Safety Considerations SiUS12-928_B 1. Safety Considerations Read these SAFETY CONSIDERATIONS carefully before • Use only pipes, flare nuts, tools, and other materials performing any repair work. Comply with these safety symbols designed specifically for R410A refrigerant systems. without fail.Meanings of DANGER, WARNING, CAUTION, Never use tools or materials designed for R22 and NOTE Symbols: refrigerant systems on an R410A refrigerant system.
SiUS12-928_B Safety Considerations • Do not repair the electrical components with wet • Do not damage or modify the power cable. Damaged hands. Working on the equipment with wet hands may or modified power cables may cause an electrical cause an electrical shock. shock or fire.
SiUS12-928_B Indoor Unit 1. Indoor Unit CTXS, FTXS Series 60 Hz, 208 - 230 V CTXS07JVJU Model Cooling Heating Rated Capacity 7 kBtu/h Class Front Panel Color White 388 (11.0) 400 (11.3) Airflow Rate 335 (9.5) 357 (10.1) (m³/min) 283 (8.0) 314 (8.9) Type Cross Flow Fan...
Page 17
Indoor Unit SiUS12-928_B 60 Hz, 230 V FTXS15HVJU FTXS18HVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class Front Panel Color White White 519 (14.7) 515 (14.6) 549 (15.5) 609 (17.2) Airflow Rate 436 (12.3) 459 (13.0) 476 (13.5) 529 (15.0) (m³/min)
Page 18
SiUS12-928_B Indoor Unit 60 Hz, 208 - 230 V FTXS09LVJU FTXS12LVJU Model Cooling Heating Cooling Heating Rated Capacity 9 kBtu/h Class 12 kBtu/h Class Front Panel Color White White 381 (10.8) 420 (11.9) 403 (11.4) 438 (12.4) 279 (7.9) 321 (9.1) 307 (8.7) 335 (9.5) Airflow Rate...
Page 19
Indoor Unit SiUS12-928_B CDXS, FDXS Series 60 Hz, 230 V FDXS09DVJU FDXS12DVJU Model Cooling Heating Cooling Heating Rated Capacity 9 kBtu/h Class 12 kBtu/h Class External Static Pressure inAq (Pa) 0.12 (30) 0.12 (30) 305 (8.6) 305 (8.6) 305 (8.6) 305 (8.6) Airflow Rate 280 (7.9)
Page 20
SiUS12-928_B Indoor Unit 60 Hz, 208 - 230 V CDXS15LVJU CDXS18LVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class External Static Pressure inAq (Pa) 0.16 (40) 0.16 (40) 424 (12.0) 424 (12.0) 424 (12.0) 424 (12.0) 388 (11.0) 388 (11.0) 388 (11.0)
Outdoor Unit SiUS12-928_B 2. Outdoor Unit 60 Hz, 208 - 230 V 2MXS18GVJU Model Cooling Heating Casing Color Ivory White Type Hermetically Sealed Swing Type Compressor Model 2YC45EXD Motor Output 1,380 Model FVC50K Refrigerant Oil Charge oz (L) 26.5 (0.75) Type R-410A Refrigerant...
Page 22
SiUS12-928_B Outdoor Unit 60 Hz, 208 - 230 V 3MXS24JVJU Model Cooling Heating Casing Color Ivory White Type Hermetically Sealed Swing Type Compressor Model 2YC63EXD Motor Output 1,920 Model FVC50K Refrigerant Oil Charge oz (L) 26.5 (0.75) Type R-410A Refrigerant Charge 6.61 (3.0) (kg)
Page 23
Outdoor Unit SiUS12-928_B 60 Hz, 208 - 230 V 4MXS32GVJU Model Cooling Heating Casing Color Ivory White Type Hermetically Sealed Swing Type Compressor Model 2YC63EXD Motor Output 1,920 Model FVC50K Refrigerant Oil Charge oz (L) 26.5 (0.75) Type R-410A Refrigerant Charge 6.83 (3.1) (kg)
Indoor Unit SiUS12-928_B 1. Indoor Unit CTXS07JVJU, CTXS09/12HVJU, FTXS15/18HVJU Connectors and PCB (1): Control PCB Other Parts 1) S1 Connector for fan motor 2) S6 Connector for swing motor (horizontal blades) 3) S8 Connector for swing motor (vertical blades) 4) S21 Connector for centralized control (HA) 5) S26 Connector for buzzer PCB...
Page 26
SiUS12-928_B Indoor Unit PCB Detail PCB (1): Control PCB LED A 2P099167-1 PCB (2): Signal Receiver PCB PCB (3): Buzzer PCB 2P099167-1 RTH1 2P099167-1 PCB (4): Display PCB PCB (5): INTELLIGENT EYE Sensor PCB LED1 LED2 LED3 2P099167-1 3P099913-1 Printed Circuit Board Connector Wiring Diagram...
Indoor Unit SiUS12-928_B CTXS07LVJU, FTXS09/12LVJU 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 28
SiUS12-928_B Indoor Unit PCB Detail PCB (1): Control PCB LED A 2P206687-4 Printed Circuit Board Connector Wiring Diagram...
SiUS12-928_B Indoor Unit FTXS15/18LVJU 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 31
Indoor Unit SiUS12-928_B PCB Detail PCB (1): Control PCB (3.15A) LED A 2P227881-6 Printed Circuit Board Connector Wiring Diagram...
Indoor Unit SiUS12-928_B FDXS09/12DVJU Connectors and PCB (1): Control PCB Other Parts 1) S1 Connector for fan motor 2) S7 Connector for fan motor (Hall IC) 3) S21 Connector for centralized control (HA) 4) S26 Connector for display PCB 5) S32 Connector for indoor heat exchanger thermistor 6) H1, H2, H3 Connector for terminal board...
Page 34
SiUS12-928_B Indoor Unit PCB Detail PCB (1): Control PCB LED A 2P131149-1 PCB (2): Display PCB LED3 LED2 RTH1 LED1 2P084375-1 Printed Circuit Board Connector Wiring Diagram...
Indoor Unit SiUS12-928_B FDXS09/12LVJU, CDXS15/18LVJU Connectors and A1P: Control PCB Other Parts 1) S1 Connector for AC fan motor 2) S7 Connector for AC fan motor (Hall IC) 3) S21 Connector for centralized control (HA) 4) S26 Connector for display PCB 5) S32 Connector for indoor heat exchanger thermistor 6) H1, H2, H3...
Page 36
SiUS12-928_B Indoor Unit PCB Detail A1P: Control PCB LED A 2P292535-1 A2P: Display PCB LED3 LED2 RTH1 2P084375-1 LED 1 does not function. Printed Circuit Board Connector Wiring Diagram...
Outdoor Unit SiUS12-928_B 2. Outdoor Unit 2MXS18GVJU Connectors and Main PCB Other Parts 1) S10 Connector for MID1 (indoor - outdoor transmission) 2) S15 Connector for COOL / HEAT mode lock Refer to page 262 for detail. 3) S20 (white) Connector for electronic expansion valve coil A port 4) S21 (red) Connector for electronic expansion valve coil B port...
Page 38
SiUS12-928_B Outdoor Unit MID2 (Inverter PCB) 1) S34, S72 Connector for main PCB 2) S70 Connector for outdoor fan motor 3) FU201 Fuse (3.15 A, 250 V) 4) W, V, U, N Connector for compressor 1) CN11, CN14 Connector for main PCB 2) L1, L2 Connector for reactor PCB Detail...
SiUS12-928_B Outdoor Unit 3MXS24JVJU, 4MXS32GVJU Connectors and PCB (1): Main PCB Other Parts 1) S10 Connector for terminal board (indoor - outdoor transmission) 2) S15 Connector for COOL / HEAT mode lock Refer to page 262 for detail. 3) S20 (white) Connector for electronic expansion valve coil A port 4) S21 (red) Connector for electronic expansion valve coil B port...
Page 41
Outdoor Unit SiUS12-928_B PCB Detail PCB (1): Main PCB (brown) E1 E2 V100 (white) (blue) (blue) S101 2P209947-1 2P209947-2 PCB (2): Service Monitor PCB LED3 LED1 LED4 LED2 LED A S102 3P165332-1 Printed Circuit Board Connector Wiring Diagram...
SiUS12-928_B Part 4 Function and Control 1. Main Functions..................35 1.1 Temperature Control .................. 35 1.2 Frequency Principle..................35 1.3 Airflow Direction Control (CTXS/FTXS Series) .......... 37 1.4 Fan Speed Control for Indoor Unit ............. 39 1.5 Program Dry Operation ................40 1.6 Automatic Operation...................
Main Functions SiUS12-928_B 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 44
SiUS12-928_B Main Functions Inverter Principle To regulate the capacity, a frequency control is needed. The inverter makes it possible to alter 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.
Main Functions SiUS12-928_B Frequency Limits The following functions regulate the minimum and maximum frequency: Frequency Functions Four-way valve operation compensation. Refer to page 57. Compressor protection function. Refer to page 58. High Discharge pipe temperature control. Refer to page 58. ...
Page 46
SiUS12-928_B Main Functions FTXS15/18LVJU Vertical Swing (up and down) Horizontal Swing (right and left) Cooling / Dry Heating 15˚ 15˚ 30˚ 25˚ 25˚ 40˚ 75˚ 75˚ 50˚ 60˚ 70˚ 70˚ (R9306) (R9304) (R9305) (R9303) 3-D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform air-conditioning of the entire room.
Main Functions SiUS12-928_B 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.
SiUS12-928_B Main Functions Note: 1. During POWERFUL operation, the fan rotates at H tap + 50 ~ 90 rpm. 2. The fan stops during defrost operation. COMFORT CTXS/FTXS-L Series The fan speed is controlled automatically within the following steps. AIRFLOW <Cooling>...
Main Functions SiUS12-928_B Automatic Operation Outline Automatic Cooling / Heating Function When the automatic operation 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. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
SiUS12-928_B 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 51
Main Functions SiUS12-928_B CTXS/FTXS-L series Room thermistor temperature – target temperature 3.6°F (2.0°C) 2.7°F (1.5°C) 0.9°F (0.5°C) (R14451) CDXS/FDXS series Room thermistor temperature – target temperature 1.5°C (2.7°F) 1.8°F (1.0°C) 0.5°C (0.9°F) (R12402) Refer to “Temperature Control” on page 35 for detail. Function and Control...
SiUS12-928_B Main Functions 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.
Main Functions SiUS12-928_B ECONO Operation Outline CTXS/FTXS-L, CDXS/FDXS-L Series 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.
SiUS12-928_B Main Functions 1.10 HOME LEAVE Operation Outline FDXS-D Series HOME LEAVE operation is a function that allows you to record your favorite set temperature and airflow rate. You can start your favorite operation mode simply by pressing the [HOME LEAVE] button on the remote controller.
Main Functions SiUS12-928_B 1.11 INTELLIGENT EYE Operation (CTXS/FTXS Series) Outline This function detects the existence of humans in the room with a motion sensor (INTELLIGENT EYE) and reduces the capacity when there is nobody in the room in order to save electricity. Detail 1.
SiUS12-928_B Main Functions 1.12 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.
Main Functions SiUS12-928_B 1.13 Other Functions 1.13.1 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 the airflow is either stopped or made very weak thereby carrying out comfortable heating of the room.
Page 58
SiUS12-928_B Main Functions 1.13.6 Auto-restart Function If a power failure (including one for just a moment) occurs during the operation, the operation restarts automatically when the power is restored in the same condition as before the power failure. Note: It takes 3 minutes to restart the operation because the 3-minute standby function is activated. 1.13.7 WEEKLY TIMER Operation CTXS/FTXS-L Series Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total).
Function of Thermistor SiUS12-928_B 2. Function of Thermistor <2MXS18GVJU> Outdoor electronic expansion valve Receiver Defrost solenoid valve Four way valve Compressor (R17358) <3MXS24JVJU> Outdoor electronic expansion valve Four way valve Compressor (R17359) <4MXS32GVJU> Outdoor electronic expansion valve Four way valve Compressor (R17360) Function and Control...
Page 60
SiUS12-928_B Function of Thermistor (1) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe temperature. The system sets the target discharge pipe temperature according to the outdoor Exchanger and indoor heat exchanger temperature, and controls the outdoor electronic expansion valve Thermistor opening so that the target discharge pipe temperature can be obtained.
Page 61
Function of Thermistor SiUS12-928_B (5) Liquid Pipe 1. When only one indoor unit is in heating, the liquid pipe thermistor is used for subcooling control. The actual subcool is calculated with the liquid pipe temperature and the maximum indoor heat Thermistor exchanger temperature.
SiUS12-928_B Control Specification 3. Control Specification Mode Hierarchy Outline Air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing. Detail Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Forced heating operation Wiring error check operation Power transistor test mode...
Control Specification SiUS12-928_B Frequency Control Outline Frequency that corresponds to each room’s capacity is determined according to the difference between the target temperature and the temperature of each room. The function is explained as follows. 1. How to determine frequency 2.
Page 64
SiUS12-928_B Control Specification Indoor Frequency Command (D signal) The difference between a room thermistor temperature and the target temperature is taken as the “D signal” and is used for frequency command. D D D D Temperature Temperature Temperature Temperature difference signal difference signal...
Control Specification SiUS12-928_B Controls at Mode Changing / Start-up 3.3.1 Preheating Operation Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the preheating command from the indoor unit. Detail ON Condition When the outdoor temperature is below 50.9°F (10.5°C), the inverter operation in open phase starts.
SiUS12-928_B Control Specification 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not used when defrosting.) (Hz) Frequency (sec.) Time (R13528) A (Hz) B (Hz) C (Hz) D (seconds) E (seconds)
Control Specification SiUS12-928_B Input Current Control Outline An input current is detected by the CT while the compressor is running, and the frequency upper limit is set from the input current. In case of heat pump models, this control which is the upper limit control of the frequency takes priority over the lower limit control of four way valve operation compensation.
SiUS12-928_B Control Specification Heating Peak-cut Control Outline During heating operation, the indoor heat exchanger temperature determines the frequency upper limit to prevent abnormal high pressure. The operating frequency is judged with the indoor heat exchanger temperature 2 minutes after Detail the operation starts and seconds after the number of operation room is changed.
Control Specification SiUS12-928_B Outdoor Fan Control 1. 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. 2. Fan OFF control during defrosting The outdoor fan is turned OFF while defrosting.
SiUS12-928_B 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.
Control Specification SiUS12-928_B 3.11 Low Hz High Pressure Limit Outline The system controls the upper limit of the frequency to prevent abnormal high pressure while the frequency is low. Control is carried out according to three zones. Detail Dropping zone Reset zone Keep zone...
Page 72
SiUS12-928_B Control Specification Detail The followings are the examples of outdoor electronic expansion valve control which function in each operation mode. Operation pattern : Holding Functions — : No Functions When power is turned on Fully closed when power is turned on —...
Control Specification SiUS12-928_B 3.12.1 Fully Closing with Power on The outdoor electronic expansion valve is initialized when the power is turned on. The opening position is set and the pressure equalization is developed. 3.12.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The outdoor electronic expansion valve opens, and develops the pressure equalization.
Page 74
SiUS12-928_B Control Specification 3.12.8 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 condensing temperature. If the discharge pipe thermistor is disconnected, the outdoor electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.
Page 75
Control Specification SiUS12-928_B 3.12.11Target Discharge Pipe Temperature Control The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger temperature, and the outdoor electronic expansion valve opening is adjusted so that the actual discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect SH (superheating) control using the discharge pipe temperature) The target discharge pipe temperature is set as to become the...
SiUS12-928_B Control Specification 3.13 Malfunctions 3.13.1 Sensor Malfunction Detection Sensor malfunction may occur either in the thermistor or current transformer (CT) system. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Gas pipe thermistor for each room 5.
Page 77
Control Specification SiUS12-928_B 3.13.4 Anti-icing Function If the indoor heat exchanger’s temperature drops below the specified temperature during cooling, fully-closed operation the outdoor electonic expansion valve will open and the is carried out in the room. After this, if an abnormal freezing occurs for longer than a specified time, the system will shut down.
System Configuration SiUS12-928_B 1. System Configuration After installation and trial 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.
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series 2. CTXS-J, CTXS-H, FTXS-H Series Remote Controller Name of Parts Remote Controller: ARC452A9 Signal transmitter Display (LCD) Receiver • Displays the current settings. (In this illustration, each section is shown with its displays on for the •...
Page 81
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B Open the front cover MODE selector button HOME LEAVE button • Selects the operation mode. • HOME LEAVE operation. (AUTO/DRY/COOL/HEAT/ Page 18 FAN) Page 10 SWING button • Adjusting the airflow direction. Page 12 QUIET button •...
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series 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 83
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B To change the airflow rate setting Press DRY operation AUTO or COOL or HEAT or FAN operation 5 levels of airflow rate setting from The airflow rate setting is not variable. “ ” to “ ”...
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series 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 • “ ”...
Page 85
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B 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.
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series INTELLIGENT EYE Operation INTELLIGENT EYE Operation “INTELLIGENT EYE” is the infrared sensor which detects the human movement. To start INTELLIGENT EYE operation Press • “ ” is displayed on the LCD. To cancel INTELLIGENT EYE operation Press again.
Page 87
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B “INTELLIGENT EYE” is useful for energy saving Energy saving operation • Change the temperature –3.6°F (–2°C) in HEAT / +3.6°F (+2°C) in COOL / +1.8°F (+1°C) in DRY operation from set temperature. • Decrease the airflow rate slightly in FAN operation only. •...
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series 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.
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the sound level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. ...
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series HOME LEAVE Operation HOME LEAVE Operation HOME LEAVE operation is a function which allows you to record your preferred temperature and airflow rate settings. To start HOME LEAVE operation Press • “ ” is displayed on the LCD. •...
Page 91
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B What ’ s the HOME LEAVE operation? Is there a set temperature and airflow rate which is most comfortable, a set temperature and airflow rate which you use the most? HOME LEAVE operation is a function that allows you to record your favorite set temperature and airflow rate. You can start your favorite operation mode simply by pressing on the remote controller.
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series 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 93
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. Press “ ” is displayed. “ ” blinks. Press until the time setting reaches the point you like.
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series Note for Multi System Note for Multi System What is a multi system? This system has one outdoor unit connected to multiple indoor units. Selecting the operation mode room Outdoor unit 1. With the priority room setting present but inactive or not present.
Page 95
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B OUTDOOR UNIT QUIET operation Page 17 1. With the priority room setting present but inactive or not present. When using the OUTDOOR UNIT QUIET operation feature with the multi system, set all indoor units to OUTDOOR UNIT QUIET operation using their remote controllers.
SiUS12-928_B CTXS-L, FTXS-L Series 3. CTXS-L, FTXS-L Series Remote Controller Names 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 97
CTXS-L, FTXS-L Series SiUS12-928_B Open the front cover MODE selector button ECONO button • Selects the operation mode. • ECONO operation. Page 19 (AUTO/DRY/COOL/HEAT/ Page 11 FAN) SWING button • Adjusting the airflow direction. Page 13 COMFORT/SENSOR QUIET button button •...
SiUS12-928_B CTXS-L, FTXS-L Series 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. ...
CTXS-L, FTXS-L Series SiUS12-928_B 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)
SiUS12-928_B CTXS-L, FTXS-L Series 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 101
CTXS-L, FTXS-L Series SiUS12-928_B CTXS07LVJU, FTXS09/12LVJU 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 102
SiUS12-928_B CTXS-L, FTXS-L Series FTXS15/18LVJU 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.
CTXS-L, FTXS-L Series SiUS12-928_B COMFORT AIRFLOW / INTELLIGENT EYE Operation COMFORT AIRFLOW / INTELLIGENT EYE 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, providing comfortable cool or warm air that does not come in direct contact with people.
Page 104
SiUS12-928_B CTXS-L, FTXS-L Series To start operation Press and select the desired mode. • Each time the is pressed a different setting option is displayed on the LCD. • The INTELLIGENT EYE lamp lights green. Display • By selecting “ ”...
CTXS-L, FTXS-L Series SiUS12-928_B 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.
SiUS12-928_B CTXS-L, FTXS-L Series 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 the night. ...
CTXS-L, FTXS-L Series SiUS12-928_B 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. ...
SiUS12-928_B CTXS-L, FTXS-L Series 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. ...
CTXS-L, FTXS-L Series SiUS12-928_B 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. “...
SiUS12-928_B CTXS-L, FTXS-L Series 3.10 WEEKLY TIMER Operation WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week. It is convenient if the WEEKLY TIMER is set according to the family’s life style. ...
Page 111
CTXS-L, FTXS-L Series SiUS12-928_B WEEKLY TIMER Operation To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. Program 1 Program 2 Program 3 Program 4 [Monday]...
Page 112
SiUS12-928_B CTXS-L, FTXS-L Series 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. Press •...
Page 113
CTXS-L, FTXS-L Series SiUS12-928_B WEEKLY TIMER Operation Copy mode • A reservation made once can be copied to 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]...
Page 114
SiUS12-928_B CTXS-L, FTXS-L Series 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 current day will be displayed. Press to select the day of the week and the reservation number to be confirmed.
Page 115
CTXS-L, FTXS-L Series SiUS12-928_B WEEKLY TIMER Operation To delete reservations The individual reservation Press • The day of the week and the reservation number will be displayed. Press to select the day of the week and the reservation number to be deleted. Press •...
SiUS12-928_B CTXS-L, FTXS-L Series 3.11 Note for Multi System Note for Multi System Multi system has one outdoor unit connected to multiple indoor units. Selecting the operation mode With the priority room setting present but A room B room inactive or not present.
Page 117
CTXS-L, FTXS-L Series SiUS12-928_B Note for Multi System COOL / HEAT mode lock The COOL / HEAT mode lock requires initial programming during installation. Please consult your authorized dealer for assistance. The COOL / HEAT mode lock sets the unit forcibly to either COOL or HEAT operation. This function is convenient when you wish to set all indoor units connected to the multi system to the same operation mode.
FDXS-D Series SiUS12-928_B 4. FDXS-D Series Remote Controller Remote Controller 〈 ARC433B63 〉 1. Signal transmitter: 7. MODE selector button: • It sends signals to the indoor unit. • It selects the operation mode. (AUTO/DRY/COOL/HEAT/FAN) (page 10.) 2. Display: 8.
SiUS12-928_B FDXS-D Series 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 121
FDXS-D Series SiUS12-928_B To change the air flow rate setting 5. Press “FAN setting button”. DRY mode AUTO or COOL or HEAT or FAN mode Five levels of air flow rate setting from “ ” to “ ” plus “...
SiUS12-928_B FDXS-D Series 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 1. Press “POWERFUL button”. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the settings which were used before POWERFUL operation.
FDXS-D Series SiUS12-928_B OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the sound level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. ...
SiUS12-928_B FDXS-D Series HOME LEAVE Operation HOME LEAVE Operation HOME LEAVE operation is a function which allows you to record your preferred temperature and air flow rate settings. To start HOME LEAVE operation 1. Press “HOME LEAVE button”. • “ ”...
Page 125
FDXS-D Series SiUS12-928_B What’s the HOME LEAVE operation? Is there a set temperature and air flow rate which is most comfortable, a set temperature and air flow rate which you use the most? HOME LEAVE operation is a function that allows you to record your favorite set temperature and air flow rate.
SiUS12-928_B FDXS-D Series 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 127
FDXS-D Series SiUS12-928_B To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press “ON TIMER button”. is displayed. blinks. 2. Press “TIMER Setting button” until the time setting reaches the point you like.
SiUS12-928_B CDXS-L, FDXS-L Series 5. CDXS-L, FDXS-L Series Remote Controller Names 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 129
CDXS-L, FDXS-L Series SiUS12-928_B Open the front cover MODE selector button • Selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 11 QUIET button ECONO button • OUTDOOR UNIT QUIET • ECONO operation. Page 16 operation. Page 15 ON TIMER button OFF TIMER button Page 18 Page 17...
SiUS12-928_B CDXS-L, FDXS-L Series 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 131
CDXS-L, FDXS-L Series SiUS12-928_B 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)
SiUS12-928_B CDXS-L, FDXS-L Series Adjusting the Airflow Rate Adjusting the Airflow Rate 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 •...
CDXS-L, FDXS-L Series SiUS12-928_B 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.
SiUS12-928_B CDXS-L, FDXS-L Series 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. ...
CDXS-L, FDXS-L Series SiUS12-928_B 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. ...
SiUS12-928_B CDXS-L, FDXS-L Series 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. ...
CDXS-L, FDXS-L Series SiUS12-928_B 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. “...
SiUS12-928_B CDXS-L, FDXS-L Series Note for Multi System Note for Multi System Multi system has one outdoor unit connected to multiple indoor units. Selecting the operation mode With the priority room setting present but A room B room inactive or not present. When more than one indoor unit is operating, priority is given to the first unit that was turned on.
Page 139
CDXS-L, FDXS-L Series SiUS12-928_B COOL/HEAT mode lock The COOL/HEAT mode lock requires initial programming during installation. Please consult your authorized dealer for assistance. The COOL/HEAT mode lock sets the unit forcibly to either COOL or HEAT operation. This function is convenient when you wish to set all indoor units connected to the multi system to the same operation mode.
SiUS12-928_B Part 6 Service Diagnosis 1. Troubleshooting with LED ...............135 1.1 Indoor Unit....................135 1.2 Outdoor Unit ..................... 136 2. Problem Symptoms and Measures ............137 3. Service Check Function ................138 3.1 ARC452 Series Remote Controller ............138 3.2 ARC433 Series Remote Controller ............141 4.
Page 142
SiUS12-928_B 7.2 Fan Motor Connector Check ..............192 7.3 Hall IC Check ................... 192 7.4 Power Supply Waveform Check............... 193 7.5 Outdoor Electronic Expansion Valve Check..........194 7.6 Four Way Valve Performance Check ............195 7.7 Inverter Unit Refrigerant System Check........... 195 7.8 “Inverter Checker”...
Troubleshooting with LED SiUS12-928_B 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.
SiUS12-928_B Troubleshooting with LED Outdoor Unit Service monitor PCB LED A 2MXS18GVJU LED 1 LED 2 LED 3 LED 4 3MXS24JVJU (R17364) 4MXS32GVJU The outdoor unit has a green LED (LED A) and red LEDs (LED 1 ~ LED 4) on the PCB. When the microcomputer works in order, the LED A blinks, and when the system is in normal condition, the red LEDs are OFF.
Problem Symptoms and Measures SiUS12-928_B 2. Problem Symptoms and Measures Problem Symptom Check Item Details of Measure Reference Page None of the units operates. Check the power supply. Check if the rated voltage is supplied. — Check the types of the indoor units. Check if the indoor unit type is compatible with —...
SiUS12-928_B Service Check Function 3. Service Check Function ARC452 Series Remote Controller 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.
Page 147
Service Check Function SiUS12-928_B , TEMP , MODE) at the same time to enter the diagnosis mode. Check Method 2 1. Press the 3 buttons (TEMP (R14550) The left-side number blinks. (R9430) or button and change the number until you hear the two consecutive 2.
Page 148
SiUS12-928_B Service Check Function or button and change the number until you hear the long beep. 5. Press the [TEMP] (R14547) 6. Diagnose by the sound. beep : The left-side number does not correspond with the error code. two consecutive beeps : The left-side number corresponds with the error code but the right-side number does not.
Service Check Function SiUS12-928_B ARC433 Series Remote Controller 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 < ARC433 Series > (R14555) 2. Press the timer cancel button repeatedly until a long beep sounds. ...
Page 150
SiUS12-928_B Service Check Function Check Method 2 1. Press the center of the [TEMP] button and the [MODE] button at the same time to enter the diagnosis mode. (R4272) The left-side number blinks. (R14967) or button and change the number until you hear the two consecutive 2.
Page 151
Service Check Function SiUS12-928_B or button and change the number until you hear the long beep. 5. Press the [TEMP] (R4277) 6. Diagnose by the sound. beep : The left-side number does not correspond with the error code. two consecutive beeps : The left-side number corresponds with the error code but the right- side number does not.
SiUS12-928_B Code Indication on Remote Controller 4. Code Indication on Remote Controller Indoor Unit Error Codes Description Reference Page Normal condition — Indoor unit PCB abnormality Freeze-up protection control or heating peak-cut control DC motor (CTXS/FTXS series) Fan motor or related abnormality AC motor (CDXS/FDXS series) Indoor heat exchanger thermistor or related abnormality Room temperature thermistor or related abnormality...
Code Indication on Remote Controller SiUS12-928_B Outdoor Unit : ON, : OFF, : Blinks Green : Blinks in normal condition Red : OFF in normal condition Outdoor Unit LED Indication Error Codes Description Reference Page Green 3 00 Normal condition —...
SiUS12-928_B Troubleshooting for Indoor Unit 5. Troubleshooting for Indoor Unit 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 ...
Troubleshooting for Indoor Unit SiUS12-928_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the combination of the indoor and outdoor unit. Match the compatible models. ∗ To secure the connection, Check the connection of once disconnect the connector connectors (See Note.).
SiUS12-928_B Troubleshooting for Indoor Unit 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 157
Troubleshooting for Indoor Unit SiUS12-928_B 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.191 Is there any short circuit? Provide sufficient air passage. Check the air filter.
SiUS12-928_B Troubleshooting for Indoor Unit Fan Motor or Related Abnormality 5.3.1 DC Motor (CTXS/FTXS Series) 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...
Page 159
Troubleshooting for Indoor Unit SiUS12-928_B 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.192 and rotate the fan by hand.
Page 160
SiUS12-928_B Troubleshooting for Indoor Unit 5.3.2 AC Motor (CDXS/FDXS Series) 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 less than 50% of the maximum fan motor rotation speed.
Troubleshooting for Indoor Unit SiUS12-928_B Thermistor or Related Abnormality (Indoor Unit) C4, C9 Remote Controller Display Method of The temperatures detected by the thermistors are used to determine thermistor errors. Malfunction Detection Malfunction The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Decision Conditions ...
SiUS12-928_B Troubleshooting for Indoor Unit 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 abnormal.
Troubleshooting for Indoor Unit SiUS12-928_B 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...
SiUS12-928_B Troubleshooting for Outdoor Unit 6. Troubleshooting for Outdoor Unit Refrigerant Shortage Remote Controller Display Outdoor Unit LED Display Method of Refrigerant shortage detection I : Malfunction Refrigerant shortage is detected by checking the input current value and the compressor output frequency.
Page 165
Troubleshooting for Outdoor Unit SiUS12-928_B Troubleshooting 18 class 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.191 Any thermistor Replace the thermistor(s) disconnected? ∗ Discharge pipe thermistor position.
Page 166
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting 24/32 class 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.191 Any thermistor Replace the thermistor(s) disconnected? ∗ Discharge pipe thermistor position.
Troubleshooting for Outdoor Unit SiUS12-928_B Low-voltage Detection or Over-voltage Detection Remote Controller Display Outdoor Unit LED Display Method of Indoor Unit Malfunction The zero-cross detection of the power supply is evaluated by the indoor unit PCB. Detection Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit.
Page 168
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Voltage as rated? Correct the power supply. Check the connection of the compressor harness.
Troubleshooting for Outdoor Unit SiUS12-928_B Signal Transmission Error (on Outdoor Unit PCB) (24/32 Class Only) Remote Controller Display Outdoor Unit LED Display Method of Communication error between microcomputer mounted on the main PCB and PM1. Malfunction Detection The abnormality is determined when the data sent from the PM1 can not be received for 9 Malfunction Decision seconds.
SiUS12-928_B Troubleshooting for Outdoor Unit Unspecified Voltage (between Indoor Unit and Outdoor Unit) / Anti-icing Function in Other Rooms UA, UH Remote Controller Display Outdoor Unit LED Display Method of A wrong connection is detected by checking the combination of indoor and outdoor units on the Malfunction microcomputer.
Troubleshooting for Outdoor Unit SiUS12-928_B Anti-icing Function Remote Controller Display Outdoor Unit LED Display Method of During cooling operation, indoor unit icing is detected by checking the temperatures sensed by the Malfunction indoor heat exchanger thermistor and room temperature thermistor that are located in a shut-down room.
Page 172
SiUS12-928_B Troubleshooting for Outdoor Unit 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 wiring and piping. Refer to P.191 Check No.12 Wrong wiring or Activate the wiring error check piping? Refer to P.194...
Troubleshooting for Outdoor Unit SiUS12-928_B Outdoor Unit PCB Abnormality (24/32 Class Only) Remote Controller Display Outdoor Unit LED Display Method of Detect within the program of the microcomputer. Malfunction Detection Malfunction The program of the microcomputer is in abnormal running order. Decision Conditions ...
SiUS12-928_B Troubleshooting for Outdoor Unit OL Activation (Compressor Overload) Remote Controller Display Outdoor Unit LED 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 ...
Troubleshooting for Outdoor Unit SiUS12-928_B Compressor Lock Remote Controller Display Outdoor Unit LED Display Method of A compressor lock is detected by checking the compressor running condition through the position Malfunction detection circuit. Detection Judging from the current waveform generated when high-frequency voltage is applied to the Malfunction Decision compressor.
SiUS12-928_B Troubleshooting for Outdoor Unit DC Fan Lock Remote Controller Display Outdoor Unit LED 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 30 seconds even when the fan motor is running. Malfunction ...
Troubleshooting for Outdoor Unit SiUS12-928_B 6.10 Input Overcurrent Detection Remote Controller Display Outdoor Unit LED Display Method of Detected by checking the input current value Malfunction Detection The input current is at a certain value (depending on the condition) for 2.5 seconds. Malfunction ...
SiUS12-928_B Troubleshooting for Outdoor Unit 6.11 Four Way Valve Abnormality (18 Class Only) Remote Controller Display Outdoor Unit LED Display Method of The liquid pipe thermistor and the outdoor heat exchanger thermistor are checked to see if they Malfunction function within their normal ranges in the operating mode. Detection Malfunction Either of the following conditions occurs 6 minutes after the compressor has started.
Page 179
Troubleshooting for Outdoor Unit SiUS12-928_B 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 Refer to P.191 coil disconnected (loose)? Correct the four-way valve coil. Check No.13 Refer to P.195 Harness out of...
SiUS12-928_B Troubleshooting for Outdoor Unit 6.12 Discharge Pipe Temperature Control Remote Controller Display Outdoor Unit LED Display Method of Detected by the discharge pipe thermistor Malfunction Detection If the temperature detected by the discharge pipe thermistor rises above Malfunction , the compressor Decision stops.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.13 High Pressure Control in Cooling Remote Controller Display Outdoor Unit LED 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 ...
SiUS12-928_B Troubleshooting for Outdoor Unit 6.14 Compressor Sensor System Abnormality (24/32 Class Only) Remote Controller Display Outdoor Unit LED Display Fault condition is identified by the supply voltage and the DC voltage which is detected before Method of Malfunction the compressor startup.
Page 183
Troubleshooting for Outdoor Unit SiUS12-928_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Reactor connection check Connection OK? Connect the reactor properly. Compressor connection check Connect the compressor Connection OK? properly.
SiUS12-928_B Troubleshooting for Outdoor Unit 6.15 Position Sensor Abnormality Remote Controller Display Outdoor Unit LED Display Method of A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Detection If the error repeats, the system is shut down. Malfunction ...
Page 185
Troubleshooting for Outdoor Unit SiUS12-928_B Troubleshooting 18 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Refer to P.196 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.198 Voltage as rated? Correct the power supply.
Page 186
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting 24/32 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Refer to P.196 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.198 Voltage as rated? Correct the power supply.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.16 CT or Related Abnormality Remote Controller Display Outdoor Unit LED 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 Malfunction Hz and input current is less than Decision...
Page 188
SiUS12-928_B Troubleshooting for Outdoor Unit 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.196 again. Check No.21 Start operation.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.17 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, J8, J9, P4 Remote Controller Display Outdoor Unit LED Display Method of This type of error is detected by checking the thermistor input voltage to the microcomputer. Malfunction A thermistor error is detected by checking the temperature sensed by each thermistor.
Page 190
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Turn on the power again. Refer to P.191 Error displayed Reconnect the connectors again on remote or thermistors.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.18 Electrical Box Temperature Rise Remote Controller Display Outdoor Unit LED 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 Malfunction ...
Page 192
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting 18 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 WARNING Turn off the power and turn it on Refer to P.191 again.
Page 193
Troubleshooting for Outdoor Unit SiUS12-928_B Troubleshooting 24/32 class 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 Refer to P.198 again.
SiUS12-928_B Troubleshooting for Outdoor Unit 6.19 Radiation Fin Temperature Rise Remote Controller Display Outdoor Unit LED Display Method of A radiation fin temperature rise is detected by checking the radiation fin temperature with the Malfunction compressor on. Detection The radiation fin temperature with the compressor on is above Malfunction ...
Page 195
Troubleshooting for Outdoor Unit SiUS12-928_B Troubleshooting 18 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 (Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Refer to P.191 Turn off the power and turn it on Check No.17...
Page 196
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting 24/32 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.17 Refer to P.198 Turn off the power and turn it on again to start the system.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.20 Output Overcurrent Detection Remote Controller Display Outdoor Unit LED Display Method of An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Detection A position signal error occurs while the compressor is running. Malfunction ...
Page 198
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output Refer to P.196 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
Check SiUS12-928_B 7. 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.
SiUS12-928_B Check Fan Motor Connector Check Check No.02 CTXS/FTXS Series 1. Check the connection of connector. 2. Check motor power supply voltage output (pins 4 - 7). 3. Check motor control voltage (pins 4 - 3). 4. Check rotation command voltage output (pins 4 - 2). 5.
Check SiUS12-928_B Power Supply Waveform 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). ...
SiUS12-928_B Check Outdoor Electronic Expansion Valve Check Check No.12 Conduct the followings to check the outdoor electronic expansion valve (EV). 1. Check to see if the EV connector is correctly inserted in the PCB. Match the EV unit number and the connector number.
Check SiUS12-928_B Four Way Valve Performance Check Check No.13 Turn off the power and turn it on again. * Four-way valve coil Start heating operation. Cooling / dry : No continuity Heating : Continuity S80 voltage at 208/230 VAC with Replace the outdoor unit compressor on? (Fig.
SiUS12-928_B Check “Inverter Checker” Check Characteristics Check No.15 If abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (control PCB, power module, etc.).
Check SiUS12-928_B Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) If all the LEDs are lit uniformly, the compressor is defective. Replace the compressor. (2) If the LEDs are not lit uniformly, check the power module. ...
SiUS12-928_B Check 7.10 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 air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty? exchanger.
Check SiUS12-928_B 7.12 Outdoor Fan System Check Check No.19 Check the outdoor unit fan system. Fan motor lead wire Outdoor unit fan running? Reconnect the connector. connector disconnected? Outdoor unit fan system Go to Check No. 16. functioning. (R15128) 7.13 Main Circuit Short Check Check No.20 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
SiUS12-928_B Check 7.14 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. 18 class Multimeter (DC.
Check SiUS12-928_B 7.15 Power Module Check Check No.22 Note: Check to make sure that the voltage between (+) and (–) of the power module (PM1) 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.
Outdoor Unit: 2MXS18GVJU SiUS12-928_B 1. Outdoor Unit: 2MXS18GVJU 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 Appearance features (R2159) Remove the 4 screws of Top panel the top panel and the 6 screws of the front panel.
SiUS12-928_B Outdoor Unit: 2MXS18GVJU 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 The US model has a 1. Disconnect the connecting wires.
Page 213
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Step Procedure Points When reassembling, insert Disconnect the connector [S80] for the four-way valve coil the clamp into the hole as [S80]. below. Clamp (R17397) (R17398) Disconnect the [S40]: overload protector connectors for the [S90]: thermistors [S90] [S92] [S93] thermistors [S90] [S92] (outdoor temperature, outdoor...
Page 214
SiUS12-928_B Outdoor Unit: 2MXS18GVJU Step Procedure Points Disconnect the relay connector of the compressor. (R17065) Release the clamp with pliers. (R17066) Disconnect the reactor lead wires. Reactor (R2170) Removal Procedure...
Page 215
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Step Procedure Points 3. Remove the electrical box. Shield plate Remove the screw of the shield plate. (R17345) Unfasten the 2 hooks and remove the shield plate. (R17346) Hook Remove the screw on the right side of the electrical box.
Page 216
SiUS12-928_B Outdoor Unit: 2MXS18GVJU Step Procedure Points Remove the drip proof Drip proof cover cover. (R2174) Disconnect the connector Inverter PCB (MID2) for the fan motor [S70] from the inverter PCB (MID2). Release the fan motor lead wire from the hooks. [S70] (R2175) Remove the electrical...
Outdoor Unit: 2MXS18GVJU SiUS12-928_B 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 When reassembling, insert Remove the screw of the main PCB, and unfasten the base bar into the hole of the 2 hooks.
Page 218
SiUS12-928_B Outdoor Unit: 2MXS18GVJU Step Procedure Points Lift up the main PCB. (R2181) Disconnect the connectors [S31] [S32] [S33] [S71] [H1] [H2]. [S31] [S71] [S33] (R10362) [S32] [H1] (yellow) [H2] (blue) (R10363) Refer to page 30 for detail. The figure shows the main PCB.
Page 219
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Step Procedure Points Unfasten the 2 hooks and remove the service monitor PCB. Hook Priority room setting switch (SW4) LED A Wiring error check switch LED 1 (SW3) LED 2 Forced operation [ON/OFF] LED 3 switch (SW1) LED 4 NIGHT QUIET mode setting Operation mode switch...
SiUS12-928_B Outdoor Unit: 2MXS18GVJU 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 Remove the nut and Preparation remove the outdoor fan. Disconnect the connector for the fan motor and release the fan motor lead wire according to the...
Outdoor Unit: 2MXS18GVJU SiUS12-928_B 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 Remove the 5 screws of the right side panel. Right side panel (R10364)
Page 222
SiUS12-928_B Outdoor Unit: 2MXS18GVJU Step Procedure Points Remove the sound Carefully remove the sound blankets (top upper, top blanket, which is easily torn in inner, outer, inner). the piping section. Sound blanket (top upper) Sound blanket (top inner) Sound blanket (inner) Sound blanket (outer)
Outdoor Unit: 2MXS18GVJU SiUS12-928_B 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 Remove the screw and remove the four-way valve coil. Four way valve coil (R2194)
Page 224
SiUS12-928_B Outdoor Unit: 2MXS18GVJU Step Procedure Points Place the thermistor so that its Remove the putty, and remove each thermistor. edge comes up to the edge of the fixture. Be careful not to lose the clip and fixture for the thermistors. Liquid pipe thermistor Gas pipe thermistor...
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Removal of Four-Way Valve / Defrost Solenoid 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 valve Warning coil.
Page 226
SiUS12-928_B Outdoor Unit: 2MXS18GVJU Step Procedure Points Disconnect the 2 brazed Note: points, first (e), and then Do not use a metal saw for (f). cutting pipes or sawdust will Remove the defrost enter the circuit. solenoid valve. When withdrawing the pipes, be careful not to pinch them firmly with pliers.
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Removal of Distributor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Before working, make sure that the refrigerant gas is Warning empty in the circuit.
SiUS12-928_B Outdoor Unit: 2MXS18GVJU 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. (R2205) Disconnect the compressor lead wires. U (red) N (brown) W (blue)
Page 229
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Step Procedure Points Before working, make sure that the refrigerant gas is Warning empty in the circuit. Be careful not to get yourself Be sure to apply nitrogen burnt with pipes and other replacement when heating parts that are heated by the gas up the brazed part.
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 2. Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 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 Appearance features (R6368) ...
Page 231
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Slide the suction grille Hook downward to unfasten the 3 top hooks. (R14613) Remove the suction grille. (R6372) 2. Remove the top panel. Top panel Remove the 4 screws on the back and the screw on the left side.
Page 232
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points Remove the 2 screws on the front and the screw on the right side panel. Right side panel (R6374) Lift the top panel and remove it. (R6375) 3. Remove the right side panel. Remove the 5 screws.
Page 233
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Slide the right side panel downward to unfasten the 2 hooks on the back side. (R6377) Hook (R14614) Hook (R14615) Removal Procedure...
Page 234
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points The US model has a service lid Remove the right side panel. on the stop valve mounting plate. Remove the 2 screws to remove the service lid. Service lid Screw (R10372) ...
Page 235
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points (R6383) Remove the front panel (2). (R10375) Remove the discharge grille 5. Remove the front panel (1). and outdoor fan first to Remove the 4 screws on remove the front panel (1). the discharge grille.
Page 236
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points Slide the discharge grille downward to unfasten the 2 hooks at the top. Hook (R17173) Remove the discharge grille. (R10380) Nut size : M8 Remove the nut and remove the outdoor fan. 13 mm (0.51 inch) Outdoor fan...
Page 237
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Remove the 2 screws of the partition plate (1). Partition plate (1) (R10382) Remove the screw at the bottom left of the front Front panel (1) panel (1). (R10383) Remove the screw at the bottom of the left side.
Page 238
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points Remove the screw at the bottom of the back side. (R6394) The front panel (1) has a hook. Lift the front panel (1). Hook (R17174) Remove the front panel (1). (R10385) Be sure to detach the front panel (1) carefully so as not to deform it.
Page 239
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points 6. Remove the rear panel. Remove the 2 screw on the partition plate (2). Rear panel Partition plate (2) (R10386) When reassembling, bundle Slide the partition plate (2) to the left and remove it. the wires with clamp.
Page 240
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points Release the thermistor wire from the groove. Groove (R10389) Remove the 3 screws on the rear panel. (R10390) Remove the screw on the bottom frame. (R10391) Removal Procedure...
Page 241
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Remove the screw on the stop valve mounting plate. Stop valve mounting plate (R10392) Lift the rear panel to unfasten the 2 hooks. Hook Hook Hook (R12918) Remove the rear panel. (R10394) Removal Procedure...
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 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 2 screws to detach the ground wires. (R10396) Disconnect the connector [S70]...
Page 243
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Pull out the clamp. Disconnect the connector [S80] for the four-way valve coil [S80]. Clamp (R10398) A : [S20] (white) Disconnect the 4 connectors for the B : [S21] (red) electronic expansion C : [S22] (blue) valve coils (for room A, B,...
Page 244
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points When reassembling, insert Disconnect the connector for the gas pipe the clamp into the hole. [S92] thermistors [S92] and pull [S92] out the clamp. Clamp (R17356) (R10537) When reassembling, insert Disconnect the connector for the thermistors [S90] the clamp into the hole.
Page 245
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Disconnect the connector for the overload protector [S40] [S40]. (R10539) The wire harness for the compressor is attached to the partition plate (1) by the clamp. Clamp (R6422) Pull out the clamp with pliers.
Page 246
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points Disconnect the relay connector of the compressor. (R6469) Remove the screw on the stop valve mounting plate. Electrical box Stop valve mounting plate (R10395) Remove the screw on the partition plate (1). Partition plate (1) (R6411) Removal Procedure...
Page 247
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Slide the electrical box leftward to unfasten the hook on the right side. Hook (R10401) Remove the electrical box. (R10402) Removal Procedure...
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 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. Hook Unfasten the 4 hooks. The Open the cover of the hooks are marked with .
Page 250
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points 3. Remove the service monitor PCB. [S102] Disconnect the connectors from the service monitor PCB [S52] [S102]. [S52] Service monitor PCB (R10410) Slightly lift the top hook to unfasten it. (R6436) Unfasten the bottom hook to remove the service monitor PCB.
Page 251
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points 4. Remove the terminal board. Remove the screw. Terminal board (R10411) Unfasten the hook. (R10412) Remove the terminal board. (R10413) Removal Procedure...
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 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 (R10414) Be sure to remove the lower Remove the 2 lower screws of the fan motor.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B 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 coils.
Page 254
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points Peel the putty, and pull out the liquid pipe thermistors. Liquid pipe thermistor (R17413) Be careful not to lose the fixtures for the thermistors. Liquid pipe thermistor Fixture (R6450) Pull out the outdoor heat exchanger thermistor.
Page 255
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points Be careful not to lose the clip Remove the clip from the outdoor heat exchanger for the thermistor. thermistor. Clip (R6452) Slightly open the sound blanket (outer). Sound blanket (outer) (R10418) Remove the sound blanket (top upper).
Page 256
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Step Procedure Points Remove the discharge pipe thermistor. Discharge pipe thermistor (R10420) Be careful not to lose the Remove the fixture. fixture for the thermistor. Fixture (R10430) 3. Remove the four-way valve coil. Remove the screw. (R10431) Removal Procedure...
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 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). Sound blanket (outer) (R10433) ...
Page 259
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Step Procedure Points The sound blanket is fragile. Remove the sound blanket (outer). Carefully pass the discharge pipe through it. Sound blanket (outer) (R10436) The sound blanket is fragile. Remove the sound blanket (top inner). Carefully pass the discharge pipe through it.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B 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 (R6466) U : red, V : yellow, W : blue Disconnect the U(red) compressor lead wires.
SiUS12-928_B Part 8 Trial Operation and Field Settings 1. Pump Down Operation................255 2. Forced Operation ..................256 3. Wiring Error Check Function ..............257 4. Trial Operation ..................259 5. Field Settings ..................261 5.1 Outdoor Unit ..................... 261 5.2 Indoor Unit....................264 6. Application of Silicon Grease to a Power Transistor and a Diode Bridge ...................267 Trial Operation and Field Settings...
Pump Down Operation SiUS12-928_B 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.
SiUS12-928_B Forced Operation 2. Forced Operation Outline Forced operation mode includes forced cooling and forced heating. Operation mode can be selected by the operation mode switch (SW2) on the outdoor unit. Press the forced operation [ON/ OFF] switch (SW1) on the outdoor unit to start the operation. Detail Item Forced Cooling...
Wiring Error Check Function SiUS12-928_B 3. Wiring Error Check Function Outline The convenient wiring error check function is designed for the microcomputer to correct wiring errors itself. If local wiring is unclear in the case of buried piping, for example, just press the wiring error check switch that is behind the stop valve cover of the outdoor unit.
Page 266
SiUS12-928_B Wiring Error Check Function Refrigerant flows from Port A and on. The temperatures of the indoor heat exchanger Basic Knowledge thermistors are detected one by one to check up the matching between the piping and wiring. With this function on, freezing (crackling) noise may be heard from the indoor unit. This is not a problem.
Trial Operation SiUS12-928_B 4. Trial Operation Outline 1. Measure the power supply voltage and make sure that it falls in the specified range. 2. Trial operation should be carried out in either cooling or heating operation. 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 268
SiUS12-928_B Trial Operation ARC433 Series (1) Press the [ON/OFF] button to turn on the system. (2) Press the center of the [TEMP] button and the [MODE] button at the same time. (3) Press the [MODE] button twice. (T appears on the display to indicate that trial operation is selected.) (4) Press the [MODE] button and select the operation mode.
Field Settings SiUS12-928_B 5. Field Settings Outdoor Unit 5.1.1 Priority Room Setting Outdoor electronic expansion valves are controlled to provide more capacity to the prioritized room. Setting method Turn off the circuit breaker before changing the setting. Only one room can be set as the priority room (By turning on one of the SW4 on the service monitor PCB of the outdoor unit).
Page 270
SiUS12-928_B Field Settings 5.1.2 COOL / HEAT Mode Lock Use the [S15] connector to set the unit to cooling only or heating only. Setting to heating only (H): Short-circuit pins 1 and 3 of the connector [S15]. Setting to cooling only (C): Short-circuit pins 3 and 5 of the connector [S15]. The following specifications apply to the connector housing and pins.
Page 271
Field Settings SiUS12-928_B 5.1.3 NIGHT QUIET Mode If NIGHT QUIET mode is to be used, initial settings must be made when the unit is installed. Explain the function of NIGHT QUIET mode, as described below, to the customer, and confirm whether or not the customer wants to use NIGHT QUIET mode.
SiUS12-928_B Field Settings Indoor Unit 5.2.1 Model Type Setting ARC452A21, ARC452A23 The remote controller is common to the heat pump model and cooling only model. Use the DIP switch on the remote controller to set the model type. Set the DIP switch as shown in the illustration. (The factory set is the heat pump side.) •...
Page 273
Field Settings SiUS12-928_B 5.2.3 When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different address. Both the indoor unit PCB and the wireless remote controller need alteration.
SiUS12-928_B Field Settings Wireless Remote (1) Remove the cover and take it off. (2) Cut the address setting jumper. Controller ARC452 series ARC433 series Jumper Jumper ADDRESS EXIST ADDRESS (R6573) EXIST (R12065) 5.2.4 Jumper Settings Jumper (on indoor Function When connected When cut unit PCB) (factory set)
Application of Silicon Grease to a Power Transistor and a Diode Bridge SiUS12-928_B 6. 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.
Piping Diagrams SiUS12-928_B 1. Piping Diagrams Indoor Unit CTXS07JVJU, CTXS09/12HVJU FTXS15/18HVJU INDOOR UNIT INDOOR UNIT ( 5/16CuT ) (5/16CuT) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR THERMISTOR ON HEAT EXCH. ON HEAT EXCH. CROSS FLOW FAN FIELD PIPING CROSS FLOW FAN FIELD PIPING (1/4CuT) ( 1/4CuT ) FAN MOTOR...
Page 278
SiUS12-928_B Piping Diagrams FDXS09/12DVJU FDXS09/12LVJU INDOOR UNIT INDOOR UNIT (1/4CuT) ( 1/4CuT ) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR ON HEAT EXCH. THERMISTOR FIELD PIPING ON HEAT FIELD PIPING (1/4CuT) SIROCCO FAN ( 1/4CuT ) EXCH. SIROCCO FAN FAN MOTOR FAN MOTOR FIELD PIPING (3/8CuT) FIELD PIPING...
Wiring Diagrams SiUS12-928_B 2. Wiring Diagrams Indoor Unit CTXS07JVJU, CTXS09/12HVJU FIELD WIRING. PCB3 PCB1 RECTIFIER 3.15A OUTDOOR t° CAUTION TRANSMISSION NOTE THAT OPERATION WILL CIRCUIT RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS PCB4 TURNED OFF AND THEN BACK ON AGAIN. LED1 LED2 LED3...
Page 282
SiUS12-928_B Wiring Diagrams CTXS07LVJU, FTXS09/12LVJU PCB1 PCB2 V1TR 3.15A outdoor FIELD WIRING. TERMINAL FOR CAUTION TRANSMISSION CENTRALIZED CONTROL NOTE THAT OPERATION WILL CIRCUIT RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS SIGNAL TURNED OFF AND THEN BACK ON AGAIN. RECEIVER 2 RTH1 H1P ~ H3P : PILOT LAMP...
Page 283
Wiring Diagrams SiUS12-928_B FDXS09/12DVJU PCB1 PCB2 V1TR outdoor 3.15A FIELD WIRING. TERMINAL FOR CAUTION CENTRALIZED CONTROL TRANSMISSION NOTE THAT OPERATION WILL CIRCUIT RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS SIGNAL TURNED OFF AND THEN BACK ON AGAIN. RECEIVER 2 RTH1 H1P ~ H3P : PILOT LAMP : FAN MOTOR...