Daikin CTXS07LVJU Service Manual
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Daikin CTXS07LVJU Service Manual

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SiUS121602E
Service
Manual
Multi-Split Type Air Conditioners
2/3MXL-Q Series
[Applied Models]
Inverter Multi : Heat Pump

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Summary of Contents for Daikin CTXS07LVJU

  • Page 1 SiUS121602E Service Manual Multi-Split Type Air Conditioners 2/3MXL-Q Series [Applied Models] Inverter Multi : Heat Pump...
  • Page 2 SiUS121602E Multi-Split Type Air Conditioners 2/3MXL-Q Series Heat Pump Indoor Unit CTXS07LVJU FDXS09LVJU FVXS09NVJU FFQ09LVJU FTXS09LVJU FDXS12LVJU FVXS12NVJU FFQ12LVJU FTXS12LVJU CDXS15LVJU FVXS15NVJU FFQ15LVJU FTXS15LVJU CDXS18LVJU FVXS18NVJU FFQ18LVJU FTXS18LVJU Outdoor Unit 2MXL18QMVJU 3MXL24QMVJU Table of Contents...

  • Page 3: Table Of Contents

    1. Indoor Unit....................8 2. Outdoor Unit....................13 Part 3 Printed Circuit Board Connector Wiring Diagram ....15 1. Indoor Unit....................16 1.1 CTXS07LVJU, FTXS09/12LVJU ..............16 1.2 FTXS15/18LVJU ..................18 1.3 FDXS09/12LVJU, CDXS15/18LVJU ............20 1.4 FVXS09/12/15/18NVJU................22 1.5 FFQ09/12/15/18LVJU ................24 2.
  • Page 4 SiUS121602E 2.3 Freeze Prevention Control ................. 56 2.4 Hot Start Control (In Heating Operation Only)..........57 3. Control Specification .................58 3.1 Thermistor Functions.................. 58 3.2 Mode Hierarchy ..................60 3.3 Frequency Control..................61 3.4 Controls at Mode Changing/Start-up............63 3.5 Discharge Pipe Temperature Control............64 3.6 Input Current Control..................
  • Page 5 SiUS121602E 6. Troubleshooting for FFQ Series..............125 6.1 Indoor Unit PCB Abnormality ..............125 6.2 Drain Level Control System Abnormality..........126 6.3 Fan Motor (AC Motor) or Related Abnormality......... 127 6.4 Drain System Abnormality................ 128 6.5 Thermistor or Related Abnormality............129 6.6 Remote Controller Thermistor Abnormality ..........
  • Page 6 SiUS121602E 8.15 Power Module Check ................174 Part 7 Trial Operation and Field Settings........175 1. Pump Down Operation................176 2. Wiring Error Check Function ..............177 3. Trial Operation ..................179 3.1 CTXS, FTXS, CDXS, FDXS, FVXS Series ..........179 3.2 FFQ Series ....................181 4.

  • Page 7: Safety Cautions

    SiUS121602E Safety Cautions 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. Caution Items The caution items are classified into Warning and...
  • Page 8 Safety Cautions SiUS121602E Warning Do not turn the air conditioner on or off by plugging in or unplugging the power cable. Plugging in or unplugging the power cable to operate the equipment may cause an electrical shock or fire. Be sure to wear a safety helmet, gloves, and a safety belt when working in a high place (more than 2 m).

  • Page 9: Warnings And Cautions Regarding Safety Of Users

    SiUS121602E Safety Cautions Caution Conduct welding work in a well-ventilated place. Using a welder in an enclosed room may cause oxygen deficiency. Warnings and Cautions Regarding Safety of Users Warning Do not store the equipment in a room with fire sources (e.g., naked flames, gas appliances, electric heaters).
  • Page 10 Safety Cautions SiUS121602E 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 11 SiUS121602E Safety Cautions Caution Check the earth / grounding, and repair it if the equipment is not properly earthed / grounded. Improper earth / grounding may cause an electrical shock. Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 MΩ...

  • Page 12: Icons Used

    Icons Used SiUS121602E 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning A Warning is used when there is danger of personal injury. Warning Caution A Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, lose data, get an Caution...

  • Page 13: Part 1 List Of Functions

    SiUS121602E Part 1 List of Functions 1. Functions..................... 2 List of Functions...

  • Page 14: Functions

    Functions SiUS121602E 1. Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — — Functions Cleanliness Operation limit for cooling (°CDB) — — Photocatalytic deodorizing filter — — Operation limit for cooling (°FDB) — —...
  • Page 15 SiUS121602E Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — — Functions Cleanliness Operation limit for cooling (°CDB) — — Photocatalytic deodorizing filter — — Operation limit for cooling (°FDB) — — Air-purifying filter with photocatalytic —...
  • Page 16 Functions SiUS121602E Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — Functions Cleanliness Operation limit for cooling (°CDB) — Photocatalytic deodorizing filter — Operation limit for cooling (°FDB) — Air-purifying filter with photocatalytic — deodorizing function Operation limit for heating (°CWB) —...
  • Page 17 SiUS121602E Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — Functions Cleanliness Operation limit for cooling (°CDB) — Photocatalytic deodorizing filter — Operation limit for cooling (°FDB) — Air-purifying filter with photocatalytic — deodorizing function Operation limit for heating (°CWB) —...
  • Page 18 Functions SiUS121602E Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — — Functions Cleanliness –10 –10 Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — — ~ 46 ~ 46 14 ~ 14 ~ Air-purifying filter with photocatalytic Operation limit for cooling (°FDB) —...

  • Page 19: Part 2 Specifications

    SiUS121602E Part 2 Specifications 1. Indoor Unit....................8 2. Outdoor Unit....................13 Specifications...

  • Page 20: Indoor Unit

    Indoor Unit SiUS121602E 1. Indoor Unit 60 Hz, 208 - 230 V CTXS07LVJU Model Cooling Heating Rated Capacity 7 kBtu/h Class Front Panel Color White 332 (9.4) 350 (9.9) 261 (7.4) 290 (8.2) Airflow Rate (m³/min) 194 (5.5) 233 (6.6) 145 (4.1)
  • Page 21 SiUS121602E Indoor Unit 60 Hz, 208 - 230 V FTXS15LVJU FTXS18LVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class Front Panel Color White White 568 (16.1) 593 (16.8) 583 (16.5) 625 (17.7) 477 (13.5) 505 (14.3) 484 (13.7) 526 (14.9) Airflow Rate...
  • Page 22 Indoor Unit SiUS121602E 60 Hz, 208 - 230 V CDXS15LVJU CDXS18LVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class External Static Pressure inAq (Pa) 0.16 (40) 0.16 (40) 424 (12.0) 424 (12.0) 424 (12.0) 424 (12.0) 388 (11.0) 388 (11.0) 388 (11.0)
  • Page 23 SiUS121602E Indoor Unit 60 Hz, 208 - 230 V FVXS15NVJU FVXS18NVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class Front Panel Color White White 378 (10.7) 417 (11.8) 378 (10.7) 417 (11.8) 325 (9.2) 357 (10.1) 325 (9.2) 357 (10.1) Airflow Rate...
  • Page 24 Indoor Unit SiUS121602E 60 Hz, 208 - 230 V FFQ15LVJU FFQ18LVJU Model Cooling Heating Cooling Heating Rated Capacity 15 kBtu/h Class 18 kBtu/h Class Model BYFQ60B3W1 BYFQ60B3W1 Color White White Decoration Panel Dimensions (H × W × D) 2-5/32 × 27-9/16 × 27-9/16 (55 × 700 × 700) 2-5/32 ×...

  • Page 25: Outdoor Unit

    SiUS121602E Outdoor Unit 2. Outdoor Unit 60 Hz, 208 - 230 V 2MXL18QMVJU Model Cooling Heating — 4.20 Btu/h·W 12.7 — SEER / HSPF 17.0 10.3 Casing Color Ivory White Type Hermetically Sealed Swing Type Compressor Model 2YC63AAXD Motor Output 1,920 Model FVC50K...
  • Page 26 Outdoor Unit SiUS121602E 60 Hz, 208 - 230 V 3MXL24QMVJU Model Cooling Heating — 4.56 Btu/h·W 12.7 — SEER / HSPF 17.9 12.5 Casing Color Ivory White Type Hermetically Sealed Swing Type Compressor Model 2YC63AAXD Motor Output 1,920 Model FVC50K Refrigerant Oil Charge oz (L)

  • Page 27: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiUS121602E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................16 1.1 CTXS07LVJU, FTXS09/12LVJU ..............16 1.2 FTXS15/18LVJU ..................18 1.3 FDXS09/12LVJU, CDXS15/18LVJU ............20 1.4 FVXS09/12/15/18NVJU................22 1.5 FFQ09/12/15/18LVJU ................24 2. Wired Remote Controller................25 2.1 BRC1E71 ....................25 2.2 BRC1E72/73 ....................

  • Page 28: Indoor Unit

    Indoor Unit SiUS121602E 1. Indoor Unit CTXS07LVJU, FTXS09/12LVJU Control PCB (PCB1) 1) S1 Connector for DC fan motor 2) S21 Connector for centralized control (HA) 3) S25 Connector for INTELLIGENT EYE sensor PCB 4) S32 Indoor heat exchanger thermistor 5) S41...
  • Page 29 SiUS121602E Indoor Unit Signal Receiver PCB (PCB2) 1) S48 Connector for control PCB 3P210728-1 Display PCB (PCB3) 1) S49 Connector for control PCB 2) SW1 Forced cooling operation ON/OFF button 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P) LED for INTELLIGENT EYE (green)

  • Page 30: Ftxs15/18Lvju

    Indoor Unit SiUS121602E FTXS15/18LVJU Control PCB (PCB1) 1) S1 Connector for DC fan motor 2) S21 Connector for centralized control (HA) 3) S25 Connector for INTELLIGENT EYE sensor PCB 4) S32 Indoor heat exchanger thermistor 5) S41 Connector for swing motors 6) S46 Connector for display PCB 7) S47...
  • Page 31 SiUS121602E Indoor Unit Signal Receiver PCB (PCB2) 1) S48 Connector for control PCB 3P224121-1 Display PCB (PCB3) 1) S49 Connector for control PCB 2) SW1 Forced cooling operation ON/OFF button 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P) LED for INTELLIGENT EYE (green)

  • Page 32: Fdxs09/12Lvju, Cdxs15/18Lvju

    Indoor Unit SiUS121602E FDXS09/12LVJU, CDXS15/18LVJU Control PCB (A1P) 1) S1 Connector for AC fan motor 2) S7 Connector for AC fan motor (Hall IC) 3) S21 Connector for centralized control (HA) 4) S26 Connector for display PCB 5) S32 Connector for indoor heat exchanger thermistor 6) H1, H2, H3 Connector for terminal board 7) FG (GND)
  • Page 33 SiUS121602E Indoor Unit Display PCB (A2P) 1) S1 Connector for control PCB 2) SW1 (S1W) Forced cooling operation ON/OFF button 3) LED2 (H2P) LED for timer (yellow) 4) LED3 (H3P) LED for operation (green) 5) RTH1 (R1T) Room temperature thermistor LED3 LED2 RTH1...

  • Page 34: Fvxs09/12/15/18Nvju

    Indoor Unit SiUS121602E FVXS09/12/15/18NVJU Control PCB (PCB2) 1) S1 Connector for fan motor 2) S21 Connector for centralized control (HA) 3) S26 Connector for service PCB 4) S32 Indoor heat exchanger thermistor 5) S41 Connector for lower air outlet motor 6) S42 Connector for swing motor 7) S46...
  • Page 35 SiUS121602E Indoor Unit Sensor PCB (PCB1) 1) S49 Connector for control PCB 2) RTH2 (R1T) Room temperature thermistor RTH2 3P191450-1 Service PCB (PCB3) 1) S27 Connector for control PCB 2) SW2 (S2W)-4 Switch for upward airflow limit setting ∗ Refer to page 189 for detail. ∗...

  • Page 36: Ffq09/12/15/18Lvju

    Indoor Unit SiUS121602E FFQ09/12/15/18LVJU Control PCB 1) X5A Connector for terminal board (for wired remote controller) 2) X10A, X11A Connector for transformer 3) X15A Connector for float switch 4) X17A, X18A Connector for indoor heat exchanger thermistor 5) X19A Connector for room temperature thermistor 6) X20A Connector for fan motor 7) X24A...

  • Page 37: Wired Remote Controller

    SiUS121602E Wired Remote Controller 2. Wired Remote Controller BRC1E71 Wired Remote 1) P1, P2 Terminal for indoor unit Controller PCB 2) R1T Room temperature thermistor 2P243326-3 Printed Circuit Board Connector Wiring Diagram...

  • Page 38: Brc1E72/73

    Wired Remote Controller SiUS121602E BRC1E72/73 Wired Remote 1) P1, P2 Terminal for indoor unit Controller PCB 2) R1T Room temperature thermistor 2P298037-3 2P298037-7 Printed Circuit Board Connector Wiring Diagram...

  • Page 39: Wireless Remote Controller

    SiUS121602E Wireless Remote Controller 3. Wireless Remote Controller BRC7E830 Signal Receiver 1) X1A Connector for display PCB 2) X2A Connector for control PCB 3) SS1 MAIN/SUB setting switch ∗ Refer to page 194 for detail. 4) SS2 Address setting switch ∗...

  • Page 40: Outdoor Unit

    Outdoor Unit SiUS121602E 4. Outdoor Unit Main PCB (PCB1) 1) S Connector for terminal board (indoor - outdoor transmission) 2) S15 Connector for COOL/HEAT mode lock ∗ Refer to page 184 for detail. 3) S20 (white) Connector for electronic expansion valve coil A port 4) S21 (red) Connector for electronic expansion valve coil B port 5) S22 (blue)
  • Page 41 SiUS121602E Outdoor Unit E1, E2 HL1, HN1 V401 S201 U, V, W S202 2P350358-12 Printed Circuit Board Connector Wiring Diagram...
  • Page 42 Outdoor Unit SiUS121602E Service Monitor PCB (PCB2) 1) S501, S502 Connector for main PCB 2) LED A LED for service monitor (green) 3) LED1 - LED5 LED for service monitor (red) 4) SW1 Forced cooling operation ON/OFF switch ∗ Refer to page 176 for detail. 5) SW2 Operation mode switch ∗...

  • Page 43: Part 4 Functions And Control

    SiUS121602E Part 4 Functions and Control 1. Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series ......32 1.1 Temperature Control .................. 32 1.2 Frequency Principle..................32 1.3 Airflow Direction Control (CTXS, FTXS, FVXS Series) ......34 1.4 Fan Speed Control for Indoor Unit ............. 37 1.5 Program Dry Operation ................

  • Page 44: Functions For Ctxs, Ftxs, Cdxs, Fdxs, Fvxs Series

    Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E 1. Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer...
  • Page 45 SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series Inverter Principle To regulate the capacity, a frequency control is needed. The inverter makes it possible to control the rotation speed of the compressor. The following table explains the inverter principle: Phase Description The supplied AC power source is converted into the DC power source for the present.

  • Page 46: Airflow Direction Control (Ctxs, Ftxs, Fvxs Series)

    Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Frequency Limits The following functions regulate the minimum and maximum frequency: Frequency Functions Four way valve operation compensation. Refer to page 63. High Compressor protection function. Refer to page 64. Discharge pipe temperature control. Refer to page 64. Input current control.
  • Page 47 SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series FVXS Series Flap (up and down) Cooling / Dry Heating Upward airflow limit (R6831) (R6829) Upward airflow limit (R6832) (R6830) 3-D Airflow CTXS, FTXS Series Alternative repetition of vertical and horizontal swing motions enables uniform air-conditioning of the entire room.
  • Page 48 Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E 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 depending on mode and conditions.

  • Page 49: Fan Speed Control For Indoor Unit

    SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series 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 50: Program Dry Operation

    Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E 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. Detail The microcomputer automatically sets the temperature and airflow rate.

  • Page 51: Automatic Operation

    SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series Automatic Operation Outline Automatic Cooling/Heating Function When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up.

  • Page 52: Thermostat Control

    Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Detail Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON Condition The temperature difference returns to the zone C after being in the zone A.

  • Page 53: Night Set Mode

    SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series NIGHT SET Mode Outline When the OFF TIMER is set, NIGHT SET Mode is automatically activated. NIGHT SET Mode keeps the airflow rate setting. Detail NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in cooling, or lowers it slightly in heating.

  • Page 54: Intelligent Eye Operation (Ctxs, Ftxs Series)

    Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E 1.10 INTELLIGENT EYE Operation (CTXS, FTXS Series) Outline This function 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. Detail 1.

  • Page 55: Inverter Powerful Operation

    SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series 1.11 Inverter 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. Detail When POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.

  • Page 56: Clock Setting

    Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E 1.12 Clock Setting ARC452 Series The clock can be set by taking the following steps: 1. Press CLOCK button. ARC466 Series → is displayed and MON and blink. 2. Press SELECT or SELECT button to set the clock to the current day of the week.

  • Page 57: Weekly Timer Operation (Ctxs, Ftxs, Fvxs Series)

    SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series 1.13 WEEKLY TIMER Operation (CTXS, FTXS, FVXS Series) 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. Detail The illustrations are for FVXS series as representative.
  • Page 58 Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E 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 59: Function And Control

    SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10-minute intervals. • To return to the ON/OFF TIMER mode setting, press • Proceed to STEP when setting the OFF TIMER.
  • Page 60 Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Copy mode • A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied. program 1 program 2 program 3 program 4 [Monday]...
  • Page 61 SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series Confirming a reservation • The reservation can be confirmed. Setting Displays Normal Confirmation Press • The day of the week and the reservation number of the current day will be displayed. Press to select the day of the week and the reservation number to be confirmed.
  • Page 62 Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E To delete reservations An 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 63: Other Functions

    SiUS121602E Functions for CTXS, FTXS, CDXS, FDXS, FVXS Series 1.14 Other Functions 1.14.1 Hot-Start Function In order to prevent the cold air blast that normally occurs when heating operation starts, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or significantly weakened resulting in comfortable heating.

  • Page 64: Functions For Ffq Series

    Functions for FFQ Series SiUS121602E 2. Functions for FFQ Series Drain Pump Control 2.1.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min. (R21088) The float switch is OFF in normal operation. When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. After the thermostat turns OFF, the drain pump continues to operate for another 5 minutes.
  • Page 65 SiUS121602E Functions for FFQ Series 2.1.3 If the Float Switch is ON with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. (R21090) When the float switch turns ON, the drain pump turns ON simultaneously. If the float switch remains ON even after the residual operation of the drain pump has ended, the error code A3 is displayed on the remote controller.

  • Page 66: Thermostat Sensor In Remote Controller

    Functions for FFQ Series SiUS121602E Thermostat Sensor in Remote Controller Outline Temperature is controlled by both the thermostat sensor in remote controller and air suction thermostat in the indoor unit. (This is however limited to when the field setting for the thermostat sensor in remote controller is set to Use.) Cooling If there is a significant difference in the set temperature and the suction temperature, fine...
  • Page 67 SiUS121602E Functions for FFQ Series Heating When heating, the hot air rises to the top of the room, resulting in the temperature being lower near the floor where the occupants are. When controlling by body thermostat sensor only, the indoor unit may therefore be turned off by the thermostat before the lower part of the room reaches the set temperature.

  • Page 68: Freeze Prevention Control

    Functions for FFQ Series SiUS121602E Freeze Prevention Control Outline When the temperature detected by liquid pipe thermistor (R2T) of the indoor heat exchanger drops too low, the unit enters freeze prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below.

  • Page 69: Hot Start Control (In Heating Operation Only)

    SiUS121602E Functions for FFQ Series 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. Detail Defrost ending or oil return ending Hot start ending conditions...

  • Page 70: Control Specification

    Control Specification SiUS121602E 3. Control Specification Thermistor Functions Outdoor electronic expansion valve Four way valve Compressor (R17359) The illustration is for the 3-room models as representative and have 3 lines of indoor unit system (A ~ C). The 2-room models have 2 lines (A ~ B). (1) Outdoor Heat 1.
  • Page 71 SiUS121602E Control Specification (4) Indoor Heat 1. The indoor heat exchanger thermistor is used for controlling the target discharge pipe temperature. The system sets the target discharge pipe temperature according to the outdoor Exchanger and indoor heat exchanger temperature, and controls the electronic expansion valve opening so Thermistor that the target discharge pipe temperature can be obtained.

  • Page 72: Mode Hierarchy

    Control Specification SiUS121602E Mode Hierarchy Outline Air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing. Detail Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Forced heating operation Wiring error check operation Power transistor test mode...

  • Page 73: Frequency Control

    SiUS121602E Control Specification Frequency Control Outline Frequency that corresponds to each room’s capacity is determined according to the difference between the target temperature and the temperature of each room. When the shift of the frequency is less than zero (∆F<0) by PI control, the target frequency is used as the command frequency.
  • Page 74 Control Specification SiUS121602E Parameters Q value Indoor unit output determined from indoor unit volume, airflow rate and other factors. S value: Indoor Unit Capacity An S value is the capacity of the indoor unit, and is used for frequency command. Capacity S value Capacity...

  • Page 75: Controls At Mode Changing/Start-Up

    SiUS121602E Control Specification Controls at Mode Changing/Start-up 3.4.1 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. Detail ON Condition When the outdoor temperature is below 6°C (42.8°F), the inverter operation in open phase starts.

  • Page 76: Discharge Pipe Temperature Control

    Control Specification SiUS121602E 3.4.5 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.) (Hz) Frequency (sec.) Time (R13528) All outdoor units A (Hz) B (Hz) C (Hz) D (seconds)

  • Page 77: Input Current Control

    SiUS121602E 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 frequency and takes priority over the lower limit control of four way valve operation compensation.

  • Page 78: Freeze-Up Protection Control

    Control Specification SiUS121602E Freeze-up Protection Control Outline During cooling operation, the signals sent from the indoor units control the operating frequency limitation and prevent freezing of the indoor heat exchanger. (The signals from the indoor units are divided into zones.) Detail The operating frequency limitation is judged with the indoor heat exchanger temperature 2 seconds after operation starts and 30 seconds after the number of operation room is changed.

  • Page 79: Outdoor Fan Control

    SiUS121602E Control Specification Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control during defrosting The outdoor fan is turned OFF while defrosting.

  • Page 80: Defrost Control

    Control Specification SiUS121602E 3.11 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting. Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.

  • Page 81: Low Hz High Pressure Limit

    SiUS121602E Control Specification All outdoor units A (minutes) B (°C) 4 ~ 12 C (°F) 39.2 ~ 53.6 D (Hz) E (Hz) F (seconds) G (seconds) H (seconds) J (seconds) K (pulse) L (pulse) M (pulse) N (pulse) P (pulse) Q (pulse) 3.12 Low Hz High Pressure Limit Outline...

  • Page 82: Electronic Expansion Valve Control

    Control Specification SiUS121602E 3.13 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 83 SiUS121602E Control Specification Detail The followings are the examples of electronic expansion valve control which function in each operation mode. Operation pattern : Available — : Not available When power is turned on Fully closed when power is turned on —...

  • Page 84: Pressure Equalizing Control

    Control Specification SiUS121602E 3.13.1 Fully Closing with Power On The electronic expansion valve is initialized when the power is turned on. The opening position is set and the pressure is equalized. 3.13.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens and the pressure is equalized.
  • Page 85 SiUS121602E Control Specification 3.13.8 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 86 Control Specification SiUS121602E 3.13.10 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 is > target SC, open the electronic expansion valve of the room. When the actual SC is <...

  • Page 87: Malfunctions

    SiUS121602E Control Specification 3.14 Malfunctions 3.14.1 Sensor Malfunction Detection Sensor malfunction may occur either in the thermistor or current transformer (CT) system. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Gas pipe thermistor 5.

  • Page 88: Part 5 Remote Controller

    SiUS121602E Part 5 Remote Controller 1. CTXS, FTXS Series ..................77 2. CDXS, FDXS Series .................79 3. FVXS Series....................81 4. FFQ Series....................83 4.1 <BRC1E71> Wired Remote Controller............83 4.2 <BRC1E72/73> Wired Remote Controller..........88 4.3 <BRC7E830> Wireless Remote Controller ..........94 Remote Controller...

  • Page 89: Ctxs, Ftxs Series

    1 Inverter POWERFUL operation P.43 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/) Remote Controller...
  • Page 90 7 Clock setting P.44 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/) Remote Controller...

  • Page 91: Cdxs, Fdxs Series

    1 Inverter POWERFUL operation P.43 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/) Remote Controller...
  • Page 92 3 Clock setting P.44 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/) Remote Controller...

  • Page 93: Fvxs Series

    1 Inverter POWERFUL operation P.43 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/) Remote Controller...
  • Page 94 5 Clock setting P.44 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/) Remote Controller...

  • Page 95: Ffq Series

    SiUS121602E FFQ Series 4. FFQ Series <BRC1E71> Wired Remote Controller 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10.
  • Page 96 FFQ Series SiUS121602E 1. Operation mode selector button 7. Left button Press this button to select the operation Used to highlight the next items on the mode of your preference. left-hand side. * Available modes vary with the indoor unit Each screen is scrolled in the left-hand model.
  • Page 97 SiUS121602E FFQ Series Liquid Crystal Display Two types of liquid crystal display (LCD) are available. The standard display is set by default. Detailed display can be selected in the main menu. The displayed contents of the screen vary with the operation mode of the indoor unit model. (The following display will appear when the indoor unit is in automatic operation.) Standard display 10.
  • Page 98 FFQ Series SiUS121602E “Error: Push Menu button” 1. Operation mode “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. “Time to clean filter” 2.
  • Page 99 SiUS121602E FFQ Series 11. Setback “ ” The setback icon flashes when the unit is turned on under the setback control. 12. Air Flow Direction “ ” Displayed when the air flow direction and swing are set. If the connected indoor unit model does not include oscillating louvers this item will not be displayed.

  • Page 100: Brc1E72/73> Wired Remote Controller

    FFQ Series SiUS121602E <BRC1E72/73> Wired Remote Controller 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button 2.

  • Page 101: Operation Lamp

    SiUS121602E FFQ Series 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 •...
  • Page 102 FFQ Series SiUS121602E 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 103 SiUS121602E FFQ Series 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 104 FFQ Series SiUS121602E 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 105: Airflow Direction

    SiUS121602E FFQ Series 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 include oscillating louvers this item will not be displayed.

  • Page 106: Brc7E830> Wireless Remote Controller

    FFQ Series SiUS121602E <BRC7E830> Wireless Remote Controller (R18863) (R17873) PROGRAMMING TIMER BUTTON DISPLAY (SIGNAL TRANSMISSION) Use this button for programming start and/or This lights up when a signal is being stop time. (Operates with the front cover of transmitted. the remote controller opened.) DISPLAY 12 TIMER MODE START/STOP BUTTON (OPERATION MODE)

  • Page 107: Part 6 Service Diagnosis

    SiUS121602E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items .........97 2. Troubleshooting with LED .................98 2.1 Indoor Unit....................98 2.2 Outdoor Unit ....................99 3. Service Diagnosis ................... 100 3.1 CTXS, FTXS, CDXS, FDXS, FVXS Series ..........100 3.2 FFQ Series ....................
  • Page 108 SiUS121602E 7.10 Input Overcurrent Detection ..............147 7.11 Four Way Valve Abnormality..............148 7.12 Discharge Pipe Temperature Control............150 7.13 High Pressure Control in Cooling ............. 151 7.14 Compressor Sensor System Abnormality ..........152 7.15 Position Sensor Abnormality ..............154 7.16 CT or Related Abnormality ...............

  • Page 109: General Problem Symptoms And Check Items

    SiUS121602E General Problem Symptoms and Check Items 1. General Problem Symptoms and Check Items Reference Problem Symptom Check Item Details Page None of the units operates. Check the power supply. Check if the rated voltage is supplied. — Check the types of the indoor units. Check if the indoor unit type is compatible with —...

  • Page 110: Troubleshooting With Led

    Troubleshooting with LED SiUS121602E 2. Troubleshooting with LED Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.

  • Page 111: Outdoor Unit

    SiUS121602E Troubleshooting with LED Caution: When operation stops suddenly and the operation lamp blinks, it could be operation mode conflict. 1) Check if the operation modes all the same for the indoor units connected to multi system outdoor unit? 2) If not, set all the indoor units to the same operation mode and confirm that the operation lamp is not blinking.

  • Page 112: Service Diagnosis

    Service Diagnosis SiUS121602E 3. Service Diagnosis CTXS, FTXS, CDXS, FDXS, FVXS Series 3.1.1 ARC452 Series Remote Controller 1. When TIMER CANCEL button is held down for 5 seconds, 00 is displayed on the temperature Method 1 display screen. TIMER CANCEL button <...
  • Page 113 SiUS121602E Service Diagnosis 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 114 Service Diagnosis SiUS121602E 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 115 SiUS121602E Service Diagnosis 3.1.2 ARC466 Series Remote Controller 1. When Timer Cancel button is held down for 5 seconds, 00 is displayed on the temperature Method 1 display screen. Timer Cancel button (R21282) < ARC466 Series > 2. Press Timer Cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
  • Page 116 Service Diagnosis SiUS121602E Method 2 1. Press the center of Temp button and Mode button at the same time. (R11669) is displayed on the LCD. (R11821) 2. Select 5C (service check) with Temp or Temp button. 3. Press Mode button to enter the service check mode. (R11672) The left-side number blinks.
  • Page 117 SiUS121602E Service Diagnosis 5. 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. 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.

  • Page 118: Ffq Series

    Service Diagnosis SiUS121602E FFQ Series 3.2.1 BRC1E71/72/73 Note: The illustrations are for BRC1E72 as representative. Relations Between Modes <Main Menu> • Airflow Direction • Quick Start • Schedule • Off Timer • Celsius / Fahrenheit • Maintenance Information • Configuration •...
  • Page 119 SiUS121602E Service Diagnosis Service Check The following message is displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Function Screen Operation lamp Menu/OK button (R18817) (1) Check if it is error or warning.
  • Page 120 Service Diagnosis SiUS121602E 3.2.2 BRC7E830 Relations The following modes can be selected by using the INSPECTION/TEST button on the remote controller. Between Modes Press INSPECTION/TEST button for more than 4 seconds. Service data can be obtained. Indoor unit settings can be made. Error code history Filter cleaning sign time Field...
  • Page 121 SiUS121602E Service Diagnosis Step Action Press UP or DOWN button and change the UNIT No. until the receiver of the remote controller starts to beep. UP button DOWN button (R15408) If you hear... Then... 3 short beeps Follow all steps below. 1 short beep Follow steps 3 and 4.
  • Page 122 Service Diagnosis SiUS121602E Step Action Press UP or DOWN button to change the error code upper digit until the receiver of the remote controller starts to beep. DOWN UP button DOWN button (R15411) If you hear... Then... 2 short beeps The upper digit matches.
  • Page 123 SiUS121602E Service Diagnosis Step Action Press UP or DOWN button and change the error code lower digit until the receiver of the remote controller generates a continuous beep. DOWN UP button DOWN button (R15413) Press MODE button to return to the normal mode. If you do not press any button for 1 minutes, the remote controller automatically returns to the normal mode.

  • Page 124: Code Indication On Remote Controller

    Code Indication on Remote Controller SiUS121602E 4. Code Indication on Remote Controller CTXS, FTXS, CDXS, FDXS, FVXS Series Error Codes Description Reference Page Normal condition — Indoor unit PCB abnormality Freeze-up protection control/heating peak-cut control DC motor (CTXS, FTXS, FVXS series) Fan motor or related abnormality AC motor (CDXS, FDXS series)

  • Page 125: Outdoor Unit

    SiUS121602E Code Indication on Remote Controller Outdoor Unit : ON, : OFF, : Blinks Outdoor Unit LED Indication Error Reference Green Description Codes Page h 00 Normal condition — Unspecified voltage (between indoor unit and outdoor unit) Anti-icing control in other rooms (U0) Refrigerant shortage h U2...

  • Page 126: Troubleshooting For Ctxs, Ftxs, Cdxs, Fdxs, Fvxs Series

    Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E 5. Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings.
  • Page 127 SiUS121602E Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the combination of the indoor and outdoor unit. Match the compatible models.

  • Page 128: Freeze-Up Protection Control/Heating Peak-Cut Control

    Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Freeze-up Protection Control/Heating Peak-cut Control Error Code Method of Error Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated according Detection to the temperature detected by the indoor heat exchanger thermistor. Heating peak-cut control During heating operation, the temperature detected by the indoor heat exchanger thermistor is used for the heating peak-cut control (operation halt, outdoor fan stop, etc.)

  • Page 129: Fan Motor Or Related Abnormality

    SiUS121602E Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series Fan Motor or Related Abnormality 5.3.1 DC Motor (CTXS, FTXS, FVXS Series) Error Code Method of Error The rotation speed detected by the Hall IC during fan motor operation determines abnormal fan Detection motor operation.
  • Page 130 Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply Check No.02 voltage. Refer to P.165 Is the voltage fluctuation Correct the power...
  • Page 131 SiUS121602E Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series 5.3.2 AC Motor (CDXS, FDXS Series) Error code Method of Error The rotation speed detected by the Hall IC during fan motor operation determines abnormal fan motor operation. Detection Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap.
  • Page 132 Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.04 Refer to P.165 Check the power supply voltage. Is the voltage fluctuation Correct the power supply.

  • Page 133: Thermistor Or Related Abnormality

    SiUS121602E Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series 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 4.96 V and more or 0.04 V and less during compressor operation.

  • Page 134: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Signal Transmission Error (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The data received from the outdoor unit in signal transmission 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...
  • Page 135 SiUS121602E Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Check the power supply voltage. Refer to P.166 Is the voltage fluctuation Correct the power supply.

  • Page 136: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121602E Unspecified Voltage (Between 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 indoor/outdoor transmission signal. Detection Error Decision The pair type and multi type are interconnected.

  • Page 137: Troubleshooting For Ffq Series

    SiUS121602E Troubleshooting for FFQ Series 6. Troubleshooting for FFQ Series Indoor Unit PCB Abnormality Error Code Method of Error The system checks the data from EEPROM. Detection Error Decision 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 138: Drain Level Control System Abnormality

    Troubleshooting for FFQ Series SiUS121602E Drain Level Control System Abnormality Error Code Method of Error The float switch detects error. Detection Error Decision The water level reaches its upper limit and the float switch turns OFF. Conditions Supposed Defective drain pump Improper drain piping work Causes Clogged drain piping...

  • Page 139: Fan Motor (Ac Motor) Or Related Abnormality

    SiUS121602E Troubleshooting for FFQ Series Fan Motor (AC Motor) or Related Abnormality Error Code Method of Error The signal from the fan motor detects abnormal fan speed. Detection Error Decision The fan rotations are not detected while the output voltage to the fan is at its maximum. Conditions Supposed Disconnection, short circuit or disengagement of connector in fan motor harness...

  • Page 140: Drain System Abnormality

    Troubleshooting for FFQ Series SiUS121602E Drain System Abnormality Error Code Method of Error Water leakage is detected based on the float switch ON/OFF changeover while the compressor is not operating. Detection Error Decision The float switch changes from ON to OFF while the compressor is OFF. Conditions Supposed Error in the drain pipe installation...

  • Page 141: Thermistor Or Related Abnormality

    SiUS121602E Troubleshooting for FFQ Series 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 voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less during Conditions compressor operation.

  • Page 142: Remote Controller Thermistor Abnormality

    Troubleshooting for FFQ Series SiUS121602E Remote Controller Thermistor Abnormality Error Code Method of Error Even if remote controller thermistor is faulty, system is possible to operate by system thermistor. Malfunction detection is carried out by the temperature detected by the remote controller Detection thermistor.

  • Page 143: Signal Transmission Error (Between Indoor Unit And Remote Controller)

    SiUS121602E Troubleshooting for FFQ Series Signal Transmission Error (Between Indoor Unit and Remote Controller) Error Code Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal transmission between indoor unit and remote controller (main and sub) is normal. Detection Error Decision Normal transmission does not continue for specified period.

  • Page 144: Signal Transmission Error (Between Main Remote Controller And Sub Remote Controller)

    Troubleshooting for FFQ Series SiUS121602E Signal Transmission Error (Between MAIN Remote Controller and SUB Remote Controller) Error Code Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal transmission between MAIN remote controller and SUB remote controller is normal. Detection Error Decision Normal transmission does not continue for specified period.

  • Page 145: Field Setting Abnormality

    SiUS121602E Troubleshooting for FFQ Series Field Setting Abnormality Error Code Error Decision Incorrect field setting Conditions Supposed Defective indoor unit PCB Defective outdoor unit PCB Causes Improper power supply Indoor-outdoor, indoor-indoor unit transmission wiring Defective remote controller wiring Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged.

  • Page 146: Troubleshooting For Outdoor Unit

    Troubleshooting for Outdoor Unit SiUS121602E 7. Troubleshooting for Outdoor Unit Refrigerant Shortage Error Code Outdoor Unit LED Display Method of Error Refrigerant shortage is detected by checking the input current value and the compressor output frequency. If the refrigerant is short, the input current is smaller than the normal value. Detection Error Decision The following conditions continue for 7 minutes.
  • Page 147 SiUS121602E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.164 Any thermistor Replace the thermistor(s) disconnected? position. ∗ Discharge pipe thermistor ∗...

  • Page 148: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting for Outdoor Unit SiUS121602E Low-voltage Detection or Over-voltage Detection Error Code Outdoor Unit LED Display Method of Error Indoor Unit Detection The zero-cross detection of the power supply is evaluated by the indoor unit PCB. Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit.
  • Page 149 SiUS121602E 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 150: Wiring Error Check Unexecuted

    Troubleshooting for Outdoor Unit SiUS121602E Wiring Error Check Unexecuted Error Code Outdoor Unit LED 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 error check after the memory was cleared.

  • Page 151: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)/Anti-Icing Control In Other Rooms

    SiUS121602E 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 Display Method of Error A wrong connection is detected by checking the combination of indoor and outdoor units on the Detection microcomputer.

  • Page 152: Anti-Icing Control For Indoor Unit

    Troubleshooting for Outdoor Unit SiUS121602E Anti-icing Control for Indoor Unit Error Code Outdoor Unit LED Display Method of Error During cooling operation, indoor unit icing is detected by checking the temperatures sensed by the indoor heat exchanger thermistor and room temperature thermistor that are located in a shut-down Detection room.
  • Page 153 SiUS121602E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.164 Check the wiring and piping. Check No.12 Wrong wiring or Activate the wiring error check piping? Refer to P.167...

  • Page 154: Outdoor Unit Pcb Abnormality

    Troubleshooting for Outdoor Unit SiUS121602E Outdoor Unit PCB Abnormality Error Code Outdoor Unit LED Display Method of Error Detect within the program of the microcomputer. Detection Error Decision The program of the microcomputer is in abnormal running order. Conditions Supposed Defective outdoor unit PCB Noise Causes...

  • Page 155: Ol Activation (Compressor Overload)

    SiUS121602E Troubleshooting for Outdoor Unit OL Activation (Compressor Overload) Error Code Outdoor Unit LED Display Method of Error A compressor overload is detected through compressor OL. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Conditions Supposed Disconnection of discharge pipe thermistor...
  • Page 156 Troubleshooting for Outdoor Unit SiUS121602E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.164 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.167 Check No.

  • Page 157: Compressor Lock

    SiUS121602E Troubleshooting for Outdoor Unit Compressor Lock Error Code Outdoor Unit LED Display Method of Error A compressor lock is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision Judging from the current waveform generated when high-frequency voltage is applied to the compressor.

  • Page 158: Dc Fan Lock

    Troubleshooting for Outdoor Unit SiUS121602E DC Fan Lock Error Code Outdoor Unit LED Display Method of Error An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Detection Error Decision The fan does not start in 30 seconds even when the fan motor is running. If the error repeats, the system is shut down.

  • Page 159: Input Overcurrent Detection

    SiUS121602E Troubleshooting for Outdoor Unit 7.10 Input Overcurrent Detection Error Code Outdoor Unit LED Display Method of Error Detected by checking the input current value Detection Error Decision The input current is at a certain value (depending on the condition) for 2.5 seconds. The compressor halts if the error occurs, and restarts automatically after 3-minute standby.

  • Page 160: Four Way Valve Abnormality

    Troubleshooting for Outdoor Unit SiUS121602E 7.11 Four Way Valve Abnormality Error Code Outdoor Unit LED Display Method of Error The liquid pipe thermistor and the outdoor heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode. Detection Error Decision A following condition continues for A seconds after the compressor has started.
  • Page 161 SiUS121602E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.164 Four way valve coil Correct the four way valve disconnected (loose)? coil.

  • Page 162: Discharge Pipe Temperature Control

    Troubleshooting for Outdoor Unit SiUS121602E 7.12 Discharge Pipe Temperature Control Error Code Outdoor Unit LED Display Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision If the temperature detected by the discharge pipe thermistor rises above , the compressor stops.

  • Page 163: High Pressure Control In Cooling

    SiUS121602E Troubleshooting for Outdoor Unit 7.13 High Pressure Control in Cooling Error Code Outdoor Unit LED Display Method of Error High pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Detection Error Decision The temperature sensed by the outdoor heat exchanger thermistor rises above...

  • Page 164: Compressor Sensor System Abnormality

    Troubleshooting for Outdoor Unit SiUS121602E 7.14 Compressor Sensor System Abnormality Error Code Outdoor Unit LED Display Method of Error The system checks the power supply voltage and the DC voltage before the compressor starts. The system checks the DC current of the compressor right after the compressor starts. Detection Power DC voltage...
  • Page 165 SiUS121602E 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.

  • Page 166: Position Sensor Abnormality

    Troubleshooting for Outdoor Unit SiUS121602E 7.15 Position Sensor Abnormality Error Code Outdoor Unit LED Display Method of Error A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 5 minutes without any other error Conditions Supposed...
  • Page 167 SiUS121602E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Turn off the power. Refer to P.169 Check the power supply voltage. Check No.18 Refer to P.171 Voltage as rated? Correct the power supply.

  • Page 168: Ct Or Related Abnormality

    Troubleshooting for Outdoor Unit SiUS121602E 7.16 CT or Related Abnormality Error Code Outdoor Unit LED Display Method of Error A CT or related error is detected by checking the compressor running frequency and CT-detected input current. Detection Error Decision The compressor running frequency is more than Hz and input current is less than Conditions A (Hz)
  • Page 169 SiUS121602E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Turn off the power. Then, turn on Refer to P.169 the power to restart the system. Check No.21 Start operation.

  • Page 170: Thermistor Or Related Abnormality (Outdoor Unit)

    Troubleshooting for Outdoor Unit SiUS121602E 7.17 Thermistor or Related Abnormality (Outdoor Unit) H9 , J3 , J6 , J8 , J9 , P4 Error Code Outdoor Unit LED Display Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. A thermistor fault is identified based on the temperature sensed by each thermistor.
  • Page 171 SiUS121602E Troubleshooting for Outdoor Unit Troubleshooting In case of Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.164 Turn on the power again. Error displayed Reconnect the connectors again on remote or thermistors.

  • Page 172: Electrical Box Temperature Rise

    Troubleshooting for Outdoor Unit SiUS121602E 7.18 Electrical Box Temperature Rise Error Code Outdoor Unit LED Display Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Detection Error Decision With the compressor off, the radiation fin temperature is above The error is cleared when the temperature drops below Conditions To cool the electrical components, the outdoor fan starts when the radiation fin temperature...

  • Page 173: Radiation Fin Temperature Rise

    SiUS121602E Troubleshooting for Outdoor Unit 7.19 Radiation Fin Temperature Rise Error Code Outdoor Unit LED Display Method of Error A radiation fin temperature rise is detected by checking the radiation fin temperature with the compressor on. Detection Error Decision The radiation fin temperature with the compressor on is above The error is cleared when the temperature drops below Conditions 90°C (194°F)

  • Page 174: Output Overcurrent Detection

    Troubleshooting for Outdoor Unit SiUS121602E 7.20 Output Overcurrent Detection Error Code Outdoor Unit LED Display Method of Error An output overcurrent is detected by checking the current that flows in the inverter DC section. Detection Error Decision A position signal error occurs while the compressor is running. A rotation speed error occurs while the compressor is running.
  • Page 175 SiUS121602E Troubleshooting for Outdoor Unit Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output Refer to P.169 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 176: Check

    Check SiUS121602E 8. Check Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using multimeter. The data is for reference purpose only. Thermistor temperature Resistance (kΩ) °C °F –20 –4 197.8...

  • Page 177: Indoor Fan Motor Connector Check

    SiUS121602E Check Indoor Fan Motor Connector Check Check No.02 CTXS, FTXS, 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. Check rotation command voltage output (pins 4 - 2). 5.

  • Page 178: Power Supply Waveform Check

    Check SiUS121602E Power Supply Waveform Check Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance. Check if the power supply waveform is a sine wave (Fig.1). Check if there is waveform disturbance near the zero-cross (sections circled in Fig.2) [Fig.1] [Fig.2] (R1444)

  • Page 179: Electronic Expansion Valve Check

    SiUS121602E 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 a latching sound. 3.

  • Page 180: Four Way Valve Performance Check

    Check SiUS121602E Four Way Valve Performance Check Check No.13 Turn off the power. Then, turn on the power to restart the system. ∗ Four way valve coil Start heating operation. Cooling / Dry / Defrost: Not energized Heating: energized voltage at 208 - 230 Replace the outdoor unit VAC with compressor PCB (main PCB).

  • Page 181: Inverter Analyzer Check

    SiUS121602E Check Inverter Analyzer Check Check No.15 Characteristics Inverter analyzer: RSUK0917C If an abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (main PCB, power module, etc.).

  • Page 182: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiUS121602E Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) If all the LEDs are lit uniformly, the compressor is defective. → Replace the compressor. (2) If the LEDs are not lit uniformly, check the power module. → Refer to Check No.22. (3) If NG in Check No.22, replace the power module.

  • Page 183: Installation Condition Check

    SiUS121602E Check 8.10 Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air Change the installation suction and location or direction. discharge area. Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty? exchanger.

  • Page 184: Outdoor Fan System Check

    Check SiUS121602E 8.12 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor Is the lead wire connector outdoor fan running? Go to Check No. 16. disconnected? Reconnect the connector. Outdoor fan system is functioning. (R21195) 8.13 Main Circuit Short Check Check No.20...

  • Page 185: Capacitor Voltage Check

    SiUS121602E Check 8.14 Capacitor Voltage Check Check No.21 Before this check, be sure to check the main circuit for short circuit. With the circuit breaker still on, measure the voltage according to the drawing of the model in question. Be careful never to touch any live parts. Multimeter (DC.

  • Page 186: Power Module Check

    Check SiUS121602E 8.15 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 187: Part 7 Trial Operation And Field Settings

    SiUS121602E Part 7 Trial Operation and Field Settings 1. Pump Down Operation................176 2. Wiring Error Check Function ..............177 3. Trial Operation ..................179 3.1 CTXS, FTXS, CDXS, FDXS, FVXS Series ..........179 3.2 FFQ Series ....................181 4. Field Settings ..................183 4.1 Outdoor Unit .....................

  • Page 188: Pump Down Operation

    Pump Down Operation SiUS121602E 1. Pump Down Operation Pump Down In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit. Operation 1. Remove the valve caps from the liquid stop valve and the gas stop valve. 2.

  • Page 189: Wiring Error Check Function

    SiUS121602E Wiring Error Check Function 2. 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 190 Wiring Error Check Function SiUS121602E Details Refrigerant flows from Port A and on. The indoor heat exchanger temperatures are detected one by one to check up the matching between the piping and wiring. With this function on, freezing (crackling) noise may be heard from the indoor unit. This is not a problem.

  • Page 191: Trial Operation

    SiUS121602E Trial Operation 3. Trial Operation CTXS, FTXS, CDXS, FDXS, FVXS Series 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. Detail 1.
  • Page 192 Trial Operation SiUS121602E ARC466 Series (1) Press On/Off button to turn on the system. (2) Press the center of Temp button and Mode button at the same time. (3) Select T (trial operation) with Temp or Temp button. (4) Press Mode button to start the trial operation. (5) Press Mode button and select operation mode.

  • Page 193: Ffq Series

    SiUS121602E Trial Operation FFQ Series 3.2.1 Checkpoints To carry out test operation, check the following: Check that the temperature setting of the remote controller is at the lowest level in cooling operation or use test operation mode. Go through the following checklist: Checkpoints Cautions or warnings Are all units securely installed?
  • Page 194 Trial Operation SiUS121602E Step Action Remote controller How to check airflow direction Push Menu/OK button to enter Main Menu. buttons to select Airflow Direction and push Menu/OK button. (R18829) Check that the airflow direction is actuated according to the setting and push Menu/OK button.

  • Page 195: Field Settings

    SiUS121602E Field Settings 4. Field Settings Outdoor Unit 4.1.1 Priority Room Setting Outline 1. Operation mode 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 196 Field Settings SiUS121602E 4.1.2 COOL/HEAT Mode Lock Use 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 197: Ctxs, Ftxs, Cdxs, Fdxs, Fvxs Series

    SiUS121602E Field Settings CTXS, FTXS, CDXS, FDXS, FVXS Series 4.2.1 Model Type Setting ARC452A21, ARC452A23 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 198: Temperature Display Switch

    Field Settings SiUS121602E 4.2.2 Temperature Display Switch You can select Fahrenheit or Celsius for temperature display. ARC452A21, ARC452A23 Press TEMP and TEMP buttons at the same time for 5 seconds to change the unit of temperature display. (R14477) ARC466A21 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 199: When 2 Units Are Installed In 1 Room

    (1) Remove the front grille. (2) Remove the electrical box. Series (3) Remove the shield plate of the electrical box. (4) Cut the address setting jumper JA on the PCB. CTXS07LVJU, FTXS09/12LVJU FTXS15/18LVJU (R9665) (R17375) Caution Replace the PCB if you accidentally cut a wrong jumper.
  • Page 200 Field Settings SiUS121602E 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) Remove the shield plate (8 tabs).

  • Page 201: Jumper Settings

    For the location of the jumper, refer to the following pages. CTXS07LVJU, FTXS09/12LVJU: page 16 FTXS15/18LVJU: page 18 FDXS09/12LVJU, CDXS15/18LVJU: page 20 FVXS09/12/15/18NVJU: page 22 Trial Operation and Field Settings...

  • Page 202: Ffq Series

    Field Settings SiUS121602E FFQ Series 4.3.1 How to Change the Field Settings Outline If optional accessories are mounted on the indoor unit, the indoor unit setting may have to be changed. Refer to the instruction manual for each optional accessory. BRC1E71/72/73 Note: The illustrations are for BRC1E72 as representative.
  • Page 203 SiUS121602E Field Settings Step Action Remote controller Push Menu/OK button to display the confirmation screen. buttons to select Yes and push Menu/ OK button. (R18834) When multiple setting changes are needed, repeat steps 3 to 7. Push Cancel button 2 times to return to basic screen.
  • Page 204 Field Settings SiUS121602E 4.3.2 Overview of the Field Settings First Second Code No. Mode Code Description of setting Ultra Approx. Approx. longlife 10,000 5,000 filter hrs. hrs. Filter cleaning — — sign interval Approx. Approx. Longlife 2,500 1,250 filter hrs. hrs.
  • Page 205 SiUS121602E Field Settings 4.3.3 MAIN/SUB Setting when Using 2 Wired Remote Controllers Outline The MAIN/SUB setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to MAIN and the other to SUB.
  • Page 206 Field Settings SiUS121602E 4.3.4 Address and MAIN/SUB Setting for Wireless Remote Controller Outline If several wireless remote controller units are used together in the same room (including the case where both group control and individual remote controller control are used together), be sure to set the addresses for the receiver and wireless remote controller.
  • Page 207 SiUS121602E Field Settings Wireless Remote 1. Hold down FILTER SIGN RESET ( ) button and INSPECTION/TEST button at the same time for at least 4 seconds to enter the field setting mode. (SETTING is indicated on the display). Controller 2. Press FAN button and select A or b. Each time the button is pressed, the display switches (Factory Set is 1) between A and b.
  • Page 208 Field Settings SiUS121602E After Setting Stick the unit No. label at the decoration panel air discharge outlet as well as on the back of the wireless remote controller. Wireless remote controller Unit No. label Decoration panel (R12961) Note: Set the unit No. of the receiver and the wireless remote controller to be the same. If the settings differ, the signal from the remote controller cannot be received.

  • Page 209: Silicone Grease On Power Transistor / Diode Bridge

    SiUS121602E Silicone Grease on Power Transistor / Diode Bridge 5. Silicone Grease on Power Transistor / Diode Bridge Outline Apply the specified silicone grease to the heat radiation part of a power transistor / diode bridge when you replace an outdoor unit PCB. The silicone grease encourages the heat radiation of a power transistor / diode bridge.

  • Page 210: Part 8 Appendix

    SiUS121602E Part 8 Appendix 1. Piping Diagrams..................199 1.1 Indoor Unit....................199 1.2 Outdoor Unit ..................... 201 2. Wiring Diagrams..................202 2.1 Indoor Unit....................202 2.2 Outdoor Unit ..................... 207 Appendix...

  • Page 211: Piping Diagrams

    SiUS121602E Piping Diagrams 1. Piping Diagrams Indoor Unit CTXS07LVJU, FTXS09/12LVJU FTXS15/18LVJU INDOOR UNIT INDOOR UNIT 5/16 CuT 1/4 CuT DISTRIBUTOR HEAT EXCHANGER HEAT EXCHANGER THERMISTOR CROSS FLOW FAN ON HEAT EXCH. THERMISTOR FIELD PIPING CROSS FLOW FAN ON HEAT EXCH.
  • Page 212 Piping Diagrams SiUS121602E FVXS09/12NVJU FVXS15/18NVJU INDOOR UNIT INDOOR UNIT MUFFLER ASSY HEAT EXCHANGER MUFFLER ASSY HEAT EXCHANGER 1/4 CuT 9/32 CuT 1/4 CuT 9/32 CuT 1/4 CuT 1/4 CuT 1/4 CuT THERMISTOR THERMISTOR ON HEAT EXCH. ON HEAT EXCH. 1/4 CuT 1/4 CuT 1/4 CuT FIELD PIPING...

  • Page 213: Outdoor Unit

    SiUS121602E Piping Diagrams Outdoor Unit 2MXL18QMVJU OUTDOOR UNIT ELECTRONIC LIQUID PIPE HEAT EXCHANGER EXPANSION VALVE THERMISTOR OUTDOOR AIR 5/16 CuT 1/4 CuT 5/16 CuT HEADER THERMISTOR ROOM A (1/4 CuT) FIELD FILTER PIPING 5/16 CuT 1/4 CuT LIQUID 5/16 CuT ROOM B HEAT EXCHANGER (1/4 CuT)

  • Page 214: Wiring Diagrams

    Wiring Diagrams SiUS121602E 2. Wiring Diagrams Indoor Unit CTXS07LVJU, FTXS09/12LVJU PCB3 PCB1 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 C101 GRN/YLW TRANSMISSION CIRCUIT CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.
  • Page 215 SiUS121602E Wiring Diagrams FTXS15/18LVJU PCB3 PCB1 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 C101 TRANSMISSION CIRCUIT CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY t˚ IS TURNED OFF AND THEN BACK ON AGAIN. : BUZZER RTH1 C101, C102 : CAPACITOR...
  • Page 216 Wiring Diagrams SiUS121602E FDXS09/12LVJU, CDXS15/18LVJU → V1TR 3.15A OUTDOOR LED LED GRN/YLW FIELD WIRING. TERMINAL FOR CAUTION TRANSMISSION CENTRALIZED CONTROL CIRCUIT NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK SIGNAL ON AGAIN. RECEIVER RTH1 H1P~H3P...
  • Page 217 SiUS121602E Wiring Diagrams FVXS09/12/15/18NVJU WIRING DIAGRAM PCB3 PCB2 → RECTIFIER S2W ( 4 ) 3.15A OUTDOOR GRN/YLW FIELD WIRING. MR10 WIRELESS TRANSMISSION REMOTE CIRCUIT CAUTION CONTROLLER PCB4 NOTE THAT OPERATION WILL SIGNAL RESTART AUTOMATICALLY IF RECEIVER THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.
  • Page 218 Wiring Diagrams SiUS121602E FFQ09/12/15/18LVJU PRINTED CIRCUIT BOARD PILOT LAMP : CONNECTER DISCRIMINATION COLOR FOR COMPONENTS. CAPACITOR ( M1F ) ( ON-RED ) : CONNECTER COLOR FOR COMPONENTS. FUSE ( F , 5A , 250V ) PILOT LAMP : CONNECTER COLOR FOR PRINTED CIRCUIT BOARD. PILOT LAMP ( TIMER-GREEN ) ( SERVICE MONITOR GREEN )

  • Page 219: Outdoor Unit

    SiUS121602E Wiring Diagrams Outdoor Unit 2MXL18QMVJU WIRING DIAGRAM GRN/YLW PCB2 POWER SUPPLY S501 S502 TO INDOOR UNIT X11A ROOM B PCB1 S201 S202 TO INDOOR UNIT ROOM A MRM20 MRM10 3.15A V401 3.15A C110 IPM1 ROOM A ROOM B t˚ t˚...
  • Page 220 Wiring Diagrams SiUS121602E 3MXL24QMVJU WIRING DIAGRAM GRN/YLW PCB2 POWER SUPPLY S501 S502 TO INDOOR UNIT X11A ROOM B PCB1 1 S202 S201 TO INDOOR UNIT ROOM A MRM20 MRM10 TO INDOOR UNIT ROOM C 3.15A W V U V401 3.15A C110 IPM1 ROOM A...
  • Page 221 Revision History Month / Year Version Revised contents 03 / 2016 SiUS121602E First edition...
  • Page 222 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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