SiUS041829E Service Manual Inverter Pair Wall Mounted Type FTXR-T Series [Applied Models] Inverter Pair : Heat Pump
SiUS041829E 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 ..........................................................................................
SiUS041829E 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 Discharge Pipe Temperature Control......................................................... 50 Input Current Control.................................................................................. 51 Freeze-up Protection Control ..................................................................... 52 Heating Peak-cut Control ........................................................................... 52 Outdoor Fan Control................................
SiUS041829E 4.25 Output Overcurrent Detection .................................................................. 109 5. Check ......................................................................................................112 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 Thermistor Resistance Check .................................................................. 112 Indoor Fan Motor Connector Check .........................................................
SiUS041829E 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 ...........................................................
Safety Cautions SiUS041829E 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 inspection. Caution Items The caution items are classified into Warning and Caution.
SiUS041829E 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. Plugging in or unplugging the power cable to operate the equipment may cause an electrical shock or fire.
Safety Cautions SiUS041829E 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. 1.2 Warnings and Cautions Regarding Safety of Users Warning Do not store the equipment in a room with fire sources (e.g.
SiUS041829E Safety Cautions Warning Do not mix air or gas other than the specified refrigerant (R-32 / R410A / 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. After charging the refrigerant, make sure that there is no leak.
Safety Cautions SiUS041829E 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. Do not tilt the unit when removing it. The water inside the unit may spill and wet the furniture and floor.
SiUS041829E Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Warning Caution Note Reference Introduction Type of Description Information Warning Warning is used when there is danger of personal injury. Caution Note Reference Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part of) a procedure.
Revision History SiUS041829E 3.
SiUS041829E Part 1 General Information 1. Applicable Models .....................................................................................10 1.1 Heat Pump ................................................................................................. 10 2. Functions...................................................................................................
Applicable Models SiUS041829E 1. Applicable Models 1.
SiUS041829E Functions 2.
Functions SiUS041829E Category Remote Control — 12 Functions FTXR Series R/C with back light °F/°C changeover R/C temperature display (factory setting: °F) Remote control adaptor (normal open pulse contact) Option Remote control adaptor (normal open contact) Option DIII-NET compatible Option Wireless LAN connection Option Wired remote controller Option : Available : Not available Part 1 General Information
SiUS041829E Part 2 Specifications 1. Specifications ............................................................................................
Specifications SiUS041829E 1. Specifications Model Indoor Unit Outdoor Unit FTXR09TVJUW RX09RMVJU9 FTXR09TVJUS RX09RMVJU9 Cooling Power Supply Phase Hz, V Btu/h W % Capacity Rated (Min. - Max.) Power Consumption (Rated) Power Factor (Rated) SEER / HSPF EER (Rated) Btu/Wh COP (Rated) W/W Piping Liquid in. (mm) Connection Gas in. (mm) Drain in. (mm) Max. Interunit Piping Length ft (m) Max.
SiUS041829E Model Specifications Indoor Unit Outdoor Unit FTXR12TVJUW RX12RMVJU9 FTXR12TVJUS RX12RMVJU9 Cooling Power Supply Phase Hz, V Btu/h W % Capacity Rated (Min. - Max.) Power Consumption Rated Power Factor Rated SEER / HSPF EER Rated Btu/Wh COP Rated W/W Piping Liquid in. (mm) Connection Gas in. (mm) Drain in. (mm) Max. Interunit Piping Length ft (m) Max.
Specifications Model SiUS041829E Indoor Unit Outdoor Unit FTXR18TVJUW RX18RMVJU9 FTXR18TVJUS RX18RMVJU9 Cooling Power Supply Phase Hz, V Btu/h W % Capacity Rated (Min. - Max.) Power Consumption Rated Power Factor Rated SEER / HSPF EER Rated Btu/Wh COP Rated W/W Piping Liquid in. (mm) Connection Gas in. (mm) Drain in. (mm) Max. Interunit Piping Length ft (m) Max.
SiUS041829E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit.................................................................................................18 1.1 FTXR09/12/18TVJUW(S)........................................................................... 18 2. Outdoor Unit..............................................................................................20 2.1 RX09/12RMVJU9 ....................................................................................... 20 2.
Indoor Unit SiUS041829E 1. Indoor Unit 1.
SiUS041829E Display/Signal Receiver PCB (A2P) Indoor Unit 1) 2) 3) S51 S52 S1W 4) 5) 6) H1P H2P JA Connector for control PCB (A1P) Connector for room temperature thermistor Indoor unit ON/OFF switch (Forced cooling operation ON/OFF switch) Refer to page 126 for details of forced cooling operation. LED for operation (multi-color) LED for INTELLIGENT EYE (green) Address setting jumper Refer to page 129 for details.
Outdoor Unit SiUS041829E 2. Outdoor Unit 2.
SiUS041829E 2.2 Outdoor Unit RX18RMVJU9 Main PCB 1) 2) 3) 4) 5) S20 S40 S70 S80 S90 6) 7) 8) 9) 10) 11) HL1, HN1, S E1, E2 U, V, W FU1, FU2 FU3 J6 12) 13) LED A V1, V2, V3 Connector for electronic expansion valve coil Connector for overload protector Connector for DC fan motor Connector for four way valve coil Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) Connector for terminal block Terminal for ground Connector for compressor Fuse (3.
SiUS041829E Part 4 Functions and Control 1. Main Functions..........................................................................................23 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 1.14 1.15 Temperature Control .................................................................................. 23 Frequency Principle.................................................................................... 23 Airflow Direction Control.......................................................
SiUS041829E Main Functions 1. Main Functions 1.1 Temperature Control Definitions of Temperatures The definitions of temperatures are classified as following.
Main Functions SiUS041829E When the frequency decreases, the rotation speed of the compressor decreases resulting in a decrease of refrigerant circulation. This leads to a smaller amount of heat exchange per unit.
SiUS041829E 1.3 Main Functions Airflow Direction Control Power-Airflow Dual Flaps The large flap sends a large volume of air downward to the floor and provides an optimum control in cooling, dry and heating operation. Cooling/Dry During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room. Heating During heating operation, the large flap directs airflow downward to spread the warm air to the entire room.
Main Functions 1.4 SiUS041829E 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. Automatic Fan Speed Control In automatic fan speed operation, the step SL is not available.
SiUS041829E 1.5 Main Functions 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. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones.
Main Functions 1.6 SiUS041829E 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.
SiUS041829E 1.7 Main Functions Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Details Thermostat OFF Conditions The temperature difference is in the zone A. Thermostat ON Conditions The temperature difference returns to the zone C after being in the zone A. The system resumes from defrost control in any zones except A. The operation turns on in any zones except A.
Main Functions 1.8 SiUS041829E NIGHT SET Mode Outline When the OFF TIMER is set, NIGHT SET mode is automatically activated. NIGHT SET mode keeps the airflow rate setting. Details NIGHT SET mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers the target temperature slightly in the case of heating.
SiUS041829E 1.9 Main Functions 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 button on the wireless remote controller. Details When this function is activated, the maximum capacity also decreases.
Main Functions SiUS041829E 1.10 2-Area INTELLIGENT EYE Operation 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. Dividing the room into plural areas and detecting presence of humans in each area. Moving the airflow direction to the area with no human automatically to avoid direct airflow on humans. Details 1.
SiUS041829E Main Functions 2. Motions (in cooling) within 20 min. Human detection signal ON OFF within 20 min. within 20 min. 20 min. ↑ Reset ↑ Reset ↑ Reset 1 ~ 2°C (1.8 ~ 3.6 °F) Target temperature Remote controller Sensor button ON OFF Operation ON OFF Set speed Set speed 60 rpm Fan speed (#) OFF (R23920) In FAN operation, the fan speed is reduced by 60 rpm when no one is in the area.
Main Functions SiUS041829E 1.11 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. Details When POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
SiUS041829E Main Functions 1.12 Multi-Monitor Lamp/TIMER Lamp 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) The lamp color changes according to the operation. AUTO..................................................Red/Blue DRY....................................................Green COOL.........................
Main Functions SiUS041829E 1.13 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press Clock button. is displayed, then MON and blink. 2. Press Select or Select button to set the clock to the current day of the week. 3. Press Clock button. blinks. 4. Press Select or Select button to set the clock to the present time. Holding down Select or Select button rapidly increases or decreases the time display. 5. Press Clock button to set the clock.
SiUS041829E Main Functions 1.14 WEEKLY TIMER Operation 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. Details Setting example of the WEEKLY TIMER The same timer settings are used from Monday through Friday, while different timer settings are used for the weekend. [Monday] Make timer settings for programs 1-4.
Main Functions SiUS041829E 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 ON OFF ON 8:30 17:30 [Monday] program 3 77°F (25°C) 6:00 program 4 OFF 81°F (27°C) 22:00 Setting Displays Day and number 1. Press ON/OFF Time Temperature . • The day of the week and the reservation number of the current day will be displayed. • 1 to 4 settings can be made per day. 2.
SiUS041829E Main Functions 6. 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 9 when setting the OFF TIMER. 7. Press . • The time will be set. •“ ” and the temperature blink. 8. Press to select the desired temperature. • The temperature can be set between 50°F (10°C) and 90°F (32°C).
Main Functions SiUS041829E 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 ON [Monday] OFF 77°F (25°C) 6:00 program 4 ON OFF 81°F (27°C) 8:30 17:30 22:00 COPY program 1 [Tuesday] to [Friday] program 2 program 3 ON OFF ON 8:30 17:30 77°F (25°C) 6:00 program 4 OFF 81°F (27°C) 22:00 Setting Displays Confirmation Copy Paste Normal 1. Press . 2.
SiUS041829E Main Functions Confirming a reservation • The reservation can be confirmed. Setting Displays Normal Confirmation 1. Press . • The day of the week and the reservation number of the current day will be displayed. 2. Press to select the day of the week and the reservation number to be confirmed. • Pressing displays the reservation details. • To change the confirmed reserved settings, select the reservation number and press . The mode is switched to setting mode.
Main Functions SiUS041829E To delete reservations An individual reservation 1. Press . • The day of the week and the reservation number will be displayed. 2. Press to select the day of the week and the reservation number to be deleted. 3. Press •“ . ” and “ 4. Press • Pressing ” or “ ” blink. until no icon is displayed. changes the ON/OFF TIMER mode in sequence. • Selecting “blank” will cancel any reservation you may have. blank ON TIMER OFF TIMER 5.
SiUS041829E Main Functions 1.15 Other Functions 1.15.1 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. Note(s) The cold air blast is prevented using similar control when defrost control starts or when the thermostat is turned ON. 1.15.
Thermistor Functions SiUS041829E 2. Thermistor Functions (3) Outdoor Temperature Thermistor Expansion valve (5) Room Temperature Thermistor (2) Outdoor Heat Exchanger Thermistor Four way valve (4) Indoor Heat Exchanger Thermistor Compressor (1) Discharge Pipe Thermistor (R23851) (1) Discharge Pipe Thermistor The discharge pipe thermistor is used for controlling discharge pipe temperature.
SiUS041829E Control Specification 3. Control Specification 3.1 Mode Hierarchy Outline The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing.
Control Specification 3.2 SiUS041829E Frequency Control Outline The compressor frequency is determined according to the difference between the room thermistor temperature and the target temperature. When the shift of the frequency is less than zero (ΔF<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
SiUS041829E Control Specification D signal for cooling Temperature difference D signal Temperature difference D signal Temperature difference –2.0°C (–3.6°F) OFF 0°C (0°F) –1.5°C (–2.7°F) 1 0.5°C (0.9°F) 4 2.0°C (3.6°F) 8 4.0°C (7.2°F) 12 5 2.5°C (4.5°F) 9 4.5°C (8.1°F) 13 –1.0°C (–1.8°F) 2 1.0°C (1.8°F) 6 3.0°C (5.4°F) 10 5.0°C (9.0°F) 14 –0.5°C (–0.9°F) 3 1.5°C (2.7°F) 7 3.5°C (6.3°F) 11 5.5°C (9.
Control Specification 3.3 SiUS041829E Controls at Mode Changing/Start-up 3.3.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the outdoor temperature, the discharge pipe temperature, the radiation fin temperature and the preheating command from the indoor unit. Details Outdoor temperature ≥ –2.5°C (27.5°F) Control A (preheating for normal state) Outdoor temperature < –2.5°C (27.
SiUS041829E Control Specification 3.3.3 Four Way Valve Operation Compensation Outline At the beginning of operation as the four way valve is switched, the pressure difference to activate the four way valve is acquired when the output frequency is higher than a certain fixed frequency, for a certain fixed time. Details Starting Conditions 1. When the compressor starts and the four way valve switches from OFF to ON 2. When the four way valve switches from ON to OFF during operation 3.
Control Specification 3.4 Outline SiUS041829E Discharge Pipe Temperature Control 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.
SiUS041829E 3.5 Outline Control Specification Input Current Control 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.
Control Specification 3.6 SiUS041829E Freeze-up Protection Control 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. Details The operating frequency limitation is judged with the indoor heat exchanger temperature. Indoor heat exchanger temperature (R2T) (Reference) 13°C (55.4°F) Reset zone 6.5°C (44°F) Up zone 6°C (43°F) Keep zone 5.
SiUS041829E 3.8 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. 3. Fan OFF delay when stopped The outdoor fan is turned OFF 60 ~ 70 seconds after the compressor stops. 4.
Control Specification SiUS041829E 3.10 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting. Details Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature. The system is in heating operation. The compressor operates for 6 minutes.
SiUS041829E Control Specification 3.11 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Open Control 1. Electronic expansion valve control when starting operation 2. Electronic expansion valve control when the frequency changes 3. Electronic expansion valve control for defrosting 4.
Control Specification SiUS041829E 3.11.1 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. 3.11.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens, and develops the pressure equalization. 3.11.
SiUS041829E Control Specification 3.11.7 Discharge Pipe Thermistor Disconnection Control Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensation temperature. If the discharge pipe thermistor is disconnected, the electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.
Control Specification SiUS041829E 3.11.8 Target Discharge Pipe Temperature Control The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger temperature, and the electronic expansion valve opening is adjusted so that the actual discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect SH (superheating) control using the discharge pipe temperature) The target discharge pipe temperature is set as to become the target SH.
SiUS041829E Part 5 Remote Controller 1. Applicable Remote Controller ...................................................................60 2. ARC466A36 ..............................................................................................
Applicable Remote Controller SiUS041829E 1. Applicable Remote Controller Note 60 Series Model Name Remote Controller Reference Page FTXR-T FTXR09TVJUW(S) FTXR12TVJUW(S) FTXR18TVJUW(S) ARC466A36 61 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.
SiUS041829E ARC466A36 2. ARC466A36 Signal transmitter Receiver 19-11/16" (50 cm) or more Display (LCD) • Displays the current settings. (In this illustration, each section is shown with all its displays on for the purpose of explanation.) • To use the remote controller, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote controller, such as a curtain, the unit will not operate. • The maximum distance for communication is about 19-11/16 ft (6 m).
ARC466A36 SiUS041829E Open the Front Cover Mode button • Selects the operation mode. AUTO DRY COOL HEAT FAN Econo4 / Quiet button • Every time you press Econo/Quiet button, the setting changes in the following order. Lamp brightness setting button ECONO • Each time you press Brightness button, the brightness of the indoor unit display changes to high, low, or off. Blank No setting Combination • OUTDOOR UNIT QUIET operation is not available in FAN and DRY operation.
SiUS041829E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items .........................................65 2. Troubleshooting with LED .........................................................................66 2.1 Indoor Unit.................................................................................................. 66 2.2 Outdoor Unit ............................................................................................... 66 3. Service Diagnosis ...........................
SiUS041829E 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 64 Inverter Unit Refrigerant System Check................................................... 115 Inverter Analyzer Check ........................................................................... 116 Rotation Pulse Check on the Outdoor Unit PCB ...................................... 117 Installation Condition Check..................................................................... 118 Discharge Pressure Check..............................................
SiUS041829E General Problem Symptoms and Check Items 1. General Problem Symptoms and Check Items Symptom Check Item The unit does not operate. Check the power supply. Check if the rated voltage is supplied. — Check the type of the indoor unit. Check if the indoor unit type is compatible with the outdoor unit. — Check the outdoor temperature. Heating/cooling operations are not available when the outdoor temperature is out of the operation limit. Check the reference page for the operation limit.
Troubleshooting with LED SiUS041829E 2. Troubleshooting with LED 2.1 Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. A protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions. A signal transmission error occurs between the indoor and outdoor units. In either case, conduct the diagnostic procedure described in the following pages. Operation lamp (multi-monitor lamp) (R24043) Service Monitor 2.
SiUS041829E Service Diagnosis 3. Service Diagnosis 3.1 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) < ARC466 Series > The code indication changes in the sequence shown below. ARC466A36 No. 1 2 3 4 5 6 7 8 9 10 Notes Part 6 Service Diagnosis Code 00 A5 E7 F3 F6 L3 L4 L5 U4 E6 No.
Service Diagnosis 3.2 SiUS041829E Method 2 1. Press the center of Temp button and Mode button at the same time. (R24046) 5C 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. (R24047) The left-side number blinks. (R11670) 4. Press Temp or Temp button and change the number until you hear the two consecutive beeps or the long beep. (R24048) 5. Diagnose by the sound.
SiUS041829E 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 70. 6. Press Mode button. (R24047) The right-side number blinks. (R11673) 7. Press Temp or Temp button and change the number until you hear the long beep. (R24048) 8. Diagnose by the sound. Beep: The left-side number does not correspond with the error code.
Troubleshooting SiUS041829E 4. Troubleshooting 4.
SiUS041829E 4.2 Troubleshooting Indoor Unit PCB Abnormality Error Code A1 Method of Error Detection The system checks if the circuit works properly within the microcomputer of the indoor unit. Error Decision Conditions The system cannot set the internal settings.
Troubleshooting SiUS041829E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Combination of the indoor and outdoor unit matched? NO Match the compatible models. YES Check the connection of connectors. (Refer to Note) OK? ∗ To secure the connection, disconnect the connectors once and then reconnect. YES Check the power supply voltage. NO Voltage as rated? NO Correct the power supply. YES Start operation.
SiUS041829E 4.3 Troubleshooting Freeze-up Protection Control/Heating Peak-cut Control Error Code A5 Method of Error Detection Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor.
Troubleshooting 4.4 SiUS041829E Indoor Fan Motor (DC Motor) or Related Abnormality Error Code A6 Method of Error Detection The rotation speed detected by the Hall IC during indoor fan motor operation determines abnormal fan motor operation. Error Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
SiUS041829E Troubleshooting Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation within ±10% from the rated value? NO Correct the power supply. YES Turn off the power and rotate the fan by hand. Does the fan rotate smoothly? NO Replace the indoor fan motor. YES Turn on the power and start operation.
Troubleshooting Note Reference 76 SiUS041829E The rotation pulse is the feedback signal from the indoor fan motor. Check No.02 Refer to P.
SiUS041829E 4.5 Troubleshooting Thermistor or Related Abnormality C4, C9 Error Code Method of Error Detection The temperatures detected by the thermistors determine thermistor errors. Error Decision Conditions The voltage between the both ends of the thermistor is either 4.96 V or more, or 0.04 V or less with the power on.
Troubleshooting 4.6 SiUS041829E Front Panel Open/Close Fault C7 Error Code Error Decision Conditions If the error repeats, the system is shut down. Supposed Causes Defective reduction motor Malfunction or deterioration of the front panel mechanism Defective limit switch Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Restart and check the movement.
SiUS041829E 4.7 Troubleshooting Low-voltage Detection or Over-voltage Detection Error Code U2 Method of Error Detection Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit. Error Decision Conditions Low-voltage detection: The voltage detected by the DC voltage detection circuit is below 180 ~ 196 V (depending on the model).
Troubleshooting SiUS041829E Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation within ±10% from the rated value? NO Correct the power supply. YES Check the connection of the compressor harness. Loose or disconnected? YES Reconnect the harness. NO Does the outdoor fan rotate smoothly? NO Replace the outdoor fan motor and the outdoor unit PCB (main PCB).
SiUS041829E 4.8 Troubleshooting Signal Transmission Error (Between Indoor Unit and Outdoor Unit) Error Code U4 Method of Error Detection The signal transmission data received from the outdoor unit is checked whether it is normal. Error Decision Conditions The data sent from the outdoor unit cannot be received normally, or the content of the data is abnormal.
Troubleshooting SiUS041829E Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation within ±10% from the rated value? NO Correct the power supply. YES Check the indoor unit - outdoor unit connection wires. Is there any wiring error? YES Correct the indoor unit outdoor unit connection wires.
SiUS041829E 4.9 Troubleshooting Unspecified Voltage (Between Indoor Unit and Outdoor Unit) Error Code UA Method of Error Detection The supply power is detected for its requirements (pair type is different from multi type) by the indoor/outdoor transmission signal. Error Decision Conditions The pair type and multi type are interconnected.
Troubleshooting SiUS041829E 4.10 Outdoor Unit PCB Abnormality Error Code E1 Method of Error Detection The system checks if the microprocessor is working in order. The system checks if the zero-cross signal comes in properly. Error Decision Conditions The microprocessor program runs out of control. The zero-cross signal is not detected.
SiUS041829E Troubleshooting 4.11 OL Activation (Compressor Overload) Error Code E5 Method of Error Detection A compressor overload is detected through compressor OL. Error Decision Conditions If the error repeats, the system is shut down.
Troubleshooting SiUS041829E Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Discharge pipe thermistor disconnected? YES Insert the thermistor in position. NO Check No. 01 Check the discharge pipe thermistor. NG Replace the discharge pipe thermistor. OK Is the connector S40 properly connected? NO Connect the connector S40 properly. YES Disconnect the connector S40 from the PCB.
SiUS041829E Troubleshooting Reference Note Part 6 Service Diagnosis Check No.14 Refer to P.115 When replacing the defective thermistor(s), replace the thermistor as ASSY.
Troubleshooting SiUS041829E 4.12 Compressor Lock Error Code E6 Method of Error Detection A compressor lock is detected by the current waveform generated when applying high-frequency voltage to the motor. Error Decision Conditions If the error repeats, the system is shut down.
SiUS041829E Troubleshooting Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting 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 closed? YES Open the stop valve. NO Turn off the power. Disconnect the harnesses U, V, and W. Check No.15 Check with the inverter analyzer.
Troubleshooting SiUS041829E 4.13 DC Fan Lock Error Code E7 Method of Error Detection An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Error Decision Conditions The fan does not start in 15 ~ 30 seconds even when the fan motor is running. If the error repeats, the system is shut down.
SiUS041829E Troubleshooting 4.14 Input Overcurrent Detection Error Code E8 Method of Error Detection An input overcurrent is detected by checking the input current value with the compressor running. Error Decision Conditions The current exceeds about 12.0 ~ 12.5 A (depending on the model) for 2.5 seconds with the compressor running. The upper limit of the current decreases when the outdoor temperature exceeds a certain level.
Troubleshooting SiUS041829E Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting 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 Check No. 17 Check the installation condition. Start operation and measure the input current.
SiUS041829E Troubleshooting 4.15 Four Way Valve Abnormality Error Code EA Method of Error Detection The room temperature thermistor and the indoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Error Decision Conditions The following condition continues over 10 minutes after operating for 5 minutes.
Troubleshooting SiUS041829E Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Four way valve coil disconnected (loose)? YES Correct the four way valve coil. NO Harness disconnected? YES Reconnect the harness. NO Check the continuity of the four way valve coil and harness. Disconnect the harness from the connector. Resistance between harnesses about 1000 ~ 2000 Ω? NO Replace the four way valve coil. YES Check No.
SiUS041829E Troubleshooting 4.16 Discharge Pipe Temperature Control F3 Error Code Method of Error Detection An error is determined with the temperature detected by the discharge pipe thermistor. Error Decision Conditions If the temperature detected by the discharge pipe thermistor rises above A, the compressor stops. The error is cleared when the discharge pipe temperature has dropped below B. If the error repeats, the system is shut down.
Troubleshooting SiUS041829E 4.17 High Pressure Control in Cooling Error Code F6 Method of Error Detection 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. Error Decision Conditions The temperature sensed by the outdoor heat exchanger thermistor rises above 57.5 ~ 60°C (135.5 ~ 140°F) (depending on the model).
SiUS041829E Troubleshooting Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the installation space. Check No. 17 Check the installation condition. NG OK Check No. 19 Check the outdoor fan. NG OK Check No. 18 Check the discharge pressure. NG Change the installation location or direction. Clean the outdoor heat exchanger. Replace the outdoor fan motor. Reconnect the connector or fan motor lead wires.
Troubleshooting SiUS041829E 4.18 System Shutdown due to Temperature Abnormality in Compressor Error Code F8 Method of Error Detection Operation is halted when the temperature detected by the discharge pipe thermistor exceeds the determined limit. Error Decision Conditions Temperature exceeds the detection threshold of 127.5°C (261.5°F) during forced cooling operation.
SiUS041829E Troubleshooting 4.19 Compressor System Sensor Abnormality Error Code H0 Method of Error Detection The system checks the DC current before the compressor starts. Error Decision Conditions The voltage converted from the DC current before compressor start-up is out of the range 0.5 ~ 4.5 V. The DC voltage before compressor start-up is below 50 V.
Troubleshooting SiUS041829E 4.20 Position Sensor Abnormality Error Code H6 Method of Error Detection A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Error Decision Conditions If the error repeats, the system is shut down.
SiUS041829E Troubleshooting Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Is the power supply voltage fluctuation within ±10% from the rated value? NO Correct the power supply. YES Check No. 18 Check the discharge pressure. OK? NO Replace the stop valve. YES Check No. 20 Check the short circuit of the diode bridge.
Troubleshooting SiUS041829E R6000565 102 Reference Check No.15 Refer to P.116 Reference Check No.18 Refer to P.119 Reference Check No.20 Refer to P.
SiUS041829E Troubleshooting 4.21 DC Voltage/Current Sensor Abnormality Error Code H8 Method of Error Detection DC voltage or DC current sensor abnormality is identified based on the compressor running frequency and the input current. Error Decision Conditions If the error repeats, the system is shut down.
Troubleshooting SiUS041829E 4.22 Thermistor or Related Abnormality (Outdoor Unit) Error Code H9, J3, J6, P4 Method of Error Detection 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. Error Decision Conditions The voltage between the both ends of the thermistor is either 4.96 V or more, or 0.04 V or less with the power on.
SiUS041829E Troubleshooting Troubleshooting In case of H9, J3, J6 Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn on the power again. Error displayed again on remote controller? NO Reconnect the connectors or thermistors. YES Check No. 01 Check the thermistor resistance value. Normal? J3 error: the discharge pipe temperature is lower than the heat exchanger temperature.
Troubleshooting SiUS041829E 4.23 Electrical Box Temperature Rise Error Code L3 Method of Error Detection An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Error Decision Conditions With the compressor off, the radiation fin temperature is above A. The error is cleared when the radiation fin temperature drops below B.
SiUS041829E Troubleshooting 4.24 Radiation Fin Temperature Rise Error Code L4 Method of Error Detection A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on. Error Decision Conditions If the radiation fin temperature with the compressor on is above A. The error is cleared when the radiation fin temperature drops below B. If the error repeats, the system is shut down.
Troubleshooting SiUS041829E Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Then, turn on the power to restart the system. Error displayed again? YES NO Has the PCB been replaced? YES Check if silicone grease is applied properly on the radiation fin. If not, apply the silicone grease. NO Check the radiation fin temperature. NO Above A? Replace the outdoor unit PCB (main PCB). YES Check No.
SiUS041829E Troubleshooting 4.25 Output Overcurrent Detection Error Code L5 Method of Error Detection An output overcurrent is detected by checking the current that flows in the inverter DC section. Error Decision Conditions A position signal error occurs while the compressor is running. A rotation speed error occurs while the compressor is running. An output overcurrent signal is fed from the output overcurrent detection circuit to the microcomputer.
Troubleshooting SiUS041829E Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting 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. Check No. 17 Check the installation condition. Stop valve fully open? NO Fully open the stop valve. YES Turn off the power.
SiUS041829E Troubleshooting Reference Check No.15 Refer to P.116 Reference Check No.17 Refer to P.118 Reference Check No.18 Refer to P.119 Reference Check No.22 Refer to P.
Check SiUS041829E 5. Check 5.1 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. Disconnect the connector of thermistor ASSY from the PCB to measure the resistance between the pins using multimeter.
SiUS041829E 5.2 Check Indoor Fan Motor Connector Check Check No.02 1. 2. 3. 4. 5. Check the connection of connector. Check motor power supply voltage output (pins 4 - 7). Check motor control voltage (pins 4 - 3). Check rotation command voltage output (pins 4 - 2). Check rotation pulse input (pins 4 - 1). S200 7 6 5 4 3 2 1 5.
Check 5.4 SiUS041829E Electronic Expansion Valve Check Check No.12 Conduct the following to check the electronic expansion valve (EV). 1. Check if the EV connector is correctly connected to the PCB. 2. Turn the power off and on again, and check if the EV generates a latching sound. 3. If the EV does not generate a latching sound in step 2, disconnect the connector and check the continuity using a multimeter. 4.
SiUS041829E 5.5 Check Four Way Valve Performance Check Check No.13 Turn off the power. Then, turn on the power to restart the system. Start heating operation. S80 voltage at 208 - 230 VAC with compressor on? (Fig. 1) ∗ Four way valve coil Cooling/Dry/Defrost: Not energized Heating: energized NO Replace the outdoor unit PCB (main PCB). YES Disconnect the four way valve coil from the connector and check the continuity.
Check 5.7 SiUS041829E 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.). The inverter analyzer makes it possible to judge the cause of trouble easily and securely.
SiUS041829E Check Diagnose method (Diagnose according to 6 LEDs lighting status of the inverter analyzer.) 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, the power module is defective. Replace the main PCB. The power module is united with the main PCB. If OK in Check No.22, check if there is any solder cracking on the PCB. 4.
Check 5.9 SiUS041829E Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air suction and discharge area. NG Change the installation location or direction. OK Is the discharged air short-circuited? YES Change the installation location or direction. NO Is the outdoor heat exchanger very dirty? YES Clean the outdoor heat exchanger.
SiUS041829E Check 5.10 Discharge Pressure Check Check No.18 Discharge pressure check High? NO Replace the compressor. YES Is the stop valve open? NO Open the stop valve. YES Is the connection pipe deformed? YES Replace the pipe installed at the site. NO Is the air filter or indoor/outdoor heat exchanger dirty? NO Replace the compressor. YES Clean the dirty air filter or indoor/outdoor heat exchanger. (R21121) 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system.
Check SiUS041829E 5.12 Main Circuit Short Check Check No.20 Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is about 0 V before checking Measure the resistance between the pins of the DB1 referring to the table below. If the resistance is or less than 1 k, short circuit occurs on the main circuit. Positive terminal (+) of digital multimeter Negative terminal (–) of digital multimeter Resistance is OK. Resistance is NG.
SiUS041829E Check – + Multimeter – ~ ~ + 18 class 4 3 2 1 (R25105) Part 6 Service Diagnosis 121
Check SiUS041829E 5.13 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. Follow the procedure below to measure resistance between the terminals of the power module and the terminals of the compressor with a multimeter.
SiUS041829E Check 18 class W V U DC_P1: + DC_N1: – Part 6 Service Diagnosis (R20704) 123
SiUS041829E Part 7 Trial Operation and Field Settings 1. 2. 3. 4. Pump Down Operation............................................................................125 Forced Cooling Operation .......................................................................126 Trial Operation ........................................................................................127 Field Settings ..........................................................................................129 4.1 4.2 4.3 4.
SiUS041829E Pump Down Operation 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit. Details 1. 2. 3. 4. 5. Remove the valve caps from the liquid stop valve and the gas stop valve. Carry out forced cooling operation. After 5 - 10 minutes, close the liquid stop valve with a hexagonal wrench. After 2 - 3 minutes, close the gas stop valve and stop the forced cooling operation.
Forced Cooling Operation SiUS041829E 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. Details With indoor unit ON/OFF switch Press indoor unit ON/OFF switch for at least 5 seconds. The operation will start.
SiUS041829E Trial Operation 3. Trial Operation Outline Trial operation should be carried out in either cooling or heating operation. 1. Measure the supply voltage and make sure that it is within the specified range. 2. In cooling operation, select the lowest programmable temperature; in heating operation, select the highest programmable temperature. 3.
Trial Operation SiUS041829E Indoor or outdoor unit’s air inlet or air outlet. Stop valves are opened. Indoor unit properly receives remote controller commands. will be displayed when the Mode button is pressed.* Pipes and wires are connected to the corresponding terminal blocks / connection ports for the connected unit. Note(s) Incomplete cooling/heating function Incomplete cooling/heating function No operation No heating No cooling/heating * Check that the jumper (J8) has not been cut.
SiUS041829E Field Settings 4. Field Settings 4.1 Temperature Display Switch Procedure Press the upper side of Temp button and On button at the same time for 5 seconds to change the unit of temperature display. (R22009) 4.2 When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different address. Both the indoor unit PCB and the wireless remote controller need alteration.
Field Settings Wireless Remote Controller SiUS041829E 1. Slide down the cover and take it off. 2. Cut the address setting jumper J4. Be careful not to cut the jumper J8. (R25252) Caution 4.3 Replace the remote controller if you cut a jumper unintentionally. Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them. Jumper and Switch Settings Jumper on indoor unit PCB JB JC Reference 130 Function Fan speed setting when compressor stops for thermostat OFF.
SiUS041829E 4.4 Field Settings Facility Setting (cooling at low outdoor temperature) Outline This function is limited only for facilities (the target of air conditioning is equipment such as computers). Never use it in a residence or office (the space where there is a human). Details Cutting jumper J6 on the outdoor unit PCB will extend the operation range to –10°C (14°F). Installing an air direction adjustment grille (sold separately) will further extend the operation range to –20°C (–4°F).
Silicone Grease on Power Transistor/Diode Bridge SiUS041829E 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. Details 1. 2. 3. 4. Wipe off the old silicone grease completely. Apply the silicone grease evenly. See the illustrations below for examples of application.
SiUS041829E Part 8 Appendix 1. Piping Diagrams......................................................................................134 1.1 Indoor Unit................................................................................................ 134 1.2 Outdoor Unit ............................................................................................. 135 2. Wiring Diagrams......................................................................................136 2.1 Indoor Unit....................
Piping Diagrams SiUS041829E 1. Piping Diagrams 1.
SiUS041829E 1.
Wiring Diagrams SiUS041829E 2. Wiring Diagrams 2.
SiUS041829E Outdoor Unit 3. Outdoor Unit RX09/12RMVJU9 3D112531A Note(s) Part 8 Appendix PCB1: Main PCB Refer to page 20 for Printed Circuit Board Connector Wiring Diagram.
Outdoor Unit SiUS041829E RX18RMVJU9 3D105962B Note(s) 138 PCB: Main PCB Refer to page 21 for Printed Circuit Board Connector Wiring Diagram.
SiUS041829E Operation Limit 4.
zz Daikin products are manufactured for export to numerous countries throughout the world. Prior to purchase, please confirm with your local authorized importer, distributor and/or retailer whether this product conforms to the applicable standards, and is suitable for use, in the region where the product will be used. This statement does not purport to exclude, restrict or modify the application of any local legislation. zz Ask a qualified installer or contractor to install this product.
