Daikin FTXS20K2V1B Service Manual
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Daikin FTXS20K2V1B 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
[Applied Models]
Inverter Pair : Heat Pump
SiBE041134

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Summary of Contents for Daikin FTXS20K2V1B

  • Page 1 SiBE041134 Service Manual Inverter Pair Wall Mounted Type K-Series [Applied Models] Inverter Pair : Heat Pump...
  • Page 2 SiBE041134 Inverter Pair Wall Mounted Type K-Series Heat Pump Indoor Unit FTXS20K2V1B FTXS25K2V1B Outdoor Unit RXS20K2V1B RXS25K2V1B Table of Contents...

  • Page 3: Table Of Contents

    SiBE041134 1. Introduction .....................v 1.1 Safety Cautions ..................v 1.2 Used Icons ....................ix Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............3 1. Specifications ..................4 Part 3 Printed Circuit Board Connector Wiring Diagram ..... 5 1.
  • Page 4 SiBE041134 2.3 Adjusting the Airflow Direction and Rate ..........43 2.4 COMFORT AIRFLOW Operation ............45 2.5 INTELLIGENT EYE Operation ...............46 2.6 POWERFUL Operation ................48 2.7 OUTDOOR UNIT QUIET Operation............49 2.8 ECONO Operation .................50 2.9 OFF TIMER Operation ................51 2.10 ON TIMER Operation ................52 2.11 WEEKLY TIMER Operation ..............53 Part 6 Service Diagnosis.............
  • Page 5 SiBE041134 5.10 Discharge Pressure Check..............107 5.11 Outdoor Fan System Check ..............108 5.12 Main Circuit Short Check..............108 5.13 Power Module Check ................109 Part 7 Removal Procedure ............110 1. Indoor Unit...................111 1.1 Removal of Air Filters ................111 1.2 Removal of Horizontal Blade..............113 1.3 Removal of Front Panel................115 1.4 Removal of Front Grille ................116 1.5 Removal of Vertical Blade ASSYs............117...

  • Page 6: Introduction

    Introduction SiBE041134 1. Introduction Safety Cautions Cautions and Be sure to read the following safety cautions before conducting repair work. Warnings The caution items are classified into “ Warning” and “ Caution”. The “ Warning” items are especially important since they can lead to death or serious injury if they are not followed closely.
  • Page 7 SiBE041134 Introduction Warning Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place (more than 2 m). Insufficient safety measures may cause a fall accident. In case of R-410A refrigerant models, be sure to use pipes, flare nuts and tools for the exclusive use of the R-410A refrigerant.
  • Page 8 Introduction SiBE041134 1.1.2 Cautions Regarding Safety of Users Warning Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools may cause an electrical shock, excessive heat generation or fire.
  • Page 9 SiBE041134 Introduction Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug has dust or loose connection, it may cause an electrical shock or fire. Be sure to install the product correctly by using the provided standard For unitary type installation frame.

  • Page 10: Used Icons

    Introduction SiBE041134 Caution Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 MΩ or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause the water to enter the room and wet the furniture and floor.

  • Page 11: Part 1 List Of Functions

    SiBE041134 Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 12: Functions

    Functions SiBE041134 1. Functions Category Functions Category Functions Basic Inverter (with Inverter Power Control) Health & Air-Purifying Filter — Function Clean –10 Operation Limit for Cooling (°CDB) ~ 46 Photocatalytic Deodorizing Filter — Air-Purifying Filter with Photocatalytic – Operation Limit for Heating (°CWB) —...

  • Page 13: Part 2 Specifications

    SiBE041134 Part 2 Specifications 1. Specifications ..................4 Specifications...

  • Page 14: Specifications

    Specifications SiBE041134 1. Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXS20K2V1B FTXS25K2V1B Model RXS20K2V1B RXS25K2V1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.8) 2.5 (1.3 ~ 4.3) 2.5 (1.3 ~ 3.2) 2.8 (1.3 ~ 4.7) Capacity Rated (Min.

  • Page 15: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiBE041134 Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................6 2. Outdoor Unit....................8 Printed Circuit Board Connector Wiring Diagram...

  • Page 16: Indoor Unit

    Indoor Unit SiBE041134 1. Indoor Unit Connectors and PCB(1): Control PCB Other Parts 1) S6 Connector for swing motor (horizontal blade) 2) S25 Connector for INTELLIGENT EYE sensor PCB 3) S26 Connector for display PCB 4) S32 Connector for indoor heat exchanger thermistor 5) S200 Connector for fan motor 6) S403...
  • Page 17 SiBE041134 Indoor Unit PCB Detail PCB(1): Control PCB JA JC JB LED A S200 S403 FG1, FG2 2P297453-1 PCB(2): Display PCB LED3 LED2 LED1 (Solder side) RTH1 3P185701-3 PCB(3): INTELLIGENT EYE Sensor PCB 3P296737-1 Printed Circuit Board Connector Wiring Diagram...

  • Page 18: Outdoor Unit

    Outdoor Unit SiBE041134 2. Outdoor Unit Connectors and PCB (1): Filter PCB Other Parts 1) S11 Connector for main PCB 2) AC1, AC2, S Connector for terminal board 3) E1, E2 Terminal for ground wire 4) HL2, HN2 Connector for main PCB 5) HR1 Connector for reactor 6) FU1...
  • Page 19 SiBE041134 Outdoor Unit PCB Detail PCB (1): Filter PCB E1, E2 (on main PCB) 3P254234-1 PCB (2): Main PCB U VW J5 J4 S90 LED A S100 S50 2P254206-1 PCB (3): Forced Operation Button PCB S110 3P255755-1 Printed Circuit Board Connector Wiring Diagram...

  • Page 20: Part 4 Function And Control

    SiBE041134 Part 4 Function and Control 1. Main Functions..................11 1.1 Temperature Control ................11 1.2 Frequency Principle................11 1.3 Airflow Direction Control.................13 1.4 Fan Speed Control for Indoor Unit ............14 1.5 Program Dry Operation ................15 1.6 Automatic Operation................16 1.7 Thermostat Control.................17 1.8 NIGHT SET Mode ..................18 1.9 ECONO Operation .................19 1.10 INTELLIGENT EYE Operation ...............20 1.11 Inverter POWERFUL Operation .............21...

  • Page 21: Main Functions

    SiBE041134 Main Functions 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 22 Main Functions SiBE041134 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 23: Airflow Direction Control

    SiBE041134 Main Functions Airflow Direction Control Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum Dual Flap control in cooling, dry, and heating operation. <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 24: Fan Speed Control For Indoor Unit

    Main Functions SiBE041134 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 25: Program Dry Operation

    SiBE041134 Main Functions 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 26: Automatic Operation

    Main Functions SiBE041134 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 27: Thermostat Control

    SiBE041134 Main Functions Thermostat Control Thermostat control is based on the difference between the room thermistor temperature and the target temperature. 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 28: Night Set Mode

    Main Functions SiBE041134 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 29: Econo Operation

    SiBE041134 Main Functions ECONO Operation 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.

  • Page 30: Intelligent Eye Operation

    Main Functions SiBE041134 1.10 INTELLIGENT EYE Operation Outline This function detects the existence of humans in the room with a motion sensor (INTELLIGENT EYE) and reduces the capacity when there is nobody in the room in order to save electricity. Detail 1.

  • Page 31: Inverter Powerful Operation

    SiBE041134 Main Functions 1.11 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 32: Other Functions

    Main Functions SiBE041134 1.12 Other Functions 1.12.1 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 33: Function Of Thermistor

    SiBE041134 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 Exchanger temperature. The system sets the target discharge pipe temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve Thermistor opening so that the target discharge pipe temperature can be obtained.

  • Page 34: Control Specification

    Control Specification SiBE041134 3. Control Specification Mode Hierarchy Outline There are 3 modes; normal operation mode, forced operation mode and the power transistor test mode for installation and servicing. Detail Air conditioner control mode Forced operation mode Forced cooling operation Power transistor test mode Normal operation mode Cooling (includes drying)

  • Page 35: Frequency Control

    SiBE041134 Control Specification Frequency Control Outline Frequency is determined according to the difference between the room thermistor temperature and the target temperature. The function is explained as follows. 1. How to determine frequency 2. Frequency command from the indoor unit (Difference between the room thermistor temperature and the target temperature) 3.
  • Page 36 Control Specification SiBE041134 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. ∆D ∆D ∆D ∆D Temperature Temperature Temperature Temperature difference signal difference signal...

  • Page 37: Controls At Mode Changing / Start-Up

    SiBE041134 Control Specification Controls at Mode Changing / Start-up 3.3.1 Preheating Operation 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. Outdoor temperature ≥ 7°C → Control A Detail Outdoor temperature <...

  • Page 38: Discharge Pipe Temperature Control

    Control Specification SiBE041134 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not activated when defrosting.) (Hz) Frequency (sec.) Time (R13528) A (Hz) B (Hz) C (Hz) D (seconds) E (seconds)

  • Page 39: Input Current Control

    SiBE041134 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 40: Freeze-Up Protection Control

    Control Specification SiBE041134 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 41: Outdoor Fan Control

    SiBE041134 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 42: Defrost Control

    Control Specification SiBE041134 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. Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.

  • Page 43: Electronic Expansion Valve Control

    SiBE041134 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 44: Pressure Equalizing Control

    Control Specification SiBE041134 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 equalization control is activated. The electronic expansion valve opens, and develops the pressure equalization.
  • Page 45 SiBE041134 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 46: Malfunctions

    Control Specification SiBE041134 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 47: Part 5 Operation Manual

    SiBE041134 Part 5 Operation Manual 1. System Configuration................38 2. Operation Manual..................39 2.1 Remote Controller ..................39 2.2 AUTO · DRY · COOL · HEAT · FAN Operation ........41 2.3 Adjusting the Airflow Direction and Rate ..........43 2.4 COMFORT AIRFLOW Operation ............45 2.5 INTELLIGENT EYE Operation ...............46 2.6 POWERFUL Operation ................48 2.7 OUTDOOR UNIT QUIET Operation............49...

  • Page 48: System Configuration

    System Configuration SiBE041134 1. System Configuration After installation and trial operation of the room air conditioner are completed, the air conditioner should be handled and operated as described in the following pages. Every user should be informed on the correct method of operation and how to check if it can cool (or heat) well, and how to use it efficiently.

  • Page 49: Operation Manual

    SiBE041134 Operation Manual 2. Operation Manual Remote Controller Name of Parts Remote Controller Signal transmitter Receiver Display (LCD) • It displays the current settings. • To use the remote controller, aim the (In this illustration, each section is transmitter at the indoor unit. If there shown with its displays on for the is anything to block signals between purpose of explanation.)

  • Page 50: Quiet Button

    Operation Manual SiBE041134 Open the front cover MODE selector button • It selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 11 ECONO button • ECONO operation. Page 20 SWING button • Adjusting the airflow direction. Page 13 QUIET button • OUTDOOR UNIT QUIET operation.

  • Page 51: Auto · Dry · Cool · Heat · Fan Operation

    SiBE041134 Operation Manual AUTO · DRY · COOL · HEAT · FAN Operation AUTO · DRY · COOL · HEAT · FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. To start operation Press and select an operation mode.

  • Page 52: Operating Conditions

    Operation Manual SiBE041134 To change the temperature setting Press • The displayed items on the LCD will change whenever either one of the buttons is pressed. HEAT operation AUTO operation DRY or FAN operation COOL operation 10-30˚C 18-30˚C 18-32˚C The temperature setting is Press to raise the temperature and press to lower the...

  • Page 53: Adjusting The Airflow Direction And Rate

    SiBE041134 Operation Manual Adjusting the Airflow Direction and Rate Adjusting the Airflow Direction and Rate You can adjust the airflow direction to increase your comfort. To start auto swing Upper and lower airflow direction Press • “ ” is displayed on the LCD. •...
  • Page 54 Operation Manual SiBE041134 To adjust the airflow rate setting Press • Each pressing of advances the airflow rate setting in sequence. Auto Indoor unit quiet Middle low High Middle high Middle • When the airflow is set to “ ”, indoor unit quiet operation will start and the noise from the unit will become quieter.

  • Page 55: Comfort Airflow Operation

    SiBE041134 Operation Manual COMFORT AIRFLOW Operation COMFORT AIRFLOW Operation The flow of air will be in the upward direction while in COOL operation and in the downward direction while in HEAT operation, which will provide a comfortable wind that will not come in direct contact with people. To start COMFORT AIRFLOW operation Press •...

  • Page 56: Intelligent Eye Operation

    Operation Manual SiBE041134 INTELLIGENT EYE Operation INTELLIGENT EYE Operation “INTELLIGENT EYE” is the infrared sensor which detects the human movement. If nobody in the room for more than 20 minutes, the operation automatically changes to energy saving operation. To start INTELLIGENT EYE operation Press •...
  • Page 57 SiBE041134 Operation Manual INTELLIGENT EYE Operation [Example] When someone is in the When no one is in the room Someone is back in the room room 20 minutes after, start energy saving operation. Normal operation Back to normal operation. • The air conditioner is in normal •...

  • Page 58: Powerful Operation

    Operation Manual SiBE041134 POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation modes. You can get the maximum capacity. To start POWERFUL operation Press during operation. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the previous settings which were used before POWERFUL operation.

  • Page 59: Outdoor Unit Quiet Operation

    SiBE041134 Operation Manual OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during the night. To start OUTDOOR UNIT QUIET operation Press •...

  • Page 60: Econo Operation

    Operation Manual SiBE041134 ECONO Operation ECONO Operation ECONO operation is a function which enables efficient operation by limiting the maximum power consumption value. This function is useful for cases in which attention should be paid to ensure a circuit breaker will not trip when the product runs alongside other appliances. To start ECONO operation Press during operation.

  • Page 61: Off Timer Operation

    SiBE041134 Operation Manual OFF TIMER Operation OFF TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination. To use OFF TIMER operation •...

  • Page 62: On Timer Operation

    Operation Manual SiBE041134 2.10 ON TIMER Operation ON TIMER Operation To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. Press • “ ” is displayed on the LCD. •...

  • Page 63: Weekly Timer Operation

    SiBE041134 Operation Manual 2.11 WEEKLY TIMER Operation WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week. It is convenient if the WEEKLY TIMER is set according to the family’s life style. 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 64 Operation Manual SiBE041134 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 65 SiBE041134 Operation Manual WEEKLY TIMER Operation 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.

  • Page 66: Copy Mode

    Operation Manual SiBE041134 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 67 SiBE041134 Operation Manual WEEKLY TIMER Operation 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 68 Operation Manual SiBE041134 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 69: Part 6 Service Diagnosis

    SiBE041134 Part 6 Service Diagnosis 1. Troubleshooting with LED ..............60 1.1 Indoor Unit....................60 1.2 Outdoor Unit ...................60 2. Problem Symptoms and Measures ............61 3. Service Check Function ................62 4. Troubleshooting ..................65 4.1 Error Codes and Description ..............65 4.2 Indoor Unit PCB Abnormality ..............66 4.3 Freeze-up Protection Control or Heating Peak-cut Control....68 4.4 Fan Motor (DC Motor) or Related Abnormality........70 4.5 Thermistor or Related Abnormality (Indoor Unit)........72...

  • Page 70: Troubleshooting With Led

    Troubleshooting with LED SiBE041134 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 71: Problem Symptoms And Measures

    SiBE041134 Problem Symptoms and Measures 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 72: Service Check Function

    Service Check Function SiBE041134 3. Service Check Function 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature Check Method 1 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 73 SiBE041134 Service Check Function Check Method 2 1. Press the center of the [Temp] button and the [Mode] button at the same time. (R11669) 5C is displayed on the LCD. (R11821) 2. Select 5C (service check) with the [Temp] button. 3.
  • Page 74 Service Check Function SiBE041134 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 75: Troubleshooting

    SiBE041134 Troubleshooting 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 76: Indoor Unit Pcb Abnormality

    Troubleshooting SiBE041134 Indoor Unit PCB Abnormality Remote Controller Display Method of The system checks if the circuit works properly within the microcomputer of the indoor unit. Malfunction Detection Malfunction The system cannot set the internal settings. Decision Conditions Supposed Wrong models interconnected Causes Defective indoor unit PCB Disconnection of connector...
  • Page 77 SiBE041134 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the combination of the indoor and outdoor unit. Match the compatible models. ∗ To secure the connection, Check the connection of once disconnect the connector connectors (See Note.).

  • Page 78: Freeze-Up Protection Control Or Heating Peak-Cut Control

    Troubleshooting SiBE041134 Freeze-up Protection Control or Heating Peak-cut Control Remote Controller Display Method of Freeze-up protection control Malfunction During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor. Detection Heating peak-cut control During heating operation, the temperature detected by the indoor heat exchanger thermistor...
  • Page 79 SiBE041134 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Caution connectors, or parts may be damaged. Check No.01 Check the air passage.

  • Page 80: Fan Motor (Dc Motor) Or Related Abnormality

    Troubleshooting SiBE041134 Fan Motor (DC Motor) or Related Abnormality Remote Controller Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation. Detection Malfunction The detected rotation speed does not reach the demanded rotation speed of the target tap, and Decision is less than 50% of the maximum fan motor rotation speed.
  • Page 81 SiBE041134 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.03 Note: The motor may break when the Turn off the power. Refer to P.102 motor connector is disconnected (Unplug the power cable or turn while remaining power supply.

  • Page 82: Thermistor Or Related Abnormality (Indoor Unit)

    Troubleshooting SiBE041134 Thermistor or Related Abnormality (Indoor Unit) C4, C9 Remote Controller Display Method of The temperatures detected by the thermistors determine thermistor errors. Malfunction Detection Malfunction The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Decision Conditions Supposed...

  • Page 83: Refrigerant Shortage

    SiBE041134 Troubleshooting Refrigerant Shortage Remote Controller Display Method of Refrigerant shortage detection I: Malfunction Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If the refrigerant is short, the input current is lower than the normal value. Detection Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of...
  • Page 84 Troubleshooting SiBE041134 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Any thermistor Refer to P.101 Replace the thermistor(s) disconnected? position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗...

  • Page 85: Low-Voltage Detection Or Over-Voltage Detection

    SiBE041134 Troubleshooting Low-voltage Detection or Over-voltage Detection Remote Controller Display Method of Indoor Unit Malfunction The zero-cross detection of the power supply is evaluated by the indoor unit PCB. Detection 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 86 Troubleshooting SiBE041134 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. Voltage as rated? Correct the power supply. Check the connection of the compressor harness. Loose or Reconnect the harness.

  • Page 87: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    SiBE041134 Troubleshooting Signal Transmission Error (between Indoor Unit and Outdoor Unit) Remote Controller Display Method of The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked whether it is normal. Malfunction Detection Malfunction The data sent from the outdoor unit cannot be received normally, or the content of the data is Decision abnormal.
  • Page 88 Troubleshooting SiBE041134 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.102 Check the power supply voltage. Voltage as rated? Correct the power supply. Check the indoor unit - outdoor unit connection wires.

  • Page 89: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    SiBE041134 Troubleshooting Unspecified Voltage (between Indoor Unit and Outdoor Unit) Remote Controller Display Method of The supply power is detected for its requirements (different from pair type and multi type) by the Malfunction indoor / outdoor transmission signal. Detection Malfunction The pair type and multi type are interconnected.

  • Page 90: Outdoor Unit Pcb Abnormality

    Troubleshooting SiBE041134 4.10 Outdoor Unit PCB Abnormality Remote Controller Display Method of The system checks if the microprocessor is working in order. Malfunction The system checks if the zero-cross signal comes in properly. Detection Malfunction The microprocessor program runs out of control. Decision The zero-cross signal is not detected.

  • Page 91: Ol Activation (Compressor Overload)

    SiBE041134 Troubleshooting 4.11 OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection Malfunction If the error repeats, the system is shut down. Decision Reset condition: Continuous run for about 60 minutes without any other error ∗...

  • Page 92: Compressor Lock

    Troubleshooting SiBE041134 4.12 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the compressor running condition through the Malfunction position detection circuit. Detection Malfunction Operation stops due to overcurrent. Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error Conditions Supposed...

  • Page 93: Dc Fan Lock

    SiBE041134 Troubleshooting 4.13 DC Fan Lock Remote Controller Display Method of An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Malfunction Detection Malfunction The fan does not start in 15 ~ 60 seconds (depending on the model) even when the fan Decision motor is running.

  • Page 94: Input Overcurrent Detection

    Troubleshooting SiBE041134 4.14 Input Overcurrent Detection Remote Controller Display Method of An input overcurrent is detected by checking the input current value with the compressor Malfunction running. Detection Malfunction The current exceeds about 9.25 A for 2.5 seconds with the compressor running. Decision (The upper limit of the current decreases when the outdoor temperature exceeds a certain level.)

  • Page 95: Four Way Valve Abnormality

    SiBE041134 Troubleshooting 4.15 Four Way Valve Abnormality Remote Controller Display Method of The room temperature thermistor, the indoor heat exchanger thermistor, the outdoor Malfunction temperature thermistor, and the outdoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Detection Malfunction A following condition continues over 10 minutes after operating for 5 minutes.
  • Page 96 Troubleshooting SiBE041134 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.101 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.104 Harness out of connector? Reconnect the harness.

  • Page 97: Discharge Pipe Temperature Control

    SiBE041134 Troubleshooting 4.16 Discharge Pipe Temperature Control Remote Controller Display Method of An error is determined with the temperature detected by the discharge pipe thermistor. Malfunction Detection Malfunction If the temperature detected by the discharge pipe thermistor rises above A°C, the Decision compressor stops.

  • Page 98: High Pressure Control In Cooling

    Troubleshooting SiBE041134 4.17 High Pressure Control in Cooling Remote Controller Display Method of High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if Malfunction the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Detection Malfunction The temperature sensed by the outdoor heat exchanger thermistor rises above about Decision...

  • Page 99: Compressor System Sensor Abnormality

    SiBE041134 Troubleshooting 4.18 Compressor System Sensor Abnormality Remote Controller Display Method of The system checks the DC current before the compressor starts. Malfunction Detection Malfunction The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output Decision converted to voltage value) The DC voltage before compressor start-up is below 50 V.

  • Page 100: Position Sensor Abnormality

    Troubleshooting SiBE041134 4.19 Position Sensor Abnormality Remote Controller Display Method of A compressor start-up failure is detected by checking the compressor running condition through Malfunction the position detection circuit. Detection Malfunction If the error repeats, the system is shut down. Decision Reset condition: Continuous run for about 11 minutes without any other error Conditions...
  • Page 101 SiBE041134 Troubleshooting 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.105 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.107 Voltage as rated? Correct the power supply.

  • Page 102: Dc Voltage / Current Sensor Abnormality

    Troubleshooting SiBE041134 4.20 DC Voltage / Current Sensor Abnormality Remote Controller Display Method of DC voltage or DC current sensor abnormality is identified based on the compressor running Malfunction frequency and the input current. Detection Malfunction If the error repeats, the system is shut down. Decision Reset condition: Continuous run for about 60 minutes without any other error Conditions...

  • Page 103: Thermistor Or Related Abnormality (Outdoor Unit)

    SiBE041134 Troubleshooting 4.21 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Remote Controller Display Method of This fault is identified based on the thermistor input voltage to the microcomputer. Malfunction A thermistor fault is identified based on the temperature sensed by each thermistor. Detection Malfunction The thermistor input voltage is above 4.96 V or below 0.04 V with the power on.
  • Page 104 Troubleshooting SiBE041134 Troubleshooting In case of “H9” “J3” “J6” 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.101 Turn on the power again. Error displayed Reconnect the connectors again on remote or thermistors.

  • Page 105: Electrical Box Temperature Rise

    SiBE041134 Troubleshooting 4.22 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor off. Detection Malfunction With the compressor off, the radiation fin temperature is above A°C. Decision The error is cleared when the radiation fin temperature drops below B°C.
  • Page 106 Troubleshooting SiBE041134 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Be sure to turn off the power switch before connecting or disconnecting Caution Caution connectors, or parts may be damaged. connectors, or parts may be damaged. Check No.17 WARNING WARNING...

  • Page 107: Radiation Fin Temperature Rise

    SiBE041134 Troubleshooting 4.23 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is above A°C. Decision The error is cleared when the radiation fin temperature drops below B°C.
  • Page 108 Troubleshooting SiBE041134 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Be sure to turn off the power switch before connecting or disconnecting Caution Caution connectors, or parts may be damaged. connectors, or parts may be damaged. Check No.17 Turn off the power and turn it on Turn off the power and turn it on...

  • Page 109: Output Overcurrent Detection

    SiBE041134 Troubleshooting 4.24 Output Overcurrent Detection Remote Controller Display Method of An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Detection Malfunction A position signal error occurs while the compressor is running. Decision A speed error occurs while the compressor is running.
  • Page 110 Troubleshooting SiBE041134 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.105 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 111: Check

    SiBE041134 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 relationship between normal temperature and resistance is shown in the table and the graphs below.

  • Page 112: Fan Motor Connector Output Check

    Check SiBE041134 Fan Motor Connector Output Check Check No.03 Fan motor wire breakdown / short circuit check 1. Check the connector for connection. 2. Turn the power off. Ω Ω 3. Check if each resistance at the phases U - V and V - W is 90 ~ 100 (between the pins 12 - 9, and between 9 - 6).

  • Page 113: Electronic Expansion Valve Check

    SiBE041134 Check Electronic Expansion Valve Check Check No.12 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.

  • Page 114: Four Way Valve Performance Check

    Check SiBE041134 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 115: Inverter Checker" Check

    SiBE041134 Check “Inverter Checker” Check Check No.15 Characteristics 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 (control PCB, power module, etc.).

  • Page 116: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiBE041134 Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) If all the LEDs are lit uniformly, the compressor is defective. → Replace the compressor. (2) If the LEDs are not lit uniformly, check the power module. → Refer to Check No.22. (3) If NG in Check No.22, replace the power module.

  • Page 117: Installation Condition Check

    SiBE041134 Check Installation Condition Check Check No.17 Installation condition check Check the allowable Abnormal dimensions of the air Change the installation suction and location or direction. discharge area. Normal Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty?

  • Page 118: Outdoor Fan System Check

    Check SiBE041134 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 119: Power Module Check

    SiBE041134 Check 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 120: Part 7 Removal Procedure

    SiBE041134 Part 7 Removal Procedure 1. Indoor Unit...................111 1.1 Removal of Air Filters ................111 1.2 Removal of Horizontal Blade..............113 1.3 Removal of Front Panel................115 1.4 Removal of Front Grille ................116 1.5 Removal of Vertical Blade ASSYs............117 1.6 Removal of Electrical Box ..............119 1.7 Removal of Swing Motor / PCBs ............122 1.8 Removal of Indoor Heat Exchanger .............127 1.9 Removal of Fan Rotor / Fan Motor............130...

  • Page 121: Indoor Unit

    SiBE041134 Indoor Unit 1. Indoor Unit Removal of Air Filters Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Appearance features Warning Dangerous: High voltage A high voltage is applied to all the electric circuits of this product including...
  • Page 122 Indoor Unit SiBE041134 Step Procedure Points Pull out the air filter downward and remove (R16658) 3. Remove the Titanium apatite photocatalytic air-purifying filters. Air filter The Titanium apatite photocatalytic air- Titanium apatite purifying filter is photocatalytic attached to the back of air-purifying filter the air filter.

  • Page 123: Removal Of Horizontal Blade

    SiBE041134 Indoor Unit Removal of Horizontal Blade Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Open the horizontal blade. Horizontal blade (R16659) Unfasten the center The center shaft can be shaft while bending the released easily by bending...
  • Page 124 Indoor Unit SiBE041134 Step Procedure Points Remove the horizontal blade. (R16663) Removal Procedure...

  • Page 125: Removal Of Front Panel

    SiBE041134 Indoor Unit Removal of Front Panel Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Open the front panel Right side over the position where it stops.

  • Page 126: Removal Of Front Grille

    Indoor Unit SiBE041134 Removal of Front Grille Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the 2 screws, Front grille which fix the front grille to the main body.

  • Page 127: Removal Of Vertical Blade Assys

    SiBE041134 Indoor Unit Removal of Vertical Blade ASSYs Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Unfasten the right and Narrow the edges of the Hook left hooks of the fan hook to unfasten it.
  • Page 128 Indoor Unit SiBE041134 Step Procedure Points Unfasten the 3 hooks at the shaft mounting part by pressing them with a flat screwdriver. Hook (R8022) Remove the vertical Repeat the same procedure blade ASSY. to remove the vertical blade ASSY on the other side. (R8023) Removal Procedure...

  • Page 129: Removal Of Electrical Box

    SiBE041134 Indoor Unit Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Disconnect the connecting Preparation wires. Remove the front grille Service cover according to the “Removal Remove the screw of...
  • Page 130 Indoor Unit SiBE041134 Step Procedure Points Remove the screw of the wire retaining plate. (R12044) Remove the screws of Connecting wires Terminal board the terminal board and (1): black disconnect the (2): white connecting wires. (3): red ): yellow / green Connecting wires (R11639)
  • Page 131 SiBE041134 Indoor Unit Step Procedure Points Disconnect the [S200] connector for the fan motor [S200]. Release the fan motor harnesses from the hook. Hook (R16649) (R15844) Remove the screw of the electrical box. (R12048) Slide the electrical box to the right first and detach the horizontal blade from the electrical box.

  • Page 132: Removal Of Swing Motor / Pcbs

    Indoor Unit SiBE041134 Removal of Swing Motor / PCBs Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the shield plate Preparation Shield plate (2) (2).
  • Page 133 SiBE041134 Indoor Unit Step Procedure Points Unfasten the hook, and The connector of the swing disconnect the motor has a hook. connector. Press the hook with a flat screwdriver to unfasten it. (R8037) (R14847) 3. Remove the PCBs. Unfasten the hook, and Hook release the display PCB ASSY.
  • Page 134 Indoor Unit SiBE041134 Step Procedure Points Disconnect the connector [S36] from the INTELLIGENT EYE sensor PCB. [S36] (R16676) Turn over the display PCB ASSY, and Display PCB unfasten the 3 hooks to (rear side) remove the display PCB. (R16651) Disconnect the connector [S27] from the display PCB.
  • Page 135 SiBE041134 Indoor Unit Step Procedure Points 4. Remove the control PCB. Lift the shield plate (1) and unfasten the 2 hooks. Hook Slide the shield plate (1) and remove it. Shield plate (1) (R12061) Release the harnesses from the hooks. (R12062) Disconnect the 1 : black, upper...
  • Page 136 Indoor Unit SiBE041134 Step Procedure Points Release the 4 hooks. Hook Lift up the upper part of the control PCB and remove it. Control Hook (R16677) The figure shows the Refer to page for detail. control PCB. [S32] [S6]: swing motor [S26] [S6] [S25]: INTELLIGENT EYE...

  • Page 137: Removal Of Indoor Heat Exchanger

    SiBE041134 Indoor Unit Removal of Indoor Heat Exchanger Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Disconnect the refrigerant Preparation piping. Remove the electrical box according to the “Removal Remove the screws of Electrical Box”.
  • Page 138 Indoor Unit SiBE041134 Step Procedure Points Disconnect the flare nut for liquid piping. (R12178) 2. Remove the indoor heat exchanger. Remove the indoor unit from the installation plate. Liquid piping Gas piping (R12179) Unfasten the hook of the piping fixture on the Auxiliary piping Piping fixture back of the indoor unit.
  • Page 139 SiBE041134 Indoor Unit Step Procedure Points Widen the auxiliary piping to the extent of Auxiliary piping 10° ~ 20°. (R8040) Remove the screw on the left side and Caution Hook Hook unfasten the hook on When removing or the rear side. reassembling the indoor heat exchanger, be sure to wear gloves or wrap it with cloth...

  • Page 140: Removal Of Fan Rotor / Fan Motor

    Indoor Unit SiBE041134 Removal of Fan Rotor / Fan Motor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the right side Preparation panel. Remove the indoor heat exchanger according to the Remove the screw of...
  • Page 141 SiBE041134 Indoor Unit Step Procedure Points 2. Remove the fan rotor and the fan motor. Fan rotor The fan motor has 3 projections on the right side. Fan motor The fan rotor has a rotating shaft on the left side. (R8047) Remove the fan rotor.
  • Page 142 Indoor Unit SiBE041134 Step Procedure Points Unfasten the 2 hooks of the motor cover. Hook Motor cover (R8051) Pull out the fan motor The magnet of the fan motor from the fan rotor to is united with the fan rotor. Fan motor Magnet Coil...

  • Page 143: Exchange Of Piping Direction (Drain Hose)

    SiBE041134 Indoor Unit 1.10 Exchange of Piping Direction (Drain Hose) Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the heat insulation fixing screw Drain hose on the right side and remove the drain hose.

  • Page 144: Outdoor Unit

    Outdoor Unit SiBE041134 2. Outdoor Unit Removal of Outer Panels / Fan Motor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Appearance features (R7186) Take care not to cut your finger by the fins of the outdoor heat exchanger.
  • Page 145 SiBE041134 Outdoor Unit Step Procedure Points Remove the 2 screws Top panel and lift the top panel. (R7190) Remove the drip proof Drip proof plate plate. (R7191) Remove the 4 screws and remove the discharge grille. Discharge grille (R7192) The discharge grille has 4 hooks.
  • Page 146 Outdoor Unit SiBE041134 Step Procedure Points Remove the 8 screws of the front panel. (R11825) Front panel Unfasten the hooks. The front panel has 4 hooks. Pull and remove the front panel. Hook (R11826) Removal Procedure...
  • Page 147 SiBE041134 Outdoor Unit Step Procedure Points 3. Remove the fan motor. Nut size: M6 Remove the nut of the outdoor fan. 10 mm (R12236) Outdoor fan (R14205) Remove the outdoor When reassembling, align fan. mark of the outdoor fan with the D-cut section of the motor shaft.
  • Page 148 Outdoor Unit SiBE041134 Step Procedure Points Disconnect the connector for the fan motor [S70]. (R16678) [S70] Release the fan motor Fan motor lead wire from the hook. lead wire (R11832) Removal Procedure...
  • Page 149 SiBE041134 Outdoor Unit Step Procedure Points Remove the screw and remove the fan motor fixing frame. Fan motor fixing frame (R11833) (R12314) When reassembling, fit the lower hooks into the bottom frame. (R7206) Removal Procedure...
  • Page 150 Outdoor Unit SiBE041134 Step Procedure Points Open the hooks and When reassembling, put the release the fan motor fan motor lead wire through lead wire. the back of the fan motor (so as not to be entangled with the outdoor fan). (R11835) Lead wire Outdoor fan...
  • Page 151 SiBE041134 Outdoor Unit Step Procedure Points Remove the 4 screws Right side panel on the right side panel. (R12163) Remove the screw near the stop valves. (R11839) Unfasten the hook on When reassembling, make the rear side. sure to fit the hook. (R11842) Removal Procedure...
  • Page 152 Outdoor Unit SiBE041134 Step Procedure Points Lift up the right side When reassembling, make panel and remove it. sure to fit the hook. Hook (R12272) Lift up the guard net Guard net and remove it. (R11841) Removal Procedure...

  • Page 153: Removal Of Electrical Box

    SiBE041134 Outdoor Unit Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Disconnect the Preparation connector for the Remove the panels and overload protector disconnect the connector for [S40].
  • Page 154 Outdoor Unit SiBE041134 Step Procedure Points Disconnect the relay connector for the compressor. (R11845) Disconnect the connector for the electronic expansion valve coil [S20]. [S20] (R11847) Cut the clamp. (R11850) Pull out the outdoor Be careful not to lose the clip heat exchanger for the thermistor.
  • Page 155 SiBE041134 Outdoor Unit Step Procedure Points Release the discharge Be careful not to lose the clip pipe thermistor. for the thermistor. Clip (R12279) Discharge pipe thermistor (R11849) Lift and remove the Electrical Box electrical box. (R11852) Removal Procedure...

  • Page 156: Removal Of Pcbs

    Outdoor Unit SiBE041134 Removal of PCBs Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the main PCB. You can remove the main PCB when you disconnect Feature of the main the lead wires on the terminal board without...
  • Page 157 SiBE041134 Outdoor Unit Step Procedure Points Pull out the forced Be careful of a sharp operation button PCB. protrusion at the back of the Disconnect the forced operation button connector [S110] and PCB. remove the forced operation button PCB. [S110] Forced operation button PCB (R16447) Disconnect the relay...
  • Page 158 Outdoor Unit SiBE041134 Step Procedure Points Release the harness. (R11859) Cut the clamps at the 2 locations. (R11860) Disconnect the connector for the filter PCB [S10]. [S10] (R11861) Removal Procedure...
  • Page 159 SiBE041134 Outdoor Unit Step Procedure Points Disconnect the connectors for the [S100] magnetic relay [S50] and for the forced operation button PCB [S100]. [S50] (R11862) Disconnect the connector for the filter [HN3] PCB [HL3] [HN3]. [HL3] (R11863) Release the harnesses from the hook.
  • Page 160 Outdoor Unit SiBE041134 Step Procedure Points Remove the 6 screws. (R11866) Unfasten the 4 hooks and remove the main PCB. (R11867) Refer to page 9 for detail. [S50] [S100] [S10] [HL3] [HN3]: filter PCB [S20]: electronic expansion valve coil [HN3] [HL3] [S40]: overload protector [S80]...
  • Page 161 SiBE041134 Outdoor Unit Step Procedure Points 2. Remove the filter PCB. Release the harnesses from the hook. Filter PCB (R11869) Cut the clamp. (R11871) Release the harnesses from the hook. (R11872) Removal Procedure...
  • Page 162 Outdoor Unit SiBE041134 Step Procedure Points Release the harnesses from the hooks. (R11873) Remove the screw. (R11874) Unfasten the 2 hooks. Filter PCB (R11876) Lift and pull out the filter PCB. (R11877) Removal Procedure...
  • Page 163 SiBE041134 Outdoor Unit Step Procedure Points Feature of the filter Refer to page 9 for detail. (R11878) Removal Procedure...

  • Page 164: Removal Of Reactor / Partition Plate

    Outdoor Unit SiBE041134 Removal of Reactor / Partition Plate Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the reactor. Preparation Reactor Remove the outer panels Remove the screw and according to the “Removal of remove the reactor.
  • Page 165 SiBE041134 Outdoor Unit Step Procedure Points The partition plate has a hook on the lower side. Lift and pull the partition plate to remove. (R12280) When reassembling, fit the lower hook into the bottom frame. (R11883) Removal Procedure...

  • Page 166: Removal Of Sound Blankets

    Outdoor Unit SiBE041134 Removal of Sound Blankets Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the sound Since the piping ports are blanket (top). torn easily, remove the sound blanket carefully.
  • Page 167 SiBE041134 Outdoor Unit Step Procedure Points Pull the sound blanket (inner) out. Sound blanket (inner) (R11887) Pull the sound blanket (bottom) out. Sound blanket (bottom) (R11888) Removal Procedure...

  • Page 168: Removal Of Four Way Valve

    Outdoor Unit SiBE041134 Removal of Four Way Valve Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Pull out the electronic expansion valve coil. Electronic expansion valve coil (R7233) Remove the terminal...
  • Page 169 SiBE041134 Outdoor Unit Step Procedure Points Remove the screw and Four way valve coil remove the four way Warning valve coil. Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine. Warning If the refrigerant gas leaks during work, ventilate the...
  • Page 170 Outdoor Unit SiBE041134 Step Procedure Points Note: Do not use a metal saw for cutting pipes by all means because the sawdust comes into the circuit. When withdrawing the pipes, be careful not to pinch them firmly with pliers. The pipes may get deformed.

  • Page 171: Removal Of Compressor

    SiBE041134 Outdoor Unit Removal of Compressor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the 2 nuts of the compressor. Warning Be careful not to get yourself burnt with pipes and other parts that are heated by the gas brazing machine.
  • Page 172 Outdoor Unit SiBE041134 Step Procedure Points Heat up the brazed part Note: of the suction side and Do not use a metal saw for disconnect. cutting pipes by all means because the sawdust comes into the circuit. When withdrawing the pipes, be careful not to pinch them firmly with pliers.

  • Page 173: Part 8 Trial Operation And Field Settings

    SiBE041134 Part 8 Trial Operation and Field Settings 1. Pump Down Operation................164 2. Forced Cooling Operation ..............165 3. Trial Operation ..................166 4. Field Settings ..................167 4.1 Model Type Setting ................167 4.2 When 2 Units are Installed in 1 Room..........167 4.3 Standby Electricity Saving..............168 4.4 Facility Setting Jumper (cooling at low outdoor temperature) ....168 4.5 Jumper Settings ...................169 5.

  • Page 174: Pump Down Operation

    Pump Down Operation SiBE041134 1. 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) Carry out forced cooling operation.

  • Page 175: Forced Cooling Operation

    SiBE041134 Forced Cooling Operation 2. Forced Cooling Operation Item Forced Cooling Conditions The forced cooling operation is allowed when both of the following conditions are met. 1) The outdoor unit is not abnormal and not in the 3-minute standby mode. 2) The outdoor unit is not operating.

  • Page 176: Trial Operation

    Trial Operation SiBE041134 3. Trial Operation Outline 1. Measure the 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. 3. Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as flap movement, are working properly.

  • Page 177: Field Settings

    SiBE041134 Field Settings 4. Field Settings Model Type Setting ARC466A6 This remote controller is common to the heat pump model and cooling only model. Use the DIP switch on the remote controller to set the heat pump model. Set the DIP switch to H/P as shown in the illustration. (The factory set is the heat pump side.) DIP switch (R12275)

  • Page 178: Standby Electricity Saving

    Field Settings SiBE041134 Standby Electricity Saving Outline This function turns OFF the power supply to the outdoor unit and sets the indoor unit into energy-saving mode, thus reducing the power consumption of the air conditioner. Detail The standby electricity saving function is turned OFF before shipping. The following procedure is required for turning ON the function.

  • Page 179: Jumper Settings

    SiBE041134 Field Settings Jumper Settings Jumper Function When connected When cut (factory setting) Fan speed setting Fan speed setting ; Fan speed setting; “0” (The fan (on indoor unit PCB) when compressor Remote controller stops.) stops for thermostat setting OFF. (effective only in cooling operation) Power failure Auto-restart...

  • Page 180: Application Of Silicon Grease To A Power Transistor And A Diode Bridge

    Application of Silicon Grease to a Power Transistor and a Diode Bridge SiBE041134 5. Application of Silicon Grease to a Power Transistor and a Diode Bridge Applicable All outdoor units using an inverter type compressor for room air conditioner. Models When the printed circuit board (PCB) of an outdoor unit is replaced, it is required that silicon grease (*1) be precisely applied to the heat radiation part (the contact point to the radiation fin) of the power transistor and the diode bridge.

  • Page 181: Part 9 Appendix

    SiBE041134 Part 9 Appendix 1. Piping Diagrams..................172 1.1 Indoor Unit....................172 1.2 Outdoor Unit ..................172 2. Wiring Diagrams..................173 2.1 Indoor Unit....................173 2.2 Outdoor Unit ..................173 Appendix...

  • Page 182: Piping Diagrams

    Piping Diagrams SiBE041134 1. Piping Diagrams Indoor Unit FTXS20/25K2V1B INDOOR UNIT HEAT EXCHANGER 7.0CuT 4.8CuT THERMISTOR 7.0CuT ON HEAT EXCH. 7.0CuT CROSS FLOW FAN FIELD PIPING (6.4CuT) FAN MOTOR FIELD PIPING 9.5CuT (9.5CuT) REFRIGERANT FLOW COOLING HEATING 4D058926M Outdoor Unit RXS20/25K2V1B OUTDOOR UNIT OUTDOOR TEMPERATURE...

  • Page 183: Wiring Diagrams

    SiBE041134 Wiring Diagrams 2. Wiring Diagrams Indoor Unit FTXS20/25K2V1B PCB 2 PCB 1 FIELD WIRING. 1 1 1 TRANSMISSION GRN/YLW LED1 LED1 LED1 CIRCUIT LED2 LED2 LED2 RECTIFIER LED3 LED3 LED3 OUTDOOR – MR10 CAUTION NOTE THAT OPERATION WILL 3.15A RESTART AUTOMATICALLY IF t°...
  • Page 184 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.

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