Daikin FTXS30HVJU Service Manual
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Daikin FTXS30HVJU Service Manual

Inverter pair wall mounted type h-series
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Download this manual See also: Operating Manual, Engineering Data
Inverter Pair
Wall Mounted Type H-Series
[Applied Models]
 Inverter Pair : Heat Pump
SiUS04-924

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  • Page 1 SiUS04-924 Inverter Pair Wall Mounted Type H-Series [Applied Models]  Inverter Pair : Heat Pump...

  • Page 2: Table Of Contents

    SiUS04-924 Inverter Pair H-Series Heat Pump Indoor Units FTXS30HVJU FTXS36HVJU Outdoor Units RXS30HVJU RXS36HVJU Inverter Pair H-Series Part 1 List of Functions ..............1 1. List of Functions ..................2 Part 2 Specifications ............... 3 1. Specifications ....................4 Part 3 Printed Circuit Board Connector Wiring Diagram ............
  • Page 3 SiUS04-924 Part 4 Function and Control............11 1. Main Functions..................12 1.1 Frequency Principle..................12 1.2 Airflow Direction Control................14 1.3 Fan Speed Control for Indoor Units............15 1.4 Program Dry Function ................16 1.5 Automatic Operation................... 17 1.6 Thermostat Control..................18 1.7 NIGHT SET Mode ..................
  • Page 4 SiUS04-924 2.10 WEEKLY TIMER Operation ............... 60 Part 6 Service Diagnosis..............66 1. Caution for Diagnosis................67 2. Problem Symptoms and Measures ............68 3. Service Check Function ................69 4. Troubleshooting ..................72 4.1 Error Codes and Description ..............72 4.2 Indoor Unit PCB Abnormality ..............73 4.3 Freeze-up Protection Control or High Pressure Control......
  • Page 5 SiUS04-924 1.6 Removal of Fan Motor................143 1.7 Removal of Heat Exchanger ..............146 1.8 Removal of Fan Rotor ................150 2. Outdoor Unit....................152 2.1 Removal of Outer Panels ................. 153 2.2 Removal of the Electrical Box ..............166 2.3 Removal of PCB..................170 2.4 Removal of Fan Motor................

  • Page 6: Safety Considerations

    SiUS04-924 Safety Considerations SAFETY CONSIDERATIONS • If refrigerant gas is discharged during repair work, do not touch the discharged refrigerant gas. The refrigerant gas may cause frostbite. Read these SAFETY CONSIDERATIONS carefully before • Use only pipes, flare nuts, tools, and other materials performing any repair work.
  • Page 7 Safety Considerations SiUS04-924 may generate toxic gases if it comes into contact with • Do not use a joined power cable or an extension cord, flames. or share the same power outlet with other electrical appliances as it may cause an electrical shock or fire. CAUTION •...

  • Page 8: Part

    SiUS04-924 Part 1 List of Functions 1. List of Functions ..................2 List of Functions...

  • Page 9: List Of Functions

    SiUS04-924 List of Functions 1. List of Functions Category Functions Category Functions  Basic Function Inverter (with Inverter Power Control) Health & Air Air-Purifying Filter — Cleaning *(0)14~  Operation Limit for Cooling (°FDB) Photocatalytic Deodorizing Filter — 114.8 Air-Purifying Filter Operation Limit for Heating (°FWB) —...

  • Page 10: Specifications

    SiUS04-924 Part 2 Specifications 1. Specifications ....................4 Specifications...

  • Page 11: Specifications

    SiUS04-924 Specifications 1. Specifications 60Hz 208-230V Indoor Units FTXS30HVJU FTXS36HVJU Models RXS30HVJU RXS36HVJU Outdoor Units Cooling Heating Cooling Heating 8.8 (3.0~8.8) 10.2 (3.0~10.2) 10.2-10.5 (3.0~10.2-10.5) 10.5-11.1 (3.0~10.5-11.1) 35,000-36,000 36,000-38,000 Capacity Btu/h 30,000 (10,200~30,000) 34,800 (10,200~34,800) (10,200~35,000-36,000) (10,200~36,000-38,000) Rated (Min.~Max.) 8,770-9,030...
  • Page 12 Specifications SiUS04-924 Conversion Formulae Note:  The data are based on the conditions shown in the table below. kcal/h=kW 860 Cooling Heating Piping Length Btu/h=kW 3414 Indoor ; 80°FDB/67°FWB Indoor ; 70°FDB/60°FWB cfm=m /min 35.3 25ft (7.5 m) Outdoor ; 95°FDB/75°FWB Outdoor ;...

  • Page 13: Printed Circuit Board

    SiUS04-924 Part 3 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram........7 1.1 Indoor Unit....................7 1.2 Outdoor Unit ....................9 Printed Circuit Board Connector Wiring Diagram...

  • Page 14: Printed Circuit Board Connector Wiring Diagram

    SiUS04-924 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram Indoor Unit Connectors PCB (1) (Control PCB) 1) S1 Connector for DC fan motor 2) S21 Connector for centralized control (HA) 3) S25 Connector for INTELLIGENT EYE sensor 4) S32 Connector for heat exchanger thermistor 5) S41...
  • Page 15 Printed Circuit Board Connector Wiring Diagram SiUS04-924 PCB Detail PCB (1): Control PCB LED A S47 JC JB S21 2P227881-1B PCB (2): Signal Receiver PCB PCB (3): Display PCB RTH1 LED3 LED2 LED1 3P224121-1A 3P224121-1A Printed Circuit Board Connector Wiring Diagram...

  • Page 16: Outdoor Unit

    SiUS04-924 Printed Circuit Board Connector Wiring Diagram Outdoor Unit Connectors PCB (1) (Main PCB) 1) S10 Connector for terminal strip (indoor-outdoor transmission) 2) S20 Connector for electronic expansion valve coil 3) S40 Connector for overload protector 4) S51, S101 Connector for service monitor PCB 5) S70 Connector for fan motor 6) S80...
  • Page 17 Printed Circuit Board Connector Wiring Diagram SiUS04-924 PCB Detail PCB (1): Main PCB FU2 (3.15A) (30A) S101 S51 FU3 (3.15A) (R9653) PCB (2): Service Monitor PCB LED A S102 3P169059 Printed Circuit Board Connector Wiring Diagram...

  • Page 18: Function And Control

    SiUS04-924 Part 4 Function and Control 1. Main Functions..................12 1.1 Frequency Principle..................12 1.2 Airflow Direction Control................14 1.3 Fan Speed Control for Indoor Units............15 1.4 Program Dry Function ................16 1.5 Automatic Operation................... 17 1.6 Thermostat Control..................18 1.7 NIGHT SET Mode ..................

  • Page 19: Main Functions

    SiUS04-924 Main Functions 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 ...
  • Page 20 Main Functions SiUS04-924 The compressor rotational speed is increased when starting the heating (or cooling) operation. This enables a quick set temperature. Air discharge temperature 113˚F(45˚C) inverter normal heat pump Start seconds (R9853)  Even during extreme cold weather, a high capacity is achieved. It is maintained even when the outdoor air temperature is 36°F(2°C).

  • Page 21: Airflow Direction Control

    SiUS04-924 Main Functions Airflow Direction Control Power-Airflow The large louvers send a large volume of air downwards to the floor. The louver provides an optimum control area in cooling, heating, and dry mode. Dual Louvers Heating Mode During heating mode, the large louver directs warm air straight downward and across the floor to pervade the entire room.

  • Page 22: Fan Speed Control For Indoor Units

    Main Functions SiUS04-924 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 section, Fan Motor (DC Motor) or Related Abnormality on page 76.

  • Page 23: Program Dry Function

    SiUS04-924 Main Functions Program Dry Function Program 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 24: Automatic Operation

    Main Functions SiUS04-924 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 operation startup, and automatically operates in that mode. The unit automatically switches the operation mode to cooling or heating to maintain the room temperature at the main unit setting temperature.

  • Page 25: Thermostat Control

    SiUS04-924 Main Functions 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 zone A. Thermostat ON Condition  The temperature difference is above zone C after being in zone A. ...

  • Page 26: Night Set Mode

    Main Functions SiUS04-924 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 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 27: Econo Mode

    SiUS04-924 Main Functions ECONO Mode Outline The ECONO mode is a function that sets a limit for power consumption. This mode is particularly convenient for energy-saving users. It is also a major bonus for those whose breaker capacities do not allow the use of multiple electrical devices and air conditioners. It is easily activated from the wireless remote controller by pushing the ECONO button.

  • Page 28: Intelligent Eye

    Main Functions SiUS04-924 INTELLIGENT EYE This function detects movement in the room by a human motion sensor (INTELLIGENT EYE), reducing capacity when the room is empty in order to save electricity. Processing 1. Detection method by INTELLIGENT EYE If the sensor detects the outputs 10 times/sec. or more, it judges humans are present.
  • Page 29 SiUS04-924 Main Functions  Since the set temperature is shifted by 3.6°F (2°C) higher for 40 minutes, the compressor speed lowers to save energy. The thermostat goes off due to the shifting of temperature so the thermostat-off action is prohibited for 40 minutes to prevent this phenomena. After this 40 minutes, the prohibition of the thermostat-off is cancelled and it resumes conditions to conduct thermostat-off, depending on the room temperature.

  • Page 30: Inverter Powerful Operation

    Main Functions SiUS04-924 1.10 Inverter POWERFUL Operation Outline To optimize the cooling and heating capacity, operate the air conditioner by increasing the indoor fan rotating speed and the compressor frequency. Details of the When the POWERFUL button is pushed in each operation mode, the fan speed / setting Control temperature will be converted to the following states in a period of 20 minutes.

  • Page 31: Other Functions

    SiUS04-924 Main Functions 1.11 Other Functions 1.11.1 Hot Start Function In order to prevent the cold air blast that normally comes when heating is started, the temperature of the heat exchanger in the indoor unit is detected, and either the airflow stops or lowers to ensure comfortable heating of the room.
  • Page 32 Main Functions SiUS04-924 1.11.7 WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total). ON / OFF, Temperature and Time items can be set. Refer to WEEKLY TIMER Operation on page 60 for detail. Function and Control...

  • Page 33: Function Of Thermistor

    SiUS04-924 Function of Thermistor 2. Function of Thermistor Electrontic expansion valve Four-way valve Compressor (R5204) A 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 target Thermistor discharge temperature can be obtained.

  • Page 34: Control Specification

    Control Specification SiUS04-924 3. Control Specification Mode Hierarchy Outline There are two modes; the mode selected by the user (normal air conditioning mode) and forced operation mode for installing and servicing. Detail For heat pump model Modes available are stop, cooling (includes drying), and heating (includes defrosting) Air conditioner control mode Forced operating mode Forced cooling (for Pump Down Operation)

  • Page 35: Frequency Control

    SiUS04-924 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.
  • Page 36 Control Specification SiUS04-924 Indoor Frequency Command (D signal) The difference between the 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 37: Controls At Mode Changing / Start-Up

    SiUS04-924 Control Specification Controls at Mode Changing / Start-up 3.3.1 Preheating Operation Outline Operate the inverter in the open phase operation with conditions including the preheating command, outdoor air temperature, and discharge pipe temperature from the indoor side. Outside temperature  50°F(10°C)  Control A (preheating for normal state) Detail Outside temperature <...
  • Page 38 Control Specification SiUS04-924 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 39: Discharge Pipetemperature Control

    SiUS04-924 Control Specification 3.3.5 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. discharge pipe temp. 55.4˚F(13˚C) 35.6˚F(2˚C) 33.8˚F(1˚C) 33.8˚F(1˚C) 48.2˚F(9˚C) 68.0˚F(20˚C) outdoor temp.

  • Page 40: Input Current Control

    Control Specification SiUS04-924 Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets 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 41: Freeze-Up Protection Control

    SiUS04-924 Control Specification 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 shown in the following diagram: Detail Conditions for Start Controlling Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from...

  • Page 42: Fan Control

    Control Specification SiUS04-924 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. Fan control for maintaining pressure difference 5.
  • Page 43 SiUS04-924 Control Specification 62 Hz 39 Hz PI control Frequency 0 Hz 120 sec. 60 sec. 650 sec. (Max. limit) 60 sec. Compressor Four-way valve 5 sec. 5 sec. Outdoor temp. 3 32°F(0°C) Outdoor temp. < 32°F(0°C) 450 pulse Electronic expansion valve opening Initial opening 350 pulse...

  • Page 44: Electronic Expansion Valve Control

    Control Specification SiUS04-924 3.11 Electronic Expansion Valve Control Outline The following are control examples that function in each mode with the electronic expansion valve control: Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2.
  • Page 45 SiUS04-924 Control Specification 3.11.1 Fully Closed 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 46: Target Discharge Pipe Temperature Control

    Control Specification SiUS04-924 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.

  • Page 47: Malfunctions

    SiUS04-924 Control Specification 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 and Overcurrent Outline In order to protect the inverter, detect an excessive output current, and for protecting compressor,...

  • Page 48: Forced Operation Mode

    Control Specification SiUS04-924 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 standby mode. 2) The operating mode of the outdoor unit is the stop mode.

  • Page 49: Facility Setting Switch (Cooling At Low Outdoor Temperature)

    SiUS04-924 Control Specification 3.15 Facility Setting Switch (cooling at low outdoor temperature) Outline This function is limited to facilities where the air conditioning is for cooling equipment, such as a computer room. Never use it in occupied spaces such as residences or offices. Detail You can expand the operation range to 0°F(–17.8°C) by turning on switch B (SW4) on the PCB.
  • Page 50 Control Specification SiUS04-924 Function and Control...

  • Page 51: Operation Manual

    SiUS04-924 Part 5 Operation Manual 1. System Configuration................45 2. Instruction....................46 2.1 Remote Controller ..................46 2.2 AUTO · DRY · COOL · HEAT · FAN Operation .......... 48 2.3 Adjusting the Airflow Direction..............50 2.4 COMFORT AIRFLOW Operation ............... 52 2.5 INTELLIGENT EYE Operation ..............

  • Page 52: System Configuration

    SiUS04-924 System Configuration 1. System Configuration After the installation and test operation of the room air conditioner have been completed, follow instructions in this section to properly operate the system. Providing thorough instructions to the user can reduce requests for servicing by 80%. However proficient the installation and operating functions of the AC system are, , the customer may blame either the room air conditioner or its installation work because of improper handling.

  • Page 53: Instruction

    Instruction SiUS04-924 2. Instruction Remote Controller Operation Manual...
  • Page 54 SiUS04-924 Instruction operation Operation Manual...

  • Page 55: Auto · Dry · Cool · Heat · Fan Operation

    Instruction SiUS04-924 AUTO · DRY · COOL · HEAT · FAN Operation Operation Manual...
  • Page 56 SiUS04-924 Instruction Operation Manual...

  • Page 57: Adjusting The Airflow Direction

    Instruction SiUS04-924 Adjusting the Airflow Direction louvers (horizontal blades): is displayed on the LCD and the louvers will begin to swing. louvers have reached the desire position, The louvers will stop moving. is no longer displayed on the LCD. To adjust the fins (vertical blades): When the fins have reached the desired The fins will stop moving.
  • Page 58 SiUS04-924 Instruction fins fins fins fins angles. Inside Operation Manual...

  • Page 59: Comfort Airflow Operation

    Instruction SiUS04-924 COMFORT AIRFLOW Operation provides a comfortable airflow Operation Manual...

  • Page 60: Intelligent Eye Operation

    SiUS04-924 Instruction INTELLIGENT EYE Operation fins above Operation Manual...
  • Page 61 Instruction SiUS04-924 Operation Manual...

  • Page 62: Powerful Operation

    SiUS04-924 Instruction POWERFUL Operation Operation Manual...

  • Page 63: Outdoor Unit Quiet Operation

    Instruction SiUS04-924 OUTDOOR UNIT QUIET Operation Operation Manual...

  • Page 64: Econo Operation

    SiUS04-924 Instruction ECONO Operation Operation Manual...

  • Page 65: Timer Operation

    Instruction SiUS04-924 TIMER Operation Operation Manual...
  • Page 66 SiUS04-924 Instruction Operation Manual...

  • Page 67: Weekly Timer Operation

    Instruction SiUS04-924 2.10 WEEKLY TIMER Operation Examples of using the WEEKLY TIMER settings: Up to 4 settings per day and 28 settings per week can be made with the WEEKLY TIMER. The effective use of the copy mode ensures the ease of making settings. Operation Manual...
  • Page 68 SiUS04-924 Instruction The day of the week and the setting number is displayed. and the setting number. changes the setting number and the day of the week. Operation Manual...
  • Page 69 Instruction SiUS04-924 Operation Manual...
  • Page 70 SiUS04-924 Instruction Operation Manual...
  • Page 71 Instruction SiUS04-924 Operation Manual...
  • Page 72 SiUS04-924 Instruction 3P228444-2B Operation Manual...

  • Page 73: Service Diagnosis

    SiUS04-924 Part 6 Service Diagnosis 1. Caution for Diagnosis................67 2. Problem Symptoms and Measures ............68 3. Service Check Function ................69 4. Troubleshooting ..................72 4.1 Error Codes and Description ..............72 4.2 Indoor Unit PCB Abnormality ..............73 4.3 Freeze-up Protection Control or High Pressure Control......74 4.4 Fan Motor (DC Motor) or Related Abnormality...........

  • Page 74: Caution For Diagnosis

    SiUS04-924 Caution for Diagnosis 1. Caution for Diagnosis The operation lamp flashes when any of the following errors are detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation. 2.

  • Page 75: Problem Symptoms And Measures

    Problem Symptoms and Measures SiUS04-924 2. 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 76: Service Check Function

    SiUS04-924 Service Check Function 3. Service Check Function Check Method 1 1. When the timer cancel button is held down for 5 seconds, a “00” indication flashes on the temperature display section. <Open the front cover> TIMER CANCEL button < ARC452A6 > (R9673) 2.
  • Page 77 Service Check Function SiUS04-924 Check Method 2  , TEMP  , MODE) simultaneously to enter the diagnosis mode. 1. Press the 3 buttons (TEMP (R8381) The left-side numeral blinks. (R9430)  or  button and change the figure until you hear the sound of “beep”. 2.
  • Page 78 SiUS04-924 Service Check Function 5. Press the TEMP button.  or  button  and change the figure until you hear the long sound of “beep”. Press TEMP (R8383) 6. Diagnose by the sound. beep : The left-side numeral is incorrect; move to the next number. beep-beep: The left-side numeral is incorrect but the right-side numeral is correct.

  • Page 79: Troubleshooting

    Troubleshooting SiUS04-924 4. Troubleshooting Error Codes and Description Reference Code Indication Description Page System — Normal U0 Insufficient gas Low-voltage detection or over-voltage detection Signal transmission error (between indoor and outdoor units) Unspecified voltage (between indoor and outdoor unit) Indoor Indoor unit PCB abnormality Unit Freeze-up protection control or high pressure control...

  • Page 80: Indoor Unit Pcb Abnormality

    SiUS04-924 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  Faulty indoor unit PCB Supposed ...

  • Page 81: Freeze-Up Protection Control Or High Pressure Control

    Troubleshooting SiUS04-924 Freeze-up Protection Control or High Pressure Control Remote Controller Display  High pressure control (heat pump model only) Method of 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 ...
  • Page 82 SiUS04-924 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occurr. Check No.06 Check the air passage. Refer to P.108 Provide sufficient air passage. Is there any short-circuit? Check the intake air filter.

  • Page 83: Fan Motor (Dc Motor) Or Related Abnormality

    Troubleshooting SiUS04-924 Fan Motor (DC Motor) or Related Abnormality Remote Controller Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation. Detection Malfunction When the detected rotation speed does not reach the demanded rotation speed of the target tap, Decision and is less than 50% of the maximum fan motor rotation speed.
  • Page 84 SiUS04-924 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Turn off the power supply Check No.01 and rotate the fan by hand. Refer to P.106 Does the fan Replace the fan rotate smoothly? motor.

  • Page 85: Thermistor Or Related Abnormality (Indoor Unit)

    Troubleshooting SiUS04-924 Thermistor or Related Abnormality (Indoor Unit) C4, C9 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 86: Signal Transmission Error (Between Indoor And Outdoor Unit)

    SiUS04-924 Troubleshooting Signal Transmission Error (between Indoor and Outdoor Unit) Remote Controller Display Method of The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked Malfunction whether it is normal. Detection Malfunction When the data sent from the outdoor unit cannot be received normally, or when the content of the Decision data is abnormal.

  • Page 87: Unspecified Voltage (Between Indoor And Outdoor Units)

    Troubleshooting SiUS04-924 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 Malfunction indoor / outdoor transmission signal. Detection Malfunction The pair type and multi type are interconnected. Decision Conditions ...

  • Page 88: Outdoor Unit Pcb Abnormality

    SiUS04-924 Troubleshooting Outdoor Unit PCB Abnormality Remote Controller Display  Detect within the program of the microcomputer that the program is in normal running order. Method of Malfunction Detection  When the program of the microcomputer is in abnormal running order. Malfunction Decision Conditions...

  • Page 89: Ol Activation (Compressor Overload)

    Troubleshooting SiUS04-924 OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection  If the compressor OL is activated twice, the system will be shut down. Malfunction  The error counter will reset itself if this or any other error does not occur during the following 60- Decision minute compressor running time (total time).

  • Page 90: Compressor Lock

    SiUS04-924 Troubleshooting 4.10 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the compressor running condition through the position Malfunction detection circuit. Detection  Judging from current waveform generated when applying high-frequency voltage to the motor. Malfunction ...

  • Page 91: Dc Fan Lock

    Troubleshooting SiUS04-924 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 Malfunction by the Hall IC. Detection  The fan does not start in 30 seconds even when the fan motor is running. Malfunction ...

  • Page 92: Input Overcurrent Detection

    SiUS04-924 Troubleshooting 4.12 Input Overcurrent Detection Remote Controller Display Method of An input overcurrent is detected by checking the input current value being detected by CT with the Malfunction compressor running. Detection  The following CT input with the compressor running continues for 2.5 seconds. Malfunction Decision CT input : Above 20 A...

  • Page 93: Four-Way Valve Abnormality

    Troubleshooting SiUS04-924 4.13 Four-Way Valve Abnormality Remote Controller Display Method of The room temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor Malfunction temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode. Detection Malfunction A following condition continues over 1 minute after operating 10 minutes.
  • Page 94 SiUS04-924 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.05 Four-way valve coil disconnected (loose)? Refer to P.107 Correct. Check No.06 Harness out of Refer to P.108 connector? Reconnect.

  • Page 95: Discharge Pipe Temperature Control

    Troubleshooting SiUS04-924 4.14 Discharge Pipe Temperature Control Remote Controller Display Method of The discharge pipe temperature control (stop, frequency dropping, etc.) is checked with the Malfunction temperature being detected by the discharge pipe thermistor. Detection  If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the Malfunction Decision system will be shut down.

  • Page 96: High Pressure Control In Cooling

    SiUS04-924 Troubleshooting 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 Malfunction temperature being sensed by the heat exchanger thermistor exceeds the limit. Detection ...

  • Page 97: Compressor System Sensor Abnormality

    Troubleshooting SiUS04-924 4.16 Compressor System Sensor Abnormality Remote Controller Display  Fault condition is identified by the supply voltage and the DC voltage which is detected before Method of the compressor startup. Malfunction  Fault condition is identified by compressor current which is detected right after the compressor Detection startup.

  • Page 98: Position Sensor Abnormality

    SiUS04-924 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 Malfunction position detection circuit. Detection  The compressor fails to start in about 15 seconds after the compressor run command signal is Malfunction Decision sent.
  • Page 99 Troubleshooting SiUS04-924 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.13 Refer to P.111 Check the supply voltage. Voltage as rated? Correct the power supply. Check No. 13 Check for short-circuit.

  • Page 100: Ct Or Related Abnormality

    SiUS04-924 Troubleshooting 4.18 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 Malfunction input current. Detection Malfunction The compressor running frequency is below 32 Hz. Decision (The input current is also below 0.5 A.) ...
  • Page 101 Troubleshooting SiUS04-924 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.12 Turn off the power and turn it on Refer to P.111 again. Get the system started. * Running current as shown at right Replace the outdoor unit...

  • Page 102: Thermistor Or Related Abnormality (Outdoor Unit)

    SiUS04-924 Troubleshooting 4.19 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. Malfunction [A thermistor error is detected by checking the temperature.] Detection Malfunction The thermistor input is above 4.96 V or below 0.04 V with the power on.
  • Page 103 Troubleshooting SiUS04-924 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.06 Turn on the power again. Refer to P.108 Error displayed again on remote controller? Reconnect. Connector or thermistor disconnected? Reconnect.

  • Page 104: Electrical Box Temperature Rise

    SiUS04-924 Troubleshooting 4.20 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor off. Detection Malfunction With the compressor off, the radiation fin temperature is above 212°F(100°C). (Reset is made when Decision the temperature drops below 158°F(70°C).) Conditions...

  • Page 105: Radiation Fin Temperature Rise

    Troubleshooting SiUS04-924 4.21 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor on. Detection  The radiation fin temperature with the compressor on is above 221°F(105°C). Malfunction ...
  • Page 106 SiUS04-924 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.07 Turn off the power and turn it on Refer to P.109 again to get the system started. Error displayed Has PCB been Check No.09...

  • Page 107: Output Overcurrent Detection

    Troubleshooting SiUS04-924 4.22 Output Overcurrent Detection Remote Controller Display Method of An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Detection  A position signal error occurs while the compressor is running. Malfunction ...
  • Page 108 SiUS04-924 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. * An output overcurrent may result from wrong internal wiring. If the wires have been disconnected and Check No.07 reconnected for parts replacements, for example, and the system is interrupted by an output overcurrent, Refer to P.109...

  • Page 109: Insufficient Gas

    Troubleshooting SiUS04-924 4.23 Insufficient Gas Remote Controller Display Method of Gas shortage detection I : Malfunction A gas shortage is detected by checking the CT-detected input current value and the 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 110 SiUS04-924 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.04 Refer to P.106 Any thermistor disconnected? Replace in position. * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor Check No.06 * Outdoor air thermistor...

  • Page 111: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting SiUS04-924 4.24 Low-voltage Detection or Over-voltage Detection Remote Controller Display Method of An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage Malfunction detection circuit. Detection  An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or the Malfunction Decision voltage being detected by the DC voltage detection circuit is judged to be below 150 V for 0.1...

  • Page 112: Signal Transmission Error On Outdoor Unit Pcb

    SiUS04-924 Troubleshooting 4.25 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  When the data sent from the PM1 can not be received successively for 9 seconds. Malfunction ...

  • Page 113: Check

    Check SiUS04-924 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 114 SiUS04-924 Check 5.1.3 Four-Way Valve Performance Check Check No.05 Turn off the power and turn it on again. * Four-way valve coil Start the heating-mode run. Cooling / dry : No continuity Heating : Continuity S80 voltage at with compressor on? Replace the outdoor unit PCB.

  • Page 115: Thermistor Resistance Check

    Check SiUS04-924 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 116: Installation Condition Check

    SiUS04-924 Check 5.1.5 Installation Condition Check Check No.07 Installation condition check Check the allowable dimensions Abnormal of the air suction and Change the position of the air discharge area. discharge grille or the installation location. Normal Does the discharged air from other outdoor unit cause an Change the position of the air increase of the suction air...

  • Page 117: Power Supply Waveforms Check

    Check SiUS04-924 5.1.7 Outdoor Unit Fan System Check (With DC Motor) Check No.09 Check the outdoor unit fan system. Fan motor lead wire connector Outdoor unit fan running? Reconnect. disconnected? Outdoor unit fan system Go to Check No. 15. functioning. (R7159) 5.1.8 Power Supply Waveforms Check Check No.10...

  • Page 118: Capacitor Voltage Check

    SiUS04-924 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 119: Turning Speed Pulse Input On The Outdoor Unit Pcb Check

    Check SiUS04-924 5.1.12 Turning Speed Pulse Input on the Outdoor Unit PCB Check Check No.15 <Propeller fan motor> Make sure the voltage of DC 325±50V is being applied. (1) Stop the operation first, turn the power off, and disconnect the connector S70. (2) Make sure there is about DC 325 V between pins 4 and 7.

  • Page 120: Removal Procedure

    SiUS04-924 Part 7 Removal Procedure 1. Indoor Unit....................114 1.1 Removal of Air Filter / Front Panel ............114 1.2 Removal of Front Grille ................117 1.3 Removal of Electrical Box ................ 120 1.4 Removal of PCB..................127 1.5 Removal of Horizontal Blades (Louvers) / Vertical blades (Fins) / Swing Mo- tors135 1.6 Removal of Fan Motor................

  • Page 121: Indoor Unit

    SiUS04-924 Indoor Unit 1. Indoor Unit Removal of Air Filter / Front Panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step 1. External appearance (R9473) Operation lamp Signal receiver Timer lamp ...
  • Page 122 Indoor Unit SiUS04-924 Step Procedure Points 3. Removal of the Titanium apatite photocatalytic air- purifying filter.  The 3 filters are Remove the Titanium interchangeable. apatite photocatalytic Air filter air-purifying filter frame by unfastening the projections from the back of the air filter frame.
  • Page 123 SiUS04-924 Indoor Unit Step Procedure Points 4. Removal of the front panel. While opening the front panel further than it Front Panel stops, release both axes and remove the front panel. (R9479)  Slide the front panel side to side to release each axis. ...

  • Page 124: Removal Of Front Grille

    Indoor Unit SiUS04-924 Removal of Front Grille Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step 1. Removal of the service cover. Remove the screw and remove the service cover.
  • Page 125 SiUS04-924 Indoor Unit Step Procedure Points  Refer to the removal Release the 4 hooks on the top of the front grille. procedure in a reverse way Hook when reassembling. (R9486) Remove the 3 fixing Hook (R9487) screws. (R9488) Removal Procedure...
  • Page 126 Indoor Unit SiUS04-924 Step Procedure Points  The Illustration shows the left Remove the 3 front grille fixtures. fixture. Front grille fixture (R9489) (R9490)  Make sure that all the hooks Pull the upper part of the front grille out and lift the are placed securely when lower part up, and then reassembling.

  • Page 127: Removal Of Electrical Box

    SiUS04-924 Indoor Unit Removal of Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step 1. Removal of the front grille.  Parts layout Parts layout (R9493) 2.
  • Page 128 Indoor Unit SiUS04-924 Step Procedure Points 3. Disconnect the indoor heat exchanger thermistor and the ground. Remove the screw and release the ground. Ground (R9497)  Be careful not to lose the clip Pull out the indoor heat exchanger thermistor. for the thermistor.
  • Page 129 SiUS04-924 Indoor Unit Step Procedure Points  You can remove the electrical 4. Removal of the electrical box. box without detaching the terminal strip board. Disconnect the 4 Terminal strip board connection wirings. Remove the screw and remove the wire retainer.
  • Page 130 Indoor Unit SiUS04-924 Step Procedure Points Disconnect the connector for swing motor [S41]. [S41] (R9502) Release the harness from the hooks. (R9503) Release the fixing screw ‘ Electrical box of the electrical box. (R9504) Removal Procedure...
  • Page 131 SiUS04-924 Indoor Unit Step Procedure Points  Fit the back hook of the Lift up the electrical box from the bottom to electrical box to the bottom remove. frame when reassembling. Bottom frame Hook (R9647) (R9505) Push the shelter up and undo the hooks.
  • Page 132 Indoor Unit SiUS04-924 Step Procedure Points Remove the shelter. (R9509) Internal layout. (R9510) Removal Procedure...
  • Page 133 SiUS04-924 Indoor Unit Step Procedure Points Remove the screw of the terminal strip board. (R9511) Remove the terminal strip board. (1 hook at the back) Terminal strip board (R9512) Removal Procedure...

  • Page 134: Removal Of Pcb

    Indoor Unit SiUS04-924 Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step 1. Removal the control PCB. Cut the clamp. Clamp (R9513)  When reassembling, make Release the harness from the hook.
  • Page 135 SiUS04-924 Indoor Unit Step Procedure Points Open the receiver unit. Remove the receiver unit by releasing the hook. (R9516) Release the 3 hooks. Lift up and remove the control PCB. Hook Hook (R9517) Pull out the ground wire. Earth (R9518) Removal Procedure...
  • Page 136 Indoor Unit SiUS04-924 Step Procedure Points Pull out the terminal strips. Terminal strips (R9519)  Refer to P.8 for detail. Control PCB [S1] To DC fan motor [S21] To centralized control (HA) [S25] To INTELLIGENT [S41] To swing motor [S46] To display PCB [S47] To signal receiver [S1] [S32]...
  • Page 137 SiUS04-924 Indoor Unit Step Procedure Points 2. Removal of the signal receiver PCB Release the hook on the right. (The signal receiver PCB will be lifted up.) Signal receiver PCB (R9520)  Remove the signal receiver Remove the signal receiver PCB. PCB as the upper hook centers.
  • Page 138 Indoor Unit SiUS04-924 Step Procedure Points 3. Removal of the INTELLIGENT EYE sensor. Release the 2 hooks on the right. Remove the INTELLIGENT EYE sensor as the 2 hooks on the left come center. INTELLIGENT EYE sensor (R9523) (R9524)  When reassembling, set the Remove the sensor from the shield plate.
  • Page 139 SiUS04-924 Indoor Unit Step Procedure Points Remove the shield plate (rear) by releasing the 2 hooks. Hook INTELLIGENT EYE sensor PCB Shield plate (rear) (R9526) Disconnect the connector [S36]. [S36] (R9527) 4. Removal of the display Release the 4 hooks. Display PCB (R9528) Removal Procedure...
  • Page 140 Indoor Unit SiUS04-924 Step Procedure Points Lift up the display PCB. (R9529) Release the harness. (R9530) Removal Procedure...
  • Page 141 SiUS04-924 Indoor Unit Step Procedure Points Disconnect the connector. [S49] : To control PCB [S49] (R9531) [S49] (R9532) Removal Procedure...

  • Page 142: Removal Of Horizontal Blades (Louvers)/Vertical Blades(Fins)/Swing Motors

    Indoor Unit SiUS04-924 Removal of Horizontal Blades (Louvers) / Vertical blades (Fins) / Swing Motors Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points 1. Removal of the horizontal blades.
  • Page 143 SiUS04-924 Indoor Unit Step Procedure Points  Removing order Remove the horizontal  blades by releasing the (Right hook left  hook and the protrusion inner-right  protrusions. protrusion inner-left protrusion) right Horizontal blade (R9535) left (R9536) inner right (R9537) Removal Procedure...
  • Page 144 Indoor Unit SiUS04-924 Step Procedure Points inner left (R9538) (R9539) 2. Removal of the fan guards. Remove the sealing material (horizontal). (R9540) Remove the sealing material (vertical, 2 position). (R9541) Removal Procedure...
  • Page 145 SiUS04-924 Indoor Unit Step Procedure Points  Remove the center and right Remove the left air outlet assembly by air outlet assembly likewise. pushing the 2 hooks at the back. Air outlet ASSY (R9542) Hook (R9543) Remove the fan guards Fan guard by releasing the 4 lower hooks and the 2 upper...
  • Page 146 Indoor Unit SiUS04-924 Step Procedure Points 3. Removal of the horizontal swing motors. Release the interlock rod. Interlock rod (R9546) Pull out the drain hose, then the swing motors can be removed. Drain hose Swing motor (R9547) Remove the screw at the center.
  • Page 147 SiUS04-924 Indoor Unit Step Procedure Points Remove the 2 pivots. (R9549) Remove the stepping Swing motor (upper blade) motors. Swing motor (lower blade) (R9550)  When reassembling, set the Disconnect the connector to remove the swing motors in the correct swing motor.
  • Page 148 Indoor Unit SiUS04-924 Step Procedure Points Remove the interlock rod (2) with pliers. Interlock rod (2) (R9553) (R9554) Remove the interlock rod (1). Interlock rod (1) (R9555) Removal Procedure...
  • Page 149 SiUS04-924 Indoor Unit Step Procedure Points Remove the 2 screws. (R9556) Remove the swing motor for vertical blade. Swing motor for vertical blade (R9557) Disconnect the connector. (R9558) Removal Procedure...

  • Page 150: Removal Of Fan Motor

    Indoor Unit SiUS04-924 Removal of Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step  When the screw is loose Loosen the fixing screw of the fan motor from the enough, the rotor can be air outlet.
  • Page 151 SiUS04-924 Indoor Unit Step Procedure Points Remove the fan motor fixture by pushing the hook at the front. (R9561) (R9562) Release the harness from the hook, and remove the screw of the motor mounting plate. (R9563) Removal Procedure...
  • Page 152 Indoor Unit SiUS04-924 Step Procedure Points  Reassembling the fan motor Remove the motor mounting plate. When reassembling the fan rotor, provide as much as 0.2inch (5mm) of play between the side face of the rotor and the bottom frame. Side face of Motor mounting plate Side face of rotor...

  • Page 153: Removal Of Heat Exchanger

    SiUS04-924 Indoor Unit Removal of Heat Exchanger Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step 1. Disconnect the refrigerant Caution piping. If gas leaks, collect all Hold the indoor unit up refrigerant from the unit, then by a piece of wood etc.
  • Page 154 Indoor Unit SiUS04-924 Step Procedure Points 2. Removal of the piping fixture. Detach the indoor unit from the installation plate. (R9571) Push the piping fixture assembly to release the Piping fixture assembly piping fixture. (R9572) Piping fixture (R9573) Removal Procedure...
  • Page 155 SiUS04-924 Indoor Unit Step Procedure Points Remove the piping fixture. (R9574) 3. Removal of the heat exchanger.  At an angle of 10°~20° Widen the auxiliary piping to the extent of 10°~20°. (R9575) Remove the 2 screws on the left. (R9576) Removal Procedure...
  • Page 156 Indoor Unit SiUS04-924 Step Procedure Points Push the fixing hooks on the right side and release. (R9577) Lift up and remove the Caution heat exchanger. When removing or reinstalling heat exchanger, be sure to wear protective gloves or wrap the heat exchanger with cloths.

  • Page 157: Removal Of Fan Rotor

    SiUS04-924 Indoor Unit Removal of Fan Rotor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step 1. Remove the right side panel.  You can remove the fan rotor Remove the 2 screws.
  • Page 158 Indoor Unit SiUS04-924 Step Procedure Points Remove the fixing screw Fan rotor of the fan rotor. (R9648)  Reassembling the fan motor Remove the fan motor. When reassembling the fan rotor, provide as much as 0.2inch (5mm) of play between the side face of the rotor and the bottom frame.

  • Page 159: Outdoor Unit

    SiUS04-924 Outdoor Unit 2. Outdoor Unit Removal of Outer Panels Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points External appearance. (R9749)  The hooks are secured in the 1.
  • Page 160 Outdoor Unit SiUS04-924 Step Procedure Points 2. Removal of the top panel. Top panel Remove the 7 screws and remove the top panel. (R9750) (R9751) 3. Removal of the right side panel. Remove the 5 screws. Right side panel (R9752) Removal Procedure...
  • Page 161 SiUS04-924 Outdoor Unit Step Procedure Points Slide the panel downward to release 2 hooks on the back side. (R9688) Hooks Hook Holes Hook Holes (R9590) Remove the right side panel. (R9591) Removal Procedure...
  • Page 162 Outdoor Unit SiUS04-924 Step Procedure Points 4. Removal of the front panel Remove the 1 screw. Front panel (2) (R9753) Slide the panel downward to release the hook. (R9754) (R9755) Removal Procedure...
  • Page 163 SiUS04-924 Outdoor Unit Step Procedure Points  The insulation sheet is Remove the front panel (2). inserted between the front panel (2) and the electrical box. Insulation sheet (R9756)  Remove the discharge grille 5. Removal of the front panel and propeller fan first to remove the front panel (1).
  • Page 164 Outdoor Unit SiUS04-924 Step Procedure Points Pull the bottom of the discharge grille toward you. (R9758) Remove the propeller Fan fixing nut : M8 fan and the fixing nut. Propeller fan (R9598) Removal Procedure...
  • Page 165 SiUS04-924 Outdoor Unit Step Procedure Points Remove the 3 fixing screws on the partition plate. (R9599) Remove the 2 screws at the bottom left of the front. (R9600) Removal Procedure...
  • Page 166 Outdoor Unit SiUS04-924 Step Procedure Points Remove the screw at the bottom of the left side. (R9601) Remove the screw at the bottom of the back side. (R9602) Removal Procedure...
  • Page 167 SiUS04-924 Outdoor Unit Step Procedure Points The front panel (1) is provided with a hook on its front. Lift the front panel off position to remove it. Hook (R9603) Removal Procedure...
  • Page 168 Outdoor Unit SiUS04-924 Step Procedure Points  The insulation sheet is Remove the front panel (1). inserted between the front panel (1) and the partition plate. (R9604) 6. Removal of the rear panel Remove the 3 fixing screws on the partition plate (2).
  • Page 169 SiUS04-924 Outdoor Unit Step Procedure Points Lift up slightly and remove the partition plate (2). (R9760) Remove the 3 screws. (R9607) Remove the wire fixing plate. Wire fixing plate (R9608) Removal Procedure...
  • Page 170 Outdoor Unit SiUS04-924 Step Procedure Points Remove the 4 fixing screws on the partition plate. (R9609) Remove the fixing screw from the bottom frame. (R9610) Removal Procedure...
  • Page 171 SiUS04-924 Outdoor Unit Step Procedure Points Remove the fixing screw from the shut-off valve mounting plate. (R9612) Lift the panel upward to release the 2 hooks and remove it. (R9613) Removal Procedure...
  • Page 172 Outdoor Unit SiUS04-924 Step Procedure Points Push the hooks of the outdoor air thermistor from inner-side. (R9615) The outdoor air thermistor is now released. Outdoor air thermistor (R9616) Remove the rear panel. Rear panel (R9614) Removal Procedure...

  • Page 173: Removal Of The Electrical Box

    SiUS04-924 Outdoor Unit Removal of the Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points Remove the fixing screw from the shut-off valve mounting plate. (R9617) Remove the fixing screw on the partition plate.
  • Page 174 Outdoor Unit SiUS04-924 Step Procedure Points Disconnect the  When reassembling, insert connector for fan motor Ferrite core the clamp into the small [S70] and release the 2 hole. ferrite cores attached to the electrical box with clamp. Fixing position for electronic expansion valve coil [S70]...
  • Page 175 SiUS04-924 Outdoor Unit Step Procedure Points Release the OL wire harness and the compressor wire harness together from the partition. Clamp (R9623)  Detach the clamp. Pull out the clamp.  Just pull the push-mount type out of position. Clamp (R9624) Disconnect the relay connector of the OL and...
  • Page 176 Outdoor Unit SiUS04-924 Step Procedure Points Pull out the clamp of the  When reassembling, insert thermistor harness from the clamp into the small the bottom of the hole. electrical box. (R9626) Slide the electrical box leftward to release the hook on the right side of Electrical box the box.

  • Page 177: Removal Of Pcb

    SiUS04-924 Outdoor Unit Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step  Remove the electrical box before hand. Remove the cover. (R9611) Disconnect the connectors of the service monitor PCB for the control PCB [S52,...
  • Page 178 Outdoor Unit SiUS04-924 Step Procedure Points Remove the fixing screw of the cable way board and disconnect the ground wire. Earth wire Cable way board (R5282) Release the hook on the right. Open the cable way board. Disconnect the 1: Black harnesses.
  • Page 179 SiUS04-924 Outdoor Unit Step Procedure Points Disconnect the 2 harnesses for the reactor (HR1, HR2). Remove the 3 fixing screws for the main PCB. Release the 4 hooks. Lift up and remove the control PCB. Removal Procedure...

  • Page 180: Removal Of Fan Motor

    Outdoor Unit SiUS04-924 Removal of Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points Cut the clamps at 2 locations. (R9630) Remove the 2 screws at Be sure to remove the bottom the bottom first.

  • Page 181: Removal Of Coils / Thermistors

    SiUS04-924 Outdoor Unit Removal of Coils / Thermistors Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points 1. Removal of the electronic expansion valve coil Pull the electronic expansion valve coil out of position.
  • Page 182 Outdoor Unit SiUS04-924 Step Procedure Points Slightly open the sound blanket. Sound blanket (R9633) Remove the sound blanket (top upper). Sound blanket (top upper) (R9634) Remove the discharge pipe thermistor. Discharge pipe thermistor (R9635) Removal Procedure...
  • Page 183 SiUS04-924 Outdoor Unit Step Procedure Points At the back side, open the outdoor air thermistor cover. Outdoor air thermistor cover (R9636) Release the outdoor air thermistor. Outdoor air thermistor (R9637) 3. Removal of the four-way valve coil Remove the screw. (R9638) Remove the four-way valve coil.

  • Page 184: Removal Of Sound Blanket

    Outdoor Unit SiUS04-924 Removal of Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points Undo the 2 Velcro tapes the sound blanket, and open the sound blanket (outer sleeve).
  • Page 185 SiUS04-924 Outdoor Unit Step Procedure Points Remove the screw from the partition plate and open the plate slightly to the left for easy work. (R9642)  The sound blanket is fragile. Remove the sound blanket (outer sleeve). Be careful of the notches of the compressor mount (3 locations).
  • Page 186 Outdoor Unit SiUS04-924 Step Procedure Points Open the sound blanket (inner sleeve) and remove part of the muffler.  The sound blanket is fragile. Be careful of the notches of the compressor mount (3 locations). Sound blanket Compressor mount (inner sleeve) (R9644) Remove the sound blanket (outer sleeve).

  • Page 187: Removal Of Compressor

    SiUS04-924 Outdoor Unit Removal of Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points Remove the terminal cover. (R9650)  U:red, V:yellow, W:blue Pull out the 3 leads using long-nose pliers.
  • Page 188 Outdoor Unit SiUS04-924 Step Procedure Points Heat up the brazed part and withdraw the piping Caution with pliers. Be careful not to get yourself  Before working, make sure burned with the pipes and other parts that are heated by that the refrigerant circuit is the gas welding rod.

  • Page 189: Other Considerations

    SiUS04-924 Part 8 Other Considerations 1. Other Considerations ................183 1.1 Trial Operation from the Remote Controller ..........183 1.2 Jumper Settings ..................184 1.3 Application of Silicon Grease to the Power Transistor and Diode Bridge 185 Others...

  • Page 190: Other Considerations

    SiUS04-924 Other Considerations 1. Other Considerations Trial Operation from the Remote Controller 1.1.1 Trial Operation and Testing 1. Measure the supply voltage and make sure that it falls in the specified range. 2. Trial operation should be carried out in either cooling or heating mode. 3.

  • Page 191: Jumper Settings

    Other Considerations SiUS04-924 Jumper Settings 1.2.1 When 2 Units are Installed in 1 Room When 2 indoor units are installed in 1 room, the 2 wireless remote controllers can be set for different addresses. How to set the different addresses ...

  • Page 192: Application Of Silicon Grease To Athe Power Transistor And A Diode Bridge

    SiUS04-924 Other Considerations Application of Silicon Grease to the Power Transistor and Diode Bridge Applicable All outdoor units using inverter type compressor for room air conditioner. Models When the printed circuit board of an outdoor unit is replaced, it is required that silicon grease (*1) is applied to the heat radiation part (the contact point to the heat radiation fin) of the power transistor and diode bridge.

  • Page 193: Piping Diagrams

    SiUS04-924 Part 9 Appendix 1. Piping Diagrams..................188 2. Wiring Diagrams..................189 Appendix...

  • Page 194: Appendix

    SiUS04-924 Piping Diagrams 1. Piping Diagrams FTXS30/36HVJU INDOOR UNIT 5/16 CuT DISTRIBUTOR HEAT EXCHANGER THERMISTOR CROSS FLOW FAN ON HEAT EXCH. FIELD PIPING 3/8 CuT FAN MOTOR HEADER FIELD PIPING 5/8 CuT 1/2 CuT REFRIGERANT FLOW COOLING HEATING 4D062742 RXS30/36HVJU OUTDOOR UNIT HEAT EXCHANGER OUTDOOR TEMPERATURE...

  • Page 195: Wiring Diagrams

    Wiring Diagrams SiUS04-924 2. Wiring Diagrams FTXS30/36HVJU FIELD WIRING. PCB3 PCB1 LED1 RECTIFIER 3.15A LED2 OUTDOOR LED3 CAUTION TRANSMISSION NOTE THAT OPERATION WILL CIRCUIT / YLW RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN. t°...
  • Page 196 SiUS04-924 Index Numerics check no.13 ..............119 check no.15 ..............120 00 ................80 coils ................183 3-d airflow ..............19 comfort airflow mode ..........20 3-minute standby ..........29, 36 comfort airflow operation ..........59 compressor ...............189 compressor lock ............91 a1 ................81 compressor overload ..........90 a5 ................

  • Page 197: Index

    SiUS04-924 e8 .................93 h6 ................99 ea .................94 h8 ................101 f3 ................96 h9 ................103 f6 ................97 ha ................11 h0 .................98 hall ic ..............20, 84 h6 .................99 heat exchanger ..........155, 157 h8 ...............101 heat exchanger thermistor ........86, 183 h9 ...............103 high pressure control ..........82 j3 ................103 high pressure control in cooling ........97 j6 ................103...
  • Page 198 SiUS04-924 s25 ................11 s32 ................11 night set mode ............24 s40 ................13 s41 ................132 s41 ..............11, 132 ol activation ..............90 s46 ................11 on/off button on indoor unit ........29 s47 ................11 opening limit ............... 43 s48 ................11 operation lamp ............75 s49 ................11 outdoor air temperature thermistor ......
  • Page 199 SiUS04-924 turning speed pulse input on the outdoor unit pcb check u0 ................110 u2 ................112 u4 ................87 u7 ................113 ua ................88 unspecified voltage ............ 88 v1 ................11 varistor ............... 11 vertical blades ............144 voltage detection function ..........
  • Page 200 .........105 electronic expansion valve check ......114 phase steps ............... 20 electronic expansion valve control ......42 piping diagrams ftxs30hvju ............199 ftxs36hvju ............199 facility setting switch ...........47 rxs30hvju ............199 fan motor (dc motor) or related abnormality ....84 rxs36hvju ............

  • Page 201: Drawings & Flow Charts

    .......193 troubleshooting with the led indication .......75 turning speed pulse input on the outdoor unit pcb check unspecified voltage (between indoor and outdoor units) wiring diagrams ftxs30hvju ............200 ftxs36hvju ............200 rxs30hvju ............200 rxs36hvju ............200 Drawings & Flow Charts...
  • Page 202 AMERICAS 1645 Wallace Drive, Suite 110 Carrollton, TX75006 info@daikinac.com www.daikinac.com Specifications, designs and other content appearing in this brochure are current as of February 2010 but subject to change without notice. SiUS04-924 Printed in U.S.A. 02/2010 B AK...

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