Daikin FVXS25FV1B Service Manual
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Daikin FVXS25FV1B Service Manual

Inverter pair floor standing type
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See also: Operating Manual , Installation Manual
Inverter Pair
Floor Standing Type F-Series
[Applied Models]
Inverter Pair : Cooling Only
Inverter Pair : Heat Pump
SiBE06 - 708

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Summary of Contents for Daikin FVXS25FV1B

  • Page 1 SiBE06 - 708 Inverter Pair Floor Standing Type F-Series [Applied Models] Inverter Pair : Cooling Only Inverter Pair : Heat Pump...
  • Page 2 SiBE06-708 Inverter Pair F-Series Cooling Only Indoor Unit FVXS25FV1B FVXS35FV1B FVXS50FV1B Outdoor Unit RKS25F2V1B RKS35F2V1B RKS50F2V1B Heat Pump Indoor Unit FVXS25FV1B FVXS35FV1B FVXS50FV1B Outdoor Unit RXS25F2V1B RXS35F2V1B RXS50F2V1B Table of Contents...

  • Page 3: Table Of Contents

    SiBE06-708 1. Introduction .....................v 1.1 Safety Cautions ..................v 1.2 Used Icons ....................ix Part 1 List of Functions ..............1 1. List of Functions ..................2 Part 2 Specifications ..............5 1. Specifications ..................6 1.1 Cooling Only.....................6 1.2 Heat Pump ....................8 Part 3 Printed Circuit Board Connector Wiring Diagram ...
  • Page 4 SiBE06-708 Part 5 System Configuration............51 1. System Configuration................52 2. Instruction....................53 2.1 Safety Precautions .................53 2.2 Names of Parts..................55 2.3 Preparation Before Operation ..............58 2.4 AUTO • DRY • COOL • HEAT • FAN Operation ........61 2.5 Adjusting the Air Flow Direction .............63 2.6 POWERFUL Operation ................65 2.7 OUTDOOR UNIT QUIET Operation............66 2.8 ECONO Operation .................67...
  • Page 5 SiBE06-708 Part 7 Removal Procedure ............147 1. Indoor Unit...................148 1.1 Removal of the Air Filter / Front Panel ..........148 1.2 Removal of the Horizontal Blade............152 1.3 Removal of the Electrical Box ..............153 1.4 Removal of the PCB................155 1.5 Removal of the Vertical Blade ..............159 1.6 Removal of the Heat Exchanger ............162 1.7 Removal of the Fan Rotor / Fan Motor..........163 2.

  • Page 6: Introduction

    SiBE06-708 Introduction 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 Introduction SiBE06-708 Warning Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place (more than 2m). Insufficient safety measures may cause a fall accident. In case of R410A refrigerant models, be sure to use pipes, flare nuts and tools for the exclusive use of the R410A refrigerant.
  • Page 8 SiBE06-708 Introduction 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 Introduction SiBE06-708 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

    SiBE06-708 Introduction 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 Introduction SiBE06-708...

  • Page 12: Part 1 List Of Functions

    SiBE06-708 Part 1 List of Functions 1. List of Functions ..................2 List of Functions...

  • Page 13: List Of Functions

    List of Functions SiBE06-708 List of Functions Category Functions Category Functions Basic Inverter (with Inverter Power Control) Health & Function Clean Air Purifying Filter — –10 Operation Limit for Cooling (°CDB) Operation Limit for Heating (°CWB) — Photocatalytic Deodorizing Filter —...
  • Page 14 SiBE06-708 List of Functions Category Functions Category Functions Basic Inverter (with Inverter Power Control) Health & Function Clean Air Purifying Filter — –10 Operation Limit for Cooling (°CDB) –15 Operation Limit for Heating (°CWB) Photocatalytic Deodorizing Filter — Air Purifying Filter with Photocatalytic PAM Control —...
  • Page 15 List of Functions SiBE06-708 List of Functions...

  • Page 16: Part 2 Specifications

    SiBE06-708 Part 2 Specifications 1. Specifications ..................6 1.1 Cooling Only.....................6 1.2 Heat Pump ....................8 Specifications...

  • Page 17: Specifications

    Specifications SiBE06-708 Specifications 1.1 Cooling Only 50Hz 220-230-240V Indoor Units FVXS25FV1B FVXS35FV1B Model Outdoor Units RKS25F2V1B RKS35F2V1B 2.5 (1.3~3.0) 3.5 (1.40~3.80) Capacity Btu/h 8,500 (4,400~10,200) 11,900 (4,800~13,000) Rated (Min.~Max.) kcal/h 2,150 (1,120~2,580) 3,010 (1,200~3,270) Moisture Removal Running Current (Rated) 3.5-3.3-3.2 4.9-4.7-4.5...
  • Page 18 SiBE06-708 Specifications 50Hz 220-230-240V Indoor Units FVXS50FV1B Model Outdoor Units RKS50F2V1B 5.0 (1.4~5.9) Capacity Btu/h 17,100 (4,800~19,100) Rated (Min.~Max.) kcal/h 4,300 (1,200~4,820) Moisture Removal Running Current (Rated) 7.2-6.8-6.6 Power Consumption 1,550 (500~2,000) Rated (Min.~Max.) Power Factor 99.2-99.1-99.4 COP (Rated) 3.23 φ...

  • Page 19: Heat Pump

    Specifications SiBE06-708 Heat Pump 50Hz 220-230-240V Indoor Units FVXS25FV1B FVXS35FV1B Model RXS25F2V1B RXS35F2V1B Outdoor Units Cooling Heating Cooling Heating 2.5 (1.3~3.0) 3.4 (1.3~4.5) 3.5 (1.4~3.8) 4.5 (1.4~5.0) Capacity Btu/h 8,500 (4,400~10,200) 11,600 (4,400~17,100) 11,900 (4,800~13,000) 15,400 (4,800~17,100) Rated (Min.~Max.) kcal/h...
  • Page 20 SiBE06-708 Specifications 50Hz 220-230-240V Indoor Units FVXS50FV1B Model RXS50F2V1B Outdoor Units Cooling Heating 5.0 (1.4~5.6) 5.8 (1.4~8.1) Capacity Btu/h 17,100 (4,800~19,100) 19,800 (4,800~27,600) Rated (Min.~Max.) kcal/h 4,300 (1,200~4,820) 4,990 (1,200~6,970) — Moisture Removal Running Current (Rated) 7.2-6.8-6.6 7.3-7.0-6.7 Power Consumption 1,550 (500~2,000) 1,600 (500~2,600) Rated (Min.~Max.)
  • Page 21 Specifications SiBE06-708 Specifications...

  • Page 22: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiBE06-708 Part 3 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram........12 1.1 Indoor Unit....................12 1.2 Outdoor Unit ...................15 Printed Circuit Board Connector Wiring Diagram...

  • Page 23: Printed Circuit Board Connector Wiring Diagram

    Printed Circuit Board Connector Wiring Diagram SiBE06-708 1. Printed Circuit Board Connector Wiring Diagram Indoor Unit Connectors PCB(1) (Sensor PCB) Connector for control PCB PCB(2) (Control PCB) Connector for fan motor Connector for centralized control Connector for service PCB Connector for lower air outlet motor Connector for swing motor Connector for display PCB Connector for sensor PCB...
  • Page 24 SiBE06-708 Printed Circuit Board Connector Wiring Diagram PCB Detail PCB(1): Sensor PCB 3P191450 PCB(2): Control PCB LED A 2P191446 PCB(3): Service PCB PCB(4): Display PCB LED1 LED2 3P191447 3P191448 Printed Circuit Board Connector Wiring Diagram...

  • Page 25: Outdoor Unit

    Printed Circuit Board Connector Wiring Diagram SiBE06-708 Outdoor Unit 1.2.1 RK(X)S 25/35 F Connectors PCB (1) (Filter PCB) Connector for control PCB PCB (2) (Control PCB) Connector for filter PCB Connector for electronic expansion valve coil Connector for compressor motor Connector for overload protector Connector for fan motor Connector for four way valve coil...
  • Page 26 SiBE06-708 Printed Circuit Board Connector Wiring Diagram PCB Detail PCB(1): Filter PCB V3 V2 FU3(20A) (R4293) PCB(2): Control PCB (outdoor unit) S40 LED A FU2(3.15A) FU1(3.15A) (R4780) Printed Circuit Board Connector Wiring Diagram...
  • Page 27 Printed Circuit Board Connector Wiring Diagram SiBE06-708 1.2.2 RK(X)S 50 F Connectors PCB(1)(Main PCB) Connector for terminal strip (indoor-outdoor transmission) Connector for electronic expansion valve coil Connector for overload protector 4) S51, S101 Connector for service monitor PCB Connector for fan motor Connector for four way valve coil Connector for thermistors (outdoor air, heat exchanger, and discharge pipe)
  • Page 28 SiBE06-708 Printed Circuit Board Connector Wiring Diagram PCB Detail PCB(1): Main PCB (outdoor unit) FU2(3.15A) (30A) S101 FU3(3.15A) (R5201) PCB(2): Service Monitor PCB LED A S102 3P169059 Printed Circuit Board Connector Wiring Diagram...
  • Page 29 Printed Circuit Board Connector Wiring Diagram SiBE06-708 Printed Circuit Board Connector Wiring Diagram...

  • Page 30: Part 4 Function And Control

    SiBE06-708 Part 4 Function and Control 1. Main Functions..................20 1.1 Frequency Principle................20 1.2 Wide Angle Louvers and Auto-Swing.............22 1.3 Fan Speed Control for Indoor Units............23 1.4 Programme Dry Function ...............24 1.5 Automatic Operation................25 1.6 Thermostat Control.................26 1.7 Night Set Mode..................27 1.8 Inverter POWERFUL Operation .............28 1.9 Other Functions..................29 1.10 WEEKLY TIMER ..................30...

  • Page 31: Main Functions

    Main Functions SiBE06-708 1. Main Functions Note: See the list of functions for the functions applicable to different models. Frequency Principle Main Control The compressor is frequency-controlled during normal operation. The target frequency is set by the following 2 parameters coming from the operating indoor unit: Parameters The load condition of the operating indoor unit The difference between the room temperature and the set temperature...
  • Page 32 SiBE06-708 Main Functions Inverter Features The inverter provides the following features: The regulating capacity can be changed according to the changes in the outside temperature and cooling/heating load. Quick heating and quick cooling The compressor rotational speed is increased when starting the heating (or cooling). This enables a quick set temperature.

  • Page 33: Wide Angle Louvers And Auto-Swing

    Main Functions SiBE06-708 Wide Angle Louvers and Auto-Swing Wide-Angle The louvres, made of elastic synthetic resin, provide a wide range of airflow that guarantees a comfortable air distribution. Louvres right and left (manual) upper air outlet (R6827) lower air outlet (R6828) Auto-Swing The following table explains the auto-swing process for heating, cooling, dry and fan :...

  • Page 34: Fan Speed Control For Indoor Units

    SiBE06-708 Main Functions Fan Speed Control for Indoor Units Control Mode The airflow rate can be automatically controlled depending on the difference between the set temperature and the room temperature. This is done through phase control and Hall IC control. For more information about Hall IC, refer to the troubleshooting for fan motor on page 91.

  • Page 35: Programme Dry Function

    Main Functions SiBE06-708 Programme Dry Function Programme dry function removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and air flow volume, the temperature adjustment and fan adjustment buttons are inoperable in this mode. In Case of The microcomputer automatically sets the temperature and fan settings.

  • Page 36: Automatic Operation

    SiBE06-708 Main Functions Automatic Operation Automatic Cooling / Heating Function (Heat Pump Only) When the AUTO mode is selected with the remote controller, the microcomputer automatically determines the operation mode from cooling and heating according to the room temperature and setting temperature at the time of the operation startup, and automatically operates in that mode.

  • Page 37: Thermostat Control

    Main Functions SiBE06-708 Thermostat Control Thermostat control is based on the difference between the room temperature and the setpoint. Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON Condition The temperature difference is above the zone C after being in the zone A. The system resumes from defrost control in any zones except A.

  • Page 38: Night Set Mode

    SiBE06-708 Main Functions Night Set Mode When the OFF timer is set, the Night Set function automatically activates. The Night Set circuit maintains the airflow setting made by users. The Night Set The Night Set function continues heating or cooling the room at the set temperature for the first Circuit one hour, then automatically raises the temperature setting slightly in the case of cooling, or lowers it slightly in the case of heating, for economical operations.

  • Page 39: Inverter Powerful Operation

    Main Functions SiBE06-708 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. Details of the When POWERFUL button is pushed in each operation mode, the fan speed/setting temperature will be converted to the following states in a period of twenty minutes.

  • Page 40: Other Functions

    SiBE06-708 Main Functions Other Functions 1.9.1 Hot Start Function Heat Pump Only In order to prevent the cold air blast that normally comes when heating is started, the temperature of the heat exchanger of the indoor unit is detected, and either the air flow is stopped or is made very weak thereby carrying out comfortable heating of the room.

  • Page 41: 1.10 Weekly Timer

    Main Functions SiBE06-708 1.9.6 Self-Diagnosis Digital Display The microcomputer continuously monitors main operating conditions of the indoor unit, outdoor unit and the entire system. When an abnormality occur, the LCD remote controller displays error code. These indications allow prompt maintenance operations. 1.9.7 Auto-restart Function Even if a power failure (including one for just a moment) occurs during the operation, the...

  • Page 42: Function Of Thermistor

    SiBE06-708 Function of Thermistor Function of Thermistor Electrontic expansion valve Four way valve Compressor (R5204) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. Exchanger The system sets a target discharge temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so that the Thermistor target discharge temperature can be obtained.

  • Page 43: Control Specification

    Control Specification SiBE06-708 3. Control Specification Mode Hierarchy Outline There are two modes; the mode selected in user’s place (normal air conditioning mode) and forced operation mode for installation and providing service. Detail 1. For heat pump model There are following modes; stop, cooling (includes drying), heating (include defrosting) Air conditioner control mode Forced operating mode Forced cooling (for Pump Down Operation)

  • Page 44: Frequency Control

    SiBE06-708 Control Specification Frequency Control Outline Frequency will be determined according to the difference between room and set temperature. The function is explained as follows. 1. How to determine frequency. 2. Frequency command from an indoor unit. (The difference between a room temperature and the temperature set by the remote controller.) 3.
  • Page 45 Control Specification SiBE06-708 Indoor Frequency Command (∆D signal) The difference between a room temperature and the temperature set by the remote controller will be taken as the “∆D signal” and is used for frequency command. ∆D ∆D ∆D ∆D Temperature Temperature Temperature Temperature...

  • Page 46: Controls At Mode Changing / Start-Up

    SiBE06-708 Control Specification Controls at Mode Changing / Start-up 3.3.1 Preheating Operation Outline 25/35 class Operate the inverter in the open phase operation with the conditions including the preheating command from the discharge pipe temperature. 50 class Operate the inverter in the open phase operation with the conditions including the outdoor air temperature, discharge pipe temperature, and fin temperature (internal temperature of PM1).
  • Page 47 Control Specification SiBE06-708 3.3.2 Four Way Valve Switching Outline During the heating operation current must be conducted and during cooling and defrosting current must not be conducted. In order to eliminate the switching sound (as the four way valve coil switches from ON to OFF) when the heating is stopped, the delay switch of the four way valve must be carried out after the operation stopped.
  • Page 48 SiBE06-708 Control Specification 3.3.3 Four Way Valve Operation Compensation Outline At the beginning of the operation as the four way valve is switched, acquire the differential pressure required for activating the four way valve by having output the operating frequency, which is more than a certain fixed frequency, for a certain fixed time.

  • Page 49: Discharge Pipe Temperature Control

    Control Specification SiBE06-708 3.3.4 3 Minutes Stand-by Prohibit to turn ON the compressor for 3 minutes after turning it off. (Except when defrosting.) 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency must be set as follows.

  • Page 50: Input Current Control

    SiBE06-708 Control Specification Input Current Control Outline The microcomputer calculates the input current during the compressor is running, and set the frequency upper limit from such input current. In case of heat pump model, this control is the upper limit control function of the frequency which takes priority of the lower limit of four way valve activating compensation.

  • Page 51: Freeze-Up Protection Control

    Control Specification SiBE06-708 Freeze-up Protection Control Outline During cooling operation, the signals being sent from the indoor unit allow the operating frequency limitation and then prevent freezing of the indoor heat exchanger. (The signal from the indoor unit must be divided into the zones as the followings. Detail Conditions for Start Controlling Judge the controlling start with the indoor heat exchanger temperature after 2 sec from...

  • Page 52: Fan Control

    SiBE06-708 Control Specification Fan Control Outline Fan control is carried out according to the following condition. 1. Fan ON control for electric component cooling fan 2. Fan control when defrosting 3. Fan OFF delay when stopped 4. Fan control for maintaining pressure difference 5.
  • Page 53 Control Specification SiBE06-708 25/35 class 86Hz 74Hz 30Hz PI control Frequency 60sec. 60sec. 50sec. 660sec. 50sec. Compressor Four way valve 5sec. 5sec. Outdoor temp. ≥ 0˚C Outdoor temp. < 0˚C 450pulse 350pulse 450pulse Electronic expansion valve opening Initial opening (R6930) 50 class 90Hz 55Hz...

  • Page 54: Electronic Expansion Valve Control

    SiBE06-708 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 55: Discharge Pipe

    Control Specification SiBE06-708 3.11.1 Fully Closing with Power ON Initialize the electronic expansion valve when turning on the power, set the opening position and develop pressure equalizing. 3.11.2 Pressure Equalization Control When the compressor is stopped, open and close the electronic expansion valve and develop pressure equalization.
  • Page 56 SiBE06-708 Control Specification 3.11.7 Control when frequency is changed When the target discharge pipe temperature control is active, if the target frequency is changed for a specified value in a certain time period, cancel the target discharge pipe temperature control and change the target opening of the electronic expansion valve according to the shift. 3.11.8 Target Discharge Pipe Temperature Control Obtain the target discharge pipe temperature from the indoor and outdoor heat exchanger...

  • Page 57: 3.12 Malfunctions

    Control Specification SiBE06-708 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction may occur either in the thermistor or current transformer (CT) system. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Fin thermistor 4. Outside air thermistor 3.12.2 Detection of Overload Over Current...

  • Page 58: Forced Operation Mode

    SiBE06-708 Control Specification 3.13 Forced Operation Mode Outline Forced operating mode includes only forced cooling. Detail Forced Cooling Item Forced Cooling Forced operation 1) The outdoor unit is not abnormal and not in allowing conditions the 3-minute stand-by mode. 2) The operating mode of the outdoor unit is the stop mode.

  • Page 59: 3.14 Additional Function

    Control Specification SiBE06-708 3.14 Additional Function 3.14.1 POWERFUL Operation Mode Compressor operating frequency is increased to PI Max. (Max. Hz of operating room) and outdoor unit airflow rate is increased. 3.14.2 Voltage Detection Function Power supply voltage is detected each time equipment operation starts. Function and Control...

  • Page 60: Facility Setting Switch (Cooling At Low Outdoor Temperature)

    SiBE06-708 Control Specification 3.15 Facility Setting Switch (cooling at low outdoor temperature) Outline This function is limited only for facilities (the target of air conditioning is equipment (such as computer)). Never use it in a residence or office (the space where there is a human). Detail You can expand the operation range to –15°C by cutting jumper 8 (25/35 class) or, turning on switch B (SW4) (50 class) on the PCB.
  • Page 61 Control Specification SiBE06-708 Function and Control...

  • Page 62: Part 5 System Configuration

    SiBE06-708 Part 5 System Configuration 1. System Configuration................52 2. Instruction....................53 2.1 Safety Precautions .................53 2.2 Names of Parts..................55 2.3 Preparation Before Operation ..............58 2.4 AUTO • DRY • COOL • HEAT • FAN Operation ........61 2.5 Adjusting the Air Flow Direction .............63 2.6 POWERFUL Operation ................65 2.7 OUTDOOR UNIT QUIET Operation............66 2.8 ECONO Operation .................67...

  • Page 63: System Configuration

    System Configuration SiBE06-708 1. System Configuration After the installation and test operation of the room air conditioner have been completed, it should be operated and handled as described below. Every user would like to know the correct method of operation of the room air conditioner, to check if it is capable of cooling (or heating) well, and to know a clever method of using it.

  • Page 64: Instruction

    • Do not attempt to repair, relocate, modify or reinstall the air conditioner by yourself. Incorrect work will cause electric shocks, fire etc. For repairs and reinstallation, consult your Daikin dealer for advice and information. • The refrigerant used in the air conditioner is safe. Although leaks should not occur, if for some reason any refrigerant happens to leak into the room, make sure it does not come in contact with any flame as of gas heaters, kerosene heaters or gas range.
  • Page 65 Instruction SiBE06-708 • Do not block air inlets nor outlets. Impaired air flow may result in insufficient performance or trouble. • Do not stand or sit on the outdoor unit. Do not place any object on the unit to avoid injury, do not remove the fan guard.

  • Page 66: Names Of Parts

    SiBE06-708 Instruction Names of Parts Names of parts Indoor Unit Opening the Front Panel How to open the front panel: (page 26.) Air outlet selection switch • This setting blows air from upper outlet only. This setting automatically decides a blow •...
  • Page 67 Instruction SiBE06-708 Outdoor Unit 25/35 class 50 class Indoor Unit 1. Titanium Apatite Photocatalytic • The operation mode refers to the following Air-Purifying Filter: table. • These filters are attached to the inside of Temperature Air flow Model Mode the air filters. setting rate 2.

  • Page 68: Remote Controller

    SiBE06-708 Instruction Remote Controller <Open the lid> <ARC452A1> 1. Signal transmitter: 9. ECONO button: • It sends signals to the indoor unit. ECONO operation (page 16.) 10. SWING button: 2. Display: • Adjusting the Air Flow Direction (page 12.) • It displays the current settings. 11.

  • Page 69: Preparation Before Operation

    Instruction SiBE06-708 Preparation Before Operation Preparation Before Operation To set the batteries 1. Slide the front cover to take it off. Position + and – correctly! 2. Set two dry batteries (LR03·AAA). 3. Set the front cover as before. To operate the remote controller •...
  • Page 70 SiBE06-708 Instruction Preparation Before Operation To set the clock 1. Press “CLOCK button”. is displayed. blinks. 2. Press “SELECT button” to set the current day of the week. 3. Press “CLOCK button”. blinks. 4. Press “SELECT button” to set the clock to the present time. Holding down “...
  • Page 71 Instruction SiBE06-708 Turn the breaker ON • Turning ON the breaker closes the flap. (This is a normal procedure.) NOTE Tips for saving energy • Be careful not to cool (heat) the room too much. Keeping the temperature setting at a moderate level helps save energy. Recommended temperature setting •...

  • Page 72: Auto · Dry · Cool · Heat · Fan Operation

    SiBE06-708 Instruction 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.
  • Page 73 Instruction SiBE06-708 To change the air flow rate setting 5. Press “FAN setting button”. DRY mode AUTO or COOL or HEAT or FAN mode Five levels of air flow rate setting from “ ” to “ ” plus “ ” “ ”...

  • Page 74: Adjusting The Air Flow Direction

    SiBE06-708 Instruction Adjusting the Air Flow Direction Adjusting the Air Flow Direction You can adjust the air flow direction to increase your comfort. To adjust the horizontal blade (flap) 1. Press “SWING button ”. • “ ” is displayed on the LCD and the flaps will begin to swing.

  • Page 75: Air Flow Selection

    Instruction SiBE06-708 Air flow selection • Make air flow selection according to what suits you. When setting the air flow selection switch to • Air conditioner automatically decides the appropriate blowing pattern depending on the operating mode/situation. Operating mode Situation Blowing pattern •...

  • Page 76: Powerful Operation

    SiBE06-708 Instruction POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. To start POWERFUL operation 1. Press “POWERFUL button”. • POWERFUL operation ends in 20minutes. Then the system automatically operates again with the settings which were used before POWERFUL operation.

  • Page 77: Outdoor Unit Quiet Operation

    Instruction SiBE06-708 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 night. To start OUTDOOR UNIT QUIET operation 1.

  • Page 78: Econo Operation

    SiBE06-708 Instruction ECONO Operation ECONO Operation ECONO operation is a function which enables efficient operation by lowering the maximum power consumption value. To start ECONO operation 1. Press “ECONO button”. • “ ” is displayed on the LCD. To cancel ECONO operation 2.

  • Page 79: Timer Operation

    Instruction SiBE06-708 TIMER Operation 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 80 SiBE06-708 Instruction TIMER Operation To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. (page 8.) 1. Press “ON TIMER button”. is displayed. blinks. 2. Press “SELECT button” until the time setting reaches the point you like.

  • Page 81: Weekly Timer Operation

    Instruction SiBE06-708 2.10 WEEKLY TIMER Operation WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week. To use WEEKLY TIMER operation • Make sure the day of the week and time are set. If not, set the day of the week and time.
  • Page 82 SiBE06-708 Instruction WEEKLY TIMER Operation 7. Press “NEXT button”. • The time will be set. • “ ” and the temperature blink. 8. Press “SELECT button” to select the desired temperature. • The temperature can be set between 10˚C and 32˚C. •...
  • Page 83 Instruction SiBE06-708 To cancel WEEKLY TIMER operation 11.Press “WEEKLY button” to deactivate the WEEKLY operation. • The “ ” will disappear from the display. • The TIMER lamp goes off. • To reactivate the WEEKLY TIMER operation, press the “WEEKLY button” again.
  • Page 84 SiBE06-708 Instruction WEEKLY TIMER Operation Confirming a reservation • The reservation can be confirmed. 1. Press “ button”. • The day of the week and the reservation number of the current day will be displayed. 2. Press “SELECT button” to select the day of the week and the reservation number to be confirmed.
  • Page 85 Instruction SiBE06-708 Setting WEEKLY TIMER using copy mode • A reservation made once can be easily copied and the same settings used for another day of the week. 1. Press “ button”. 2. Press “SELECT button” to confirm the day of the week to be copied. 3.

  • Page 86: Care And Cleaning

    SiBE06-708 Instruction 2.11 Care and Cleaning Care and Cleaning Before cleaning, be sure to stop the operation and CAUTION turn the breaker OFF. Units Indoor unit, Outdoor unit and Remote controller 1. Wipe them with dry soft cloth. Front panel 1.

  • Page 87: Air Filter

    Instruction SiBE06-708 Filters 1. Open the front panel. (page 26.) 2. Remove the air filter. • Press the claws on the right and left of the air filter down slightly, then pull upward. 3. Take off the Titanium Apatite Photocatalytic Air-Purifying Filter. •...

  • Page 88: Before A Long Idle Period

    SiBE06-708 Instruction NOTE • Operation with dirty filters: (1) cannot deodorize the air. (2) cannot clean the air. (3) results in poor heating or cooling. (4) may cause odour. • To order Titanium Apatite Photocatalytic Air-Purifying Filter contact to the service shop there you bought the air conditioner.

  • Page 89: Troubleshooting

    Instruction SiBE06-708 2.12 Troubleshooting Trouble Shooting These cases are not troubles. The following cases are not air conditioner troubles but have some reasons. You may just continue using it. Case Explanation Operation does not start soon. • This is to protect the air conditioner. •...
  • Page 90 SiBE06-708 Instruction Check again. Please check again before calling a repair person. Case Check The air conditioner does not • Hasn’t a breaker turned OFF or a fuse blown? operate. • Isn’t it a power failure? (OPERATION lamp is off.) •...

  • Page 91: Disposal Requirements

    Instruction SiBE06-708 Call the service shop immediately. WARNING When an abnormality (such as a burning smell) occurs, stop operation and turn the breaker OFF. Continued operation in an abnormal condition may result in troubles, electric shocks or fire. Consult the service shop where you bought the air conditioner. Do not attempt to repair or modify the air conditioner by yourself.

  • Page 92: Part 6 Service Diagnosis

    SiBE06-708 Part 6 Service Diagnosis 1. Caution for Diagnosis................82 2. Problem Symptoms and Measures ............83 3. Service Check Function ................84 4. Troubleshooting ..................87 4.1 Error Codes and Description ..............87 4.2 Indoor Unit PCB Abnormality ..............88 4.3 Freeze-up Protection Control or High Pressure Control......89 4.4 Fan Motor (DC Motor) or Related Abnormality........91 4.5 Thermistor or Related Abnormality (Indoor Unit)........93 4.6 Signal Transmission Error (between Indoor and Outdoor Units)....94...

  • Page 93: Caution For Diagnosis

    Caution for Diagnosis SiBE06-708 1. Caution for Diagnosis The Operation lamp flashes 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, disabling equipment operation. 2.

  • Page 94: Problem Symptoms And Measures

    SiBE06-708 Problem Symptoms and Measures Problem Symptoms and Measures Symptom Check Item Details of Measure Reference Page None of the units operates. Check the power supply. Check to make sure that the rated voltage is — supplied. Check the type of the indoor units. Check to make sure that the indoor unit type is —...

  • Page 95: Service Check Function

    Service Check Function SiBE06-708 Service Check Function In the ARC452A series remote controller, the temperature display sections on the main unit indicate corresponding codes. Check Method 1 1. When the timer cancel button is held down for 5 seconds, a “00” indication flashes on the temperature display section.
  • Page 96 SiBE06-708 Service Check Function Check Method 2 1. Enter the diagnosis mode. Press the 3 buttons (TEMP ,TEMP , MODE) simultaneously. (R4272) The digit of the number of tens blinks. Try again from the start when the digit does not blink. (R4273) 2.
  • Page 97 Service Check Function SiBE06-708 5. Press the TEMP button. Press TEMP or TEMP and change the digit until you hear the sound of “beep”. (R4277) 6. Diagnose by the sound. “pi” : The both numbers of tens and units do not accord with the error code. “pi pi”...

  • Page 98: Troubleshooting

    SiBE06-708 Troubleshooting Troubleshooting Error Codes and Description Reference Code Indication Description Page System Normal — Insufficient gas Low-voltage detection or over-voltage detection Signal transmission error (between indoor and outdoor unit) Unspecified voltage (between indoor and outdoor unit) Indoor Indoor unit PCB abnormality Unit Freeze-up protection control or high pressure control Fan motor or related abnormality...

  • Page 99: Indoor Unit Pcb Abnormality

    Troubleshooting SiBE06-708 Indoor Unit PCB Abnormality Remote Controller Display Method of Evaluation of zero-cross detection of power supply by indoor unit. Malfunction Detection Malfunction When there is no zero-cross detection in approximately 10 continuous seconds. Decision Conditions Supposed Faulty indoor unit PCB Faulty connector connection Causes Troubleshooting...

  • Page 100: Freeze-Up Protection Control Or High Pressure Control

    SiBE06-708 Troubleshooting Freeze-up Protection Control or High Pressure Control Remote Controller Display Method of High pressure control (heat pump model only) Malfunction During heating operations, the temperature detected by the indoor heat exchanger thermistor is used for the high pressure control (stop, outdoor fan stop, etc.) Detection The freeze-up protection control (operation halt) is activated during cooling operation according to the temperature detected by the indoor unit heat exchanger thermistor.
  • Page 101 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.06 Check the air passage. Refer to P.139 Is there any Provide sufficient air passage. short-circuit? Check the intake air filter. Is it very dirty? Clean the air filter.

  • Page 102: Fan Motor (Dc Motor) Or Related Abnormality

    SiBE06-708 Troubleshooting 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 abnormal fan motor operation. Malfunction Detection Malfunction When the detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
  • Page 103 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.01 Turn off power supply Refer to P.136 and rotate fan by hand. Does fan rotate Replace fan motor. smoothly? Turn power ON and operate fan.

  • Page 104: Thermistor Or Related Abnormality (Indoor Unit)

    SiBE06-708 Troubleshooting Thermistor or Related Abnormality (Indoor Unit) Remote Controller Display Method of The temperatures detected by the thermistors are used to determine thermistor errors. Malfunction Detection Malfunction When the thermistor input is more than 4.96 V or less than 0.04 V during compressor operation∗.

  • Page 105: Signal Transmission Error (Between Indoor And Outdoor Units)

    Troubleshooting SiBE06-708 Signal Transmission Error (between Indoor and Outdoor Units) 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 When the data sent from the outdoor unit cannot be received normally, or when the content of the data is abnormal.
  • Page 106 SiBE06-708 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.10 Check the indoor unit-outdoor unit Refer to P.142 connection wires. Is there any wiring error? Correct the indoor unit-outdoor unit connection wires.

  • Page 107: Unspecified Voltage (Between Indoor And Outdoor Units)

    Troubleshooting SiBE06-708 Unspecified Voltage (between Indoor and Outdoor Units) Remote Controller Display Method of The supply power is detected for its requirements (different from pair type and multi type) by the indoor / outdoor transmission signal. Malfunction Detection Malfunction The pair type and multi type are interconnected. Decision Conditions Supposed...

  • Page 108: Outdoor Unit Pcb Abnormality

    SiBE06-708 Troubleshooting Outdoor Unit PCB Abnormality Remote Controller Display Method of Detect within the programme of the microcomputer that the programme is in normal running order. Malfunction Detection Malfunction When the programme of the microcomputer is in abnormal running order. Decision Conditions Supposed...

  • Page 109: Ol Activation (Compressor Overload)

    Troubleshooting SiBE06-708 OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection Malfunction If the compressor OL is activated twice, the system will be shut down. The error counter will reset itself if this or any other error does not occur during the following Decision 60-minute compressor running time (total time).

  • Page 110: Compressor Lock

    SiBE06-708 Troubleshooting 4.10 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the compressor running condition through the position detection circuit. Malfunction Detection Malfunction 25/35 class The system judges the compressor lock, and stops due to over current. Decision The system judges the compressor lock, and cannot operation with position detection within Conditions...

  • Page 111: Dc Fan Lock

    Troubleshooting SiBE06-708 4.11 DC Fan Lock Remote Controller Display Method of A fan motor or related error is detected by checking the high-voltage fan motor rpm being detected by the Hall IC. Malfunction Detection Malfunction The fan does not start in 30 seconds even when the fan motor is running. The system will be shut down if the error occurs 16 times.

  • Page 112: Input Over Current Detection

    SiBE06-708 Troubleshooting 4.12 Input Over Current Detection 4.12.1 25/35 Class Remote Controller Display Method of An input over-current is detected by checking the input current value with the compressor running. Malfunction Detection Malfunction The following current with the compressor running continues for 2.5 seconds. Cooling / Heating: Above 9.25A Decision Conditions...
  • Page 113 Troubleshooting SiBE06-708 4.12.2 50 Class Remote Controller Display Method of An input over-current is detected by checking the input current value being detected by CT with the compressor running. Malfunction Detection Malfunction The following CT input with the compressor running continues for 2.5 seconds. CT input : Above 20 A Decision The system will be shut down if the error occurs 16 times.
  • Page 114 SiBE06-708 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.07 ∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, Refer to P.140 take the following procedure.

  • Page 115: Four Way Valve Abnormality

    Troubleshooting SiBE06-708 4.13 Four Way Valve Abnormality 4.13.1 25/35 class Remote Controller Display Method of The indoor air temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if Malfunction they function within their normal ranges in the operating mode.
  • Page 116 SiBE06-708 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.05 Refer to P.137 Four way valve coil Correct. disconnected (loose)? Check No.06 Refer to P.139 Harness out of connector? Reconnect.
  • Page 117 Troubleshooting SiBE06-708 4.13.2 50 class Remote Controller Display Method of The room temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if Malfunction they function within their normal ranges in the operating mode. Detection Malfunction A following condition continues over 1 minute after operating 10 minutes.
  • Page 118 SiBE06-708 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.05 Refer to P.137 Four way valve coil Correct. disconnected (loose)? Check No.06 Refer to P.139 Harness out of connector? Reconnect.

  • Page 119: Discharge Pipe Temperature Control

    Troubleshooting SiBE06-708 4.14 Discharge Pipe Temperature Control Remote Controller Display Method of The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the temperature being detected by the discharge pipe thermistor. Malfunction Detection Malfunction 25/35 class If a stop takes place 4 times successively due to abnormal discharge pipe temperature, the Decision system will be shut down.
  • Page 120 SiBE06-708 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Refer to P.136 Check No. 06 Malfunctioning Replace a defective Check the thermistors. Discharge pipe thermistor thermistor.

  • Page 121: High Pressure Control In Cooling

    Troubleshooting SiBE06-708 4.15 High Pressure Control in Cooling Remote Controller Display Method of High-pressure control (stop, frequency drop, etc.) is activated in the cooling mode if the temperature being sensed by the heat exchanger thermistor exceeds the limit. Malfunction Detection Malfunction Activated when the temperature being sensed by the heat exchanger thermistor rises above 65°C.
  • Page 122 SiBE06-708 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Check the installation space. Refer to P.136 Check No.07 Abnormal Check No.06 Installation condition Change the air outlet grille check position.

  • Page 123: Compressor System Sensor Abnormality

    Troubleshooting SiBE06-708 4.16 Compressor System Sensor Abnormality 4.16.1 25/35 Class Remote Controller Display Method of The system checks the DC current before the compressor starts. Malfunction Detection Malfunction If the DC current before compressor start-up is out of the range 0.5-4.5 V (sensor output converted to voltage value) or if the DC voltage before compressor start-up is below 50 V.
  • Page 124 SiBE06-708 Troubleshooting 4.16.2 50 Class Remote Controller Display Method of Fault condition is identified by the supply voltage and the DC voltage which is detected before the compressor startup. Malfunction Fault condition is identified by compressor current which is detected right after the Detection compressor startup.
  • Page 125 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn off the power Reactor connection check Connection OK? Connect properly. Compressor connection check Connection OK? Connect properly. Disconnect the reactor from the outdoor unit PCB and measure the resistance Reactor check...

  • Page 126: Position Sensor Abnormality

    SiBE06-708 Troubleshooting 4.17 Position Sensor Abnormality Remote Controller Display Method of A compressor startup failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Detection Malfunction The compressor fails to start in about 15 seconds after the compressor run command signal is sent.

  • Page 127: Dc Voltage / Current Sensor Abnormality

    Troubleshooting SiBE06-708 4.18 DC Voltage / Current Sensor Abnormality Remote Controller Display Method of Detecting abnormality of the DC sensor by the running frequency of compressor and by the input current multiplied DC voltage and current. Malfunction Detection Malfunction The compressor running frequency is below 52 Hz. (The input current is also below 0.1 A.) Decision If this error repeats 4 times, the system will be shut down.

  • Page 128: Ct Or Related Abnormality

    SiBE06-708 Troubleshooting 4.19 CT or Related Abnormality Remote Controller Display Method of A CT or related error is detected by checking the compressor running frequency and CT- detected input current. Malfunction Detection Malfunction The compressor running frequency is below 55 Hz and the CT input is below 0.1 V. (The input current is also below 0.5 A.) Decision If this error repeats 4 times, the system will be shut down.
  • Page 129 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.12 Turn off the power and turn it on Refer to P.143 again. Get the system started. ∗...

  • Page 130: Thermistor Or Related Abnormality (Outdoor Unit)

    SiBE06-708 Troubleshooting 4.20 Thermistor or Related Abnormality (Outdoor Unit) P4, J3, J6, H9 Remote Controller Display Method of This type of error is detected by checking the thermistor input voltage to the microcomputer. [A thermistor error is detected by checking the temperature.] Malfunction Detection Malfunction...
  • Page 131 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.06 Turn on the power again. Refer to P.139 Error displayed again Reconnect. on remote controller? Connector or thermistor Reconnect.

  • Page 132: Electrical Box Temperature Rise

    SiBE06-708 Troubleshooting 4.21 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Malfunction Detection Malfunction With the compressor off, the radiation fin temperature is above 80°C (95°C ). (Reset is made when the temperature drops below 70°C (80°C ).) Decision : value for 50 class...
  • Page 133 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. WARNING Check No.06 Turn off the power and turn it on again. To cool down the electricals, the Refer to P.139 outdoor unit fan gets started when the radiation fin temperature rises...

  • Page 134: Radiation Fin Temperature Rise

    SiBE06-708 Troubleshooting 4.22 Radiation Fin Temperature Rise 4.22.1 25/35 Class Remote Controller Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on. Malfunction Detection Malfunction If the radiation fin temperature with the compressor on is above 90°C. Clearing condition : when the temperature drops below 85°C.
  • Page 135 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.06 Turn off the power and turn it on Refer to P.139 again to get the system started. Check No.07 Refer to P.140 Error displayed again?
  • Page 136 SiBE06-708 Troubleshooting 4.22.2 50 Class Remote Controller Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on. Malfunction Detection Malfunction If the radiation fin temperature with the compressor on is above 105°C, The error is cleared when the temperature drops below 99°C.
  • Page 137 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.06 Turn off the power and turn it on Refer to P.139 again to get the system started. Check No.07 Refer to P.140 Error displayed again?

  • Page 138: Output Over Current Detection

    SiBE06-708 Troubleshooting 4.23 Output Over Current Detection Remote Controller Display Method of An output over-current 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. A speed error occurs while the compressor is running.
  • Page 139 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. ∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and Check No.07 reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.

  • Page 140: Insufficient Gas

    SiBE06-708 Troubleshooting 4.24 Insufficient Gas 4.24.1 25/35 Class Remote Controller Display Method of Gas shortage detection I: Gas shortage is detected by checking the input current value and the compressor running Malfunction frequency. If the gas is short, the input current is smaller than the normal value. Detection Gas shortage detection II: Gas shortage is detected by checking the discharge temperature and the opening of the...
  • Page 141 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Refer to P.136 Any thermistor Reconnect in position. disconnected? * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor Check No.06 * Room temperature thermistor * Outdoor air thermistor...
  • Page 142 SiBE06-708 Troubleshooting 4.24.2 50 Class Remote Controller Display Method of Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current value and the Malfunction compressor running frequency. Detection Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger temperature and room temperature.
  • Page 143 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Refer to P.136 Any thermistor Reconnect in position. disconnected? * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor Check No.06 * Outdoor air thermistor...

  • Page 144: Low-Voltage Detection Or Over-Voltage Detection

    SiBE06-708 Troubleshooting 4.25 Low-voltage Detection Over-voltage Detection Remote Controller Display Method of An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage detection circuit. Malfunction Detection Malfunction 25/35 class An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer Decision (The voltage is over 400V).
  • Page 145 Troubleshooting SiBE06-708 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the supply voltage. Supply voltage as Correct the power supply. specified? Rotate fan by hand. Does fan rotate Replace fan motor and smoothly? outdoor unit PCB .

  • Page 146: Signal Transmission Error On Outdoor Unit Pcb

    SiBE06-708 Troubleshooting 4.26 Signal Transmission Error on Outdoor Unit PCB Remote Controller Display Method of Communication error between microcomputer mounted on the main microcomputer and PM1. Malfunction Detection Malfunction When the data sent from the PM1 can not be received successively for 9 sec. Decision The abnormality is determined if the above fault conditions occurs once.

  • Page 147: Check

    Check SiBE06-708 5. Check How to Check 5.1.1 Fan Motor Connector Output Check Check No.01 1. Check connector connection. 2. Check motor power supply voltage output (pins 4-7). 3. Check motor control voltage (pins 4-3). 4. Check rotation command voltage output (pins 4-2). 5.

  • Page 148: Sibe06

    SiBE06-708 Check 5.1.3 Four Way Valve Performance Check Check No.05 25/35 class Turn off the power and turn it on again. ∗ Four way valve coil Cooling / dry : No continuity Start the heating-mode run. Heating : Continuity S80 voltage at DC 220-240 V with Replace the outdoor unit compressor on?
  • Page 149 Check SiBE06-708 50 class Turn off the power and turn it on again. ∗ Four way valve coil Cooling / dry : No continuity Start the heating-mode run. Heating : Continuity S80 voltage at DC 220-240 V with Replace the outdoor unit compressor on? PCB.

  • Page 150: Thermistor Resistance Check

    SiBE06-708 Check 5.1.4 Thermistor Resistance Check Check No.06 Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the graph and the table below.

  • Page 151: Installation Condition Check

    Check SiBE06-708 5.1.5 Installation Condition Check Check No.07 Installation condition check Check the allowable Abnormal Change the position of the air dimensions of the air suction discharge grille or the and discharge area. installation location. Normal Does the discharged air from other outdoor Change the position of the air unit cause an increase of discharge grille or the...

  • Page 152: Discharge Pressure Check

    SiBE06-708 Check 5.1.6 Discharge Pressure Check Check No.08 Discharge pressure check High Replace compessor. Open the stop valve. Is the stop valve open? Is the Replace the pipe installed at connection pipe deformed? the site. At the heat exchanger and Clean.

  • Page 153: Power Supply Waveforms Check

    Check SiBE06-708 5.1.8 Power Supply Waveforms Check Check No.10 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check the waveform disturbance. Check to see if the power supply waveform is a sine wave (Fig.1). Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2) [Fig.1] [Fig.2]...

  • Page 154: Capacitor Voltage Check

    SiBE06-708 Check 5.1.10 Capacitor Voltage Check Check No.12 Before this checking, be sure to check the main circuit for short-circuit. Checking the capacitor voltage With the circuit breaker still on, measure the voltage according to the drawing of the model in question.
  • Page 155 Check SiBE06-708 50 class Checking the power transistor Never touch any live parts for at least 10 minutes after turning off the circuit breaker. If unavoidably necessary to touch a live part, make sure the power transistor's supply voltage is below 50 V using the tester. For the UVW, make measurements at the Faston terminal on the board or the relay connector.

  • Page 156: Main Circuit Electrolytic Capacitor Check

    SiBE06-708 Check 5.1.12 Main Circuit Electrolytic Capacitor Check Check No.14 Checking the main circuit electrolytic capacitor Never touch any live parts for at least 10 minutes after turning off the circuit breaker. If unavoidably necessary to touch a live part, make sure there is no DC voltage using the tester.
  • Page 157 Check SiBE06-708 Service Diagnosis...

  • Page 158: Part 7 Removal Procedure

    SiBE06-708 Part 7 Removal Procedure 1. Indoor Unit...................148 1.1 Removal of the Air Filter / Front Panel ..........148 1.2 Removal of the Horizontal Blade............152 1.3 Removal of the Electrical Box ..............153 1.4 Removal of the PCB................155 1.5 Removal of the Vertical Blade ..............159 1.6 Removal of the Heat Exchanger ............162 1.7 Removal of the Fan Rotor / Fan Motor..........163 2.

  • Page 159: Indoor Unit

    Indoor Unit SiBE06-708 1. Indoor Unit Removal of the Air Filter / Front Panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Appearance This is an appearance of the product.
  • Page 160 SiBE06-708 Indoor Unit Step Procedure Points Open the front panel. Hook Preventing drop of the front panel (R6769) Press the 2 right and left hooks at the top of the air filter downward, bend the filter to remove. Pull the air filter up and remove it.
  • Page 161 Indoor Unit SiBE06-708 Step Procedure Points Undo 3 hooks from the bottom of the front panel and remove the front panel. When installing the air filter, catch the 3 hooks Hooks at the bottom of the air filter at the bottom of the front panel and hitch the string to prevent the front panel from...
  • Page 162 SiBE06-708 Indoor Unit Step Procedure Points Pull the front grill to 3 hooks are provided at the your side to remove. top of the main unit, but pull the front grille to your side to remove. (R6775) Slide the indicator to the left side and undo the hooks to remove.

  • Page 163: Removal Of The Horizontal Blade

    Indoor Unit SiBE06-708 Removal of the Horizontal Blade Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Open the horizontal blade. Undo the hook from the central supporting plate.

  • Page 164: Removal Of The Electrical Box

    SiBE06-708 Indoor Unit Removal of the Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the grounding screws. Sensor fixing plate Open the sensor fixing plate.
  • Page 165 Indoor Unit SiBE06-708 Step Procedure Points Disconnect 3 connectors. S42: To M1S S41: To M2S S1: To fan motor (R6784) Remove the fixing screw. Pull the electrical box to your side and remove. Pull the heat exchanger thermistor out. Heat exchanger thermistor (R6787) Removal Procedure...

  • Page 166: Removal Of The Pcb

    SiBE06-708 Indoor Unit Removal of the PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the shelter. Hooks Undo the 8 hooks from the side flame-proof plate to remove the Side shelter plate.
  • Page 167 Indoor Unit SiBE06-708 Step Procedure Points 3. Removing the service Undo the left hook first. PCB. Undo the 2 hooks. Hook (R6790) Undo the 2 hooks. Hooks (R6792) Disconnect the connector and remove the service PCB. (R6793) (R6795) Removal Procedure...
  • Page 168 SiBE06-708 Indoor Unit Step Procedure Points 4. Removing the display PCB. Undo the 2 hooks. Hooks (R6796) Disconnect the connector and remove the display PCB. Display PCB (R6797) 5. Removing the control PCB. Cut the cable lock belt and pull the all Faston Cable lock Faston terminals out from the...
  • Page 169 Indoor Unit SiBE06-708 Step Procedure Points Remove the 2 screws. Screw Screw (R6800) Remove the control PCB. Varistor Fuse 250V 3.15A Detail of the Control PCB (R6802) Removal Procedure...

  • Page 170: Removal Of The Vertical Blade

    SiBE06-708 Indoor Unit Removal of the Vertical Blade Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the vertical blade (upper). Screw Screw Remove the 2 screws from the upper discharge grille.
  • Page 171 Indoor Unit SiBE06-708 Step Procedure Points Remove the 2 screws and remove the swing motor. Shaft (R6808) 2. Removing the vertical Be careful not to blade (lower). contaminate the floor with the drain. Remove the right and left screws. Remove the drain hose and unhook the swing motor harness.
  • Page 172 SiBE06-708 Indoor Unit Step Procedure Points Pull the lower part of the vertical blade to your side to remove. Remove the 2 screws from the swing motor. Remove the damper. Remove the seal material from the front of the flap, undo the hooks, unhook the drain pan and remove the vertical blade.

  • Page 173: Removal Of The Heat Exchanger

    Indoor Unit SiBE06-708 Removal of the Heat Exchanger Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Make sure that the gases are removed after the pump down work. After that, start the removal of the heat exchanger.

  • Page 174: Removal Of The Fan Rotor / Fan Motor

    SiBE06-708 Indoor Unit Removal of the Fan Rotor / Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the fan rotor. Remove the 4 screws from the bellmouth.
  • Page 175 Indoor Unit SiBE06-708 Step Procedure Points Pick the hooks with your fingers to remove the harness retainer. Harness retainer Hooks (R6824) 3. Removing the housing. Press the 2 hooks toward the back side and remove Remove 3 screws from Hooks the housing.

  • Page 176: Outdoor Unit : 50 Class

    SiBE06-708 Outdoor Unit : 50 Class 2. Outdoor Unit : 50 Class Removal of the Panels and Plates Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1.
  • Page 177 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step The front grille has 4 hooks. Slide the discharge grille upwards and remove it. Loosen the 6 screws of front panel. Push the front panel and undo the hooks. Lift the clamp plate remove it.
  • Page 178 SiBE06-708 Outdoor Unit : 50 Class Procedure Points Step Undo the left side Lift the front panel and hooks, and then the remove it while pushing the right side hook. right side panel inwards. Remove the front panel. Lift the front panel and undo the right side hook.
  • Page 179 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step 2. Remove the stop valve cover. Loosen the screw of the stop valve cover. Pull down the stop valve cover to undo the hooks and remove it. The stop valve cover has 6 hooks.

  • Page 180: Removal Of The Fan Motor / Propeller Fan

    SiBE06-708 Outdoor Unit : 50 Class Removal of the Fan Motor / Propeller Fan Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the top panel and the front panel.
  • Page 181 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step 2. Remove the fan motor. Disconnect the connector for fan motor (S70). The illustration shows arrangement of the fan motor lead wire. Removal Procedure...
  • Page 182 SiBE06-708 Outdoor Unit : 50 Class Procedure Points Step Unscrew the washer- fitted nut (M10) of the propeller fan with a spanner. Align mark of the propeller fan with D-cut section of the motor shaft when reassembling. Remove the 4 screws from the motor.
  • Page 183 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step Pull the fan motor out. Put the lead wire through the back of the motor when reassembling (so as not to be entangled with the propeller fan). (R5265) Removal Procedure...

  • Page 184: Removal Of The Electrical Box

    SiBE06-708 Outdoor Unit : 50 Class Removal of the Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the top panel and the front panel. 1.
  • Page 185 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step Disconnect the 2 earth wires. Loosen the 3 screws of right side panel. Loosen the fixing screw of the electrical box. Removal Procedure...
  • Page 186 SiBE06-708 Outdoor Unit : 50 Class Procedure Points Step Insert the 2 hooks of the lower part and the 1 hook of the upper back when Hook reassembling. (R5272) Hooks (R5273) Disconnect the connectors of the front side. S20: electronic expansion valve S40: overload protector S80: four way valve...
  • Page 187 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step Release the clamp and undo the wire from the hook. Lift the electrical box and remove it. Removal Procedure...

  • Page 188: Removal Of The Pcb

    SiBE06-708 Outdoor Unit : 50 Class Removal of the PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the electrical box. 1. Remove the PCB. Disconnect the connectors for the control PCB (S52,...
  • Page 189 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step Undo the hook on the right. Open the cable way board. Disconnect the 1: Black harnesses. 2: White 3: Red L1: Black L2: Brown N1: White N2: Blue Disconnect the 2 harnesses for the reactor (HR1, HR2).
  • Page 190 SiBE06-708 Outdoor Unit : 50 Class Procedure Points Step Loosen the 3 fixing screws for the main PCB. Undo the 4 hooks. Lift up and remove the PCB. Removal Procedure...

  • Page 191: Removal Of The Sound Blanket

    Outdoor Unit : 50 Class SiBE06-708 Removal of the Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the sound blanket (back). Remove the sound Since the piping ports on the blanket...
  • Page 192 SiBE06-708 Outdoor Unit : 50 Class Procedure Points Step Remove the sound blanket (top-lower). Remove the sound Since the piping ports on the blanket (inner). sound blanket (inner) are torn easily, remove the blanket carefully. Release the discharge Pay attention to the direction pipe thermistor.

  • Page 193: Removal Of The Four Way Valve

    Outdoor Unit : 50 Class SiBE06-708 Removal of the Four Way Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the electronic The illustration is for heat expansion valve coil.
  • Page 194 SiBE06-708 Outdoor Unit : 50 Class Procedure Points Step Heat up every brazed In case of the difficulty with part in turn and gas brazing machine disconnect. 1. Disconnect the brazed part where is easy to disconnect and restore. 2. Cut pipes on the main unit by a miniature copper tube cutter in order to make it easy to disconnect.

  • Page 195: Removal Of The Compressor

    Outdoor Unit : 50 Class SiBE06-708 Removal of the Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the terminal cover. Disconnect the lead Be careful so as not to burn wires of the the compressor terminals or compressor.
  • Page 196 SiBE06-708 Outdoor Unit : 50 Class Procedure Points Step Release the clamp by pliers to detach the wire harness for the compressor. Remove the putty. The illustration is for heat pump models as representative. Before working, make sure that the refrigerant is empty in the circuit.
  • Page 197 Outdoor Unit : 50 Class SiBE06-708 Procedure Points Step Unscrew the nut of the compressor. Before working, Warning make sure that the Ventilate when refrigerant refrigerant is empty leaks during the work. in the circuit. (If refrigerant contacts fire, it Be sure to apply will cause to arise toxic gas.) nitrogen...

  • Page 198: Part 8 Others

    SiBE06-708 Part 8 Others 1. Others ....................188 1.1 Test Run from the Remote Controller ..........188 1.2 Jumper Settings ...................189 Others...

  • Page 199: Others

    Others SiBE06-708 1. Others Test Run from the Remote Controller For Heat pump In cooling mode, select the lowest programmable temperature; in heating mode, select the highest programmable temperature. Trial operation may be disabled in either mode depending on the room temperature. After trial operation is complete, set the temperature to a normal level.

  • Page 200: Jumper Settings

    SiBE06-708 Others Jumper Settings 1.2.1 When Two Units are Installed in One Room When two indoor units are installed in one room, the two wireless remote controllers can be set for different addresses. How to set the different addresses 1) Remove the front grille. 2) Live the sensor securing plate and remove the front metal plate cover.
  • Page 201 Others SiBE06-708 Others...

  • Page 202: Part 9 Appendix

    SiBE06-708 Part 9 Appendix 1. Piping Diagrams..................192 1.1 Indoor Units ..................192 1.2 Outdoor Units ..................193 2. Wiring Diagrams..................195 2.1 Indoor Units ..................195 2.2 Outdoor Units ..................196 Appendix...

  • Page 203: Piping Diagrams

    Piping Diagrams SiBE06-708 Piping Diagrams Indoor Units FVXS25FV1B, FVXS35FV1B FVXS50FV1B INDOOR UNIT INDOOR UNIT MUFFLER ASSY HEAT EXCHANGER MUFFLER ASSY HEAT EXCHANGER 6.4CuT 7.0CuT 7.0CuT 6.4CuT 6.4CuT 6.4CuT 6.4CuT THERMISTOR THERMISTOR ON HEAT EXCH. ON HEAT EXCH. 6.4CuT 6.4CuT FIELD PIPING...

  • Page 204: Outdoor Units

    SiBE06-708 Piping Diagrams Outdoor Units RKS25F2V1B, RKS35F2V1B OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER 7.0CuT THERMISTOR 7.0CuT 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 NORMALLY : OFF...
  • Page 205 Piping Diagrams SiBE06-708 RXS25F2V1B, RXS35F2V1B OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER 7.0CuT THERMISTOR 7.0CuT 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 )

  • Page 206: Wiring Diagrams

    SiBE06-708 Wiring Diagrams Wiring Diagrams Indoor Units FVXS25FV1B, FVXS35FV1B, FVXS50FV1B PCB2 PCB3 → RECTIFIER S2W(4) 3.15A outdoor GRN/YLW FIELD WIRING. WIRELESS TRANSMISSION REMOTE CAUTION CIRCUIT CONTROLLER NOTE THAT OPERATION WILL PCB4 RESTART AUTOMATICALLY IF SIGNAL THE MAIN POWER SUPPLY IS...

  • Page 207: Outdoor Units

    Wiring Diagrams SiBE06-708 Outdoor Units RKS25F2V1B, RKS35F2V1B, RXS25F2V1B, RXS35F2V1B R12T t ° C100 FIELD WIRING. indoor PCB1 MRM20 IPM1 MRM10 3.15A IC11 3.15A PCB2 MRCW outdoor NOTE 1. REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. t ° t ° t °...
  • Page 208 SiBE06-708 Wiring Diagrams RXS50F2V1B X12A MRM20 3.15A POWER SUPPLY MRM10 6(P) + + + 7(N) X11A TO INDOOR UNIT 3.15A PCB1 SHEET METAL 1 S51 S101 indoor FIELD WIRING t° t° t° S102 PCB2 (OUTDOOR)(DISCHARGE) LED A (CONDENSER) outdoor Z1C~Z5C : FERRITE CORE X1M, X2M : TERMINAL STRIP...
  • Page 209 Wiring Diagrams SiBE06-708 Appendix...

  • Page 210: Index

    SiBE06-708 Index Numerics control PCB ............13 control PCB (outdoor unit)........15 00 ................87 CT or related abnormality........117 3 minutes stand-by..........30, 38 DC fan lock............100 A1................88 DC voltage / current sensor abnormality ....116 A5................89 defrost control ............41 A6................91 diagnosis mode ............
  • Page 211 SiBE06-708 U2 ..............133 input current control ..........39 U4 ..............94 input over current detection........101 U7 ..............135 installation condition check ........140 UA..............96 instruction ............... 53 error codes and description........87 insufficient gas ............. 129 insufficient gas control..........46 inverter POWERFUL operation ......28 F3 ................108 inverter principle .............
  • Page 212 SiBE06-708 power transistor check ..........143 stop valve cover ........... 168 POWERFUL operation........28, 48 SW1 ..............12, 16 preheating operation ..........35 SW2 ............... 12 pressure equalization control ........44 SW4 ............... 12 printed circuit board (PCB) switch B ..............49 control PCB ............13 control PCB (outdoor unit) ........15 display PCB ............13 terminal cover............
  • Page 213 SiBE06-708 Index...

  • Page 214: Drawings & Flow Charts

    ......... 133 electrical box temperature rise ......121 electronic expansion valve check ......136 electronic expansion valve control ......43 piping diagrams FVXS25FV1B ..........192 FVXS35FV1B ..........192 facility setting switch ..........49 FVXS50FV1B ..........192 fan motor (DC motor) or related abnormality ..91 RKS25F2V1B ..........
  • Page 215 LED indication ....82 turning speed pulse input on the outdoor unit PCB check ............145 unspecified voltage (between indoor and outdoor units) ..........96 wide-angle louvres ..........22 wiring diagrams FVXS25FV1B ..........195 FVXS35FV1B ..........195 FVXS50FV1B ..........195 RKS25F2V1B ..........196 RKS35F2V1B ..........196 RKS50F2V1B ..........196 RXS25F2V1B ..........196 RXS35F2V1B ..........196...
  • Page 216 Specifications, designs and other content appearing in this brochure are current as of March 2007 but subject to change without notice. SiBE 06-708 Printed in Japan 03/2007 B AK...

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