Page 1 SiUS181305E Service Manual Multi-Split 8-Zone Heat Pump Systems RMXS-L Series [Applied Models]  Inverter Multi : Heat Pump...
Page 2 SiUS181305E Multi-Split 8-Zone Heat Pump Systems RMXS-L Series Heat Pump Outdoor Unit RMXS48LVJU Branch Provider (BP) Unit BPMKS048A2U BPMKS049A3U Indoor Unit CTXS07LVJU FDXS09LVJU FFQ09LVJU CTXS07JVJU FDXS12LVJU FFQ12LVJU CTXS09HVJU CDXS15LVJU FFQ15LVJU CTXS12HVJU CDXS18LVJU FFQ18LVJU FTXS15LVJU CDXS24LVJU FTXS18LVJU FTXS24LVJU The removal procedure for each model is separately bound. Refer to page 239 for the booklet number of applicable model.
Page 3 SiUS181305E Safety Considerations ..............vii Part 1 List of Functions ..............1 1. Functions.....................2 1.1 Outdoor Unit ....................2 1.2 Indoor Unit....................3 Part 2 Specifications................ 5 1. Specifications ....................6 1.1 Outdoor Unit ....................6 1.2 Branch Provider (BP) Unit ................6 1.3 Indoor Unit....................
Page 4 SiUS181305E Part 5 Function ................39 1. Operation Mode ..................41 2. Basic Control.....................42 2.1 Normal Operation ..................42 2.2 Compressor PI Control................42 2.3 Electronic Expansion Valve PI Control............43 2.4 Cooling Operation Fan Control..............44 3. Special Control..................45 3.1 Startup Control ................... 45 3.2 Oil Return Operation ..................
Page 5 SiUS181305E 8.2 Thermostat Sensor in Remote Controller........... 84 8.3 Freeze Prevention Control ................. 86 8.4 Hot Start Control (In Heating Operation Only)..........86 Part 6 Test Operation and Field Settings ........87 1. Test Operation ..................88 1.1 Procedure and Outline ................88 1.2 Operation when Power is Turned On ............
Page 6 SiUS181305E 5.7 Signal Transmission Error between Remote Controller and Indoor Unit.. 173 5.8 Signal Transmission Error between MAIN Remote Controller and SUB Remote Controller................174 5.9 Field Setting Abnormality ................. 175 6. Troubleshooting for Branch Provider (BP) Unit........176 6.1 Electronic Expansion Valve Abnormality..........176 6.2 Branch Provider (BP) Unit PCB Abnormality..........
Page 7 SiUS181305E 7.33 Check for Outdoor Unit................220 8. Thermistor Resistance / Temperature Characteristics......224 9. Pressure Sensor ..................226 10.Method of Replacing Inverter’s Power Transistors Modules....227 Part 9 Appendix ................229 1. Piping Diagrams..................230 1.1 Outdoor Unit ..................... 230 1.2 Branch Provider (BP) Unit ................ 231 1.3 Indoor Unit....................
Page 8 Safety Considerations 1. Safety Considerations Read these SAFETY CONSIDERATIONS carefully before • Do not start or stop the air conditioner or heat pump repairing air conditioners and heat pumps. After completing operation by plugging or unplugging the power cord. repairs, check if the unit operates properly. All electrical Plugging or unplugging he power cord to operate or repairs and work must be carried out by qualified personnel disconnect the equipment could cause an electrical...
Page 9 Safety Considerations • Do not touch the refrigerant pipes during and Inspections after Repairs immediately after operation for any repair work as the refrigerant pipes may be hot or cold, depending WARNING on the condition of the refrigerant flowing through the refrigerant piping, compressor, and other •...
Page 10 Safety Considerations Safety Considerations...
Page 11 SiUS181305E Part 1 List of Functions 1. Functions.....................2 1.1 Outdoor Unit ....................2 1.2 Indoor Unit....................3 List of Functions...
Page 12 SiUS181305E Functions 1. Functions Outdoor Unit Category Functions Category Functions  Basic Inverter (with inverter power control) Health & Air-purifying filter — Function Clean –5 Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — ~ 46 Air-purifying filter with photocatalytic Operation limit for cooling (°FDB) —...
Page 13 Functions SiUS181305E Indoor Unit Category Functions       Basic Function Inverter (with inverter power control) Operation limit for cooling (°CDB) — — — — — — Operation limit for cooling (°FDB) — — — — — —...
Page 14 SiUS181305E Functions Category Functions Health & — — — — — — Air-purifying filter Clean — — — — — — Photocatalytic deodorizing filter Air-purifying filter with photocatalytic  — — — — — deodorizing function Titanium apatite photocatalytic  ...
Page 15 SiUS181305E Part 2 Specifications 1. Specifications ....................6 1.1 Outdoor Unit ....................6 1.2 Branch Provider (BP) Unit ................6 1.3 Indoor Unit....................7 Specifications...
Page 16 SiUS181305E Specifications 1. Specifications Outdoor Unit 60 Hz, 208 - 230 V Model RMXS48LVJU Cooling Capacity  Btu/h 48,000 Heating Capacity  Btu/h 54,000 Casing Color Ivory White Heat Exchanger Cross Fin Coil Type Hermetically Sealed Scroll Type Piston Displacement 791.5 Number of Revolutions r.p.m...
Page 17 Specifications SiUS181305E Indoor Unit CTXS, FTXS Series 60 Hz, 208 - 230 V CTXS07LVJU CTXS07JVJU Model Cooling Heating Cooling Heating Rated Capacity 7 kBtu/h Class 7 kBtu/h Class Front Panel Color White White 332 (9.4) 350 (9.9) 388 (11.0) 400 (11.3) 261 (7.4) 290 (8.2) 335 (9.5)
Page 18 SiUS181305E Specifications 60 Hz, 208 - 230 V FTXS15LVJU FTXS18LVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class Front Panel Color White White 568 (16.1) 593 (16.8) 583 (16.5) 625 (17.7) 477 (13.5) 505 (14.3) 484 (13.7) 526 (14.9) Airflow Rate...
Page 19 Specifications SiUS181305E CDXS, FDXS Series 60 Hz, 208 - 230 V FDXS09LVJU FDXS12LVJU 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) 280 (7.9) 280 (7.9)
Page 20 SiUS181305E Specifications 60 Hz, 208 - 230 V CDXS24LVJU Model Cooling Heating Rated Capacity 24 kBtu/h Class External Static Pressure inAq (Pa) 0.16 (40) 565 (16.0) 565 (16.0) 523 (14.8) 523 (14.8) Airflow Rate (m³/min) 477 (13.5) 477 (13.5) 395 (11.2) 395 (11.2) Type Sirocco Fan...
Page 21 Specifications SiUS181305E FFQ Series 60 Hz, 208 - 230 V FFQ09LVJU FFQ12LVJU Model Cooling Heating Cooling Heating Rated Capacity 9 kBtu/h Class 12 kBtu/h Class Wired BRC1E72 BRC1E72 Remote Controller Wireless BRC7E830 BRC7E830 Model BYFQ60B8W1U BYFQ60B8W1U Color White White Decoration Panel Dimensions (H ×...
Page 22 SiUS181305E Specifications 60 Hz, 208 - 230 V FFQ15LVJU FFQ18LVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class Wired BRC1E72 BRC1E72 Remote Controller Wireless BRC7E830 BRC7E830 Model BYFQ60B8W1U BYFQ60B8W1U Color White White Decoration Panel Dimensions (H × W × D) 2-5/32 ×...
Page 23: Table Of Contents
SiUS181305E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Outdoor Unit....................14 1.1 RMXS48LVJU .................... 14 2. Branch Provider (BP) Unit.................17 2.1 BPMKS048A2U, BPMKS049A3U .............. 17 3. Indoor Unit....................18 3.1 CTXS07LVJU ..................... 18 3.2 CTXS07JVJU, CTXS09/12HVJU ............... 20 3.3 FTXS15/18/24LVJU ................... 22 3.4 FDXS09/12LVJU, CDXS15/18/24LVJU .............
Page 24: Outdoor Unit
SiUS181305E Outdoor Unit 1. Outdoor Unit RMXS48LVJU A1P: Main PCB 1) X5A Connector to service PCB (A2P) 2) X11A Connector for outdoor temperature thermistor 3) X12A Connector for thermistors (suction pipe 1, suction pipe 2, outdoor heat exchanger, discharge pipe) 4) X13A Connector for thermistors (subcooling outlet, liquid pipe) 5) X17A...
Page 25 Outdoor Unit SiUS181305E X106A X107A X111A X66A X37A X81A X22A X21A X13A X11A X12A X18A X17A X32A X25A X26A X27A X28A 2P294944-17 Printed Circuit Board Connector Wiring Diagram...
Page 26 SiUS181305E Outdoor Unit A2P: Service PCB 1) X205A Connector for main PCB (A1P) 2) H1P - H8P LED for service monitor (orange) 3) BS1 - BS5 Push button switch (mode, set, return, test, reset) 4) DS1 DIP switch for cool / heat selector H7P H8P X205A 2P174185-1...
Page 27: Branch Provider (Bp) Unit
Branch Provider (BP) Unit SiUS181305E 2. Branch Provider (BP) Unit BPMKS048A2U, BPMKS049A3U PCB Detail 1) X20A Connector for bypass electronic expansion valve 2) X21A - X23A Connector for electronic expansion valve for room A, B, C 3) X90A Connector for thermistors 4) F2U Fuse (3.15 A / 250 V) 5) X3M...
Page 28: Indoor Unit
SiUS181305E Indoor Unit 3. Indoor Unit CTXS07LVJU Control PCB 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 Connector for display PCB 7) S47...
Page 29 Indoor Unit SiUS181305E Signal Receiver 1) S48 Connector for control PCB 3P210728-1 Display PCB 1) S49 Connector for control PCB 2) SW1 Forced operation ON/OFF button 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P) LED for INTELLIGENT EYE (green) 6) RTH1 (R1T)
Page 30: Ctxs07Jvju, Ctxs09/12Hvju
SiUS181305E Indoor Unit CTXS07JVJU, CTXS09/12HVJU Control PCB 1) S1 Connector for DC 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 6) S28 Connector for signal receiver PCB 7) S32...
Page 31 Indoor Unit SiUS181305E Signal Receiver 1) S29 Connector for control PCB 2) SW1 (S1W) Forced operation ON/OFF button 2P099167-1 Buzzer PCB 1) S27 Connector for control PCB 2) S38 Connector for display PCB 3) RTH1 (R1T) Room temperature thermistor RTH1 2P099167-1 Display PCB 1) S37...
Page 32: Ftxs15/18/24Lvju
SiUS181305E Indoor Unit FTXS15/18/24LVJU Control PCB 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 Connector for display PCB 7) S47...
Page 33 Indoor Unit SiUS181305E Signal Receiver 1) S48 Connector for control PCB 3P224121-1 Display PCB 1) S49 Connector for control PCB 2) SW1 Forced operation ON/OFF button 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P) LED for INTELLIGENT EYE (green) 6) RTH1 (R1T)
Page 34: Fdxs09/12Lvju, Cdxs15/18/24Lvju
SiUS181305E Indoor Unit FDXS09/12LVJU, CDXS15/18/24LVJU Control PCB 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 Connector for terminal board 7) FG (GND)
Page 35 Indoor Unit SiUS181305E Display PCB 1) S1 Connector for control PCB 2) SW1 (S1W) Forced operation ON/OFF button 3) LED2 (H2P) LED for timer (yellow) 4) LED3 (H3P) LED for operation (green) 5) RTH1 (R1T) Room temperature thermistor LED3 LED2 RTH1 2P084375-1 LED 1 does not function.
Page 36: Ffq09/12/15/18Lvju
SiUS181305E Indoor Unit FFQ09/12/15/18LVJU PCB ASSY 1) X5A Connector for terminal board (for wired remote controller) 2) X10A, X11A Connector for transformer 3) X15A Connector for float switch 4) X17A, X18A Connector for indoor heat exchanger thermistor 5) X19A Connector for room temperature thermistor 6) X20A Connector for fan motor 7) X24A...
Page 37: Wired Remote Controller
Wired Remote Controller SiUS181305E 4. Wired Remote Controller BRC1E72 PCB ASSY 1) P1, P2 Terminal for indoor unit 2) R1T Room temperature thermistor 2P298037-3 Printed Circuit Board Connector Wiring Diagram...
Page 38: Wireless Remote Controller
SiUS181305E Wireless Remote Controller 5. Wireless Remote Controller BRC7E830 Signal Receiver 1) X1A Connector for display PCB 2) X2A Connector for indoor unit PCB 3) SS1 MAIN / SUB setting switch Address setting switch  Refer to page 117 for detail. 3P156326-3 Display PCB 1) X1A...
Page 39 SiUS181305E Part 4 Refrigerant Circuit 1. Refrigerant Circuit ..................31 1.1 Outdoor Unit ....................31 1.2 Branch Provider (BP) Unit ................32 2. Functional Parts Layout ................33 3. Refrigerant Flow for Each Operation Mode..........35 3.1 Cooling Operation ..................35 3.2 Heating Operation ..................36 3.3 Cooling Oil Return Operation ..............
Page 40: Refrigerant Circuit Part
Refrigerant Circuit SiUS181305E 1. Refrigerant Circuit Outdoor Unit No. in Symbol Name Major Function diagram The compressor is operated on frequencies between 36 Hz and 195 Hz by using the Compressor motor inverter. (31 steps) Since the system is of air heat exchanging type, the fan is operated at 8-step rotation Fan motor speed by using the inverter.
Page 41: Branch Provider (Bp) Unit
SiUS181305E Refrigerant Circuit Branch Provider (BP) Unit No. in Symbol Name Major Function diagram Electronic expansion valve Among EVA, EVB and EVC, the electronic expansion valve of operating room is called (for operating room) EVU. Electronic expansion valve Among EVA, EVB and EVC, the electronic expansion valve of stopping room is called (for non-operating room) EVT.
Page 42: Functional Parts Layout
Functional Parts Layout SiUS181305E 2. Functional Parts Layout Front View Y2S: Solenoid valve (hot gas bypass) (Connector: black) L1R: Reactor lead wire (High voltage) Y2S: Solenoid valve (hot gas bypass) lead wire (Connector: black) S1NPH: High pressure sensor (High voltage) (Connector: red) Y1S: Four-way valve lead wire Y1S: Four-way valve...
Page 43 SiUS181305E Functional Parts Layout Back View R6T : Thermistor (subcooling heat exchanger gas pipe) (Marking : white) R3T : Thermistor (suction pipe 1) (Marking : red) R5T : Thermistor (suction pipe 2) (Marking : green) R1T : Thermistor (outdoor temperature) (Marking : yellow) R4T : Thermistor (outdoor heat exchanger)
Page 44: Refrigerant Flow For Each Operation Mode
Refrigerant Flow for Each Operation Mode SiUS181305E 3. Refrigerant Flow for Each Operation Mode Cooling Operation Refrigerant Circuit...
Page 45: Heating Operation
SiUS181305E Refrigerant Flow for Each Operation Mode Heating Operation Refrigerant Circuit...
Page 46: Cooling Oil Return Operation
Refrigerant Flow for Each Operation Mode SiUS181305E Cooling Oil Return Operation Refrigerant Circuit...
Page 47: Heating Oil Return Operation & Defrost Operation
SiUS181305E Refrigerant Flow for Each Operation Mode Heating Oil Return Operation & Defrost Operation Refrigerant Circuit...
Page 48 SiUS181305E Part 5 Function 1. Operation Mode ..................39 2. Basic Control.....................40 2.1 Normal Operation ..................40 2.2 Compressor PI Control................40 2.3 Electronic Expansion Valve PI Control............41 2.4 Cooling Operation Fan Control..............42 3. Special Control..................43 3.1 Startup Control ................... 43 3.2 Oil Return Operation ..................
Page 49 SiUS181305E 7.12 Clock Setting ....................72 7.13 WEEKLY TIMER Operation ............... 73 7.14 Other Functions..................79 8. Function of FFQ Series ................80 8.1 Drain Pump Control..................80 8.2 Thermostat Sensor in Remote Controller........... 82 8.3 Freeze Prevention Control ................. 84 8.4 Hot Start Control (In Heating Operation Only)..........
Page 50: Operation Mode
Operation Mode SiUS181305E 1. Operation Mode Operation in stop mode Indoor unit stop or Indoor unit thermostat ON thermostat OFF Malfunction/Standby Restart standby Pressure (Compressor stop) equalization prior to startup Malfunction/ Standby Indoor unit stop or thermostat OFF Startup control •...
Page 51: Basic Control
SiUS181305E Basic Control 2. Basic Control Normal Operation <Cooling Operation> Actuator Operation Remarks Used for high pressure protection control, low pressure protection control, discharge pipe Compressor Compressor PI control temperature protection control, and compressor operating frequency upper limit control with inverter protection control.
Page 52: Electronic Expansion Valve Pi Control
Basic Control SiUS181305E Step Full-load Unload Step Full-load Unload 36.0 Hz 110.0 Hz 39.0 Hz 116.0 Hz 43.0 Hz 122.0 Hz 47.0 Hz 128.0 Hz 52.0 Hz 134.0 Hz 52.0 Hz 57.0 Hz 140.0 Hz 57.0 Hz 64.0 Hz 146.0 Hz 62.0 Hz 71.0 Hz 152.0 Hz...
Page 53: Cooling Operation Fan Control
SiUS181305E Basic Control Cooling Operation Fan Control In cooling operation with low outdoor temperature, cooling operation fan control provides the adequate amount of circulating air with liquid pressure secured by high pressure control using the outdoor fan. When the outdoor temperature is  20°C (68°F), the fan operates in STEP 7 or higher. When the outdoor temperature is ...
Page 54: Special Control
Special Control SiUS181305E 3. Special Control Startup Control Startup control equalizes the pressure in the front and back of the compressor before the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.
Page 55: Oil Return Operation
SiUS181305E Special Control Oil Return Operation In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil flown out from the compressor to the system side. 3.2.1 Oil Return Operation in Cooling Operation <Conditions to start>...
Page 56 Special Control SiUS181305E 3.2.2 Oil Return Operation in Heating Operation <Conditions to start> Oil return operation in heating operation is started referring to the following conditions:  Integrated amount of displaced oil  Timer setting (Make this setting so as to start the oil return operation when the initial cumulative operating time reaches 2 hours after power supply is turned ON and then every 8 hours.) The integrated amount of displaced oil is derived from Tc, Te, and the compressor load.
Page 57: Defrosting Operation
SiUS181305E Special Control Defrosting Operation The defrosting operation is performed to solve frost on the outdoor unit heat exchanger when heating, in order to recover heating capacity. <Conditions to start> The defrosting operation is started referring to the following conditions: ...
Page 58: Restart Standby
Special Control SiUS181305E 3.4.1 Pump-down Residual Operation in Cooling Operation Pump-down residual operation Actuator Step 1 Step 2 Compressor 124 Hz Full load 52 Hz Full load Outdoor fan Fan control Fan control Four-way valve (Y1S) Main electronic expansion valve (Y1E) 480 pulse 240 pulse Subcooling electronic expansion valve (Y3E)
Page 59: Protection Control
SiUS181305E Protection Control 4. Protection Control High Pressure Protection Control Outline High pressure protection control is used to prevent the activation of protection devices due to an abnormal increase of high pressure and to protect compressors against the temporary increase of high pressure.
Page 60: Low Pressure Protection Control
Protection Control SiUS181305E Low Pressure Protection Control Outline Low pressure protection control is used to protect compressors against the temporary decrease of low pressure. <Cooling Operation> Low pressure not limited Pe: Low pressure sensor detection value < 0.25 MPa (84 ftAq) >...
Page 61: Discharge Pipe Temperature Protection Control
SiUS181305E Protection Control Discharge Pipe Temperature Protection Control Outline Discharge pipe temperature protection control protects the compressor internal temperature against a malfunction or temporary increase of discharge pipe temperature. <Compressor> Discharge pipe temperature protection control not limited HTdi > 115˚C (239˚F) Tp >...
Page 62: Inverter Protection Control
Protection Control SiUS181305E Inverter Protection Control Outline Inverter overcurrent protection control and inverter fin temperature control are performed to prevent tripping due to a malfunction, temporary inverter overcurrent, or radiation fin temperature increase. <Inverter overcurrent protection control> Not limited Inverter current ≤ 23.8 A &...
Page 63: Freeze-Up Protection Control
SiUS181305E Protection Control Freeze-up Protection Control Outline According to the freeze prevention status sent from the BP unit, the compressor output frequency is regulated to decrease compressor capacity in order to prevent the indoor heat exchanger from freezing. Detail Zones are divided based on the freeze prevention status signal sent from the BP unit (indoor unit), and the freeze prevention control prevents freezing of the indoor unit.
Page 64: Dew Condensation Prevention Control
Protection Control SiUS181305E Dew Condensation Prevention Control Outline According to the dew condensation prevention status sent from the BP unit, the compressor output frequency is regulated to decrease compressor capacity in order to prevent the indoor unit from dew condensation. Detail Zones are divided based on the dew condensation prevention status signal sent from the BP unit (indoor unit), and the dew condensation prevention control prevents dew condensation of the...
Page 65: Other Control
SiUS181305E Other Control 5. Other Control Demand Control In order to lower power consumption, the capacity of the outdoor unit is forcibly lowered using the Demand 1 Setting. To operate the unit with this mode, additional setting of Constant Demand Setting is necessary. <Demand 1 setting>...
Page 66: Branch Provider (Bp) Unit Control
Branch Provider (BP) Unit Control SiUS181305E 6. Branch Provider (BP) Unit Control Branch Provider (BP) Unit Command Conversion 1. D (room thermistor temperature  target temperature) signals from BP units are converted to a capacity up / down signal. D signals from BP units are used as the capacity up / down signal in frequency commands (excludes during POWERFUL operation).
Page 67: Branch Provider (Bp) Unit Electronic Expansion Valve Control
SiUS181305E Branch Provider (BP) Unit Control Branch Provider (BP) Unit Electronic Expansion Valve Control This function provides instructions regarding the absolute flow rate, relative flow rate and fully closing from the outdoor unit to the BP unit in order to ensure outdoor unit compressor safety and optimum refrigerating cycle of the system.
Page 68 Branch Provider (BP) Unit Control SiUS181305E 6.2.3 Full Closing of Electronic Expansion Valves Outline The electronic expansion valves are initialized when the power is turned on. Detail The following processes are conducted. 1. Conducts P1 pulses close when power is turned on, and sets current opening to 0 pulse (fully closing process).
Page 69: Sh Control In Cooling Operation
SiUS181305E Branch Provider (BP) Unit Control SH Control in Cooling Operation Outline This function ensures appropriate refrigerant distribution when many indoor units are operating in cooling operation. Detail The heat exchanger temperatures and gas pipe temperatures of operating indoor units are detected by the gas pipe thermistors, and the flow rates of the electronic expansion valve are corrected so as to adjust the difference between the heat exchanger temperature and gas pipe temperature of each indoor unit (hereafter referred to as SH) close to the target values.
Page 70: Sc Control In Heating Operation
Branch Provider (BP) Unit Control SiUS181305E Note: 1. In SkyAir models, the indoor units are equipped with distribution capillary tubes; as a result, the heat exchangers may superheat even when the condition is met. 2. In SkyAir models, the heat exchanger intermediate position is provided on the liquid connection pipe side;...
Page 71: Function Of Ctxs, Ftxs, Cdxs, Fdxs Series
SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series 7. Function of CTXS, FTXS, CDXS, FDXS Series 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 ...
Page 72: Airflow Direction Control (Ctxs/Ftxs Series Only)
Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E Airflow Direction Control (CTXS/FTXS Series Only) Power-Airflow The large louver sends a large volume of air downward to the floor and provides an optimum control in cooling, dry, and heating operation. Dual Louvers <Cooling / Dry>...
Page 73 SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series 3-D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform airconditioning of the entire room. This function is effective for starting the air conditioner. When the horizontal swing and vertical swing are both set to automatic operation, the airflow becomes 3-D airflow.
Page 74: Fan Speed Control For Indoor Unit
Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E 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 75: Program Dry Operation
SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series Note: 1. During POWERFUL operation, the fan rotates at H tap + 50 ~ 90 rpm (depending on the model). 2. The fan stops during defrost operation. COMFORT CTXS-L, FTXS-L Series  The fan speed is automatically controlled within the following steps. AIRFLOW <Cooling>...
Page 76: Automatic Operation
Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E 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.
Page 77: Thermostat Control
SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Detail Thermostat OFF Condition  The temperature difference is in the zone A. Thermostat ON Condition ...
Page 78: Night Set Mode
Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E 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 cooling, or lowers it slightly in heating.
Page 79: Home Leave Operation
SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series HOME LEAVE Operation Outline CTXS-J, CTXS-H 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.
Page 80 Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E How to Set the Temperature and Airflow Rate When using HOME LEAVE operation for the first time, set the temperature and airflow rate for HOME LEAVE operation. Record your preferred temperature and airflow rate. Initial setting Selectable range Temperature...
Page 81: Intelligent Eye Operation
SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series 7.10 INTELLIGENT EYE Operation Outline CTXS, FTXS Series 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.
Page 82: Inverter Powerful Operation
Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E 7.11 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 83: Clock Setting
SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series 7.12 Clock Setting ARC452 Series The clock can be set by taking the following steps: 1. Press the CLOCK button.  is displayed and MON and blink.  or  button to set the clock to the current day of the week. 2.
Page 84: Weekly Timer Operation
Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E 7.13 WEEKLY TIMER Operation Outline CTXS-L, FTXS-L series Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total). The 3 items: ON/OFF, temperature, and time can be set. Detail ...
Page 85 SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series  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...
Page 86 Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10 minute intervals. • To return to the ON/OFF TIMER mode setting, press • Go to STEP when setting the OFF TIMER.
Page 87 SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series 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 88 Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E  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 89 SiUS181305E Function of CTXS, FTXS, CDXS, FDXS Series  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 •...
Page 90: Other Functions
Function of CTXS, FTXS, CDXS, FDXS Series SiUS181305E 7.14 Other Functions 7.14.1 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 91: Function Of Ffq Series
SiUS181305E Function of FFQ Series 8. Function of FFQ Series Drain Pump Control 8.1.1 When the Float Switch is Tripped While the Cooling Thermostat is ON: The remote controller displays A3 and the indoor unit stops. Thermostat (running) Float switch Drain pump 5 min.
Page 92 Function of FFQ Series SiUS181305E 8.1.3 When the Float Switch is Tripped During Heating Operation: The remote controller displays A3 and the indoor unit stops. Thermostat (running) Humidifier Reset Float switch Drain pump 5 min. 5 sec. 5 min. (R16094) During heating operation, if the float switch is not reset even after the 5 minutes operation, 5 seconds stop, 5 minutes operation cycle ends, operation continues until the switch is reset.
Page 93: Thermostat Sensor In Remote Controller
SiUS181305E Function of FFQ Series Thermostat Sensor in Remote Controller Outline Temperature is controlled by both the thermostat sensor in remote controller and air suction thermostat in the indoor unit. (This is however limited to when the field setting for the thermostat sensor in remote controller is utilized.) Cooling If there is a significant difference in the set temperature and the suction temperature, fine...
Page 94 Function of FFQ Series SiUS181305E Heating When heating, the hot air rises to the top of the room, resulting in the temperature being lower near the floor where the occupants are. When controlling by body thermostat sensor only, the indoor unit may therefore be turned off by the thermostat before the lower part of the room reaches the set temperature.
Page 95: Freeze Prevention Control
SiUS181305E Function of FFQ Series Freeze Prevention Control When the temperature detected by liquid pipe thermistor (R2T) of the indoor heat exchanger drops too low, the unit enters freeze prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below. Conditions for starting: Temperature is –1°C (30.2°F) or less for total of 40 min., or temperature is –5°C (23°F) or less for total of 10 min.
Page 96 SiUS181305E Part 6 Test Operation and Field Settings 1. Test Operation ..................86 1.1 Procedure and Outline ................86 1.2 Operation when Power is Turned On ............88 1.3 Branch Provider (BP) Unit ................89 1.4 RA Indoor Unit: CTXS, FTXS, CDXS, FDXS Series ........91 1.5 SA Indoor Unit: FFQ Series................
Page 97: Test Operation
SiUS181305E Test Operation 1. Test Operation Procedure and Outline Follow the following procedure to conduct the initial test operation after installation. 1.1.1 Check Work Prior to Turn Power Supply On  Is the power supply single-phase 208 ~ 230 V, 60 Hz? Check the below items.
Page 98 Test Operation SiUS181305E 1.1.3 Check Operation * During check operation, mount front panel to avoid the misjudging. * Check operation is mandatory for normal unit operation. (When the check operation is not executed, alarm code U3 is displayed.) ⎧  The test operation is started automatically. ⎫...
Page 99: Operation When Power Is Turned On
SiUS181305E Test Operation 1.1.4 Confirmation on Normal Operation  Conduct normal unit operation after the check operation has been completed. (When outdoor air temperature is 24°CDB (75.2°FDB) or higher, the unit can not be operated with heating operation. See the installation manual attached.) ...
Page 100: Branch Provider (Bp) Unit
Test Operation SiUS181305E Branch Provider (BP) Unit 1.3.1 Judging and reprogramming in case of redundant BP addresses The BP unit of this system is provided with specific addresses in its production stage. These addresses are for various controls. If by any chance (on 3 out of 260000 units) these addresses are redundant, the system may get in trouble.
Page 101 SiUS181305E Test Operation Example of DIP switch (DS2) settings on the BP unit's PCB DS2-1 DS2-2 DS2-3 DS2-4 BP unit 1 BP unit 2 BP unit 3 DS1 ~ 4 : Factory setting is OFF. The BP unit 1 through 3 show the first through third unit, respectively. The order of these BP units is flexible.
Page 102: Ra Indoor Unit: Ctxs, Ftxs, Cdxs, Fdxs Series
Test Operation SiUS181305E RA Indoor Unit: CTXS, FTXS, CDXS, FDXS Series Outline 1. Measure the power supply voltage and make sure that it falls within the specified range. 2. Test operation should be carried out in either cooling or heating operation. In cooling operation, select the lowest programmable temperature (18°C (64°F));...
Page 103: Sa Indoor Unit: Ffq Series
SiUS181305E Test Operation SA Indoor Unit: FFQ Series 1.5.1 Checkpoints To carry out a test operation, check the following:  Check that the temperature setting of the remote controller is at the lowest level in cooling operation or use test operation mode. ...
Page 104 Test Operation SiUS181305E Step Action Remote controller How to check airflow direction Push the Menu/OK button to enter the Main Menu. Use the buttons to select Airflow Direction and push the Menu/OK button. (R18829) Check that the airflow direction is actuated according to the setting and push the Menu/OK button.
Page 105: Field Settings
SiUS181305E Field Settings 2. Field Settings Outdoor Unit 2.1.1 Setting Mode and Monitor Mode Outline The following 3 modes can be changed over with the button switches on the service PCB and you can find the present mode by the status of the H1P indicator. H1P H3P H5P H7P H2P H4P H6P (MODE)
Page 106 Field Settings SiUS181305E Setting Mode 1 This mode is used to set and check the following items. 1. Set items ············ In order to make COOL/HEAT selection in a batch of outdoor unit group, change the setting. • COOL/HEAT selection (IND) ·····················Used to select COOL or HEAT by individual outdoor unit (factory setting).
Page 107: External Low Noise
SiUS181305E Field Settings Setting Mode 2 Press the MODE (BS1) button for 5 Setting item Description seconds and enter the setting mode Cool / heat unified Sets address for cool / heat unified operation. address Low noise / demand Address for low noise / demand operation address Used to conduct test operation without making changes to Test operation...
Page 108 Field Settings SiUS181305E Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave  Factory setting k h h h h h h  Address k h h h h h k Binary number Cool / heat unified address (6 digits)
Page 109 SiUS181305E Field Settings Setting item display C/H selection Setting condition display MODE TEST Low noise Demand Setting item Master Slave  Factory setting k h h h h h k Level 1 (outdoor fan with 6 step or lower) k h h h h k h  Setting of low noise Level 2 (outdoor fan with 5 step or lower) level...
Page 110: Off
Field Settings SiUS181305E Monitor Mode LED display Press the MODE (BS1) button and Check item Data display enter the monitor mode. h h h h h h See the note Various setting below. h h h h h k Cool / heat unified address h h h h k h Low noise / demand address h h h h k k...
Page 111 SiUS181305E Field Settings Push the BS2 (SET button) and match with the LEDs No. 1 - 15, push the BS3 (RETURN button), and confirm the data for each setting.  Data such as addresses and number of units is expressed as binary numbers; the two ways of expressing are as follows: The No.
Page 112 Field Settings SiUS181305E (1) Set Cool/Heat Separately for Each Outdoor Unit System by Indoor Unit Remote Controller  It does not matter whether or not there is outdoor - outdoor unit wiring.  Set the dip switch DS1-1 of the outdoor unit PCB (A2P) to IN (factory setting). ...
Page 113 SiUS181305E Field Settings (2) Set Cool/Heat Separately for Each Outdoor Unit System by Cool/Heat Selector  Connect the cool/heat selector (option) to the terminals A, B, C on the outdoor unit PCB (A4P).  It does not matter whether or not there is outdoor - outdoor unit wiring. ...
Page 114 Field Settings SiUS181305E 2.1.3 Setting of Low Noise Operation and Demand Operation Setting of Low Noise Operation By connecting the external contact input to the low noise input of the outdoor unit external control adaptor (optional), you can lower operating noise by 2 ~ 3 dB. When the low noise operation is automatically carried out at night (The external control adaptor for outdoor unit is not required) 1.
Page 115 SiUS181305E Field Settings Setting of Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition. Set item Condition Content Demand...
Page 116 Field Settings SiUS181305E Detailed Setting Procedure of Low Noise Operation and Demand Control 1. Setting mode 1 (H1P off) In setting mode 2, push the BS1 (MODE button) one time.  The system enters setting mode 1 and the H1P goes off. In setting mode 1, the H6P (In low noise operation) and the H7P (In demand control) keep lighting.
Page 117 SiUS181305E Field Settings 2.1.4 Setting of Refrigerant Additional Charging Operation When the outdoor unit is stopped and the entire quantity of refrigerant cannot be charged from the stop valve on the liquid side, make sure to charge the remaining quantity of refrigerant using this procedure.
Page 118 Field Settings SiUS181305E 2.1.6 Setting of Vacuuming Mode In order to perform vacuuming operation at site, fully open the expansion valves of indoor and outdoor units and turn on some solenoid valves. <Operating procedure> (1) In setting mode 2 with units in stop mode, set the item No.21 (refrigerant recovery / vacuuming mode) to ON.
Page 119: Ra Indoor Unit: Ctxs, Ftxs, Cdxs, Fdxs Series
SiUS181305E Field Settings RA Indoor Unit: CTXS, FTXS, CDXS, FDXS Series 2.2.1 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. ...
Page 120 Field Settings SiUS181305E 2.2.3 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.
Page 121 SiUS181305E Field Settings  Cut the jumper JA on PCB. CDXS/FDXS Series ADDRESS : JA EXIST (R19089) Caution Replace the PCB if you accidentally cut a wrong jumper. Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them. Wireless Remote (1) Remove the cover and take it off.
Page 122: Sa Indoor Unit: Ffq Series
Field Settings SiUS181305E SA Indoor Unit: FFQ Series 2.3.1 How to Change the Field Settings Outline If optional accessories are mounted on the indoor unit, the indoor unit setting may have to be changed. Refer to the instruction manual for each optional accessory. BRC1E72 (R18831) a Unit No.
Page 123 SiUS181305E Field Settings Step Action Remote controller Push the Menu/OK button to display the confirmation screen. Use the buttons to select Yes and push the Menu/OK button. (R18834) When multiple setting changes are needed, repeat steps 3 to 7. Push the Cancel button 2 times to return to basic screen.
Page 124: No (Factory Setting)
Field Settings SiUS181305E 2.3.2 Overview of the Field Settings Mode First Second Code No. (Note 2) Code Description of setting (Note 1) Filter Approx. Approx. Longlife cleaning 2,500 1,250 — — filter sign interval hrs. hrs. The remote The return air controller thermistor is Only the...
Page 125 SiUS181305E Field Settings 2.3.3 MAIN / SUB Setting when Using 2 Wired Remote Controllers Outline The MAIN / SUB setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to MAIN and the other to SUB.
Page 126 Field Settings SiUS181305E 2.3.4 Address and MAIN / SUB Setting for Wireless Remote Controller Outline If several wireless remote controller units are used together in the same room (including the case where both group control and individual remote controller control are used together), be sure to set the addresses for the receiver and wireless remote controller.
Page 127 SiUS181305E Field Settings Wireless Remote 1. Hold down the FILTER SIGN RESET ( ) button and the INSPECTION/TEST button at the same time for at least 4 seconds to enter the field setting mode. (SETTING is indicated on the Controller display).
Page 128 Field Settings SiUS181305E After Setting Stick the unit No. label at the decoration panel air discharge outlet as well as on the back of the wireless remote controller. Wireless remote controller Unit No. label Decoration panel (R12961) Note: Set the unit No. of the receiver and the wireless remote controller to be the same. If the settings differ, the signal from the remote controller cannot be received.
Page 129 SiUS181305E Field Settings Test Operation and Field Settings...
Page 130 SiUS181305E Part 7 Remote Controller 1. CTXS07JVJU, CTXS09/12HVJU ............118 2. CTXS07LVJU, FTXS15/18/24LVJU............120 3. FDXS09/12LVJU, CDXS15/18/24LVJU ..........122 4. FFQ09/12/15/18LVJU ................124 4.1 <BRC1E72> Wired Remote Controller............. 124 4.2 <BRC7E830> Wireless Remote Controller ..........130 Remote Controller...
Page 131: Ctxs07Jvju, Ctxs09/12Hvju
Refer to the following pages for detail. 1 POWERFUL operation P.73 Note: Refer to the operation manual of applicable model for detail. You can download operation manual from DISTRIBUTOR’S PAGE: DISTRIBUTOR’S PAGE  Product Information  Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...
Page 132 3 HOME LEAVE operation 5 Clock setting P.70 P.74 Note: Refer to the operation manual of applicable model for detail. You can download operation manual from DISTRIBUTOR’S PAGE: DISTRIBUTOR’S PAGE  Product Information  Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...
Page 133: Ctxs07Lvju, Ftxs15/18/24Lvju
Refer to the following pages for detail. 1 POWERFUL operation P.73 Note: Refer to the operation manual of applicable model for detail. You can download operation manual from DISTRIBUTOR’S PAGE: DISTRIBUTOR’S PAGE  Product Information  Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...
Page 134 P.75 4 ECONO operation 7 Clock setting P.69 P.74 Note: Refer to the operation manual of applicable model for detail. You can download operation manual from DISTRIBUTOR’S PAGE: DISTRIBUTOR’S PAGE  Product Information  Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...
Page 135: Fdxs09/12Lvju, Cdxs15/18/24Lvju
Refer to the following pages for detail. 1 POWERFUL operation P.73 Note: Refer to the operation manual of applicable model for detail. You can download operation manual from DISTRIBUTOR’S PAGE: DISTRIBUTOR’S PAGE  Product Information  Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...
Page 136 Refer to the following pages for detail. 2 ECONO operation P.69 3 Clock setting P.74 Note: Refer to the operation manual of applicable model for detail. You can download operation manual from DISTRIBUTOR’S PAGE: DISTRIBUTOR’S PAGE  Product Information  Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...
Page 137: Ffq09/12/15/18Lvju
SiUS181305E FFQ09/12/15/18LVJU 4. FFQ09/12/15/18LVJU <BRC1E72> Wired Remote Controller 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button 2.
Page 138 FFQ09/12/15/18LVJU SiUS181305E 1. Operation mode selector button 7. Left button Press this button to select the operation Used to highlight the next items on the mode of your preference. left-hand side. * Available modes vary with the indoor unit Each screen is scrolled in the left-hand model.
Page 139 SiUS181305E FFQ09/12/15/18LVJU Liquid Crystal Display  Three types of liquid crystal display (LCD) are available. The standard display is set by default.  Detailed and Simple displays can be selected in the main menu.  The displayed contents of the screen vary with the operation mode of the indoor unit model. (The following display will appear when the indoor unit is in Auto mode.) Standard display 10.Changeover controlled by...
Page 140 FFQ09/12/15/18LVJU SiUS181305E Simple Display Simple Display 1.Operation mode 1.Operation mode 14.Selectable Display 14.Selectable Display item item 3.Setpoint display 3.Setpoint display 11.Setback 11.Setback 2.Fan speed 2.Fan speed 4.Stand by for Defrost/ 4.Stand by for Defrost/ <Simple display example> <Simple display example> Hot start Hot start Common precautions for all display modes...
Page 141 SiUS181305E FFQ09/12/15/18LVJU 1. Operation mode Error: Push Menu button Warning: Push Menu button Used to display the current operation   Displayed if an error or warning is detected. mode: Cool, Heat, Vent, Fan, Dry or Auto.  In Auto mode, the actual operation mode (Cool or Heat) will be also displayed.
Page 142 FFQ09/12/15/18LVJU SiUS181305E 11.Setback SETBACK  The setback icon flashes when the unit is turned on under the setback control. 12.Airflow Direction Displayed when the airflow direction and  swing are set. If the connected indoor unit model does not  include oscillating louvers this item will not be displayed.
Page 143: Brc7E830> Wireless Remote Controller
SiUS181305E FFQ09/12/15/18LVJU <BRC7E830> Wireless Remote Controller (R18863) (R17873) PROGRAMMING TIMER BUTTON DISPLAY (SIGNAL TRANSMISSION) Use this button for programming START This lights up when a signal is being and/or STOP time. (Operates with the front transmitted. over of the remote controller opened.) DISPLAY 12 TIMER MODE START/STOP BUTTON (OPERATION MODE)
Page 144 FFQ09/12/15/18LVJU SiUS181305E Remote Controller...
Page 145 SiUS181305E Part 8 Troubleshooting 1. Troubleshooting with LED ...............134 1.1 Outdoor Unit ..................... 134 1.2 Branch Provider (BP) Unit ................ 139 1.3 Indoor Unit....................140 2. Service Check Function ................141 2.1 CTXS, FTXS, CDXS, FDXS Series............141 2.2 FFQ Series ....................144 3.
Page 146 SiUS181305E 7.7 Discharge Pipe Temperature Abnormality ..........188 7.8 Refrigerant Overcharged................189 7.9 Outdoor Temperature Thermistor (R1T) Abnormality ......190 7.10 Discharge Pipe Thermistor (R2T) Abnormality......... 191 7.11 Suction Pipe Thermistor (R3T, R5T) Abnormality ........192 7.12 Outdoor Heat Exchanger Thermistor (R4T) Abnormality ......193 7.13 Outdoor Liquid Pipe Thermistor (R7T) Abnormality .........
Page 147: Troubleshooting With Led
SiUS181305E Troubleshooting with LED 1. Troubleshooting with LED Outdoor Unit 1.1.1 Main PCB (A1P) The main PCB (A1P) has a green LED (HAP). When the microcomputer works in order, the LED blinks. (R13068) 1.1.2 Service PCB (A2P) The service PCB (A2P) has orange LEDs (H1P ~ H7P). You can identify the error code with these LEDs in monitor mode.
Page 148 Troubleshooting with LED SiUS181305E Error code indication in monitor mode <Monitor mode> Error Press the MODE (BS1) button and Contents of malfunction code enter the monitor mode. Outdoor unit PCB abnormality Detection of DIII-Net Actuation of high pressure switch High pressure switch activated (S1PH) Actuation of low pressure sensor Abnormal Pe Compressor motor lock...
Page 149 SiUS181305E Troubleshooting with LED k : ON h : OFF l : Blink Confirmation of malfunction 1 Confirmation of malfunction 2 Confirmation of malfunction 3 Confirmation of malfunction 4 Error code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P 1 1 1...
Page 150 Troubleshooting with LED SiUS181305E <Monitor mode> Error Press the MODE (BS1) button and Contents of malfunction code enter the monitor mode. High voltage of capacitor in main Imbalance of inverter power supply voltage inverter circuit Radiation fin thermistor abnormality Faulty thermistor of inverter fin Low pressure drop due to refrigerant Refrigerant shortage alarm shortage or electronic expansion valve...
Page 151 SiUS181305E Troubleshooting with LED k : ON h : OFF l : Blink Confirmation of malfunction 1 Confirmation of malfunction 2 Confirmation of malfunction 3 Confirmation of malfunction 4 Error code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P 1 1 Display 1 of...
Page 152: Branch Provider (Bp) Unit
Troubleshooting with LED SiUS181305E Branch Provider (BP) Unit : ON, : OFF, : Blinks, —: No matter Green : Blinks in normal condition Red : OFF in normal condition BP Unit LED Indication Description Green Normal condition Defective electronic expansion valve or anti-icing control in non-operating indoor unit Defective thermistor Freeze-up protection control in operating indoor unit or standby indoor unit...
Page 153: Indoor Unit
SiUS181305E 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. 2. When a signal transmission error occurs between the indoor and outdoor units. In either case, conduct the diagnostic procedure described in the following pages.
Page 154 Service Check Function SiUS181305E 2. Service Check Function CTXS, FTXS, CDXS, FDXS Series 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 155: Service Check Function
SiUS181305E Service Check Function  , 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 156 Service Check Function SiUS181305E  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.
Page 157: Ffq Series
SiUS181305E Service Check Function FFQ Series 2.2.1 BRC1E72 Relations Between Modes <Main Menu> • Airflow Direction • Quick Start • Schedule • Off Timer • Celsius / Fahrenheit • Maintenance Information • Configuration • Current Settings • Clock & Calendar Main Menu screen •...
Page 158 Service Check Function SiUS181305E Service Check The following message is displayed on the screen when a error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Function Screen Operation lamp Menu/OK button (R18817) (1) Check if it is error or warning.
Page 159 SiUS181305E Service Check Function 2.2.2 BRC7E830 Relations The following modes can be selected by using the INSPECTION/TEST button on the remote Between Modes controller. Press the INSPECTION/TEST button for more than 4 seconds. Service data can be obtained. Indoor unit settings can be made. ...
Page 160 Service Check Function SiUS181305E Step Action Press the UP or DOWN button and change the UNIT No. until the receiver of the remote controller starts to beep. UP button DOWN button (R15408) If you hear... Then... 3 short beeps Follow all steps below. 1 short beep Follow steps 3 and 4.
Page 161 SiUS181305E Service Check Function Step Action Press the UP or DOWN button to change the error code upper digit until the receiver of the remote controller starts to beep. DOWN UP button DOWN button (R15411) If you hear... Then... 2 short beeps The upper digit matches.
Page 162 Service Check Function SiUS181305E Step Action Press the UP or DOWN button and change the error code lower digit until the receiver of the remote controller generates a continuous beep. DOWN UP button DOWN button (R15413) Press the MODE button to return to the normal mode. If you do not press any button for 1 minutes, the remote controller automatically returns to the normal mode.
Page 163: Error Codes And Description
SiUS181305E Error Codes and Description 3. Error Codes and Description Error code Description Reference page RA Indoor SA Indoor BP Unit Outdoor Unit Unit Unit Indoor Indoor unit PCB abnormality — — Unit Drain level control system abnormality — — —...
Page 164 Error Codes and Description SiUS181305E Error code Description Reference page RA Indoor SA Indoor BP Unit Outdoor Unit Unit Unit Outdoor Radiation fin temperature rise — — — Unit Inverter compressor abnormality — — — Inverter current abnormality — — —...
Page 165: Troubleshooting For Ctxs, Ftxs, Cdxs, Fdxs Series
SiUS181305E Troubleshooting for CTXS, FTXS, CDXS, FDXS Series 4. Troubleshooting for CTXS, FTXS, CDXS, FDXS Series Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings.
Page 166 Troubleshooting for CTXS, FTXS, CDXS, FDXS Series SiUS181305E 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.
Page 167: Freeze-Up Protection Control Or Heating Peak-Cut Control
SiUS181305E Troubleshooting for CTXS, FTXS, CDXS, FDXS Series Freeze-up Protection Control or Heating Peak-cut Control Error Code  Freeze-up protection control Method of Error Detection During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor. ...
Page 168 Troubleshooting for CTXS, FTXS, CDXS, FDXS Series SiUS181305E 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.165 Is there any short circuit? Provide sufficient air passage.
Page 169: Fan Motor Or Related Abnormality
SiUS181305E Troubleshooting for CTXS, FTXS, CDXS, FDXS Series Fan Motor or Related Abnormality 4.3.1 DC Motor (CTXS/FTXS Series) Error Code Method of Error The rotation speed detected by the Hall IC during fan motor operation is used to determine Detection abnormal fan motor operation.
Page 170 Troubleshooting for CTXS, FTXS, CDXS, FDXS Series SiUS181305E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply Check No.02 voltage. Refer to P.166 Is the voltage fluctuation Correct the power...
Page 171 SiUS181305E Troubleshooting for CTXS, FTXS, CDXS, FDXS Series 4.3.2 AC Motor (CDXS/FDXS Series) Error code Method of Error The rotation speed detected by the Hall IC during fan motor operation is used to determine Detection abnormal fan motor operation. Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap, and is Conditions less than 50% of the maximum fan motor rotation speed.
Page 172 Troubleshooting for CTXS, FTXS, CDXS, FDXS Series SiUS181305E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.04 Refer to P.166 Check the power supply voltage. Is the voltage fluctuation Correct the power supply.
Page 173: Thermistor Or Related Abnormality
SiUS181305E Troubleshooting for CTXS, FTXS, CDXS, FDXS Series Thermistor or Related Abnormality C4, C9 Error Code Method of Error The temperatures detected by the thermistors are used to determine thermistor errors. Detection Error Decision The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Conditions ...
Page 174: Check For Ctxs, Ftxs, Cdxs, Fdxs Series
Troubleshooting for CTXS, FTXS, CDXS, FDXS Series SiUS181305E Check for CTXS, FTXS, CDXS, FDXS Series 4.5.1 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 data is for reference purpose only. Temperature (°C / °F) Resistance (k) –20 / –4...
Page 175 SiUS181305E Troubleshooting for CTXS, FTXS, CDXS, FDXS Series 4.5.2 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.
Page 176: Troubleshooting For Ffq Series
Troubleshooting for FFQ Series SiUS181305E 5. Troubleshooting for FFQ Series Indoor Unit PCB Abnormality Error Code Method of Error The system checks the data from EEPROM. Detection Error Decision When data could not be correctly received from the EEPROM EEPROM : Type of nonvolatile memory. Maintains memory contents even when the power supply Conditions is turned off.
Page 177: Drain Level Control System Abnormality
SiUS181305E Troubleshooting for FFQ Series Drain Level Control System Abnormality Error Code Method of Error The float switch detects error. Detection Error Decision When the water level reaches its upper limit and when the float switch turns OFF Conditions  Defective drain pump Supposed ...
Page 178: Fan Motor Or Related Abnormality
Troubleshooting for FFQ Series SiUS181305E Fan Motor or Related Abnormality Error Code Method of Error The signal from the fan motor detects abnormal fan speed. Detection Error Decision The fan rotations are not detected while the output voltage to the fan is at its maximum. Conditions ...
Page 179: Drain System Abnormality
SiUS181305E Troubleshooting for FFQ Series Drain System Abnormality Error Code Method of Error Water leakage is detected based on the float switch ON/OFF changeover while the compressor is not operating. Detection Error Decision When the float switch changes from ON to OFF while the compressor is OFF Conditions ...
Page 180: Thermistor Or Related Abnormality
Troubleshooting for FFQ Series SiUS181305E Thermistor or Related Abnormality C4, C5, C9 Error Code Method of Error The temperatures detected by the thermistors determine thermistor errors. Detection Error Decision The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Conditions ...
Page 181: Remote Controller Thermistor Abnormality
SiUS181305E Troubleshooting for FFQ Series Remote Controller Thermistor Abnormality Error Code Method of Error Even if remote controller thermistor is malfunctioning, the system can operate with the system Detection thermistor. Malfunction detection is carried out by the temperature detected by the remote controller thermistor.
Page 182: Signal Transmission Error Between Remote Controller And Indoor Unit
Troubleshooting for FFQ Series SiUS181305E Signal Transmission Error between Remote Controller and Indoor Unit Error Code Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub) is normal. Error Decision Normal transmission does not continue for specified period.
Page 183: Signal Transmission Error Between Main Remote Controller And Sub Remote Controller
SiUS181305E Troubleshooting for FFQ Series Signal Transmission Error between MAIN Remote Controller and SUB Remote Controller Error Code Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub) is normal. Error Decision Normal transmission does not continue for specified period.
Page 184: Field Setting Abnormality
Troubleshooting for FFQ Series SiUS181305E Field Setting Abnormality Error Code Method of Error Detection Error Decision Incorrect field setting Conditions  Defective indoor unit PCB Supposed  Defective outdoor unit PCB Causes  Defective power supply PCB  Indoor-outdoor, indoor-indoor unit transmission wiring ...
Page 185: Troubleshooting For Branch Provider (Bp) Unit
SiUS181305E Troubleshooting for Branch Provider (BP) Unit 6. Troubleshooting for Branch Provider (BP) Unit Electronic Expansion Valve Abnormality Error Code Method of Error Detection by checking continuity and lack of connector Detection Error Decision No voltage applied when turning the power supply on Conditions ...
Page 186: Branch Provider (Bp) Unit Pcb Abnormality
Troubleshooting for Branch Provider (BP) Unit SiUS181305E Branch Provider (BP) Unit PCB Abnormality Error Code Method of Error Check data from EEPROM Detection Error Decision When data could not be correctly received from the EEPROM Conditions EEPROM : Type of nonvolatile memory. Maintains memory contents even when the power supply is turned off.
Page 187: Branch Provider (Bp) Liquid Or Gas Pipe Thermistor Abnormality
SiUS181305E Troubleshooting for Branch Provider (BP) Unit Branch Provider (BP) Liquid or Gas Pipe Thermistor Abnormality Error Code Method of Error Detection Error Decision When the BP liquid or gas pipe thermistor has short circuit or open circuit Conditions  Defective BP liquid or gas pipe thermistor Supposed ...
Page 188: Signal Transmission Error Between Indoor Unit And Branch Provider (Bp) Unit
Troubleshooting for Branch Provider (BP) Unit SiUS181305E Signal transmission Error between Indoor Unit and Branch Provider (BP) Unit Error Code Method of Error The data received from the BP unit in signal transmission is checked whether it is normal. Detection Error Decision When the data sent from the BP unit cannot be received normally, or when the content of the data Conditions...
Page 189 SiUS181305E Troubleshooting for Branch Provider (BP) Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Push and hold the RESET Refer to P.182 button on the outdoor unit PCB for 5 seconds Does the malfunction occur...
Page 190: Transmission Error Between Outdoor Unit And Branch Provider (Bp) Unit
Troubleshooting for Branch Provider (BP) Unit SiUS181305E Transmission Error between Outdoor Unit and Branch Provider (BP) Unit Error Code Method of Error Transmission error is detected when the outdoor unit could not received the data from BP unit Detection correctly. Error Decision When the data from BP unit could not be correctly received continuously for 10 minutes Conditions...
Page 191: Check For Branch Provider (Bp) Unit
SiUS181305E Troubleshooting for Branch Provider (BP) Unit Check for Branch Provider (BP) Unit 6.6.1 Power Supply Waveforms Check Check No.11 Measure the power supply waveform between the pins 1 and 3 on the terminal board, and check the waveform disturbance. ...
Page 192: Troubleshooting For Outdoor Unit
Troubleshooting for Outdoor Unit SiUS181305E 7. Troubleshooting for Outdoor Unit Outdoor Unit PCB Abnormality Error Code Method of Error Check data from EEPROM Detection Error Decision When data could not be correctly received from the EEPROM Conditions EEPROM: Type of nonvolatile memory. Maintains memory contents even when the power supply is turned off.
Page 193: Actuation Of High Pressure Switch
SiUS181305E Troubleshooting for Outdoor Unit Actuation of High Pressure Switch Error Code Method of Error Abnormality is detected when the contact of the high pressure switch opens. Detection Error Decision When the high pressure switch activation count reaches the number specific to the operation mode Conditions (Reference) Operating pressure: 4.0 MPa (1338 ftAq)
Page 194 Troubleshooting for Outdoor Unit SiUS181305E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.30 Check for the points shown below. (1) Is the stop valve open? Refer to P.220 (2) Is the high pressure switch connector properly connected to the main PCB (A1P)? (3) Does the high pressure switch have continuity? Are the...
Page 195: Actuation Of Low Pressure Sensor
SiUS181305E Troubleshooting for Outdoor Unit Actuation of Low Pressure Sensor Error Code Method of Error Detection by the pressure value with the low pressure sensor Detection Error Decision When the low pressure is dropped under specific pressure Conditions Operating pressure: 0.07 MPa (23 ftAq) ...
Page 196 Troubleshooting for Outdoor Unit SiUS181305E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.31 Refer to P.221 Open the stop valve. Is the stop valve open? (1) Mount a pressure gauge on the low pressure service port.
Page 197: Compressor Motor Lock
SiUS181305E Troubleshooting for Outdoor Unit Compressor Motor Lock Error Code Method of Error The position signal is taken from UVW line, and the malfunction is detected when any abnormality Detection is observed in the phase-current waveform. Error Decision When the compressor motor does not start up even in forced startup mode Conditions ...
Page 198: Outdoor Fan Motor Abnormality
Troubleshooting for Outdoor Unit SiUS181305E Outdoor Fan Motor Abnormality Error Code Method of Error The error is determined according to the fan speed detected by Hall IC when the fan motor runs. Detection  When the fan runs with speed less than a specified one for 6 seconds or more when the fan Error Decision Conditions motor running conditions are met...
Page 199: Moving Part Of Electronic Expansion Valve (Y1E, Y3E) Abnormality
SiUS181305E Troubleshooting for Outdoor Unit Moving Part of Electronic Expansion Valve (Y1E, Y3E) Abnormality Error Code Method of Error System checks if the connector is disconnected, and the detection is based on the continuity of Detection electronic expansion valve coil. Error Decision No current is detected in the common (COM +) when power supply is ON.
Page 200 Troubleshooting for Outdoor Unit SiUS181305E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn power supply off, and turn power supply on again. Could be other causes than Return to normal? malfunction (for example, noise etc.).
Page 201: Discharge Pipe Temperature Abnormality
SiUS181305E Troubleshooting for Outdoor Unit Discharge Pipe Temperature Abnormality Error Code Method of Error The temperature detected by the discharge pipe thermistor determines the error. Detection  When the discharge pipe temperature rises to an abnormally high level (135 °C (275°F) and Error Decision Conditions above)
Page 202: Refrigerant Overcharged
Troubleshooting for Outdoor Unit SiUS181305E Refrigerant Overcharged Error Code Method of Error Excessive charging of refrigerant is detected during check operation by using outdoor temperature, Detection outdoor heat exchanger temperature, and liquid pipe temperature. Error Decision When the amount of refrigerant, which is calculated during check operation by using outdoor Conditions temperature, outdoor heat exchanger temperature, and liquid pipe temperature, exceeds the standard.
Page 203: Outdoor Temperature Thermistor (R1T) Abnormality
SiUS181305E Troubleshooting for Outdoor Unit Outdoor Temperature Thermistor (R1T) Abnormality Error Code Method of Error The temperature detected by the outdoor temperature thermistor determines the error. Detection Error Decision When the outdoor temperature thermistor has short circuit or open circuit Conditions ...
Page 204: Discharge Pipe Thermistor (R2T) Abnormality
Troubleshooting for Outdoor Unit SiUS181305E 7.10 Discharge Pipe Thermistor (R2T) Abnormality Error Code Method of Error The temperature detected by discharge pipe thermistor determines the error. Detection Error Decision When a short circuit or an open circuit in the discharge pipe thermistor is detected Conditions ...
Page 205: Suction Pipe Thermistor (R3T, R5T) Abnormality
SiUS181305E Troubleshooting for Outdoor Unit 7.11 Suction Pipe Thermistor (R3T, R5T) Abnormality Error Code Method of Error The temperature detected by the suction pipe thermistor determines the error. Detection Error Decision When a short circuit or an open circuit in the suction pipe thermistor is detected Conditions ...
Page 206: Outdoor Heat Exchanger Thermistor (R4T) Abnormality
Troubleshooting for Outdoor Unit SiUS181305E 7.12 Outdoor Heat Exchanger Thermistor (R4T) Abnormality Error Code Method of Error The temperature detected by the outdoor heat exchanger thermistor determines the error. Detection Error Decision When a short circuit or an open circuit in the outdoor heat exchanger thermistor is detected Conditions ...
Page 207: Outdoor Liquid Pipe Thermistor (R7T) Abnormality
SiUS181305E Troubleshooting for Outdoor Unit 7.13 Outdoor Liquid Pipe Thermistor (R7T) Abnormality Error Code Method of Error The temperature detected by the outdoor liquid pipe thermistor determines the error. Detection Error Decision When a short circuit or an open circuit in the outdoor liquid pipe thermistor is detected Conditions ...
Page 208: Subcooling Heat Exchanger Gas Pipe Thermistor (R6T) Abnormality
Troubleshooting for Outdoor Unit SiUS181305E 7.14 Subcooling Heat Exchanger Gas Pipe Thermistor (R6T) Abnormality Error Code Method of Error The temperature detected by subcooling heat exchanger gas pipe thermistor determines the error. Detection Error Decision When the subcooling heat exchanger gas pipe thermistor is short circuited or open Conditions ...
Page 209: High Pressure Sensor Abnormality
SiUS181305E Troubleshooting for Outdoor Unit 7.15 High Pressure Sensor Abnormality Error Code Method of Error The pressure detected by high pressure sensor determines the error. Detection Error Decision When the high pressure sensor is short circuit or open circuit Conditions ...
Page 210: Low Pressure Sensor Abnormality
Troubleshooting for Outdoor Unit SiUS181305E 7.16 Low Pressure Sensor Abnormality Error Code Method of Error The pressure detected by low pressure sensor determines the error. Detection Error Decision When the low pressure sensor is short circuit or open circuit Conditions ...
Page 211: Outdoor Unit Pcb Abnormality
SiUS181305E Troubleshooting for Outdoor Unit 7.17 Outdoor Unit PCB Abnormality Error Code  The error is detected based on the current value during waveform output before starting Method of Error Detection compressor.  The error is detected based on the value from current sensor during synchronous operation when starting the unit.
Page 212: Radiation Fin Temperature Rise
Troubleshooting for Outdoor Unit SiUS181305E 7.18 Radiation Fin Temperature Rise Error Code Method of Error Fin temperature is detected by the thermistor of the radiation fin. Detection Error Decision When the radiation fin temperature increases above 83°C (181.4°F) Conditions  Defective main PCB (A1P) Supposed ...
Page 213: Inverter Compressor Abnormality
SiUS181305E Troubleshooting for Outdoor Unit 7.19 Inverter Compressor Abnormality Error Code Method of Error The error is detected from current flowing in the power transistor. Detection Error Decision When an excessive current flows in the power transistor Conditions (Instantaneous overcurrent also causes activation.) ...
Page 214: Inverter Current Abnormality
Troubleshooting for Outdoor Unit SiUS181305E 7.20 Inverter Current Abnormality Error Code Method of Error The error is detected by current flowing in the power transistor. Detection Error Decision When overload in the compressor is detected. (Inverter secondary current 16.1 A) (1) 19.0 A and over continues for 5 seconds.
Page 215: Compressor Start-Up Error
SiUS181305E Troubleshooting for Outdoor Unit 7.21 Compressor Start-up Error Error Code Method of Error The error is detected from current flowing in the power transistor. Detection Error Decision Starting control of the compressor does not complete. Conditions  Defective compressor Supposed ...
Page 216: High Voltage Of Capacitor In Main Inverter Circuit
Troubleshooting for Outdoor Unit SiUS181305E 7.22 High Voltage of Capacitor in Main Inverter Circuit Error Code Method of Error The error is detected according to the voltage waveform of main circuit capacitor built in the Detection inverter. Error Decision When the voltage waveform becomes identical with the waveform of the power supply open phase Conditions ...
Page 217: Radiation Fin Thermistor Abnormality
SiUS181305E Troubleshooting for Outdoor Unit 7.23 Radiation Fin Thermistor Abnormality Error Code Method of Error Resistance of radiation fin thermistor is detected when the compressor is not operating. Detection Error Decision When the resistance value of thermistor becomes a value equivalent to open or short circuited Conditions status ...
Page 218: Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Abnormality
Troubleshooting for Outdoor Unit SiUS181305E 7.24 Low Pressure Drop due to Refrigerant Shortage or Electronic Expansion Valve Abnormality Error Code Method of Error Refrigerant shortage is detected by discharge pipe thermistor and low pressure saturation Detection temperature. Error Decision Microcomputer judge and detect if the system is short of refrigerant. The error is not decided while the operation continues.
Page 219 SiUS181305E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Low pressure is Cooling? Refrigerant shortage, 0.25 MPa (84 ftAq) closed stop valve or or less? refrigerant system is clogged.
Page 220: Power Supply Insufficient Or Instantaneous Failure
Troubleshooting for Outdoor Unit SiUS181305E 7.25 Power Supply Insufficient or Instantaneous Failure Error Code Method of Error Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Detection Error Decision When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power supply Conditions voltage are detected ...
Page 221: Check Operation Is Not Conducted
SiUS181305E Troubleshooting for Outdoor Unit 7.26 Check Operation is not Conducted Error Code Method of Error Check operation is executed or not Detection Error Decision When the unit starts operation without check operation Conditions Supposed Check operation is not executed. Causes Troubleshooting Be sure to turn off the power switch before connecting or disconnecting...
Page 222: Signal Transmission Error Between Indoor Unit And Outdoor Unit In The Same System
Troubleshooting for Outdoor Unit SiUS181305E 7.27 Signal transmission Error between Indoor Unit and Outdoor Unit in the Same System Error Code Method of Error Detection Error Decision Conditions  Signal transmission error within system Supposed  Defective electronic expansion valve in indoor unit of other system Causes ...
Page 223: Excessive Number Of Indoor Units
SiUS181305E Troubleshooting for Outdoor Unit 7.28 Excessive Number of Indoor Units Error Code  A difference occurs in data by the type of refrigerant between indoor and outdoor units. Method of Error  The number of indoor units is out of the allowable range. Detection ...
Page 224: Address Duplication Of Central Remote Controller
Troubleshooting for Outdoor Unit SiUS181305E 7.29 Address Duplication of Central Remote Controller Error Code Method of Error The principal indoor unit detects the same address as that of its own on any other indoor unit. Detection Error Decision The malfunction decision is made as soon as the abnormality is detected. Conditions ...
Page 225: Transmission Error Between Centralized Remote Controller And Indoor Unit
SiUS181305E Troubleshooting for Outdoor Unit 7.30 Transmission Error between Centralized Remote Controller and Indoor Unit Error Code Method of Error Microcomputer checks if transmission between indoor unit and centralized remote controller is Detection normal. Error Decision When transmission is not carried out normally for a certain amount of time Conditions ...
Page 226 Troubleshooting for Outdoor Unit SiUS181305E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. an indoor unit once connected Reset power supply been remove or its simultaneously for all address changed? optional controllers for...
Page 227: System Is Not Set Yet
SiUS181305E Troubleshooting for Outdoor Unit 7.31 System is not Set yet Error Code Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that Detection of indoor units that have made changes in temperature. Error Decision The malfunction is determined as soon as the abnormality aforementioned is detected through Conditions...
Page 228: System Abnormality, Refrigerant System Address Undefined
Troubleshooting for Outdoor Unit SiUS181305E 7.32 System Abnormality, Refrigerant System Address Undefined Error Code Method of Error The system detects an indoor unit to which auto address has not been assigned. Detection Error Decision The malfunction decision is made as soon as the abnormality is detected. Conditions ...
Page 229: Check For Outdoor Unit
SiUS181305E Troubleshooting for Outdoor Unit 7.33 Check for Outdoor Unit 7.33.1 Check for Causes of Rise in High Pressure Check No.30 Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points. ←Check to be sure the stop valve is open. Stop valve closed Local High pipe...
Page 230 Troubleshooting for Outdoor Unit SiUS181305E 7.33.2 Check for Causes of Drop in Low Pressure Check No.31 Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points. In cooling ←Are the electrical characteristics normal? Faulty low pressure sensor (See ∗1.) Faulty compressor...
Page 231 SiUS181305E Troubleshooting for Outdoor Unit 7.33.3 Fan Motor Connector Check Check No. 32 (1) Turn the power supply off. (2) With the fan motor connector disconnected, measure the resistance between each pin, then make sure that the resistance is more than the value mentioned in the following table. X106A, X107A (M1F, M2F) Measurement point...
Page 232 Troubleshooting for Outdoor Unit SiUS181305E 7.33.4 Check for the Factors of Overheat Operation Check No. 33 Identify the defective points referring to the failure factor analysis (FTA) as follows. Hot gas circuit clogging Faulty hot Defective solenoid ← Check if coil resistance and insulation gas bypass valve coil control...
Page 233: Thermistor Resistance / Temperature Characteristics
SiUS181305E Thermistor Resistance / Temperature Characteristics 8. Thermistor Resistance / Temperature Characteristics Table 1 Applicable Indoor unit Indoor unit Outdoor unit BP unit thermistor R2T: Indoor heat exchanger R1T: Room temperature R1T: Outdoor temperature DGA - DGC: Gas pipe 1 (liquid pipe) DLA - DLC: Liquid pipe R3T: Indoor heat exchanger Outdoor unit...
Page 234 Thermistor Resistance / Temperature Characteristics SiUS181305E Table 2 Applicable Outdoor unit Outdoor unit thermistor FINTH: Radiation fin R2T: Discharge pipe Thermistor temperature Resistance (k) Resistance (k) °C (°F) –30 (–22) 354.1 4759 –25 (–13) 259.7 3454 –20 (–4) 192.6 2534 –15 (5) 144.2 1877...
Page 235: Pressure Sensor
SiUS181305E Pressure Sensor 9. Pressure Sensor (MPa) = 1.38V – 0.69 (MPa) : High pressure (ftAq) = 462V – 231 (ftAq) : Low pressure (MPa) = 0.57V – 0.28 (MPa) : Output Voltage (High Side) (VDC) Detected Pressure (ftAq) = 191V –...
Page 236: Method Of Replacing Inverter's Power Transistors Modules
Method of Replacing Inverter’s Power Transistors Modules SiUS181305E 10.Method of Replacing Inverter’s Power Transistors Modules Check the power semiconductors mounted on the main PCB (A1P) with a multiple tester. <Items to be prepared>  Multiple tester : Prepare the digital type of multiple tester with diode check function. <Preparation>...
Page 237 SiUS181305E Method of Replacing Inverter’s Power Transistors Modules Power module checking When using the digital type of multiple tester, make measurement in diode check mode. Tester terminal Criterion Remark – Not less than 0.3 V It may take time to (including )...
Page 238 SiUS181305E Part 9 Appendix 1. Piping Diagrams..................226 1.1 Outdoor Unit ..................... 226 1.2 Branch Provider (BP) Unit ................ 227 1.3 Indoor Unit....................228 2. Wiring Diagrams..................230 2.1 Outdoor Unit ..................... 230 2.2 Branch Provider (BP) Unit ................ 231 2.3 Indoor Unit....................232 3.
Page 239: Piping Diagrams
SiUS181305E Piping Diagrams 1. Piping Diagrams Outdoor Unit RMXS48LVJU Electronic expansion valve Double pipe Fusible Electronic heat exchanger plug expansion valve Filter Heat exchanger Pressure regulating valve Filter Service port Four way valve High pressure Service port sensor Low pressure sensor Filter Capillary...
Page 240: Branch Provider (Bp) Unit
Piping Diagrams SiUS181305E Branch Provider (BP) Unit BPMKS048A2U INDOOR UNIT GAS SIDE ROOM A THERMISTOR ( DGA ) ( 5/8 CuT ) LOCAL PIPING SINGLE UNION JOINT GAS SIDE ROOM B REFRIGERANT FLOW THERMISTOR ( DGB ) ( 5/8 CuT ) HEATING LOCAL PIPING SINGLE UNION JOINT...
Page 241: Indoor Unit
SiUS181305E Piping Diagrams Indoor Unit CTXS07LVJU CTXS07JVJU, CTXS09/12HVJU INDOOR UNIT INDOOR UNIT 1/4 CuT (5/16CuT) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR ON HEAT EXCH. THERMISTOR CROSS FLOW FAN CROSS FLOW FAN FIELD PIPING ON HEAT EXCH. FIELD PIPING (1/4CuT) 1/4 CuT FAN MOTOR FIELD PIPING FAN MOTOR...
Page 242 Piping Diagrams SiUS181305E FDXS09/12LVJU CDXS15/18LVJU INDOOR UNIT INDOOR UNIT (1/4CuT) (1/4 (6.4mm) CuT) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR FIELD PIPING THERMISTOR ON HEAT FIELD PIPING ON HEAT (1/4CuT) EXCH. SIROCCO FAN (1/4 (6.4mm) CuT) SIROCCO FAN EXCH. FAN MOTOR FAN MOTOR FIELD PIPING (3/8CuT) FIELD PIPING...
Page 243: Wiring Diagrams
SiUS181305E Wiring Diagrams 2. Wiring Diagrams Outdoor Unit RMXS48LVJU POWER SUPPLY ~208/230V 60Hz GRN/YLW X37A H2P H4P H1P H3P ( BACK ) BS2 BS3 BS4 BS5 ( FRONT ) X205A EL , COMPO , BOX X37A NOTE ) 4 S1NPH X17A WHT LD X25A...
Page 244: Branch Provider (Bp) Unit
Wiring Diagrams SiUS181305E Branch Provider (BP) Unit BPMKS048A2U ( DLA ) ( DGA ) ( DLB ) ( DGB ) t˚ t˚ t˚ t˚ FIELD WIRING 2 DS2 X22A ROOM B ( BLU ) X21A LEDA ROOM A INDOOR ( RED ) LED1 ROOM A LED2...
Page 245: Indoor Unit
SiUS181305E Wiring Diagrams Indoor Unit CTXS07LVJU PCB1 PCB3 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 C101 TRANSMISSION CAUTION CIRCUIT NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN. t˚...
Page 246 Wiring Diagrams SiUS181305E FTXS15/18/24LVJU PCB3 PCB1 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 C101 GRN/YLW TRANSMISSION CIRCUIT CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY t˚ IS TURNED OFF AND THEN BACK ON AGAIN. RTH1 : BUZZER C101 , C102...
Page 247 SiUS181305E Wiring Diagrams FFQ09/12/15/18LVJU PRINTED CIRCUIT BOARD PILOT LAMP : CONNECTER DISCRIMINATION COLOR FOR COMPONENTS. CAPACITOR ( M1F ) ( ON-RED ) : CONNECTER COLOR FOR COMPONENTS. FUSE ( F , 5A , 250V ) PILOT LAMP : CONNECTER COLOR FOR PRINTED CIRCUIT BOARD. PILOT LAMP ( TIMER-GREEN ) ( SERVICE MONITOR GREEN )
Page 248: Removal Procedure (Booklet No.)
Removal Procedure (Booklet No.) SiUS181305E 3. Removal Procedure (Booklet No.) Refer to the following booklets for removal procedure. RMXS48LVJU, BPMKS048A2U, BPMKS049A3U Refer to Si181296_A. CTXS07LVJU Refer to Si041252_B. CTXS07JVJU, CTXS09/12HVJU Refer to Si041253_A. FTXS15/18/24LVJU Refer to Si041351. FDXS09/12LVJU, CDXS15/18/24LVJU, FFQ09/12/15/18LVJU Appendix...
Page 249 SiUS181305E Removal Procedure (Booklet No.) Appendix...
Page 250 Daikin Industries, Ltd.’s products are manufactured for export to numerous countries throughout the world. Daikin Industries, Ltd. does not have control over which products are exported to and used in a particular country. Prior to purchase, please therefore confirm with your local authorized importer, distributor and/or retailer whether this product conforms tot he applicable standards, and is suitable for use, in the region where the product will be used.

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Daikin RMXS-L Series Service Manual

Part 3 Printed Circuit Board Connector Wiring Diagram

1 Outdoor Unit

2 Branch Provider (BP) Unit

3 Indoor Unit

4 Wired Remote Controller

5 Wireless Remote Controller

Refrigerant Circuit Part 4

Refrigerant Circuit Part

1 Refrigerant Circuit

2 Functional Parts Layout

3 Refrigerant Flow for each Operation Mode

Part 5 Function

1 Operation Mode

2 Basic Control

3 Special Control

4 Protection Control

5 Other Control

6 Branch Provider (BP) Unit Control

7 Function of CTXS, FTXS, CDXS, FDXS Series

8 Function of FFQ Series

Part 6 Test Operation and Field Settings

1 Test Operation

2 Field Settings

Table of Contents

Part 7 Remote Controller

Part 8 Troubleshooting

1 Troubleshooting with LED

2 Service Check Function

3 Error Codes and Description

4 Troubleshooting for CTXS, FTXS, CDXS, FDXS Series

5 Troubleshooting for FFQ Series

6 Troubleshooting for Branch Provider (BP) Unit

7 Troubleshooting for Outdoor Unit

8 Thermistor Resistance / Temperature Characteristics

9 Pressure Sensor

10 Method of Replacing Inverter's Power Transistors Modules

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Chapters

Troubleshooting

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Summary of Contents for Daikin RMXS-L Series