Daikin CTXU25G2V1B Service Manual
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Daikin CTXU25G2V1B Service Manual

Inverter multi system with humidifying g-series
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See also: Service Manual , Operating Manual
SiBE12-908
Preliminary
Inverter Multi System
with Humidifying
G-Series
[Applied Models]
Inverter Multi : Heat Pump
Specifications, designs and other content appearing in this brochure are current as of January 2009 but subject to change without notice.
SiBE12-908
Printed in Japan 01/2009 B AK

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Summary of Contents for Daikin CTXU25G2V1B

  • Page 1 SiBE12-908 Preliminary Inverter Multi System with Humidifying G-Series [Applied Models] Inverter Multi : Heat Pump Specifications, designs and other content appearing in this brochure are current as of January 2009 but subject to change without notice. SiBE12-908 Printed in Japan 01/2009 B AK...
  • Page 2 SiBE12-908 Inverter Multi System with Humidifying G-Series Heat Pump Indoor Unit CTXU25G2V1B CTXU35G2V1B CTXU42G2V1B CTXU50G2V1B Outdoor Unit 2MXU40GV1B 2MXU50GV1B Table of Contents...
  • Page 3 SiBE12-908 Table of Contents...

  • Page 4: Table Of Contents

    SiBE12-908 Part 4 Function and Control 1. Main Functions..................2 1.1 Frequency Principle..................2 1.2 Thermostat Control...................4 1.3 Automatic Operation.................5 1.4 Programme Dry Function .................6 1.5 Airflow Direction Control................7 1.6 Fan Speed Control for Indoor Units............8 1.7 HUMID HEAT Operation ................9 1.8 Fresh Air Supply Ventilation ..............14 1.9 2-AREA INTELLIGENT EYE ..............16 1.10 Inverter POWERFUL Operation .............18 1.11 ECONO Mode ..................19...

  • Page 5: Main Functions

    Main Functions SiBE12-908 1. Main Functions 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 Additional The target frequency is adapted by additional parameters in the following cases:...
  • Page 6 SiBE12-908 Main Functions Inverter Features The inverter provides the following features: The regulating capacity can be changed according to the changes in the outdoor air temperature and cooling / heating load. Quick heating and quick cooling The compressor rotational speed is increased when starting the heating (or cooling). This enables a quick set temperature.

  • Page 7: Thermostat Control

    Main Functions SiBE12-908 Thermostat Control Thermostat control is based on the difference between the room temperature and the set point. 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 8: Automatic Operation

    SiBE12-908 Main Functions Automatic Operation Automatic Cooling / Heating Function 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 9: Programme Dry Function

    Main Functions SiBE12-908 Programme Dry Function Programme dry function removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow 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 10: Airflow Direction Control

    SiBE12-908 Main Functions Airflow Direction Control Power-Airflow The large flaps send a large volume of air downwards to the floor. The flap provides an optimum control area in cooling, heating, and dry mode. Dual Flaps Heating Mode During heating mode, the large flap enables direct warm air straight downwards. The flap presses the warm air above the floor to reach the entire room.

  • Page 11: Fan Speed Control For Indoor Units

    Main Functions SiBE12-908 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 116.

  • Page 12: Humid Heat Operation

    SiBE12-908 Main Functions HUMID HEAT Operation Operation 1. Select HEAT mode. 2. Set humidity. (R9409) ∗ Refer to the operation manual for details. Features A world first new humidifying method has adopted What is new in this method is to intake vapor in the outdoor air with the hygroscopic element mounted in outdoor unit, and send indoors.
  • Page 13 Main Functions SiBE12-908 • HUMID HEAT operation by URURU This air conditioner enables uniformly humidifying the room by circulating vapor with warm air. The room is uniformly humidified. (R3326) Powerful humidifying ability The humidifying capacity is 450 ml/h and equivalent to that of a normal humidifier. The value is measured at 7°C DB / 6°C WB of outdoor air and with 4.0 m of humidifying hose length.
  • Page 14 SiBE12-908 Main Functions How to Check the You can check whether the humidifying unit is in good working order. If you set HUMID HEAT test operation (refer to the installation manual for details), you can check even beyond the range Motion of of the conditions for humidifying operation.
  • Page 15 Main Functions SiBE12-908 Time chart for Approx. 1min. after HUMID HEAT operation start up, it repeats humidifying and drying alternately (to protect condensation for inside the hose). humidifying operation control HUMID HEAT Approx. 1min operation Approx. 3min Humidifying fan and damper Hygroscopic 15 sec.
  • Page 16 SiBE12-908 Main Functions Humidification The humidifying of this system is different from that of the normal humidifier. Therefore, the humidifying performance varies with the outdoor temperature or installation condition. performance by Sufficient humidifying capacity may not be attained depending on the weather condition in outdoor operation.

  • Page 17: Fresh Air Supply Ventilation

    Main Functions SiBE12-908 FRESH AIR SUPPLY VENTILATION Operation FRESH AIR SUPPLY VENTILATION (R9425) ∗ Refer to the operation manual for details. Features The air supply ventilation system using only fresh air. Any contaminated outdoor air is purified in two stages of indoor unit and outdoor unit. Fresh air from which bacteria were removed is supplied into the room.
  • Page 18 SiBE12-908 Main Functions Ventilation System The ventilation type is mainly divided into two. The convenient system is supply ventilation. Supply Ventilation Exhaust Ventilation Fresh Air Supply Draft (R5979) - Quiet because the ventilation fan is located in - Operation noise is heard because the ventilation the outdoor unit fan is located in the room.

  • Page 19: 2-Area Intelligent Eye

    Main Functions SiBE12-908 2-AREA INTELLIGENT EYE The following functions can be performed by a human motion sensor (INTELLIGENT EYE). 1. Reduces the capacity when there is no human in the room in order to save electricity. (energy saving operation) 2. Divides the room into plural areas and detects existence of humans in each area. Shifts the airflow direction to the area having no human automatically to avoid direct airflow on humans.
  • Page 20 SiBE12-908 Main Functions 2. The motions in energy saving operation (for example: in cooling) within 20 minutes. 20 min. 20 min. Human detection signal RESET. (From area A or B) Cooling : Set temp. + 2˚C Heating : Set temp. - 2˚C Set temp.

  • Page 21: Inverter Powerful Operation

    Main Functions SiBE12-908 1.10 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 20 minutes.

  • Page 22: Econo Mode

    SiBE12-908 Main Functions 1.11 ECONO Mode Outline The "ECONO mode" reduces the maximum operating current and power consumption by approx. 30% during start up etc.. This mode 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 23: Night Set Mode

    Main Functions SiBE12-908 1.12 NIGHT SET Mode When the OFF timer is set, the NIGHT SET circuit automatically activates. The NIGHT SET circuit maintains the airflow setting made by users. The NIGHT SET The NIGHT SET circuit 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 24: Other Functions

    SiBE12-908 Main Functions 1.13 Other Functions 1.13.1 Multi-Colored Indicator Lamp Features Current operation mode is displayed in color of the lamp of the indoor unit which changes in 6 colors. Operating status can be monitored even in automatic operation in accordance with the content of actual operation.
  • Page 25 Main Functions SiBE12-908 Push this button once to start operation. Push once again to stop it. This button is useful when the remote controller is missing. The operation mode refers to the following table. Mode Temperature setting Airflow rate ° Heat Pump AUTO AUTO...

  • Page 26: Table For Special Modes

    SiBE12-908 Main Functions 1.14 Table for Special Modes Indoor [ON/OFF] 5~9 sec. • Indoor [ON/OFF] Forced operation mode • Left for 15 min. [CANCEL] 5 sec. • [CANCEL] 5 sec. Easy diagnosis mode • Left for 60 sec. Mode selection view: Select with TEMP button.
  • Page 27 Main Functions SiBE12-908 2. Trial operation mode: You can select a mode for trial operation on the remote controller. The operation continues for approx. 30 minutes. Refer to the installation manual on page 57 for detail. 3. Pipe set mode: You can set the humidifying hose length and then check the preset value.

  • Page 28: Function Of Thermistor

    SiBE12-908 Function of Thermistor Function of Thermistor Heat Pump Model Expansion valve Four way valve (R7042) Compressor A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. The system sets a target discharge temperature according to the outdoor and indoor heat Exchanger exchanger temperature, and controls the electronic expansion valve opening so that the Thermistor...
  • Page 29 Function of Thermistor SiBE12-908 Indoor Heat 1. The indoor heat exchanger thermistors are used for controlling target discharge temperature. The system sets a target discharge pipe temperature according to the outdoor and indoor Exchanger heat exchanger temperature, and controls the electronic expansion valve opening so that Thermistor the target discharge temperature can be obtained.

  • Page 30: Control Specification

    SiBE12-908 Control Specification 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 31: Automatic Switching For Humid Heat Operation Room

    Control Specification SiBE12-908 Automatic switching for HUMID HEAT operation room Outline When the indoor units in both 2 rooms are set to HUMID HEAT operation, priority will be given to the indoor unit starting operation first basically. However, priority will be given to the indoor unit starting operation subsequently under certain conditions.

  • Page 32: Frequency Control

    SiBE12-908 Control Specification Frequency Control Outline Frequency that corresponds to each room’s capacity will be determined according to the difference in the temperature of each room and the temperature that is set by the remote controller. The function is explained as follows. 1.
  • Page 33 Control Specification SiBE12-908 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...

  • Page 34: Controls At Mode Changing / Start-Up

    SiBE12-908 Control Specification Controls at Mode Changing / Start-up 3.4.1 Preheating Operation Outline Operate the inverter in the open phase operation with the conditions including the preheating command from the indoor, the outdoor air temperature and discharge pipe temperature. Detail Preheating ON Condition When outdoor air temperature is below 10.5ºC and discharge pipe temperature is below 10.5ºC, inverter in open phase operation starts.
  • Page 35 Control Specification SiBE12-908 3.4.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency must be set as follows. (The function must not be used when defrosting.) 40 class 50 class FCG 1 FCG 2 FCG 3 TCG 1 TCG 2...

  • Page 36: Discharge Pipe Temperature Control

    SiBE12-908 Control Specification Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the compressor's internal temperature. If the discharge pipe temperature rises above a certain level, the operating frequency upper limit is set to keep this temperature from going up further. Detail Divide the Zone Keep...

  • Page 37: Freeze-Up Protection Control

    Control Specification SiBE12-908 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 38: Fan Control

    SiBE12-908 Control Specification Fan Control Outline Fan control is carried out according to the following conditions. 1. Fan ON control for electric component cooling fan 2. Fan control when defrosting 3. Fan OFF delay when stopped 4. ON/OFF control when cooling operation 5.

  • Page 39: Defrost Control

    Control Specification SiBE12-908 3.11 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 its fixed value when finishing. Detail Conditions for Starting Defrost The starting conditions must be made with the outdoor air temperature and heat exchanger temperature.

  • Page 40: Electronic Expansion Valve Control

    SiBE12-908 Control Specification 3.12 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 Room Distribution Control 1.
  • Page 41 Control Specification SiBE12-908 Detail The followings are the examples of control which function in each mode by the electronic expansion valve control. Operation pattern : function × : not function When power is turned ON × × × × × ×...
  • Page 42 SiBE12-908 Control Specification 3.12.1 Fully Closing with Power On Initialize the electronic expansion valve when turning on the power, set the opening position and develop pressure equalizing. 3.12.2 Pressure Equalization Control When the compressor is stopped, open and close the electronic expansion valve and develop pressure equalization.
  • Page 43 Control Specification SiBE12-908 Detail Detect Disconnection If a 780-second timer for open control becomes over, the following adjustment must be made. 1. When the operation mode is cooling When the discharge pipe temperature is lower than the outdoor heat exchanger temperature, the discharge pipe thermistor disconnection must be ascertained.

  • Page 44: Malfunctions

    SiBE12-908 Control Specification 3.13 Malfunctions 3.13.1 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. Gas pipe thermistor 5.

  • Page 45: Forced Operation Mode

    Control Specification SiBE12-908 Detail Judgment by Input Current When an output frequency is exceeds 51 Hz (40 class) or 48 Hz (50 class) and the input current is less than specified value, the adjustment is made for insufficient gas. Judgment by Discharge Pipe Temperature When discharge pipe temperature is higher than 101°C, the electronic expansion value opening is 450 plus (max.) and the adjustment is made for insufficient gas.

  • Page 46: Additional Function

    SiBE12-908 Control Specification 3.15 Additional Function 3.15.1 POWERFUL Operation Mode Compressor operating frequency and outdoor unit airflow rate are increased. 3.15.2 Voltage Detection Function Power supply voltage is detected each time equipment operation starts. Function and Control...
  • Page 47 Control Specification SiBE12-908 Function and Control...
  • Page 48 SiBE12-908 Part 5 Installation / Operation Manual 1. Installation Manual ................46 1.1 Indoor Units ....................46 1.2 Outdoor Units ..................58 2. System Configuration................70 3. Operation Manual..................71 3.1 Names of Parts..................71 3.2 AUTO · DRY · COOL · HEAT · FAN Operation ........73 3.3 Adjusting the Airflow Direction..............75 3.4 HUMID HEAT Operation ................77 3.5 FRESH AIR SUPPLY VENTILATION ............79...

  • Page 49: Installation Manual

    Installation Manual SiBE12-908 1. Installation Manual Indoor Units Indoor Unit Installation Drawings Ho w to attach the indoor unit. A Mounting Hook the claws of the bottom frame plate to the mounting plate. If the claws are difficult to hook, A Mounting plate remove the front grille.
  • Page 50 SiBE12-908 Installation Manual Preparation before Installation Removing and installing front panel. • Removal method Hook fingers on the tabs on the left and right of the main body, and open until the panel stops. Slide the front panel sideways to disengage the rotating shaft.
  • Page 51 Installation Manual SiBE12-908 Preparation before Installation How to set the different addresses. When 2 indoor units are installed in 1 room, the 2 wireless remote controllers can be set for different addresses. 1) Remove the metal plate electrical wiring cover. (Refer to the Removal/attachment methods of metal plate electrical wiring covers.) ADDRESS...
  • Page 52 SiBE12-908 Installation Manual • Attachment methods of metal plate electrical wiring covers Attach the metal plate electrical wiring covers as shown below. 1) Lean the metal plate electrical wiring cover as shown in the figure and attach tab (1) on the lower side to the electrical wiring box.
  • Page 53 Installation Manual SiBE12-908 Refrigerant Piping Work Refrigerant piping. CAUTION 1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.) 2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.) 3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.

  • Page 54: Indoor Unit Installation

    SiBE12-908 Installation Manual Indoor Unit Installation Installing the mounting plate. • The mounting plate should be installed on a wall which can support the weight of the indoor unit. 1) Temporarily secure the mounting plate to the wall, make sure that the panel is completely level, and mark the boring points on the wall.
  • Page 55 Installation Manual SiBE12-908 Indoor Unit Installation Inter-unit wiring. 1) Open the front panel, then remove the service lid. Hang indoor unit’s hook here. 2) Pass the inter-unit wiring from the outdoor unit through the feed-through wall hole and then through the back of the indoor unit.
  • Page 56 SiBE12-908 Installation Manual Laying piping, hoses, and wiring. • Connect the humidifying hose to the indoor unit duct. Piping bundle diagram See 4. Humidifying hose installation work for details. Inter-unit wiring • Lay the piping, drain hose and humidifying hose Gas pipe according to the orientation of the piping coming out of Drain hose...
  • Page 57 Installation Manual SiBE12-908 Indoor Unit Installation • Left-side piping • Left-back piping • Left-bottom piping Humidifying hose Refrigerant pipe Drain hose Cut out the piping-through hole. Cut out the piping-through hole. Refrigerant pipe Refrigerant pipe Humidifying hose 1) Replace the drain plug and drain hose. (How to replace the drain plug and drain hose.) 2) Pull in the refrigerant piping and lay it so that it matches the liquid and gas piping marked on the mounting plate.
  • Page 58 SiBE12-908 Installation Manual Wiring. , install as described in the installation manual supplied with the multi outdoor With a multi indoor unit unit. 1) Strip wire ends (15mm). 2) Match wire colours with terminal numbers on indoor and outdoor unit’s terminal blocks and firmly screw wires to the corresponding terminals.
  • Page 59 Installation Manual SiBE12-908 Setting the Humidifying Hose Length CAUTION If the humidifying hose length is not set or it is set incorrectly, the humidifying capacity may diminish or strange sound may occur from humidifying hose. Setting the humidifying hose length. Set the humidifying hose length to ensure humidifying capacity.
  • Page 60 SiBE12-908 Installation Manual Trial Operation and Testing Trial operation and testing. 1-1 Measure the supply voltage and make sure that it falls in the specified range. 1-2 Trial operation should be carried out in either cooling or heating mode. • In cooling mode, select the lowest programmable temperature; in heating mode, select the highest programmable temperature.

  • Page 61: Outdoor Units

    Installation Manual SiBE12-908 Outdoor Units Outdoor Unit Installation Drawings Precautions for humidifying hose installation work. • Moisture on the outdoor unit is brought to the indoor unit together with air around the outdoor unit during humidifying operation. Install the outdoor unit in a clean and calm location. •...
  • Page 62 SiBE12-908 Installation Manual Installation • Install the unit horizontally. • The unit may be installed directly on a concrete verandah or a solid place if drainage is good. • If the vibration may possibly be transmitted to the building, use a vibration-proof rubber (field supply). Connections (connection port).
  • Page 63 Installation Manual SiBE12-908 Outdoor Unit Installation Guideline • Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation guidelines below. • For any of the below installation patterns, the wall height on the exhaust side should be 1200mm or less. Wall facing one side Walls facing two sides More than 50...
  • Page 64 SiBE12-908 Installation Manual Refrigerant Piping Work Installing outdoor unit. 1) When installing the outdoor unit, refer to “Precautions for Selecting the Location” on page 2 and the “Outdoor Unit Installation Drawings” on page 3. 2) If drain work is necessary, follow the procedures below. Drain work.
  • Page 65 Installation Manual SiBE12-908 Refrigerant Piping Work Purging air and checking gas leakage. WARNING 1) Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration cycle. 2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible. 3) R410A, as well as other refrigerants, should always be recovered and never be released directly into the environment.
  • Page 66 SiBE12-908 Installation Manual Refilling the refrigerant. Check the type of refrigerant to be used on the machine nameplate. Precautions when adding R410A Fill from the liquid pipe in liquid form. It is a mixed refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal operation. 1) Before filling, check whether the cylinder has a siphon attached or not.
  • Page 67 Installation Manual SiBE12-908 Refrigerant Piping Work Precautions for Laying Refrigerant Piping Wall Be sure to place a cap. • Cautions on pipe handling Rain If no flare cap is 1) Protect the open end of the pipe against dust and moisture. available, cover the flare mouth 2) All pipe bends should be as gentle as possible.

  • Page 68: Pump Down Operation

    SiBE12-908 Installation Manual Pump Down Operation In order to protect the environment, be sure to pump down when relocating or disposing of the unit. 1) Remove the valve caps on the liquid and the gas stop valves at the pipes for rooms A and B.
  • Page 69 Installation Manual SiBE12-908 Connecting the Humidifying Hose Connecting to indoor unit. Keep the following items in mind in order to prevent the degrading of humidification performance when connecting the humidifying hose to the indoor unit. 1) Cut the excessive portions of the humidifying hoses. * Determine the overall length of the humidifying hoses according to the installation manual for the indoor unit.
  • Page 70 SiBE12-908 Installation Manual Connecting to outdoor unit. There are 2 ways to connect humidifying hoses to the outdoor unit. <Back side> Connecting through the path under the humidifying hoses cover 1) Connect the humidifying hose (2m) to the humidifying duct on the back of the outdoor unit.
  • Page 71 Installation Manual SiBE12-908 Wiring WARNING 1) Do not use tapped wires, stranded wires (CAUTION 1)), extension cords, or starburst connections, as they may cause overheating, electrical shock, or fire. 2) Do not use locally purchased electrical parts inside the product. (Do not branch the power for the drain pump, etc., from the terminal block.) Doing so may cause electric shock or fire.
  • Page 72 SiBE12-908 Installation Manual Test Run and Final Check • Before starting the test run, measure the voltage at the primary side of the safety breaker. • Check that all liquid and gas stop valves are fully open. • Check that piping and wiring all match. Test run and final check.

  • Page 73: System Configuration

    System Configuration SiBE12-908 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 74: Operation Manual

    SiBE12-908 Operation Manual 3. Operation Manual Names of Parts Name of Parts Ind oor Unit Indoor Unit 1. Air filter 2. Titanium apatite photocatalytic air-purifying filter: • These filters are attached to the inside of the air filters. 3. Air inlet 4.
  • Page 75 Operation Manual SiBE12-908 Remote Contr oller Remote Controller 1. Signal transmitter: • It sends signals to the indoor unit. 2. Display (LCD): • It displays the current settings. (In this illustration, each section is shown with its displays ON for the purpose of explanation.) 3.

  • Page 76: Auto · Dry · Cool · Heat · Fan Operation

    SiBE12-908 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. T o start operation Press “MODE selector”...
  • Page 77 Operation Manual SiBE12-908 T o change the airflow rate setting Press “FAN setting” button. DRY mode AUTO or COOL or HEAT or FAN mode Five levels of airflow rate setting from “ ” to “ ” plus “ ” and “ ”...

  • Page 78: Adjusting The Airflow Direction

    SiBE12-908 Operation Manual Adjusting the Airflow Direction Adjusting the Airflow Direction You can adjust the airflow direction to increase your comfort. Adjusting the upper and lower airflow direction T o adjust the flaps (horizontal blades) Press “SWING ” button. • “...
  • Page 79 Operation Manual SiBE12-908 Adjusting the 3-D airflow direction T o start 3-D airflow 1. 3. Press the “SWING ” button and the “SWING ” button: the “ ” and “ ” display will light up and the flap and louvers will move in turn. To cancel 3-D airflow 2.

  • Page 80: Humid Heat Operation

    SiBE12-908 Operation Manual HUMID HEAT Operation HUMID HEAT Operation This function enables the humidification of a room where the air conditioner is in HEAT operation, thus providing appropriate humidity to the room if the function is used in wintertime during which the air is dry. When the humidity of the room is high, the user will feel warm enough even if the set temperature is dropped.
  • Page 81 Operation Manual SiBE12-908 NOTE Notes on “HUMID HEA T operation” at multi system • When the indoor units in both 2 rooms are set to HUMID HEAT operation/FRESH AIR SUPPLY VENTILATION, the indoor unit in either 1 of the room operate HUMID HEAT operation/FRESH AIR SUPPLY VENTILATION. (The indoor units in both 2 rooms do not simultaneously go into HUMID HEAT operation/FRESH AIR SUPPLY VENTILATION.) Priority is given to the indoor unit in either one of the rooms already in operation.

  • Page 82: Fresh Air Supply Ventilation

    SiBE12-908 Operation Manual FRESH AIR SUPPLY VENTILATION FRESH AIR SUPPLY VENTILATION This function takes in outdoor air to refresh indoor air. T o start FRESH AIR SUPPLY VENTILATION Press “HUMIDIFY/VENTILATE” button, and select a FRESH AIR SUPPLY VENTILATION mode. Mode Cyclic of humidity settings Multi-monitor lamp Lit white for 2 seconds.

  • Page 83: Comfort Airflow And Intelligent Eye Operation

    Operation Manual SiBE12-908 COMFORT AIRFLOW and INTELLIGENT EYE Operation COMFORT AIRFLOW and INTELLIGENT EYE Operation The INTELLIGENT EYE incorporates infrared sensors to detect the presence of people in the conditioned room. When these sensors detect people, the louvers will adjust the airflow direction to an area where people are not present.
  • Page 84 SiBE12-908 Operation Manual COMFORT AIRFLOW and INTELLIGENT EYE Operation “INTELLIGENT EYE” is useful for Energy Saving Ener gy saving operation • Change the temperature –2˚C in heating / +2˚C in cooling / +2˚C in dry mode from set temperature. • Decrease the airflow rate slightly in FAN mode only. If no presence detected in the room during 20 minutes. NOTE Notes on “INTELLIGENT EYE operation”...

  • Page 85: Powerful And Outdoor Unit Quiet Operation

    Operation Manual SiBE12-908 POWERFUL and OUTDOOR UNIT QUIET Operation POWERFUL and OUTDOOR UNIT QUIET Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by changing the frequency and fan speed on the outdoor unit.

  • Page 86: Econo Operation

    SiBE12-908 Operation Manual 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.

  • Page 87: Timer Operation

    Operation Manual SiBE12-908 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 88 SiBE12-908 Operation Manual TIMER Operation To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. (page 7.) Press “ON TIMER” button. • “ ” is displayed. “ ” blinks. •...

  • Page 89: Weekly Timer Operation

    Operation Manual SiBE12-908 3.10 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 lif e style. Using in these cases of WEEKLY TIMER An example of WEEKLY TIMER settings is shown below.
  • Page 90 SiBE12-908 Operation Manual WEEKLY TIMER Operation 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. (page 7.) Program 1 Program 2 Program 3 Program 4 25˚C 27˚C...
  • Page 91 Operation Manual SiBE12-908 Press “SELECT” button to select the desired temperature. • The temperature can be set between 10˚C and 32˚C. Cooling: The unit operates at 18˚C even if it is set at 10 to 17˚C. Heating: The unit operates at 30˚C even if it is set at 31 to 32˚C. •...

  • Page 92: Copy Mode

    SiBE12-908 Operation Manual WEEKLY TIMER Operation Copy mode • A reservation made once can be copied 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...
  • Page 93 Operation Manual SiBE12-908 Confirming a reservation • The reservation can be confirmed. Setting Displays Normal display Confirmation display Press “PROGRAM” button. • The day of the week and the reservation number of the current day will be displayed. Press “SELECT” button to select the day of the week and 1, 3 the reservation number to be confirmed.

  • Page 94: Note For Multi System

    SiBE12-908 Operation Manual 3.11 Note for Multi System Note for Multi System 〈〈 What is a “Multi System”? 〉〉 This system has one outdoor unit connected to multiple indoor units. Selecting the operation mode Outdoor room room room unit With the Priority Room Setting present but inactive or not Living Living Living...
  • Page 95 Operation Manual SiBE12-908 Installation / Operation Manual...
  • Page 96 SiBE12-908 Part 6 Service Diagnosis 1. Service Check Function ................95 1.1 Failure Diagnosis with Multi-Colored Indicator Lamp ......95 1.2 Failure Diagnosis by LED Indication ............96 1.3 Failure Diagnosis by Remote Controller..........97 2. Troubleshooting ..................100 2.1 Error Code Indication by Remote Controller ........100 2.2 Air conditioner does not run.
  • Page 97 SiBE12-908 2.38 Lights-out of Microcomputer Status Lamp..........160 3. Check ....................161 3.1 Fan Motor Connector Output Check ............161 3.2 Thermistor Resistance Check ..............162 3.3 Installation Condition Check..............163 3.4 Outdoor Fan System Check (DC Motor) ..........163 3.5 Power Supply Waveform Check............164 3.6 Main Circuit Electrolytic Capacitor Check ..........164 3.7 Refrigerant System Check ..............165 3.8 “Inverter Checker”...

  • Page 98: Service Check Function

    SiBE12-908 Service Check Function 1. Service Check Function Failure Diagnosis with Multi-Colored Indicator Lamp The multi-colored indicator lamp on the display of the indoor unit flashes when any of the following failure is detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions and the machine does not work.

  • Page 99: Failure Diagnosis By Led Indication

    Service Check Function SiBE12-908 Failure Diagnosis by LED Indication The following failure diagnosis can be done by LED indication on the outdoor unit PCB. 1. The outdoor unit has 2 green LED(LED A, LED5) on the PCB. The flashing green LED indicates "in order" condition. The turned ON or OFF LED indicates the failure related to the microcomputer.

  • Page 100: Failure Diagnosis By Remote Controller

    SiBE12-908 Service Check Function Failure Diagnosis by Remote Controller The temperature display sections on the remote controller indicate corresponding codes. 1. When the timer cancel button is held down for 5 seconds, a “ 00 ” indication flashes on the Check Method 1 temperature display section.
  • Page 101 Service Check Function SiBE12-908 Check Method 2 1. Press the 3 buttons (TEMP▲, TEMP▼, MODE) simultaneously. (R8381) “ 5C ” is displayed on the LCD. (R9420) 2. Select “ 5C ” with TEMP▲ or ▼ button. 3. Press the MODE button to enter the service check mode. The figure of the ten’s place blinks.
  • Page 102 SiBE12-908 Service Check Function 7. Press TEMP▲ or ▼ button and change the figure until you hear the sound of “beep”. 8. Diagnose by the sound. ★ “pi” : The figure of the ten’s place does not accord with the error code. ★...

  • Page 103: Troubleshooting

    Troubleshooting SiBE12-908 Troubleshooting Error Code Indication by Remote Controller * Various cases may be possible. Code Unit Description Reference page Air conditioner does not run. Air conditioner runs but does not get cooling (heating). Basic Failure Diagnosis When operation starts, safety breaker works. Air conditioner makes big noise and vibration.
  • Page 104 SiBE12-908 Troubleshooting Code Unit Description Reference page Freeze-up protection in other rooms / Unspecified voltage (between UA, UH indoor and outdoor units) System Lights-out of microcomputer status lamp – Service Diagnosis...

  • Page 105: Air Conditioner Does Not Run

    Troubleshooting SiBE12-908 Air conditioner does not run. Method of Malfunction Detection Malfunction Decision Conditions Supposed Power supply is OFF Improper power supply voltage Causes Improper connection of wire Incorrect combination of indoor unit and outdoor unit Battery shortage of remote controller Invalid address setting Protection device works (dirty air filter, insufficient gas, over filling, mixed air, etc.)
  • Page 106 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the power supply plug inserted into the Insert the power supply outlet or the breaker for plug into the outlet. Turn on the power supply the breaker for the power breaker ON?
  • Page 107 Troubleshooting SiBE12-908 Continued from the previous page Operation lamp flashes? Is an error code Diagnose by an error code Go to troubleshooting. displayed on the remote controller? Does it operate Replace the outdoor unit on test operation PCB. mode? Diagnose the indoor unit and the Go to LED diagnosis.

  • Page 108: Air Conditioner Runs But Does Not Get Cooling (Heating)

    SiBE12-908 Troubleshooting Air conditioner runs but does not get cooling (heating). Method of Malfunction Detection Malfunction Decision Conditions Supposed Incorrect temperature setting Incorrect combination of indoor unit and outdoor unit Causes Blocked air filter Insufficient power Refrigerant piping is too long Improper setting of piping length Defective field piping (squeezed, etc.) Service Diagnosis...
  • Page 109 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.02 Refer to P.162 Is the set Set the temperature Thermostat off temperature correct? properly. Is there required installation space? (Isn't it Secure required space.

  • Page 110: When Operation Starts, Safety Breaker Works

    SiBE12-908 Troubleshooting When operation starts, safety breaker works. Method of Malfunction Detection Malfunction Decision Conditions Supposed Insufficient capacity of safety breaker Earth leakage breaker is too sensitive Causes Not exclusive circuit The supply voltage is not within rated voltage ±10%. The size of connecting wire is thin (indoor power supply unit) Air is mixed (over filling) Damaged outdoor unit PCB (short circuit)
  • Page 111 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. [Power supply] Check No.29 Refer to P.171 Is the capacity of Replace the safety breaker safety breaker as to a specified one.

  • Page 112: Air Conditioner Makes Big Noise And Vibration

    SiBE12-908 Troubleshooting Air conditioner makes big noise and vibration. Method of Malfunction Detection Malfunction Decision Conditions Supposed Piping length is too short Mounting wall is too thin Causes Insufficient vibration prevention measures Deformation of the unit Improper quantity of refrigerant Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution...

  • Page 113: Air Does Not Humidified Enough

    Troubleshooting SiBE12-908 Air does not humidified enough. Method of Malfunction Detection Malfunction Decision Conditions Supposed Hose length is not set Incorrect hose length setting Causes Short circuited at outdoor unit Blocked humidification filter Insufficient heat insulation of duct Indoor ventilation is made too often Ceiling is very high.
  • Page 114 Repair breakage or remove hose? blockage. Is the humidification hose Use the proper hose proper? specified by DAIKIN. Does the outdoor unit suck the Improve so as not to get exhausted air again by short-circuit. short-circuit? Many (screens, consecutives room ) many times are the room Explain to the user.
  • Page 115 Troubleshooting SiBE12-908 Continued from the previous page Is the High set temperature by remote Explain to the user. controller too high? Is the outdoor temperature or Explain to the user. humidity extremely low? Not low Set the air outlet at the height of 1.8 m.

  • Page 116: Indoor Unit Pcb Abnormality

    SiBE12-908 Troubleshooting 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 Causes Faulty connector connection Troubleshooting...

  • Page 117: Freeze-Up Protection Control Or High Pressure Control

    Troubleshooting SiBE12-908 Freeze-up Protection Control High Pressure Control Remote Controller Display Method of High pressure control 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 Freeze-up protection control (operation halt) is activated during cooling operation according to the temperature detected by the indoor unit heat exchanger thermistor.
  • Page 118 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.02 Check the air passage. Refer to P.162 Is there any short-circuit? Provide sufficient air passage. Check the intake air filter. Clean the air filter.

  • Page 119: Fan Motor (Dc Motor) Or Related Abnormality

    Troubleshooting SiBE12-908 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 120 SiBE12-908 Troubleshooting 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 the power supply and rotate the fan by Refer to P.161 hand. Does the fan rotate Replace fan motor.

  • Page 121: Thermistor Or Related Abnormality (Indoor Unit)

    Troubleshooting SiBE12-908 2.10 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 122: Humidity Sensor Abnormality

    SiBE12-908 Troubleshooting 2.11 Humidity Sensor Abnormality Remote Controller Display Method of Sensor abnormality is detected by input value. Malfunction Detection Malfunction When the input from a temperature sensor is 4.96 V or more or 0.04 V or less* Decision Conditions Supposed Improper connector connection Defective indoor control PCB...

  • Page 123: Signal Transmission Error (Indoor Unit - Outdoor Unit)

    Troubleshooting SiBE12-908 2.12 Signal Transmission Error (Indoor Unit - Outdoor Unit) Remote Controller Display Outdoor Unit LED A 5 5 5 Display Method of The data sent from the outdoor unit is checked for problem. Malfunction Detection Malfunction When the data sent from the outdoor unit can not be received without error, or when the disable status of signal transmission continues for 15 sec..
  • Page 124 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the relay wire between the indoor unit and the outdoor unit for color and number Is there any improper Correct relay wire between wiring? * For the machine with stand-...

  • Page 125: Incompatible Power Supply Between Indoor Unit And Outdoor Unit

    Troubleshooting SiBE12-908 2.13 Incompatible Power Supply between Indoor Unit and Outdoor Unit Remote Controller Display Method of Check the incompatible power supply between indoor unit and outdoor unit by using signal transmission. Malfunction Detection Method of In case that the indoor intake model is connected to outdoor intake model. Malfunction Detection Supposed...

  • Page 126: Incomplete Setting For Hose Length

    SiBE12-908 Troubleshooting 2.14 Incomplete Setting for Hose Length Remote Controller Display Method of This fault occurs when the humidification hose length is not stored in the EEPROMs of the indoor unit and the outdoor unit. Malfunction (Hose length is not stored at initial power on.) Detection Malfunction When the humidification hose length is not stored in EEPROMs of the indoor unit and the...

  • Page 127: Freeze-Up Protection In Other Rooms / Unspecified Voltage (Between Indoor And Outdoor Units)

    Troubleshooting SiBE12-908 2.15 Freeze-up Protection in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units) UA , UH Remote Controller Display Method of A wrong connection is detected by checking the combination of indoor and outdoor units on the microcomputer.

  • Page 128: Outdoor Unit Pcb Abnormality

    SiBE12-908 Troubleshooting 2.16 Outdoor Unit PCB Abnormality Remote Controller Display Outdoor Unit LED A 5 5 5 A 7 5 5 (zero-cross abnormality) Display Method of Detect within the programme of the microcomputer that the programme is in good running order.

  • Page 129: Ol Activation (Compressor Overload)

    Troubleshooting SiBE12-908 2.17 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 130: Compressor Lock

    SiBE12-908 Troubleshooting 2.18 Compressor Lock Remote Controller Display Outdoor Unit LED 5 5 ( - ) Display Method of Judging from current waveform generated when high-frequency voltage is applied to the compressor. Malfunction Detection Malfunction The machine is shut down when the fault count reaches 16. Clear condition: Continuous operation for 11 min.

  • Page 131: Dc Fan Lock

    Troubleshooting SiBE12-908 2.19 DC Fan Lock Remote Controller Display Outdoor Unit LED 5 5 ( - ) Display Method of Identify the fan motor system fault based on fan speed detected by Hall IC during high pressure fan motor running. Malfunction Detection Malfunction...

  • Page 132: Input Overcurrent Detection

    SiBE12-908 Troubleshooting 2.20 Input Overcurrent Detection Remote Controller Display Outdoor Unit LED 5 5 ( - ) Display Method of Detect an input overcurrent by checking the inverter power consumption or the input current detected by CT with the compressor running. Malfunction Detection Malfunction...
  • Page 133 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. *Input over current may be caused by improper wiring inside the machine. If the Check No.03 machine stops due to input over current after connecting or disconnecting wires to replace part, check wiring for proper connection.

  • Page 134: Discharge Pipe Temperature Control

    SiBE12-908 Troubleshooting 2.21 Discharge Pipe Temperature Control Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Discharge pipe temperature control (stop, frequency attenuation, etc.) is executed based on the temperature detected by the discharge pipe thermistor. Malfunction Detection Malfunction...

  • Page 135: High Pressure Control In Cooling

    Troubleshooting SiBE12-908 2.22 High Pressure Control in Cooling Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of During cooling, high pressure control (stop, frequency attenuation, etc.) is executed according to the temperature detected by the heat exchanger thermistor. Malfunction Detection Malfunction...
  • Page 136 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.02 Check installation space Refer to P.162 Check No. 03 Change the position of air Installation condition check discharge grille.

  • Page 137: Compressor Sensor System Abnormality

    Troubleshooting SiBE12-908 2.23 Compressor Sensor System Abnormality Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Fault condition is identified by DC current which is detected before compressor startup. Malfunction Detection Malfunction When the DC voltage is 50 V or less. Decision Conditions Supposed...

  • Page 138: Damper Abnormality

    SiBE12-908 Troubleshooting 2.24 Damper Abnormality Remote Controller Display Outdoor Unit LED Display Method of Detected by the limit switch (LS) in the humidification unit. Malfunction Detection Malfunction Limit switch does not turn on or off when the operation of humidification unit starts or finishes.

  • Page 139: Position Sensor Abnormality

    Troubleshooting SiBE12-908 2.25 Position Sensor Abnormality Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Startup failure of the compressor is identified by rpm information of the compressor and by electric component position detector. Malfunction Detection Malfunction When the compressor does not run for 15 sec.
  • Page 140 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.16 Check the power supply Refer to P.168 Check No. 16 Discharge pressure check Check No.29 Refer to P.171 Judge Replace stop valve.

  • Page 141: Dc Voltage / Dc Current Sensor Abnormality

    Troubleshooting SiBE12-908 2.26 DC Voltage / DC Current Sensor Abnormality Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of DC voltage or DC current sensor system abnormality is identified based on the compressor operation frequency and the input current detected by the product of DC current and DC Malfunction voltage.

  • Page 142: Thermistor Or Related Abnormality (Outdoor Unit)

    SiBE12-908 Troubleshooting 2.27 Thermistor or Related Abnormality (Outdoor Unit) Remote Controller Display Outdoor Unit LED Display Method of This fault is identified based on the thermistor input voltage to the microcomputer. A thermistor fault is identified based on the temperature detected by each thermistor. Malfunction Detection Malfunction...
  • Page 143 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn on the power supply again Check No.02 Refer to P.162 Does the remote controller display Reconnect properly. the error code again? Check No.02...

  • Page 144: Abnormal Temperature In Electrical Box

    SiBE12-908 Troubleshooting 2.28 Abnormal Temperature in Electrical Box Remote Controller Display Outdoor Unit LED Display Method of Temperature rise in the electrical box is identified based on the temperature of the radiation fin detected by the fin thermistor with the compressor off. Malfunction Detection Malfunction...
  • Page 145 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. (Note on resetting power supply) To reset the machine, power off status need to continue at least 30 sec. Check No.02 Refer to P.162 WARNING...

  • Page 146: Temperature Rise In Radiation Fin

    SiBE12-908 Troubleshooting 2.29 Temperature Rise in Radiation Fin Remote Controller Display Outdoor Unit LED Display Method of Temperature rise in the radiation fin is identified based on the temperature of the radiation fin detected by the fin thermistor with the compressor on. Malfunction Detection Malfunction...
  • Page 147 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.02 WARNING Turn off the power supply and Refer to P.162 turn it on again to get the system To cool down the electricals, the started.

  • Page 148: Output Overcurrent

    SiBE12-908 Troubleshooting 2.30 Output Overcurrent Remote Controller Display Outdoor Unit LED 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. A speed error occurs while the compressor is running.
  • Page 149 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. *Output overcurrent may caused by improper wiring inside the machine. If the machine stops due to output overcurrent after connecting or disconnecting wires to replace part, check wiring for proper connection.

  • Page 150: Insufficient Gas

    SiBE12-908 Troubleshooting 2.31 Insufficient Gas Remote Controller Display Outdoor Unit LED 55 ( - ) 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 151 Troubleshooting SiBE12-908 Be sure to turn off power switch before connect or disconnect connector, Troubleshooting Caution or parts damage may be occurred. Is the stop Check No.02 Open the stop valve. valve opened? Refer to P.162 Check gas leakage. Check No.17 Refer to P.169 Oil oozing at relay pipe Repair flared portion of...

  • Page 152: Over Voltage Protection / Low Voltage Protection

    SiBE12-908 Troubleshooting 2.32 Over Voltage Protection Low Voltage Protection Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Detect an abnormal increase or drop of voltage by the detection circuit or DC voltage detection circuit. Malfunction Detection Malfunction When an overcurrent signal is sent to the microcomputer from the overcurrent detection...

  • Page 153: Outdoor Unit Pcb Abnormality Or

    Troubleshooting SiBE12-908 2.33 Outdoor Unit PCB Abnormality Communication Circuit Abnormality Remote Controller Display Outdoor Unit LED Display Method of Detect within the programme of the microcomputer that the programme is in good running order. Malfunction Detection Malfunction 1. When the programme of the microcomputer is in bad running order. 2.
  • Page 154 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check indoor unit also, because a comunication circuit fault may be caused by the problem related to the indoor unit. Check supply voltage Rated voltage? Rectify the power supply.
  • Page 155 Troubleshooting SiBE12-908 Continued from the previous page Check No.08 Refer to P.164 Does LED A turn off? Check grounding Grounded? Carry out grounding work. The cause seems to be an external factor other than Check No.08 failure of the outdoor unit Power supply waveform check PCB.

  • Page 156: Signal Transmission Error On Outdoor Unit Pcb

    SiBE12-908 Troubleshooting 2.34 Signal Transmission Error on Outdoor Unit PCB Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Communication error between microcomputer mounted on the main body and inverter. Malfunction Detection Malfunction When the data sent from the microcomputer of the inverter can not be received successively for 9 sec., the machine shuts down.
  • Page 157 Troubleshooting SiBE12-908 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check flashing interval of LED 5 YES (0.5 sec. interval) Is it 0.5 sec.? (same as LED A) (0.2 sec.

  • Page 158: Fan Motor System Abnormality / Fan Lock

    SiBE12-908 Troubleshooting 2.35 Fan Motor System Abnormality Fan Lock Remote Controller Display Outdoor Unit LED Display Method of During humidification fan motor running, fan motor system abnormality is identified based on the fan speed (rpm) detected by Hall IC. Malfunction Detection Malfunction <Humidification fan>...

  • Page 159: Heater Wire Abnormality

    Troubleshooting SiBE12-908 2.36 Heater Wire Abnormality Remote Controller Display Outdoor Unit LED Display Method of A fault is identified when the outlet temperature of humidification fan does not reach a certain temperature within a given time after the heater turned on. Malfunction Detection Malfunction...
  • Page 160 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.02 Is the supply voltage Modify supply voltage. Refer to P.162 appropriate? Power supply OFF Is heater well cooled? Cool it down.

  • Page 161: Humidification Fan Outlet Thermistor Abnormality / Heater Temperature Abnormality

    Troubleshooting SiBE12-908 2.37 Humidification Fan Outlet Thermistor Abnormality / Heater Temperature Abnormality Remote Controller Display Outdoor Unit LED Display Method of Detect short circuit and wire breakage of humidification thermistor. When humidification fan outlet temperature becomes high, this condition is identified as an Malfunction abnormal heater temperature fault.
  • Page 162 SiBE12-908 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check connector for proper Check No.02 connection Refer to P.162 Is it OK? Reconnect properly. Check No.05 Refer to P.163 Check No.02 *The humidification Thermistor resistance check...

  • Page 163: Lights-Out Of Microcomputer Status Lamp

    Troubleshooting SiBE12-908 2.38 Lights-out of Microcomputer Status Lamp Remote — Controller Display Outdoor Unit LED 51 ( - ) Display Method of When a microcomputer fault is detected, LED A or LED 5 turns off. Malfunction Detection Malfunction Decision Conditions Supposed Outdoor unit PCB is not power supplied Power supply failure due to noise...

  • Page 164: Check

    SiBE12-908 Check 3. Check 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. Check rotation pulse input (pins 4-1). Upper fan connector Motor power supply voltage Unused...

  • Page 165: Thermistor Resistance Check

    Check SiBE12-908 Thermistor Resistance Check Check No.02 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. Thermistor R25°C=20kΩ...

  • Page 166: Installation Condition Check

    SiBE12-908 Check Installation Condition Check Check No.03 Installation condition check Check the allowable Abnormal dimensions of the air Change the position of the air suction and discharge discharge grille or the area. installation location. Normal Does the discharged air from other outdoor unit Change the position of the air cause an increase...

  • Page 167: Power Supply Waveform Check

    Check SiBE12-908 Power Supply Waveform Check Check No.08 Check the voltage waveform between power supply terminals on the terminal board for disturbance using oscillo-tester. 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] Main Circuit Electrolytic Capacitor Check...

  • Page 168: Refrigerant System Check

    SiBE12-908 Check Refrigerant System Check Check No.12 Refrigerant system check Models with discharge pipe thermistor (blockage, gas leakage, insufficient gas are to be checked) Is the discharge pipe Rectify. thermistor disconnected from the holder? Is the temperature of Four way valve operation suction pipe of four way fault, replace it.

  • Page 169: Inverter Checker" Check

    Check SiBE12-908 “Inverter Checker” Check Check No.14 1. Characteristics If abnormal stop occurs due to compressor startup failure or overcurrent output when using inverter unit, it is difficult to judge it results from the compressor failure or other failure (control PCB, power transistor, etc.).

  • Page 170: Power Transistor Check

    SiBE12-908 Check 3. Diagnose method (Diagnose can be made according to 6 LEDs lighting status as follows:) (1) When all LEDs are lit uniformly, → Compressor malfunction (to be replaced) (2) When some of LEDs are not lit (LEDs are not lit or go off, etc.): Check the individual power transistor.

  • Page 171: Discharge Pressure Check

    Check SiBE12-908 3.10 Discharge Pressure Check Check No.16 Discharge pressure check Is it high? Replace the compressor. Is the stop valve open? Open the stop valve. Is the connection pipe Replace the field piping. deformed? Are the heat exchanger Clean it. and air filter dirty? Replace the compressor.

  • Page 172: Electronic Expansion Valve Check

    SiBE12-908 Check 3.11 Electronic Expansion Valve Check Check No.17 Check the electronic expansion valve (EV) as follows: 1. Check if the EV connector properly inserted into the control PCB. Collate the number of EV main body with that of the connector. 2.

  • Page 173: Rotating Pulse Input On Outdoor Unit Pcb Check

    Check SiBE12-908 3.12 Rotating Pulse Input on Outdoor Unit PCB Check Check No.23 < For propeller fan motor or humidification fan> Make sure voltage of 270 ± 30 V is applied. 1. Set power ON and operation OFF. Remove connector S70 or S72. 2.

  • Page 174: Main Circuit Short Check

    SiBE12-908 Check 3.13 Main Circuit Short Check Check No.29 Measure the resistance between pins at both ends of DB1. If the resistance is ∞ or less than 1 k Ω , the main circuit short. (–) terminal of the tester (in case of digital, (–) (+) terminal)

  • Page 175: Four-Way Valve Performance Check

    Check SiBE12-908 3.14 Four-way Valve Performance Check Check No.31 < Caution on resetting the power supply > ∗ Be sure to wait for 30 sec. or more after turning off the power supply. Turn off the power and turn it on again.

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