Page 1 SiUS122226E Service Manual Multi-Split Type Air Conditioners 2/3/4/5MXS-W, 2/3/4MXL-W, 2/3/4MXLH-W Series [Applied Models] Inverter Pair : Heat Pump...
Page 2: Table Of Contents
SiUS122226E Introduction ..................1 1. Safety Cautions................... 2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Part 1 General Information ............... 9 1.
Page 3 SiUS122226E 2.3 Program Dry Operation ................58 2.4 Automatic Cooling/Heating Changeover ............ 59 2.5 Thermostat Control..................60 2.6 NIGHT SET Mode ..................61 2.7 ECONO Operation ..................62 2.8 2-Area INTELLIGENT EYE Operation ............63 2.9 INTELLIGENT EYE Operation ..............65 2.10 POWERFUL Operation ................
Page 4 SiUS122226E 7. BRC082A43 ....................132 8. BRC082A41W, BRC082A42W(S)............134 Part 6 Service Diagnosis ............... 136 1. General Problem Symptoms and Check Items ........138 2. Troubleshooting with LED ...............139 2.1 Indoor Unit....................139 2.2 Outdoor Unit ..................... 141 3. Service Diagnosis ...................142 3.1 ARC452 Series..................
Page 5 SiUS122226E 7.7 Actuation of High Pressure Switch ............195 7.8 OL Activation (Compressor Overload) ............. 197 7.9 Compressor Lock ..................200 7.10 DC Fan Lock .................... 202 7.11 Input Overcurrent Detection ..............203 7.12 Four Way Valve Abnormality..............205 7.13 Discharge Pipe Temperature Control............207 7.14 High Pressure Control in Cooling .............
Page 6 SiUS122226E 2. Wiring Diagrams..................282 2.1 Indoor Unit....................282 2.2 Outdoor Unit ..................... 288 3. Operation Limit..................296 Table of Contents...
Page 7: Introduction
SiUS122226E Introduction 1. Safety Cautions................... 2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Introduction...
Page 8: Safety Cautions
Safety Cautions SiUS122226E 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. This manual is for the person in charge of maintenance and...
Page 9 SiUS122226E Safety Cautions Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.
Page 10: Warnings And Cautions Regarding Safety Of Users
Safety Cautions SiUS122226E Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns. Conduct welding work in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency.
Page 11 SiUS122226E Safety Cautions Warning Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R-22) in the refrigerant system. If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
Page 12 Safety Cautions SiUS122226E Caution Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 M or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause water to enter the room and wet the furniture and floor.
Page 13: Icons Used
SiUS122226E Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part...
Page 14: Revision History
Revision History SiUS122226E 3. Revision History Month/Year Version Revised contents 08 / 2022 SiUS122226E First edition Introduction...
Page 15: Part 1 General Information
SiUS122226E Part 1 General Information 1. Applicable Models ..................10 2. Functions....................11 2.1 Indoor Unit....................11 2.2 Outdoor Unit ....................13 Part 1 General Information...
Page 16: Applicable Models
Applicable Models SiUS122226E 1. Applicable Models Indoor Unit Wall mounted type Floor standing type Duct concealed type Ceiling cassette type CTXS07WVJU9 FVXS09WVJU9 CDMQ07WVJU9 FFQ09W2VJU9 FTXS09WVJU9 FVXS12WVJU9 FDMQ09WVJU9 FFQ12W2VJU9 FVXS15WVJU9 FDMQ12WVJU9 FFQ15W2VJU9 FTXS12WVJU9 FTXS15WVJU9 FVXS18WVJU9 FDMQ15WVJU9 FFQ18W2VJU9 FTXS18WVJU9 FDMQ18WVJU9 FTXS24WVJU9 FDMQ24WVJU9 FTXR09WVJUW9 FTXR09WVJUS9 FTXR12WVJUW9...
Page 17: Functions
SiUS122226E Functions 2. Functions Indoor Unit Wall Mounted Floor Standing Category Functions CTXS FTXS FTXR FVXS Basic Function Inverter (with inverter power control)     Comfortable Power-airflow dual flaps (horizontal blade)    — Airflow Wide-angle louvers (vertical blades) ...
Page 18 Functions SiUS122226E Ceiling Cassette Ceiling Cassette Duct FFQ with FFQ with CDMQ/FDMQ BYFQ60B3W1 BYFQ60C2W1W(S) Category Functions Wired Wireless Wired Wireless Wired Wireless Basic Function Inverter (with inverter power control)       Comfortable Auto-swing — —  ...
Page 19: Outdoor Unit
SiUS122226E Functions Outdoor Unit Standard Cold Climate Function 2MXS 3/4MXS 5MXS 2MXL 3MXL 4MXL 2MXLH 3MXLH 4MXLH Inverter          (with inverter power control) Operation limit Refer to P. 296 PAM control  ...
Page 20: Part 2 Specifications
SiUS122226E Part 2 Specifications 1. Specifications ....................15 1.1 Indoor Unit....................15 1.2 Outdoor Unit ....................23 Part 2 Specifications...
Page 21: Specifications
SiUS122226E Specifications 1. Specifications Indoor Unit 1.1.1 Wall Mounted Type Model CTXS07WVJU9 FTXS09WVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 7 kBtu/h Class 9 kBtu/h Class Front Panel Color...
Page 22 Specifications SiUS122226E Model FTXS18WVJU9 FTXS24WVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 18 kBtu/h Class 24 kBtu/h Class Front Panel Color White White Airflow Rates...
Page 23 SiUS122226E Specifications Model FTXR12WVJUW9 FTXR12WVJUS9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 12 kBtu/h Class 12 kBtu/h Class Front Panel Color White Silver Airflow Rates...
Page 24 Specifications SiUS122226E 1.1.2 Floor Standing Type Model FVXS09WVJU9 FVXS12WVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 9 kBtu/h Class 12 kBtu/h Class Front Panel Color White White...
Page 25 SiUS122226E Specifications 1.1.3 Duct Concealed Type Model CDMQ07WVJU9 FDMQ09WVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 7 kBtu/h Class 9 kBtu/h Class Casing Color —...
Page 26 Specifications SiUS122226E Model FDMQ18WVJU9 FDMQ24WVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 18 kBtu/h Class 24 kBtu/h Class Casing Color —...
Page 27 SiUS122226E Specifications 1.1.4 Ceiling Cassette Type Model FFQ09W2VJU9 FFQ12W2VJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 9 kBtu/h Class 12 kBtu/h Class Decoration Panel Model BYFQ60B3W1...
Page 28 Specifications SiUS122226E Model FFQ15W2VJU9 FFQ18W2VJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Rated Capacity 15 kBtu/h Class 18 kBtu/h Class Decoration Panel Model BYFQ60B3W1 BYFQ60B3W1...
Page 29: Outdoor Unit
SiUS122226E Specifications Outdoor Unit 1.2.1 Standard Type Model 2MXS18WMVJU9 3MXS24WMVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V 4.00 (Non-Ducted) 4.40 (Non-Ducted) — —...
Page 30 Specifications SiUS122226E Model 4MXS36WMVJU9 5MXS48WVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V 4.50 (Non-Ducted) 3.90 (Non-Ducted) — — 3.10 (Ducted) 3.00 (Ducted) EER2 9.2 (Non-Ducted) 10.5 (Non-Ducted)
Page 31 SiUS122226E Specifications 1.2.2 Cold Climate Type Model 2MXL18WMVJU9 3MXL24WMVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V 4.20 (Non-Ducted) 4.40 (Non-Ducted) — — 3.12 (Ducted) 3.00 (Ducted) COP@5°F (-15°C)
Page 32 Specifications SiUS122226E Model 4MXL36WVJU9 Cooling Heating 1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 4.26 (Non-Ducted) — 3.30 (Ducted) COP@5°F (-15°C) 2.00 (Non-Ducted) — 1.75 (Ducted) EER2 11.7 (Non-Ducted) Btu/W·h — 9.3 (Ducted) SEER2 / HSPF2 20.0 (Non-Ducted) 9.0 (Non-Ducted) 15.9 (Ducted)
Page 33 SiUS122226E Specifications Model 2MXLH18WVJU9 3MXLH24WVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V 4.20 (Non-Ducted) 4.40 (Non-Ducted) — — 3.12 (Ducted) 3.00 (Ducted) COP@5°F (-15°C) 2.00 (Non-Ducted) 2.03 (Non-Ducted)
Page 34 Specifications SiUS122226E Model 4MXLH36WVJU9 Cooling Heating 1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 4.26 (Non-Ducted) — 3.30 (Ducted) COP@5°F (-15°C) 2.00 (Non-Ducted) — 1.7 (Ducted) EER2 11.7 (Non-Ducted) Btu/W·h — 9.3 (Ducted) SEER2 / HSPF2 20.0 (Non-Ducted) 8.8 (Non-Ducted) 15.9 (Ducted)
Page 35: Part 3 Printed Circuit Board Connector Wiring Diagram
SiUS122226E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................30 1.1 CTXS07WVJU9, FTXS09/12/15/18/24WVJU9 .......... 30 1.2 FTXR09/12/18WVJUW(S)9................ 33 1.3 FVXS09/12/15/18WVJU9................35 1.4 CDMQ07WVJU9, FDMQ09/12/15/18/24WVJU9 ........37 1.5 FFQ09/12/15/18W2VJU9 ................39 2. Sensor Kit for FFQ Series .................40 2.1 BRYQ60A2W(S)..................40 3.
Page 36: Indoor Unit
Indoor Unit SiUS122226E 1. Indoor Unit CTXS07WVJU9, FTXS09/12/15/18/24WVJU9 Control PCB Connector for DC fan motor (PCB1) Connector for centralized control (HA) Connector for INTELLIGENT EYE sensor PCB (PCB4) Connector for indoor heat exchanger thermistor (R2T) Connector for swing motors Connector for display PCB (PCB3) Connector for signal receiver PCB (PCB2) H1, H2, H3, Connector for terminal strip...
Page 37 SiUS122226E Indoor Unit Signal Receiver Connector for control PCB (PCB1) PCB (PCB2) CTXS07WVJU9, FTXS09/12WVJU9 FTXS15/18/24WVJU9 3P210728-1 3P224121-1 Display PCB Connector for control PCB (PCB1) (PCB3) Indoor unit ON/OFF switch LED1 (H1P) LED for operation (green) LED2 (H2P) LED for timer (yellow) LED3 (H3P) LED for INTELLIGENT EYE (green) RTH1 (R1T)
Page 38 Indoor Unit SiUS122226E INTELLIGENT CTXS07WVJU9, FTXS09/12WVJU9 EYE Sensor PCB Connector for control PCB (PCB1) (PCB4) 3EB86013-1 FTXS15/18/24WVJU9 Connector for control PCB (PCB1) 3P227885-1 Part 3 Printed Circuit Board Connector Wiring Diagram...
Page 39: Ftxr09/12/18Wvjuw(S)9
SiUS122226E Indoor Unit FTXR09/12/18WVJUW(S)9 Control PCB Connector for centralized control (HA) (A1P) Connector for INTELLIGENT EYE sensor PCB (A3P) Connector for indoor heat exchanger thermistor (R2T) Connector for swing motors Connector for reduction motor (front panel mechanism) and limit switch Connector for display/signal receiver PCB (A2P) S200 Connector for DC fan motor...
Page 40 Indoor Unit SiUS122226E Display/Signal Connector for control PCB (A1P) Receiver PCB Connector for room temperature thermistor (R1T) (A2P) Indoor unit ON/OFF switch LED for operation (multi-color) LED for INTELLIGENT EYE (green) Address setting jumper Refer to page 252 for details. 3P357402-2 Caution Replace the PCB if you cut a jumper unintentionally.
Page 41: Fvxs09/12/15/18Wvju9
SiUS122226E Indoor Unit FVXS09/12/15/18WVJU9 Control PCB Connector for DC fan motor (PCB2) Connector for centralized control (HA) Connector for service PCB (PCB3) Connector for indoor heat exchanger thermistor (R2T) Connector for lower air outlet motor Connector for swing motor Connector for display/signal receiver PCB (PCB4) Connector for sensor PCB (PCB1) H1, H2, H3 Connector for terminal strip...
Page 42 Indoor Unit SiUS122226E Sensor PCB Connector for control PCB (PCB2) (PCB1) Room temperature thermistor 3P191450-1 Service PCB Connector for control PCB (PCB2) (PCB3) S2W(4) Switch for upward airflow limit setting Refer to page 255 for details.  Keep the other switches as factory setting. Switch for airflow selection Refer to page 54 for details.
Page 43: Cdmq07Wvju9, Fdmq09/12/15/18/24Wvju9
SiUS122226E Indoor Unit CDMQ07WVJU9, FDMQ09/12/15/18/24WVJU9 Control PCB X15A Connector for float switch (A1P) X16A Connector for room temperature thermistor (suction air thermistor) (R1T) X17A, X18A Connector for indoor heat exchanger thermistor (R2T, R3T) X25A Connector for drain pump motor X27A Connector for terminal block (for power supply) X28A Connector for power supply wiring (option)
Page 44 Indoor Unit SiUS122226E Indoor Fan PCB Connector for control PCB (A1P) (A2P) Connector for reactor Connector for DC fan motor X10A Connector for terminal block (for power supply) Fuse (5 A, 250 V) Fuse (6.3 A, 250 V) LED for service monitor (green) X10A 2P442228-16 2P442228-17...
Page 45: Ffq09/12/15/18W2Vju9
SiUS122226E Indoor Unit FFQ09/12/15/18W2VJU9 Control PCB X15A Connector for float switch (A1P) X16A Connector for room temperature thermistor (suction air thermistor) X17A, X18A Connector for indoor heat exchanger thermistor X20A Connector for DC fan motor X24A Connector for transmitter board (when the wireless remote controller (option) is used) X25A Connector for drain pump motor...
Page 46: Sensor Kit For Ffq Series
Sensor Kit for FFQ Series SiUS122226E 2. Sensor Kit for FFQ Series BRYQ60A2W(S) Outline Thermopile sensor (A4P) Pyroelectric sensor (A5P) (R25074) Thermopile Sensor (A4P) Connector 3P262610-1 Pyroelectric Sensor (A5P) Connector 3P262611-1 Part 3 Printed Circuit Board Connector Wiring Diagram...
Page 47: Wired Remote Controller
SiUS122226E Wired Remote Controller 3. Wired Remote Controller BRC1E73 Wired Remote P1, P2 Terminal for indoor unit Controller PCB Room temperature thermistor 2P619817-7 Part 3 Printed Circuit Board Connector Wiring Diagram...
Page 48: Wireless Remote Controller Receiver For Fdmq Series
Wireless Remote Controller Receiver for FDMQ series SiUS122226E 4. Wireless Remote Controller Receiver for FDMQ series BRC082A43 Wired Remote MAIN/SUB setting switch Controller PCB Refer to page 262 for details. Address setting switch Refer to page 262 for details. P1, P2 Terminal for indoor unit control PCB (A1P) 3P431101-2 Part 3 Printed Circuit Board Connector Wiring Diagram...
Page 49: Wireless Remote Controller Kit For Ffq Series
SiUS122226E Wireless Remote Controller Kit for FFQ Series 5. Wireless Remote Controller Kit for FFQ Series BRC082A41W, BRC082A42W(S) Transmitter Connector for receiver (A3P) Board (A2P) Connector for control PCB (A1P) MAIN/SUB setting switch Refer to page 265 for details. Address setting switch Refer to page 265 for details.
Page 50: Outdoor Unit
Outdoor Unit SiUS122226E 6. Outdoor Unit 2/3/4MXS-WMVJU9, 2/3MXL-WMVJU9, 2/3MXLH-WVJU9 Main PCB (PCB1) Connector for terminal block (indoor - outdoor transmission) Connector for COOL/HEAT lock Refer to page 269 for details. S20 (white) Connector for electronic expansion valve coil A port S21 (red) Connector for electronic expansion valve coil B port S22 (blue)
Page 51 SiUS122226E Outdoor Unit S20 S21 S201 V401 S202 2P454971-16 2P454971-17 2P454971-18 Part 3 Printed Circuit Board Connector Wiring Diagram...
Page 52 Outdoor Unit SiUS122226E Service Monitor S501, S502 Connector for main PCB (PCB1) PCB (PCB2) LED A LED for service monitor (green) LED1, LED2, LED for service monitor (red) LED3, LED4, LED5 Forced cooling operation ON/OFF switch Refer to page 241 for details. Operation mode switch Refer to page 241 for details.
Page 53: 5Mxs-Wvju9, 4Mxl-Wvju9, 4Mxlh-Wvju9
SiUS122226E Outdoor Unit 5MXS-WVJU9, 4MXL-WVJU9, 4MXLH-WVJU9 Main PCB (PCB1) S, S10 Connector for terminal block (indoor - outdoor transmission) Connector for COOL/HEAT lock Refer to page 269 for details. S20 (white) Connector for electronic expansion valve coil A port S21 (red) Connector for electronic expansion valve coil B port S22 (blue) Connector for electronic expansion valve coil C port...
Page 54 Outdoor Unit SiUS122226E FU10 V401 S202 S201 2P519836-10 Part 3 Printed Circuit Board Connector Wiring Diagram...
Page 55 SiUS122226E Outdoor Unit Service Monitor S501, S502 Connector for main PCB (PCB1) PCB (PCB2) LED A LED for service monitor (green) LED1, LED2, LED for service monitor (red) LED3, LED4, LED5 Forced cooling operation ON/OFF switch Refer to page 241 for details. Operation mode switch Refer to page 241 for details.
Page 56: Part 4 Functions And Control
SiUS122226E Part 4 Functions and Control 1. Common Functions ...................52 1.1 Temperature Control .................. 52 1.2 Frequency Principle..................52 2. Functions for Wall Mounted / Floor Standing Type ........54 2.1 Airflow Direction Control................54 2.2 Fan Speed Control for Indoor Unit ............. 57 2.3 Program Dry Operation ................
Page 57 SiUS122226E 4.10 Outdoor Fan Control................. 108 4.11 Liquid Compression Protection Function..........108 4.12 Defrost Control ..................108 4.13 Low Hz High Pressure Limit ..............110 4.14 Electronic Expansion Valve Control ............111 4.15 Malfunctions ..................... 116 Part 4 Functions and Control...
Page 58: Common Functions
Common Functions SiUS122226E 1. Common 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 59 SiUS122226E Common Functions  When the frequency increases, the rotation speed of the compressor increases resulting in an increase of refrigerant circulation. This leads to a larger amount of heat exchange per unit.  When the frequency decreases, the rotation speed of the compressor decreases resulting in a decrease of refrigerant circulation.
Page 60: Functions For Wall Mounted / Floor Standing Type
Functions for Wall Mounted / Floor Standing Type SiUS122226E 2. Functions for Wall Mounted / Floor Standing Type Airflow Direction Control Applicable CTXS07WVJU9 Models FTXS09/12/15/18/24WVJU9 FTXR09/12/18WVJUW(S)9 FVXS09/12/15/18WVJU9 Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum control in (Dual) Flap(s) cooling, dry and heating operation.
Page 61 SiUS122226E Functions for Wall Mounted / Floor Standing Type FVXS series Flap (up and down) Cooling/Dry Heating Upward airflow limit OFF R4003397 R4003396 Upward airflow limit ON R4003394 R4003394 3-D Airflow CTXS, FTXS, FTXR Series Alternative repetition of vertical and horizontal swing motions enables uniform air-conditioning of the entire room.
Page 62 Functions for Wall Mounted / Floor Standing Type SiUS122226E Airflow Selection FVXS Series Airflow direction can be set with the airflow selection switch. Setting  Open the front panel. „ Air is blown from the upper outlet only. The blow pattern is automatically decided „...
Page 63: Fan Speed Control For Indoor Unit
SiUS122226E Functions for Wall Mounted / Floor Standing Type 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 64: Program Dry Operation
Functions for Wall Mounted / Floor Standing Type SiUS122226E Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable. Details The microcomputer automatically sets the temperature and airflow rate.
Page 65: Automatic Cooling/Heating Changeover
SiUS122226E Functions for Wall Mounted / Floor Standing Type Automatic Cooling/Heating Changeover Outline 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.
Page 66: Thermostat Control
Functions for Wall Mounted / Floor Standing Type SiUS122226E FVXS Series Cooling Operation Target temperature + 2.5°C (+4.5°F) Target temperature – 2.0°C (–3.6°F) Target temperature + 1.5°C (+2.7°F) = Thermostat OFF = Thermostat OFF Target temperature – 3.0°C (–5.4°F) Heating Operation (R22000) Ex: When the target temperature is 25°C (77°F) Cooling →...
Page 67: Night Set Mode
SiUS122226E Functions for Wall Mounted / Floor Standing Type FTXR Series Room thermistor temperature – target temperature Zone A Zone A 1.5°C (2.7°F) Zone B Zone B 1.0°C (1.8°F) Zone C Zone C 0.5°C (0.9°F) 0°C (0°F) (R24032) FVXS Series Room thermistor temperature –...
Page 68: Econo Operation
Functions for Wall Mounted / Floor Standing Type SiUS122226E ECONO Operation Outline ECONO operation reduces the maximum operating current and the power consumption. This operation is particularly convenient for energy-saving. It is also a major bonus when breaker capacity does not allow the use of multiple electrical devices and air conditioners. It can be easily activated by pressing ECONO or Econo/Quiet button on the wireless remote controller.
Page 69: 2-Area Intelligent Eye Operation
SiUS122226E Functions for Wall Mounted / Floor Standing Type 2-Area INTELLIGENT EYE Operation Applicable FTXR09/12/18WVJUW(S)9 Models Outline The following functions can be performed by the microcomputer and a motion sensor. 1. Reduction of the capacity when there is nobody in the room in order to save electricity (energy saving operation) 2.
Page 70 Functions for Wall Mounted / Floor Standing Type SiUS122226E 2. Motions (in cooling) within within 20 min. within 20 min. 20 min. 20 min. Human detection signal ↑ ↑ ↑ Reset Reset Reset 1 ~ 2°C (1.8 ~ 3.6 °F) Target temperature Remote controller Sensor button...
Page 71: Intelligent Eye Operation
SiUS122226E Functions for Wall Mounted / Floor Standing Type INTELLIGENT EYE Operation Applicable CTXS07WVJU9 Models FTXS09/12/15/18/24WVJU9 Outline The microcomputer detects the presence of humans in the room with a motion sensor and reduces the capacity when there is nobody in the room in order to save electricity. Details 1.
Page 72: Powerful Operation
Functions for Wall Mounted / Floor Standing Type SiUS122226E Note(s) For dry operation, the temperature cannot be set with a remote controller, but the target temperature is shifted internally. 2.10 POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated by increasing the indoor fan rotating speed and the compressor frequency.
Page 73: Multi-Monitor Lamp/Timer Lamp
SiUS122226E Functions for Wall Mounted / Floor Standing Type 2.11 Multi-Monitor Lamp/TIMER Lamp Applicable FTXR09/12/18WVJUW(S)9 Models Features Current operation mode is displayed in color of the lamp of the indoor unit. Operating status can be monitored even in automatic operation in accordance with the actual operation mode. Multi-monitor lamp/ TIMER lamp (R19925)
Page 74: Clock Setting
Functions for Wall Mounted / Floor Standing Type SiUS122226E 2.12 Clock Setting ARC452 Series The clock can be set by taking the following steps: ARC466 Series 1. Press CLOCK button. 0:00is displayed, then MON and blink. 2. Press SELECT or SELECT button to set the clock to the current day of the week. 3.
Page 75: Weekly Timer Operation
SiUS122226E Functions for Wall Mounted / Floor Standing Type 2.13 WEEKLY TIMER Operation Applicable CTXS07WVJU9 Models FTXS09/12/15/18/24WVJU9 FTXR09/12/18WVJUW(S)9 FVXS09/12/15/18WVJU9 Outline 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.
Page 76 Functions for Wall Mounted / Floor Standing Type SiUS122226E f 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 77 SiUS122226E Functions for Wall Mounted / Floor Standing Type 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 78 Functions for Wall Mounted / Floor Standing Type SiUS122226E 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...
Page 79 SiUS122226E Functions for Wall Mounted / Floor Standing Type vation • The reser Setting Displays Normal 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 •...
Page 80 Functions for Wall Mounted / Floor Standing Type SiUS122226E f 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 81: Other Functions
SiUS122226E Functions for Wall Mounted / Floor Standing Type 2.14 Other Functions 2.14.1 Hot-Start Function In order to prevent the cold air blast that normally occurs when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or significantly weakened resulting in comfortable heating.
Page 82 Functions for Wall Mounted / Floor Standing Type SiUS122226E 2.14.4 Auto-restart Function If a power failure (even a momentary one) occurs during the operation, the system restarts automatically in the same conditions as before when the power supply is restored to the conditions prior to the power failure.
Page 83: Functions For Duct Concealed / Ceiling Cassette Type
SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type 3. Functions for Duct Concealed / Ceiling Cassette Type Airflow Direction Control Applicable FFQ09/12/15/18W2VJU9 Models Outline There are two types of airflow direction settings.  Automatic swing setting The flaps automatically oscillate up and down. Indoor unit (Automatic swing) (Automatic swing)
Page 84: Fan Speed Control For Indoor Unit
Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E Fan Speed Control for Indoor Unit  With Wired Remote Controller (BRC1E73) To change the fan speed, press Fan Speed button and select the fan speed from Low/Medium/High/Auto.  Auto cannot be selected if the indoor unit does not have Auto Fan speed function. ...
Page 85: Program Dry Operation
SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable. Details The microcomputer automatically sets the temperature and airflow rate.
Page 86: Clock And Calendar Setting (With Brc1E73)
Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E Clock and Calendar Setting (With BRC1E73) Press Menu/OK button to display the main menu screen. Press buttons to select Clock & Calendar on the main menu screen. Press Menu/OK button to display the clock &...
Page 87 SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type Select Hour with buttons. Change the hour with buttons. Holding down the button causes the number to change continuously. Select Minute with buttons. Change the minute with buttons. Holding down the button causes the number to change continuously.
Page 88: Schedule Timer Operation (With Brc1E73)
Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E Schedule Timer Operation (With BRC1E73) Outline Day settings are selected from 4 patterns:  7 Days  Weekday/Sat/Sun  Weekday/Weekend  Everyday Up to 5 actions can be set for each day. Details Set the startup time and operation stop time.
Page 89 SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type  Daily Patterns The schedule screen will appear. Press buttons to select Daily Patterns on the schedule screen. The daily patterns screen will appear when Menu/OK button is pressed. Press buttons to select 7 Days Weekday/Sat/Sun...
Page 90 Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E  Settings The schedule screen will appear. Press buttons to select Settings on the schedule screen. The settings screen will appear when Menu/OK button is pressed. Press buttons to select the day to be set.
Page 91 SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type Press buttons to move the highlighted item and press buttons to configure ON/OFF/-- settings. --, ON, or OFF changes in sequence when buttons are pressed. ON: The temperature setpoints can be configured. OFF: The setback temperature setpoints can be configured.
Page 92: Setback Function (With Brc1E73)
Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E  Enabling or disabling the schedule Display the schedule screen. Press buttons to select Enable / Disable on the schedule screen. Press Menu/OK button to display the enable/disable screen. Press buttons to select Enable Disable on the enable/disable...
Page 93: Drain Pump Control
SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type Drain Pump Control Normal Operation Float switch Thermostat (running) Error display Drain pump (R24037)  The float switch is ON in normal operation.  When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. ...
Page 94 Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E If Float Switch is OFF with Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 sec. 5 min. 5 sec. 5 min. 5 sec. 5 min. (R24611) ...
Page 95: Hot Start Control (In Heating Operation Only)
SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type Hot Start Control (In Heating Operation Only) Outline At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor unit fan is controlled to prevent cold air from blasting out and ensure startup capacity. Details Defrost ending or oil return ending Hot start ending conditions...
Page 96: Presence And Floor Sensors (Option)
Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E Presence and Floor Sensors (Option) Applicable FFQ09/12/15/18W2VJU9 Models Outline With the human presence signal and the floor temperature signal from the optional sensor kit, the system provides the energy saving control, or the comfortable temperature control and airflow direction control preventing the direct draft to the human.
Page 97 SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type 2. Auto-setback by sensor (with presence sensor) After pre-determined time has elapsed without detection of human presence, the unit automatically shifts the target temperature gradually for energy saving. The target temperature displayed on the remote controller remains same as the initial set value during the above change of target temperature.
Page 98 Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E 3. Auto-off by sensor (with presence sensor) After pre-determined time has elapsed without detection of human presence, the unit automatically stops operation. The auto-off time can be set between 1- 24 hours by the hour. Once the unit stops operation by auto-off function, the system would not restart even if the human is detected again.
Page 99: Other Functions
SiUS122226E Functions for Duct Concealed / Ceiling Cassette Type 4. Room temperature adjustment by sensing (with floor sensor) The system uses living space temperature calculated from temperatures detected by room temperature thermistor (suction air thermistor in the indoor unit) and floor sensor, as the target temperature.
Page 100 Functions for Duct Concealed / Ceiling Cassette Type SiUS122226E FFQ Series Emergency operation switch (R24077) Part 4 Functions and Control...
Page 101: Control Specification
SiUS122226E Control Specification 4. Control Specification Thermistor Functions Expansion valve (3) Outdoor (5) Liquid Pipe Temperature Thermistor Thermistor (2) Outdoor Heat Exchanger Thermistor Fusible plug Four way valve (1) Discharge Pipe Thermistor (7) Room (6) Indoor Heat Compressor Temperature Exchanger Thermistor Thermistor (4) Gas Pipe...
Page 102 Control Specification SiUS122226E  In case of low outdoor temperature operation, the system compares the indoor heat exchanger temperature with the liquid pipe temperature to detect disturbances in the refrigerant flow. If any, the system adjusts the opening of the electronic expansion valve to control the refrigerant flow.
Page 103: Mode Hierarchy
SiUS122226E Control Specification Mode Hierarchy Outline The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing. Details 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...
Page 104: Frequency Control
Control Specification SiUS122226E Frequency Control Outline Frequency corresponding to each room’s capacity is determined according to the difference between the target temperature and the temperature of each room. When the shift of the frequency is less than zero (ΔF<0) by PI control, the target frequency is used as the command frequency.
Page 105 SiUS122226E Control Specification D signal: Indoor frequency command The difference between the room thermistor temperature and the target temperature is taken as the D value and is used for D signal of frequency command. D D D D Temperature Temperature Temperature Temperature difference...
Page 106: Controls At Mode Changing/Start-Up
Control Specification SiUS122226E Controls at Mode Changing/Start-up 4.4.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the preheating command from the indoor unit. Details ON Condition  When the outdoor temperature is below A, the inverter operation in open phase starts. OFF Condition ...
Page 107 SiUS122226E Control Specification 4.4.5 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.  2/3/4MXS, 2/3MXL(H) (Hz) Frequency (sec.) Time (R13528) 2MXS 3/4MXS 2/3MXL(H) A (Hz)
Page 108: Discharge Pipe Temperature Control
Control Specification SiUS122226E Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the internal temperature of the compressor. If the discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep the discharge pipe temperature from rising further.
Page 109: Input Current Control
SiUS122226E Control Specification Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets the frequency upper limit based on the input current. In case of heat pump models, this control is the upper limit control of the frequency and takes priority over the lower limit control of four way valve operation compensation.
Page 110: Freeze-Up Protection Control
Control Specification SiUS122226E Freeze-up Protection Control 4.7.1 Freeze-up Protection Control (Except CDMQ, FDMQ Series) Applicable CTXS07WVJU9 Models FTXS09/12/15/18/24WVJU9 FTXR09/12/18WVJUW(S)9 FVXS09/12/15/18WVJU9 FFQ09/12/15/18W2VJU9 Outline During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. The signals from the indoor unit are divided into zones.
Page 111 SiUS122226E Control Specification 4.7.2 Freeze-up Protection Control for CDMQ, FDMQ Series Outline During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents the indoor heat exchanger from freezing. Details When the freeze-up protection control starts, the compressor stops, the airflow rate is fixed to L tap, and the drain pump turns ON.
Page 112: Heating Peak-Cut Control
Control Specification SiUS122226E Heating Peak-cut Control Outline During heating operation, the indoor heat exchanger temperature determines the frequency upper limit to prevent abnormal high pressure. Details  The operating frequency is judged with the indoor heat exchanger temperature 2 minutes after the operation starts and F seconds after the number of the rooms in operation is changed.
Page 113: High Pressure Protection Control
SiUS122226E Control Specification High Pressure Protection Control Outline In order to prevent abnormal high pressures in the system and hence avoiding activation of the high pressure safety device the below control function will be activated. Details High Pressure Protection Control 4.15 MPa Pressure Condensing...
Page 114: Outdoor Fan Control
Control Specification SiUS122226E 4.10 Outdoor Fan Control 1. Fan OFF control during defrosting The outdoor fan is turned OFF while defrosting. 2. Fan OFF delay when stopped The outdoor fan is turned OFF 60 seconds after the compressor stops. 3. Fan speed control for pressure difference upkeep The rotation speed of the outdoor fan is controlled for keeping the pressure difference during cooling operation with low outdoor temperature.
Page 115 SiUS122226E Control Specification E Hz D Hz PI control Frequency 0 Hz 0 Hz G sec. F sec. H sec. J sec. Compressor Four way valve 5 sec. 5 sec. Electronic expansion valve Normal K pulse L pulse M pulse N pulse Starting opening...
Page 116: Low Hz High Pressure Limit
Control Specification SiUS122226E 4.13 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. Details Dropping zone Reset zone Keep zone...
Page 117: Electronic Expansion Valve Control
SiUS122226E Control Specification 4.14 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Room Distribution Control 1.
Page 118 Control Specification SiUS122226E Details The following are the examples of the electronic expansion valve control for each operation mode. Operation pattern  : Available — : Not available When power is turned on Fully closed when power is turned on —...
Page 119 SiUS122226E Control Specification 4.14.1 Initialization as Power Supply On The electronic expansion valve is initialized (fully closed) when the power is turned on. Then, the valve opening position is set and the pressure is equalized. 4.14.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens, and develops the pressure equalization.
Page 120 Control Specification SiUS122226E 4.14.8 Discharge Pipe Thermistor Disconnection Control 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 electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.
Page 121 SiUS122226E Control Specification 4.14.10 SC (Subcooling) Control Outline The liquid pipe temperature and the heat exchanger temperature are detected and the electronic expansion valve opening is compensated so that the SC of each room becomes the target SC.  When the actual SC > target SC, open the electronic expansion valve of the room. ...
Page 122: Malfunctions
Control Specification SiUS122226E 4.15 Malfunctions 4.15.1 Sensor Malfunction Detection Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Gas pipe thermistor 5. Outdoor temperature thermistor 6. Liquid pipe thermistor 4.15.2 Detection of Overcurrent and Overload Outline In order to protect the inverter, an excessive output current is detected and the OL temperature is observed to protect the compressor.
Page 123: Part 5 Remote Controller
SiUS122226E Part 5 Remote Controller 1. Applicable Remote Controller ..............118 2. ARC452A21 ....................119 3. ARC466A36 ....................121 4. ARC466A21 ....................123 5. BRC944B2 ....................125 6. BRC1E73 ....................126 7. BRC082A43 ....................132 8. BRC082A41W, BRC082A42W(S)............134 Part 5 Remote Controller...
Page 124: Applicable Remote Controller
FFQ15W2VJU9 FFQ18W2VJU9 Note Refer to the operation manual of applicable model for details. You can download operation manuals from Daikin Business Portal: Daikin Business Portal  Document Search  Item Category  Installation/Operation Manual (URL: https://global1d.daikin.com/business_portal/login/) Part 5 Remote Controller...
Page 125: Arc452A21
SiUS122226E ARC452A21 2. ARC452A21 Signal transmitter Receiver Display (LCD) • Displays the current settings. • To use the remote controller, aim the (In this illustration, each section is transmitter at the indoor unit. If there shown with all its displays on for the is anything to block signals between purpose of explanation.) the unit and the remote controller,...
Page 126 ARC452A21 SiUS122226E Open the Front Cover MODE button • Selects the operation mode. AUTO COOL HEAT 4 ECONO button • Starts ECONO operation. QUIET button 5 SWING buttons • Starts OUTDOOR UNIT • Adjusts the airflow direction. QUIET operation. • When you press SWING •...
Page 127: Arc466A36
SiUS122226E ARC466A36 3. ARC466A36 Signal transmitter Receiver 19-11/16" Display (LCD) (50 cm) or more • Displays the current settings. (In this illustration, each section is shown with all its displays on for the • T o use the remote controller, aim the purpose of explanation.) transmitter at the indoor unit.
Page 128 ARC466A36 SiUS122226E Open the Front Cover Mode button • Selects the operation mode. AUTO COOL HEAT 4 Econo / Quiet button • Every time you press Econo/Quiet button, the setting changes in the following order. Lamp brightness ECONO OUTDOOR UNIT setting button QUIET •...
Page 129: Arc466A21
SiUS122226E ARC466A21 4. ARC466A21 Signal transmitter Display (LCD) • Displays the current settings. (In this illustration, each section is shown with all its displays on for the Receiver purpose of explanation.) Temperature • T o use the remote controller, aim the adjustment buttons transmitter at the indoor unit.
Page 130 ARC466A21 SiUS122226E Open the Front Cover Mode button • Selects the operation mode. AUTO COOL HEAT 2 ECONO button • Starts ECONO operation. 3 Swing button Quiet button • Adjusts the airflow direction. • Starts OUTDOOR UNIT QUIET operation. • When you press Swing •...
Page 131: Brc944B2
SiUS122226E BRC944B2 5. BRC944B2 R5000214 Caution This remote controller cannot be used together with a standard wireless remote controller. Otherwise, what appears on this remote controller's display may fail to correspond to actual operating conditions. Part 5 Remote Controller...
Page 132: Brc1E73
BRC1E73 SiUS122226E 6. BRC1E73 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. Fan speed control button Part 5 Remote Controller...
Page 133 SiUS122226E BRC1E73 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 •...
Page 134 BRC1E73 SiUS122226E Liquid Crystal Display • Three types of display mode (Standard, Detailed and Simple) are available. • Standard display is set by default. • Detailed and Simple displays can be selected in the main menu. Standard display 10.Changeover controlled 11.Setback by the master indoor unit 9.Under centralized...
Page 135 SiUS122226E BRC1E73 Simple display 1.Operation mode 14.Selectable Display Item 3.Setpoint 11.Setback 2.Fan speed 4.Stand by for Defrost/ <Simple display example> Hot start Note for all display modes • Depending on the field settings, while the indoor unit is stopped, OFF may be displayed instead of the operation mode and/or the setpoint may not be displayed.
Page 136 BRC1E73 SiUS122226E 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 •...
Page 137 SiUS122226E BRC1E73 11. Setback “ ” The setback icon flashes when the unit is • turned on by the setback control. 12. Airflow Direction “ ” Displayed when the airflow direction and • swing are set. If the connected indoor unit model does not •...
Page 138: Brc082A43
BRC082A43 SiUS122226E 7. BRC082A43 ON OFF ON OFF TEMP TIME DOWN DOWN RESERVE CANCEL TIMER MODE TEST TEST TEST The situation which opened the front cover of the remote control (R25006) (R25007) Part 5 Remote Controller...
Page 139 SiUS122226E BRC082A43 TIMER MODE START/STOP BUTTON DISPLAY “ ” “ I ” (SIGNAL TRANSMISSION) Use this button for TIMER MODE setting. This lights up when a signal is being transmitted. TIMER RESERVE/CANCEL BUTTON DISPLAY “ ” “ ” “ ” “ ”...
Page 140: Brc082A41W, Brc082A42W(S)
BRC082A41W, BRC082A42W(S) SiUS122226E 8. BRC082A41W, BRC082A42W(S) (R23936) (R23937) Part 5 Remote Controller...
Page 141 SiUS122226E BRC082A41W, BRC082A42W(S) TIMER MODE START/STOP BUTTON DISPLAY (SIGNAL TRANSMISSION) TIMER RESERVE/CANCEL BUTTON This lights up when a signal is being transmitted. AIRFLOW DIRECTION ADJUST BUTTON DISPLAY OPERATION MODE SELECTOR BUTTON (OPERATION MODE) Press this button to select OPERATION MODE. This display shows the current OPERATION MODE.
Page 142: Part 6 Service Diagnosis
SiUS122226E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........138 2. Troubleshooting with LED ...............139 2.1 Indoor Unit....................139 2.2 Outdoor Unit ..................... 141 3. Service Diagnosis ...................142 3.1 ARC452 Series..................142 3.2 ARC466 Series..................145 3.3 BRC1E73 ....................148 3.4 BRC082A43, BRC082A41W, BRC082A42W(S)........
Page 143 SiUS122226E 7.4 Unspecified Voltage (Between Indoor Unit and Outdoor Unit), Anti-icing Control in Other Rooms............191 7.5 Anti-icing Control for Indoor Unit .............. 192 7.6 Outdoor Unit PCB Abnormality..............194 7.7 Actuation of High Pressure Switch ............195 7.8 OL Activation (Compressor Overload) ............. 197 7.9 Compressor Lock ..................
Page 144: General Problem Symptoms And Check Items
General Problem Symptoms and Check Items SiUS122226E 1. General Problem Symptoms and Check Items Reference Symptom Check Item Details Page None of the units Check the power supply. Check if the rated voltage is supplied. — operates. Check the types of the indoor Check if the indoor unit type is compatible —...
Page 145: Troubleshooting With Led
SiUS122226E Troubleshooting with LED 2. Troubleshooting with LED Indoor Unit Operation Lamp Check the interval time between blinks of the OPERATION lamp. Blink every 2 to 3 seconds If the operation mode is different from the operation mode of the indoor unit in another room, the OPERATION lamp may blink and operation may not be performed, or operation may stop while in progress.
Page 146 Troubleshooting with LED SiUS122226E CDMQ, FDMQ, FFQ series with BRC1E73 wired remote controller Operation lamp (green) #The error or warning message also blinks on the basic screen. R4003516 CDMQ, FDMQ series with BRC082A43 wireless remote controller In case of wireless remote controller, a receiver is installed. When the error occurs, the operation lamp on the receiver blinks.
Page 147: Outdoor Unit
SiUS122226E Troubleshooting with LED 2. If not, set all the indoor units to the same operation mode and confirm that the operation lamp is not blinking. 3. Moreover, when the operation mode is automatic, set all the indoor unit operation mode as cooling or heating and check again if the operation lamp is normal.
Page 148: Service Diagnosis
Service Diagnosis SiUS122226E 3. Service Diagnosis ARC452 Series 3.1.1 Method 1 1. When TIMER CANCEL button is held down for 5 seconds, 00 is displayed on the temperature display screen. 2. Press TIMER CANCEL button repeatedly until a long beep sounds. TIMER CANCEL button <...
Page 149 SiUS122226E Service Diagnosis 3.1.2 Method 2 1. Press the 3 buttons (TEMP, TEMP, MODE) at the same time to enter the diagnosis mode. (R14550) The left-side number blinks. (R9430) 2. Press TEMP or TEMP button and change the number until you hear the two consecutive beeps or the long beep.
Page 150 Service Diagnosis SiUS122226E 5. Press TEMP or TEMP button and change the number until you hear the long beep. (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 151: Arc466 Series
SiUS122226E Service Diagnosis ARC466 Series 3.2.1 Method 1 1. When Timer Cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen. 2. Press Timer Cancel button repeatedly until a long beep sounds. Timer Cancel button (R24045) <...
Page 152 Service Diagnosis SiUS122226E 3.2.2 Method 2 1. Press the center of Temp button and Mode button at the same time. (R24046) SC is displayed on the LCD. R6000375 2. Select SC (service check) with Temp or Temp button. 3. Press Mode button to enter the service check mode. (R24047) The left-side number blinks.
Page 153 SiUS122226E Service Diagnosis  Long beep: Both the left-side and right-side numbers correspond with the error code. The numbers indicated when you hear the long beep are the error code. Refer to page 154, 155. 6. Press Mode button. (R24047) The right-side number blinks.
Page 154: Brc1E73
Service Diagnosis SiUS122226E BRC1E73 Relations On power-up, the message “Checking the connection. Please standby.” will be displayed on the Between Modes remote controller screen temporarily and then the basic screen will be displayed. To access a mode from the basic screen, refer to the figure below. When any of the operation buttons is pressed, the backlight will come on and remain lit for about 30 seconds.
Page 155 The error code will flash and the service Error Code: A1 Contact Info contact and model name or code may 0123-456-7890 be displayed. Indoor Model ---/000 Notify your Daikin dealer of the Error Outdoor Model ---/000 code and model name or code. Part 6 Service Diagnosis...
Page 156: Brc082A43, Brc082A41W, Brc082A42W(S)
Service Diagnosis SiUS122226E BRC082A43, BRC082A41W, BRC082A42W(S) Relations The following modes can be selected by using INSPECTION/TEST OPERATION button on the Between Modes remote controller. Service data can be obtained. Indoor unit settings can be made. Press INSPECTION/TEST z Error code history z Filter cleaning sign time OPERATION button for Field...
Page 157 SiUS122226E Service Diagnosis Step Action Press UP or DOWN button and change the UNIT No. until the indoor unit starts to beep. UP button DOWN button (R15408) If you hear... Then... 3 short beeps Follow all steps below. o l l operation in step 4 until you hear a long beep.
Page 158 Service Diagnosis SiUS122226E Step Action Press UP or DOWN button to change the error code upper digit until the indoor unit beeps. DOWN UP button DOWN button (R15411) If you hear... Then... 2 short beeps The upper digit matches. s t i s t i Press OPERATION MODE SELECTOR button.
Page 159 SiUS122226E Service Diagnosis Step Action Press UP or DOWN button and change the error code lower digit until the indoor unit generates long beep. DOWN UP button DOWN button (R15413) If you hear... Then... 2 short beeps No digits match. s t i Press OPERATION MODE SELECTOR button to return to the normal mode.
Page 160: Code Indication On Remote Controller
Code Indication on Remote Controller SiUS122226E 4. Code Indication on Remote Controller Wall Mounted/Floor Standing Type Error Reference Description Codes Page Normal condition — Indoor unit PCB abnormality Freeze-up protection control/heating peak-cut control Indoor fan motor (DC motor) or related abnormality Indoor heat exchanger thermistor or related abnormality Front panel open/close fault (FTXR series) Room temperature thermistor or related abnormality...
Page 161: Outdoor Unit
SiUS122226E Code Indication on Remote Controller Outdoor Unit i: ON, h: OFF, j: Blinks Outdoor Unit LED Indication Error Reference Description Green Codes Page Normal condition — Unspecified voltage (between indoor unit and outdoor unit) Anti-icing control in other rooms (U0) Refrigerant shortage Low-voltage detection or over-voltage detection...
Page 162: Troubleshooting For Wall Mounted/Floor Standing Type
Troubleshooting for Wall Mounted/Floor Standing Type SiUS122226E 5. Troubleshooting for Wall Mounted/Floor Standing Type 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 163 SiUS122226E Troubleshooting for Wall Mounted/Floor Standing Type Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Combination of the Match the compatible indoor and outdoor unit models. matched? * To secure the connection, Check the connection of disconnect the connectors once connectors.
Page 164: Freeze-Up Protection Control/Heating Peak-Cut Control
Troubleshooting for Wall Mounted/Floor Standing Type SiUS122226E Freeze-up Protection Control/Heating Peak-cut Control Error Code Method of Error  Freeze-up protection control 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 165: Indoor Fan Motor (Dc Motor) Or Related Abnormality
SiUS122226E Troubleshooting for Wall Mounted/Floor Standing Type Indoor Fan Motor (DC Motor) or Related Abnormality Error Code Method of Error The rotation speed detected by the Hall IC during indoor fan motor operation determines abnormal Detection 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 166 Troubleshooting for Wall Mounted/Floor Standing Type SiUS122226E 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. Is the voltage fluctuation Correct the power within ±10% from supply.
Page 167 SiUS122226E Troubleshooting for Wall Mounted/Floor Standing Type Note The rotation pulse is the feedback signal from the indoor fan motor. Reference Check No.02 Refer to P. 225 Part 6 Service Diagnosis...
Page 168: Thermistor Or Related Abnormality
Troubleshooting for Wall Mounted/Floor Standing Type SiUS122226E Thermistor or Related Abnormality C4, C9 Error Code Method of Error The temperatures detected by the thermistors determine thermistor errors. Detection Error Decision The voltage between the both ends of the thermistor is either 4.96 V or more, or 0.04 V or less with Conditions the power on.
Page 169: Front Panel Open/Close Fault
SiUS122226E Troubleshooting for Wall Mounted/Floor Standing Type Front Panel Open/Close Fault Applicable FTXR09/12/18WVJUW(S)9 Models Error Code Error Decision  If the error repeats, the system is shut down. Conditions Supposed  Defective reduction motor Causes  Malfunction or deterioration of the front panel mechanism ...
Page 170: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)
Troubleshooting for Wall Mounted/Floor Standing Type SiUS122226E Signal Transmission Error (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The signal transmission data received from the outdoor unit is checked whether it is normal. Detection Error Decision The data sent from the outdoor unit cannot be received normally, or the content of the data is Conditions abnormal.
Page 171 SiUS122226E Troubleshooting for Wall Mounted/Floor Standing Type 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. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the connection wires...
Page 172 Troubleshooting for Wall Mounted/Floor Standing Type SiUS122226E Reference Check No.11 Refer to P.226 Part 6 Service Diagnosis...
Page 173: Mismatching Of Indoor Unit And Outdoor Unit
SiUS122226E Troubleshooting for Wall Mounted/Floor Standing Type Mismatching of Indoor Unit and Outdoor Unit Error Code Method of Error The supply power is detected for its requirements (pair type is different from multi type) by the Detection indoor/outdoor transmission signal. Error Decision The pair type and multi type are interconnected.
Page 174: Troubleshooting For Duct Concealed/Ceiling Cassette Type
Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E 6. Troubleshooting for Duct Concealed/Ceiling Cassette Type Indoor Unit PCB Abnormality Error Code Method of Error The system checks the data from EEPROM. Detection Error Decision When the data from the EEPROM is not received correctly Conditions EEPROM (Electrically Erasable Programmable Read Only Memory): A memory chip that holds its content without power.
Page 175: Drain Level Control System Abnormality
SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type 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 Supposed ...
Page 176: Indoor Fan Motor Or Related Abnormality
Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E Indoor Fan Motor or Related Abnormality 6.3.1 Indoor Fan Motor (DC Motor) or Related Abnormality Applicable CDMQ07WVJU9 Models FDMQ09/12/15/18/24WVJU9 Error Code Method of Error  Detection from the current flow on the fan PCB Detection ...
Page 177 SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type Continued from the previous page Turn ON the power supply while the fan motor connector ( 1) is disconnected. The HAP lamp on the indoor unit control PCB is blinking while the HAP lamp on the fan PCB is not blinking.
Page 178 Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E 6.3.2 Indoor Fan Motor (DC Motor) or Related Abnormality Applicable FFQ09/12/15/18W2VJU9 Models Error Code Method of Error The rotation speed detected by the Hall IC during indoor fan motor operation determines abnormal Detection fan motor operation.
Page 179 SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type 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. Is the voltage fluctuation within Correct the power ±10% from the rated supply.
Page 180 Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E Reference Check No.02 Refer to P. 225 Part 6 Service Diagnosis...
Page 181: Indoor Fan Pcb Abnormality
SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type Indoor Fan PCB Abnormality Applicable CDMQ07WVJU9 Models FDMQ09/12/15/18/24WVJU9 Error Code Method of Error Microcomputer checks the voltage state of the fan PCB. Detection Error Decision Overvoltage or voltage drop is detected on the fan PCB. Conditions Supposed ...
Page 182: Humidifier Or Related Abnormality
Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E Humidifier or Related Abnormality Error Code Method of Error Water leakage from humidifier(s) is detected based on the float switch ON/OFF changeover while Detection the system is not operating. Error Decision The float switch changes from ON to OFF while the system is OFF Conditions Supposed ...
Page 183: Thermistor Or Related Abnormality
SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type 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 is disconnected or shorted while the unit is running. Conditions Supposed ...
Page 184: Presence Sensor Or Floor Sensor Abnormality
Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E Presence Sensor or Floor Sensor Abnormality Applicable FFQ09/12/15/18W2VJU9 Models Error Code Method of Error The system detects abnormality by the output signal from the sensor(s). Detection Error Decision The sensor is disconnected or shorted while the unit is running. Conditions Supposed ...
Page 185: Remote Controller Thermistor Abnormality
SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type Remote Controller Thermistor Abnormality Error Code Method of Error Even if remote controller thermistor is faulty, system is possible to operate by system thermistor. Detection Malfunction detection is carried out by the temperature detected by the remote controller thermistor.
Page 186: Signal Transmission Error (Between Indoor And Outdoor Unit)
Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E Signal Transmission Error (Between Indoor and Outdoor Unit) Error Code Method of Error The signal transmission data from the outdoor unit is checked whether it is normal. Detection Error Decision The data sent from the outdoor unit cannot be received normally, or the content of the data is Conditions abnormal.
Page 187 SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type 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. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the connection wires...
Page 188: Signal Transmission Error (Between Indoor Unit And Remote Controller)
Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E 6.10 Signal Transmission Error (Between Indoor Unit and Remote Controller) Error Code Method of Error In case of controlling 1 indoor unit with 2 remote controllers, check the system using microcomputer Detection if signal transmission between indoor unit and remote controller (main and sub) is normal. Error Decision Normal transmission does not continue for specified period.
Page 189: Signal Transmission Error (Between Main/Sub Remote Controllers)
SiUS122226E Troubleshooting for Duct Concealed/Ceiling Cassette Type 6.11 Signal Transmission Error (Between MAIN/SUB Remote Controllers) Error Code Method of Error In case of controlling 1 indoor unit with 2 remote controllers, check the system using microcomputer Detection if signal transmission between MAIN remote controller and SUB remote controller is normal. Error Decision Normal transmission does not continue for specified period.
Page 190: Mismatching Of Indoor Unit And Outdoor Unit
Troubleshooting for Duct Concealed/Ceiling Cassette Type SiUS122226E 6.12 Mismatching of Indoor Unit and Outdoor Unit Error Code Error Decision Improper combination of indoor and outdoor units Conditions Supposed  Defective indoor unit PCB Causes  Indoor-outdoor unit transmission wiring error ...
Page 191: Troubleshooting For Outdoor Unit
SiUS122226E Troubleshooting for Outdoor Unit 7. Troubleshooting for Outdoor Unit Refrigerant Shortage Error Code Outdoor Unit LED A j 1 h 2 h 3 i 4 i 5 h Display Method of Error Refrigerant shortage is detected by checking the input current value and the compressor running Detection frequency.
Page 192 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the installation space. Check No. 17 Change the installation Check the installation location or direction. condition.
Page 193 SiUS122226E Troubleshooting for Outdoor Unit Continued from the previous page Check No. 12 Electronic expansion valve Replace the electronic functioning? expansion valve. Change for a specified amount of fresh refrigerant. Refrigerant shortage error again? Check No. 01 Replace the defective Check the thermistors.
Page 194: Low-Voltage Detection Or Over-Voltage Detection
Troubleshooting for Outdoor Unit SiUS122226E Low-voltage Detection or Over-voltage Detection Error Code Outdoor Unit LED A j 1 i 2 h 3 h 4 i 5 h Display Method of Error  Indoor Unit Detection The zero-cross detection of the power supply is evaluated by the indoor unit PCB. ...
Page 195 SiUS122226E 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. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the connection of the compressor harness.
Page 196: Wiring Error Check Unexecuted
Troubleshooting for Outdoor Unit SiUS122226E Wiring Error Check Unexecuted Error Code Outdoor Unit LED A j 1 h 2 i 3 h 4 h 5 h Display Method of Error The system checks if wiring error check is executed after clearing the memory. Detection Error Decision An error is determined when the unit is operated by the remote controller without executing wiring...
Page 197: Unspecified Voltage (Between Indoor Unit And Outdoor Unit), Anti-Icing Control In Other Rooms
SiUS122226E Troubleshooting for Outdoor Unit Unspecified Voltage (Between Indoor Unit and Outdoor Unit), Anti-icing Control in Other Rooms UA, UH Error Code Outdoor Unit LED A j 1 h 2 h 3 h 4 h 5 h Display Method of Error A wrong connection is detected by checking the combination of indoor and outdoor units on the Detection microcomputer.
Page 198: Anti-Icing Control For Indoor Unit
Troubleshooting for Outdoor Unit SiUS122226E Anti-icing Control for Indoor Unit Error Code Outdoor Unit LED A j 1 i 2 h 3 i 4 i 5 h Display Method of Error During cooling operation, indoor unit icing is detected by checking the temperatures sensed by the Detection indoor heat exchanger thermistor and room temperature thermistor that are located in a shut-down room.
Page 199 SiUS122226E 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 wiring and piping. Wrong wiring or Activate the wiring error check piping? function. Check No.
Page 200: Outdoor Unit Pcb Abnormality
Troubleshooting for Outdoor Unit SiUS122226E Outdoor Unit PCB Abnormality Error Code Outdoor Unit LED A j 1 i 2 i 3 i 4 h 5 h Display Method of Error Detect within the program of the microcomputer. Detection Error Decision The program of the microcomputer is in abnormal running order.
Page 201: Actuation Of High Pressure Switch
SiUS122226E Troubleshooting for Outdoor Unit Actuation of High Pressure Switch Error Code Outdoor Unit LED A j 1 i 2 h 3 h 4 h 5 h Display Method of Error Abnormality is detected when the contact of the high pressure switch opens. Detection Error Decision ...
Page 202 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Open the stop valve. Stop valve open? High pressure switch Reconnect the connector. connector S40 properly connected? Disconnect the connector S40 from the PCB.
Page 203: Ol Activation (Compressor Overload)
SiUS122226E Troubleshooting for Outdoor Unit OL Activation (Compressor Overload) Error Code Outdoor Unit LED A j 1 i 2 h 3 i 4 h 5 h Display Method of Error A compressor overload is detected through compressor OL. Detection Error Decision ...
Page 204 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Discharge pipe Insert the thermistor in thermistor disconnected? position. Check No. 01 Check the discharge pipe Replace the discharge pipe thermistor.
Page 205 SiUS122226E Troubleshooting for Outdoor Unit Reference Check No.01 Refer to P.224 Reference Check No.12 Refer to P.227 Reference Check No.13 Refer to P.228 Reference Check No.14 Refer to P.229 Part 6 Service Diagnosis...
Page 206: Compressor Lock
Troubleshooting for Outdoor Unit SiUS122226E Compressor Lock Error Code Outdoor Unit LED A j 1 h 2 i 3 i 4 h 5 h Display Method of Error A compressor lock is detected by checking the compressor running condition through the position Detection detection circuit.
Page 207 SiUS122226E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. (Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Stop valve Open the stop valve.
Page 208: Dc Fan Lock
Troubleshooting for Outdoor Unit SiUS122226E 7.10 DC Fan Lock Error Code Outdoor Unit LED A j 1 i 2 i 3 i 4 i 5 h Display Method of Error An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Detection Error Decision ...
Page 209: Input Overcurrent Detection
SiUS122226E Troubleshooting for Outdoor Unit 7.11 Input Overcurrent Detection Error Code Outdoor Unit LED A j 1 h 2 i 3 h 4 i 5 h Display Method of Error Detected by checking the input current value Detection Error Decision ...
Page 210 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. * An input overcurrent may result from wrong internal wiring. If the system is interrupted by an input overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
Page 211: Four Way Valve Abnormality
SiUS122226E Troubleshooting for Outdoor Unit 7.12 Four Way Valve Abnormality Error Code Outdoor Unit LED A j 1 i 2 h 3 h 4 h 5 h Display Method of Error The liquid pipe thermistor and the outdoor heat exchanger thermistor are checked to see if they Detection function within their normal ranges in the operating mode.
Page 212 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Four way valve coil disconnected (loose)? Correct the four way valve coil. Harness Reconnect the harness. disconnected? Check the continuity of the four way valve coil and harness.
Page 213: Discharge Pipe Temperature Control
SiUS122226E Troubleshooting for Outdoor Unit 7.13 Discharge Pipe Temperature Control Error Code Outdoor Unit LED A j 1 i 2 h 3 i 4 h 5 h Display Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision ...
Page 214: High Pressure Control In Cooling
Troubleshooting for Outdoor Unit SiUS122226E 7.14 High Pressure Control in Cooling Error Code Outdoor Unit LED A j 1 i 2 h 3 i 4 i 5 h Display Method of Error High pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the Detection temperature sensed by the outdoor heat exchanger thermistor exceeds the limit.
Page 215 SiUS122226E 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 installation space. Check No. 17 Check the installation Change the installation condition. location or direction. Clean the outdoor heat exchanger.
Page 216: Compressor Sensor System Abnormality
Troubleshooting for Outdoor Unit SiUS122226E 7.15 Compressor Sensor System Abnormality Error Code Outdoor Unit LED A j 1 i 2 i 3 h 4 h 5 h Display Method of Error  The system checks the power supply voltage and the DC voltage before the compressor starts. Detection ...
Page 217 SiUS122226E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Check the connection of the reactor. Connection OK? Connect the reactor properly. Check the connection of the compressor.
Page 218: Position Sensor Abnormality
Troubleshooting for Outdoor Unit SiUS122226E 7.16 Position Sensor Abnormality Error Code Outdoor Unit LED A j 1 i 2 i 3 h 4 h 5 h Display Method of Error A compressor start-up failure is detected by checking the compressor running condition through the Detection position detection circuit.
Page 219 SiUS122226E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn on the power. Check the electrolytic capacitor voltage. + 100 Within 320 VDC? Replace the outdoor unit - 50 PCB (main PCB).
Page 220 Troubleshooting for Outdoor Unit SiUS122226E Reference Check No.15 Refer to P.229 Reference Check No.18 Refer to P.232 Reference Check No.20 Refer to P.233 Part 6 Service Diagnosis...
Page 221: Thermistor Or Related Abnormality (Outdoor Unit)
SiUS122226E Troubleshooting for Outdoor Unit 7.17 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, J8, J9, P4 Error Code Outdoor Unit LED A j 1 i 2 i 3 h 4 h 5 h Display Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. Detection A thermistor fault is identified based on the temperature sensed by each thermistor.
Page 222 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting In case of H9, J3, J6, J8, J9 Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn on the power again. Error displayed again on remote controller? Reconnect the connectors or thermistors.
Page 223: Electrical Box Temperature Rise
SiUS122226E Troubleshooting for Outdoor Unit 7.18 Electrical Box Temperature Rise Error Code Outdoor Unit LED A j 1 i 2 i 3 h 4 i 5 h Display Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the Detection compressor off.
Page 224 Troubleshooting for Outdoor Unit SiUS122226E Reference Check No.17 Refer to P.232 Reference Check No.19 Refer to P.233 Part 6 Service Diagnosis...
Page 225: Radiation Fin Temperature Rise
SiUS122226E Troubleshooting for Outdoor Unit 7.19 Radiation Fin Temperature Rise Error Code Outdoor Unit LED A j 1 h 2 h 3 h 4 i 5 h Display Method of Error A radiation fin temperature rise is detected by checking the radiation fin temperature with the Detection compressor on.
Page 226 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Then, turn on the power to restart the system. Has the PCB Error displayed Check if silicone grease is been replaced?
Page 227: Output Overcurrent Detection
SiUS122226E Troubleshooting for Outdoor Unit 7.20 Output Overcurrent Detection Error Code Outdoor Unit LED A j 1 h 2 h 3 i 4 h 5 h Display Method of Error An output overcurrent is detected by checking the current that flows in the inverter DC section. Detection Error Decision ...
Page 228 Troubleshooting for Outdoor Unit SiUS122226E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
Page 229 SiUS122226E Troubleshooting for Outdoor Unit Reference Check No.17 Refer to P.232 Reference Check No.18 Refer to P.232 Reference Check No.22 Refer to P.237 Part 6 Service Diagnosis...
Page 230: Check
Check SiUS122226E 8. Check Thermistor Resistance Check Check No.01 Measure the resistance of each thermistor using multimeter. The resistance values are defined by below table. If the measured resistance value does not match the listed value, the thermistor must be replaced. ...
Page 231: Indoor Fan Motor Connector Check
SiUS122226E Check Indoor Fan Motor Connector Check Check No.02 CTXS, FTXS, FTXR, FVXS 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 232: Power Supply Waveform Check
Check SiUS122226E FFQ Series 1. Check the connection of connector. 2. Check motor power supply voltage output (pins 5 - 8). 3. Check motor control voltage (pins 5 - 4). 4. Check rotation command voltage output (pins 5 - 3). X20A Motor power supply voltage (290 ~ 330 VDC) Unused...
Page 233: Electronic Expansion Valve Check
SiUS122226E Check Electronic Expansion Valve Check Check No.12 Conduct the followings to check the electronic expansion valve (EV). 1. Check if the EV connector is correctly inserted in the PCB. Match the EV unit number and the connector number. 2. Turn the power off and on again, and check if all the EVs generate latching sound. 3.
Page 234: Four Way Valve Performance Check
Check SiUS122226E Four Way Valve Performance Check Check No.13 < Caution on resetting the power supply > Be sure to wait for 30 sec. or more after turning off the power. Turn off the power and turn it on again. voltage at 0 VDC Replace the outdoor unit with the outdoor unit...
Page 235: Inverter Unit Refrigerant System Check
SiUS122226E Check Inverter Unit Refrigerant System Check Check No.14 Refrigerant system check Is the discharge pipe Reconnect the thermistor. thermistor disconnected from the holder? Check for refrigerant leakage. See the section on refrigerant shortage detection. Replace the refrigerant. (R18870) Inverter Analyzer Check Check No.15 ...
Page 236 Check SiUS122226E (2) Connect the terminals to the (1) Remove the terminals from terminals of the inverter the compressor. analyzer. Compressor Compressor Inverter analyzer Be careful not to let the terminals (U,V,W) touch each other. Otherwise, high voltage is applied. (R22731) Reference: If the terminals of the compressor are not FASTON terminals (difficult to remove the wire on the...
Page 237: Outdoor Fan Motor Check
SiUS122226E Check Outdoor Fan Motor Check Check No.16 2/3/4MXS, 2/3MXL(H) Make sure that the voltage of 320 ± 30 V is applied. 1. Set operation OFF and power OFF. Disconnect the connector S70. 2. Check that the voltage between the pins 4 - 7 is 320 VDC. 3.
Page 238: Installation Condition Check
Check SiUS122226E 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.
Page 239: Outdoor Fan System Check
SiUS122226E Check 8.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor lead the outdoor fan wire connector Go to Check No. 16. running? disconnected? Outdoor fan system is functioning. Reconnect the connector. (R21195) 8.12 Main Circuit Short Check Check No.20 Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is about...
Page 240 Check SiUS122226E 2/3/4MXS, 2/3MXL(H) Multimeter (R24592) 5MXS, 4MXL(H) 1. Turn the power off. 2. Remove the top plate (10 screws). 3. Remove the right side plate (6 screws). 4. Remove the front plate (1 screw).  The front plate is heavy, so take care. 5.
Page 241 SiUS122226E Check  Pull the PCB upward to remove. Top plate Right side plate Hooks Front plate Shield plate R6000584 „ Front side „ Rear side Multimeter R6000583 Part 6 Service Diagnosis...
Page 242: Capacitor Voltage Check
Check SiUS122226E 8.13 Capacitor Voltage Check Check No.21 2/3/4MXS, 2/3MXL(H) 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.
Page 243: Power Module Check
SiUS122226E Check 8.14 Power Module Check Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is about 0 V before checking.  Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.
Page 244 Check SiUS122226E 5MXS, 4MXL(H) DC– R6000526 Part 6 Service Diagnosis...
Page 245: Part 7 Trial Operation And Field Settings
SiUS122226E Part 7 Trial Operation and Field Settings 1. Pump Down Operation................240 2. Forced Cooling Operation ...............241 3. Wiring Error Check Function ..............243 4. Trial Operation ..................245 4.1 Wall Mounted/Floor Standing Type ............245 4.2 Duct Concealed/Ceiling Cassette Type............ 247 5.
Page 246: Pump Down Operation
Pump Down Operation SiUS122226E 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit. Details  2/3/4MXS, 2/3MXL(H) 1. Remove the valve cap from liquid stop valve and gas stop valve. 2.
Page 247: Forced Cooling Operation
SiUS122226E Forced Cooling Operation 2. Forced Cooling Operation Outline The forced cooling operation is allowed when both the following conditions are met. 1. The outdoor unit is not abnormal and not in the 3-minute standby mode. 2. The outdoor unit is not operating. Protection functions have priority over all other functions during forced cooling operation.
Page 248 Forced Cooling Operation SiUS122226E •Switch SW5 and SW6 to off. Service monitor PCB Remove the switch cover COOL Screw COOL HEAT Operation mode switch (SW2) •Set to COOL. COOL HEAT Forced operation switch (SW1) R7000217 Part 7 Trial Operation and Field Settings...
Page 249: Wiring Error Check Function
SiUS122226E Wiring Error Check Function 3. Wiring Error Check Function Outline 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 on the outdoor unit.
Page 250 Wiring Error Check Function SiUS122226E Details  Wiring error check is realized by feeding refrigerant one by one through each piping port and detecting indoor heat exchanger temperature with the indoor heat exchanger thermistor in each room to see if the temperature changes in correct order. ...
Page 251: Trial Operation
SiUS122226E Trial Operation 4. Trial Operation Wall Mounted/Floor Standing Type Outline Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as flap movement, are working properly. Trial operation should be carried out in either cooling or heating operation. Procedure 1.
Page 252 Trial Operation SiUS122226E ARC466 Series 1. Press the center of Temp button and Mode button at the same time. 2. Select T (trial operation) with Tempor Tempbutton and press Mode button for confirmation. 3. Press On/Off button to turn on the system. ...
Page 253: Duct Concealed/Ceiling Cassette Type
SiUS122226E Trial Operation Duct Concealed/Ceiling Cassette Type Outline  Make sure to install the decoration panel before carrying out trial operation if the wireless remote controller is used (FFQ series only).  Trial operation should be carried out in either cooling or heating operation. 1.
Page 254 Trial Operation SiUS122226E With BRC1E73 Wired Remote Controller 1. Set to COOL or HEAT operation using the Basic screen remote controller. Cool Set to 2. Press and hold Cancel button for 4 seconds Press and hold Cancel or longer. Service settings menu is button for 4 seconds or displayed.
Page 255 SiUS122226E Trial Operation With BRC082A43, BRC082A41W, BRC082A42W(S) Wireless Remote Controller 1. Press button and select the COOL or HEAT operation. 2. Press button twice. “TEST” is displayed. 3. Press button within 10 seconds, and the test operation starts. Monitor the operation of the indoor unit for a minimum of 10 minutes. During test operation, the indoor unit will continue to cool/heat regardless of the temperature setpoint and room temperature.
Page 256: Field Settings
Field Settings SiUS122226E 5. Field Settings Wall Mounted/Floor Standing Type 5.1.1 Model Type Settings ARC452A21  The remote controller is common to the heat pump model and cooling only model.  Make sure the DIP switch is set to the left side. The heating operation will not be available when the DIP switch is set to the right side.
Page 257 SiUS122226E Field Settings 5.1.2 Temperature Display Switch You can select Fahrenheit or Celsius for temperature display. ARC452A21  Press TEMPand TEMPbuttons at the same time for 5 seconds to change the unit of temperature display. (R14477) ARC466A21, ARC466A36  Press the upper side of Temp button and On button at the same time for 5 seconds to change the unit of temperature display.
Page 258 Field Settings SiUS122226E 5.1.3 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. CTXS, FTXS, 1.
Page 259 SiUS122226E Field Settings FVXS Series 1. Remove the front grille. 2. Lift the sensor PCB fixing plate and remove the front shield plate. 3. Disconnect the connectors S1, S41, S42. 4. Remove the electric box (1 screw). 5. Pull out the indoor heat exchanger thermistor. 6.
Page 260 Field Settings SiUS122226E Wireless Remote 1. Remove the cover and take it off. 2. Cut the address setting jumper. Controller ARC452 series ARC466 series Jumper Jumper (J4) ADDRESS ADDRESS EXIST EXIST (R12065) ∗ Do not cut the left jumper. (R18416) Caution Replace the remote controller if you cut a jumper unintentionally.
Page 261 SiUS122226E Field Settings 5.1.4 Jumper and Switch Settings CTXS, FTXS, FVXS series Jumper When connected on indoor Function When cut (factory setting) unit PCB Fan speed setting when Fan speed setting; The fan stops. compressor stops for Remote controller setting thermostat OFF.
Page 262: Duct Concealed/Ceiling Cassette Type
Field Settings SiUS122226E Duct Concealed/Ceiling Cassette Type 5.2.1 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. Note When using 2 remote controllers for 1 indoor unit, change the field settings from MAIN remote controller.
Page 263 SiUS122226E Field Settings 3. Highlight the mode, and select desired “Mode No.” by using (Up/Down) button. 4. In the case of setting per indoor unit during group control (When Mode No. such as 20 22 23 25 are selected), highlight the unit No. and select “Indoor unit No.” to be set by using (Up/Down) button.
Page 264 Field Settings SiUS122226E BRC082A43, BRC082A41W, BRC082A42W(S) Wireless Remote Controller UP button Mode No. Field setting mode DOWN button First code No. RESERVE button MODE button Second code No. INSPECTION/TEST button (R24061) To set the field settings, you have to change: ...
Page 265 SiUS122226E Field Settings 5.2.2 Overview of Field Settings for FFQ Series First Second Code No. Mode Code Description of setting Filter cleaning Longlife filter Approx. Approx. sign interval — — — — 2,500 hrs. 1,250 hrs. (20) Remote controller thermistor Enabled Disabled...
Page 266 Field Settings SiUS122226E 5.2.3 Overview of Field Settings for CDMQ, FDMQ Series First Second Code No. Mode Code Description of setting Filter cleaning Longlife Approx. Approx. sign interval filter 2,500 1,250 — — — — (used to change hrs. hrs. filter cleaning Standard Approx.
Page 267 SiUS122226E Field Settings 5.2.4 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, set one to MAIN and the other to SUB. Details 1.
Page 268 Field Settings SiUS122226E 5.2.5 MAIN/SUB and Address Setting for Wireless Remote Controller for FDMQ Series Outline  If setting multiple wireless remote controllers to operate in one room, perform address setting for the receiver and the wireless remote controller.  If using both a wired remote controller and a wireless remote controller with 1 indoor unit, change the MAIN/SUB switch of the signal receiver PCB.
Page 269 SiUS122226E Field Settings Wireless Remote Factory set is 1. Change the wireless remote controller address setting by the following steps, if necessary. Controller 1. Hold down button and /TEST button at the same time for at least 4 seconds to enter the Address field setting mode.
Page 270 Field Settings SiUS122226E Multiple Settings When the indoor unit is controlled by an outside controller (central remote controller, etc.), the indoor unit sometimes does not respond to ON/OFF command or temperature setting command A or b from the wireless remote controller. Check what setting the customer needs and make the multiple setting as shown below.
Page 271 SiUS122226E Field Settings 5.2.6 MAIN/SUB and Address Setting for Wireless Remote Controller for FFQ Series Outline  If setting multiple wireless remote controllers to operate in one room, perform address setting for the receiver and the wireless remote controller.  If using both a wired remote controller and a wireless remote controller with 1 indoor unit, change the MAIN/SUB switch of the transmitter board.
Page 272 Field Settings SiUS122226E Wireless Remote Factory set is 1. Change the wireless remote controller address setting by the following steps, if necessary. Controller 1. Hold down button and /TEST button at the same time for at least 4 seconds to enter the Address field setting mode.
Page 273 SiUS122226E Field Settings Multiple Settings When the indoor unit is controlled by an outside controller (central remote controller, etc.), the indoor unit sometimes does not respond to ON/OFF command or temperature setting command A or b from the wireless remote controller. Check what setting the customer needs and make the multiple setting as shown below.
Page 274: Outdoor Unit
Field Settings SiUS122226E Outdoor Unit 5.3.1 Priority Room Setting Outline The indoor unit for which priority room setting is applied takes priority in the following cases.  Operation mode priority The operation mode of the prioritized room takes precedence. For example, when the prioritized indoor unit starts cooling operation, the other indoor units which have been in heating operation enter the standby mode.
Page 275 SiUS122226E Field Settings 5.3.2 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 the pins 1 and 3 of the connector S15. Setting to cooling only (C): short-circuit the pins 3 and 5 of the connector S15. The following specifications apply to the connector housing and pins.
Page 276 Field Settings SiUS122226E  5MXS, 4MXL(H) Top panel Right side panel Hooks Front panel Shield plate S15 connector COOL mode (C) HEAT mode (H) R7000163 Note(s) Forced operation is also possible in cooling/heating mode Part 7 Trial Operation and Field Settings...
Page 277 SiUS122226E Field Settings 5.3.3 NIGHT QUIET Mode Outline 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.
Page 278 Field Settings SiUS122226E 5.3.4 Warmer Airflow Setting Outline The temperature of discharge airflow in heating operation can be adjusted warmer.  The room temperature will be high when getting close to the set temperature.  The discharge airflow does not become warmer in other than heating operation. Procedure Warmer airflow can be enabled/disabled from outdoor unit for this system.
Page 279 SiUS122226E Field Settings 5.3.5 Drain Pan Heater Applicable 2MXS18WMVJU9, 3MXS24WMVJU9, 4MXS36WMVJU9, 5MXS48WVJU9 Models 2MXL18WMVJU9, 3MXL24WMVJU9, 4MXL36WVJU9 Outline In high humidity areas or heavy snow areas, it is recommended to attach a drain pan heater to prevent ice build-up from the bottom frame. Field setting is necessary when attaching the optional drain pan heater.
Page 280: Silicone Grease On Power Transistor/Diode Bridge
Silicone Grease on Power Transistor/Diode Bridge SiUS122226E 6. Silicone Grease on Power Transistor/Diode Bridge Outline Apply the specified silicone grease to the heat generation part of a power transistor/diode bridge when you replace an outdoor unit PCB. The silicone grease encourages the heat dissipation of a power transistor/diode bridge.
Page 281: Part 8 Appendix
SiUS122226E Part 8 Appendix 1. Piping Diagrams..................276 1.1 Indoor Unit....................276 1.2 Outdoor Unit ..................... 279 2. Wiring Diagrams..................282 2.1 Indoor Unit....................282 2.2 Outdoor Unit ..................... 288 3. Operation Limit..................296 Part 8 Appendix...
Page 282: Piping Diagrams
Piping Diagrams SiUS122226E 1. Piping Diagrams Indoor Unit CTXS07WVJU9, FTXS09/12WVJU9 FTXS15/18WVJU9 4D074609A 4D074606A FTXS24WVJU9 4D074608A Part 8 Appendix...
Page 283 SiUS122226E Piping Diagrams FTXR09/12WVJUW(S)9 FTXR18WVJUW(S)9 Indoor unit Indoor unit Heat exchanger thermistor 1/4 CuT Heat exchanger thermistor Heat exchanger 1/4 CuT Heat exchanger Cross flow fan Field piping Cross flow fan Field piping 1/4 CuT 1/4 CuT Fan motor Field piping Fan motor Field piping 1/2 CuT...
Page 284 Piping Diagrams SiUS122226E CDMQ07WVJU9, FDMQ09/12/15/18/24WVJU9 FFQ09/12/15/18W2VJU9 REFRIGERANT FLOW COOLING HEATING HEAT EXCHANGER LIQUID PIPE CONNECTION PORT GAS PIPE CONNECTION PORT MODEL FDMQ09 • 1/4 (6.4) 3/8 (9.5) CDMQ07 MODEL 1/4 (6.4) 1/2 (12.7) FDMQ15 • FFQ09W2VJU9 1/4 (6.4) 3/8 (9.5) FFQ12W2VJU9 FDMQ24 1/4 (6.4)
Page 285: Outdoor Unit
SiUS122226E Piping Diagrams Outdoor Unit 2MXS18WMVJU9 3D140919 3MXS24WMVJU9, 3MXL24WMVJU9, 3MXLH24WVJU9 3D140915 Part 8 Appendix...
Page 286 Piping Diagrams SiUS122226E 4MXS36WMVJU9 3D140918 5MXS48WVJU9 3D140985 Part 8 Appendix...
Page 287 SiUS122226E Piping Diagrams 2MXL18WMVJU9, 2MXLH18WVJU9 3D140914 4MXL36WVJU9, 4MXLH36WVJU9 3D140984 Part 8 Appendix...
Page 288: Wiring Diagrams
Wiring Diagrams SiUS122226E 2. Wiring Diagrams Indoor Unit CTXS07WVJU9, FTXS09/12WVJU9 3D058246M Note PCB1: Control PCB PCB2: Signal receiver PCB PCB3: Display PCB PCB4: INTELLIGENT EYE sensor PCB Refer to page 30 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 289 SiUS122226E Wiring Diagrams FTXS15/18/24WVJU9 C: 3D060942X Note PCB1: Control PCB PCB2: Signal receiver PCB PCB3: Display PCB PCB4: INTELLIGENT EYE sensor PCB Refer to page 30 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 290 Wiring Diagrams SiUS122226E FTXR09/12/18WVJUW(S)9 3D103375B Note A1P: Control PCB A2P: Display/signal receiver PCB A3P: INTELLIGENT EYE sensor PCB Refer to page 33 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 291 SiUS122226E Wiring Diagrams FVXS09/12/15/18WVJU9 3D090604B Note PCB1: Sensor PCB PCB2: Control PCB PCB3: Service PCB PCB4: Display/signal receiver PCB Refer to page 35 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 292 Wiring Diagrams SiUS122226E CDMQ07WVJU9, FDMQ09/12/15/18/24WVJU9 3D112629B Note A1P: Control PCB A2P: Indoor fan PCB Refer to page 37 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 293 SiUS122226E Wiring Diagrams FFQ09/12/15/18W2VJU9 3D139759B Note A1P: Control PCB A2P: Transmitter board for wireless remote controller A3P: Receiver for wireless remote controller A4P: Thermopile sensor A5P: Pyroelectric sensor Refer to page 39 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 294: Outdoor Unit
Wiring Diagrams SiUS122226E Outdoor Unit 2MXS18WMVJU9, 2MXL18WMVJU9 3D139561 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 44 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 295 SiUS122226E Wiring Diagrams 3MXS24WMVJU9, 3MXL24WMVJU9 3D139599 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 44 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 296 Wiring Diagrams SiUS122226E 4MXS36WMVJU9 3D139601 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 44 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 297 SiUS122226E Wiring Diagrams 5MXS48WVJU9 3D139636 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 47 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 298 Wiring Diagrams SiUS122226E 4MXL36WVJU9 3D139623 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 47 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 299 SiUS122226E Wiring Diagrams 2MXLH18WVJU9 3D139560 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 44 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 300 Wiring Diagrams SiUS122226E 3MXLH24WVJU9 3D139564 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 44 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 301 SiUS122226E Wiring Diagrams 4MXLH36WVJU9 3D139621 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 47 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
Page 302: Operation Limit
Operation Limit SiUS122226E 3. Operation Limit 2MXS18WMVJU9, 3MXS24WMVJU9, 4MXS36WMVJU9, 5MXS48WVJU9 3D048149D 2MXL18WMVJU9, 3MXL24WMVJU9, 4MXL36WVJU9, 2MXLH18WVJU9, 3MXLH24WVJU9, 4MXLH36WVJU9 3D101428B Part 8 Appendix...
Page 303 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion.  Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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