indoor unit PCB and the wireless remote controller need alteration.

  • Page 119: Standby Electricity Saving

    SiBE041213E Field Settings Standby Electricity Saving Outline This function turns power supply OFF to the outdoor unit and sets the indoor unit into standby electricity saving mode, thus reducing the power consumption of the air conditioner. Detail For 35/50 class models, following procedure is required for turning ON the function. 1.
  • Page 120 Field Settings SiBE041213E 42 Class You can expand the operation range to –15°C by cutting the jumper on the outdoor unit PCB. If the outdoor temperature falls to –20°C or lower, the operation stops. If the outdoor temperature rises, the operation starts again. Fan motor lead wire Hook Remove the...

  • Page 121: Jumper Settings

    SiBE041213E Field Settings Jumper Settings Indoor Unit Function Jumper Jumper: connected Jumper: cut (factory set) Fan speed setting when Fan speed setting ; Fan speed setting; “0” (The fan compressor stops for Remote controller stops.) thermostat OFF. (effective only setting in cooling operation) Power failure recovery function Auto-restart...

  • Page 122: Silicon Grease On Power Transistor / Diode Bridge

    Silicon Grease on Power Transistor / Diode Bridge SiBE041213E 4. Silicon Grease on Power Transistor / Diode Bridge Outline Apply the specified silicon grease to the heat radiation part of a power transistor / diode bridge when you replace an outdoor unit PCB. The silicon grease encourages the heat radiation of a power transistor / diode bridge.

  • Page 123: Part 8 Appendix

    SiBE041213E Part 8 Appendix 1. Piping Diagrams..................113 1.1 Indoor Unit....................113 1.2 Outdoor Unit ..................113 2. Wiring Diagrams..................115 2.1 Indoor Unit....................115 2.2 Outdoor Unit ..................115 3. Removal Procedure (Booklet No.) ............117 Appendix...

  • Page 124: Piping Diagrams

    Piping Diagrams SiBE041213E 1. Piping Diagrams Indoor Unit FTXS35/42K2V1B FTXS50K2V1B INDOOR UNIT INDOOR UNIT 6.4CuT 6.4CuT HEAT EXCHANGER HEAT EXCHANGER THERMISTOR THERMISTOR CROSS FLOW FAN CROSS FLOW FAN ON HEAT EXCH. ON HEAT EXCH. FIELD PIPING FIELD PIPING 6.4CuT 6.4CuT FAN MOTOR FAN MOTOR FIELD PIPING...
  • Page 125 SiBE041213E Piping Diagrams RXS42K2V1B OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER THERMISTOR 7.9CuT 7.9CuT HEAT EXCHANGER MOTOR OPERATED THERMISTOR VALVE 4.8CuT 6.4CuT 6.4CuT 4.8CuT MUFFLER MUFFLER WITH WITH FILTER FILTER PROPELLER FAN 9.5CuT MUFFLER WITH FILTER FOUR WAY FIELD PIPING VALVE ON: HEATING (6.4CuT) LIQUID STOP...

  • Page 126: Wiring Diagrams

    Wiring Diagrams SiBE041213E 2. Wiring Diagrams Indoor Unit FTXS35/42/50K2V1B PCB3 PCB1 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 C101 TRANSMISSION CAUTION CIRCUIT NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN. t˚...
  • Page 127 SiBE041213E Wiring Diagrams RXS42K2V1B INDOOR PCB1 MRM20 IPM1 N=3 HL1 FU3 MRM10 3.15A 3.15A MRCW MR30 POWER SUPPLY t˚ t˚ t˚ ( OUTDOOR ) ( DISCHARGE ) M1F X11A OUTDOOR ( CONDENSER ) FIELD WIRING C74 , C75 , C94 : FAN MOTOR V1 , V3 , V4 : VARISTOR...

  • Page 128: Removal Procedure (Booklet No.)

    Removal Procedure (Booklet No.) SiBE041213E 3. Removal Procedure (Booklet No.) Refer to the following booklets for removal procedure. ∗FTXS35/42/50K2V1B Refer to Si041259. ∗RXS35K2V1B Refer to Si001273. ∗RXS42K2V1B Refer to Si001277. ∗RXS50K2V1B Refer to Si001274. Appendix...
  • Page 129 Revision History Month / Year Version Revised contents 05 / 2013 SiBE041213E First edition...
  • Page 130 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

This manual is also suitable for:

Ftxs42k2v1bFtxs50k2v1bRxs35k2v1bRxs42k2v1bRxs50k2v1b

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