Page 1 SiUS04 - 904 Inverter Pair Wall Mounted Type H-Series [Applied Models]  Inverter Pair : Heat Pump...
Page 2 SiUS04-904 Inverter Pair Wall Mounted Type H-Series  Heat Pump Indoor Unit FTXS09HVJU FTXS12HVJU FTXS15HVJU FTXS18HVJU FTXS24HVJU Outdoor Unit RXS09DAVJU RX09FAVJU RXS12DAVJU RX12FAVJU RXS15DVJU RX15FVJU RXS18DVJU RX18FVJU RXS24DVJU RX24FVJU Table of Contents...
Page 3: Table Of Contents
SiUS04-904 Safety Considerations..............vi Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ...............4 1. Specifications ..................... 5 1.1 SEER 16 Models ..................5 1.2 SEER 13 Models ..................8 Part 3 Printed Circuit Board Connector Wiring Diagram ..........11 1.
Page 4 SiUS04-904 3.2 Frequency Control..................36 3.3 Controls at Mode Changing / Start-up............38 3.4 Discharge Pipe Temperature Control............40 3.5 Input Current Control................. 40 3.6 Freeze-up Protection Control ..............41 3.7 Heating Peak-cut Control ................42 3.8 Fan Control....................42 3.9 Liquid Compression Protection Function 2..........
Page 5 SiUS04-904 4.4 Fan Motor or Related Abnormality ............102 4.5 Thermistor or Related Abnormality (Indoor Unit)........105 4.6 Signal Transmission Error (between Indoor and Outdoor Unit) ....106 4.7 OL Activation (Compressor Overload) ............ 108 4.8 Compressor Lock ..................109 4.9 DC Fan Lock ...................
Page 6 SiUS04-904 3.6 Removal of Compressor................221 3.7 Removal of PCB..................223 4. RXS15/18/24DVJU, RX15/18/24FVJU ..........226 4.1 Removal of Panels and Plates ..............226 4.2 Removal of Fan Motor / Outdoor Fan............231 4.3 Removal of PCB / Electrical Box ............. 235 4.4 Removal of the Reactor................
Page 7: Safety Considerations
Safety Considerations SiUS04-904 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 8 SiUS04-904 Safety Considerations electrical appliances as it may cause an electrical CAUTION shock or fire. • Do not repair the electrical components with wet • Use an exclusive power circuit for the equipment. hands. Working on the equipment with wet hands Insufficient circuit amperage capacity may cause an may cause an electrical shock.
Page 9 Safety Considerations SiUS04-904 viii Safety Considerations...
Page 10: List Of Functions
SiUS04-904 Part 1 List of Functions 1. Functions....................2 List of Functions...
Page 11: Functions
SiUS04-904 Functions 1. Functions SEER 16: Category Functions Category Functions   Basic Inverter (with Inverter Power Control) Health & Air Air-Purifying Filter — — Function Cleaning (°)14~ (°)14~ Operation Limit for Cooling (°FDB) Photocatalytic Deodorizing Filter — — Air-Purifying Filter with Photocatalytic ...
Page 12 Functions SiUS04-904 SEER 13 Functions: Category Functions Category Functions   Basic Inverter (with Inverter Power Control) Health & Air Air-Purifying Filter — — Function Cleaning Operation Limit for Cooling (°FDB) Photocatalytic Deodorizing Filter — — Air-Purifying Filter with Photocatalytic ...
Page 13: Specifications
SiUS04-904 Part 2 Specifications 1. Specifications ..................... 5 1.1 SEER 16 Models ..................5 1.2 SEER 13 Models ..................8 Specifications...
Page 14: Seer 16 Models
SiUS04-904 Specifications 1. Specifications SEER 16 Models 60Hz 230V Indoor Units FTXS09HVJU FTXS12HVJU Models RXS09DAVJU RXS12DAVJU Outdoor Units Cooling Heating Cooling Heating Capacity Btu/h 8,500 (4,400~9,500) 10,000 (4,400~11,000) 11,500 (4,800~12,000) 11,500 (4,800~13,000) Rated (Min.~Max.) Moisture Removal Pt/h — — Running Current (Rated) 4.13...
Page 15 Specifications SiUS04-904 60Hz 230V Indoor Units FTXS15HVJU FTXS18HVJU Model RXS15DVJU RXS18DVJU Outdoor Units Cooling Heating Cooling Heating Capacity Btu/h 15,000 (3,200~15,000) 18,000 (3,200~21,200) 18,000 (3,200~18,000) 21,600 (3,200~24,000) Rated (Min.~Max.) Moisture Removal Pt/h — — Running Current (Rated) 5.44 6.88 6.97 8.71 Power Consumption Rated (Min.~Max.) 1,230 (450~1,230)
Page 16 SiUS04-904 Specifications 60Hz 230V Indoor Units FTXS24HVJU Model RXS24DVJU Outdoor Units Cooling Heating Capacity Btu/h 22,000 (3,200~22,000) 24,000 (3,200~25,400) Rated (Min.~Max.) Moisture Removal Pt/h — Running Current (Rated) 10.30 11.30 Power Consumption Rated (Min.~Max.) 2,360 (450~2,360) 2,590 (450~3,320) Power Factor 97.7 97.9 EER (Rated)
Page 17: Seer 13 Models
Specifications SiUS04-904 SEER 13 Models 60Hz 230V Indoor Units FTXS09HVJU FTXS12HVJU Models RX09FAVJU RX12FAVJU Outdoor Units Cooling Heating Cooling Heating Capacity Btu/h 8,500 (5,100~8,500) 10,000 (5,100~10,000) 11,500 (5,500~11,500) 11,500 (5,500~11,500) Rated (Min.~Max.) Moisture Removal Pt/h — — Running Current (Rated) 4.56...
Page 18 SiUS04-904 Specifications 60Hz 230V Indoor Units FTXS15HVJU FTXS18HVJU Model RX15FVJU RX18FVJU Outdoor Units Cooling Heating Cooling Heating Capacity Btu/h 15,000 (6,800~15,000) 18,000 (6,800~21,200) 18,000 (6,800~18,000) 21,600 (6,800~24,000) Rated (Min.~Max.) Moisture Removal Pt/h — — Running Current (Rated) 6.01 7.58 7.67 9.58 Power Consumption Rated (Min.~Max.) 1,360 (450~1,360)
Page 19 Specifications SiUS04-904 60Hz 230V Indoor Units FTXS24HVJU Model RX24FVJU Outdoor Units Cooling Heating Capacity Btu/h 22,000 (7,500~22,000) 24,000 (7,500~25,400) Rated (Min.~Max.) Moisture Removal Pt/h — Running Current (Rated) 11.35 12.43 Power Consumption Rated (Min.~Max.) 2,600 (450~2,600) 2,850 (450~3,320) Power Factor 99.6 99.7 EER (Rated)
Page 20: Part
SiUS04-904 Part 3 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram........12 1.1 FTXS09/12HVJU..................12 1.2 FTXS15/18/24HVJU.................. 14 1.3 RXS09/12DAVJU, RX09/12FAVJU............16 1.4 RXS15/18/24DVJU, RX15/18/24FVJU............18 Printed Circuit Board Connector Wiring Diagram...
Page 21: Printed Circuit Board Connector Wiring Diagram
SiUS04-904 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram FTXS09/12HVJU Connectors PCB(1) (Control PCB) (indoor unit) PCB(2) (Signal Receiver PCB) 1) S1 Connector for fan motor 2) S6 Connector for swing motor (horizontal blades) 3) S7 Connector for fan motor (Hall IC) 4) S21 Connector for centralized control (HA)
Page 22: Printed Circuit Board Connector Wiring Diagram
Printed Circuit Board Connector Wiring Diagram SiUS04-904 PCB Detail PCB(1): Control PCB (indoor unit) PCB(2): Signal Receiver PCB Signal Receiver PCB Control PCB LED1 LED2 LED3 RTH1 LED A (R4011) PCB(3): INTELLIGENT EYE sensor PCB (R3321) Printed Circuit Board Connector Wiring Diagram...
Page 23: Ftxs15/18/24Hvju
SiUS04-904 Printed Circuit Board Connector Wiring Diagram FTXS15/18/24HVJU Connectors PCB(1) (Control PCB) (indoor unit) 1) S1 Connector for fan motor 2) S6 Connector for swing motor (horizontal louvers) 3) S8 Connector for swing motor (vertical fins) 4) S21 Connector for centralized control (HA) 5) S26 Connector for buzzer PCB 6) S28...
Page 24 Printed Circuit Board Connector Wiring Diagram SiUS04-904 PCB Detail PCB(1): Control PCB (indoor unit) LED A (R2860) PCB(2): Signal Receiver PCB PCB(3): Buzzer PCB (R2861) RTH1 (R2862) PCB(4): Display PCB PCB(5): INTELLIGENT EYE sensor PCB LED1 LED2 LED3 (R2863) (R2864) Printed Circuit Board Connector Wiring Diagram...
Page 25: Rxs09/12Davju, Rx09/12Favju
SiUS04-904 Printed Circuit Board Connector Wiring Diagram RXS09/12DAVJU, RX09/12FAVJU Connectors PCB(1)(Filter PCB) 1) S11 Connector for control PCB PCB(2)(Control PCB) (outdoor unit) 1) S10 Connector for filter PCB 2) S20 Connector for electronic expansion valve coil 3) S30 Connector for compressor motor 4) S40 Connector for overload protector 5) S70...
Page 26 Printed Circuit Board Connector Wiring Diagram SiUS04-904 PCB Detail PCB(1): Filter PCB FU3(20A) (R6969) PCB(2): Control PCB (outdoor unit) S40 LED A S90 FU2(3.15A) FU1(3.15A) (R6970) Printed Circuit Board Connector Wiring Diagram...
Page 27: Rxs15/18/24Dvju, Rx15/18/24Fvju
SiUS04-904 Printed Circuit Board Connector Wiring Diagram RXS15/18/24DVJU, RX15/18/24FVJU Connectors PCB(1)(Control PCB) (outdoor unit) 1) S10, AC2 Connector for terminal strip 2) S20 Connector for electronic expansion valve coil 3) S31, S32 Connector for SPM 4) S33, S71 Connector for MID 5) S40 Connector for overload protector 6) S51, S101...
Page 28 Printed Circuit Board Connector Wiring Diagram SiUS04-904 PCB Detail PCB(1): Control PCB (outdoor unit) FU2(3.15A) S101 (R6971) PCB(2): Power Supply PCB Service Monitor PCB FU1(30A) HAC1 LED A S102 (R5140) (R2866) Printed Circuit Board Connector Wiring Diagram...
Page 29 SiUS04-904 Printed Circuit Board Connector Wiring Diagram FU201 (3.15A) (R2868) CN11 CN14 (R2869) Printed Circuit Board Connector Wiring Diagram...
Page 30 Printed Circuit Board Connector Wiring Diagram SiUS04-904 Printed Circuit Board Connector Wiring Diagram...
Page 31: Function And Control
SiUS04-904 Part 4 Function and Control 1. Main Functions..................23 1.1 Frequency Principle................... 23 1.2 Power-Airflow Dual Louvers, Wide-Angle Fins and Auto-Swing ....24 1.3 Fan Speed Control for Indoor Units............25 1.4 Program Dry Function ................26 1.5 Automatic Operation.................. 27 1.6 Thermostat Control..................
Page 32 SiUS04-904 4.13 Malfunctions ....................59 4.14 Forced Operation Mode ................61 4.15 Additional Functions .................. 61 Function and Control...
Page 33: Main Functions
SiUS04-904 Main Functions 1. Main Functions Frequency Principle The compressor is frequency-controlled during normal operation. The target frequency is set by the Main Control following 2 parameters coming from the operating indoor unit: Parameters  The load condition of the operating indoor unit ...
Page 34: Power-Airflow Dual Louvers, Wide-Angle Fins And Auto-Swing
Main Functions SiUS04-904 The inverter provides the following features: Inverter 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) operation. This enables the setpoint to be reached quicker.
Page 35: Fan Speed Control For Indoor Units
SiUS04-904 Main Functions During cooling or dry mode, the louver retracts into the indoor unit, allowing cool air to blow across the whole room. Wide-Angle Fins The louvers, made of elastic synthetic resin, provide a wide range of airflow that guarantees a comfortable air distribution.
Page 36: Program Dry Function
Main Functions SiUS04-904 (R4085) (R4085) HH (POWERFUL) = Within this range the airflow rate is automatically controlled when the FAN setting button is set to automatic. 1. During POWERFUL operation, fan operate H tap + 50 - 90 rpm. Note: 2.
Page 37: Automatic Operation
SiUS04-904 Main Functions –  0.9ºF(0.5ºC) = 63ºF (17.2ºC) 63ºF(17.2ºC) –  64ºF (17.8ºC) 3.6ºF (2.0ºC)  0.9ºF(0.5ºC) Zone C = Thermostat ON Zone B Zone B + Δ0.90ºF (0.5ºC) Zone A = Thermostat OFF (R6972) 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.
Page 38: Thermostat Control
Main Functions SiUS04-904 Cooling Operation Set point + Δ4.5ºF(2.5ºC) Set point + Δ2.7ºF(1.5ºC) Set point – Δ3.6ºF(2.0ºC) =Thermostat OFF =Thermostat OFF Set point – Δ4.5ºF(2.5ºC) Heating Operation (R0271) Ex: When the set point is 77°F (25°C) Cooling Operation  73.4°F(23°C): Thermostat OFF 72°F(22°C): Switch to Heating Operation Heating Operation 79.7°F(26.5°C): Thermostat OFF ...
Page 39: Night Set Mode
SiUS04-904 Main Functions Heating Room temperature – set point Δ2.7°F (1.5°C) Δ0°F (R5466) 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 one hour, then automatically raises the temperature setting slightly in the case of cooling, or lowers Circuit...
Page 40: Intelligent Eye
Main Functions SiUS04-904 INTELLIGENT EYE This function detects movement in the room by a 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 exist.
Page 41: Home Leave Operation
SiUS04-904 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 42: Inverter Powerful Operation
Main Functions SiUS04-904 operation or when the powerful operation button is pressed. Others The set temperature and set air volume are memorized in the remote controller. When the remote controller is reset due to replacement of battery, it is necessary to set the temperature and air volume again for [HOME LEAVE].
Page 43: Other Functions
SiUS04-904 Main Functions Ex.) : POWERFUL operation in cooling mode. Target temp. Set temp. It should be the lower limit of cooling temperature. 64˚F POWERFUL ON It counts 20 min. also in the remote controller. POWERFUL OFF Ending condition: "or" in 1 to 3 90rpm 1.
Page 44 Main Functions SiUS04-904 1.11.4 Air-Purifying Filter with Photocatalytic Deodorizing Function This filter combines the Air Purifying Filter and Titanium Apatite Photocatalytic Deodorizing Filter in a single highly effective unit. The filter traps microscopic particles, decomposes odors and even deactivates bacteria and viruses. It lasts for 3 years without replacement if washed once every 6 months.
Page 45: Function Of Thermistor
SiUS04-904 Function of Thermistor 2. Function of Thermistor Electronic expansion valve Four way valve Compressor (R5204) A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe temperature. Exchanger The system sets a target discharge pipe temperature according to the outdoor and indoor heat Thermistor exchanger temperature, and controls the electronic expansion valve opening so that the target discharge pipe temperature can be obtained.
Page 46: Control Specification (09/12 Class)
Control Specification (09/12 Class) SiUS04-904 3. Control Specification (09/12 Class) Mode Hierarchy There are two modes; the mode selected by the user (normal air conditioning mode) and forced Outline operation mode for installing and servicing. Detail 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 47: Control Specification (09/12 Class)
SiUS04-904 Control Specification (09/12 Class) Detail How to Determine Frequency The compressor’s frequency is determined by taking the following steps: 1. Determine command frequency  Command frequency is determined in the following order of priority. 1.1 Limiting defrost control time 1.2 Forced cooling 1.3 Indoor frequency command 2.
Page 48: Controls At Mode Changing / Start-Up
Control Specification (09/12 Class) SiUS04-904 Indoor Frequency Command (D signal) The difference between the room temperature and the temperature set by the remote controller is taken as the “D signal” and is used for frequency command. D D D D Temperature Temperature Temperature...
Page 49 SiUS04-904 Control Specification (09/12 Class)  When the discharge pipe temperature is higher than 54ºF, inverter in open phase operation stops. 3.3.2 Four-Way Valve Switching Outline During the heating operation the valve must be energized, and during cooling and defrosting, current must not be energized.
Page 50: Discharge Pipe Temperature Control
Control Specification (09/12 Class) SiUS04-904 3.3.4 3-minute Standby Prohibits turning ON the compressor for 3 minutes after turning it off (except when defrosting). 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency must be set as follows. The function must not be used when defrosting (Hz) FCG 1...
Page 51: Freeze-Up Protection Control
SiUS04-904 Control Specification (09/12 Class) The frequency control is made within the following zones. Detail 2 Hz dropping 1.0 second after rushing in the dropping zone Input current Dropping zone dropping When a “stop current” continues for 2.5 seconds after rushing on the stop zone, the compressor operation stops.
Page 52: Heating Peak-Cut Control
Control Specification (09/12 Class) SiUS04-904 Heating Peak-cut Control During heating operation, the signals being sent from the indoor unit allow the operating frequency Outline limitation and prevent abnormal high pressure. The signal from the indoor unit must be divided as follows: Detail Conditions for Start Controlling...
Page 53: Defrost Control
SiUS04-904 Control Specification (09/12 Class) 3.10 Defrost Control Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat Outline exchanger temperature must be more than its fixed value when finishing. Detail Conditions for Starting Defrost Certain conditions must exist when starting the defrost operation.
Page 54: Electronic Expansion Valve Control
Control Specification (09/12 Class) SiUS04-904 3.11 Electronic Expansion Valve Control The following are control examples that function in each mode via the electronic expansion valve Outline control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2.
Page 55 SiUS04-904 Control Specification (09/12 Class) 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 56 Control Specification (09/12 Class) SiUS04-904 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 57: Malfunctions
SiUS04-904 Control Specification (09/12 Class) 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction may occur in the thermistor. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Fin thermistor 4. Outdoor 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, monitor the OL operation.
Page 58: Forced Operation Mode
Control Specification (09/12 Class) SiUS04-904 Detail I Judgment by power consumption When an output frequency is exceeds 55 Hz and the input current is less than specified value, the adjustment is made for refrigerant shortage. II Judgment by discharge pipe temperature When discharge pipe temperature is 36°F (20°C) higher than target value and the electronic expansion value opening is 450 pulses (max.), the adjustment is made for refrigerant shortage.
Page 59: Forced Operation Mode
SiUS04-904 Control Specification (15/18/24 Class) 4. Control Specification (15/18/24 Class) Mode Hierarchy There are two modes; the mode selected in the user’s place (normal air conditioning mode) and Outline forced operation mode for installation and providing service. Detail For heat pump model There are the following modes;...
Page 60: Frequency Control
Control Specification (15/18/24 Class) SiUS04-904 Frequency Control Frequency is determined according to the difference between room and set temperature. Outline The function is explained as follows. 1. How to determine frequency. 2. Frequency command from an indoor unit. (The difference between a room temperature and the temperature set by the remote controller.) 3.
Page 61 SiUS04-904 Control Specification (15/18/24 Class) Indoor Frequency Command (D signal) The difference between a room temperature and the temperature set by the remote controller is taken as the “D signal” and is used for frequency command. D D D D Temperature Temperature Temperature...
Page 62: Controls At Mode Changing / Start-Up
Control Specification (15/18/24 Class) SiUS04-904 Controls at Mode Changing / Start-up 4.3.1 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 ...
Page 63: Discharge Pipe Temperature Control
SiUS04-904 Control Specification (15/18/24 Class) Discharge Pipe Temperature Control The discharge pipe temperature is used as the compressor's internal temperature. If the discharge Outline pipe temperature rises above a certain level, the operating frequency upper limit is set to keep this temperature from going up higher.
Page 64: Freeze-Up Protection Control
Control Specification (15/18/24 Class) SiUS04-904 model). 2. In case the operation mode is heating  The current drops when outdoor air temperature becomes higher than a certain level (model by model). Freeze-up Protection Control During cooling operation, the signals being sent from the indoor unit allow the operating frequency Outline limitation and then prevent freezing of the indoor heat exchanger.
Page 65: Fan Control
SiUS04-904 Control Specification (15/18/24 Class) Fan Control Fan control is carried out according to the following conditions. Outline 1. Fan ON control for electric component cooling fan 2. Fan control when defrosting 3. Fan OFF delay when stopped 4. ON/OFF control in cooling operation 5.
Page 66: Defrost Control
Control Specification (15/18/24 Class) SiUS04-904 4.11 Defrost Control Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat Outline 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 67: Electronic Expansion Valve Control
SiUS04-904 Control Specification (15/18/24 Class) 4.12 Electronic Expansion Valve Control The following items are included in the electronic expansion valve control: Outline Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2.
Page 68 Control Specification (15/18/24 Class) SiUS04-904 4.12.1 Fully Closing with Power ON Initialize the electronic expansion valve when turning on the power, set the opening position and develop pressure equalizing. 4.12.2 Pressure Equalization Control When the compressor is stopped, open and close the electronic expansion valve and develop pressure equalization.
Page 69: Malfunctions
SiUS04-904 Control Specification (15/18/24 Class) 4.12.7 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 70 Control Specification (15/18/24 Class) SiUS04-904 4.13.3 Refrigerant Shortage Control If a power consumption is below the specified value in which the frequency is higher than the Outline specified frequency, it must be regarded as refrigerant shortage. In addition to such conventional function, if the discharge pipe temperature is higher than the target discharge pipe temperature, and the electronic expansion valve is fully open (450 pulses) more than the specified time, it is considered as refrigerant shortage.
Page 71: Forced Operation Mode
SiUS04-904 Control Specification (15/18/24 Class) 4.14 Forced Operation Mode Forced operating mode includes only forced cooling. Outline Detail Forced Cooling Item Forced Cooling Forced operation 1) The outdoor unit is not abnormal allowing conditions and not in the 3-minute standby mode. 2) The operating mode of the outdoor unit is the stop mode.
Page 72 Control Specification (15/18/24 Class) SiUS04-904 Function and Control...
Page 73: Part
SiUS04-904 Part 5 Operation Manual 1. System Configuration................63 2. FTXS09/12HVJU..................64 3. FTXS15/18/24HVJU................. 77 Operation Manual...
Page 74: System Configuration
SiUS04-904 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 75: Ftxs09/12Hvju
FTXS09/12HVJU SiUS04-904 2. FTXS09/12HVJU Displays the current settings. Changes the temperature setting. Selects the airflow rate setting. Operation Manual...
Page 76 SiUS04-904 FTXS09/12HVJU Selects the operation mode. AUTO/ DRY/ COOL/ HEAT/ FAN Cancels the timer setting. Changes the ON/OFF Operation Manual...
Page 77 FTXS09/12HVJU SiUS04-904 Operation Manual...
Page 78 SiUS04-904 FTXS09/12HVJU Operation Manual...
Page 79 FTXS09/12HVJU SiUS04-904 To adjust the louvers (horizontal blades) fins louvers begin to move. When the louvers have reached the desired position, fins The louvers stop moving. fins To adjust the fins (vertical blades) fins louvers movement range depends on the operation mode. Always use a remote controller to adjust the angles of the louvers.
Page 80 SiUS04-904 FTXS09/12HVJU human movement. displayed on the LCD. is no longer displayed on the LCD. With someone in the room With no one in the room Someone back in the room Operation Manual...
Page 81 FTXS09/12HVJU SiUS04-904 center) Do not hit or forcefully push the INTELLIGENT EYE sensor as it can cause damage and malfunction. Operation Manual...
Page 82 SiUS04-904 FTXS09/12HVJU is no longer displayed on the LCD. is no longer displayed on the LCD. Operation Manual...
Page 83 FTXS09/12HVJU SiUS04-904 is no longer displayed on the LCD. Operation Manual...
Page 84 SiUS04-904 FTXS09/12HVJU is no longer displayed on the LCD. Operation Manual...
Page 85 FTXS09/12HVJU SiUS04-904 Operation Manual...
Page 86 SiUS04-904 FTXS09/12HVJU Operation Manual...
Page 87 FTXS09/12HVJU SiUS04-904 3P232717-1C Operation Manual...
Page 88: Ftxs15/18/24Hvju
SiUS04-904 FTXS15/18/24HVJU 3. FTXS15/18/24HVJU Displays the current settings. Changes the temperature setting. Selects the airflow rate setting. Operation Manual...
Page 89 FTXS15/18/24HVJU SiUS04-904 Selects the operation mode. AUTO / DRY/ COOL/ HEAT /FAN Cancels the timer setting. Changes the ON/OFF Operation Manual...
Page 90 SiUS04-904 FTXS15/18/24HVJU is no longer displayed on the LCD. Operation Manual...
Page 91 FTXS15/18/24HVJU SiUS04-904 Operation Manual...
Page 92 SiUS04-904 FTXS15/18/24HVJU louvers (horizontal blades) the louvers move. When the louvers have reached the desired position, The louvers stop moving. fins is no longer displayed on the LCD. To adjust the fins (vertical blades) When the fins have reached the desired The fins stop moving.
Page 93 FTXS15/18/24HVJU SiUS04-904 louvers and fins move in turn. Notes on louver and fin angles. When the SWING button is selected, the louver swinging range depends on the operation mode. (See figure.) louvers and fins. Always use a remote controller to adjust the louver angles. Inside the air outlet, a fan is rotating at a high speed.
Page 94 SiUS04-904 FTXS15/18/24HVJU is no longer displayed on the LCD. Operation Manual...
Page 95 FTXS15/18/24HVJU SiUS04-904 operation Do not hit or forcefully push the Operation Manual...
Page 96 SiUS04-904 FTXS15/18/24HVJU is no longer displayed on the LCD. Operation Manual...
Page 97 FTXS15/18/24HVJU SiUS04-904 is no longer displayed on the LCD. Operation Manual...
Page 98 SiUS04-904 FTXS15/18/24HVJU is no longer displayed on the LCD. Operation Manual...
Page 99 FTXS15/18/24HVJU SiUS04-904 Operation Manual...
Page 100 SiUS04-904 FTXS15/18/24HVJU Operation Manual...
Page 101 FTXS15/18/24HVJU SiUS04-904 3P232717-2C Operation Manual...
Page 102: Service Diagnosis
SiUS04-904 Part 6 Service Diagnosis 1. Caution for Diagnosis................92 2. Problem Symptoms and Measures ............94 3. Service Check Function ................95 4. Troubleshooting ..................98 4.1 Error Codes and Description ..............98 4.2 Indoor Unit PCB Abnormality ..............99 4.3 Freeze-up Protection Control or High Pressure Control......
Page 103: Caution For Diagnosis
SiUS04-904 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 104 Caution for Diagnosis SiUS04-904 Troubleshooting The outdoor unit has one green LED (LED A) on the PCB. The flashing green LED indicates normal condition of microcomputer operation. with LED Indication  15/18/24 Class Service Diagnosis...
Page 105: Problem Symptoms And Measures
SiUS04-904 Problem Symptoms and Measures 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 106: Service Check Function
Service Check Function SiUS04-904 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. TIMER CANCEL button <Open the front cover> < >...
Page 107 SiUS04-904 Service Check Function Check Method 2  , TEMP  , MODE) simultaneously to enter the diagnosis mode. 1. Press the 3 buttons (TEMP (R8381) The left-side numeral blinks.  or  button and change the figure until you hear the long beep. 2.
Page 108 Service Check Function SiUS04-904 5. Press the TEMP button.  or  button  and change the figure until you hear the long beep. Press TEMP (R8383) 6. Diagnose by the sound. beep: The left-side numeral is incorrect; move to the next number. beep-beep: The right-side number is incorrect;...
Page 109: Troubleshooting
SiUS04-904 Troubleshooting 4. Troubleshooting Error Codes and Description Reference Page Code Description 09/12 15/18/24 Indication Class Class System Normal — — U0 Refrigerant shortage Over-voltage detection — Low-voltage detection — Signal transmission error (between indoor and outdoor unit) Indoor Indoor unit PCB abnormality Unit Freeze-up protection control or high pressure control...
Page 110: Indoor Unit Pcb Abnormality
Troubleshooting SiUS04-904 Indoor Unit PCB Abnormality Remote Controller Display Evaluation of zero-cross detection of power supply by indoor unit. Method of Malfunction Detection Malfunction When there is no zero-cross detection in approximately 10 continuous seconds. Decision Conditions  Faulty indoor unit PCB Supposed ...
Page 111: Freeze-Up Protection Control Or High Pressure Control
SiUS04-904 Troubleshooting Freeze-up Protection Control or High Pressure Control Remote Controller Display  High pressure control Method of During heating operations, the temperature detected by the indoor heat exchanger thermistor is Malfunction used for the high pressure control (stop, outdoor fan stop, etc.) Detection ...
Page 112 Troubleshooting SiUS04-904 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.06 Check the air passage. Refer to P.146 Is there any short-circuit? Provide sufficient air passage. Check the intake air filter.
Page 113: Fan Motor Or Related Abnormality
SiUS04-904 Troubleshooting Fan Motor or Related Abnormality 4.4.1 AC Motor 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 114 Troubleshooting SiUS04-904 4.4.2 DC Motor Remote Controller Display The rotation speed detected by the Hall IC during fan motor operation is used to determine Method of 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 115 SiUS04-904 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.01 Turn off the power supply Refer to P.144 and rotate the fan by hand. Does the fan Replace the fan rotate smoothly? motor.
Page 116: Thermistor Or Related Abnormality (Indoor Unit)
Troubleshooting SiUS04-904 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 117: Signal Transmission Error (Between Indoor And Outdoor Unit)
SiUS04-904 Troubleshooting Signal Transmission Error (between Indoor and Outdoor Unit) Remote Controller Display The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked Method of whether it is normal. Malfunction Detection Malfunction When the data sent from the outdoor unit cannot be received normally, or when the content of the data is abnormal.
Page 118 Troubleshooting SiUS04-904 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.10 Check the indoor unit-outdoor unit Refer to P.148 connection wires. Is there any wiring Correct the indoor unit-outdoor error? unit connection wires.
Page 119: Ol Activation (Compressor Overload)
SiUS04-904 Troubleshooting OL Activation (Compressor Overload) Remote Controller Display A compressor overload is detected through compressor OL. Method of Malfunction Detection  If the compressor OL is activated twice, the system is shut down. Malfunction  The error counter is reset if this or any other error does not occur during the following 60-minute Decision compressor running time (total time).
Page 120: Compressor Lock
Troubleshooting SiUS04-904 Compressor Lock 4.8.1 09/12 Class Remote Controller Display A compressor lock is detected by checking the compressor running condition through the position Method of detection circuit. Malfunction Detection  The system judges the compressor lock, and stops due to overcurrent. Malfunction ...
Page 121 SiUS04-904 Troubleshooting 4.8.2 15/18/24 Class Remote Controller Display A compressor lock is detected by checking the compressor running condition through the position Method of detection circuit. Malfunction Detection  The position detection circuit detects a compressor frequency of below 10 Hz for 20 seconds or Malfunction a frequency of above 160 Hz.
Page 122: Dc Fan Lock
Troubleshooting SiUS04-904 DC Fan Lock Remote Controller Display A fan motor or related error is detected by checking the high-voltage fan motor rpm being detected Method of by the Hall IC. Malfunction Detection  The fan does not start in 30 seconds even when the fan motor is running. Malfunction ...
Page 123: Input Overcurrent Detection
SiUS04-904 Troubleshooting 4.10 Input Overcurrent Detection 4.10.1 09/12 Class Remote Controller Display An input overcurrent is detected by checking the input current value with the compressor running. Method of Malfunction Detection  The following current with the compressor running continues for 2.5 seconds. Malfunction Cooling ·...
Page 124 Troubleshooting SiUS04-904 4.10.2 15/18/24 Class Remote Controller Display An input overcurrent is detected by checking the input current value being detected by CT with the Method of compressor running. Malfunction Detection  The following CT input with the compressor running continues for 2.5 seconds. Malfunction CT input : Above 20 A Decision...
Page 125 SiUS04-904 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 * An input overcurrent may result from incorrect internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input overcurrent, Refer to P.147 check the wires again.
Page 126: Four-Way Valve Abnormality
Troubleshooting SiUS04-904 4.11 Four-Way Valve Abnormality 4.11.1 09/12 Class Remote Controller Display The indoor air temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor Method of temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they Malfunction function within their normal ranges in the operating mode.
Page 127 SiUS04-904 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 Refer to P.145 Four-way valve coil disconnected (loose)? Correct. Check No.06 Refer to P.146 Harness out of connector? Reconnect.
Page 128 Troubleshooting SiUS04-904 4.11.2 15/18/24 Class Remote Controller Display The room temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor Method of temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they Malfunction function within their normal ranges in the operating mode. Detection Malfunction A following condition continues over 1 minute after operating 10 minutes.
Page 129 SiUS04-904 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 Refer to P.145 coil disconnected (loose)? Correct. Check No.06 Refer to P.146 Harness out of connector? Reconnect.
Page 130: Discharge Pipe Temperature Control
Troubleshooting SiUS04-904 4.12 Discharge Pipe Temperature Control 4.12.1 09/12 Class Remote Controller Display The discharge pipe temperature control (stop, frequency dropping, etc.) is checked with the Method of temperature being detected by the discharge pipe thermistor. Malfunction Detection  If a stop takes place 4 times successively due to abnormal discharge pipe temperature, the Malfunction system is shut down.
Page 131 SiUS04-904 Troubleshooting 4.12.2 15/18/24 Class Remote Controller Display The discharge pipe temperature control (stop, frequency dropping, etc.) is checked with the Method of temperature being detected by the discharge pipe thermistor. Malfunction Detection  If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the Malfunction system is shut down.
Page 132: High Pressure Control In Cooling
Troubleshooting SiUS04-904 4.13 High Pressure Control in Cooling Remote Controller Display High-pressure control (stop, frequency drop, etc.) is activated in the cooling mode if the Method of temperature being sensed by the heat exchanger thermistor exceeds the limit. Malfunction Detection Malfunction Activated when the temperature being sensed by the heat exchanger thermistor rises above °F.
Page 133 SiUS04-904 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.144 Check the installation space. Check No.06 Check No. 07 Abnormal Check the installation Refer to P.146 Change the air outlet grille condition.
Page 134: Position Sensor Abnormality
Troubleshooting SiUS04-904 4.14 Position Sensor Abnormality 4.14.1 09/12 Class Remote Controller Display A compressor startup failure is detected by checking the compressor running condition through the Method of position detection circuit. Malfunction Detection  The compressor fails to start in about 15 seconds after the compressor run command signal is Malfunction sent.
Page 135 SiUS04-904 Troubleshooting 4.14.2 15/18/24 Class Remote Controller Display A compressor startup failure is detected by checking the compressor running condition through the Method of position detection circuit. Malfunction Detection  The compressor fails to start in about 15 seconds after the compressor run command signal is Malfunction sent.
Page 136: Dc Voltage / Current Sensor Abnormality
Troubleshooting SiUS04-904 4.15 DC Voltage / Current Sensor Abnormality Remote Controller Display Detecting abnormality of the DC sensor by the running frequency of compressor and by the input Method of current multiplied DC voltage and current. Malfunction Detection Malfunction The compressor running frequency is below 52 Hz. (The input current is also below 0.5 A.) Decision ...
Page 137: Ct Or Related Abnormality
SiUS04-904 Troubleshooting 4.16 CT or Related Abnormality Remote Controller Display A CT or related error is detected by checking the compressor running frequency and CT-detected Method of input current. Malfunction Detection Malfunction The compressor running frequency is below 55 Hz and the CT input is below 0.1 V. (The input current is also below 1.25 A.) Decision ...
Page 138 Troubleshooting SiUS04-904 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.156 again. Get the system started. * Running current as shown at right Replace the outdoor unit...
Page 139: Thermistor Or Related Abnormality (Outdoor Unit)
SiUS04-904 Troubleshooting 4.17 Thermistor or Related Abnormality (Outdoor Unit) P4, J3, J6, H9 Remote Controller Display This type of error is detected by checking the thermistor input voltage to the microcomputer. Method of [A thermistor error is detected by checking the temperature.] Malfunction Detection Malfunction...
Page 140 Troubleshooting SiUS04-904 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.146 Error displayed again on remote controller? Reconnect. Connector or thermistor disconnected? Reconnect.
Page 141: Electrical Box Temperature Rise
SiUS04-904 Troubleshooting 4.18 Electrical Box Temperature Rise Remote Controller Display An electrical box temperature rise is detected by checking the radiation fin thermistor with the Method of compressor off. Malfunction Detection Malfunction With the compressor off, the radiation fin temperature is above 176°F (80°C). Reset is made when the temperature drops below 158°F (70°C).
Page 142 Troubleshooting SiUS04-904 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.06 WARNING Refer to P.146 Turn off the power and turn it on again. To cool down the electricals, the outdoor unit fan gets started when the radiation fin temperature rises above 176°F (80°C) and stops itself...
Page 143: Radiation Fin Temperature Rise
SiUS04-904 Troubleshooting 4.19 Radiation Fin Temperature Rise Remote Controller Display A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Method of compressor on. Malfunction Detection Malfunction If the radiation fin temperature with the compressor on is above 194°F (90°C). ...
Page 144 Troubleshooting SiUS04-904 Troubleshooting Check No.06 Be sure to turn off the power switch before connecting or disconnecting Refer to P.146 Caution the connector, or parts damage may occur. Turn off the power and turn it on again. Check No.07 Refer to P.147 Error again or Has PCB been Check No.09...
Page 145: Output Overcurrent Detection
SiUS04-904 Troubleshooting 4.20 Output Overcurrent Detection 4.20.1 09/12 Class Remote Controller Display An output overcurrent is detected by checking the current that flows in the inverter DC section. Method of Malfunction Detection  A position signal error occurs while the compressor is running. Malfunction ...
Page 146 Troubleshooting SiUS04-904 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 incorrect internal wiring. If the wires have been disconnected and Check No.07 reconnected for part replacement, for example, and the system is interrupted by an output overcurrent, check the wires again.
Page 147 SiUS04-904 Troubleshooting 4.20.2 15/18/24 Class Remote Controller Display An output overcurrent is detected by checking the current that flows in the inverter DC section. Method of Malfunction Detection  A position signal error occurs while the compressor is running. Malfunction ...
Page 148 Troubleshooting SiUS04-904 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.07 * An output overcurrent may result from incorrect internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an output overcurrent, Refer to P.147 check the wires again.
Page 149: Refrigerant Shortage
SiUS04-904 Troubleshooting 4.21 Refrigerant Shortage 4.21.1 09/12 Class Remote Controller Display Method of Refrigerant shortage detection I : Refrigerant shortage is detected by checking the compressor running frequency. Malfunction Detection Refrigerant shortage detection II : Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of the electronic expansion valve.
Page 150 Troubleshooting SiUS04-904 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.144 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 151 SiUS04-904 Troubleshooting 4.21.2 15/18/24 Class Remote Controller Display Method of Refrigerant shortage detection I : Refrigerant shortage is detected by checking the CT-detected input current value and the Malfunction compressor running frequency. Detection Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of the electronic expansion valve.
Page 152 Troubleshooting SiUS04-904 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Refer to P.144 Any thermistor Replace in position. disconnected? * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor Check No.06 * Outdoor air thermistor...
Page 153: Over-Voltage Detection
SiUS04-904 Troubleshooting 4.22 Over-voltage Detection Remote Controller Display An abnormal voltage rise is detected by checking the specified over-voltage detection circuit. Method of Malfunction Detection  An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer (The Malfunction voltage is over 400V).
Page 154: Low-Voltage Detection
Troubleshooting SiUS04-904 4.23 Low-voltage Detection Remote Controller Display An abnormal voltage drop is detected by checking the DC voltage detection circuit. Method of Malfunction Detection  The voltage being detected by the DC voltage detection circuit is judged to be below 150 V for Malfunction 0.1 second.
Page 155: Check
SiUS04-904 Check 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 156: Four Way Valve Performance Check
Check SiUS04-904 5.1.3 Four Way Valve Performance Check  09/12 Class 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 DC 220-240 V with Replace the outdoor unit compressor on? (Fig.
Page 157: Thermistor Resistance Check
SiUS04-904 Check 5.1.4 Thermistor Resistance Check Check No.06 Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the graph and the table below.
Page 158: Installation Condition Check
Check SiUS04-904 5.1.5 Installation Condition Check Check No.07 Installation condition check Check the Abnormal allowable dimensions 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 159: Power Supply Waveforms Check
SiUS04-904 Check 5.1.7 Outdoor Unit Fan System Check 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 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check the Check No.10 waveform disturbance.
Page 160: Capacitor Voltage Check
Check SiUS04-904 5.1.9 Inverter Units Refrigerant System Check Check No.11 Refrigerant system check the discharge thermistor disconnected Correct the problem. from the holder? Check for refrigerant leakage. See the section on refrigerant shortage detection. Replace the refrigerant. (R8314) 5.1.10 Capacitor Voltage Check Check No.12 Before this checking, be sure to check the main circuit for short-circuit.
Page 161 SiUS04-904 Check 5.1.11 Power Transistor Check  Checking the power transistor Check No.13  Never touch any live parts for at least 10 minutes after turning off the circuit breaker.  If you cannot avoid to touch a live part, make sure that the power transistor's supply voltage is below 50 V using the tester.
Page 162: Hall Ic Check
Check SiUS04-904 5.1.13 Rotating Pulse Input on the Outdoor Unit PCB Check  Outdoor fan motor Check No.15 Make sure that the voltage of 320 ± 30 V is applied. 1. Set operation OFF and power OFF. Remove the connector S70. 2.
Page 163: Main Circuit Short Check
SiUS04-904 Check 5.1.15 Main Circuit Short Check  Measure the resistance between pins at both ends of DB1. Check No.29  If the resistance is  or less than 1 k, the main circuit short. (–) terminal of the tester (in case of digital, (–) (+) terminal)
Page 164: Removal Procedure
SiUS04-904 Part 7 Removal Procedure 1. FTXS09/12HVJU..................154 1.1 Removal of Air Filter................154 1.2 Removal of Front Grille ................157 1.3 Removal of Horizontal Blades (Louvers) and Vertical Blades (Fins)..160 1.4 Removal of Electrical Box, PCB and Swing Motor ........162 1.5 Removal of Heat Exchanger ..............
Page 165: Ftxs09/12Hvju
SiUS04-904 FTXS09/12HVJU 1. FTXS09/12HVJU Removal of Air Filter Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points 1. External features  If ON/OFF button is pressed for 5 seconds, a forced cooling operation is carried out for approx.
Page 166 FTXS09/12HVJU SiUS04-904 Step Procedure Points  Left and right filters are Lift center section of air filter and release the interchangeable.  To re-install, insert air filter hooks. Remove air filter by along the guide. pulling forward. 3. Opening and shutting front panel.
Page 167 SiUS04-904 FTXS09/12HVJU Step Procedure Points Remove front panel from the unit. When restoring the air filter, make sure that the projection parts on the panel are in the guide groove, and then shut the panel. Removal Procedure...
Page 168: Removal Of Front Grille
FTXS09/12HVJU SiUS04-904 Removal of Front Grille Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points 1. Opening and closing of service cover. Remove a service cover mounting screw. Open service cover upward.
Page 169 SiUS04-904 FTXS09/12HVJU Step Procedure Points 2. Removal of the front grille assembly.  Screw stoppers inside the flap Remove the 2 screws, in the right and the left, which were equipped in the which fix the main body existing models are not with the front grille.
Page 170 FTXS09/12HVJU SiUS04-904 Step Procedure Points  When restoring the grille, The front grille can be removed in a manner to Make sure whether each hook pull out the upper part is set as it was. forward and lift up the lower part.
Page 171: Removal Of Horizontal Blades (Louvers) And Vertical Blades (Fins)
SiUS04-904 FTXS09/12HVJU Removal of Horizontal Blades (Louvers) and Vertical Blades (Fins) 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 blade.  Screw stoppers inside the flap Lift horizontal blade to open position.
Page 172 FTXS09/12HVJU SiUS04-904 Step Procedure Points  For restoring. 1. Since the key pattern hook is provided on the left side, insert the edge of the blade to the tip while rotating it. 2. Restore the 2 fixed parts of the horizontal blade onto the hook.
Page 173: Removal Of Electrical Box, Pcb And Swing Motor
SiUS04-904 FTXS09/12HVJU Removal of Electrical Box, PCB and Swing Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points  Remove the front grille. 1. Removal of the electrical box.
Page 174 FTXS09/12HVJU SiUS04-904 Step Procedure Points  The electrical box can be Remove the one screw on the terminal board. removed instead of disengaging the terminal board. Remove the one screw on the electrical box. Removal Procedure...
Page 175 SiUS04-904 FTXS09/12HVJU Step Procedure Points  A hook is provided in the Pull up the electrical box forward to remove. back. Removal Procedure...
Page 176 FTXS09/12HVJU SiUS04-904 Step Procedure Points 2. Removal of the PCBs Remove the shelter. Release the front plate of the electrical box. Release the knobs by pushing the 2 hooks at the top and the bottom. Sliding to the left, the front part of the electrical box can be removed.
Page 177 SiUS04-904 FTXS09/12HVJU Step Procedure Points Release the 4 knobs on the back of the signal receiver PCB. Signal receiver PCB. Signal receiver PCB Removal Procedure...
Page 178 FTXS09/12HVJU SiUS04-904 Step Procedure Points  The control PCB is integrated Control PCB. with the power supply PCB. Glass tabu fuse 3.15A 250V (HA terminal) S7(Fan motor) S6(Swing motor) (Address) (Heat exchanger thermistor) (R2541) 3. Removal of the swing motor assembly.
Page 179: Removal Of Heat Exchanger
SiUS04-904 FTXS09/12HVJU Removal of Heat Exchanger Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points  Conduct pump-down Warning operation.  Remove the installation If gas leaks, collect all refrigerant from the unit, then frame from the mounting repair the spot of leaking.
Page 180 FTXS09/12HVJU SiUS04-904 Step Procedure Points Release the hooks of the piping fixture on the back by a flat screwdriver.  Be careful to prevent pipe Pull the auxiliary pipe forward to an angle of 10 deformation. to 20 degrees. Removal Procedure...
Page 181 SiUS04-904 FTXS09/12HVJU Step Procedure Points Release the hooks located right and left side, and pull heat exchanger forward. The hooks are symmetrically placed in the right and the left.  Lifting the heatexchanger slightly upward to the right, the left hook disengages easily.
Page 182: Install Of Drain Plug
FTXS09/12HVJU SiUS04-904 Install of Drain Plug Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points  The drain pan is integrated Disconnect the drain hose. with the bottom plate. Pull out the drain plug in the left on the drain pan by hand.
Page 183 SiUS04-904 FTXS09/12HVJU Step Procedure Points  Push it into the inner part Push the drain plug into the right with an Allen firmly. wrench. Removal Procedure...
Page 184: Removal Of Fan Rotor And Fan Motor
FTXS09/12HVJU SiUS04-904 Removal of Fan Rotor and Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points  Remove the heat exchanger. To remove the right side plate, remove the 3 screws.
Page 185 SiUS04-904 FTXS09/12HVJU Step Procedure Points Release hook. Remove the hexagon-head set screw on the fan rotor. Removal Procedure...
Page 186 FTXS09/12HVJU SiUS04-904 Step Procedure Points Remove the motor and fan rotor. Remove the one screw on the left side plate. Removal Procedure...
Page 187 SiUS04-904 FTXS09/12HVJU Step Procedure Points Release the hook on the back. Since the fan bearing is made of rubber, firmly push it off from the inside. The bearing can be removed just as the left side plate is attached. Removal Procedure...
Page 188: Ftxs15/18/24Hvju
FTXS15/18/24HVJU SiUS04-904 2. FTXS15/18/24HVJU Removal of the 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. Features  When the signal receiver catches a signal from the remote controller, it produces a beep and the operation...
Page 189 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points Lift one air filter upwards slightly by the center knob, and then pull it out downwards.  The right and left filters are interchangeable.  Insert the air filters along grooves when installing.  Set the air filters with displaying “FRONT”...
Page 190 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points 3. Removal of the “air-purifying filter with photocatalytic deodorizing function”.  The right and left filters are Push up the bottom of an air-purifying filter to interchangeable. release the hooks (2 on lower, 3 on upper) and take the filter out.
Page 191 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points 4. Removal of the front panel. While opening the front panel further than it stops, release both axes and remove the front panel.  Slide the front panel side to side to release each axis. ...
Page 192: Removal Of Front Grille
FTXS15/18/24HVJU SiUS04-904 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. Loosen the screw and remove the service cover by the knob.
Page 193 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points  The front grille has 3 hooks on Release the 3 hooks on the top of the front grille. the center and the both sides of the upper part.  Refer to the removal procedure in a reverse way when reassembling.
Page 194 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points  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. remove the front grille. Removal Procedure...
Page 195: Removal Of Horizontal Blades (Louvers) / Vertical Blades (Fins)
SiUS04-904 FTXS15/18/24HVJU Removal of Horizontal Blades (Louvers) / Vertical Blades (Fins) 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.  It has no fixing screws inside Open the horizontal blades.
Page 196 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points  Installation procedure 1. Since key pattern hook is provided, rotate the blades and fit it to the right pivot first. 2. Fit the blades to the center and left pivots. 2. Removal of the vertical blades.
Page 197 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points Pull the vertical blades rightward and remove it. Removal Procedure...
Page 198: Removal Of Electrical Box / Pcb / Swing Motor
FTXS15/18/24HVJU SiUS04-904 Removal of Electrical Box / PCB / Swing Motor 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 Refer to page 181.
Page 199 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points 3. Disconnect the indoor heat exchanger thermistor and the ground.  Take care to not to lose the clip for the thermistor. 4. Removal of the electrical box.  You can remove the electrical Disconnect the 4 connection wirings.
Page 200 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points Disconnect the connectors for swing motor (S6, S8). Remove the fixing screw of the electrical box.  The electrical box has one Dislocate the electrical box to the left and release hook on its back. the back hook.
Page 201 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points  Hook the back hook of the Pull the electrical box out toward you. electrical box when reassembling.  Screw: M4 16 Remove the screw on the electrical box. Push the shelter up and release the hook. Removal Procedure...
Page 202 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points  Release the hooks on the Press the receiver units down and release the upper side. hooks on the upper side, and then release the hooks on the lower side. Cut the clamp.  Remove the receiver units The receiver units contain 4 PCBs.
Page 203 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points  Clamps should be always Cut the clamp. available. Fix it as it was before. 5. Removal of the control PCB. Release the 2 hooks on the lower side, and then the 2 hooks on the upper side.
Page 204 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points 6. Removal of the swing motor for horizontal blades. Remove the screw of the swing motor. 7. Removal of the swing motor for vertical blades.  Releasing the swing axis Release the swing axis on the right side.
Page 205 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points Remove the 2 screws and detach the swing motor assembly.  Six hooks hold the assembly. Remove the 2 screws and remove the swing motor. Removal Procedure...
Page 206: Removal Of Heat Exchanger
FTXS15/18/24HVJU SiUS04-904 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  Removal of the electrical Warning box. If gas leaks, collect all 1.
Page 207 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points Remove the flare nut for liquid piping by 2 wrenches. 2. Removal of the indoor unit. Detach the indoor unit from the installation plate. 3. Removal of the piping fixture. Release the hook on the upper side of the piping fixture on the back of the unit.
Page 208 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points Release the hooks on the left side. Push the fixing hooks on the right side and release. Pull the heat exchanger to Caution the front side and release When removing or reinstalling the hooks completely, and the heat exchanger, be sure to then lift it.
Page 209: Removal Of Fan Rotor / Fan Motor
SiUS04-904 FTXS15/18/24HVJU Removal of Fan Rotor / Fan Motor 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 right side panel.  You can remove the fan rotor Remove the 2 screws.
Page 210 FTXS15/18/24HVJU SiUS04-904 Step Procedure Points Remove the fixing screw of the fan rotor. 3. Removal of the fan motor.  Reassembling the fan motor Remove the fan motor. (1) When reassembling the fan rotor, provide as much as 3/16” clearance between the side face of the rotor and the bottom frame.
Page 211 SiUS04-904 FTXS15/18/24HVJU Step Procedure Points Remove the 2 screws and remove the mounting plate for the bearing. The bearing is made of rubber. Push it inwards firmly and remove it. Removal Procedure...
Page 212: Rxs09/12Davju, Rx09/12Favju
RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 3. RXS09/12DAVJU, RX09/12FAVJU Removal of Panels and Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step 1. Features Handle (R10005)  Take care not to cut your finger by the fins of the heat exchanger.
Page 213 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Step Procedure Points  The stop valve cover is united with the shelter. The US models have a drip proof plate on the electrical box mounting plate instead of on the cover. Remove the 2 screws to remove the drip proof plate.
Page 214 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points Remove the 4 screws of the discharge grille. (R10009)  The discharge grille has 4 hooks. (R10010) Remove the 8 screws of the front panel. Front panel (R10011) Removal Procedure...
Page 215 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Step Procedure Points  The front panel has 4 hooks. Release the hooks.  The fan motor is united with Pull and remove the front panel. the front panel. Hooks (R10012)  The screw has clockwise 3. Removal of the fan motor. winding.
Page 216 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points Cut the clamp. (R7198) Disconnect the fan motor [S70] connector [S70]. (R7199) The illustration shows Fan motor arrangement of the fan lead wire motor lead wire. (R7200) Removal Procedure...
Page 217 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Step Procedure Points  Put the lead wire through the Release the lead wire from the fixing hooks. back of the motor when reassembling to prevent getting it entangled with the outdoor fan. Lead wire Outdoor fan (R3249) (R7201) ...
Page 218 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points (R7205)  When reassembling, fit the lower hook into the bottom frame. (R7206) 4. Removal of the right side panel. Remove the 2 screws on the rear side. (R10015) Removal Procedure...
Page 219 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Step Procedure Points Release the outdoor air Outdoor air thermistor thermistor. (R7208) Lift up the guard net to remove. Guard net (R10016) Remove the 4 screws on the right side. Right side panel (R10017) Removal Procedure...
Page 220 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points Remove the screw and lift the connection port to remove it. (R10018)  When reassembling, make sure to engage the hook. (R7212) Lift up the right side panel to remove it. Hook (R10019) Removal Procedure...
Page 221: Removal Of Electrical Box
SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU 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  Remove the top panel.  Disconnect the connector for fan motor. 1.
Page 222 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points  The positions of connectors Disconnect the connector [S40] for overload protector on each PCB are different [S40]. according to the models. (R7217) Disconnect the connector [S20] for electronic expansion valve coil [S20]. (R7218) Disconnect the connector for four-way valve coil [S80].
Page 223 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Step Procedure Points  Be careful not to lose the clip Release the discharge pipe thermistor. for thermistor. Thermistor Clip Piping (R0251) Discharge pipe thermistor (R0267) Cut the clamp. (R7221)  Be careful not to lose the clip. Pull out the heat exchanger thermistor.
Page 224 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points Lift and remove the Electrical Box electrical box. (R7223) Removal Procedure...
Page 225: Removal Of Reactor And Partition Plate
SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Removal of Reactor and Partition Plate Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step  Remove the outer panels. Reactor  Removal of the electrical box.
Page 226 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points The partition plate has a hook on the lower side. Lift and pull the partition plate to remove. (R7227)  When reassembling, engage the lower hook with the bottom frame. Hook (R7228) Removal Procedure...
Page 227: Removal Of Sound Blanket
SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Removal of Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step  Remove the outer panels.  Remove the electrical box. 1. Removal of the sound blanket.
Page 228 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points  The sound blanket’s piping Pull the sound blanket (inner) out. ports are easily torn so remove it carefully. (R7232) Removal Procedure...
Page 229: Removal Of Four-Way Valve
SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Removal of Four-Way Valve 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 peripheries. Remove the electronic expansion valve coil. (R7233) Terminal cover ...
Page 230 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points Remove the screw of the four-way valve coil. Caution Be careful not to get burned by pipes and other parts that are heated by the gas welding rod. Caution For global environmental protection, do not discharge the refrigerant gas in the atmosphere.
Page 231 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Step Procedure Points  Provide a protective sheet or Warning a steel plate so that the brazing flame cannot If refrigerant gas leaks influence peripheries. during installation,  Be careful not to break the ventilate the area pipes by pressing excessively immediately.
Page 232: Removal Of Compressor
RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Removal of Compressor 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 compressor. Warning Unscrew the 3 nuts of the Ventilate the area thoroughly if compressor.
Page 233 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Heat up the brazed part of the suction side and disconnect. (R7253) Lift the compressor up and remove it. (R7254) Removal Procedure...
Page 234: Removal Of Pcb
RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 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  You can remove the PCB 1. Removal of the PCB. when you disconnect the read Feature of the PCB wires on the terminal board without removing the electrical...
Page 235 SiUS04-904 RXS09/12DAVJU, RX09/12FAVJU Step Procedure Points  The positions of screws are Remove the 4 screws. different according to the models. Screws (R7258) Release the 3 hooks on the upper side. (R7259) Removal Procedure...
Page 236 RXS09/12DAVJU, RX09/12FAVJU SiUS04-904 Step Procedure Points Lift and pull out the PCB.  See page 19 for details. Feature of the PCB Glass fuse S70: fan motor 3.15 A S80: four way valve S90: thermistor (outdoor air, heat exchanger, discharge pipe) LED A (R7260) Removal Procedure...
Page 237: Rxs15/18/24Dvju, Rx15/18/24Fvju
SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU 4. RXS15/18/24DVJU, RX15/18/24FVJU Removal of Panels and Plates 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 panels and plates. Remove the 4 screws and lift the top panel.
Page 238 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points Remove the 4 screws and remove the discharge grille.  The front grille has 4 hooks. Slide the discharge grille upward and remove it. Remove the 6 screws of the front panel. Removal Procedure...
Page 239 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Push the front panel and release the hook. Lift the clamp plate and remove it.  Lift the front panel and Release the right side hook, and then the left remove it while pushing the side hooks.
Page 240 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points  Lift the front panel and undo the left side hooks.  Fit the left side of the front panel first when installing. 2. Removal of the stop valve cover. Remove the screw of the stop valve cover.
Page 241 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Pull down the stop valve cover to release the hooks and remove it.  The stop valve cover has 6 hooks.  The US models have a drip proof plate on the right side panel instead of on the stop valve cover.
Page 242: Removal Of Fan Motor / Outdoor Fan
RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Removal of Fan Motor / Outdoor Fan Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step  Remove the top panel and the front panel. Shelter ...
Page 243 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points 2. Removal of the fan motor. Disconnect the connector for fan motor (S70). The illustration shows arrangement of the fan motor lead wire. Removal Procedure...
Page 244 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points Remove the washer-fitted nut of the outdoor fan with a spanner.  Align  mark of the outdoor fan with D-cut section of the motor shaft when reassembling. Remove the 4 screws from the fan motor. Removal Procedure...
Page 245 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points  Put the lead wire through the Pull the fan motor out. back of the motor when reassembling so as not to be entangled with the outdoor fan. (R2697) Removal Procedure...
Page 246: Removal Of Pcb / Electrical Box
RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Removal of PCB / Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step  Remove the top panel and the front panel. 1.
Page 247 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Remove the fixing screw of the electrical box.  Insert the 2 hooks of the lower part and the one hook of the upper back when Hook reassembling. (R5485) Hooks (R5486) Removal Procedure...
Page 248 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points 2. Removal of the harnesses.  Service monitor PCB Remove the fixing screw in the cable way board. LED A (Green) LEDA(Green) A B C (Initial setting: OFF) (R2704) Push the hook up to release the cable way board.
Page 249 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Disconnect the connectors of the front side. S20: electronic expansion valve S40: overload protector S80: four-way valve S90: thermistors (discharge pipe, outdoor air, heat exchanger) Remove the screw of the control PCB. Release the 2 hooks and release the control PCB from the ditch of the front side.
Page 250 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points Disconnect the harnesses while opening the control PCB. S10: to the terminal strip AC2: to the terminal strip Disconnect the connectors. S51: to the service monitor PCB S101: to the service monitor PCB Disconnect the connectors.
Page 251 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Control PCB (outdoor unit) S10: to the terminal strip S20: electronic expansion valve S31: to CN14 of the SPM S32: to CN11 of the SPM S33: to S34 of the MID S40: overload protector S51: to S52 of the service monitor PCB S71: to S72 of the MID...
Page 252 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points Release the clamp with pliers. (R2715) Release the reactor harness. Removal Procedure...
Page 253 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Pull the clamp and draw the thermistor harness out from the back of the electrical box. Remove the screw of the electrical box. Removal Procedure...
Page 254 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points Release the clamp of the four-way valve harness. (R2720) Lift the electrical box and remove it. Removal Procedure...
Page 255: Removal Of The Reactor
SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Removal of the Reactor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step  Removal of the electrical box. 1. Remove the partition plate. Release the clamp with pliers.
Page 256 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points Lift the partition plate and remove it. Remove the screw. Slide the reactor and remove it from the partition plate. Removal Procedure...
Page 257: Removal Of Sound Blanket
SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Removal of Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step Release the harness of each thermistor.  Pay attention to the direction Release the discharge pipe thermistor.
Page 258 RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Step Procedure Points  Clamps should be always Cut the clamp with wire cutters. available. Release the outdoor heat Fix it as it was before. exchanger thermistor.  The outer-side sound Remove the sound blanket (side-outer). blanket’s piping ports are easily torn so remove it carefully.
Page 259 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Remove the sound blanket (top-lower).  The inner-side sound Remove the sound blanket (side-inner). blanket’s piping ports are easily torn so remove it carefully. Removal Procedure...
Page 260: Removal Of Four-Way Valve
RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Removal of Four-Way Valve Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Step Procedure Points  Provide a protective sheet or Remove the screw of the four-way valve coil. a steel plate so that the brazing flame cannot influence peripheries.
Page 261: Removal Of Electronic Expansion Valve
SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Removal of Electronic Expansion Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step Remove the electronic expansion valve coil. Remove the sheets of putty.
Page 262: Removal Of Compressor
RXS15/18/24DVJU, RX15/18/24FVJU SiUS04-904 Removal of Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembly work. Procedure Points Step Remove the terminal cover.  Be careful so as not to burn Release the lead wires of the compressor.
Page 263 SiUS04-904 RXS15/18/24DVJU, RX15/18/24FVJU Step Procedure Points Remove the 3 nuts of the compressor. Remove the putty of the accumulator.  Before working, make Warning sure that the Ventilate when refrigerant refrigerant is empty in leaks during the work. the circuit. If refrigerant contacts fire, it ...
Page 264 SiUS04-904 Part 8 Other Considerations 1. Other Considerations ................254 1.1 Trial Operation..................254 1.2 Jumper Settings ..................255 1.3 Application of Silicon Grease to Power Transistor and Diode Bridge ..256 Other Considerations...
Page 265: Other Considerations
SiUS04-904 Other Considerations 1. Other Considerations Trial Operation 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 266: Jumper Settings
Other Considerations SiUS04-904 Jumper Settings 1.2.1 When 2 Units are Installed in 1 Room When 2 indoor units are installed in 1 room, one of the 2 wireless remote controllers can be set for different address. How to set the different address ...
Page 267: Application Of Silicon Grease To Power Transistor And Diode Bridge
SiUS04-904 Other Considerations Application of Silicon Grease to 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 268: Appendix
SiUS04-904 Part 9 Appendix 1. Piping Diagrams..................258 1.1 Indoor Units ..................... 258 1.2 Outdoor Units ..................259 2. Wiring Diagrams..................261 2.1 Indoor Units ..................... 261 2.2 Outdoor Units ..................262 Appendix...
Page 269: Piping Diagrams
SiUS04-904 Piping Diagrams 1. Piping Diagrams Indoor Units FTXS09/12HVJU FTXS15/18/24HVJU INDOOR UNIT INDOOR UNIT HEAT EXCHANGER 9/32CuT ( 5/16CuT ) 1/4CuT THERMISTOR 1/4CuT HEAT EXCHANGER ON HEAT EXCH. 1/4CuT THERMISTOR ON HEAT EXCH. CROSS FLOW FAN FIELD PIPING CROSS FLOW FAN FIELD PIPING (1/4CuT) ( 1/4CuT )
Page 270: Outdoor Units
Piping Diagrams SiUS04-904 Outdoor Units RXS09DAVJU, RX09FAVJU OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER THERMISTOR 9/32CuT 9/32CuT HEAT EXCHANGER THERMISTOR MOTOR OPERATED VALVE 9/32CuT 1/4CuT 1/4CuT MUFFLER MUFFLER WITH WITH FILTER FILTER PROPELLER FAN 3/8CuT FOUR WAY VALVE FIELD PIPING ON:HEATING ( 1/4CuT ) LIQUID STOP VALVE...
Page 271 SiUS04-904 Piping Diagrams RXS15/18DVJU, RX15/18FVJU OUTDOOR UNIT HEAT EXCHANGER OUTDOOR AIR TEMPERATURE THERMISTOR 5/16CuT 5/16CuT 5/16CuT 1/2CuT 5/16CuT CAPILLARY TUBE 1 5/16CuT MUFFLER 5/16CuT 5/16CuT WITH 5/16CuT REFRIGERANT FLOW FILTER CAPILLARY TUBE 2 1/4CuT 5/16CuT COOLING CAPILLARY TUBE 3 5/16CuT HEATING HEAT 5/16CuT...
Page 272: Wiring Diagrams
Wiring Diagrams SiUS04-904 2. Wiring Diagrams Indoor Units FTXS09/12HVJU PCB3 S36 S35 PCB1 ® INTELLIGENT- EYE SENSOR 3.15A outdoor TERMINAL FOR PCB2 CENTRALIZED CONTROL FIELD WIRING. TRANSMISSION LED1 LED2 LED3 CIRCUIT CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF SIGNAL THE MAIN POWER SUPPLY IS t˚...
Page 273: Outdoor Units
SiUS04-904 Wiring Diagrams Outdoor Units RXS09/12DAVJU, RX09/12FAVJU C100 FIELD WIRING. PCB1 MRM20 IPM1 TO INDOOR UNIT MRM10 3.15A IC11 3.15A POWER SUPPLY PCB2 60Hz 208/230V~ MRCW outdoor NOTE 1. REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. t° t° t° C74, C75 IN CASE OF HEAT PUMP...
Page 274 Organization: DAIKIN INDUSTRIES, LTD. DAIKIN INDUSTRIES AIR CONDITIONING MANUFACTURING DIVISION (THAILAND) LTD. All of the Daikin Group’s business Scope of Registration: facilities and subsidiaries in Scope of Registration: THE DESIGN/DEVELOPMENT AND MANUFACTURE OF Japan are certi ed under the ISO...

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Daikin FTXS09HVJU Service Manual

Safety Considerations

Part 1

List of Functions

Part 2

Specifications

Part 3

Printed Circuit Board Connector Wiring Diagram

Part

Function and Control

Part 5

Operation Manual

Part 6

Service Diagnosis

Part 7

Removal Procedure

Part 8

Other Considerations

Part 9

Appendix

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Summary of Contents for Daikin FTXS09HVJU

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Table of Contents