Page 1 SiENBE04-925_A Service Manual Inverter Pair Wall Mounted Type G-Series [Applied Models] z Inverter Pair: Heat Pump...
Page 2 SiENBE04-925_A Service Manual Inverter Pair Wall Mounted Type G-Series [Applied Models] z Inverter Pair: Heat Pump...
Page 3 SiENBE04-925_A Inverter Pair Wall Mounted Type G-Series zHeat Pump Indoor Units FTXL20G2V1B FTXL25G2V1B FTXL35G2V1B Outdoor Units RXL20G2V1B RXL20G2V1B9 RXL25G2V1B RXL35G2V1B Table of Contents...
Page 4: Table Of Contents
SiENBE04-925_A 1. Introduction ................... vii 1.1 Safety Cautions ..................vii 1.2 Used Icons ....................xi Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............3 1. Specifications ..................4 Part 3 Printed Circuit Board Connector Wiring Diagram ..... 7 1.
Page 5 SiENBE04-925_A 2.1 Auto Dry Cool Heat Fan Operation ............52 2.2 Adjusting the Airflow Direction..............54 2.3 COMFORT AIRFLOW and INTELLIGENT EYE Operation....56 2.4 POWERFUL Operation ................59 2.5 OUTDOOR UNIT QUIET Operation............60 2.6 ECONO Operation .................61 2.7 TIMER Operation ...................62 2.8 WEEKLY TIMER Operation ..............64 Part 6 Service Diagnosis.............
Page 6 SiENBE04-925_A 1.3 Removal of Front Grille ................132 1.4 Removal of Horizontal Blades / Vertical Blades ........135 1.5 Removal of Electrical Box ..............138 1.6 Removal of PCB...................141 1.7 Removal of Indoor Heat Exchanger .............146 1.8 Removal of Swing Motors ..............149 1.9 Removal of Fan Motor................153 2.
Page 7 SiENBE04-925_A 2.2 Standby Electricity Saving..............269 2.3 Jumper and Switch Settings..............270 3. Application of Silicon Grease to a Power Transistor and a Diode Bridge .271 Part 9 Appendix................. 272 1. Piping Diagrams..................273 1.1 Indoor Unit....................273 1.2 Outdoor Unit ..................274 2. Wiring Diagrams..................276 2.1 Indoor Unit....................276 2.2 Outdoor Unit ..................276 Table of Contents...
Page 8 SiENBE04-925_A Table of Contents...
Page 9: Introduction
SiENBE04-925_A Introduction 1. Introduction Safety Cautions „ Be sure to read the following safety cautions before conducting repair work. Cautions and „ The caution items are classified into “ Warnings Warning” and “ Caution”. The “ Warning” items are especially important since they can lead to death or serious injury if they are not followed closely.
Page 10 Introduction SiENBE04-925_A Warning Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place (more than 2 m). Insufficient safety measures may cause a fall accident. In case of R-410A refrigerant models, be sure to use pipes, flare nuts and tools for the exclusive use of the R-410A refrigerant.
Page 11 SiENBE04-925_A Introduction 1.1.2 Cautions Regarding Safety of Users Warning Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools may cause an electrical shock, excessive heat generation or fire.
Page 12 Introduction SiENBE04-925_A Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug has dust or loose connection, it may cause an electrical shock or fire. Be sure to install the product correctly by using the provided standard For unitary type installation frame.
Page 13: Used Icons
SiENBE04-925_A Introduction Caution Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 MΩ 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 the water to enter the room and wet the furniture and floor.
Page 14 Introduction SiENBE04-925_A...
Page 15: Part 1 List Of Functions
SiENBE04-925_A Part 1 List of Functions 1. Functions....................2 List of Functions...
Page 16: Functions
Functions SiENBE04-925_A 1. Functions Category Functions Category Functions Basic Inverter Health & Air-Purifying Filter — — Function (with Inverter Power Control) Clean – – Operation Limit for Cooling (°CDB) Photocatalytic Deodorizing Filter — — Air-Purifying Filter with – – Operation Limit for Heating (°CWB) —...
Page 17: Part 2 Specifications
SiENBE04-925_A Part 2 Specifications 1. Specifications ..................4 Specifications...
Page 18: Specifications
Specifications SiENBE04-925_A 1. Specifications 50 Hz, 220 - 230 - 240V Indoor Units FTXL20G2V1B FTXL20G2V1B Models RXL20G2V1B RXL20G2V1B9 Outdoor Units Cooling Heating Cooling Heating 2.0 (1.4 ~ 4.0) 2.7 (1.4 ~ 5.2) 2.0 (1.4 ~ 4.0) 2.7 (1.4 ~ 5.2)
Page 19 SiENBE04-925_A Specifications 50 Hz, 220 - 230 - 240V Indoor Units FTXL25G2V1B FTXL35G2V1B Models RXL25G2V1B RXL35G2V1B Outdoor Units Cooling Heating Cooling Heating 2.5 (1.7 ~ 5.0) 3.4 (1.7 ~ 6.0) 3.5 (1.7 ~ 5.3) 4.0 (1.7 ~ 6.6) Capacity Btu/h 8,500 (5,800 ~ 17,100) 11,600 (5,800 ~ 20,500) 11,900 (5,800 ~ 18,100)
Page 20 Specifications SiENBE04-925_A Specifications...
Page 21: Part 3 Printed Circuit Board Connector Wiring Diagram
SiENBE04-925_A Part 3 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram........8 1.1 Indoor Unit....................8 1.2 Outdoor Unit ...................11 Printed Circuit Board Connector Wiring Diagram...
Page 22 Printed Circuit Board Connector Wiring Diagram SiENBE04-925_A 1. Printed Circuit Board Connector Wiring Diagram Indoor Unit Connectors and PCB (1): Control PCB Other Parts 1) S1 Connector for DC fan motor 2) S21 Connector for centralized control (HA) 3) S25 Connector for INTELLIGENT EYE sensor PCB 4) S32 Connector for indoor heat exchanger thermistor...
Page 23 SiENBE04-925_A Printed Circuit Board Connector Wiring Diagram PCB Detail PCB (1): Control PCB LED A 2P206687-1 Printed Circuit Board Connector Wiring Diagram...
Page 24 Printed Circuit Board Connector Wiring Diagram SiENBE04-925_A PCB (2): Signal Receiver PCB PCB (3): Display PCB RTH1 LED3 LED2 LED1 3P210728-1 3P210728-1 PCB (4): INTELLIGENT EYE Sensor PCB 3EB86013-1 Printed Circuit Board Connector Wiring Diagram...
Page 25: Outdoor Unit
SiENBE04-925_A Printed Circuit Board Connector Wiring Diagram Outdoor Unit 1.2.1 RXL20G2V1B Connectors and PCB (1): Filter PCB Other Parts 1) S11 Connector for main PCB 2) HL1, HN1, S Connector for terminal board 3) E1 Terminal for earth 4) E2 Connector for terminal board (earth) 5) HL2, HN2 Connector for main PCB...
Page 26 Printed Circuit Board Connector Wiring Diagram SiENBE04-925_A PCB Detail PCB (1): Filter PCB HL1 HN1 S (on main PCB) 3P203203-1 PCB (2): Main PCB LED A 2P203198-1 Printed Circuit Board Connector Wiring Diagram...
Page 27 SiENBE04-925_A Printed Circuit Board Connector Wiring Diagram 1.2.2 RXL20G2V1B9 Connectors and PCB (1): Filter PCB Other Parts 1) S11 Connector for main PCB 2) AC1, AC2, S Connector for terminal board 3) E1, E2 Terminal for earth 4) HL2, HN2 Connector for main PCB 5) HR1 Connector for reactor...
Page 28 Printed Circuit Board Connector Wiring Diagram SiENBE04-925_A PCB Detail PCB (1): Filter PCB E1, E2 (on main PCB) 3P254234-1 PCB (2): Main PCB U VW LED A S100 S50 2P254206-1 PCB (3): Forced Operation Button PCB S110 3P255755-1 Printed Circuit Board Connector Wiring Diagram...
Page 29 SiENBE04-925_A Printed Circuit Board Connector Wiring Diagram 1.2.3 RXL25G2V1B Connectors and PCB (1): Control PCB Other Parts 1) S20 Connector for electronic expansion valve coil 2) S40 Connector for overload protector 3) S70 Connector for fan motor 4) S80 Connector for four way valve coil 5) S90 Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe)
Page 30 Printed Circuit Board Connector Wiring Diagram SiENBE04-925_A PCB Detail PCB (1): Control PCB E (E2) HN1 HL1 LED A U, V, W 2P208173-1 Printed Circuit Board Connector Wiring Diagram...
Page 31 SiENBE04-925_A Printed Circuit Board Connector Wiring Diagram 1.2.4 RXL35G2V1B Connectors and PCB (1): Main PCB Other Parts 1) S10 Connector for terminal board (indoor-outdoor transmission) 2) S20 Connector for electronic expansion valve coil 3) S40 Connector for overload protector 4) S51, S101 Connector for service monitor PCB 5) S70 Connector for fan motor...
Page 32 Printed Circuit Board Connector Wiring Diagram SiENBE04-925_A PCB Detail PCB (1): Main PCB S101 2P169046-5 PCB (2): Service Monitor PCB LED A SW4-C S102 3P169059-1 Printed Circuit Board Connector Wiring Diagram...
Page 33 SiENBE04-925_A Part 4 Function and Control 1. Main Functions..................20 1.1 Frequency Principle................20 1.2 Airflow Direction Control.................22 1.3 Fan Speed Control for Indoor Units............23 1.4 Program Dry Operation ................24 1.5 Automatic Operation................25 1.6 Thermostat Control.................26 1.7 NIGHT SET Mode ..................27 1.8 ECONO Operation .................28 1.9 2-Area INTELLIGENT EYE Operation ...........29 1.10 Inverter POWERFUL Operation .............31 1.11 Other Functions..................32...
Page 34: Main Functions
Main Functions SiENBE04-925_A 1. Main Functions Note: The definitions of temperatures are classified as following. Š Room temperature: temperature of the lower part of the room Š Set temperature: temperature set by remote control Š Room thermistor temperature: temperature detected by room temperature thermistor Š...
Page 35 SiENBE04-925_A Main Functions Drawing of The following drawing shows a schematic view of the inverter principle: Inverter Refrigerant circulation rate (high) high speed Amount of heat Amount of heat exchanged air (large) exchanged air (large) high f low f Amount of heat Amount of heat exchanged air (small) exchanged air (small)
Page 36: Airflow Direction Control
Main Functions SiENBE04-925_A Airflow Direction Control Power-Airflow The large flaps send a large volume of air downwards to the floor and provide an optimum Dual Flaps control in cooling, dry, and heating mode. Cooling / Dry Mode During cooling or dry mode, the flap retracts into the indoor unit. Then, cool air can be blown far and pervaded all over the room.
Page 37: Fan Speed Control For Indoor Units
SiENBE04-925_A Main Functions Fan Speed Control for Indoor Units Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.
Page 38: Program Dry Operation
Main Functions SiENBE04-925_A 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 adjustment buttons are inoperable in this mode. Detail The microcomputer automatically sets the temperature and airflow rate.
Page 39: Automatic Operation
SiENBE04-925_A Main Functions Automatic Operation Outline Automatic Cooling / Heating Function When the AUTO mode is selected with the remote control, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up, and automatically operates in that mode. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
Page 40: Thermostat Control
Main Functions SiENBE04-925_A Thermostat Control Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Thermostat OFF Condition Š The temperature difference is in the zone A. Thermostat ON Condition Š The temperature difference returns to the zone C after being in the zone A. Š...
Page 41: Night Set Mode
SiENBE04-925_A Main Functions NIGHT SET Mode Outline When the OFF timer is set, the NIGHT SET Mode is automatically activated. The NIGHT SET Mode keeps the airflow rate setting. Detail The NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.
Page 42: Econo Operation
Main Functions SiENBE04-925_A ECONO Operation Outline The "ECONO operation" reduces the maximum operating current and the power consumption. This operation is particularly convenient for energy-saving-oriented users. It is also a major bonus for those whose breaker capacities do not allow the use of multiple electrical devices and air conditioners.
Page 43: 2-Area Intelligent Eye Operation
SiENBE04-925_A Main Functions 2-Area INTELLIGENT EYE Operation Outline The following functions can be performed by a motion sensor (INTELLIGENT EYE). 1. Reduction of the capacity when there is nobody in the room in order to save electricity (energy saving operation) 2.
Page 44: Area Intelligent Eye Operation
Main Functions SiENBE04-925_A 2. Motions (for example: in cooling) within 20 20 min. 20 min. minutes Human detection signal RESET. (From area A or B) Target temperature INTELLIGENT EYE lamp Remote control INTELLIGENT EYE button Operation Set speed Set speed Fan speed (H1) (R12183) „...
Page 45: Inverter Powerful Operation
SiENBE04-925_A Main Functions 1.10 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, operate the air conditioner by increasing the indoor fan rotating speed and the compressor frequency. Detail When POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
Page 46: Other Functions
Main Functions SiENBE04-925_A 1.11 Other Functions 1.11.1 Hot-Start Function In order to prevent the cold air blast that normally comes when heating operation is started, the temperature of the indoor heat exchanger is detected, and either the airflow is stopped or is made very weak thereby carrying out comfortable heating of the room.
Page 47: Function Of Thermistor
SiENBE04-925_A Function of Thermistor 2. Function of Thermistor Four way valve Compressor (R11582) A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe temperature. The system sets the target discharge pipe temperature according to the Exchanger outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve Thermistor...
Page 48: Control Specification
Control Specification SiENBE04-925_A 3. Control Specification Mode Hierarchy Outline There are two modes; the one is the normal operation mode and the other is the forced operation mode for installation and providing service. Detail There are following modes; stop, cooling (includes drying), heating (include defrosting) Air conditioner control mode Forced operating mode Forced cooling (for Pump Down Operation)
Page 49: Frequency Control
SiENBE04-925_A Control Specification Frequency Control Outline Frequency is determined according to the difference between the room thermistor temperature and the target temperature. The function is explained as follows. 1. How to determine frequency 2. Frequency command from the indoor unit (Difference between the room thermistor temperature and the target temperature) 3.
Page 50 Control Specification SiENBE04-925_A Indoor Frequency Command (ΔD signal) The difference between the room thermistor temperature and the target temperature is taken as the “ΔD signal” and is used for frequency command. ΔD ΔD ΔD ΔD Temperature Temperature Temperature Temperature difference signal difference signal...
Page 51: Controls At Mode Changing / Start-Up
SiENBE04-925_A 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 preheating command from the indoor unit, the outdoor temperature, and the discharge pipe temperature. „ RXL20/25G2V1B Detail ON Condition Š...
Page 52: Compressor Protection Function
Control Specification SiENBE04-925_A 3.3.2 Four Way Valve Switching Outline In heating operation, current is conducted, and in cooling and defrosting, current is not conducted. In order to eliminate the switching sound when the heating is stopped, as the four way valve coil switches from ON to OFF, the OFF delay switch of the four way valve is carried out after the operation stopped.
Page 53: Discharge Pipe Temperature Control
SiENBE04-925_A 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 this temperature from going up further. Detail Stop zone °C...
Page 54: Input Current Control
Control Specification SiENBE04-925_A Input Current Control Outline The microcomputer calculates the input current during the compressor is running, and sets the frequency upper limit from the input current. In case of heat pump model, this control which is the upper limit control of the frequency takes priority to the lower limit of control of four way valve operation compensation.
Page 55: Freeze-Up Protection Control
SiENBE04-925_A Control Specification Freeze-up Protection Control Outline During cooling operation, the signal sent from the indoor unit controls the operating frequency limitation and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) Detail The operating frequency limitation is judged with the indoor heat exchanger temperature.
Page 56: Outdoor Fan Control
Control Specification SiENBE04-925_A Outdoor Fan Control 1. Fan OFF delay when stopped The outdoor fan is turned OFF 60 seconds after the compressor stops. 2. 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.
Page 57: Defrost Control
SiENBE04-925_A 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. Detail Conditions for Starting Defrost „ The starting conditions is determined with the outdoor temperature and the outdoor heat exchanger temperature.
Page 58: Electronic Expansion Valve Control
Control Specification SiENBE04-925_A 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.
Page 59 SiENBE04-925_A Control Specification 3.11.1 Fully Closing with Power ON The electronic expansion valve is initialized when turning on the power. The opening position is set and the pressure equalization is developed. 3.11.2 Pressure Equalization Control When the compressor is stopped, the pressure equalization control is activated. The electronic expansion valve opens, and develops the pressure equalization.
Page 60 Control Specification SiENBE04-925_A Detail When the starting control (cooling : seconds, heating : seconds) finishes, the detection timer for disconnection of the discharge pipe thermistor ( 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.
Page 61: Malfunctions
SiENBE04-925_A Control Specification 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction may occur in the thermistor. Relating to Thermistor Malfunction 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.
Page 62: Forced Operation Mode
Control Specification SiENBE04-925_A 3.13 Forced Operation Mode Outline Forced operation mode includes only forced cooling. Detail Item Forced Cooling Conditions 1) The outdoor unit is not abnormal and not in the 3-minute standby mode. 2) The outdoor unit is not operating. The forced operation is allowed when the above both conditions are met.
Page 63 SiENBE04-925_A Part 5 Operation Manual 1. System Configuration................50 2. Operation Manual..................51 2.1 Auto Dry Cool Heat Fan Operation ............52 2.2 Adjusting the Airflow Direction..............54 2.3 COMFORT AIRFLOW and INTELLIGENT EYE Operation....56 2.4 POWERFUL Operation ................59 2.5 OUTDOOR UNIT QUIET Operation............60 2.6 ECONO Operation .................61 2.7 TIMER Operation ...................62 2.8 WEEKLY TIMER Operation ..............64...
Page 64: System Configuration
System Configuration SiENBE04-925_A 1. System Configuration After the installation and test operation of the room air conditioner have been completed, it should be operated and handled as described below. Every user would like to know the correct method of operation of the room air conditioner, to check if it is capable of cooling (or heating) well, and to know a clever method of using it.
Page 65: Operation Manual
SiENBE04-925_A Operation Manual 2. Operation Manual Remote Control „ Remote Control <Open the front cover> <ARC452A3> 1. Signal transmitter: 9. ECONO button: • It sends signals to the indoor unit. ECONO operation 2. Display: 10. SWING button: • It displays the current settings. •...
Page 66: Auto Dry Cool Heat Fan Operation
Operation Manual SiENBE04-925_A Auto Dry Cool Heat Fan Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. „ To start operation 1. Press “MODE selector button” and select a operation mode.
Page 67 SiENBE04-925_A Operation Manual „ To change the airflow rate setting 6. Press “FAN setting button”. DRY mode AUTO or COOL or HEAT or FAN mode Five levels of airflow rate setting from “ “ to “ ” The airflow rate setting is not variable. plus “...
Page 68: Adjusting The Airflow Direction
Operation Manual SiENBE04-925_A Adjusting the Airflow Direction You can adjust the airflow direction to increase your comfort. „ To adjust the horizontal blades (flaps) 1. Press “SWING button ”. • “ ” is displayed on the LCD and the flaps will begin to swing. 2.
Page 69 SiENBE04-925_A Operation Manual „ To start 3-D Airflow 1. 3. Press the “SWING button ” and the “SWING button ”: the “ ” and “ ” display will light up and the flap and louvers will move in turn. „ To cancel 3-D Airflow 2.
Page 70: Comfort Airflow And Intelligent Eye Operation
Operation Manual SiENBE04-925_A COMFORT AIRFLOW and INTELLIGENT EYE Operation The INTELLIGENT EYE incorporates infrared sensors to detect the presence of people in the conditioned room. When these sensors detect people, the louvers will adjust the airflow direction to an area where people are not present. When there are no people in the sensing areas, the air conditioner will go into energy- saving mode.
Page 71 SiENBE04-925_A Operation Manual Notes on “COMFORT AIRFLOW Operation” „ Note on the angles of the flaps • The flap position will change, preventing air from blowing directly on the occupants of the room. • POWERFUL operation and COMFORT AIRFLOW operation cannot be used at the same time. •...
Page 72 Operation Manual SiENBE04-925_A Notes on “INTELLIGENT EYE Operation” • While the air conditioner is in INTELLIGENT EYE operation, the louvers will adjust the airflow direction if there are people in the sensing areas of the INTELLIGENT EYE so that the leftward or rightward airflow will not be directed to the people.
Page 73: Powerful Operation
SiENBE04-925_A Operation Manual POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. „ To start POWERFUL operation 1. Press “POWERFUL button”. • POWERFUL operation ends in 20minutes. Then the system automatically operates again with the previous settings which were used before POWERFUL operation.
Page 74: Outdoor Unit Quiet Operation
Operation Manual SiENBE04-925_A OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. „ To start OUTDOOR UNIT QUIET operation 1.
Page 75: Econo Operation
SiENBE04-925_A Operation Manual ECONO Operation ECONO operation is a function which enables efficient operation by limiting the maximum power consumption value. This function is useful for cases in which attention should be paid to ensure a circuit breaker will not trip when the product runs alongside other appliances.
Page 76: Timer Operation
Operation Manual SiENBE04-925_A TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination. „ To use OFF TIMER operation •...
Page 77: Timer Operation
SiENBE04-925_A Operation Manual „ To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press “ON TIMER button”. 6:00 • “ ” is displayed on the LCD. “ ON ” blinks. •...
Page 78: Weekly Timer Operation
Operation Manual SiENBE04-925_A WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week. It is convenient if the WEEKLY TIMER is set according to the family’s life style. „ Using in these cases of WEEKLY TIMER An example of WEEKLY TIMER settings is shown below.
Page 79 SiENBE04-925_A Operation Manual „ To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. Program 1 Program 2 Program 3 Program 4 [Monday] 25°C 27°C...
Page 80 Operation Manual SiENBE04-925_A 8. Press “SELECT button” to select the desired temperature. • The temperature can be set between 10°C and 32°C. Cooling: The unit operates at 18°C even if it is set at 10 to 17°C. Heating: The unit operates at 30°C even if it is set at 31 to 32°C.
Page 81 SiENBE04-925_A Operation Manual Copy mode • A reservation made once can be copied another day of the week. The whole reservation of the selected day of the week will be copied. Program 1 Program 2 Program 3 Program 4 [Monday] 25°C 27°C 6:00...
Page 82 Operation Manual SiENBE04-925_A NOTE „ COPY MODE • The entire reservation of the source day of the week is copied in the copy mode. In the case of making a reservation change for any day of the week individually after copying the content of weekly reservations, press “...
Page 83 SiENBE04-925_A Operation Manual „ To deactivate WEEKLY TIMER operation 4. Press “WEEKLY button” while “ ” is displayed on the LCD. • The “ ” will disappear from the LCD. • The TIMER lamp goes off. • To reactivate the WEEKLY TIMER operation, press the “WEEKLY button” again. •...
Page 84 SiENBE04-925_A Part 6 Service Diagnosis 1. Caution for Diagnosis................70 1.1 Troubleshooting with LED ..............70 2. Problem Symptoms and Measures ............71 3. Service Check Function ................72 3.1 ARC452 Series..................72 4. Troubleshooting ..................75 4.1 Error Codes and Description ..............75 4.2 Indoor Unit PCB Abnormality ..............76 4.3 Freeze-up Protection Control or Heating Peak-cut Control....77 4.4 Fan Motor (DC Motor) or Related Abnormality........79 4.5 Thermistor or Related Abnormality (Indoor Unit)........81...
Page 85: Caution For Diagnosis
Caution for Diagnosis SiENBE04-925_A 1. Caution for Diagnosis Troubleshooting with LED Indoor Unit The operation lamp blinks when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.
Page 86: Problem Symptoms And Measures
SiENBE04-925_A Problem Symptoms and Measures 2. Problem Symptoms and Measures Symptom Check Item Details of Measure Reference Page The units does not operate. Check the power supply. Check to make sure that the rated voltage is — supplied. Check the type of the indoor units. Check to make sure that the indoor unit type is —...
Page 87: Service Check Function
Service Check Function SiENBE04-925_A 3. Service Check Function ARC452 Series Check Method 1 1. When the timer cancel button is held down for 5 seconds, “00” indication appears on the temperature display section. TIMER CANCEL button < ARC452 Series > (R12205) 2.
Page 88 SiENBE04-925_A Service Check Function Check Method 2 s , TEMP t , MODE) at the same time. 1. Press the 3 buttons (TEMP (R8381) The figure of the ten’s place blinks. (R8382) s or t button and change the figure until you hear the sound of “beep” or “pi 2.
Page 89 Service Check Function SiENBE04-925_A s or t button and change the figure until you hear the sound of “beep”. 5. Press the TEMP (R8383) 6. Diagnose by the sound. H“pi” : The figure of the ten’s place does not accord with the error code. H“pi pi”...
Page 90: Troubleshooting
SiENBE04-925_A Troubleshooting 4. Troubleshooting Error Codes and Description Reference Error Codes Description Page System Normal — Refrigerant shortage Low-voltage detection or over-voltage detection Signal transmission error (between indoor unit and outdoor unit) Unspecified voltage (between indoor unit and outdoor unit) Indoor Indoor unit PCB abnormality Unit...
Page 91: Indoor Unit Pcb Abnormality
Troubleshooting SiENBE04-925_A Indoor Unit PCB Abnormality Remote Control Display Method of Evaluation of zero-cross detection of power supply by the indoor unit PCB. Malfunction Detection Malfunction There is no zero-cross detection in approximately 10 seconds. Decision Conditions „ Wrong models interconnected Supposed „...
Page 92: Freeze-Up Protection Control Or Heating Peak-Cut Control
SiENBE04-925_A Troubleshooting Freeze-up Protection Control or Heating Peak-cut Control Remote Control Display „ Freeze-up protection control Method of Malfunction During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor. Detection „...
Page 93 Troubleshooting SiENBE04-925_A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.06 Refer to P.120 Check the air passage. Provide sufficient air passage. Is there any short circuit? Check the air filter.
Page 94: Fan Motor (Dc Motor) Or Related Abnormality
SiENBE04-925_A Troubleshooting Fan Motor (DC Motor) or Related Abnormality Remote Control Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation. Detection Malfunction The detected rotation speed does not reach the demanded rotation speed of the target tap, and Decision is less than 50% of the maximum fan motor rotation speed.
Page 95 Troubleshooting SiENBE04-925_A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Turn off the power supply Refer to P.118 and rotate the fan by hand. Does the fan Replace the indoor rotate smoothly? fan motor.
Page 96: Thermistor Or Related Abnormality (Indoor Unit)
SiENBE04-925_A Troubleshooting Thermistor or Related Abnormality (Indoor Unit) C4, C9 Remote Control Display Method of The temperatures detected by the thermistors determine thermistor errors. Malfunction Detection Malfunction The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Decision Conditions „...
Page 97: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)
Troubleshooting SiENBE04-925_A Signal Transmission Error (between Indoor Unit and Outdoor Unit) Remote Control Display Method of The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is Malfunction checked whether it is normal. Detection Malfunction The data sent from the outdoor unit cannot be received normally, or the content of the data is Decision abnormal.
Page 98: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)
SiENBE04-925_A Troubleshooting Unspecified Voltage (between Indoor Unit and Outdoor Unit) Remote Control Display Method of The supply power is detected for its requirements (different from pair type and multi type) by the indoor / outdoor transmission signal. Malfunction Detection Malfunction The pair type and multi type are interconnected.
Page 99: Outdoor Unit Pcb Abnormality
Troubleshooting SiENBE04-925_A Outdoor Unit PCB Abnormality Remote Control Display „ The system follows the microprocessor program as specified. Method of „ The system checks to see if the zero-cross signal comes in properly. Malfunction Detection „ The microprocessor program runs out of control. Malfunction „...
Page 100 SiENBE04-925_A Troubleshooting Troubleshooting 25 class Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn on the power again. Check the voltage between No.1 and No.2 on the outdoor terminal board.
Page 101: Ol Activation (Compressor Overload)
Troubleshooting SiENBE04-925_A OL Activation (Compressor Overload) Remote Control Display Method of A compressor overload is detected through compressor OL. Malfunction Detection „ If the error repeats twice, the system is shut down. Malfunction „ Reset condition: Continuous run for about 60 minutes without any other error Decision ∗...
Page 102: Compressor Lock
SiENBE04-925_A Troubleshooting 4.10 Compressor Lock Remote Control Display Method of A compressor lock is detected by checking the compressor running condition through the Malfunction position detection circuit. Detection Malfunction 20/25 class „ Operation stops due to overcurrent. Decision „ If the error repeats 16 times, the system is shut down. Conditions „...
Page 103: Dc Fan Lock
Troubleshooting SiENBE04-925_A 4.11 DC Fan Lock Remote Control Display Method of An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Malfunction Detection „ The fan does not start in 15 ~ 60 seconds (depending on the model) even when the fan Malfunction Decision motor is running.
Page 104: Input Overcurrent Detection
SiENBE04-925_A Troubleshooting 4.12 Input Overcurrent Detection Remote Control Display Method of An input overcurrent is detected by checking the input current value with the compressor Malfunction running. Detection „ The following current with the compressor running continues for 2.5 seconds. Malfunction Decision Cooling / Heating: Above 9.25 ~ 20 A (Refer to “Input current control”...
Page 105: Four Way Valve Abnormality
Troubleshooting SiENBE04-925_A 4.13 Four Way Valve Abnormality Remote Control Display Method of The room temperature thermistor, the indoor heat exchanger thermistor, the outdoor Malfunction temperature thermistor, and the outdoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Detection Malfunction A following condition continues over 1 ~ 10 minutes (depending on the model) after operating...
Page 106 SiENBE04-925_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.05 Four way valve Refer to P.119 coil disconnected (loose)? Correct it. Check No.06 Harness out of Refer to P.120 connector? Reconnect it.
Page 107: Discharge Pipe Temperature Control
Troubleshooting SiENBE04-925_A 4.14 Discharge Pipe Temperature Control Remote Control Display Method of An error is determined with the temperature detected by the discharge pipe thermistor. Malfunction Detection „ If the temperature detected by the discharge pipe thermistor rises above Malfunction °C, the Decision compressor stops.
Page 108 SiENBE04-925_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.04 Check No. 06 Refer to P.118 Check the thermistors. Replace the defective • Discharge pipe thermistor thermistor.
Page 109: High Pressure Control In Cooling
Troubleshooting SiENBE04-925_A 4.15 High Pressure Control in Cooling Remote Control Display Method of High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if Malfunction the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Detection „...
Page 110 SiENBE04-925_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.04 Check the installation space. Refer to P.118 Check No. 07 Check No.06 Check the installation Change the installation Refer to P.120 condition.
Page 111: Compressor System Sensor Abnormality
Troubleshooting SiENBE04-925_A 4.16 Compressor System Sensor Abnormality 4.16.1 20/25 Class Remote Control Display „ The system checks the DC current before the compressor starts. Method of Malfunction Detection „ The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output Malfunction Decision converted to voltage value)
Page 112 SiENBE04-925_A Troubleshooting 4.16.2 35 Class Remote Control Display „ The system checks the supply voltage and the DC voltage before the compressor starts. Method of „ The system checks the compressor current right after the compressor starts. Malfunction Detection „ The supply voltage and the DC voltage is obviously low or high. Malfunction „...
Page 113: Position Sensor Abnormality
Troubleshooting SiENBE04-925_A 4.17 Position Sensor Abnormality Remote Control Display Method of A compressor start-up failure is detected by checking the compressor running condition through Malfunction the position detection circuit. Detection „ If the error repeats, the system is shut down. Malfunction „...
Page 114 SiENBE04-925_A Troubleshooting Troubleshooting 20/25 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.29 Refer to P.125 Turn off the power. Check the power supply voltage. Voltage as rated? Correct the power supply.
Page 115 Troubleshooting SiENBE04-925_A Troubleshooting 35 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Voltage as Correct the power supply. rated? Check the connection.
Page 116: Dc Voltage / Current Sensor Abnormality (20/25 Class)
SiENBE04-925_A Troubleshooting 4.18 DC Voltage / Current Sensor Abnormality (20/25 Class) Remote Control Display Method of DC voltage or DC current sensor abnormality is identified based on the compressor running Malfunction frequency and the input current. Detection „ The compressor running frequency is above 52 Hz. Malfunction „...
Page 117: Ct Or Related Abnormality (35 Class)
Troubleshooting SiENBE04-925_A 4.19 CT or Related Abnormality (35 Class) Remote Control Display Method of A CT or related error is detected by checking the compressor running frequency and CT- Malfunction detected input current. Detection „ The compressor running frequency is more than 55 Hz, and the CT input current is below Malfunction Decision 0.5 A.
Page 118 SiENBE04-925_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.12 Turn off the power and turn it on Refer to P.123 again. Start operation. ∗ Running current as shown at right Replace the outdoor unit with relay cable 1 or 2?
Page 119: Thermistor Or Related Abnormality (Outdoor Unit)
Troubleshooting SiENBE04-925_A 4.20 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Remote Control Display Method of This fault is identified based on the thermistor input voltage to the microcomputer. Malfunction A thermistor fault is identified based on the temperature sensed by each thermistor. Detection „...
Page 120 SiENBE04-925_A Troubleshooting Troubleshooting In case of “H9” “J3” “J6” Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.06 Refer to P.120 Turn on the power again. Error displayed again on remote control? Reconnect the connectors or thermistors.
Page 121: Electrical Box Temperature Rise
Troubleshooting SiENBE04-925_A 4.21 Electrical Box Temperature Rise Remote Control Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor off. Detection „ With the compressor off, the radiation fin temperature is above Malfunction °C.
Page 122 SiENBE04-925_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power and turn it on Check No.07 WARNING again. Refer to P.121 To cool the electrical components, the outdoor fan starts when the radiation fin temperature rises above...
Page 123: Radiation Fin Temperature Rise
Troubleshooting SiENBE04-925_A 4.22 Radiation Fin Temperature Rise Remote Control Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor on. Detection „ If the radiation fin temperature with the compressor on is above Malfunction °C.
Page 124 SiENBE04-925_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.07 Turn off the power and turn it on Refer to P.121 again to start the system. Check No.09 Refer to P.122 Error displayed again?
Page 125: Output Overcurrent Detection
Troubleshooting SiENBE04-925_A 4.23 Output Overcurrent Detection Remote Control Display Method of An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Detection „ A position signal error occurs while the compressor is running. Malfunction „...
Page 126 SiENBE04-925_A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. ∗ An output overcurrent signal may result from wrong internal wiring. If the wires have been Check No.07 disconnected and reconnected and the system is interrupted by an output overcurrent, take the following procedure.
Page 127: Refrigerant Shortage
Troubleshooting SiENBE04-925_A 4.24 Refrigerant Shortage Remote Control Display Method of Refrigerant shortage detection I: Malfunction Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If the refrigerant is short, the input current is smaller than the normal value. Detection Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of...
Page 128 SiENBE04-925_A Troubleshooting Refrigerant shortage detection III : (20 class only) When the difference of the temperature is smaller than °C, it is regarded as refrigerant shortage. (°C) room thermistor temperature – indoor heat exchanger temperature Cooling outdoor heat exchanger temperature – outdoor temperature thermistor indoor heat exchanger temperature –...
Page 129 Troubleshooting SiENBE04-925_A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.04 Refer to P.118 Any thermistor Replace them in position. disconnected? ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗...
Page 130: Low-Voltage Detection Or Over-Voltage Detection
SiENBE04-925_A Troubleshooting 4.25 Low-voltage Detection or Over-voltage Detection Remote Control Display Method of Low-voltage detection: Malfunction An abnormal voltage drop is detected by the DC voltage detection circuit. Detection Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit. Malfunction Low-voltage detection: „...
Page 131 Troubleshooting SiENBE04-925_A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the supply voltage. Supply voltage as specified? Correct the power supply. Rotate the fan by hand. Does the fan rotate smoothly? Replace the fan motor or the outdoor unit PCB.
Page 132: Signal Transmission Error On Outdoor Unit Pcb (35 Class Only)
SiENBE04-925_A Troubleshooting 4.26 Signal Transmission Error on Outdoor Unit PCB (35 Class Only) Remote Control Display Method of Communication error between microcomputer mounted on the main microcomputer and PM1. Malfunction Detection „ The abnormality is determined when the data sent from the PM1 can not be received for 9 Malfunction Decision seconds.
Page 133: Check
Check SiENBE04-925_A 5. Check How to Check 5.1.1 Fan Motor Connector Output Check Check No.01 1. Check the connection of connector. 2. Check the motor power supply voltage output (pins 4 - 7). 3. Check the motor control voltage (pins 4 - 3). 4.
Page 134: Four Way Valve Performance Check
SiENBE04-925_A Check 5.1.3 Four Way Valve Performance Check Check No.05 Turn off the power and turn it on again. ∗ Four way valve coil Start heating operation. Cooling / Dry : No continuity Heating : Continuity S80 voltage at 220 - 240 VAC with Replace the outdoor unit compressor on? PCB.
Page 135: Thermistor Resistance Check
Check SiENBE04-925_A 5.1.4 Thermistor Resistance Check Check No.06 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the table and the graph below.
Page 136: Installation Condition Check
SiENBE04-925_A Check 5.1.5 Installation Condition Check Check No.07 Installation condition check Check the Abnormal allowable dimensions of Change the installation the air suction and location or direction. discharge area. Normal Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor Clean the outdoor heat heat exchanger very dirty?
Page 137: Outdoor Fan System Check
Check SiENBE04-925_A 5.1.7 Outdoor Fan System Check Check No.09 DC motor Check the outdoor fan system. Outdoor fan Fan motor lead running? wire connector disconnected? Reconnect the connector. Outdoor fan system is functioning. Go to Check No. 15. (R7159) 5.1.8 Power Supply Waveforms Check Check No.10 Measure the power supply waveform between No.
Page 138: Capacitor Voltage Check
SiENBE04-925_A Check 5.1.10 Capacitor Voltage Check Check No.12 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) Reactor lead wire...
Page 139: Rotation Pulse Check On The Outdoor Unit Pcb
Check SiENBE04-925_A 5.1.12 Rotation Pulse Check on the Outdoor Unit PCB Check No.15 RXL20-35G2V1B Make sure that the voltage of 320 ± 30 V is applied. 1. Set operation off and power off. Disconnect the connector S70. 2. Check that the voltage between the pins 4 - 7 is 320 VDC. 3.
Page 140: Main Circuit Short Check
SiENBE04-925_A Check 5.1.13 Main Circuit Short Check Check No.29 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V before checking. „ Measure the resistance between the pins of the DB1 as below. „...
Page 141: Part 7 Removal Procedure
SiENBE04-925_A Part 7 Removal Procedure 1. Indoor Unit...................128 1.1 Removal of Air Filter................128 1.2 Removal of Front Panel................130 1.3 Removal of Front Grille ................132 1.4 Removal of Horizontal Blades / Vertical Blades ........135 1.5 Removal of Electrical Box ..............138 1.6 Removal of PCB...................141 1.7 Removal of Indoor Heat Exchanger .............146 1.8 Removal of Swing Motors ..............149 1.9 Removal of Fan Motor................153...
Page 142 SiENBE04-925_A 5.6 Removal of Sound Blanket / Thermistors..........259 5.7 Removal of Four Way Valve..............261 5.8 Removal of Electronic Expansion Valve..........262 5.9 Removal of Compressor...............263 Removal Procedure...
Page 143: Indoor Unit
Indoor Unit SiENBE04-925_A 1. Indoor Unit Removal of Air Filter Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Appearance features Warning Dangerous: High voltage A high voltage is applied to all the electric circuits of this product including thermistors.
Page 144 SiENBE04-925_A Indoor Unit Step Procedure Points 3. Remove the Titanium apatite photocatalytic air- purifying filter. „ The Titanium apatite The Titanium apatite Air filter photocatalytic air- photocatalytic air-purifying purifying filter ASSY is filter is not marked for attached to the back of difference between the right the air filter.
Page 145: Removal Of Front Panel
Indoor Unit SiENBE04-925_A Removal of Front Panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Hold the both sides of Front panel the front panel, and open the panel over the position where it stops.
Page 146 SiENBE04-925_A Indoor Unit Step Procedure Points When mounting the Caution on Mounting Shaft „ When mounting the front front panel, make sure that the shaft is fitted in panel, fit the right and left the guide before closing rotary shafts one by one into the panel.
Page 147: Removal Of Front Grille
Indoor Unit SiENBE04-925_A Removal of Front Grille Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the service cover. Remove the screw of Preparation Service cover „...
Page 148 SiENBE04-925_A Indoor Unit Step Procedure Points 2. Remove the front grille. Remove the 2 screws. (one each at the right and left) (R12267) The front grille has 3 Hooks hooks at the top. (R8076) Unfasten the left hook. Front grille (R7917) Unfasten the center hook.
Page 149 Indoor Unit SiENBE04-925_A Step Procedure Points Unfasten the right hook. (R8078) Pull the upper part of Caution on Mounting „ When mounting the front the front grille out and lift the lower part up, grille, make sure that the 3 and then remove the hooks are fastened as they front grille.
Page 150: Removal Of Horizontal Blades / Vertical Blades
SiENBE04-925_A Indoor Unit Removal of Horizontal Blades / Vertical Blades Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the horizontal blade (large). Open the horizontal Caution on Mounting „...
Page 151 Indoor Unit SiENBE04-925_A Step Procedure Points 2. Remove the horizontal blade (small). Unfasten the center shaft while bending the horizontal blade (small) Horizontal blade (small) slightly. (R7925) Unfasten the left shaft. (R7926) Unfasten the key alignment shaft at the right side. (R7927) 3.
Page 152 SiENBE04-925_A Indoor Unit Step Procedure Points 4. Remove the vertical blade ASSY. Detach the pivot from Pivot Vertical blade ASSY the interlock shaft for vertical blades with a flat screwdriver. Interlock shaft (R12270) Remove the interlock rod. Interlock rod (R10302) Unfasten the hooks at the upper 3 positions by pressing them with a...
Page 153: Removal Of Electrical Box
Indoor Unit SiENBE04-925_A Removal of Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points The figure shows the Preparation Electrical box „ Remove the front grille connections of wire harnesses.
Page 154 SiENBE04-925_A Indoor Unit Step Procedure Points Disconnect the connector for swing motors [S41]. [S41] (R7935) Release the harness for swing motors from the hook. (R7936) „ Be careful not to lose the Pull out the indoor heat Indoor heat exchanger thermistor exchanger thermistor.
Page 155 Indoor Unit SiENBE04-925_A Step Procedure Points Remove the screw of the electrical box. (R3939) Unfasten the hook at the upper far side by pressing it from above and pulling the Hook electrical box toward yourself. (R8081) „ There is a hook also at the Lift up the electrical box and pull it out.
Page 156: Removal Of Pcb
SiENBE04-925_A Indoor Unit Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the shield plate. The figure shows the Preparation „ Remove the electrical box appearance of the Shield plate electrical box.
Page 157 Indoor Unit SiENBE04-925_A Step Procedure Points 3. Remove the signal Signal receiver unit receiver unit. Unfasten the 3 hooks. (R12277) Unfasten the hook on the opposite side, and lift up the signal receiver unit. (R8262) Hook (R12278) Remove the signal receiver unit.
Page 158 SiENBE04-925_A Indoor Unit Step Procedure Points 4. Remove the INTELLIGENT EYE sensor PCB. Unfasten the 3 hooks INTELLIGENT EYE and remove the sensor PCB INTELLIGENT EYE sensor PCB. (R8092) Disconnect the [S26] connector [S26] from the INTELLIGENT EYE sensor PCB. (R8093) 5.
Page 159 Indoor Unit SiENBE04-925_A Step Procedure Points „ The display PCB is 6. Remove the display PCB. positioned on the rear side The figure shows the of the signal receiver unit. connection of wire harness for the display PCB. Display PCB (R8094) Unfasten the 4 hooks and remove the display...
Page 160 SiENBE04-925_A Indoor Unit Step Procedure Points „ When mounting the control Lift up the bottom of the control PCB and pull it PCB, make sure that it is out. fixed by upper 2 hooks. (R8098) The figures show the names of the PCB component parts.
Page 161: Removal Of Indoor Heat Exchanger
Indoor Unit SiENBE04-925_A Removal of Indoor Heat Exchanger Procedure Warning Be sure to turn off all power supplies at least 10 min. before disassembling work. Step Procedure Points 1. Disconnect the refrigerant piping. Remove the screws which fix the indoor heat exchanger to the installation plate.
Page 162 SiENBE04-925_A Indoor Unit Step Procedure Points 2. Remove the indoor heat Preparation „ Remove the indoor unit from exchanger. the installation plate. Unfasten the hook of Piping the piping fixture at the fixture back of the indoor unit and pull out the pipe. (R10622) Widen the auxiliary pipe by about 10-20...
Page 163 Indoor Unit SiENBE04-925_A Step Procedure Points „ When mounting the indoor After unfastening the Indoor heat exchanger lower hooks, lift up the heat exchanger, make sure indoor heat exchanger that the hook (right) is by its right side. fastened. Hook (R1032 Remove the indoor heat exchanger.
Page 164: Removal Of Swing Motors
SiENBE04-925_A Indoor Unit Removal of Swing Motors Procedure Warning Be sure to turn off all power supplies at least 10 minutes before disassembling work. Step Procedure Points 1. Remove the swing motor for vertical blade. Lift the indoor unit with a wooden base.
Page 165 Indoor Unit SiENBE04-925_A Step Procedure Points Detach the pivot from Pivot Vertical blade ASSY the interlock shaft for vertical blades with a flat screwdriver. Interlock shaft (R12270) Remove the swing motor unit. Swing motor unit (R8126) Detach the interlock Interlock shaft shaft from the swing motor with a flat screw- driver.
Page 166 SiENBE04-925_A Indoor Unit Step Procedure Points Remove the 2 screws. Screws (R10332) Remove the swing motor for vertical blade. (R10333) „ Connector : green Disconnect the connector. (R10334) Removal Procedure...
Page 167 Indoor Unit SiENBE04-925_A Step Procedure Points 2. Remove the swing motor for horizontal blade. Caution When reassembling, do not Remove the screw and confuse the installing order remove the swing of the 2 motors and the motors for horizontal colors of the connectors. blades.
Page 168: Removal Of Fan Motor
SiENBE04-925_A Indoor Unit Removal of Fan Motor Procedure Warning Be sure to turn off all power supplies at least 10 min. before disassembling work. Step Procedure Points 1. Remove the right side Preparation „ Remove the indoor heat panel. exchanger according to the “Removal of Indoor Heat Exchanger”.
Page 169 Indoor Unit SiENBE04-925_A Step Procedure Points Remove the 2 screws of the fan motor fixing plate. Fan motor fixing plate (R8116) Unfasten the hook of the fan motor fixing plate and remove the plate. (R8117) (R8118) 2. Remove the fan rotor. Dislocate the fan rotor by sliding it to the right.
Page 170 SiENBE04-925_A Indoor Unit Step Procedure Points „ When reassembling the fan Loosen the lock screw and remove the fan rotor, provide as much as rotor. 5 mm of play between the Lock screw side face of the rotor and the bottom frame.
Page 171: Outdoor Unit - Rxl20G2V1B
Outdoor Unit - RXL20G2V1B SiENBE04-925_A 2. Outdoor Unit - RXL20G2V1B Removal of Outer Panels / Fan Motor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1.
Page 172 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Remove the 2 screws Top panel and lift the top panel. (R7190) Remove the drip proof Drip proof plate plate. (R7191) Remove the 4 screws and remove the discharge grille. Discharge grille (R7192) „...
Page 173 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points Remove the screw and remove the drain pan heater cover. Drain pan heater cover (R9329) Remove the 7 screws of the front panel. Front panel (R12304) „ The front panel has 4 hooks. Unfasten the hooks.
Page 174 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points „ The screw has reverse 3. Remove the fan motor. winding. Remove the washer- „ Nut size: M6 fitted nut of the outdoor fan. 10 mm (R12236) Outdoor fan (R7196) „ When reassembling, align Remove the outdoor fan.
Page 175 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points Disconnect the [S70] connector for the fan motor [S70]. (R9332) Release the fan motor Fan motor lead wire from the hook. lead wire (R7200) „ When reassembling, put the Open the hooks and release the fan motor fan motor lead wire through lead wire.
Page 176 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Remove the screw and remove the fan motor fixing frame. Fan motor fixing frame (R9333) (R9334) „ When reassembling, fit the lower hooks into the bottom frame. (R7206) Removal Procedure...
Page 177 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points 4. Remove the right side panel. Remove the 2 screws on the rear side. (R12312) Release the outdoor temperature thermistor. Outdoor temperature thermistor (R12289) Remove the 4 screws on the right side panel. Right side panel (R9337) Removal Procedure...
Page 178 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Remove the screw near the stop valves. (R7211) „ When reassembling, make Unfasten the hook on the rear side. sure to fit the hook. (R7212) „ When reassembling, make Lift up the right side panel and remove it.
Page 179: Removal Of Electrical Box
Outdoor Unit - RXL20G2V1B SiENBE04-925_A Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Disconnect the 2 Preparation „ Remove the panels and connectors for the reactor.
Page 180 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Disconnect the [S90] [S50] connectors for the magnetic relay [S50] and for the thermistors [S90]. (R9341) Disconnect the [S40] [S10] connectors for the filter PCB [S10] and for the overload protector [S40]. (R9342) Disconnect the [S80] [S20]...
Page 181 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points Disconnect the [HN3] [HL3] connectors for the filter PCB [HL3] [HN3]. (R9344) Remove the wire Wire harness harness for standby electricity saving. (R9345) Cut the clamps at 2 locations. (R9346) Disconnect the connectors for the drain pan heater with a flat screwdriver.
Page 182 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Lift and remove the Electrical box electrical box. (R9348) Removal Procedure...
Page 183: Removal Of Drain Pan Heater
Outdoor Unit - RXL20G2V1B SiENBE04-925_A Removal of Drain Pan Heater Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the drain pan heater. Cut the clamp. (R9349) Remove the screw of the mounting clamp.
Page 184 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Cut the clamp. (R9352) Remove the 3 screws Left side panel and remove the left side panel. (R12307) The fuses are inside the drain pan heater. Fuse (R9354) (R9355) Removal Procedure...
Page 185: Removal Of Thermistors
Outdoor Unit - RXL20G2V1B SiENBE04-925_A Removal of Thermistors Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points „ Be careful not to lose the clip Release the discharge pipe thermistor.
Page 186 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Feature of the thermistors (R9356) Removal Procedure...
Page 187: Removal Of Pcb
Outdoor Unit - RXL20G2V1B SiENBE04-925_A Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points „ You can remove the main 1. Remove the main PCB. PCB when you disconnect Feature of the main the lead wires on the...
Page 188 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Remove the 4 screws. Screws (R9359) Unfasten the 3 hooks on the upper side. (R9360) Lift and pull out the main PCB. (R9361) Removal Procedure...
Page 189 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points „ Refer to page 12 for detail. Feature of the main [S30] [S10] [S40] [S90] [S50] [S10] [HL3] [HN3]: filter PCB [S20]: electronic expansion valve coil [S30]: compressor [S40]: overload protector [S50]: magnetic relay [S70]: fan motor [S70] [S80]: four way valve coil...
Page 190: Removal Of Reactor / Partition Plate
SiENBE04-925_A Outdoor Unit - RXL20G2V1B Removal of Reactor / Partition Plate Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the reactor. Preparation Reactor „ Remove the outer panels Remove the screw and according to the “Removal of remove the reactor.
Page 191 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points The partition plate has a hook on the lower side. Lift and pull the partition plate to remove. (R7227) „ When reassembling, fit the lower hook into the bottom frame. Hook (R7228) Removal Procedure...
Page 192: Removal Of Sound Blanket
SiENBE04-925_A Outdoor Unit - RXL20G2V1B Removal of Sound Blanket Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Untie the string and Preparation „ Remove the outer panels open the sound blanket (outer).
Page 193: Removal Of Four Way Valve
Outdoor Unit - RXL20G2V1B SiENBE04-925_A Removal of Four Way Valve Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Pull out the electronic expansion valve coil. Electronic expansion valve coil...
Page 194 SiENBE04-925_A Outdoor Unit - RXL20G2V1B Step Procedure Points Remove the screw and Four way valve coil remove the four way Warning valve coil. Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine.
Page 195 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points Note: „ Do not use a metal saw for cutting pipes by all means because the sawdust comes into the circuit. „ When withdrawing the pipes, be careful not to pinch them firmly with pliers.
Page 196: Removal Of Compressor
SiENBE04-925_A Outdoor Unit - RXL20G2V1B Removal of Compressor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the 2 nuts of the compressor. Warning Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine.
Page 197 Outdoor Unit - RXL20G2V1B SiENBE04-925_A Step Procedure Points Heat up the brazed part Note: „ Do not use a metal saw for of the suction side and disconnect. cutting pipes by all means because the sawdust comes into the circuit. „...
Page 198: Outdoor Unit - Rxl20G2V1B9
SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 3. Outdoor Unit - RXL20G2V1B9 Removal of Outer Panels / Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Appearance features (R7186) „...
Page 199 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points Remove the 2 screws Top panel and lift the top panel. (R7190) Remove the drip proof Drip proof plate plate. (R7191) Remove the 4 screws and remove the discharge grille. Discharge grille (R7192) „...
Page 200 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Remove the screw and remove the drain pan heater cover. Drain pan heater cover (R9329) Remove the 7 screws of the front panel. Front panel (R12304) „ The front panel has 4 hooks. Unfasten the hooks.
Page 201 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points „ The screw has reverse 3. Remove the fan motor. winding. Remove the washer- „ Nut size: M6 fitted nut of the outdoor fan. 10 mm (R12236) Outdoor fan (R11827) „ When reassembling, align Remove the outdoor fan.
Page 202 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Cut the clamp. (R11830) Disconnect the connector for the fan motor [S70]. [S70] (R11831) Release the fan motor Fan motor lead wire from the hook. lead wire (R11832) Removal Procedure...
Page 203 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points Remove the screw and remove the fan motor fixing frame. Fan motor fixing frame (R12309) (R12310) „ When reassembling, fit the lower hooks into the bottom frame. (R7206) Removal Procedure...
Page 204 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points „ When reassembling, put the Open the hooks and release the fan motor fan motor lead wire through lead wire. the back of the fan motor (so as not to be entangled with the outdoor fan).
Page 205 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points Remove the 4 screws on the right side panel. Right side panel (R9337) Remove the screw near the stop valves. (R11839) „ When reassembling, make Unfasten the hook on the rear side. sure to fit the hook.
Page 206 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points „ When reassembling, make Lift up the right side panel and remove it. sure to fit the hook. Hook (R12272) Removal Procedure...
Page 207: Removal Of Electrical Box
Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Removal of Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Disconnect the Preparation „ Remove the panels and connector for the overload protector disconnect the connector for [S40].
Page 208 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Disconnect the relay connector for the compressor. (R11845) Disconnect the connector for the electronic expansion valve coil [S20]. [S20] (R11847) Cut the clamp. (R11850) „ Be careful not to lose the clip Pull out the outdoor heat exchanger for the thermistor.
Page 209 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points „ Be careful not to lose the clip Release the discharge pipe thermistor. for the thermistor. Clip (R12279) Discharge pipe thermistor (R11849) Disconnect the connectors for the drain pan heater with a flat screwdriver.
Page 210: Removal Of Drain Pan Heater
SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Removal of Drain Pan Heater Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the drain pan heater. Cut the clamp. (R9349) Remove the screw of the mounting clamp.
Page 211 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points Cut the clamp. (R9352) Remove the 3 screws Left side panel and remove the left side panel. (R12307) The fuses are inside the drain pan heater. Fuse (R9354) Removal Procedure...
Page 212: Removal Of Pcb
SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points „ You can remove the main 1. Remove the main PCB. PCB when you disconnect Feature of the main the lead wires on the...
Page 213 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points „ Be careful of a sharp Pull out the forced operation button PCB. protrusion at the back of the Disconnect the forced operation button connector [S110] to PCB. remove the forced operation button PCB. Forced operation button PCB (R11856) Disconnect the relay...
Page 214 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Release the harness. (R11859) Cut the clamps at the 2 locations. (R11860) Disconnect the connector for the filter PCB [S10]. [S10] (R11861) Removal Procedure...
Page 215 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points Disconnect the connectors for the [S100] magnetic relay [S50] and for the forced operation button PCB [S100]. [S50] (R11862) Disconnect the connector for the filter [HN3] PCB [HL3] [HN3]. [HL3] (R11863) Release the harnesses from the hook.
Page 216 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Remove the 6 screws. (R11866) Unfasten the 4 hooks and remove the main PCB. (R11867) „ Refer to page 14 for detail. [S50] [S100] [S10] [HL3] [HN3]: filter PCB [S20]: electronic expansion valve coil [HN3] [S40]: overload protector...
Page 217 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points 2. Remove the filter PCB. Release the harnesses from the hook. Filter PCB (R11869) Cut the clamp. (R11871) Release the harnesses from the hook. (R11872) Removal Procedure...
Page 218 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Release the harnesses from the hooks. (R11873) Remove the screw. (R11874) Unfasten the 2 hooks. Filter PCB (R11876) Lift and pull out the filter PCB. (R11877) Removal Procedure...
Page 219 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points „ Refer to page 14 for detail. Feature of the filter (R11878) Removal Procedure...
Page 220: Removal Of Reactor / Partition Plate
SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Removal of Reactor / Partition Plate Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the reactor. Preparation Reactor „ Remove the outer panels Remove the screw and according to the “Removal of remove the reactor.
Page 221 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points The partition plate has a hook on the lower side. Lift and pull the partition plate to remove. (R12280) „ When reassembling, fit the lower hook into the bottom frame. (R11883) Removal Procedure...
Page 222: Removal Of Sound Blanket
SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Removal of Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points „ Since the piping ports are Remove the sound blanket (top).
Page 223 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points Pull the sound blanket (inner) out. Sound blanket (inner) (R11887) Pull the sound blanket (bottom) out. Sound blanket (bottom) (R11888) Removal Procedure...
Page 224: Removal Of Four Way Valve
SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Removal of Four Way Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Pull out the electronic expansion valve coil. Electronic expansion valve coil (R7233)
Page 225 Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Step Procedure Points Remove the screw and Four way valve coil remove the four way Warning valve coil. Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine.
Page 226 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Note: „ Do not use a metal saw for cutting pipes by all means because the sawdust comes into the circuit. „ When withdrawing the pipes, be careful not to pinch them firmly with pliers.
Page 227: Removal Of Compressor
Outdoor Unit - RXL20G2V1B9 SiENBE04-925_A Removal of Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the 2 nuts of the compressor. Warning Be careful not to get yourself burnt with pipes and other parts that are heated by the gas brazing machine.
Page 228 SiENBE04-925_A Outdoor Unit - RXL20G2V1B9 Step Procedure Points Heat up the brazed part Note: „ Do not use a metal saw for of the suction side and disconnect. cutting pipes by all means because the sawdust comes into the circuit. „...
Page 229: Outdoor Unit - Rxl25G2V1B
Outdoor Unit - RXL25G2V1B SiENBE04-925_A 4. Outdoor Unit - RXL25G2V1B Removal of Outer Panels Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Appearance features (R7186) (R12288) 2.
Page 230 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points „ The front panel has 4 hooks. Remove the 2 screws Top panel to remove the top panel, and 7 screws to remove the front panel. Hooks Hooks (R12305) Discharge grille Front panel „...
Page 231: Removal Of Electrical Box
Outdoor Unit - RXL25G2V1B SiENBE04-925_A Removal of Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points „ When reassembling, fasten 1. Disconnect the connecting wires. the wires with screws on the terminal board.
Page 232 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points Remove the screw of the terminal board. Terminal strip (R9366) Disconnect the connectors of the drain pan heater. (R9367) Cut the clamp. (R9368) „ For removal procedure of the Disconnect the connector for the fan fan motor lead wire, refer to [S70] motor [S70].
Page 233 Outdoor Unit - RXL25G2V1B SiENBE04-925_A Step Procedure Points Disconnect the connector for the [S40] overload protector [S40]. (R0255) Disconnect the connector for the [S20] electronic expansion valve coil [S20]. (R0256) Disconnect the connector for the four [S80] way valve coil [S80]. (R0257) Disconnect the [S90]...
Page 234 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points Disconnect the relay connector for the compressor. (R0259) Disconnect the 2 connectors for the reactor. (R0260) „ Be careful not to lose the clip Release the discharge pipe thermistor. for the thermistor. Clip (R12279) Discharge...
Page 235 Outdoor Unit - RXL25G2V1B SiENBE04-925_A Step Procedure Points Remove the screw in front of the electrical box. (R0263) Lift and remove the electrical box. (R0264) Removal Procedure...
Page 236: Removal Of Pcb
SiENBE04-925_A Outdoor Unit - RXL25G2V1B Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the screw and Preparation „ Remove the panels remove the electrical Electrical box cover box cover.
Page 237 Outdoor Unit - RXL25G2V1B SiENBE04-925_A Step Procedure Points Release the earth wire from the hook. (R8159) Remove the 2 screws and detach the 1 clip to remove the radiation Clip shield plate. Radiation shield plate (R12198) (R8161) Cut off the 5 clamps and disconnect the wire harnesses.
Page 238 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points Remove the 8 screws in total to remove the PCB. (R8163) (R8164) „ When reassembling, make Lift up the back side slightly and unfasten sure that the hooks of the the hooks of the front. electrical box are placed on the PCB.
Page 239 Outdoor Unit - RXL25G2V1B SiENBE04-925_A Step Procedure Points Remove the PCB. (R8168) „ Refer to page 16 for detail. Detach the terminals from the terminal board. [S20] [S70] [S40] [S80] [S90] (R8169) [S20] : electronic expansion valve coil [S40] : overload protector [S70] : fan motor [S80] : four way valve coil [S90] : thermistors...
Page 240 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points Remove the screw of the radiation fin. Radiation fin (R12214) (R8171) Removal Procedure...
Page 241: Removal Of Drain Pan Heater
Outdoor Unit - RXL25G2V1B SiENBE04-925_A Removal of Drain Pan Heater Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the drain pan heater. Cut the clamp. (R9369) Remove the screw of the mounting clamp.
Page 242 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points Cut the clamp. (R9352) Remove the 3 screws Left side panel and remove the left side panel. (R12307) The fuses are inside the drain pan heater. Fuse (R9354) (R9355) Removal Procedure...
Page 243: Removal Of Sound Blanket
Outdoor Unit - RXL25G2V1B SiENBE04-925_A Removal of Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the partition plate. Partition plate Remove the 2 screws. „...
Page 244 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points „ Since the piping ports are 2. Remove of the sound blanket. torn easily, remove the blanket carefully. Untie the string, open the sound blanket (outer) and pull it out. (R12199) Sound blanket (outer) (R8180) Remove the sound Sound blanket (top upper)
Page 245: Removal Of Outdoor Fan / Fan Motor
Outdoor Unit - RXL25G2V1B SiENBE04-925_A Removal of Outdoor Fan / Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points „ The screw has reverse 1. Remove the outdoor fan. winding.
Page 246 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points The figure shows the arrangement of the fan motor lead wire. (R8185) Remove the 1 screw of the fan motor fixing frame. Fan motor fixing frame (R12202) (R8187) Remove the fan motor fixing frame.
Page 247 Outdoor Unit - RXL25G2V1B SiENBE04-925_A Step Procedure Points Turn the fan motor fixing frame backward and open the 2 hooks of the fan motor lead wire. (R8189) „ When reassembling, put the Release the fan motor lead wire. fan motor lead wire through the back of the fan motor (so as not to be entangled with the outdoor fan).
Page 248: Removal Of Thermistors
SiENBE04-925_A Outdoor Unit - RXL25G2V1B Removal of Thermistors Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points „ Be careful not to lose the clip Release the discharge pipe thermistor.
Page 249: Removal Of Four Way Valve / Electronic Expansion Valve
Outdoor Unit - RXL25G2V1B SiENBE04-925_A Removal of Four Way Valve / Electronic Expansion Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the peripheries. Preparation „...
Page 250 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points „ Before working, make sure that the refrigerant Warning gas is empty in the circuit. Be careful not to get yourself „ Be sure to apply nitrogen burnt with the pipes and other replacement when parts that are heated by the heating up the brazed...
Page 251 Outdoor Unit - RXL25G2V1B SiENBE04-925_A Step Procedure Points Note: „ Do not use a metal saw for cutting pipes by all means because the sawdust comes into the circuit. „ When withdrawing the pipes, be careful not to pinch them firmly with pliers.
Page 252: Removal Of Compressor
SiENBE04-925_A Outdoor Unit - RXL25G2V1B Removal of Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the terminal Terminal cover cover. (R8195) Disconnect the lead Red (U) wires of the compressor.
Page 253 Outdoor Unit - RXL25G2V1B SiENBE04-925_A Step Procedure Points Remove the protection Protection bushing bushing. (R8199) Remove the 2 nuts of the compressor. Warning (R0265) Be careful not to get yourself „ Before working, make burnt with the pipes and other sure that the refrigerant parts that are heated by the gas is empty in the circuit.
Page 254 SiENBE04-925_A Outdoor Unit - RXL25G2V1B Step Procedure Points Lift the compressor up Cautions for restoration to remove. 1. Restore the piping by non- oxidation brazing. 2. It is required to prevent the carbonization of the oil inside the four way valve and the deterioration of the gaskets affected by heat.
Page 255: Outdoor Unit - Rxl35G2V1B
Outdoor Unit - RXL35G2V1B SiENBE04-925_A 5. Outdoor Unit - RXL35G2V1B Removal of Outer Panels Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the panels. Remove the 4 screws Top panel and lift the top panel.
Page 256 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points „ Slide the discharge grille Remove the 4 screws and remove the upwards and remove it. discharge grille. Discharge grille (R5245) „ The discharge grille has 4 hooks. Remove the 6 screws of the front panel.
Page 257 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points „ Lift the front panel while Unfasten the left side hooks, and then the pushing the left side panel right side hook. inwards. Remove the front panel. (R9376) „ Lift the front panel and unfasten the right side hook.
Page 258 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points 2. Remove the stop valve cover. Remove the screw of the stop valve cover. Stop valve cover (R5252) Pull down the stop valve cover to unfasten the hooks and remove (R9379) „ The stop valve cover has 6 hooks.
Page 259: Removal Of Outdoor Fan / Fan Motor
Outdoor Unit - RXL35G2V1B SiENBE04-925_A Removal of Outdoor Fan / Fan Motor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the electrical box Preparation „...
Page 260 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points (R5258) 2. Remove the fan motor. Detach the clamp and disconnect the [S70] connector for the fan motor [S70]. (R9383) Release the fan motor lead wire from the 7 hooks. Fan motor lead wire (R9384) Removal Procedure...
Page 261 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points „ The screw has reverse Remove the washer- fitted nut of the outdoor winding. „ Nut size: M6 fan. 10 mm (R12236) Outdoor fan (R5262) „ When reassembling, align mark of the outdoor fan D-cut with D-cut section of the motor shaft.
Page 262 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points „ When reassembling, put the Release the fan motor lead wire from the 2 fan motor lead wire through hooks and pull the fan the back of the fan motor (so motor out. as not to be entangled with the outdoor fan).
Page 263: Removal Of Electrical Box
Outdoor Unit - RXL35G2V1B SiENBE04-925_A Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the 2 screws Preparation „ Remove the top panel and of the shield plate.
Page 264 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points Disconnect the 2 earth wires. Earth wires (R9391) Remove the 3 screws of the right side panel. Right side panel (R9392) Remove the screw of the electrical box. (R9393) Removal Procedure...
Page 265 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points Disconnect the 2 relay connectors of the drain pan heater. (R9394) „ When reassembling, insert Unfasten the hooks and remove the right side the 2 hooks of the lower part panel. and the 1 hook of the upper Hook back.
Page 266 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points Cut the clamp. (R9397) Detach the 2 wire clamps. (R9398) Disconnect the connectors of the front [S40] [S20] [S80] [S90] side. [S20]: electronic expansion valve coil [S40]: overload protector [S80]: four way valve coil [S90]: thermistors (R5275)
Page 267 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points Detach the clamp and release the thermistor Clamp Hook lead wires from the hook. (R9400) Remove the screw. (R9401) Release the outdoor temperature thermistor. (R9402) Release the harness of the outdoor temperature thermistor from the hook.
Page 268 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points Lift and remove the electrical box. Electrical box (R9404) Removal Procedure...
Page 269: Removal Of Pcb
Outdoor Unit - RXL35G2V1B SiENBE04-925_A Removal of PCB Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the cover of Preparation „ Remove the electrical box the electrical box.
Page 270 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points Unfasten the hook on the right. Open the terminal board. Disconnect the 1: Black harnesses. 2: White 3: Red L1: Black L2: Brown N1: White N2: Blue (R5285) Disconnect the 2 connectors for the [HR1] reactor [HR1] [HR2].
Page 271 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points Remove the 3 screws of the main PCB. Main PCB (R5287) Unfasten the 4 hooks. Hooks (R5288) „ Refer to page 18 for detail. Lift up and remove the main PCB. Main PCB (R5289) Removal Procedure...
Page 272: Removal Of Drain Pan Heater
SiENBE04-925_A Outdoor Unit - RXL35G2V1B Removal of Drain Pan Heater Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the drain pan heater. Cut the clamp. (R9406) Remove the screw of the mounting clamp.
Page 273 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points Cut the clamp. (R9352) Remove the 3 screws Left side panel and remove the left side panel. (R12307) The fuses are inside the drain pan heater. Fuse (R9354) (R9355) Removal Procedure...
Page 274: Removal Of Sound Blanket / Thermistors
SiENBE04-925_A Outdoor Unit - RXL35G2V1B Removal of Sound Blanket / Thermistors Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the sound blanket (back). Sound blanket (back) „...
Page 275 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points Remove the sound Sound blanket blanket (top lower). (top lower) (R11398) Remove the sound blanket (inner). Sound blanket (inner) (R5296) „ Be careful not to lose the clip Release the discharge pipe thermistor. for the thermistor.
Page 276: Removal Of Four Way Valve
SiENBE04-925_A Outdoor Unit - RXL35G2V1B Removal of Four Way Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the screw and remove the four way Warning valve coil.
Page 277: Removal Of Electronic Expansion Valve
Outdoor Unit - RXL35G2V1B SiENBE04-925_A Removal of Electronic Expansion Valve Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Pull out the electronic expansion valve coil. Electronic expansion valve coil (R2737) Remove the sheets of...
Page 278: Removal Of Compressor
SiENBE04-925_A Outdoor Unit - RXL35G2V1B Removal of Compressor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the terminal cover. Terminal cover (R5302) Disconnect the lead wires of the compressor.
Page 279 Outdoor Unit - RXL35G2V1B SiENBE04-925_A Step Procedure Points Release the clamp with pliers to detach the compressor lead wires. Remove the putty. „ Before working, make sure that the refrigerant Warning gas is empty in the circuit. „ Be sure to apply nitrogen Be careful not to get yourself burnt with the pipes and other replacement when...
Page 280 SiENBE04-925_A Outdoor Unit - RXL35G2V1B Step Procedure Points Remove the 2 nuts of Cautions for restoration the compressor. 1. Restore the piping by non- oxidation brazing. 2. It is required to prevent the carbonization of the oil inside the four way valve and the deterioration of the gaskets affected by heat.
Page 281: Part 8 Trial Operation And Field Settings
SiENBE04-925_A Part 8 Trial Operation and Field Settings 1. Trial Operation ..................267 2. Field Settings ..................268 2.1 When 2 Units are Installed in 1 Room..........268 2.2 Standby Electricity Saving..............269 2.3 Jumper and Switch Settings..............270 3. Application of Silicon Grease to a Power Transistor and a Diode Bridge .271 Trial Operation and Field Settings...
Page 282: Trial Operation
SiENBE04-925_A Trial Operation 1. Trial Operation Outline 1. Measure the supply voltage and make sure that it falls in the specified range. 2. Trial operation should be carried out in either cooling or heating mode. 3. Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as louver movement, are working properly.
Page 283: Field Settings
Field Settings SiENBE04-925_A 2. Field Settings When 2 Units are Installed in 1 Room When 2 indoor units are installed in 1 room, 1 of the 2 pairs of indoor unit and infrared remote control can be set for different address. Both the indoor unit PCB and the infrared remote control need alteration.
Page 284: Standby Electricity Saving
SiENBE04-925_A Field Settings Standby Electricity Saving Outline 20/25 Class Only This function turns power supply OFF to the outdoor unit and sets the indoor unit into energy- saving mode, thus reducing the power consumption of the air conditioner. Detail For 20 class models, following procedure is required for turning ON the function. 1.
Page 285: Jumper And Switch Settings
Field Settings SiENBE04-925_A Jumper and Switch Settings Jumper Function When connected When cut (factory set) Fan speed setting Fan speed setting ; Fan rpm is set to “0” (on indoor unit PCB) when compressor Remote control <Fan stop> stops for thermostat setting OFF.
Page 286: Application Of Silicon Grease To A Power Transistor And A Diode Bridge
SiENBE04-925_A Application of Silicon Grease to a Power Transistor and a Diode Bridge 3. Application of Silicon Grease to a Power Transistor and a Diode Bridge Applicable All outdoor units using inverter type compressor for room air conditioner. Models When the printed circuit board (PCB) of an outdoor unit is replaced, it is required that silicon grease (*1) is certainly applied to the heat radiation part (the contact point to the radiation fin) of the power transistor and diode bridge.
Page 287: Part 9 Appendix
SiENBE04-925_A Part 9 Appendix 1. Piping Diagrams..................273 1.1 Indoor Unit....................273 1.2 Outdoor Unit ..................274 2. Wiring Diagrams..................276 2.1 Indoor Unit....................276 2.2 Outdoor Unit ..................276 Appendix...
Page 288: Piping Diagrams
SiENBE04-925_A Piping Diagrams 1. Piping Diagrams Indoor Unit FTXL20/25G2V1B FTXL35G2V1B INDOOR UNIT INDOOR UNIT 6.4CuT 6.4CuT HEAT EXCHANGER HEAT EXCHANGER THERMISTOR THERMISTOR CROSS FLOW FAN CROSS FLOW FAN ON HEAT EXCH. ON HEAT EXCH. FIELD PIPING FIELD PIPING 6.4CuT 6.4CuT FAN MOTOR FAN MOTOR FIELD PIPING...
Page 289: Outdoor Unit
Piping Diagrams SiENBE04-925_A Outdoor Unit RXL20G2V1B, RXL20G2V1B9 OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER THERMISTOR 7.0CuT 7.0CuT HEAT EXCHANGER MOTOR OPERATED THERMISTOR VALVE 4.8CuT 6.4CuT 6.4CuT 4.8CuT MUFFLER MUFFLER WITH WITH FILTER FILTER PROPELLER FAN 9.5CuT MUFFLER WITH FILTER FOUR WAY FIELD PIPING VALVE ON:HEATING...
Page 290 SiENBE04-925_A Piping Diagrams RXL35G2V1B OUTDOOR UNIT 7.9CuT HEAT EXCHANGER OUTDOOR AIR TEMPERATURE THERMISTOR 7.9CuT 7.9CuT 7.9CuT 12.7CuT 7.9CuT CAPILLARY TUBE 1 7.9CuT 4.0CuT MUFFLER 7.9CuT WITH 7.9CuT 4.0CuT 7.9CuT REFRIGERANT FLOW FILTER CAPILLARY TUBE 2 6.4CuT 7.9CuT COOLING CAPILLARY TUBE 3 4.0CuT HEATING HEAT...
Page 291: Wiring Diagrams
Wiring Diagrams SiENBE04-925_A 2. Wiring Diagrams Indoor Unit FTXL20/25/35G2V1B FIELD WIRING. PCB3 PCB1 RECTIFIER 3.15A LED1 OUTDOOR LED2 CAUTION LED3 TRANSMISSION NOTE THAT OPERATION WILL CIRCUIT RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN. t°...
Page 292 SiENBE04-925_A Wiring Diagrams RXL20G2V1B9 FIELD WIRING. MRM20 IPM1 indoor Z3C AC1 MRM10 C119 MR30 3.15A PCB2 3.15A W V U IPM2 MR30_A MR30_B MRCW S100 PCB1 X11A t° DRAIN PAN HEATER outdoor NOTE t° t° t° 1.REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. S110 X12A C5, C6, C119...
Page 293 Wiring Diagrams SiENBE04-925_A RXL35G2V1B E2 MRM20 POWER SUPPLY 30A V2 MRM10 S100 S101 X11A TO INDOOR UNIT 3.15A t° PCB1 MRC / W DRAIN PAN HEATER SHEET METAL 1 S90 6 S101 indoor FIELD WIRING t° t° t° S102 PCB2 R3T R2T R1T LED A (OUTDOOR) (DISCHARGE)
Page 294 Specifications are subject to change without environment. This challenge demands the eco design prior notice. Daikin Europe N.V. explicitly rejects any liability for any direct or and development of a wide range of products and an indirect damage, In the broadest sense, arising from or related to the use energy management system, resulting in energy and/or interpretation of this publication.

This manual is also suitable for:

Ftxl25g2v1b Rxl20g2v1b Rxl20g2v1b9 Ftxl35g2v1b Rxl25g2v1b Rxl35g2v1b

Daikin FTXL20G2V1B Service Manual

Part 1 List of Functions

Part 2 Specifications

Part 3 Printed Circuit Board Connector Wiring Diagram

Part 7 Removal Procedure

Part 8 Trial Operation and Field Settings

Part 9 Appendix

Quick Links

Troubleshooting

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Summary of Contents for Daikin FTXL20G2V1B

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Table of Contents