Page 1 SiUS04-924_A Service Manual Inverter Pair Wall Mounted Type H-Series [Applied Models]  Inverter Pair : Cooling Only  Inverter Pair : Heat Pump...
Page 2: Table Of Contents
SiUS04-924_A Inverter Pair Wall Mounted Type H-Series Cooling Only Indoor Unit FTXS30HVJU FTXS36HVJU Outdoor Unit RKS30HVJU RKS36HVJU Heat Pump Indoor Unit FTXS30HVJU FTXS36HVJU Outdoor Unit RXS30HVJU RXS36HVJU 1. Safety Considerations ................vi Part 1 List of Functions ..............1 1. Functions.....................2 Part 2 Specifications ...............
Page 3 SiUS04-924_A Part 3 Printed Circuit Board Connector Wiring Diagram6 1. Indoor Unit....................7 2. Outdoor Unit....................10 Part 4 Function and Control12 1. Main Functions..................13 1.1 Temperature Control .................. 13 1.2 Frequency Principle..................13 1.3 Airflow Direction Control................15 1.4 Fan Speed Control for Indoor Unit ............. 17 1.5 Program Dry Operation ................
Page 4 SiUS04-924_A 2.4 COMFORT AIRFLOW Operation ............... 49 2.5 INTELLIGENT EYE Operation ..............50 2.6 POWERFUL Operation ................52 2.7 OUTDOOR UNIT QUIET Operation............53 2.8 ECONO Operation ..................54 2.9 TIMER Operation ..................55 2.10 WEEKLY TIMER Operation ............... 57 Part 6 Service Diagnosis..............
Page 5 SiUS04-924_A 5.5 Four Way Valve Performance Check ............113 5.6 Inverter Unit Refrigerant System Check........... 113 5.7 “Inverter Checker” Check ................. 114 5.8 Rotation Pulse Check on the Outdoor Unit PCB ........116 5.9 Installation Condition Check..............117 5.10 Discharge Pressure Check............... 118 5.11 Outdoor Fan System Check ..............
Page 6 SiUS04-924_A Part 9 Appendix................189 1. Piping Diagrams..................190 1.1 Indoor unit ....................190 1.2 Outdoor Unit ..................... 191 2. Wiring Diagrams..................192 Table of Contents...
Page 7: Safety Considerations
SiUS04-924_A Safety Considerations 1. Safety Considerations • If refrigerant gas is discharged during repair work, do not touch the discharged refrigerant gas. The Read these SAFETY CONSIDERATIONS carefully before refrigerant gas may cause frostbite. performing any repair work. Comply with these safety symbols without fail.
Page 8 Safety Considerations SiUS04-924_A may generate toxic gases if it comes into contact with • Check the unit foundation for damage on a continual flames. basis, especially if it has been in use for a long time. If left in a damaged condition, the unit may fall and •...
Page 9: List Of Functions
SiUS04-924_A Part 1 List of Functions 1. Functions.....................2 List of Functions...
Page 10: Functions
Functions SiUS04-924_A 1. Functions Category Functions Category Functions   Basic Function Inverter (with Inverter Power Control) Health & Air-Purifying Filter — — Clean  Operation Limit for Cooling (°FDB) Photocatalytic Deodorizing Filter — — 114.8 114.8 Air-Purifying Filter with Photocatalytic Operation Limit for Heating (°FWB) —...
Page 11: Specifications
SiUS04-924_A Part 2 Specifications 1. Specifications ....................4 Specifications...
Page 12: Specifications
Specifications SiUS04-924_A 1. Specifications Cooling Only / 60 Hz, 208 - 230 V Indoor Unit FTXS30HVJU FTXS36HVJU Model Outdoor Unit RKS30HVJU RKS36HVJU 8.8 (3.0 ~ 8.8) 10.2-10.5 (3.0 ~ 10.2-10.5) Capacity Btu/h 30,000 (10,200 ~ 30,000) 35,000-36,000 (10,200 ~ 35,000-36,000) Rated (Min.
Page 13: Heat Pump / 60 Hz, 208 - 230 V
SiUS04-924_A Specifications Heat Pump / 60 Hz, 208 - 230 V Indoor Unit FTXS30HVJU FTXS36HVJU Model RXS30HVJU RXS36HVJU Outdoor Unit 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...
Page 14 SiUS04-924_A Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................7 2. Outdoor Unit....................10 Printed Circuit Board Connector Wiring Diagram...
Page 15: Printed Circuit Board Connector Wiring Diagram6
Indoor Unit SiUS04-924_A 1. Indoor Unit Connectors and PCB (1): Control PCB Other Parts 1) S1 Connector for DC fan motor 2) S21 Connector for centralized control (HA) 3) S25 Connector for INTELLIGENT EYE sensor PCB 4) S32 Indoor heat exchanger thermistor 5) S41 Connector for swing motors 6) S46...
Page 16 SiUS04-924_A Indoor Unit PCB Detail PCB (1): Control PCB (3.15A) LED A 2P227881-1 Printed Circuit Board Connector Wiring Diagram...
Page 17 Indoor Unit SiUS04-924_A PCB (2): Signal Receiver PCB 3P224121-1 PCB (3): Display PCB LED1 LED2 LED3 RTH1 3P224121-1 PCB (4): INTELLIGENT EYE Sensor PCB 3P227885-1 Printed Circuit Board Connector Wiring Diagram...
Page 18: Outdoor Unit
SiUS04-924_A Outdoor Unit 2. Outdoor Unit Connectors and PCB (1): Main PCB Other Parts 1) S10 Connector for terminal board (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...
Page 19 Outdoor Unit SiUS04-924_A PCB Detail PCB (1): Main PCB E1 E2 FU2 V3 V100 S101 S90 S20 S51 FU3 W 2P230094-2 PCB (2): Service Monitor PCB LED A SW4-B SW4-C S102 3P169059-1  SW4-A does not function. Printed Circuit Board Connector Wiring Diagram...
Page 20: Function And Control12
SiUS04-924_A Part 4 Function and Control 1. Main Functions..................13 1.1 Temperature Control .................. 13 1.2 Frequency Principle..................13 1.3 Airflow Direction Control................15 1.4 Fan Speed Control for Indoor Unit ............. 17 1.5 Program Dry Operation ................18 1.6 Automatic Operation................... 19 1.7 Thermostat Control..................
Page 21: Main Functions
Main Functions SiUS04-924_A 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures  Room temperature: temperature of lower part of the room  Set temperature: temperature set by remote controller  Room thermistor temperature: temperature detected by room temperature thermistor ...
Page 22 SiUS04-924_A Main Functions Inverter Principle To regulate the capacity, a frequency control is needed. The inverter makes it possible to vary the rotation speed of the compressor. The following table explains the conversion principle: Phase Description The supplied AC power source is converted into a DC power source. The DC power source is reconverted into a three-phase AC power source with variable frequency.
Page 23: Airflow Direction Control
Main Functions SiUS04-924_A Frequency Limits The following functions regulate the minimum and maximum frequency: Frequency Functions  Four-way valve operation compensation. Refer to page 31.  Compressor protection function. Refer to page 31. High  Discharge pipe temperature control. Refer to page 32. ...
Page 24 SiUS04-924_A Main Functions 3-D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform airconditioning of the entire room. This function is effective for starting the air conditioner. When the horizontal swing and vertical swing are both set to auto mode, the airflow becomes 3-D airflow.
Page 25: Fan Speed Control For Indoor Unit
Main Functions SiUS04-924_A Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.
Page 26: Program Dry Operation
SiUS04-924_A Main Functions Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and fan adjustment buttons are inoperable in this mode. Detail The microcomputer automatically sets the temperature and airflow rate.
Page 27: Automatic Operation
Main Functions SiUS04-924_A Automatic Operation Outline Automatic Cooling / Heating Function When the AUTO mode is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at startup, and automatically operates in that mode. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
Page 28: Thermostat Control
SiUS04-924_A Main Functions Thermostat Control Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Thermostat OFF Condition  The temperature difference is in zone A. Thermostat ON Condition  The temperature difference is above zone C after being in zone A. ...
Page 29: Night Set Mode
Main Functions SiUS04-924_A NIGHT SET Mode Outline When the OFF timer is set, the NIGHT SET Mode is automatically activated. The NIGHT SET Mode keeps the airflow rate setting. Detail The NIGHT SET Mode continues operation at the target temperature for the first hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.
Page 30: Econo Operation
SiUS04-924_A Main Functions ECONO Operation Outline The "ECONO operation" reduces the maximum operating current and the power consumption. This operation 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 31: Intelligent Eye Operation
Main Functions SiUS04-924_A 1.10 INTELLIGENT EYE Operation Outline 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. Detail 1. Detection method by INTELLIGENT EYE If the sensor detects the outputs 10 times/sec.
Page 32: Inverter Powerful Operation
SiUS04-924_A Main Functions 1.11 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. Detail When the POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
Page 33: Other Functions
Main Functions SiUS04-924_A 1.12 Other Functions 1.12.1 Hot-Start Function In order to prevent the cold air blast that normally comes when heating operation is started, the temperature of the indoor heat exchanger is detected, and either the airflow is stopped or lowers to ensure comfortable heating of the room.
Page 34: Function Of Thermistor
SiUS04-924_A Function of Thermistor 2. Function of Thermistor Electronic expansion valve Four way valve Compressor (R14710) (1) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe Exchanger temperature. The system sets the target discharge pipe temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so Thermistor that the target discharge pipe temperature can be obtained.
Page 35: Control Specification
Control Specification SiUS04-924_A 3. Control Specification Mode Hierarchy Outline There are two modes: normal operation mode and forced operation mode for installation and providing servicing. Detail For Cooling Only Model There are following modes. Air conditioner control mode Forced operation mode Forced cooling operation Power transistor test mode Normal operation mode...
Page 36: Frequency Control
SiUS04-924_A Control Specification Frequency Control Outline Frequency is determined according to the difference between the room thermistor temperature and the target temperature. The function is explained as follows. 1. How to determine frequency 2. Frequency command from the indoor unit (Difference between the room thermistor temperature and the target temperature) 3.
Page 37 Control Specification SiUS04-924_A 2. Determine upper limit frequency  The minimum value is set as an upper limit frequency among the frequency upper limits of the following functions: Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze-up protection, defrost. 3.
Page 38: Controls At Mode Changing / Start-Up
SiUS04-924_A Control Specification Controls at Mode Changing / Start-up 3.3.1 Preheating Operation Outline The inverter operation in open phase starts with the conditions of the preheating command from the indoor unit, the outdoor temperature, and the discharge pipe temperature. Outdoor temperature  10°C (50°F)  Control A (preheating for normal state) Detail Outdoor temperature <...
Page 39 Control Specification SiUS04-924_A 3.3.3 Four Way Valve Operation Compensation Outline At the beginning of the operation as the four way valve is switched, the differential pressure to activate the four way valve is acquired by having output frequency which is more than a certain fixed frequency, for a certain fixed time.
Page 40: Discharge Pipe Temperature Control
SiUS04-924_A Control Specification Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the internal temperature of the compressor. If the discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep this temperature from going up further.
Page 41: Input Current Control
Control Specification SiUS04-924_A Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets the frequency upper limit from the input current. In case of heat pump model, this control which is the upper limit control of the frequency takes priority to the lower limit of control of four way valve operation compensation.
Page 42: Freeze-Up Protection Control
SiUS04-924_A Control Specification Freeze-up Protection Control Outline During cooling operation, the signal sent from the indoor unit controls the operating frequency limitation and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) Detail The operating frequency limitation is judged with the indoor heat exchanger temperature.
Page 43: Outdoor Fan Control
Control Specification SiUS04-924_A Outdoor Fan Control 1. Fan OFF delay when stopped The outdoor fan is turned OFF 60 seconds after the compressor stops. 2. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF.
Page 44: Defrost Control
SiUS04-924_A Control Specification 3.10 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish. Detail Conditions for Starting Defrost  The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.
Page 45: Electronic Expansion Valve Control
Control Specification SiUS04-924_A 3.11 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Open Control 1.
Page 46 SiUS04-924_A Control Specification 3.11.1 Fully Closing with Power ON The electronic expansion valve is initialized when turning on the power. The opening position is set and the pressure equalization is developed. 3.11.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens, and develops the pressure equalization.
Page 47 Control Specification SiUS04-924_A 3.11.7 Control for Disconnection of the Discharge Pipe Thermistor Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensation temperature. If the discharge pipe thermistor is disconnected, the electronic expansion valve opens according to the outdoor temperature and the operation frequency, and operates for a specified time, and then stops.
Page 48: Malfunctions
SiUS04-924_A Control Specification 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction may occur in the thermistor. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Outdoor temperature thermistor 3.12.2 Detection of Overcurrent and Overload Outline An excessive output current is detected and, the OL temperature is observed to protect the compressor.
Page 49: Operation Manual
SiUS04-924_A Part 5 Operation Manual 1. System Configuration................42 2. Operation Manual..................43 2.1 Remote Controller ..................43 2.2 AUTO · DRY · COOL · HEAT · FAN Operation .......... 45 2.3 Adjusting the Airflow Direction..............47 2.4 COMFORT AIRFLOW Operation ............... 49 2.5 INTELLIGENT EYE Operation ..............
Page 50: System Configuration
SiUS04-924_A System Configuration 1. System Configuration After installation and test operation of the room air conditioner are completed, the air conditioner should be handled and operated as described in the following pages. Every user should be informed on the correct method of operation and how to check if it can cool (or heat) well, and how to use it efficiently.
Page 51: Operation Manual
Operation Manual SiUS04-924_A 2. Operation Manual Remote Controller Name of Parts Remote Controller: ARC452A21 Signal transmitter Display (LCD) Receiver • It displays the current settings (In this illustration, each section is • To use the remote controller ,aim the shown with its displays on for the transmitter at the indoor unit.
Page 52 SiUS04-924_A Operation Manual Open the front cover ECONO button MODE selector button • Selects the operation mode • ECONO operation Page 19 (AUTO/DRY/COOL/HEAT/F Page 10 SWING button • Adjusting the airflow direction Page 12 QUIET button COMFORT/SENSOR button • OUTDOOR UNIT QUIET operation Page 18 •...
Page 53: Auto · Dry · Cool · Heat · Fan Operation
Operation Manual SiUS04-924_A AUTO · DRY · COOL · HEAT · FAN Operation AUTO · DRY · COOL · HEAT · FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode.
Page 54 SiUS04-924_A Operation Manual  To change the airflow rate setting Press AUTO or COOL or HEAT or FAN mode DRY mode Five levels of airflow rate setting from The airflow rate setting is not variable. " " to " " plus " "...
Page 55: Adjusting The Airflow Direction
Operation Manual SiUS04-924_A Adjusting the Airflow Direction Adjusting the Airflow Direction You can adjust the airflow direction to increase your comfort. Adjusting the upper and lower airflow direction  To adjust the louvers (horizontal blades) Press • " " is displayed on the LCD and the louvers will begin to swing. When the louvers have reached the desired position, press once more.
Page 56 SiUS04-924_A Operation Manual Adjusting the 3-D airflow direction  To start 3-D airflow 1. 3. Press the and the the " " and " " display will light up and the louvers and fins will move in turn.  To cancel 3-D airflow 2.
Page 57: Comfort Airflow Operation
Operation Manual SiUS04-924_A COMFORT AIRFLOW Operation COMFORT AIRFLOW Operation The flow of air will be in the upward direction while in COOL operation and in the downward direction while in HEAT operation, which will provide a comfortable wind that will not come in direct contact with people. ...
Page 58: Intelligent Eye Operation
SiUS04-924_A Operation Manual INTELLIGENT EYE Operation INTELLIGENT EYE Operation "INTELLIGENT EYE" is the infrared sensor which detects the human movement.  To start INTELLIGENT EYE operation Press and select " " on the LCD. • Each time the is pressed a different setting option is displayed on the LCD. •...
Page 59 Operation Manual SiUS04-924_A INTELLIGENT EYE Operation "INTELLIGENT EYE" is useful for energy saving  Energy saving operation • Change the temperature –3.6˚F (–2˚C) in heating / +3.6˚F (+2˚C) in cooling / +3.6˚F (+2˚C) in dry mode from set temperature. • Decrease the airflow rate slightly in FAN mode only. •...
Page 60: Powerful Operation
SiUS04-924_A Operation Manual POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity.  To start POWERFUL operation Press during operation. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the previous settings which were used before POWERFUL operation.
Page 61: Outdoor Unit Quiet Operation
Operation Manual SiUS04-924_A OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. ...
Page 62: Econo Operation
SiUS04-924_A Operation Manual ECONO Operation ECONO Operation ECONO operation is a function which enables efficient operation by limiting the maximum power consumption value. This function is useful for cases in which attention should be paid to ensure a circuit breaker will not trip when the product runs alongside other appliances. ...
Page 63: Timer Operation
Operation Manual SiUS04-924_A TIMER Operation TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination.  To use OFF TIMER operation •...
Page 64 SiUS04-924_A Operation Manual  To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. Press " " is displayed. " " blinks. • " " and day of the week are no longer displayed on the LCD. Press until the time setting reaches the point you like.
Page 65: Weekly Timer Operation
Operation Manual SiUS04-924_A 2.10 WEEKLY TIMER Operation WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week. It is convenient if the WEEKLY TIMER is set according to the family's life style.  Using in these cases of WEEKLY TIMER An example of WEEKLY TIMER settings is shown below.
Page 66 SiUS04-924_A Operation Manual  To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. Program 1 Program 2 Program 3 Program 4 [Monday] 77˚F (25˚C) 81˚F (27˚C)
Page 67 Operation Manual SiUS04-924_A WEEKLY TIMER Operation Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10 minute intervals. • To return to the ON/OFF TIMER mode setting, press • Go to STEP when setting the OFF TIMER.
Page 68 SiUS04-924_A Operation Manual Copy mode • A reservation made once can be copied another day of the week. The whole reservation of the selected day of the week will be copied. Program 1 Program 2 Program 3 Program 4 [Monday] 81˚F (27˚C) 77˚F (25˚C) 6:00...
Page 69 Operation Manual SiUS04-924_A WEEKLY TIMER Operation  Confirming a reservation • The reservation can be confirmed. Setting Displays Normal display Confirmation display Press • The day of the week and the reservation number of the current day will be displayed. Press to select the day of the week and the reservation number to be confirmed.
Page 70 SiUS04-924_A Operation Manual  To deactivate WEEKLY TIMER operation Press while " " is displayed on the LCD. • The " " will be on longer displayed on the LCD. • The TIMER lamp goes off. • To reactivate the WEEKLY TIMER operation, press again.
Page 71 Operation Manual SiUS04-924_A WEEKLY TIMER Operation The reservations for each day of the week • This function can be used for deleting reservations for each day of the week. Press Press to select the day of the week to be deleted.
Page 72: Service Diagnosis
SiUS04-924_A Part 6 Service Diagnosis 1. Troubleshooting with LED .................66 1.1 Indoor Unit....................66 1.2 Outdoor Unit ....................66 2. Problem Symptoms and Measures ............67 3. Service Check Function ................68 4. Troubleshooting ..................71 4.1 Error Codes and Description ..............71 4.2 Indoor Unit PCB Abnormality ..............
Page 73 SiUS04-924_A 5.10 Discharge Pressure Check............... 118 5.11 Outdoor Fan System Check ..............118 5.12 Capacitor Voltage Check................119 5.13 Power Module Check ................119 Service Diagnosis...
Page 74: Troubleshooting With Led
SiUS04-924_A Troubleshooting with LED 1. Troubleshooting with LED Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.
Page 75: Problem Symptoms And Measures
Problem Symptoms and Measures SiUS04-924_A 2. Problem Symptoms and Measures Symptom Check Item Details of Measure Reference Page The unit does not operate. Check the power supply. Check if the rated voltage is supplied. — Check the type of the indoor unit. Check if the indoor unit type is compatible with the —...
Page 76: Service Check Function
SiUS04-924_A Service Check Function 3. Service Check Function 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature Check Method 1 display screen. Timer cancel button < ARC452 Series > (R14460) 2. Press the timer cancel button repeatedly until a long beep sounds. ...
Page 77 Service Check Function SiUS04-924_A Check Method 2  , TEMP  , MODE) simultaneously to enter the diagnosis mode. 1. Press the 3 buttons (TEMP (R14550) The left-side number blinks. (R9430)  or  button and change the figure until you hear the beep(s). 2.
Page 78 SiUS04-924_A Service Check Function  or  button  and change the figure until you hear the beep(s). 5. Press the TEMP (R14547) 6. Diagnose by the sound. beep : The left-side number does not correspond with the error code. beep beep : The left-side number corresponds with the error code but the right-side number does not.
Page 79: Troubleshooting
Troubleshooting SiUS04-924_A 4. Troubleshooting Error Codes and Description Reference Error Codes Description Page System Normal — U0 Refrigerant shortage Low-voltage detection or over-voltage detection Signal transmission error (between indoor unit and outdoor unit) Unspecified voltage (between indoor unit and outdoor unit) Indoor Indoor unit PCB abnormality Unit...
Page 80: Indoor Unit Pcb Abnormality
SiUS04-924_A Troubleshooting Indoor Unit PCB Abnormality Remote Controller Display Method of The system checks if the circuit works properly within the microcomputer of the indoor unit. Malfunction Detection Malfunction The system cannot set the internal settings. Decision Conditions  Wrong models interconnected Supposed ...
Page 81: Freeze-Up Protection Control Or Heating Peak-Cut Control
Troubleshooting SiUS04-924_A Freeze-up Protection Control or Heating Peak-cut Control Remote Controller Display  Freeze-up protection control Method of Malfunction During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor. Detection ...
Page 82 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Check the air passage. Refer to P.110 Is there any short circuit? Provide sufficient air passage. Check the air filter.
Page 83: Fan Motor (Dc Motor) Or Related Abnormality
Troubleshooting SiUS04-924_A Fan Motor (DC Motor) or Related Abnormality Remote Controller Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation. Detection Malfunction The detected rotation speed does not reach the demanded rotation speed of the target tap, and is Decision less than 50% of the maximum fan motor rotation speed.
Page 84 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.02 Turn off the power supply Refer to P.111 and rotate the fan by hand. Does the fan Replace the indoor rotate smoothly? fan motor.
Page 85: Thermistor Or Related Abnormality (Indoor Unit)
Troubleshooting SiUS04-924_A Thermistor or Related Abnormality (Indoor Unit) C4, C9 Remote Controller Display Method of The temperatures detected by the thermistors determine thermistor errors. Malfunction Detection Malfunction The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Decision Conditions ...
Page 86: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)
SiUS04-924_A Troubleshooting Signal Transmission Error (between Indoor Unit and Outdoor Unit) Remote Controller Display Method of The data received from the outdoor unit in indoor unit - outdoor unit signal transmission is checked Malfunction whether it is normal. Detection Malfunction The data sent from the outdoor unit cannot be received normally, or the content of the data is Decision abnormal.
Page 87 Troubleshooting SiUS04-924_A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Check the indoor unit - outdoor unit Refer to P.111 connection wires. Is there any wiring error? Correct the indoor unit - outdoor unit connection wires.
Page 88: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)
SiUS04-924_A Troubleshooting Unspecified Voltage (between Indoor Unit and Outdoor Unit) Remote Controller Display Method of The supply power is detected for its requirements (different from pair type and multi type) by the indoor / outdoor transmission signal. Malfunction Detection Malfunction The pair type and multi type are interconnected.
Page 89: Outdoor Unit Pcb Abnormality
Troubleshooting SiUS04-924_A Outdoor Unit PCB Abnormality Remote Controller Display  The system follows the microprocessor program as specified. Method of  The system checks to see if the zero-cross signal comes in properly. Malfunction Detection  The microprocessor program runs out of control. Malfunction ...
Page 90: Ol Activation (Compressor Overload)
SiUS04-924_A Troubleshooting OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection  If the error repeats, the system is shut down. Malfunction  Reset condition: Continuous run for about 60 minutes without any other error Decision ...
Page 91: Compressor Lock
Troubleshooting SiUS04-924_A 4.10 Compressor Lock Remote Controller Display Method of A compressor lock is detected by the current waveform generated when applying high-frequency Malfunction voltage to the motor. Detection  If the error repeats, the system is shut down Malfunction ...
Page 92: Dc Fan Lock
SiUS04-924_A Troubleshooting 4.11 DC Fan Lock Remote Controller Display Method of An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Malfunction Detection  The fan does not start in 15 ~ 60 seconds even when the fan motor is running. Malfunction ...
Page 93: Input Overcurrent Detection
Troubleshooting SiUS04-924_A 4.12 Input Overcurrent Detection Remote Controller Display Method of An input overcurrent is detected by checking the input current value with the compressor running. Malfunction Detection  The current exceeds 20 A for 2.5 seconds with the compressor running. Malfunction Decision (The upper limit of the current decreases when the outdoor temperature exceeds a certain...
Page 94: Four Way Valve Abnormality
SiUS04-924_A Troubleshooting 4.13 Four Way Valve Abnormality Remote Controller Display Method of The room temperature thermistor, the indoor heat exchanger thermistor, the outdoor temperature Malfunction thermistor, and the outdoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Detection Malfunction A following condition continues over 1 minute after operating for 10 minutes.
Page 95 Troubleshooting SiUS04-924_A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Four way valve coil Correct it. Refer to P.110 disconnected (loose)? Check No.13 Harness out of connector? Refer to P.113 Reconnect it.
Page 96: Discharge Pipe Temperature Control
SiUS04-924_A Troubleshooting 4.14 Discharge Pipe Temperature Control Remote Controller Display Method of An error is determined with the temperature detected by the discharge pipe thermistor. Malfunction Detection  If the temperature detected by the discharge pipe thermistor rises above 120°C (248°F), the Malfunction Decision compressor stops.
Page 97: High Pressure Control In Cooling
Troubleshooting SiUS04-924_A 4.15 High Pressure Control in Cooling Remote Controller Display Method of High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the Malfunction temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Detection ...
Page 98 SiUS04-924_A Troubleshooting Troubleshooting Check No.01 Refer to P.110 Check No.12 Refer to P.112 Check No.17 Refer to P.117 Check No.18 Refer to P.118 Check No.19 Refer to P.118 n off the power switch before connecting or disconnecting r parts may be damaged. Change the installation location or direction.
Page 99: Compressor System Sensor Abnormality
Troubleshooting SiUS04-924_A 4.16 Compressor System Sensor Abnormality Remote Controller Display  The system checks the supply voltage and the DC voltage before the compressor starts. Method of  The system checks the compressor current right after the compressor starts. Malfunction Detection ...
Page 100 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Check the connection of the reactor. Connection OK? Connect it properly. Check the connection of the compressor.
Page 101: Position Sensor Abnormality
Troubleshooting SiUS04-924_A 4.17 Position Sensor Abnormality Remote Controller Display Method of A compressor start-up failure is detected by checking the compressor running condition through the Malfunction position detection circuit. Detection  If the error repeats, the system is shut down. Malfunction ...
Page 102 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Turn off the power. Refer to P.114 Check the power supply voltage. Check No.18 Refer to P.118 Voltage as rated? Correct the power supply.
Page 103: Ct Or Related Abnormality
Troubleshooting SiUS04-924_A 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  The compressor running frequency is more than A Hz, and the CT input current is below B A. Malfunction Decision A (Hz)
Page 104 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Turn off the power and turn it on Refer to P.114 again. Check No.21 Start operation. Refer to P.119 ∗...
Page 105: Thermistor Or Related Abnormality (Outdoor Unit)
Troubleshooting SiUS04-924_A 4.19 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Remote Controller Display Method of This fault is identified based on the thermistor input voltage to the microcomputer. Malfunction A thermistor fault is identified based on the temperature sensed by each thermistor. Detection ...
Page 106 SiUS04-924_A Troubleshooting Troubleshooting In case of “H9” “J3” “J6” Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.110 Turn on the power again. Error displayed again Reconnect the connectors on remote controller? or thermistors.
Page 107: Electrical Box Temperature Rise
Troubleshooting SiUS04-924_A 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  With the compressor off, the radiation fin temperature is above A. Malfunction ...
Page 108 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.17 WARNING Turn off the power and turn it on again. To cool the electrical components, Refer to P.117 the outdoor fan starts when the radiation fin temperature rises above C and stops when it drops...
Page 109: Radiation Fin Temperature Rise
Troubleshooting SiUS04-924_A 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  If the radiation fin temperature with the compressor on is above A. Malfunction ...
Page 110 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.17 Turn off the power and turn it on Refer to P.117 again to start the system. Check No.19 Refer to P.118 Error displayed again?
Page 111: Output Overcurrent Detection
Troubleshooting SiUS04-924_A 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 112 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output Check No.15 overcurrent after the wires have been disconnected and reconnected for part replacement, check the Refer to P.114...
Page 113: Refrigerant Shortage
Troubleshooting SiUS04-924_A 4.23 Refrigerant Shortage Remote Controller Display Method of Refrigerant shortage detection I: Malfunction Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If the refrigerant is short, the input current is lower than the normal value. Detection Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of...
Page 114 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.110 Any thermistor Replace them in position. disconnected? ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗...
Page 115: Low-Voltage Detection Or Over-Voltage Detection
Troubleshooting SiUS04-924_A 4.24 Low-voltage Detection or Over-voltage Detection Remote Controller Display Method of Low-voltage detection: Malfunction An abnormal voltage drop is detected by the DC voltage detection circuit. Detection Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit. Malfunction Low-voltage detection: ...
Page 116 SiUS04-924_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the supply voltage. Supply voltage as Correct the power supply. specified? Check the connection of the compressor harness. Loose or Reconnect it.
Page 117: Signal Transmission Error On Outdoor Unit Pcb
Troubleshooting SiUS04-924_A 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  The abnormality is determined when the data sent from the PM1 can not be received for 9 Malfunction Decision seconds.
Page 118: Check
SiUS04-924_A Check 5. Check Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the table and the graph below.
Page 119: Fan Motor Connector Output Check
Check SiUS04-924_A Fan Motor Connector Output Check Check No.02 1. Check the connection of connector. 2. Check the motor power supply voltage output (pins 4 - 7). 3. Check the motor control voltage (pins 4 - 3). 4. Check the rotation command voltage (pins 4 - 2). 5.
Page 120: Electronic Expansion Valve Check
SiUS04-924_A Check Electronic Expansion Valve Check Check No.12 Conduct the followings to check the electronic expansion valve (EV). 1. Check to see if the EV connector is correctly connected to the PCB. 2. Turn the power off and on again, and check to see if the EV generate latching sound. 3.
Page 121: Four Way Valve Performance Check
Check SiUS04-924_A Four-Way Valve Performance Check Check No.13 Turn off the power and turn it on again. ∗ Four way valve coil Cooling / Dry : No continuity Start heating operation. Heating : Continuity voltage at 208 - 230 Replace the outdoor unit VAC with compressor PCB.
Page 122: Inverter Checker" Check
SiUS04-924_A Check “Inverter Checker” Check  Characteristics Check No.15 If abnormal stop occurs due to compressor startup failure or overcurrent output when using inverter unit, it is difficult to judge whether it is caused by the compressor failure or other failure (control PCB, power module, etc.).
Page 123 Check SiUS04-924_A  Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) When all the LEDs are lit uniformly, the compressor is defective.  Replace the compressor. (2) When the LEDs are not lit uniformly, check the power module. ...
Page 124: Rotation Pulse Check On The Outdoor Unit Pcb
SiUS04-924_A Check Rotation Pulse Check on the Outdoor Unit PCB Check No.16 Make sure that the voltage of 320 ± 30 V is applied. 1. Set operation off and power off. Disconnect the connector S70. 2. Check that the voltage between the pins 4 - 7 is 320 VDC. 3.
Page 125: Installation Condition Check
Check SiUS04-924_A Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air Change the installation suction and location or direction. discharge area. Is the discharged Change the installation air short-circuited? location or direction. Is the outdoor heat Clean the outdoor exchanger very dirty? heat exchanger.
Page 126: Discharge Pressure Check
SiUS04-924_A Check 5.10 Discharge Pressure Check Check No.18 Discharge pressure check High? Replace the compressor. Is the stop valve open? Open the stop valve. Is the connection pipe Replace the pipe installed at deformed? the site. Is the air Dirty filter or indoor / outdoor Clean the dirty one.
Page 127: Capacitor Voltage Check
Check SiUS04-924_A 5.12 Capacitor Voltage Check Check No.21 Before this check, be sure to check the main circuit for short circuit. With the circuit breaker still on, measure the voltage according to the drawing of the model in question. Be careful never to touch any live parts. Multimeter (DC voltage range) (R13538)
Page 128: Removal Procedure
SiUS04-924_A Part 7 Removal Procedure 1. Indoor Unit....................121 1.1 Removal of Air Filters / Front Panel ............121 1.2 Removal of Front Grille ................124 1.3 Removal of Electrical Box ................ 127 1.4 Removal of PCBs ..................133 1.5 Removal of Horizontal Blades / Vertical Blades / Swing Motors ....140 1.6 Removal of Fan Motor................
Page 129: Indoor Unit
Indoor Unit SiUS04-924_A 1. Indoor Unit Removal of Air Filters / Front Panel Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Features Warning Dangerous: High voltage A high voltage is applied to all the electric circuits of this product including thermistors.
Page 130 SiUS04-924_A Indoor Unit Step Procedure Points 3. Remove the Titanium apatite photocatalytic air- purifying filters.  The 3 filters are Remove the Titanium apatite photocatalytic interchangeable. Air filter air-purifying filter assembly by unfastening the projections from the back of the air filter frame.
Page 131 Indoor Unit SiUS04-924_A Step Procedure Points 4. Remove the front panel. While opening the front panel further than it Front Panel stops, release both the shafts. (R9479)  Slide the front panel from side to side to release each shaft. ...
Page 132: Removal Of Front Grille
SiUS04-924_A Indoor Unit Removal of Front Grille Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Remove the service cover. Remove the screw and remove the service cover.
Page 133 Indoor Unit SiUS04-924_A Step Procedure Points  The Illustration shows the left Remove the 3 front grille fixtures. fixture. Front grille fixture (R9489) (R9490)  The convex marks (...) on the Unfasten the 4 hooks on the top of the front front panel indicate the position Hook grille.
Page 134 SiUS04-924_A Indoor Unit Step Procedure Points Hook (R9487)  When reassembling, make sure Pull the upper part of the front grille out and that all the 4 hooks are fastened lift the lower part up, as they were. and then remove the front grille.
Page 135: Removal Of Electrical Box
Indoor Unit SiUS04-924_A Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Layout of the parts Preparation  Remove the front grille according to the “Removal of Front Grille.”...
Page 136 SiUS04-924_A Indoor Unit Step Procedure Points 3. Release the grounding and the indoor heat exchanger thermistor. Remove the screw and release the ground wire. Earth (R9497)  Be careful not to lose the clip of Pull out the indoor heat exchanger thermistor.
Page 137 Indoor Unit SiUS04-924_A Step Procedure Points Disconnect the connector for the fan motor [S1] and release the harness from the hook. (R9500) [S1] Release the ferrite core. Ferrite core (R9501) Disconnect the connector for the swing motors [S41]. [S41] (R9502) Removal Procedure...
Page 138 SiUS04-924_A Indoor Unit Step Procedure Points Release the harness from the hooks. (R9503) Remove the screw of Electrical box the electrical box. (R9504)  Fit the back hook of the Lift up the electrical box from the bottom frame electrical box to the bottom and remove it.
Page 139 Indoor Unit SiUS04-924_A Step Procedure Points Unfasten the hooks of the shield plate. Shield plate (R9506)  The shield plate has 2 hooks at Open the shield plate. the lower part also. Hook (R9508) (R9507) Remove the shield plate. (R9509) Removal Procedure...
Page 140 SiUS04-924_A Indoor Unit Step Procedure Points Internal layout (R9510) Remove the screw of the terminal board. (R9511) Remove the terminal board. (1 hook at the back) Terminal board (R9512) Removal Procedure...
Page 141: Removal Of Pcbs
Indoor Unit SiUS04-924_A Removal of PCBs Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Remove the signal receiver PCB. Cut the clamp. Clamp (R9513) ...
Page 142 SiUS04-924_A Indoor Unit Step Procedure Points Open the signal receiver unit. Unfasten the hook and remove the signal receiver unit. Hook (R9516) Unfasten the hook on Signal receiver PCB the right of the signal receiver PCB. (Then the signal receiver PCB is lifted up.) Signal receiver unit (R13519)
Page 143 Indoor Unit SiUS04-924_A Step Procedure Points Disconnect the connecter. [S48]: control PCB [S48] (R9522) 2. Remove the INTELLIGENT EYE sensor PCB. Unfasten the 2 hooks on the right and then 2 hooks on the left. Remove the INTELLIGENT EYE sensor assembly. Hook Hook INTELLIGENT EYE...
Page 144 SiUS04-924_A Indoor Unit Step Procedure Points  When reassembling, set the Remove the sensor from the shield plate. sensor at the position where it “clicks”. Otherwise, the sensor is not completely set. Sensor Shield plate (R9525) Remove the shield plate by unfastening the 2 hooks.
Page 145 Indoor Unit SiUS04-924_A Step Procedure Points 3. Remove the display PCB. Unfasten the 4 hooks. Display PCB (R9528) Lift up the display PCB. (R9529) Release the harness from the hook. Hook (R9530) Removal Procedure...
Page 146 SiUS04-924_A Indoor Unit Step Procedure Points Disconnect the connector. [S49]: control PCB [S49] (R9531) [S49] (R13520) 4. Remove the control PCB. Unfasten the 3 hooks. Control PCB Lift up and remove the control PCB. Hook Hook (R9517) Pull out the ground wire from the terminal board.
Page 147 Indoor Unit SiUS04-924_A Step Procedure Points Pull out the terminals from the terminal board. Terminal (R9519) [S1] : DC fan motor [S21] : HA connector [S25] : INTELLIGENT EYE sensor [S32] : indoor heat exchanger thermistor [S41] : swing motors [S46] : display PCB [S47] : signal receiver PCB ...
Page 148: Removal Of Horizontal Blades / Vertical Blades / Swing Motors
SiUS04-924_A Indoor Unit Removal of Horizontal Blades / Vertical Blades / Swing Motors Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the horizontal blades.
Page 149 Indoor Unit SiUS04-924_A Step Procedure Points  Removing order Release the shafts in   (right  left  inner right  turn. inner left) right Horizontal blade (R9535) left (R9536) inner right (R9537) inner left (R9538) Removal Procedure...
Page 150 SiUS04-924_A Indoor Unit Step Procedure Points Remove the horizontal blades. (R9539) 2. Remove the fan guards. Remove the sealing material (horizontal). (R14469) Remove the sealing material (vertical). Also remove the other sealing material on the right. (R14470)  Remove the center and right air Remove the left air outlet assembly by outlet assembly likewise.
Page 151 Indoor Unit SiUS04-924_A Step Procedure Points Hook (R9543) Unfasten the 4 lower hooks and the 2 upper Fan guard hooks and remove the fan guard. (R9544) (R9545) Removal Procedure...
Page 152 SiUS04-924_A Indoor Unit Step Procedure Points 3. Remove the swing motors for horizontal blades. Release the interlock rod. Interlock rod (R9546) Pull out the drain hose, then remove the swing motor unit. Drain hose Swing motor unit (R13579) Remove the screw at the center.
Page 153 Indoor Unit SiUS04-924_A Step Procedure Points Remove the 2 pivots. (R9549) Remove the swing Swing motor (upper blade) motors. Caution When reassembling, do not confuse the installing order of the 2 motors and the colors of the connectors. If you set the connectors or motors opposite, the horizontal blades might not move smoothly and could...
Page 154 SiUS04-924_A Indoor Unit Step Procedure Points 4. Remove the swing motor for vertical blades. Remove the link cover. Link cover (R9552) Remove the interlock rod (2) with pliers. Interlock rod (2) (R9553) (R9554) Remove the interlock rod (1). Interlock rod (1) (R9555) Removal Procedure...
Page 155 Indoor Unit SiUS04-924_A 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 156: Removal Of Fan Motor
SiUS04-924_A Indoor Unit Removal of Fan Motor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step Loosen the screw of the fan motor from the air outlet.
Page 157 Indoor Unit SiUS04-924_A Step Procedure Points Unfasten the hook at the front and remove the fan motor fixing plate. Hook (R9561) (R9562) Release the harness from the hook, and remove the screw of the motor mounting plate. Motor mounting plate (R9563) Removal Procedure...
Page 158 SiUS04-924_A Indoor Unit Step Procedure Points  Reassembling the fan motor Remove the motor mounting plate. When reassembling the fan rotor, provide as much as 5 mm (0.2 inch) of play between the side face of the rotor and the bottom frame.
Page 159: Removal Of Indoor Heat Exchanger
Indoor Unit SiUS04-924_A Removal of Indoor Heat Exchanger Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Disconnect the refrigerant Preparation  Remove the electrical box piping.
Page 160 SiUS04-924_A Indoor Unit Step Procedure Points 2. Remove the piping fixture. Detach the indoor unit from the installation plate. (R9571) Push the bottom frame. Bottom frame (R9572) Release the piping fixture. Piping fixture (R9573) Remove the piping fixture. (R9574) Removal Procedure...
Page 161 Indoor Unit SiUS04-924_A Step Procedure Points 3. Remove the indoor heat exchanger.  At an angle of 10° ~ 20° Widen the auxiliary piping. (R9575) Remove the 2 screws Caution on the left side. When removing or reassembling the indoor heat exchanger, be sure to wear gloves or wrap it with cloth to prevent injury from the fins.
Page 162: Removal Of Fan Rotor
SiUS04-924_A Indoor Unit Removal of Fan Rotor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Remove the right side plate. Remove the 2 screws. Right side plate (R9579) Lift the right side plate...
Page 163 Indoor Unit SiUS04-924_A Step Procedure Points Remove the screw of Fan rotor the fan rotor. (R9648)  Reassembling the fan motor Remove the fan motor. When reassembling the fan rotor, provide as much as 1/2” (5 mm) of play between the side face of the rotor and the bottom frame.
Page 164: Outdoor Unit
SiUS04-924_A Outdoor Unit 2. Outdoor Unit Note: The illustrations represent heat pump models. Removal of Outer Panels Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1.
Page 165 Outdoor Unit SiUS04-924_A Step Procedure Points 3. Remove the top panel. Remove the 7 screws Top panel and remove the top panel. (R9750) 4. Remove the right side panel. Remove the 5 screws. Right side panel (R9752) Slide the right side panel downward to unfasten the 2 hooks on the back side.
Page 166 SiUS04-924_A Outdoor Unit Step Procedure Points Hooks (R9590) Remove the right side panel. (R9591) 5. Remove the front panel (2). Remove the 1 screw. Front panel (2) (R9753) Removal Procedure...
Page 167 Outdoor Unit SiUS04-924_A Step Procedure Points Slide the front panel (2) downward to unfasten the 3 hooks. (R9754) (R9755)  The insulation sheet is inserted Remove the front panel (2). between the front panel (2) and the electrical box. Insulation sheet (R9756) Removal Procedure...
Page 168 SiUS04-924_A Outdoor Unit Step Procedure Points  Remove the discharge grille and 6. Remove the front panel (1). the outdoor fan first to remove the front panel (1). Remove the 4 screws on the discharge grille. Discharge grille Front panel (1) (R9757) Pull out the bottom of the discharge grille and...
Page 169 Outdoor Unit SiUS04-924_A Step Procedure Points Remove the 3 screws Partition plate (1) on the partition plate (1). (R9599) Remove the 2 screws at the bottom of the front. (R9600) Remove the screw at the bottom of the left side. (R9601) Removal Procedure...
Page 170 SiUS04-924_A Outdoor Unit Step Procedure Points Remove the screw at the bottom of the back side. (R9602) The front panel (1) has a hook on its front. Lift the front panel (1). Hook (R13627) Remove the front panel (1). (R9604) Removal Procedure...
Page 171 Outdoor Unit SiUS04-924_A Step Procedure Points 7. Remove the rear panel. Remove the 3 screws on the partition plate (2). Rear panel Partition plate (2) (R14473) Lift up slightly and remove the partition plate (2). (R9760) Remove the 3 screws. (R9607) Removal Procedure...
Page 172 SiUS04-924_A Outdoor Unit Step Procedure Points Remove the wire fixing plate. Wire fixing plate (R9608) Remove the 4 screws Rear panel on the rear panel. (R9609) Remove the screw on the bottom frame. (R9610) Remove the screw on Stop valve the stop valve mounting mounting plate plate.
Page 173 Outdoor Unit SiUS04-924_A Step Procedure Points Lift the rear panel upward to unfasten the 2 hooks. (R9613) Push the hooks of the outdoor temperature thermistor holder from inner-side of the rear panel and detach it. (R9615) Outdoor temperature thermistor holder (R9616) Remove the rear panel.
Page 174: Removal Of Electrical Box
SiUS04-924_A Outdoor Unit Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the screw on the stop-valve mounting plate. Stop valve mounting plate (R9617) Remove the screw on...
Page 175 Outdoor Unit SiUS04-924_A Step Procedure Points  When reassembling, insert the Disconnect the Ferrite core connector for fan motor clamp into a small hole. [S70] and release the 2 Fixing position for the ferrite cores attached to ferrite core of the electrical box with electronic expansion valve coil...
Page 176 SiUS04-924_A Outdoor Unit Step Procedure Points The compressor lead wire is fixed on the partition plate (1) with a clamp. Clamp (R9623) Pull out the clamp and release the compressor lead wire. Clamp (R9624) Disconnect the relay connector for the overload protector and the compressor.
Page 177 Outdoor Unit SiUS04-924_A Step Procedure Points 10 Pull out the clamp of the  When reassembling, insert the thermistor harness from clamp into the small hole. under the electrical box. Fixing position for the thermistor harness (R9626) 11 Slide the electrical box leftward to unfasten the hook on the right side of Electrical box...
Page 178: Removal Of Pcbs
SiUS04-924_A Outdoor Unit Removal of PCBs Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step Remove the cover. Preparation Cover  Remove the electrical box according to the “Removal of Electrical Box”.
Page 179 Outdoor Unit SiUS04-924_A Step Procedure Points Remove the screws of the terminal board and the ground wire. Ground wire Terminal board (R5282) Unfasten the hook on the right. Open the terminal board. Disconnect the 1: Black harnesses. 2: White 3: Red L1: Black L2: Brown N1: White...
Page 180 SiUS04-924_A Outdoor Unit Step Procedure Points Disconnect the 2 [HR1] : white harnesses for the [HR2] : blue [HR1] [HR2] Ferrite core  The harness for [HR2] has a reactor [HR1] [HR2]. ferrite core. (R5286) Remove the 3 screws of the main PCB. Release the 4 hooks.
Page 181: Removal Of Fan Motor
Outdoor Unit SiUS04-924_A Removal of Fan Motor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Cut the clamps at 2 locations. (R9630)  Be sure to remove the lower Remove the 2 lower screws first.
Page 182: Removal Of Coils / Thermistors
SiUS04-924_A Outdoor Unit Removal of Coils / Thermistors Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the electronic expansion valve coil. Pull the electronic expansion valve coil out of position.
Page 183 Outdoor Unit SiUS04-924_A Step Procedure Points Remove the sound blanket (top upper). Sound blanket (top upper) (R9634) Remove the discharge pipe thermistor. Discharge pipe thermistor (R9635) At the back side, open the outdoor temperature thermistor holder. Outdoor temperature thermistor holder (R9636) Removal Procedure...
Page 184 SiUS04-924_A Outdoor Unit Step Procedure Points Release the outdoor temperature thermistor. Outdoor temperature thermistor (R9637) 3. Remove the four-way valve coil. Remove the screw. (R9638) Remove the four-way valve coil. (R9639) Four way valve coil Removal Procedure...
Page 185: Removal Of Sound Blankets
Outdoor Unit SiUS04-924_A Removal of Sound Blankets Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Open the sound blanket (outer). Velcro tape Sound blanket (outer) (R9640) ...
Page 186 SiUS04-924_A Outdoor Unit Step Procedure Points Remove the sound blanket (outer). Sound blanket (outer) (R9643) Open the sound blanket (inner). Sound blanket Compressor mount (inner) (R9644)  The sound blanket is fragile. Be Remove the sound blanket (inner). careful of the notches of the compressor mount (4 locations).
Page 187: Removal Of Compressor
Outdoor Unit SiUS04-924_A Removal of Compressor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the terminal cover. Terminal cover (R9650)  U: red, V: yellow, W: blue Pull out the 3 lead wires.
Page 188 SiUS04-924_A Outdoor Unit Step Procedure Points  Before working, make sure that the refrigerant Warning gas is empty in the circuit. Be careful not to burn yourself  Be sure to apply nitrogen with the pipes and other parts replacement when that are heated by the gas heating up the brazed brazing machine.
Page 189: Trial Operation And Field Settings
SiUS04-924_A Part 8 Trial Operation and Field Settings 1. Pump Down Operation................182 2. Forced Cooling Operation ...............183 3. Trial Operation ..................184 4. Field Settings ..................185 4.1 Model Type Setting .................. 185 4.2 Temperature Display Switch ..............185 4.3 When 2 Units are Installed in 1 Room............186 4.4 Facility Setting Switch (cooling at low outdoor temperature)....
Page 190: Pump Down Operation
SiUS04-924_A Pump Down Operation 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing the unit. Detail 1) Remove the valve caps from the liquid stop valve and the gas stop valve. 2) Carry out forced cooling operation.
Page 191: Forced Cooling Operation
Forced Cooling Operation SiUS04-924_A 2. Forced Cooling Operation Item Forced Cooling Conditions The forced cooling operation is allowed when both the following conditions are met. 1) The outdoor unit is not abnormal and not in the 3-minute standby mode. 2) The outdoor unit is not operating. Start The forced cooling operation starts when any of the following conditions is fulfilled.
Page 192: Trial Operation
SiUS04-924_A Trial Operation 3. Trial Operation Outline 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. Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as louver movement, are working properly.
Page 193: Field Settings
Field Settings SiUS04-924_A 4. Field Settings Model Type Setting ARC452A21  This remote controller is common to the heat pump model and cooling only model. Use the DIP switch on the remote controller to set the heat pump model or cooling only model. ...
Page 194: When 2 Units Are Installed In 1 Room
SiUS04-924_A Field Settings When 2 Units are Installed in 1 Room When 2 indoor units are installed in 1 room, 1 of the 2 pairs of indoor unit and wireless remote controller can be set for different addresses. Both the indoor unit PCB and the wireless remote controller need alteration. ...
Page 195: Facility Setting Switch (Cooling At Low Outdoor Temperature)
Field Settings SiUS04-924_A Facility Setting Switch (cooling at low outdoor temperature) Outline This function is limited to facilities where the target of air conditioning is equipment Never use it in a residence or office occupied by people.  You can expand the cooling operation range from –10°C (14°F: normal operation) to –15°C Detail (5°F: cooling at low outdoor temperature setting) by turning on the switch (SW4-B) on the outdoor unit PCB.
Page 196: Application Of Silicon Grease To A Power Transistor And A Diode Bridge188
SiUS04-924_A Application of Silicon Grease to a Power Transistor and a Diode Bridge 5. Application of Silicon Grease to a Power Transistor and a Diode Bridge Applicable All outdoor units using inverter type compressor for room air conditioner. Models When the printed circuit board (PCB) of an outdoor unit is replaced, it is required that silicon grease (*1) is certainly applied to the heat radiation part (the contact point to the radiation fin) of the power transistor and diode bridge.
Page 197: Appendix
SiUS04-924_A Part 9 Appendix 1. Piping Diagrams..................190 1.1 Indoor unit ....................190 1.2 Outdoor Unit ..................... 191 2. Wiring Diagrams..................192 Appendix...
Page 198: Piping Diagrams
SiUS04-924_A Piping Diagrams 1. Piping Diagrams Indoor unit 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 Appendix...
Page 199: Outdoor Unit
Piping Diagrams SiUS04-924_A Outdoor Unit RKS30/36HVJU OUTDOOR UNIT HEAT EXCHANGER OUTDOOR TEMPERATURE 3/8CuT THERMISTOR 5/16CuT HEADER 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT HEAT EXCHANGER (CONDENSER) 5/16CuT THERMISTOR RECEIVER 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 3/8CuT 3/8CuT 3/8CuT 5/16CuT DISTRIBUTOR FILTER MOTOR FILTER DC FAN MOTOR OPERATED CAPILLARY TUBE...
Page 200: Wiring Diagrams
SiUS04-924_A Wiring Diagrams 2. Wiring Diagrams FTXS30/36HVJU PCB3 PCB1 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 GRN / C101 TRANSMISSION CIRCUIT CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY t° IS TURNED OFF AND THEN BACK ON AGAIN. : BUZZER RTH1 C101, C102...
Page 201 Wiring Diagrams SiUS04-924_A Appendix...
Page 202 2011 Daikin Industries, Limited. © Daikin, Daikin AC Absolute Comfort and its design, VRV, REFNET, and Quaternity, Daikin Altherma are trademarks of Daikin Industries, Limited. ISO 14001 is the standard defined by the ISO 9001 is a plant certification system...

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