SiUS041638E Service Manual Inverter Pair Wall Mounted Type FTX-N Series [Applied Models] z Inverter Pair : Cooling Only z Inverter Pair : Heat Pump
SiUS041638E Inverter Pair Wall Mounted Type FTX-N Series zCooling Only Indoor Unit FTX30NVJU FTX36NVJU Outdoor Unit RK30NMVJU RK36NMVJU zHeat Pump Indoor Unit FTX30NVJU FTX36NVJU Outdoor Unit RX30NMVJU RX36NMVJU i Table of Contents
SiUS041638E 1. Safety Cautions........................................................................................... v 1.1 Warnings and Cautions Regarding Safety of Workers................................. v 1.2 Warnings and Cautions Regarding Safety of Users.................................... vii 2. Icons Used .................................................................................................. x Part 1 List of Functions ................................................................
SiUS041638E 3.9 3.10 3.11 3.12 Liquid Compression Protection Function.................................................... 41 Defrost Control ........................................................................................... 42 Electronic Expansion Valve Control ........................................................... 43 Malfunctions ............................................................................................... 46 Part 5 Remote Controller ......................................
SiUS041638E 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.14 Four Way Valve Performance Check ......................................................... 95 Inverter Unit Refrigerant System Check..................................................... 95 Inverter Analyzer Check ............................................................................. 96 Rotation Pulse Check on the Outdoor Unit PCB ........................................ 98 Installation Condition Check..........................................
Safety Cautions SiUS041638E 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 Pictograms 1.1 The caution items are classified into Warning and Caution.
SiUS041638E Safety Cautions 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). Insufficient safety measures may cause a fall.
Safety Cautions SiUS041638E 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 a 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.
SiUS041638E Safety Cautions Warning When wiring between the indoor and outdoor units, make sure that the terminal cover does not lift off or dismount because of the cable. If the cover is not mounted properly, the terminal connection section may cause an electrical shock, excessive heat generation or fire. Do not damage or modify the power cable. Damaged or modified power cables may cause an electrical shock or fire.
Safety Cautions SiUS041638E Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks. If combustible gas leaks and remains around the unit, it may cause a fire. Check to see if parts and wires are mounted and connected properly, and if connections at the soldered or crimped terminals are secure.
SiUS041638E Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Information Warning Description Caution A 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. Note A Note provides information that is not indispensable, but may nevertheless be valuable to the reader, such as tips and tricks.
SiUS041638E Part 1 List of Functions 1. Functions.....................................................................................................
SiUS041638E Functions Comfortable Airflow Comfort Control Operation Lifestyle Convenience z z Refer to P.
SiUS041638E Part 2 Specifications 1. Specifications ..............................................................................................4 1.1 Cooling Only................................................................................................. 4 1.2 Heat Pump ...................................................................................................
SiUS041638E Specifications 1. Specifications 1.1 Cooling Only 60 Hz, 208 - 230 V Indoor Unit Outdoor Unit Rated Capacity Min. ~ Max. Running Current (Rated) Rated Power Consumption Min. ~ Max. Power Factor (Rated) COP (Rated) EER (Rated) SEER / HSPF Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max.
Specifications 1.2 SiUS041638E Heat Pump 60 Hz, 208 - 230V Indoor Unit Model Outdoor Unit Capacity Rated Btu/h Min. ~ Max. Btu/h Running Current (Rated) Power Consumption Rated Min. ~ Max. Power Factor (Rated) COP (Rated) EER (Rated) SEER / HSPF Piping Connections Liquid Gas Drain in. (mm) in. (mm) in. (mm) Heat Insulation Max. Interunit Piping Length Max.
SiUS041638E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit...................................................................................................7 1.1 FTX30/36NVJU ............................................................................................ 7 2. Outdoor Unit................................................................................................ 9 2.1 RK(X)30/36NMVJU ...................................................................................
Indoor Unit SiUS041638E 1. Indoor Unit 1.
SiUS041638E Indoor Unit Signal Receiver PCB (PCB2) 1) S48 Connector for control PCB (PCB1) S48 3P224121-1 Display PCB (PCB3) 1) 2) 3) 4) 5) 6) S49 SW1 LED1 (H1P) LED2 (H2P) LED3 (H3P) RTH1 (R1T) Connector for control PCB (PCB1) Indoor unit ON/OFF button LED for operation (green) LED for timer (yellow) LED for INTELLIGENT EYE (green) Room temperature thermistor RTH1 SW1 LED3 S49 INTELLIGENT EYE Sensor PCB (PCB4) 1) S36 LED2 LED1 3P224121-1 Connector for control PCB (PCB1) S36 3P227885-1 N
Outdoor Unit SiUS041638E 2. Outdoor Unit 2.
SiUS041638E Outdoor Unit E1, E2 HN1 HL1 CK1 V401 FU1 V3 V2 FU3 S S20 S201 U, V, W S80 S70 FU2 S40 S202 Printed Circuit Board Connector Wiring Diagram S90 2P455785-13 10
Outdoor Unit Service Monitor PCB (PCB2) SiUS041638E 1) S501, S502 2) LED A 3) SW5-3 4) SW6-2 Connector for main PCB (PCB1) LED for service monitor (green) Switch for facility setting ∗ Refer to page 109 for details. Switch for facility setting ∗ Refer to page 109 for details. LED A SW5-3 SW6-2 S501 S502 3P346711-10 SW1 ~ SW4 and LED1 ~ LED5 do not work.
SiUS041638E Part 4 Functions and Control 1. Main Functions..........................................................................................13 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 Temperature Control .................................................................................. 13 Frequency Principle.................................................................................... 13 Airflow Direction Control............................................................
Main Functions SiUS041638E 1. Main Functions 1.1 Temperature Control Definitions of Temperatures The definitions of temperatures are classified as following.
SiUS041638E Main Functions The following drawing shows a schematic view of the inverter principle: Refrigerant circulation rate (high) DC power Amount of heat exchanged air (small) high speed AC power Amount of heat exchanged air (large) high f low f low speed 50 Hz freq= constant 60 Hz freq=variable Amount of heat exchanged air (large) Amount of heat exchanged air (small) capacity= variable Refrigerant circulation rate (low) (R2812) Inverter Features The inverter provides the following featur
Main Functions 1.3 SiUS041638E 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.
SiUS041638E 1.4 Main Functions 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.
Main Functions 1.5 SiUS041638E 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.
SiUS041638E 1.6 Main Functions Automatic Operation Outline Details Automatic Cooling/Heating Function When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
Main Functions 1.7 Outline Details SiUS041638E Thermostat Control Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON 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.
SiUS041638E 1.8 Main Functions 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 it slightly in the case of heating.
Main Functions SiUS041638E 1.10 INTELLIGENT EYE Operation 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. Details 1. INTELLIGENT EYE detection method Sampling (20 msec.) Motion sensor output 1 sec. High Low Human motion (Condition of 10 times or more output) If the motion sensor detects the outputs 10 times/sec.
SiUS041638E Main Functions 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. Operation mode Fan speed Target temperature COOL DRY H tap + A rpm Dry rotating speed + A rpm 18°C (64.4°F) Lowered by 2.5°C (4.
Main Functions SiUS041638E 1.12 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press Clock button. → is displayed and 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 displayed time. 5. Press Clock button.
SiUS041638E Main Functions 1.13 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 SiUS041638E 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.
SiUS041638E 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 SiUS041638E 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 ON 8:30 17:30 77˚F (25˚C) 6:00 program 4 OFF 81˚F (27˚C) 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.
SiUS041638E 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 SiUS041638E 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.
SiUS041638E Main Functions 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. Note: The cold air blast is prevented using similar control when defrost control starts or when the thermostat is turned ON. 1.14.
Thermistor Functions SiUS041638E 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 (1) Discharge Pipe Thermistor (R23851) The discharge pipe thermistor is used for controlling discharge pipe temperature.
SiUS041638E Thermistor Functions The conditions are Tc ≤ – 1° C Ta – Tc ≥ 10° C where Ta is the room temperature and Tc is the indoor heat exchanger temperature. In heating operation, the indoor heat exchanger thermistor is used for heating peak-cut control. If the indoor heat exchanger temperature rises abnormally, the operating frequency becomes lower or the operation halts.
Control Specification SiUS041638E 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.
SiUS041638E 3.2 Control Specification 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 (∆F<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
Control Specification SiUS041638E 2. Determine upper limit frequency The minimum value is set as an upper limit frequency among the frequency upper limits of the following functions: Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze-up protection, defrost control. 3.
SiUS041638E 3.3 Control Specification Controls at Mode Changing/Start-up 3.3.1 Preheating Operation Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the preheating command from the indoor unit. Details ON Condition When the outdoor temperature is below 6°C (42.8°F), the inverter operation in open phase starts. OFF Condition When the outdoor temperature is higher than 8°C (46.4°F), the inverter operation in open phase stops. 3.3.
Control Specification SiUS041638E 3.3.4 3-Minute Standby Turning on the compressor is prohibited for 3 minutes after turning it off. (The function is not activated when defrosting.) 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not activated when defrosting.) (Hz) Frequency C B A D E (sec.
SiUS041638E 3.4 Control Specification Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the internal temperature of the compressor. If the discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep the discharge pipe temperature from rising further. Details Stop zone A B Dropping zone C Keep zone D Discharge pipe temperature Up zone Reset zone E (R14722) RK(X)30/36NMVJU (°C) (°F) A B 120 111 248.0 231.
Control Specification 3.5 Outline SiUS041638E 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 frequency and takes priority over the lower limit control of four way valve operation compensation.
SiUS041638E 3.6 Control Specification Freeze-up Protection Control During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) The operating frequency limitation is judged with the indoor heat exchanger temperature. Indoor heat exchanger temperature (R2T) 13˚C (55.4˚F) 7˚C (44.6˚F) Reset zone 5˚C (41.0˚F) Up zone 3˚C (37.4˚F) Keep zone 0˚C (32.
Control Specification 3.8 SiUS041638E 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 during defrosting. 3. Fan OFF delay when stopped The outdoor fan is turned OFF 60 seconds after the compressor stops. 4.
SiUS041638E Control Specification 3.10 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish 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.
Control Specification SiUS041638E 3.11 Electronic Expansion Valve Control During defrost control Frequency change under discharge pipe thermistor disconnection control Operation start Control Power on ; Compressor stop Status Discharge pipe thermistor disconnection The following are examples of electronic expansion valve control for each operation mode.
SiUS041638E Control Specification 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 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 the pressure is equalized. 3.11.
Control Specification Details SiUS041638E Determining thermistor disconnection When the starting control (Cooling: A seconds, Heating: B seconds) finishes, the detection timer for disconnection of the discharge pipe thermistor (C seconds) starts. When the timer is over, the following adjustment is made. 1. When the operation mode is cooling When the following condition is fulfilled, the discharge pipe thermistor disconnection is ascertained. Discharge pipe temperature +6°C (+10.
SiUS041638E Control Specification 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction can be detected in the following thermistors: 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Outdoor temperature thermistor 3.12.2 Detection of Overcurrent and Overload Outline An excessive output current is detected and the OL temperature is observed to protect the compressor.
SiUS041638E Part 5 Remote Controller 1. Remote Controller .....................................................................................
SiUS041638E Remote Controller 1. Remote Controller Signal transmitter Display (LCD) • Displays the current settings. (In this illustration, each section is shown with all its displays on for the purpose of explanation.) Receiver Temperature adjustment buttons • To use the remote controller, aim the transmitter at the indoor unit. If there is anything blocking the signals between the unit and the remote controller, such as a curtain, the unit may not operate.
Remote Controller SiUS041638E Open the Front Cover Mode button • Selects the operation mode. AUTO (heat pump only) DRY COOL HEAT (heat pump only) FAN Econo4 / Quiet button • Every time you press Econo/Quiet button, the setting changes in the following order. ECONO Comfort/Sensor button (COMFORT AIRFLOW Operation2/ INTELLIGENT EYE Operation3) Blank No setting Combination • OUTDOOR UNIT QUIET operation is not available in FAN and DRY operation.
SiUS041638E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items .........................................52 2. Troubleshooting with LED .........................................................................53 2.1 Indoor Unit.................................................................................................. 53 2.2 Outdoor Unit ............................................................................................... 53 3. Service Diagnosis ...........................
SiUS041638E 5.9 5.10 5.11 5.12 5.13 5.14 51 Installation Condition Check....................................................................... 99 Discharge Pressure Check......................................................................... 99 Outdoor Fan System Check ..................................................................... 100 Main Circuit Short Check.......................................................................... 100 Capacitor Voltage Check....................................
SiUS041638E 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 the type of the indoor unit. Check the outdoor temperature. Diagnose with remote controller indication. Check the remote controller addresses. Operation sometimes stops. Details Check if the rated voltage is supplied. Check if the indoor unit type is compatible with the outdoor unit.
Troubleshooting with LED SiUS041638E 2. Troubleshooting with LED 2.1 Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. A protection device of the indoor or outdoor unit is activated, or the thermistor malfunctions. 2. 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 (green) (R24553) 2.
SiUS041638E Service Diagnosis 3. Service Diagnosis 1. When Timer Cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen. Method 1 Timer Cancel button < ARC466 Series > (R24532) 2. Press Timer Cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below. ARC466A37 Notes: Service Diagnosis No. 1 Code 00 No. 14 Code U0 No.
Service Diagnosis SiUS041638E Method 2 1. Press the center of Temp button and Mode button at the same time. (R24533) 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. (R24534) The left-side number blinks. (R11670) 4. Press Temp or Temp beeps or the long beep.
SiUS041638E 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 rightside 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. Refer to page 57. 6. Press Mode button. (R24534) The right-side number blinks. (R11673) 7.
Troubleshooting SiUS041638E 4. Troubleshooting 4.
SiUS041638E 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 SiUS041638E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the combination of the indoor and outdoor unit. OK? NO Match the compatible models. YES ∗ To secure the connection, disconnect the connectors once and then reconnect. Check the connection of connectors. (Refer to Note) OK? YES Check the power supply voltage. NO Voltage as rated? NO Correct the power supply. YES Start operation.
SiUS041638E 4.3 Troubleshooting Freeze-up Protection Control/Heating Peak-cut Control Error Code A5 Method of Error Detection Freeze-up protection control Error Decision Conditions 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 SiUS041638E Indoor Fan Motor (DC Motor) or Related Abnormality Error Code A6 Method of Error Detection The rotation speed detected by the Hall IC during fan motor operation is used to determine 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.
SiUS041638E Troubleshooting Troubleshooting Caution Check No.02 Refer to P.93 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 4.5 SiUS041638E Thermistor or Related Abnormality (Indoor Unit) 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 during compressor operation. Supposed Causes Disconnection of connector Defective thermistor(s) Defective indoor unit PCB Troubleshooting Caution Check No.01 Refer to P.
SiUS041638E 4.6 Troubleshooting Low-voltage Detection or Over-voltage Detection Error Code U2 Indoor Unit Method of Error 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. Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit.
Troubleshooting SiUS041638E 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).
SiUS041638E 4.7 Troubleshooting Signal Transmission Error (between Indoor Unit and Outdoor Unit) Error Code U4 Method of Error Detection The signal transmission data 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 SiUS041638E Troubleshooting Caution Check No.11 Refer to P.93 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 wires between the indoor unit and the outdoor unit. Is there any wiring error? YES NO Correct the connection wires between the indoor unit and the outdoor unit.
SiUS041638E 4.8 Troubleshooting Signal Transmission Error on Outdoor Unit PCB Error Code U7 Method of Error Detection Communication error between microcomputer mounted on the main microcomputer and PM1. Error Decision Conditions The abnormality is determined when the data sent from the PM1 can not be received for 9 seconds. The error counter is reset when the data from the PM1 can be successfully received.
Troubleshooting 4.9 SiUS041638E Mismatching of Indoor Unit and Outdoor Unit Error Code UA Method of Error Detection Detection from the signal transmission signal between indoor/outdoor units. Error Decision Conditions Improper combination of indoor and outdoor units.
SiUS041638E Troubleshooting 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.
Troubleshooting SiUS041638E 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.
SiUS041638E Troubleshooting Troubleshooting Caution Check No.01 Refer to P.92 Check No.12 Refer to P.94 Check No.13 Refer to P.95 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Discharge pipe thermistor disconnected? 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? Check No.14 Refer to P.
Troubleshooting SiUS041638E 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. Reset condition: Continuous run for about 11 minutes without any other error Supposed Causes Closed stop valve Compressor locked Disconnection of compressor harness Troubleshooting Caution Check No.12 Refer to P.
SiUS041638E Troubleshooting 4.13 DC Fan Lock (Outdoor Fan) 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.
Troubleshooting SiUS041638E 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 20 A for 2.5 seconds with the compressor running. (The upper limit of the current decreases when the outdoor temperature exceeds a certain level.) Supposed Causes Outdoor temperature is out of operation range.
SiUS041638E 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 Cooling/Dry The following condition continues over 10 minutes after operating for 5 minutes.
Troubleshooting SiUS041638E Troubleshooting Caution Check No.01 Refer to P.92 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 Check No.13 Refer to P.95 Harness disconnected? YES Reconnect the harness. NO Check No.14 Refer to P.95 Check the continuity of the four way valve coil and harness. Disconnect the harness from the connector.
SiUS041638E Troubleshooting 4.16 Discharge Pipe Temperature Control Error Code F3 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. RK(X)30/36NMVJU A B °C °F °C °F 120 248 107 224.
Troubleshooting SiUS041638E 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 rise above 60°C (140°F). The error is cleared when the temperature drops below 47°C (116.6°F).
SiUS041638E Troubleshooting 4.18 System Shutdown due to Compressor Internal Temperature Abnormality 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 during forced cooling operation.
Troubleshooting SiUS041638E 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.
SiUS041638E Troubleshooting 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.
Troubleshooting SiUS041638E Troubleshooting Caution Check No.15 Refer to P.96 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. Check No.18 Refer to P.99 Voltage as rated? Check No.20 Refer to P.100 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.
SiUS041638E Troubleshooting 4.21 CT or Related Abnormality Remote Controller Display H8 Method of Malfunction Detection A CT or related error is detected by checking the compressor running frequency and CT-detected input current. Malfunction Decision Conditions The compressor running frequency is more than A Hz, and the CT input current is less than B A. A (Hz) 32 B (A) 0.5 If the error repeats, the system is shut down.
Troubleshooting SiUS041638E Troubleshooting Check No.15 Refer to P.96 Check No.21 Refer to P.101 Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power and turn it on again. Start operation. ∗ Running current as shown at right with relay cable 1 or 2? YES Current (guideline) Replace the outdoor unit PCB.
SiUS041638E Troubleshooting 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.
Troubleshooting Troubleshooting SiUS041638E In case of H9, J3, J6 Caution Check No.01 Refer to P.92 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.
SiUS041638E Troubleshooting 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.
Troubleshooting SiUS041638E 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.
SiUS041638E 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 SiUS041638E Troubleshooting Caution Check No.15 Refer to P.96 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. Check No.17 Refer to P.
SiUS041638E Check 5. Check 5.1 Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using a multimeter. Thermistor temperature Resistance (kΩ) °C °F –20 –4 197.8 –15 5 148.2 –10 14 112.1 –5 23 85.60 0 32 65.93 5 41 51.14 10 50 39.99 15 59 31.52 20 68 25.02 25 77 20.00 30 86 16.10 35 95 13.04 40 104 10.62 45 113 8.707 50 122 7.
Check 5.2 SiUS041638E Indoor Fan Motor Connector Output Check Check No.02 1. 2. 3. 4. 5. Check the connection of connector. Check the motor power supply voltage output (pins 4 - 7). Check the motor control voltage (pins 4 - 3). Check the rotation command voltage (pins 4 - 2). Check the rotation pulse (pins 4 - 1). S1 7 6 5 4 3 2 1 Motor power supply voltage (310 ~ 340 VDC) Unused Unused GND Motor control voltage (15 VDC) Rotation command voltage (1~ 6.5 VDC) Rotation pulse input (R19654) 5.
SiUS041638E 5.4 Check 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 to see if the EV generates a latching sound. 3. If the EV does not generate a latching sound in the above step 2, disconnect the connector and check the continuity using a multimeter. 4. Check the continuity between the pins 5 - 1, 5 - 2, 5 - 3, 5 - 4.
Check 5.5 SiUS041638E Four Way Valve Performance Check Check No.13 Turn the power off and then on again. 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. Four way valve coil resistance at 1000 ~ 2000 Ω? NO Replace the four way valve coil.
SiUS041638E 5.7 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.). The inverter analyzer makes it possible to judge the cause of trouble easily and securely.
Check SiUS041638E Step 3 Activate power transistor test operation from the indoor unit. (1) Turn the power on. (2) Select FAN operation with the Mode button on the remote controller. (3) Press the center of the Temp button and the Mode button at the same time. (4) Select T with the Temp or Temp button. (5) Press the Mode button to start the power transistor test operation. (R24537) Diagnose method (Diagnose according to 6 LEDs lighting status of inverter analyzer.
SiUS041638E 5.8 Check Rotation Pulse Check on the Outdoor Unit PCB Check No.16 Make sure that the voltage of 320 + 100 V ~ 320 - 50 V is applied. 1. Set operation off and power off. Disconnect the connector S70 or S71. 2. Check that the voltage between the pins 4 - 7 is 320 VDC. 3. Check that the control voltage between the pins 4 - 3 is 15 VDC. 4. Check that the rotation command voltage between the pins 4 - 2 is 0 ~ 6.5 VDC. 5. Keep operation off and power off. Connect the connector S70 or S71. 6.
Check 5.9 SiUS041638E 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.
SiUS041638E Check 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Is the outdoor fan running? NO YES Fan motor lead wire connector disconnected? NO Go to Check No. 16. YES Reconnect the connector. Outdoor fan system is functioning. (R21195) 5.12 Main Circuit Short Check Check No.20 Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approximately 0 V before checking.
Check SiUS041638E 5.13 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. voltage range) (R21938) To prevent an electrical shock, use a multimeter to check that the voltage between FU2 and DC– is 50 V or less. The surface of the test points (DC–) may be covered with the coating.
SiUS041638E Check RK(X)30/36NMVJU DC– DC+ U Service Diagnosis V W (R24539) 102
SiUS041638E Part 7 Trial Operation and Field Settings 1. 2. 3. 4. Pump Down Operation............................................................................104 Forced Cooling Operation .......................................................................105 Trial Operation ........................................................................................ 106 Field Settings ..........................................................................................107 4.1 4.2 4.3 4.
SiUS041638E 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 to 10 minutes, close the liquid stop valve with a hexagonal wrench. After 2 to 3 minutes, close the gas stop valve and stop the forced cooling operation.
Forced Cooling Operation SiUS041638E 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. Procedure With the indoor unit ON/OFF button Press the indoor unit ON/OFF button for at least 5 seconds. (The operation will start.
SiUS041638E Trial Operation 3. Trial Operation Outline 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. Carry out the trial operation following the instructions in the operation manual to ensure that all functions and parts, such as the movement of the flaps, are working properly.
Field Settings SiUS041638E 4. Field Settings 4.1 Model Type Setting (1) Turn on all the fluorescent lamps in the room, if any, and find a location where the remote controller signals are properly received by the indoor unit (within 23ft (7m)). (2) Configure according to the type of unit (heat pump or cooling only). The default setting is heat pump. For heat pump (outdoor unit model: RX) No change to jumper setting is required.
SiUS041638E 4.3 Field Settings When 2 Units are Installed in 1 Room 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 addresses. Both the indoor unit PCB and the wireless remote controller need alteration. Indoor Unit PCB Cut the address setting jumper JA on the control PCB.
Field Settings 4.4 SiUS041638E Facility Setting Switch (cooling at low outdoor temperature) Outline This function is designed for facilities such as equipment or computer rooms. It is never to be used in a residence or office where people occupy the space. Details (1) Turning on SW5-3 on the 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).
SiUS041638E Caution Field Settings If the outdoor unit is installed where the outdoor heat exchanger of the unit is exposed to direct wind, provide a windbreak wall. Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off when using facility settings. Do not place humidifiers or other items which might raise the humidity in rooms where facility settings are being used. A humidifier might cause dew jumping from the indoor unit outlet vent.
Silicone Grease on Power Transistor/Diode Bridge SiUS041638E 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.
SiUS041638E Part 8 Appendix 1. Piping Diagrams......................................................................................113 1.1 Indoor unit ................................................................................................ 113 1.2 Outdoor Unit ............................................................................................. 114 2. Wiring Diagrams......................................................................................115 2.1 Indoor Unit...................
Piping Diagrams SiUS041638E 1. Piping Diagrams 1.1 Indoor unit FTX30/36NVJU INDOOR UNIT 5/16 CuT DISTRIBUTOR HEAT EXCHANGER FIELD PIPING 1/4 CuT CROSS FLOW FAN THERMISTOR ON HEAT EXCH.
SiUS041638E 1.2 Piping Diagrams Outdoor Unit 1.2.
Wiring Diagrams SiUS041638E 2. Wiring Diagrams 2.1 Indoor Unit FTX30/36NVJU WIRING DIAGRAM 1 PCB3 S49 1 LED1 H1P LED2 H2P LED3 H3P 9 S46 1 BLK BLK BLK BLK BLK BLK BLK BLK BLK PCB1 H1 3.15A ~ C102 V1 - MR10 H2 FU2 F2U HA RED 3 OUTDOOR CAUTION 7 S1 3.
SiUS041638E 2.2 Wiring Diagrams Outdoor Unit RK(X)30/36NMVJU WIRING DIAGRAM 1 FU3 HL1 30A V2 3 S80 MRM20 MRM10 FU1 3.15A 1 V401 PS FU2 3.
Operation Limit SiUS041638E 3. Operation Limit RK30/36NMVJU Cooling 122 114.8 68 Pull-down period Outdoor temp. (˚FDB) 86 Continuous operation 104 50 *NOTE 2 32 14 50 57.2 68 73.4 82.4 86 Indoor temp. (˚FWB) Notes: 1. The graphs are based on the following conditions. • Equivalent piping length 25ft • Level difference 0ft • Airflow rate High 2.
Revision History Month / Year Version 03 / 2017 SiUS041638E Revised contents First edition
Warning z 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. z Ask a qualified installer or contractor to install this product.
