Page 1 SiUS041111 Service Manual Inverter Pair Wall Mounted Type K-Series [Applied Models]  Inverter Pair : Cooling Only  Inverter Pair : Heat Pump...
Page 2 SiUS041111 Inverter Pair Wall Mounted Type K-Series Cooling Only Indoor Unit FTXN09KEVJU FTXN12KEVJU FTXN15KVJU FTXN18KVJU FTXN24KVJU Outdoor Unit RKN09KEVJU RKN12KEVJU RKN15KEVJU RKN18KEVJU RKN24KEVJU Heat Pump Indoor Unit FTXN09KEVJU FTXN12KEVJU FTXN15KVJU FTXN18KVJU FTXN24KVJU Outdoor Unit RXN09KEVJU RXN12KEVJU RXN15KEVJU RXN18KEVJU RXN24KEVJU Table of Contents...
Page 3: Table Of Contents
SiUS041111 Safety Consideration............vi Part 1 List of Functions ..............1 1. Functions.....................2 Part 2 Specifications ............... 4 1. Specifications ....................5 1.1 Cooling Only....................5 1.2 Heat Pump ....................8 Part 3 Printed Circuit Board Connector Wiring Diagram ..........11 1.
Page 4 SiUS041111 3.4 Discharge Pipe Temperature Control............39 3.5 Input Current Control.................. 40 3.6 Freeze-up Protection Control ..............41 3.7 Heating Peak-cut Control ................41 3.8 Outdoor Fan Control................... 42 3.9 Liquid Compression Protection Function............ 42 3.10 Defrost Control ................... 43 3.11 Electronic Expansion Valve Control ............
Page 5 SiUS041111 4.8 Outdoor Unit PCB Abnormality..............89 4.9 OL Activation (Compressor Overload) ............90 4.10 Compressor Lock ..................91 4.11 DC Fan Lock ....................92 4.12 Input Overcurrent Detection ............... 93 4.13 Four-Way Valve Abnormality..............94 4.14 Discharge Pipe Temperature Control............96 4.15 High Pressure Control in Cooling ...............
Page 6 SiUS041111 2.3 Removal of Horizontal Blades / Vertical Blades ........155 2.4 Removal of Electrical Box / PCBs / Swing Motors ........157 2.5 Removal of Indoor Heat Exchanger ............162 2.6 Removal of Fan Motor / Fan Rotor............165 3.
Page 7: Safety Consideration
SiUS041111 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 SiUS041111 • Do not repair the electrical components with wet left in a damaged condition, the unit may fall and hands. Working on the equipment with wet hands may cause injury. If the installation platform or frame has cause an electrical shock. corroded, have it replaced.
Page 9: List Of Functions
SiUS041111 Part 1 List of Functions 1. Functions.....................2 List of Functions...
Page 10: Functions
Functions SiUS041111 1. Functions Category Functions Category Functions   Basic Function Inverter (with Inverter Power Control) Health & Air-Purifying Filter — — Clean 50 ~ 50 ~ Operation Limit for Cooling (°FDB) Photocatalytic Deodorizing Filter — — 114.8 114.8 Air-Purifying Filter with Photocatalytic Operation Limit for Heating (°FWB) —...
Page 11 SiUS041111 Functions Category Functions Category Functions   Basic Function Inverter (with Inverter Power Control) Health & Air-Purifying Filter — — Clean 50 ~ 50 ~  Operation Limit for Cooling (°FDB) Photocatalytic Deodorizing Filter — — 114.8 114.8 Air-Purifying Filter with Photocatalytic Operation Limit for Heating (°FWB) —...
Page 12: Specifications
SiUS041111 Part 2 Specifications 1. Specifications ....................5 1.1 Cooling Only....................5 1.2 Heat Pump ....................8 Specifications...
Page 13: Specifications
SiUS041111 Specifications 1. Specifications Cooling Only 60 Hz, 208 - 230 V Indoor Unit FTXN09KEVJU FTXN12KEVJU Model Outdoor Unit RKN09KEVJU RKN12KEVJU 2.64 (1.30 ~ 2.78) 3.52 (1.3 ~ 3.52) Capacity Btu/h 9,000 (4,400 ~ 9,500) 12,000 (4,400 ~ 12,000) Rated (Min. ~ Max.)
Page 14 Specifications SiUS041111 60 Hz, 208 - 230 V Indoor Unit FTXN15KVJU FTXN18KVJU Model Outdoor Unit RKN15KEVJU RKN18KEVJU 4.4 (1.7 ~ 4.4) 5.28 (1.7 ~ 5.28) Capacity Btu/h 15,000 (5,800 ~ 15,000) 18,000 (5,800 ~ 18,000) Rated (Min. ~ Max.) kcal/h 3,780 (1,460 ~ 3,780) 4,540 (1,460 ~ 4,540) Moisture Removal...
Page 15 SiUS041111 Specifications 60 Hz, 208 - 230 V Indoor Unit FTXN24KVJU Model Outdoor Unit RKN24KEVJU 6.45 (1.7 ~ 6.45) Capacity Btu/h 22,000 (5,800 ~ 22,000) Rated (Min. ~ Max.) kcal/h 5,550 (1,460 ~ 5,550) Moisture Removal Running Current (Rated) 12.51 - 11.32 Power Consumption 2,560 (300 ~ 2,560) Rated (Min.
Page 16: Heat Pump
Specifications SiUS041111 Heat Pump 60 Hz, 208 - 230 V Indoor Unit FTXN09KEVJU FTXN12KEVJU Model RXN09KEVJU RXN12KEVJU Outdoor Unit Cooling Heating Cooling Heating 2.64 (1.30 ~ 2.78) 2.93 (1.3 ~ 3.4) 3.52 (1.3 ~ 3.52) 3.96 (1.3 ~ 4.8) Capacity...
Page 17 SiUS041111 Specifications 60 Hz, 208 - 230V Indoor Unit FTXN15KVJU FTXN18KVJU Model RXN15KEVJU RXN18KEVJU Outdoor Unit Cooling Heating Cooling Heating 4.4 (1.7 ~ 4.4) 5.28 (1.7 ~ 6.2) 5.28 (1.7 ~ 5.28) 6.33 (1.7 ~ 7.03) Capacity Btu/h 15,000 (5,800 ~ 15,000) 18,000 (5,800 ~ 21,200) 18,000 (5,800 ~ 18,000) 21,600 (5,800 ~ 24,000)
Page 18 Specifications SiUS041111 60 Hz, 208 - 230V Indoor Unit FTXN24KVJU Model RXN24KEVJU Outdoor Unit Cooling Heating 6.45 (1.7 ~ 6.45) 7.03 (1.7 ~ 7.44) Capacity Btu/h 22,000 (5,800 ~ 22,000) 24,000 (5,800 ~ 25,400) Rated (Min. ~ Max.) kcal/h 5,550 (1,460 ~ 5,550) 6,050 (1,460 ~ 6,400) Moisture Removal —...
Page 19: Printed Circuit Board Connector Wiring Diagram
SiUS041111 Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................12 1.1 09/12 Class ....................12 1.2 15/18/24 Class ................... 14 2. Outdoor Unit....................16 2.1 09/12 Class ....................16 2.2 15/18/24 Class ................... 18 Printed Circuit Board Connector Wiring Diagram...
Page 20: Indoor Unit
Indoor Unit SiUS041111 1. Indoor Unit 09/12 Class Connectors and PCB(1): Control PCB Other Parts 1) S6 Connector for swing motor (horizontal blade) 2) S26 Connector for display PCB 3) S32 Connector for indoor heat exchanger thermistor 4) S200 Connector for fan motor 5) S403 Connector for adaptor PCB (option) 6) H1, H2, H3, FG Connector for terminal board...
Page 21 SiUS041111 Indoor Unit PCB Detail PCB(1): Control PCB S200 LED A S32 S403 2P206569-4 PCB(2): Display PCB LED2 LED1 (Solder side) RTH1 3P206563-1 Printed Circuit Board Connector Wiring Diagram...
Page 22: 15/18/24 Class
Indoor Unit SiUS041111 15/18/24 Class Connectors and PCB (1): Control PCB Other Parts 1) S1 Connector for DC fan motor 2) S6 Connector for swing motor (horizontal blades) 3) S21 Connector for centralized control (HA) 4) S26 Connector for buzzer PCB 5) S28 Connector for signal receiver PCB 6) S32...
Page 23 SiUS041111 Indoor Unit PCB Detail PCB (1): Control PCB LED A 2P099167-2 PCB (2): Signal Receiver PCB PCB (3): Buzzer PCB 2P099167-2 RTH1 2P099167-2 PCB (4): Display PCB LED1 LED2 2P099167-2 LED3 does not function. Printed Circuit Board Connector Wiring Diagram...
Page 24: Outdoor Unit
Outdoor Unit SiUS041111 2. Outdoor Unit 09/12 Class Connectors and PCB(1): Filter PCB Other Parts 1) S11 Connector for main PCB 2) AC1, AC2, S Connector for terminal board 3) E1, E2 Terminal for ground 4) HL2, HN2 Connector for main PCB 5) HR1 Connector for reactor 6) FU1...
Page 25 SiUS041111 Outdoor Unit PCB Detail PCB(1): Filter PCB E1, E2 3P257381-1 PCB(2): Main PCB LED A W V U 2P257375-2 Printed Circuit Board Connector Wiring Diagram...
Page 26: 15/18/24 Class
Outdoor Unit SiUS041111 15/18/24 Class Connectors and PCB (1): Filter PCB Other Parts 1) S11 Connector for [S10] on main PCB 2) HL1, HN1, S Connector for terminal board 3) E1, E2 Terminal for ground 4) HL2, HN2 Connector for [HL3] [HN3] on main PCB 5) HL4, HN4 Connector for [S12] on main PCB 6) FU1...
Page 27 SiUS041111 Outdoor Unit PCB Detail PCB (1): Filter PCB FU3 V2 HN4, HL4 HN2 HL2 E2, E1 3P273862-1 PCB (2): Main PCB LED A U, V, W 2P273854-1 Printed Circuit Board Connector Wiring Diagram...
Page 28: Function And Control
SiUS041111 Part 4 Function and Control 1. Main Functions..................21 1.1 Temperature Control .................. 21 1.2 Frequency Principle..................21 1.3 Airflow Direction Control................23 1.4 Fan Speed Control for Indoor Unit ............. 24 1.5 Program Dry Operation ................25 1.6 Automatic Operation................... 26 1.7 Thermostat Control..................
Page 29: Main Functions
SiUS041111 Main Functions 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 30 Main Functions SiUS041111 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 the DC power source for the present. The DC power source is reconverted into the three phase AC power source with variable frequency.
Page 31: Airflow Direction Control
SiUS041111 Main Functions Frequency Limits The following functions regulate the minimum and maximum frequency: Frequency Functions  Four-way valve operation compensation. Refer to page 37.  Compressor protection function. Refer to page 37. High  Discharge pipe temperature control. Refer to page 39. ...
Page 32: Fan Speed Control For Indoor Unit
Main Functions SiUS041111 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 33: Program Dry Operation
SiUS041111 Main Functions COMFORT 09/12 class  The fan speed is controlled automatically. AIRFLOW  The latest command has the priority between POWERFUL and COMFORT AIRFLOW. Operation 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.
Page 34: Automatic Operation
Main Functions SiUS041111 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 start-up, and automatically operates in that mode. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
Page 35: Thermostat Control
SiUS041111 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 the zone A. Thermostat ON Condition  The temperature difference returns to the zone C after being in the zone A. ...
Page 36: Night Set Mode
Main Functions SiUS041111 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 one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.
Page 37: Econo Operation
SiUS041111 Main Functions ECONO Operation 09/12 class The "ECONO operation" reduces the maximum operating current and the power consumption. This operation is particularly convenient for energy-saving-oriented users. It is also a major bonus for those whose breaker capacities do not allow the use of multiple electrical devices and air conditioners.
Page 38: Inverter Powerful Operation
Main Functions SiUS041111 1.10 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, operate the air conditioner by increasing the indoor fan rotating speed and the compressor frequency. Detail When POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
Page 39: Other Functions
SiUS041111 Main Functions 1.11 Other Functions 1.11.1 Hot-Start Function In order to prevent the cold air blast that normally comes when heating operation is started, the temperature of the indoor heat exchanger is detected, and either the airflow is stopped or is made very weak thereby carrying out comfortable heating of the room.
Page 40: Function Of Thermistor
Function of Thermistor SiUS041111 2. Function of Thermistor RKN09/12KEVJU RKN15/18/24KEVJU RXN09/12/15/18/24KEVJU Electronic Electronic expansion valve expansion valve Four-way valve Compressor Compressor (R14247) (R14721) (1) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe Exchanger temperature.
Page 41: Control Specification
SiUS041111 Control Specification 3. Control Specification Mode Hierarchy Outline There are two modes; the one is the normal operation mode and the other is the forced operation mode for installation and servicing. Detail For Cooling Only Model Air conditioner control mode Forced operation mode Forced cooling operation Power transistor test mode...
Page 42: Frequency Control
Control Specification SiUS041111 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 43 SiUS041111 Control Specification 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 44: Controls At Mode Changing / Start-Up
Control Specification SiUS041111 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.  09/12 class Detail Outdoor temperature ...
Page 45: Compressor Protection Function
SiUS041111 Control Specification 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 46 Control Specification SiUS041111  15/18/24 class (Hz) Frequency (sec.) Time (R13906) A (Hz) B (Hz) C (Hz) D (Hz) Cooling: 98, Heating: 96 E (seconds) F (seconds) G (seconds) H (seconds) Function and Control...
Page 47: Discharge Pipe Temperature Control
SiUS041111 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 48: Input Current Control
Control Specification SiUS041111 Input Current Control Outline The microcomputer calculates the input current during 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 49: Freeze-Up Protection Control
SiUS041111 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 50: Outdoor Fan Control
Control Specification SiUS041111 Outdoor Fan Control 1. Fan OFF delay when stopped The outdoor fan is turned OFF 70 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 51: Defrost Control
SiUS041111 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 52 Control Specification SiUS041111  15/18/24 class The judgment is made with outdoor heat exchanger temperature. (6 ~ 30°C, 42.8 ~ 86°F) 76 Hz PI control Frequency 0 Hz 50 sec. 120 ~ 570 sec. 40 sec. Compressor Four way valve 8 sec.
Page 53: Electronic Expansion Valve Control
SiUS041111 Control Specification 3.11 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Open Control 1.
Page 54: Pressure Equalizing Control
Control Specification SiUS041111 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 55 SiUS041111 Control Specification 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 56: Malfunctions
Control Specification SiUS041111 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 57: Operation Manual
SiUS041111 Part 5 Operation Manual 1. System Configuration................50 2. 09/12 Class ....................51 2.1 Remote Controller ..................51 2.2 AUTO · DRY · COOL · HEAT · FAN Operation .......... 53 2.3 Adjusting the Airflow Direction and Rate ............ 55 2.4 COMFORT AIRFLOW Operation ............... 57 2.5 POWERFUL Operation ................
Page 58: System Configuration
System Configuration SiUS041111 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 59: 12 Class
SiUS041111 09/12 Class 2. 09/12 Class Remote Controller Name of Parts Remote Controller Signal transmitter Display (LCD) • Displays the current settings. Receiver (In this illustration, each section is shown with all its displays on for the purpose of explanation.) •...
Page 60 09/12 Class SiUS041111  Open the front cover MODE selector button • Selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 11 ECONO button • ECONO operation. Page 17 COMFORT button • COMFORT AIRFLOW operation. Page 15 SWING button • Adjusting the airflow direction. Page 13 OFF TIMER button Page 18...
Page 61: Auto · Dry · Cool · Heat · Fan Operation
SiUS041111 09/12 Class 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 62: Operating Conditions
09/12 Class SiUS041111  To change the temperature setting Press • The displayed items on the LCD will change whenever either one of the buttons is pressed. COOL operation HEAT operation AUTO operation DRY or FAN operation 64-86˚F 64-90˚F 50-86˚F (18-30˚C) (18-32˚C) (10-30˚C)
Page 63: Adjusting The Airflow Direction And Rate
SiUS041111 09/12 Class Adjusting the Airflow Direction and Rate Adjusting the Airflow Direction and Rate You can adjust the airflow direction to increase your comfort.  To start auto swing Upper and lower airflow direction Press • “ ” is displayed on the LCD. •...
Page 64 09/12 Class SiUS041111  To adjust the airflow rate setting Press • Each pressing of advances the airflow rate setting in sequence. Auto Indoor unit quiet Middle low High Middle high Middle • When the airflow is set to “ ”, indoor unit quiet operation will start and the noise from the unit will become quieter.
Page 65: Comfort Airflow Operation
SiUS041111 09/12 Class 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 66: Powerful Operation
09/12 Class SiUS041111 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 67: Econo Operation
SiUS041111 09/12 Class 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 68: Off Timer Operation
09/12 Class SiUS041111 OFF TIMER Operation OFF 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 69: On Timer Operation
SiUS041111 09/12 Class ON TIMER Operation ON TIMER Operation  To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. Press “ ” is displayed on the LCD. “ ”...
Page 70: 18/24 Class
15/18/24 Class SiUS041111 3. 15/18/24 Class Remote Controller Name of Parts Remote Controller Signal transmitter Display (LCD) Receiver • Displays the current settings. (In this illustration, each section is shown with all its displays on for the • To use the remote controller, aim the purpose of explanation.) transmitter at the indoor unit.
Page 71 SiUS041111 15/18/24 Class  Open the front cover MODE selector button • Selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 11 SWING button • Adjusting the airflow direction. Page 13 OFF TIMER button Page 16 ON TIMER button Page 17 TIMER CANCEL button •...
Page 72: Auto · Dry · Cool · Heat · Fan Operation
15/18/24 Class SiUS041111 AUTO · DRY · COOL · HEAT · FAN Operation AUTO · DRY · COOL · HEAT · FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. ...
Page 73 SiUS041111 15/18/24 Class  To change the temperature setting Press • The displayed items on the LCD will change whenever either one of the buttons is pressed. COOL operation HEAT operation AUTO operation DRY or FAN operation 64-90˚F 50-86˚F 64-86˚F (18-32˚C) (10-30˚C) (18-30˚C)
Page 74: Adjusting The Airflow Direction And Rate
15/18/24 Class SiUS041111 Adjusting the Airflow Direction and Rate Adjusting the Airflow Direction and Rate You can adjust the airflow direction to increase your comfort.  To start auto swing Upper and lower airflow direction Press • “ ” is displayed on the LCD. •...
Page 75 SiUS041111 15/18/24 Class  To adjust the airflow rate setting Press • Each pressing of advances the airflow rate setting in sequence. Auto Indoor unit quiet Middle low High Middle high Middle • When the airflow is set to “ ”, indoor unit quiet operation will start and the noise from the unit will become quieter.
Page 76: Powerful Operation
15/18/24 Class SiUS041111 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 77: Off Timer Operation
SiUS041111 15/18/24 Class OFF TIMER Operation OFF 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 78: On Timer Operation
15/18/24 Class SiUS041111 ON TIMER Operation ON TIMER Operation  To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. Press “ ” is displayed on the LCD. “ ”...
Page 79: Service Diagnosis
SiUS041111 Part 6 Service Diagnosis 1. Troubleshooting with LED .................73 1.1 Indoor Unit....................73 1.2 Outdoor Unit ....................73 2. Problem Symptoms and Measures ............74 3. Service Check Function ................75 4. Troubleshooting ..................78 4.1 Error Codes and Description ..............78 4.2 Indoor Unit PCB Abnormality ..............
Page 80 SiUS041111 5.11 Outdoor Fan System Check ..............124 5.12 Main Circuit Short Check................125 5.13 Power Module Check ................126 Service Diagnosis...
Page 81: Troubleshooting With Led
SiUS041111 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 82: Problem Symptoms And Measures
Problem Symptoms and Measures SiUS041111 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 83: Service Check Function
SiUS041111 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. <Open the front cover> Timer cancel button < ARC452 Series > (R14669) 2.
Page 84 Service Check Function SiUS041111 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 85 SiUS041111 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 86: Troubleshooting
Troubleshooting SiUS041111 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 87: Indoor Unit Pcb Abnormality
SiUS041111 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 88: Freeze-Up Protection Control Or Heating Peak-Cut Control
Troubleshooting SiUS041111 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 89 SiUS041111 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.116 Is there any short circuit? Provide sufficient air passage. Check the air filter.
Page 90: Fan Motor (Dc Motor) Or Related Abnormality
Troubleshooting SiUS041111 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 91 SiUS041111 Troubleshooting Troubleshooting FTXN09/12KEVJU Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.03 Note: The motor may break when the Turn off the power. motor connector is disconnected Refer to P.117 (Unplug the power cable or turn while remaining power supply.
Page 92 Troubleshooting SiUS041111 Troubleshooting FTXN15/18/24KVJU 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.117 and rotate the fan by hand. Does the fan Replace the indoor rotate smoothly? fan motor.
Page 93: Thermistor Or Related Abnormality (Indoor Unit)
SiUS041111 Troubleshooting 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 94: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)
Troubleshooting SiUS041111 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 95 SiUS041111 Troubleshooting 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 connection wires. Refer to P.118 Is there any wiring error? Correct the indoor unit - outdoor unit connection wires.
Page 96: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)
Troubleshooting SiUS041111 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 Malfunction indoor / outdoor transmission signal. Detection Malfunction The pair type and multi type are interconnected.
Page 97: Outdoor Unit Pcb Abnormality
SiUS041111 Troubleshooting 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 98: Ol Activation (Compressor Overload)
Troubleshooting SiUS041111 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 99: Compressor Lock
SiUS041111 Troubleshooting 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 100: Dc Fan Lock
Troubleshooting SiUS041111 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 about 15 seconds even when the fan motor is running. Malfunction ...
Page 101: Input Overcurrent Detection
SiUS041111 Troubleshooting 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 about 15 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 102: Four-Way Valve Abnormality
Troubleshooting SiUS041111 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 10 minutes after operating for 5 minutes.
Page 103 SiUS041111 Troubleshooting 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 Refer to P.116 Correct it. disconnected (loose)? Check No.13 Refer to P.119 Harness out of connector? Reconnect it.
Page 104: Discharge Pipe Temperature Control
Troubleshooting SiUS041111 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 A, the compressor Malfunction Decision stops.
Page 105 SiUS041111 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.116 Check No. 01 Replace the defective Check the thermistors. • Discharge pipe thermistor thermistor.
Page 106: High Pressure Control In Cooling
Troubleshooting SiUS041111 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 107 SiUS041111 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 installation space. Refer to P.116 Check No. 17 Check No.12 Change the installation Check the installation Refer to P.118 condition.
Page 108: Compressor System Sensor Abnormality
Troubleshooting SiUS041111 4.16 Compressor System Sensor Abnormality Remote Controller Display  The system checks the DC current before the compressor starts. Method of Malfunction Detection  The DC current before compressor start-up is out of the range 0.5 - 4.5 V (sensor output Malfunction Decision converted to voltage value)
Page 109: Position Sensor Abnormality
SiUS041111 Troubleshooting 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  The compressor fails to start in about 15 seconds after the compressor run command signal is Malfunction Decision sent.
Page 110 Troubleshooting SiUS041111 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 No.15 Refer to P.120 Check the power supply voltage. Check No.18 Refer to P.124 Voltage as rated? Correct the power supply.
Page 111: Dc Voltage / Current Sensor Abnormality (09/12 Class Only)
SiUS041111 Troubleshooting 4.18 DC Voltage / Current Sensor Abnormality (09/12 Class Only) Remote Controller Display Method of DC voltage or DC current sensor abnormality is identified based on the compressor running frequency and the input current. Malfunction Detection  The compressor running frequency is above 52 Hz. Malfunction Decision (The input current is also below 0.1 A.)
Page 112: Thermistor Or Related Abnormality (Outdoor Unit)
Troubleshooting SiUS041111 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 113 SiUS041111 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.116 Turn on the power again. Error displayed Reconnect the connectors again on remote or thermistors.
Page 114: Electrical Box Temperature Rise
Troubleshooting SiUS041111 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 115 SiUS041111 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.123 the outdoor fan starts when the radiation fin temperature rises above C and stops when it drops...
Page 116: Radiation Fin Temperature Rise
Troubleshooting SiUS041111 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 117 SiUS041111 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.123 again to start the system. Check No.19 Refer to P.124 Error displayed again?
Page 118: Output Overcurrent Detection
Troubleshooting SiUS041111 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 119 SiUS041111 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 wiring again.
Page 120: Refrigerant Shortage
Troubleshooting SiUS041111 4.23 Refrigerant Shortage Remote Controller Display Method of Refrigerant shortage detection I: Refrigerant shortage is detected by checking the input current value and the compressor running Malfunction 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 the...
Page 121 SiUS041111 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.116 Any thermistor Replace them in position. disconnected? ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗...
Page 122: Low-Voltage Detection Or Over-Voltage Detection
Troubleshooting SiUS041111 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 123 SiUS041111 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 124: Check
Check SiUS041111 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 125: Fan Motor Connector Output Check
SiUS041111 Check Fan Motor Connector Output Check Check No.02 FTXN15/18/24KVJU 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 126: Power Supply Waveforms Check
Check SiUS041111 Power Supply Waveforms Check Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance.  Check to see if the power supply waveform is a sine wave. (Fig.1) ...
Page 127: Four-Way Valve Performance Check
SiUS041111 Check 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 S80 voltage at 208 - 230 VAC with Replace the outdoor unit compressor on? (Fig.
Page 128: Inverter Checker" Check
Check SiUS041111 “Inverter Checker” Check  Characteristics Check No.15 If an 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 129 SiUS041111 Check Step 3 09/12 class: Activate power transistor test operation from indoor unit. 1) Turn the power on. 2) Select FAN operation with the [MODE] button on the remote controller. 3) Press the 3 buttons (TEMP , TEMP , MODE) simultaneously. ...
Page 130: Rotation Pulse Check On The Outdoor Unit Pcb
Check SiUS041111 Rotation Pulse Check on the Outdoor Unit PCB Check No.16 09/12 class 1. Check that the voltage between the pins 10 - 11 is 15 VDC. 2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 -12, 10 - 13, when the fan motor is manually rotated once.
Page 131: Installation Condition Check
SiUS041111 Check 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 132: Discharge Pressure Check
Check SiUS041111 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 133: Main Circuit Short Check
SiUS041111 Check 5.12 Main Circuit Short Check Check No.20 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V before checking.  Measure the resistance between the pins of the DB1 as below. ...
Page 134: Power Module Check
Check SiUS041111 15/18/24 class – Tester (R14433) 5.13 Power Module Check Check No.22 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V before checking.  Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.
Page 135: Removal Procedure
SiUS041111 Part 7 Removal Procedure 1. Indoor Unit: 09/12 Class................128 1.1 Removal of Air Filters ................128 1.2 Removal of Horizontal Blade..............130 1.3 Removal of Front Panel................132 1.4 Removal of Front Grille ................133 1.5 Removal of Electrical Box / Vertical Blades ..........134 1.6 Removal of Swing Motor / PCBs ..............
Page 136: Indoor Unit: 09/12 Class
Indoor Unit: 09/12 Class SiUS041111 1. Indoor Unit: 09/12 Class Removal of Air Filters Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Appearance features Warning Dangerous: High voltage A high voltage is applied to all...
Page 137 SiUS041111 Indoor Unit: 09/12 Class Step Procedure Points Pull out the air filter downward and remove (R11620) 3. Remove the Titanium apatite photocatalytic air-purifying filters. Air filter The Titanium apatite photocatalytic air- Titanium apatite purifying filter is photocatalytic attached to the back of air-purifying filter the air filter.
Page 138: Removal Of Horizontal Blade
Indoor Unit: 09/12 Class SiUS041111 Removal of Horizontal Blade 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 horizontal blade. Horizontal blade (R11622)  The center shaft can be Unfasten the center shaft while bending the released easily by bending the...
Page 139 SiUS041111 Indoor Unit: 09/12 Class Step Procedure Points Remove the horizontal blade. (R11626) Removal Procedure...
Page 140: Removal Of Front Panel
Indoor Unit: 09/12 Class SiUS041111 Removal of Front Panel 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 front panel Right side over the position where Front panel it stops.
Page 141: Removal Of Front Grille
SiUS041111 Indoor Unit: 09/12 Class Removal of Front Grille 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 2 screws, Front grille which fix the front grille to the main body.
Page 142: Removal Of Electrical Box / Vertical Blades
Indoor Unit: 09/12 Class SiUS041111 Removal of Electrical Box / Vertical Blades Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Disconnect the connecting Preparation Service cover ...
Page 143 SiUS041111 Indoor Unit: 09/12 Class Step Procedure Points  Connecting wires Loosen the screws of Terminal board the terminal board and black (1) ----- power supply disconnect the white (2) ----- power supply connecting wires. (3) ----- transmission yellow / green ( ----- ground Connecting wires...
Page 144 Indoor Unit: 09/12 Class SiUS041111 Step Procedure Points Disconnect the [S200] connector for the fan motor [S200]. Hook Release the fan motor harnesses from the hook. (R14602) (R11642) Remove the screw of the electrical box. (R11643) Slide the electrical box to the right first and detach the horizontal blade from the electrical...
Page 145 SiUS041111 Indoor Unit: 09/12 Class Step Procedure Points  Narrow the edges of the hook to 3. Remove the vertical blade Hook assembly. unfasten it. Unfasten the right and Hook left hooks of the fan Hook guard with pliers. (R11646) (R14608) Fan guard ...
Page 146 Indoor Unit: 09/12 Class SiUS041111 Step Procedure Points Unfasten the 3 hooks at the shaft mounting part by pressing them with a flat screwdriver. Hook (R8022)  Repeat the same procedure to Remove the vertical blade assembly. remove the vertical blade assembly on the other side.
Page 147: Removal Of Swing Motor / Pcbs
SiUS041111 Indoor Unit: 09/12 Class Removal of Swing Motor / PCBs 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 shield plate Preparation Shield plate (2) ...
Page 148 Indoor Unit: 09/12 Class SiUS041111 Step Procedure Points  The connector of the swing Unfasten the hook, and disconnect the motor has a hook. connector. Press the hook with a flat screwdriver to unfasten it. (R8037) (R11651) 3. Remove the display PCB. Unfasten the hook, and release the display PCB assembly.
Page 149 SiUS041111 Indoor Unit: 09/12 Class Step Procedure Points Disconnect the connector [S27] from the display PCB. The figure shows the [S27]: for control PCB component parts of the [S27] display PCB. Operation lamp ON/OFF button (Forced cooling operation ON/OFF button) Signal receiver TIMER lamp (R14604)
Page 150 Indoor Unit: 09/12 Class SiUS041111 Step Procedure Points Disconnect the 1 : black, upper terminals from the 2 : white, lower terminal board with 3 : red, upper pliers. : green without sleeve, upper green with sleeve, lower (R11656) Release the 4 hooks. Hook Lift up the upper part of the control PCB and...
Page 151: Removal Of Indoor Heat Exchanger
SiUS041111 Indoor Unit: 09/12 Class 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. Step Procedure Points 1. Disconnect the refrigerant Preparation  Remove the electrical box piping.
Page 152 Indoor Unit: 09/12 Class SiUS041111 Step Procedure Points Disconnect the flare nut for liquid piping with 2 wrenches. (R8018) 2. Remove the indoor heat exchanger. Remove the indoor unit from the installation plate. Liquid piping Gas piping (R8019) Unfasten the hook of the piping fixture on the Auxiliary piping Piping fixture...
Page 153 SiUS041111 Indoor Unit: 09/12 Class Step Procedure Points Widen the auxiliary piping to the extent of Auxiliary piping 10° ~ 20°. Remove the screw on the left side and Caution Hook Hook unfasten the hook on When removing or reassembling the rear side.
Page 154: Removal Of Fan Rotor / Fan Motor
Indoor Unit: 09/12 Class SiUS041111 Removal of Fan Rotor / 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 1. Remove the right side Preparation ...
Page 155 SiUS041111 Indoor Unit: 09/12 Class Step Procedure Points 2. Remove the fan rotor and the fan motor. Fan rotor The fan motor has 3 projections on the right side. Fan motor The fan rotor has a rotating shaft on the left side.
Page 156 Indoor Unit: 09/12 Class SiUS041111 Step Procedure Points Unfasten the 2 hooks of the motor cover. Hook Motor cover (R8051)  The magnet of the fan motor is Pull out the fan motor from the fan rotor to united with the fan rotor. Be Fan motor Magnet Coil...
Page 157: Exchange Of Piping Direction (Drain Hose)
SiUS041111 Indoor Unit: 09/12 Class Exchange of Piping Direction (Drain Hose) 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 heat insulation fixing screw Drain hose on the right side and remove the drain hose.
Page 158: Indoor Unit: 15/18/24 Class
Indoor Unit: 15/18/24 Class SiUS041111 2. Indoor Unit: 15/18/24 Class 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. Step Procedure Points Warning Dangerous: High voltage A high voltage is applied to all...
Page 159 SiUS041111 Indoor Unit: 15/18/24 Class Step Procedure Points 2. Remove the Titanium apatite photocatalytic air- purifying filters.  The right and left filters are Push up the bottom of the Titanium apatite interchangeable. photocatalytic air- Hook purifying filter to unfasten the hooks (2 on lower, 3 on upper) and take the filter out.
Page 160 Indoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points 3. Remove the front panel. While opening the front panel further than it stops, release both the shafts and remove the front panel.  Slide the front panel from side to side to release each shaft. ...
Page 161: Removal Of Front Grille
SiUS041111 Indoor Unit: 15/18/24 Class Removal of Front Grille 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 service cover. Preparation  Remove the front panel Remove the screw and according to "Removal of the Air remove the service...
Page 162: Part
Indoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points  The convex marks (...) on the Unfasten the 3 hooks on the top of the front front panel indicate the position Hook grille. of the hooks. (R2759) Hook (R2760)  Make sure that all the 3 hooks Pull the upper part of the front grille out and are engaged securely when...
Page 163: Removal Of Horizontal Blades / Vertical Blades
SiUS041111 Indoor Unit: 15/18/24 Class Removal of Horizontal Blades / Vertical Blades 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. Open the horizontal blades.
Page 164 Indoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points  Remove the fan guards 2. Remove the vertical blades. beforehand.  The unit has 3 sets of vertical Release the right and blades linked one another with left shafts. Vertical blade interlock rods.
Page 165: Removal Of Electrical Box / Pcbs / Swing Motors
SiUS041111 Indoor Unit: 15/18/24 Class Removal of Electrical Box / PCBs / 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 electrical box. Preparation ...
Page 166 Indoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points  You can remove the electrical Remove the screw and Terminal board remove the terminal box without detaching the board. terminal board.  Screw: M4 × 30 (R2773) Disconnect the [S1] connector for the fan motor [S1].
Page 167 SiUS041111 Indoor Unit: 15/18/24 Class Step Procedure Points  The electrical box has a hook on Dislocate the electrical box to the left and its back. unfasten the back hook.  Catch the back hook of the Pull the electrical box out.
Page 168 Indoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Press the signal receiver unit down and unfasten the hooks on the upper side, and then unfasten the hooks on the lower side. Signal receiver unit (R14255) Cut the clamp.  Remove the signal receiver unit The signal receiver unit Signal receiver PCB Display PCB...
Page 169 SiUS041111 Indoor Unit: 15/18/24 Class Step Procedure Points Unfasten the 2 hooks on the lower side, and then the 2 hooks on the Upper hook upper side. Remove the control PCB. Control PCB Lower hook (R2785) [S1]: DC fan motor [S6]: swing motor for horizontal blades [S1]...
Page 170: Removal Of Indoor Heat Exchanger
Indoor Unit: 15/18/24 Class SiUS041111 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. Step Procedure Points 1. Disconnect the refrigerant Preparation  Remove the electrical box piping.
Page 171 SiUS041111 Indoor Unit: 15/18/24 Class Step Procedure Points 2. Remove the indoor unit. Remove the indoor unit from the installation plate. 3. Remove the indoor heat exchanger. Unfasten the hook of the piping fixture at the back of the indoor unit and pull out the piping.
Page 172 Indoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Unfasten the hooks on Caution the left side. When removing or reassembling the indoor heat exchanger, be sure to wear protective gloves or wrap the indoor heat exchanger with cloths or you may be injured by the fins.
Page 173: Removal Of Fan Motor / Fan Rotor
SiUS041111 Indoor Unit: 15/18/24 Class Removal of Fan Motor / Fan Rotor 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 right side plate.
Page 174 Indoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points  When reassembling the fan Remove the fan motor. motor and 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. Fan motor Side face of (R12897)
Page 175: Outdoor Unit: 09/12 Class
SiUS041111 Outdoor Unit: 09/12 Class 3. Outdoor Unit: 09/12 Class Note: The illustrations are for heat pump models as representative. Removal of Outer Panels Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.
Page 176 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Remove the 3 screws Top panel (right: 1 screw, left: 2 screws) and remove the top panel. Remove the 5 screws of the front panel. Front panel (R11745) Lift up the left side and unfasten the hooks.
Page 177 SiUS041111 Outdoor Unit: 09/12 Class Step Procedure Points Remove the 4 screws Discharge grille of the discharge grille. Unfasten the 6 hooks and remove the discharge grille. (R11748) 3. Remove the shield plate and the conduit. Remove the 2 screws. (R11749) Remove the shield plate.
Page 178 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Remove the 2 screws. (R11751) Remove the conduit. Conduit (R11752) Remove the conduit mounting plate. Conduit mounting plate (R11753) Removal Procedure...
Page 179: Removal Of Outdoor Fan / Fan Motor
SiUS041111 Outdoor Unit: 09/12 Class Removal of Outdoor Fan / 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 1. Remove the outdoor fan. Preparation Mark ...
Page 180 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points  When reassembling, put the fan Remove the screw and Fan motor fixing frame remove the fan motor motor lead wire through the fixing frame. back of the fan motor so as not to be entangled with the outdoor fan.
Page 181: Removal Of Electrical Box / Pcb
SiUS041111 Outdoor Unit: 09/12 Class Removal of Electrical Box / PCB 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 right side Preparation ...
Page 182 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Remove the 4 screws on the right side panel. (R11762)  When reassembling, make sure Unfasten the hook on Hook the rear side. to fit the hook. (R11763) Unfasten the hook, and remove the right side panel.
Page 183 SiUS041111 Outdoor Unit: 09/12 Class Step Procedure Points 2. Remove the thermistors.  Pay attention so as not to lose Release the discharge the fixture for thermistor. pipe thermistor.  When reassembling, do not insert the thermistor up to the dent of fixture.
Page 184 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Cut the clamp. (R11768) Release the harnesses. (R11769) Disconnect the [S90] : outdoor temperature [S90] connector for the thermistor, outdoor heat thermistors [S90]. exchanger thermistor, discharge pipe thermistor Remove the thermistor assembly. (R11770) Removal Procedure...
Page 185 SiUS041111 Outdoor Unit: 09/12 Class Step Procedure Points 3. Remove the electrical box. [S40] Disconnect the connector for the overload protector [S40]. (R11771)  The cooling only model has no Disconnect the connector for the harness for [S80]. four-way valve coil [S80].
Page 186 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Disconnect the relay connector for the compressor motor. (R11774) Release the harnesses from the hook. (R11775)  The electrical box can be Unfasten the hook of the electrical box from removed by lifting itself without the partition plate with a a screwdriver.
Page 187 SiUS041111 Outdoor Unit: 09/12 Class Step Procedure Points Lift and remove the electrical box. Electrical box (R11776) 4. Remove the control PCB. Disconnect the 2 Control PCB terminals of the reactor. Reactor White Brown (R11946) Remove the screw of the terminal board, and Terminal board pull out the terminals.
Page 188 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Cut the clamp. (R11780) Remove the 3 screws and remove the reactor. Reactor (R11777) Disconnect the 3 [S10] connectors for the filter PCB [S10], [HN3], [HL3]. [HN3] [HL3] (R11781) Removal Procedure...
Page 189 SiUS041111 Outdoor Unit: 09/12 Class Step Procedure Points Release the harnesses. (R11782) Remove the 6 screws. Control PCB (R10717) Unfasten the 2 hooks. Lift and remove the control PCB. (R11783) Removal Procedure...
Page 190 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Feature of the control [S10] [HN3] [HL3]: filter PCB [S10] [S90] [S20]: electronic expansion valve coil [S70] [S40]: overload protector [S70]: fan motor [S80]: four-way valve coil [S40] [S90]: thermistors [S20] [S80] [HL3] [HN3] (R11784)
Page 191 SiUS041111 Outdoor Unit: 09/12 Class Step Procedure Points Release the harnesses from the hook. (R11787) Remove the screw. (R11788) Removal Procedure...
Page 192 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Unfasten the 2 hooks. (R11789) Release the harnesses. (R11790) Remove the filter PCB. Filter PCB (R11791) Removal Procedure...
Page 193: Removal Of Sound Blankets
SiUS041111 Outdoor Unit: 09/12 Class 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 1. Remove the partition plate. Remove the 2 screws. (R11792) The partition plate has a hook on the lower...
Page 194 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points  Since the piping ports on the 2. Remove the sound blankets. sound blanket are torn easily, remove the blanket carefully. Lift and remove the sound blanket (top). Sound blanket (top) (R11794) Pull the sound blanket (outer and inner 2) out.
Page 195: Removal Of Four-Way Valve
SiUS041111 Outdoor Unit: 09/12 Class Removal of Four-Way Valve Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points  The cooling only model has no 1. Remove the peripheries. four-way valve coil.
Page 196 Outdoor Unit: 09/12 Class SiUS041111 Step Procedure Points Remove the electronic expansion valve coil. Electronic expansion valve coil (R11798) Remove the putty. (R11800) Removal Procedure...
Page 197 SiUS041111 Outdoor Unit: 09/12 Class 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 heating that are heated by the gas up the brazed part.
Page 198: Removal Of Compressor
Outdoor Unit: 09/12 Class SiUS041111 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 four-way valve, the terminal Warning cover and disconnect Be careful not to burn yourself the terminals of the with the pipes and other parts...
Page 199: Outdoor Unit: 15/18/24 Class
SiUS041111 Outdoor Unit: 15/18/24 Class 4. Outdoor Unit: 15/18/24 Class Note: The illustrations are for heat pump models as representative. Removal of Outer Panels Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.
Page 200 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Unfasten the right side hooks. (R14284)  When reassembling, fit the left Unfasten the left side hooks. side of the front panel first. Remove the front panel. (R14285) Remove the screw of the stop valve cover.
Page 201 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Pull down the stop valve cover to unfasten the hooks and remove it. (R14704)  The stop valve cover has 5 hooks. (R14705) Removal Procedure...
Page 202: Removal Of Outdoor Fan / Fan Motor
Outdoor Unit: 15/18/24 Class SiUS041111 Removal of Outdoor Fan / 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 Remove the shield Preparation Shield plate ...
Page 203 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points  The harnesses of [S70] and Release the fan [S20] motor lead wire from [S20] cross each other. the groove and the 2 hooks of the partition plate. (R14448) (R14304)  Nut size: M6 Remove the nut of Outdoor fan the outdoor fan.
Page 204 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Remove the screw of Fan motor fixing frame the fan motor fixing frame. (R14293) Pull down the fan motor fixing frame to unfasten the 2 hooks at the bottom. Hook (R14294) Remove the fan motor fixing frame.
Page 205 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Open the hook and release the fan motor lead wire. Hook (R14296) Remove the 4 screws and remove the fan Fan motor motor. (R14297) Removal Procedure...
Page 206: Removal Of Electrical Box
Outdoor Unit: 15/18/24 Class SiUS041111 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  When reassembling, pass the Remove the 2 screws Protection plate of the protection plate.
Page 207 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Remove the screws and remove the connecting wires. (R14299) Pull out the outdoor Outdoor temperature temperature thermistor. thermistor (R14300) Remove the 6 screws of the right side panel. Right side panel (R14301) Removal Procedure...
Page 208 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points  When reassembling, insert the 2 Unfasten the 2 lower hooks and the 1 upper lower hooks and the 1 upper hook. hook of the back. Remove the right side panel. Hook (R14303) Hook (R14736)
Page 209 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Peel off the filament tape. (R14288) Disconnect the [S70] connector for the fan motor [S70]. (R14289)  The cooling only models have Disconnect the [S80] connector for the no harness for [S80]. four-way valve coil [S80].
Page 210 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Pull out the clamp. (R14309) Disconnect the [S20] connector for the electronic expansion valve coil [S20]. (R14305) Pull out the clamp. (R14306) Remove the wire saddle. Wire saddle (R14307) Removal Procedure...
Page 211 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points  When reassembling, insert the Disconnect the [S40] connector for the clamps of harnesses as below. overload protector [S40] [S80] [S20] [S40]. (R14363)  When reassembling, connect the connectors in the following order.
Page 212 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Disconnect the [S90] connector for the thermistors [S90]. (R14314)  When reassembling, insert the Pull out the clamp. clamp as below. (R14315) Remove the wire saddle. [S90] (R14726) Wire saddle (R14316) Pull out the clamp. (R14317) Removal Procedure...
Page 213 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Remove the screw. (R14318)  When reassembling, insert the 2 Pull out the 2 clamps at the bottom of the clamps of the thermistor electrical box. assembly into the holes as below. (R14727) (R14320) Remove the electrical...
Page 214: Removal Of Pcbs
Outdoor Unit: 15/18/24 Class SiUS041111 Removal of PCBs 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 main PCB. [S12]: for [HL4] [HN4] on filter PCB Main PCB Disconnect the [S12]...
Page 215 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points  When reassembling, insert the Pull out the clamp. clamp as below. [HL2] (blue) [HN2] (white) (R14325) (R14728) Remove the 2 upper screws. (R14326) Remove the 1 lower screw. (R14327) Removal Procedure...
Page 216 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Lift the main PCB Main PCB Assembly assembly. (R14328) Unfasten the 4 hooks at the bottom. (R14329) Remove the 8 screws. (R14330) Removal Procedure...
Page 217 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Unfasten the 2 hooks.  Refer to page 19 for detail. (R14331) Remove the main PCB. [S10]: filter PCB [S80] [S70] [S20] [S40] [S90] [S12]: filter PCB [S10] [S12] [S20]: electronic expansion valve coil [S40]: overload protector [S70]: fan motor...
Page 218 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points 3. Remove the filter PCB. Remove the ground screw. Ground (R14735) Pull out the terminals (1): black (1) (2) (3) from the terminal board. (2): white (3): red Terminal board (R14336) Pull out the clamp. (R14337) Release the harnesses from the groove.
Page 219 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Remove the 2 screws. (R14365) Unfasten the 3 hooks of the filter PCB assembly. (R14366) (R14367) Remove the 1 screw. (R14368) Removal Procedure...
Page 220 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points Unfasten the 2 hooks. (R14369)  Refer to page 19 for detail. Remove the filter PCB. (R14370) Removal Procedure...
Page 221: Removal Of Sound Blankets
SiUS041111 Outdoor Unit: 15/18/24 Class 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 1. Remove the partition plate. Remove the 2 screws. (R14371) Pull out the clamp from Partition plate...
Page 222 Outdoor Unit: 15/18/24 Class SiUS041111 Step Procedure Points  Since the piping ports are torn 2. Remove the sound Discharge pipe blankets. easily, remove the sound temperature thermistor blanket carefully. Release the discharge pipe temperature  Be careful not to lose the clip for thermistor.
Page 223 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Remove the sound blanket (side-outer). Sound blanket (side-outer) (R14347) Remove the sound blanket (side-inner). Sound blanket (side-inner) (R14348) Removal Procedure...
Page 224: Removal Of Electronic Expansion Valve Assemblyassy
Outdoor Unit: 15/18/24 Class SiUS041111 Removal of Electronic Expansion Valve Assembly Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Pull out the electronic Electronic expansion valve coil expansion valve coil.
Page 225: Removal Of Four-Way Valve
SiUS041111 Outdoor Unit: 15/18/24 Class Removal of Four-Way Valve Removal of Four Way Valve 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 and remove the four-way Warning Four-way...
Page 226: Removal Of Compressor
Outdoor Unit: 15/18/24 Class SiUS041111 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 Terminal cover cover. (R14343) Disconnect the compressor lead wires Blue (W) and the overload...
Page 227 SiUS041111 Outdoor Unit: 15/18/24 Class Step Procedure Points Remove the 3 nuts of Cautions for restoration the compressor. 1. Restore the piping by non- oxidation brazing.  Before working, make 2. It is required to prevent carbonization of the oil inside sure that the refrigerant the four-way valve and gas is empty in the circuit.
Page 228: Trial Operation And Field Settings
SiUS041111 Part 8 Trial Operation and Field Settings 1. Pump Down Operation................221 2. Forced Cooling Operation ...............222 3. Trial Operation ..................223 4. Field Settings ..................224 4.1 Model Type Setting .................. 224 4.2 Temperature Display Switch ..............224 4.3 When 2 Units are Installed in 1 Room............225 4.4 Facility Setting Switch (cooling at low outdoor temperature)....
Page 229: Pump Down Operation
SiUS041111 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 230: Forced Cooling Operation
Forced Cooling Operation SiUS041111 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 231: Trial Operation
SiUS041111 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 232: Field Settings
Field Settings SiUS041111 4. Field Settings Model Type Setting ARC452A19, 20  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 233: When 2 Units Are Installed In 1 Room
SiUS041111 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 234: Facility Setting Switch (Cooling At Low Outdoor Temperature)
Field Settings SiUS041111 Facility Setting Switch (cooling at low outdoor temperature) Outline This function is limited only for facilities with air conditioning targeted toward equipment. Never use it in a residence or office where the space is occupied by people. ...
Page 235: Jumper Settings
SiUS041111 Field Settings Jumper Settings Jumper Function When connected When cut (factory set) JB (on indoor unit Fan speed setting Fan speed setting; Fan rpm is set to “0” <Fan stop> PCB) when compressor Remote controller stops for thermostat setting OFF.
Page 236: Application Of Silicon Grease To A Power Transistor And A Diode Bridge
Application of Silicon Grease to a Power Transistor and a Diode Bridge SiUS041111 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 237: Appendix
SiUS041111 Part 9 Appendix 1. Piping Diagrams..................230 1.1 Indoor unit ....................230 1.2 Outdoor Unit ..................... 231 2. Wiring Diagrams..................233 2.1 Indoor Unit....................233 2.2 Outdoor Unit ..................... 234 Appendix...
Page 238: Piping Diagrams
Piping Diagrams SiUS041111 1. Piping Diagrams Indoor unit FTXN09/12KEVJU INDOOR UNIT HEAT EXCHANGER 9/32CuT 3/16CuT THERMISTOR 9/32CuT ON HEAT EXCH. 9/32CuT CROSS FLOW FAN FIELD PIPING (1/4CuT) FAN MOTOR FIELD PIPING 3/8CuT (3/8CuT) REFRIGERANT FLOW COOLING HEATING 4D066211A FTXN15/18/24KVJU INDOOR UNIT ( 5/16CuT ) HEAT EXCHANGER THERMISTOR...
Page 239: Outdoor Unit
SiUS041111 Piping Diagrams Outdoor Unit RKN09/12KEVJU OUTDOOR UNIT HEAT EXCHANGER 9/32CuT 9/32CuT MOTOR OPERATED VALVE 3/16CuT 1/4CuT 1/4CuT 3/16CuT MUFFLER WITH MOTOR FILTER PROPELLER FAN FIELD PIPING (1/4CuT) LIQUID STOP VALVE REFRIGERANT FLOW MUFFLER MUFFLER 3/8CuT FIELD PIPING DISCHARGE PIPE COOLING COMPRESSOR (3/8CuT)
Page 240 Piping Diagrams SiUS041111 RXN09/12KEVJU OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER 9/32CuT THERMISTOR 9/32CuT MOTOR OPERATED VALVE 3/16CuT 1/4CuT 1/4CuT 3/16CuT MUFFLER WITH MOTOR FILTER PROPELLER FAN 3/8CuT FOUR-WAY VALVE ON : HEATING FIELD PIPING (1/4CuT) LIQUID STOP VALVE REFRIGERANT FLOW MUFFLER MUFFLER 3/8CuT FIELD PIPING...
Page 241: Wiring Diagrams
SiUS041111 Wiring Diagrams 2. Wiring Diagrams Indoor Unit FTXN09/12KEVJU PCB 1 PCB 2 FIELD WIRING. TRANSMISSION GRN/YLW LED1 CIRCUIT LED2 RECTIFIER OUTDOOR – MR10 CAUTION NOTE THAT OPERATION WILL t˚ 3.15A RESTART AUTOMATICALLY IF – THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK IPM200 SIGNAL...
Page 242: Outdoor Unit
Wiring Diagrams SiUS041111 Outdoor Unit RKN09/12KEVJU, RXN09/12KEVJU FIELD WIRING indoor outdoor IN CASE OF NOTE IN CASE OF HEAT PUMP 1.REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. COOLING ONLY TYPE TYPE C5 , C6, C119 : CAPACITOR DB1 , DB2 , DB3 : DIODE BRIDGE (OUTDOOR) (DISCHARGE)
Page 244 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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Daikin FTXN09KEVJU Service Manual

Safety Consideration

Part 1

List of Functions

Part 2

Specifications

Part 3

Printed Circuit Board Connector Wiring Diagram

Part 4

Function and Control

Part 5

Operation Manual

Part

Part 6

Service Diagnosis

Part 7

Removal Procedure

Trial Operation and Field Settings

Part 9

Appendix

Quick Links

Troubleshooting

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Summary of Contents for Daikin FTXN09KEVJU