Page 1 SiBE061121 Service Manual Inverter Pair Floor Standing Type K-Series [Applied Models] Inverter Pair : Heat Pump...
Page 2 SiBE061121 Inverter Pair Floor Standing Type K-Series Heat Pump Indoor Unit FVXG25K2V1B FVXG35K2V1B FVXG50K2V1B Outdoor Unit RXG25K2V1B RXG35K2V1B RXG50K2V1B Table of Contents...
Page 3: Table Of Contents
SiBE061121 1. Introduction .................... vi 1.1 Safety Cautions ..................vi 1.2 Used Icons ....................x Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............3 1. Specifications ..................4 Part 3 Printed Circuit Board Connector Wiring Diagram ..... 6 1.
Page 4 SiBE061121 2.1 Names of Parts..................46 2.2 Preparation before Operation..............50 2.3 AUTO · DRY · COOL · HEAT · FAN Operation ........52 2.4 RADIANT Operation................53 2.5 Temperature Setting................54 2.6 Adjusting the Airflow Direction and Rate ..........55 2.7 POWERFUL Operation ................57 2.8 OUTDOOR UNIT QUIET Operation............58 2.9 ECONO Operation .................59 2.10 OFF TIMER Operation ................60 2.11 ON TIMER Operation ................61...
Page 5 SiBE061121 5.2 Fan Motor Connector Check ..............122 5.3 Power Supply Waveforms Check............122 5.4 Electronic Expansion Valve Coil Check ..........123 5.5 Four Way Valve Performance Check ...........124 5.6 Inverter Unit Refrigerant System Check..........124 5.7 “Inverter Checker” Check ..............125 5.8 Rotation Pulse Check on the Outdoor Unit PCB ........127 5.9 Installation Condition Check..............128 5.10 Discharge Pressure Check..............128 5.11 Outdoor Fan System Check ..............129...
Page 6 SiBE061121 4.2 Standby Electricity Saving..............225 4.3 Jumper and Switch Settings..............225 5. Application of Silicon Grease to a Power Transistor and a Diode Bridge ..................226 Part 9 Appendix................. 227 1. Piping Diagrams..................228 1.1 Indoor Unit....................228 1.2 Outdoor Unit ..................229 2. Wiring Diagrams..................230 2.1 Indoor Unit....................230 2.2 Outdoor Unit ..................231 Table of Contents...
Page 7: Introduction
SiBE061121 Introduction 1. Introduction Safety Cautions Cautions and Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “ Warning” and “ Caution”. The “ Warning” Warnings items are especially important since they can lead to death or serious injury if they are not followed closely.
Page 8 Introduction SiBE061121 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 9 SiBE061121 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 10 Introduction SiBE061121 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 11: Used Icons
SiBE061121 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 12: Part 1 List Of Functions
SiBE061121 Part 1 List of Functions 1. Functions....................2 List of Functions...
Page 13: Functions
SiBE061121 Functions 1. Functions Category Functions Category Functions Basic Inverter (with Inverter Power Control) Health & Air-Purifying Filter — — Function Clean Operation Limit for Cooling (°CDB) Photocatalytic Deodorizing Filter — — ~ 46 ~ 46 –15 –15 Air-Purifying Filter with Photocatalytic Operation Limit for Heating (°CWB) —...
Page 14: Part 2 Specifications
SiBE061121 Part 2 Specifications 1. Specifications ..................4 Specifications...
Page 15: Specifications
SiBE061121 Specifications 1. Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FVXG25K2V1B FVXG35K2V1B Model RXG25K2V1B RXG35K2V1B Outdoor Unit Cooling Heating Cooling Heating 2.5 (1.3 ~ 3.0) 3.4 (1.3 ~ 4.5) 3.5 (1.4 ~ 3.8) 4.5 (1.4 ~ 5.0) Capacity Rated (Min.
Page 16 Specifications SiBE061121 50 Hz, 220 - 230 - 240 V Indoor Unit FVXG50K2V1B Model RXG50K2V1B Outdoor Unit Cooling Heating 5.0 (1.7 ~ 5.6) 5.8 (1.7 ~ 8.1) Capacity Rated (Min. ~ Max.) Btu/h 17,100 (5,800 ~ 19,100) 19,800 (5,800 ~ 27,600) kcal/h 4,300 (1,460 ~ 4,820) 4,990 (1,460 ~ 6,970)
Page 17: Part 3 Printed Circuit Board Connector Wiring Diagram
SiBE061121 Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................7 2. Outdoor Unit..................10 2.1 RXG25/35K2V1B ...................10 2.2 RXG50K2V1B ..................12 Printed Circuit Board Connector Wiring Diagram...
Page 18: Indoor Unit
Indoor Unit SiBE061121 1. Indoor Unit PCB (1): Main PCB Connectors and Other Parts 1) S1 Connector for fan motor 2) S2 Connector for terminal board 3) S6 Connector for swing motor 4) S21 Connector for centralized control (HA) 5) S26 Connector for service PCB 6) S30 Connector for indoor electronic expansion valve coil (motor operated...
Page 19 SiBE061121 Indoor Unit PCB Detail PCB (1): Main PCB LED A 2P273247-1 Printed Circuit Board Connector Wiring Diagram...
Page 20 Indoor Unit SiBE061121 PCB (2): Display PCB 3P273252-1 PCB (3): Service PCB S2W-1 3P273254-1 Printed Circuit Board Connector Wiring Diagram...
Page 21: Outdoor Unit
SiBE061121 Outdoor Unit 2. Outdoor Unit RXG25/35K2V1B 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 6) FU1...
Page 22 Outdoor Unit SiBE061121 PCB Detail PCB (1): Filter PCB E1, E2 (on main PCB) 3P254234-1 PCB (2): Main PCB U VW LED A S100 S50 2P254206-9 PCB (3): Forced Cooling Operation Switch PCB S110 3P255755-1 Printed Circuit Board Connector Wiring Diagram...
Page 23: Rxg50K2V1B
SiBE061121 Outdoor Unit RXG50K2V1B Connectors and PCB (1): Main PCB Other Parts 1) S10 Connector for terminal board (indoor - outdoor transmission) 2) S20 Connector for outdoor 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 24 Outdoor Unit SiBE061121 PCB Detail PCB (1): Main PCB S101 2P282217-1 PCB (2): Service Monitor PCB LED A SW4-C S102 3P169059-1 Printed Circuit Board Connector Wiring Diagram...
Page 25: Part 4 Function And Control
SiBE061121 Part 4 Function and Control 1. Main Functions..................15 1.1 Temperature Control ................15 1.2 Frequency Principle................15 1.3 Airflow Direction Control.................17 1.4 Fan Speed Control for Indoor Unit ............18 1.5 RADIANT Operation................19 1.6 Program Dry Operation ................21 1.7 Automatic Operation................22 1.8 Thermostat Control.................23 1.9 NIGHT SET Mode ..................24 1.10 ECONO Operation .................25 1.11 Inverter POWERFUL Operation .............26...
Page 26: Main Functions
Main Functions SiBE061121 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer Target temperature Room thermistor temperature...
Page 27 SiBE061121 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 28: Airflow Direction Control
Main Functions SiBE061121 Airflow Direction Control Wide-Angle The louvers, made of elastic synthetic resin, provide a wide range of airflow that guarantees a comfortable air distribution. Louvers You can adjust the position of the louvers. (R14632) (R14633) Auto-Swing The swinging range of the flap is the same in any operation mode. (R14634) Function and Control...
Page 29: Fan Speed Control For Indoor Unit
SiBE061121 Main Functions Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.
Page 30: Radiant Operation
Main Functions SiBE061121 RADIANT Operation The RADIANT operation has 2 operation modes. RADIANT 1: RADIANT operation with heating RADIANT 2: RADIANT operation only 1.5.1 Indoor Electronic Expansion Valve (Motor Operated Valve) Control Initializing with The indoor electronic expansion valve is initialized when turning on the power. Power ON Opening Limit Opening limit control limits the opening of the indoor electronic expansion valve in order to keep...
Page 31: Indoor Unit Fan Control
SiBE061121 Main Functions 1.5.2 Indoor Unit Fan Control The movement of the indoor unit fan is different whether in RADIANT 1 or RADIANT 2. RADIANT 1 starts. Room temperature Set temperature Note: The only difference between RADIANT 1 and RADIANT 2 is the Room temperature movement of the indoor unit fan.
Page 32: Program Dry Operation
Main Functions SiBE061121 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. Detail The microcomputer automatically sets the temperature and airflow rate. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones.
Page 33: Automatic Operation
SiBE061121 Main Functions Automatic Operation Outline Automatic Cooling / Heating Function When the automatic operation mode is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
Page 34: Thermostat Control
Main Functions SiBE061121 Thermostat Control Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON Condition The temperature difference returns to the zone C after being in the zone A. The system resumes from defrost control in any zones except A.
Page 35: Night Set Mode
SiBE061121 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 36: Econo Operation
Main Functions SiBE061121 1.10 ECONO Operation 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 37: Inverter Powerful Operation
SiBE061121 Main Functions 1.11 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 the [POWERFUL] button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
Page 38: Other Functions
Main Functions SiBE061121 1.12 Other Functions 1.12.1 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 39 SiBE061121 Main Functions 1.12.7 Brightness Setting of the Indoor Unit Display Each time you press the [Brightness] button on the remote controller, the brightness of the indoor unit display changes to “high”, “low”, or “off”. Refer to the operation manual for details. Indoor unit display Timer lamp (yellow) Operation lamp...
Page 40: Function Of Thermistor
Function of Thermistor SiBE061121 2. Function of Thermistor Outdoor electronic expansion valve Indoor electronic (4) φ 4 expansion valve (Motor operated valve) Radiant panel Four way valve (4) φ 6 Compressor (R14640) (1) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe Exchanger temperature.
Page 41: Control Specification
SiBE061121 Control Specification 3. Control Specification Mode Hierarchy Outline There are 3 modes; the one is the normal operation mode and the others are the forced operation mode and the power transistor test mode for installation and servicing. Detail Air conditioner control mode Forced operation mode Forced cooling operation Power transistor test mode...
Page 42: Frequency Control
Control Specification SiBE061121 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 43 SiBE061121 Control Specification Indoor Frequency Command (∆D signal) The difference between the room thermistor temperature and the target temperature is taken as the “∆D signal” and is used for frequency command. ∆D ∆D ∆D ∆D Temperature Temperature Temperature Temperature difference signal difference signal...
Page 44: Controls At Mode Changing / Start-Up
Control Specification SiBE061121 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. Detail 25/35 Class Outdoor temperature ≥...
Page 45 SiBE061121 Control Specification 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 as the four way valve coil switches from ON to OFF when the heating is stopped, the OFF delay switch of the four way valve is carried out after the operation stopped.
Page 46: Discharge Pipe Temperature Control
Control Specification SiBE061121 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 rising further. Detail Stop zone A˚C...
Page 47: Input Current Control
SiBE061121 Control Specification Input Current Control Outline The microcomputer calculates the input current while 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 over the lower limit of control of four way valve operation compensation.
Page 48: Freeze-Up Protection Control
Control Specification SiBE061121 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 49: Outdoor Fan Control
SiBE061121 Control Specification Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control while defrosting The outdoor fan is turned OFF while defrosting.
Page 50: Defrost Control
Control Specification SiBE061121 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 51: Outdoor Electronic Expansion Valve Control
SiBE061121 Control Specification 3.11 Outdoor Electronic Expansion Valve Control Outline The following items are included in the outdoor electronic expansion valve control. Outdoor electronic expansion valve is fully closed. 1. Outdoor electronic expansion valve is fully closed when turning on the power. 2.
Page 52 Control Specification SiBE061121 3.11.1 Fully Closing with Power ON The outdoor 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 Equalizing Control When the compressor is stopped, the pressure equalization control is activated. The outdoor electronic expansion valve opens, and develops the pressure equalization.
Page 53 SiBE061121 Control Specification 3.11.7 Control for Disconnection of the Discharge Pipe Thermistor Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensing temperature. If the discharge pipe thermistor is disconnected, the outdoor electronic expansion valve opens according to the outdoor temperature and the operation frequency, and operates for a specified time, and then stops.
Page 54: Malfunctions
Control Specification SiBE061121 3.12 Malfunctions 3.12.1 Detection of Overcurrent and Overload Outline An excessive output current is detected and the OL temperature is observed to protect the compressor. Detail If the OL (compressor head) temperature exceeds 120 ~ 130°C, the system shuts down the compressor.
Page 55: Part 5 Operation Manual
SiBE061121 Part 5 Operation Manual 1. System Configuration................45 2. Operation Manual..................46 2.1 Names of Parts..................46 2.2 Preparation before Operation..............50 2.3 AUTO · DRY · COOL · HEAT · FAN Operation ........52 2.4 RADIANT Operation................53 2.5 Temperature Setting................54 2.6 Adjusting the Airflow Direction and Rate ..........55 2.7 POWERFUL Operation ................57 2.8 OUTDOOR UNIT QUIET Operation............58 2.9 ECONO Operation .................59...
Page 56: System Configuration
System Configuration SiBE061121 1. System Configuration After installation and trial operation of the room air conditioner are completed, the air conditioner should be handled and operated as described in the following pages. Every user should be informed on the correct method of operation and how to check if it can cool (or heat) well, and how to use it efficiently.
Page 57: Operation Manual
SiBE061121 Operation Manual 2. Operation Manual Names of Parts Name of Parts Indoor Unit Louvers (vertical blades) • The louvers are inside of the air outlet. Page 14 Air outlet Flap (horizontal blade) Page 14 Radiant panel Front panel Air inlet Room temperature sensor •...
Page 58 Operation Manual SiBE061121 Open the front panel Front panel stopper Strings CAUTION • The surface of the radiant panel becomes very hot during RADIANT operation. Do not touch the panel of the main unit directly. After the operation is complete, do not remove or care and clean the panel until the surface Air filter (upper) temperature of the panel decreases.
Page 59 SiBE061121 Operation Manual Name of Parts Remote Controller Signal transmitter Receiver Display (LCD) • It displays the current settings. (In this illustration, each section is shown with its displays on for the purpose of explanation.) • To use the remote controller, aim the transmitter at the indoor unit.
Page 60 Operation Manual SiBE061121 Open the front cover MODE selector button • It selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 11 ECONO button • ECONO operation. Page 18 SWING button • Adjusting the airflow direction. Page 14 QUIET button • OUTDOOR UNIT QUIET operation.
Page 61: Preparation Before Operation
SiBE061121 Operation Manual Preparation before Operation Preparation before Operation To set the batteries Position – correctly! Slide the front cover to take it off. Set two dry batteries AAA.LR03 (alkaline). Set the front cover as before. To fix the remote controller holder on the wall Remote controller Choose a place from where the signals reach the unit.
Page 62 Operation Manual SiBE061121 Turn the breaker on • After the power is turned on, the flap of the indoor unit opens and closes once to set the reference position. To set the clock Press • “ ” is displayed on the LCD. •...
Page 63: Auto · Dry · Cool · Heat · Fan Operation
SiBE061121 Operation Manual AUTO · DRY · COOL · HEAT · FAN Operation 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.
Page 64: Radiant Operation
Operation Manual SiBE061121 RADIANT Operation RADIANT Operation The RADIANT operation provides a comfortable environment with quiet and currentless heating operation in addition to the HEAT operation mode. The RADIANT operation has 2 operation modes. To start RADIANT operation Press and select an HEAT operation. •...
Page 65: Temperature Setting
SiBE061121 Operation Manual Temperature Setting Temperature Setting To change the temperature setting Press • The displayed items on the LCD will change whenever either one of the buttons is pressed. HEAT or RADIANT COOL operation AUTO operation DRY or FAN operation operation 18-32˚C 10-30˚C...
Page 66: Adjusting The Airflow Direction And Rate
Operation Manual SiBE061121 Adjusting the Airflow Direction and Rate Adjusting the Airflow Direction and Rate You can adjust the airflow direction to increase your comfort. To start auto swing Upper and lower airflow direction Press • “ ” is displayed on the LCD. •...
Page 67 SiBE061121 Operation Manual Adjusting the Airflow Direction and Rate To adjust the airflow rate setting Press • Each pressing of advances the airflow rate setting in sequence. Auto Indoor unit quiet Middle low High Middle high Middle • When the airflow is set to “ ”, indoor unit quiet operation will start and the noise from the unit will become quieter.
Page 68: Powerful Operation
Operation Manual SiBE061121 POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximises the cooling (heating) effect in any operation mode. You can get the maximum capacity. To start POWERFUL operation Press during operation. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the previous settings which were used before POWERFUL operation.
Page 69: Outdoor Unit Quiet Operation
SiBE061121 Operation Manual OUTDOOR UNIT QUIET Operation 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 the night. To start OUTDOOR UNIT QUIET operation Press •...
Page 70: Econo Operation
Operation Manual SiBE061121 ECONO Operation 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. To start ECONO operation Press during operation.
Page 71: Off Timer Operation
SiBE061121 Operation Manual 2.10 OFF TIMER Operation OFF 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 72: On Timer Operation
Operation Manual SiBE061121 2.11 ON TIMER Operation ON TIMER Operation To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. Page 10 Press • “ ” is displayed on the LCD. •...
Page 73: Weekly Timer Operation
SiBE061121 Operation Manual 2.12 WEEKLY TIMER Operation 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 [Example] The same timer settings are made for the week from Monday through Friday while different timer settings are made for the weekend.
Page 74 Operation Manual SiBE061121 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. Page 10 Program 1 Program 2 Program 3 Program 4 [Monday] 25˚C...
Page 75 SiBE061121 Operation Manual WEEKLY TIMER Operation Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10 minute intervals. • To return to the ON/OFF TIMER mode setting, press • Go to step when setting the OFF TIMER.
Page 76 Operation Manual SiBE061121 Copy mode • A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied. Program 1 Program 2 Program 3 Program 4 [Monday] 25˚C 27˚C...
Page 77 SiBE061121 Operation Manual WEEKLY TIMER Operation Confirming a reservation • The reservation can be confirmed. Setting Displays Normal Confirmation Press • The day of the week and the reservation number of the current day will be displayed. Press to select the day of the week and the reservation number to be confirmed.
Page 78 Operation Manual SiBE061121 To delete reservations The individual reservation Press • The day of the week and the reservation number will be displayed. Press to select the day of the week and the reservation number to be deleted. Press • “ ”...
Page 79: Quick Reference
SiBE061121 Operation Manual 2.13 Quick Reference Quick Reference 3P276869-1 Operation Manual...
Page 80: Part 6 Service Diagnosis
SiBE061121 Part 6 Service Diagnosis 1. Troubleshooting with LED ..............71 1.1 Indoor Unit....................71 1.2 Outdoor Unit ...................71 2. Problem Symptoms and Measures ............72 3. Service Check Function ................73 4. Troubleshooting ..................76 4.1 Error Codes and Description ..............76 4.2 Indoor Unit PCB Abnormality ..............77 4.3 Freeze-up Protection Control or Heating Peak-cut Control....79 4.4 Fan Motor (DC Motor) or Related Abnormality........81 4.5 Radiant Panel Temperature Rise, Indoor Electronic Expansion Valve...
Page 81 SiBE061121 5.11 Outdoor Fan System Check ..............129 5.12 Main Circuit Short Check..............129 5.13 Capacitor Voltage Check..............130 5.14 Power Module Check ................130 Service Diagnosis...
Page 82: Troubleshooting With Led
Troubleshooting with LED SiBE061121 1. Troubleshooting with LED Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.
Page 83: Problem Symptoms And Measures
SiBE061121 Problem Symptoms and Measures 2. Problem Symptoms and Measures Symptom Check Item Details of Measure Reference Page The unit does not operate. Check the power supply. Check if the rated voltage is supplied. — Check the type of the indoor unit. Check if the indoor unit type is compatible with —...
Page 84: Service Check Function
Service Check Function SiBE061121 3. Service Check Function 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature Check Method 1 display screen. Timer cancel button (R14553) < ARC466 Series > 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
Page 85 SiBE061121 Service Check Function Check Method 2 1. Press the center of the [Temp] button and the [Mode] button at the same time. (R11669) is displayed on the LCD. (R11821) 2. Select 5C (service check) with the [Temp] button. 3. Press the [Mode] button to enter the service check mode. (R11672) The left-side number blinks.
Page 86 Service Check Function SiBE061121 5. Diagnose by the sound. beep : The left-side number does not correspond with the error code. two consecutive beeps : The left-side number corresponds with the error code but the right-side number does not. long beep : Both the left-side and right-side numbers correspond with the error code. The numbers indicated when you hear the long beep are the error code.
Page 87: Troubleshooting
SiBE061121 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 88: Indoor Unit Pcb Abnormality
Troubleshooting SiBE061121 Indoor Unit PCB Abnormality Remote Controller Display Method of The system checks if the circuit works properly within the microcomputer of the indoor unit. Malfunction Detection Malfunction The system cannot set the internal settings. Decision Conditions Supposed Wrong models interconnected Causes Defective indoor unit PCB Disconnection of connector...
Page 89 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the combination of the indoor and outdoor unit. Match the compatible models. ∗ To secure the connection, Check the connection of once disconnect the connector connectors (See Note.).
Page 90: Freeze-Up Protection Control Or Heating Peak-Cut Control
Troubleshooting SiBE061121 Freeze-up Protection Control or Heating Peak-cut Control Remote Controller Display Method of Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated Malfunction according to the temperature detected by the indoor heat exchanger thermistor. Detection Heating peak-cut control During heating operation, the temperature detected by the indoor heat exchanger thermistor...
Page 91 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Check the air passage. Refer to P.121 Is there any short circuit? Provide sufficient air passage. Check the air filter.
Page 92: Fan Motor (Dc Motor) Or Related Abnormality
Troubleshooting SiBE061121 Fan Motor (DC Motor) or Related Abnormality Remote Controller Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Malfunction Detection Malfunction The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
Page 93 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.02 Turn off the power supply Refer to P.122 and rotate the fan by hand. Does the fan rotate Replace the fan smoothly? motor.
Page 94: Radiant Panel Temperature Rise, Indoor Electronic Expansion Valve (Motor Operated Valve) Abnormality, Freeze-Up Protection Control
Troubleshooting SiBE061121 Radiant Panel Temperature Rise, Indoor Electronic Expansion Valve (Motor Operated Valve) Abnormality, Freeze-up Protection Control Remote Controller Display Method of Radiant panel temperature rise Malfunction During RADIANT operation, high temperature control (e.g., operation halt, indoor electronic expansion valve closure) is activated according to the temperature detected by the radiant Detection panel thermistors.
Page 95 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 ∗ When the outdoor temperature is below the Check the operation condition. lower limit for cooling operation (10˚C), the Refer to P.121 freeze-up protection control is activated and the cooling operation stops.
Page 96: Thermistor Or Related Abnormality (Indoor Unit)
Troubleshooting SiBE061121 Thermistor or Related Abnormality (Indoor Unit) C4 , C9 , CE Remote Controller 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 Supposed...
Page 97: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)
SiBE061121 Troubleshooting Signal Transmission Error (between Indoor Unit and Outdoor Unit) Remote Controller Display Method of The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked whether it is normal. Malfunction Detection Malfunction The data sent from the outdoor unit cannot be received normally, or the content of the data is abnormal.
Page 98 Troubleshooting SiBE061121 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Check the power supply voltage. Refer to P.122 Voltage as rated? Correct the power supply. Check the indoor unit - outdoor unit connection wires.
Page 99: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)
SiBE061121 Troubleshooting Unspecified Voltage (between Indoor Unit and Outdoor Unit) Remote Controller Display Method of The supply power is detected for its requirements (different from pair type and multi type models) by the indoor / outdoor transmission signal. Malfunction Detection Malfunction Pair type and multi type models are interconnected.
Page 100: Outdoor Unit Pcb Abnormality
Troubleshooting SiBE061121 Outdoor Unit PCB Abnormality 4.9.1 25/35 Class Remote Controller Display Method of The system follows the microprocessor program as specified. Malfunction The system checks to see if the zero-cross signal comes in properly. Detection Malfunction The microprocessor program runs out of control. The zero-cross signal is not detected.
Page 101 SiBE061121 Troubleshooting 4.9.2 50 Class Remote Controller Display Method of Detection within the program of the microcomputer Malfunction Detection Malfunction The program of the microcomputer is in abnormal running order. Decision Conditions Supposed Defective outdoor unit PCB Noise Causes Momentary fall of voltage Momentary power failure Troubleshooting Be sure to turn off the power switch before connecting or disconnecting...
Page 102: Ol Activation (Compressor Overload)
Troubleshooting SiBE061121 4.10 OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection Malfunction If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Decision ∗...
Page 103: Compressor Lock
SiBE061121 Troubleshooting 4.11 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the compressor running condition through the Malfunction position detection circuit. Detection Malfunction <25/35 class> Operation stops due to overcurrent. Decision If the error repeats, the system is shut down. Conditions Reset condition: Continuous run for about 11 minutes without any other error <50 class>...
Page 104: Dc Fan Lock
Troubleshooting SiBE061121 4.12 DC Fan Lock Remote Controller Display Method of An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Malfunction Detection Malfunction The fan does not start in 15 ~ 30 seconds (depending on the model) even when the fan motor is running.
Page 105: Input Overcurrent Detection
SiBE061121 Troubleshooting 4.13 Input Overcurrent Detection Remote Controller Display Method of An input overcurrent is detected by checking the input current value with the compressor Malfunction running. Detection Malfunction The following current with the compressor running continues for 2.5 seconds. Cooling / Heating: Above 9.25 ~ 20 A (depending on the model) Decision The upper limit of the current decreases when the outdoor temperature exceeds a certain...
Page 106: Four Way Valve Abnormality
Troubleshooting SiBE061121 4.14 Four Way Valve Abnormality Remote Controller 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 107 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Four way valve coil Correct it. Refer to P.121 disconnected (loose)? Check No.13 Harness out of connector? Refer to P.124 Reconnect it.
Page 108: Discharge Pipe Temperature Control
Troubleshooting SiBE061121 4.15 Discharge Pipe Temperature Control Remote Controller Display Method of An error is determined with the temperature detected by the discharge pipe thermistor. Malfunction Detection Malfunction If the temperature detected by the discharge pipe thermistor rises above A °C, the compressor stops.
Page 109: High Pressure Control In Cooling
SiBE061121 Troubleshooting 4.16 High Pressure Control in Cooling Remote Controller 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 Malfunction The temperature sensed by the outdoor heat exchanger thermistor rises above about 65°C.
Page 110: Compressor System Sensor Abnormality
Troubleshooting SiBE061121 4.17 Compressor System Sensor Abnormality 4.17.1 25/35 Class Remote Controller Display Method of The system checks the DC current before the compressor starts. Malfunction Detection Malfunction The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output converted to voltage value) Decision The DC voltage before compressor start-up is below 50 V.
Page 111 SiBE061121 Troubleshooting 4.17.2 50 Class Remote Controller Display Method of The system checks the power supply voltage and the DC voltage before the compressor starts. Malfunction The system checks the compressor current right after the compressor starts. Detection Malfunction The power supply voltage and the DC voltage is obviously low or high. Decision The compressor current does not run when the compressor starts.
Page 112: Position Sensor Abnormality
Troubleshooting SiBE061121 4.18 Position Sensor Abnormality Remote Controller Display Method of A compressor start-up failure is detected by checking the compressor running condition through Malfunction the position detection circuit. Detection Malfunction If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes (50 class: 5 minutes) without any Decision other error...
Page 113 SiBE061121 Troubleshooting Troubleshooting 25/35 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Refer to P.125 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.128 Voltage as rated? Correct the power supply.
Page 114 Troubleshooting SiBE061121 Troubleshooting 50 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Refer to P.125 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.128 Voltage as rated? Correct the power supply.
Page 115: Dc Voltage / Current Sensor Abnormality (25/35 Class)
SiBE061121 Troubleshooting 4.19 DC Voltage / Current Sensor Abnormality (25/35 Class) Remote Controller Display Method of DC voltage or DC current sensor abnormality is identified based on the compressor running Malfunction frequency and the input current. Detection Malfunction The compressor running frequency is above 52 Hz. If the error repeats, the system is shut down.
Page 116: Ct Or Related Abnormality (50 Class)
Troubleshooting SiBE061121 4.20 CT or Related Abnormality (50 Class) Remote Controller Display Method of A CT or related error is detected by checking the compressor running frequency and CT- Malfunction detected input current. Detection Malfunction The compressor running frequency is more than 55 Hz, and the CT input current is below 0.5 A.
Page 117 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Turn off the power and turn it on Refer to P.125 again. Check No.21 Start operation. Refer to P.130 ∗...
Page 118: Thermistor Or Related Abnormality (Outdoor Unit)
Troubleshooting SiBE061121 4.21 Thermistor or Related Abnormality (Outdoor Unit) H9 , J3 , J6 , P4 Remote Controller 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 Malfunction The thermistor input voltage is above 4.96 V or below 0.04 V with the power on.
Page 119 SiBE061121 Troubleshooting In case of “ H9 ” “ J3 ” “ J6 ” Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Turn on the power again. Refer to P.121 Error displayed Reconnect the connectors...
Page 120: Electrical Box Temperature Rise
Troubleshooting SiBE061121 4.22 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor off. Detection Malfunction With the compressor off, the radiation fin temperature is above A °C. The error is cleared when the radiation fin temperature drops below B °C.
Page 121 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.17 WARNING Turn off the power and turn it on again. To cool the electrical components, Refer to P.128 the outdoor fan starts when the radiation fin temperature rises above C ˚C and stops when it...
Page 122: Radiation Fin Temperature Rise
Troubleshooting SiBE061121 4.23 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is above A °C. The error is cleared when the radiation fin temperature drops below B °C.
Page 123 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.17 Turn off the power and turn it on Refer to P.128 again to start the system. Check No.19 Refer to P.129 Error displayed again?
Page 124: Output Overcurrent Detection
Troubleshooting SiBE061121 4.24 Output Overcurrent Detection Remote Controller Display Method of An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Detection Malfunction A position signal error occurs while the compressor is running. A speed error occurs while the compressor is running.
Page 125 SiBE061121 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output overcurrent after the wires have been disconnected and reconnected for part replacement, check the Refer to P.125 wiring again.
Page 126: Refrigerant Shortage
Troubleshooting SiBE061121 4.25 Refrigerant Shortage Remote Controller 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 lower than the normal value. Detection Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of...
Page 127 SiBE061121 Troubleshooting Refrigerant shortage detection III : (25/35 class only) When the difference of the temperature is lower than K °C, it is regarded as refrigerant shortage. K (°C) room thermistor temperature – indoor heat exchanger temperature Cooling outdoor heat exchanger temperature – outdoor temperature indoor heat exchanger temperature –...
Page 128 Troubleshooting SiBE061121 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.121 Any thermistor Replace them in position. disconnected? ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗...
Page 129: Low-Voltage Detection Or Over-Voltage Detection
SiBE061121 Troubleshooting 4.26 Low-voltage Detection or Over-voltage Detection Remote Controller Display Method of Indoor Unit Malfunction Evaluation of zero-cross detection of power supply by the indoor unit PCB. Detection Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit.
Page 130 Troubleshooting SiBE061121 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Voltage as rated? Correct the power supply. Check the connection of the compressor harness. Loose or Reconnect it.
Page 131: Signal Transmission Error On Outdoor Unit Pcb (50 Class Only)
SiBE061121 Troubleshooting 4.27 Signal Transmission Error on Outdoor Unit PCB (50 Class Only) Remote Controller Display Method of Communication error between microcomputer mounted on the main microcomputer and PM1. Malfunction Detection Malfunction The abnormality is determined when the data sent from the PM1 can not be received for 9 Decision seconds.
Page 132: Check
Check SiBE061121 5. Check Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using a tester. The relationship between normal temperature and resistance is shown in the table and the graphs below.
Page 133: Fan Motor Connector Check
SiBE061121 Check Fan Motor Connector Check Check No.02 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. Check the rotation command voltage (pins 4 - 2). 5.
Page 134: Electronic Expansion Valve Coil Check
Check SiBE061121 Electronic Expansion Valve Coil Check Check No.12 Conduct the followings to check the electronic expansion valve coil (EV). 1. Check to see if the EV connector is correctly connected to the PCB. 2. Turn the power off and on again, and check to see if the EV generate a latching sound. 3.
Page 135: Four Way Valve Performance Check
SiBE061121 Check Four Way Valve Performance Check Check No.13 Turn off the power and turn it on again. ∗ Four way valve coil Start heating operation. Cooling / Dry : No continuity Heating : Continuity voltage at 220 - 240 Replace the outdoor unit VAC with compressor PCB.
Page 136: Inverter Checker" Check
Check SiBE061121 “Inverter Checker” Check Check No.15 Characteristics If an abnormal stop occurs due to compressor startup failure or overcurrent output when using inverter unit, it is difficult to judge whether it is caused by the compressor failure or other failure (control PCB, power module, etc.).
Page 137 SiBE061121 Check Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) When all the LEDs are lit uniformly, the compressor is defective. → Replace the compressor. (2) When the LEDs are not lit uniformly, check the power module. → Refer to Check No.22. (3) If NG in Check No.22, replace the power module (PCB).
Page 138: Rotation Pulse Check On The Outdoor Unit Pcb
Check SiBE061121 Rotation Pulse Check on the Outdoor Unit PCB Check No.16 25/35 class 1. Check that the voltage between the pins 10 - 11 is 15 VDC. 2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 - 12, 10 - 13, when the fan motor is manually rotated once.
Page 139: Installation Condition Check
SiBE061121 Check Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air Change the installation suction and location or direction. discharge area. Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty? exchanger.
Page 140: Outdoor Fan System Check
Check SiBE061121 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor lead wire connector Outdoor fan running? Reconnect the connector. disconnected? Go to Check No. 16. Outdoor fan system is functioning. (R15001) 5.12 Main Circuit Short Check Check No.20 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
Page 141: Capacitor Voltage Check
SiBE061121 Check 5.13 Capacitor Voltage Check Check No.21 Before this check, be sure to check the main circuit for short circuit. With the circuit breaker still on, measure the voltage as the illustration below. Be careful never to touch any live parts. Multimeter (DC voltage range) (R13538)
Page 142: Part 7 Removal Procedure
SiBE061121 Part 7 Removal Procedure 1. Indoor Unit...................132 1.1 Removal of Front Panel................132 1.2 Removal of Air Filters ................133 1.3 Removal of Front Grille ASSY..............134 1.4 Removal of Electrical Box / PCBs ............135 1.5 Removal of Horizontal Blade..............148 1.6 Removal of Swing Motor ..............149 1.7 Removal of Radiant Panel..............150 1.8 Removal of Air Outlet ASSY..............155 1.9 Removal of Drain Pan / Indoor Heat Exchanger ASSY......157...
Page 143: Indoor Unit
SiBE061121 Indoor Unit 1. Indoor Unit Removal of Front Panel Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Appearance feature Indoor unit ON/OFF button (R15015) Open the front panel.
Page 144: Removal Of Air Filters
Indoor Unit SiBE061121 Removal of Air Filters Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Pull down and remove Air filter (upper) the air filters (upper). (R15019) Pull up and remove the air filters (lower).
Page 145: Removal Of Front Grille Assy
SiBE061121 Indoor Unit Removal of Front Grille ASSY 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 5 screws. (R15023) Unfasten the 3 lower hooks and remove the Hook front grille ASSY...
Page 146: Removal Of Electrical Box / Pcbs
Indoor Unit SiBE061121 Removal of Electrical Box / PCBs 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. Remove the screw of the service cover.
Page 147 SiBE061121 Indoor Unit Step Procedure Points Unfasten the hook and Lower: for indoor electronic disconnect the relay expansion valve connector for the indoor electronic expansion valve coil. Hook (R15030) Unfasten the hook and Upper: for fan motor disconnect the relay connector for the fan motor.
Page 148 Indoor Unit SiBE061121 Step Procedure Points The electrical box is now easy to manage. Electrical box (R15033) 2. Remove the main PCB. Remove the 2 screws. (R15034) Remove the electrical box cover. Electrical box cover (R15035) Removal Procedure...
Page 149 SiBE061121 Indoor Unit Step Procedure Points Unfasten the hook of [S6] [S32] [S33] [S34] [S26] each connector. Disconnect the connectors. [S30] [S46] (R15036) [S6]: swing motor [S26]: service PCB [S30]: indoor electronic expansion valve coil [S32]: indoor heat exchanger thermistor [S33]: room temperature thermistor [S34]: radiant panel thermistors...
Page 150 Indoor Unit SiBE061121 Step Procedure Points Disconnect the [FG] connector for the earth [FG]. (R15038) Unfasten the hook and [S1] disconnect the connector for the fan motor [S1]. Hook (R15039) Unfasten the hook and [S2] disconnect the connector for the terminal board [S2].
Page 151 SiBE061121 Indoor Unit Step Procedure Points Remove the main PCB. [S1] [S2] [S30] [S6] [S33] [S26] [FG] [S32] [S34] [S46] (R15042) [S1]: fan motor [S2]: terminal board [S6]: swing motor [S26]: service PCB [S30]: indoor electronic expansion valve coil [S32]: indoor heat exchanger thermistor [S33]: room temperature thermistor...
Page 152 Indoor Unit SiBE061121 Step Procedure Points Unfasten the hook and disconnect the [S27] connector for the main PCB [S27]. (R15045) Hook Remove the service [S27]: for main PCB PCB. [S27] (R15046) 4. Remove the terminal board ASSY. Remove the screw. (R15047) Unfasten the hook with a flat screwdriver.
Page 153 SiBE061121 Indoor Unit Step Procedure Points Release the terminal board ASSY. Terminal board ASSY (R15049) Unfasten the hook. Hook (R15313) Remove the terminal Terminal board board cover. cover (R15314) Release the harnesses from the hook. (R15050) Removal Procedure...
Page 154 Indoor Unit SiBE061121 Step Procedure Points Cut the clamp. (R15051) Unfasten the 2 hooks of Upper (brown): fan motor each connector. Pull Lower (red): electronic out the 2 relay expansion valve connectors. Hook (R15052) Release the 4 terminals with a flat screwdriver. (R15053) Remove the terminal board ASSY.
Page 155 SiBE061121 Indoor Unit Step Procedure Points 5. Remove the display PCB. Use a piece of cloth to Screw cover protect the surface of the Remove the screw (right) indoor unit. cover (right) with a flat screwdriver. (R15055) (R15056) Remove the 2 screws. (R15057) Remove the service cover.
Page 156 Indoor Unit SiBE061121 Step Procedure Points Unfasten the hook and disconnect the relay connector for the display PCB. (R15059) Hook Remove the screw Use a piece of cloth to cover (left) with a flat protect the surface of the screwdriver. indoor unit.
Page 157 SiBE061121 Indoor Unit Step Procedure Points Unfasten the 8 hooks. (R15287) Remove the air outlet cover ASSY. Air outlet cover ASSY (R15061) Turn over the air outlet cover ASSY and cut the clamp. (R15062) Release the harnesses from the hooks. (R15063) Removal Procedure...
Page 158 Indoor Unit SiBE061121 Step Procedure Points Lift up the cover of the Hook lamp cover ASSY with a flat screwdriver. Lamp cover ASSY (R15064) Open the cover. (R15065) Unfasten the hook and Hook remove the display PCB. Display PCB (R15066) Unfasten the hook and [S56] Hook...
Page 159: Removal Of Horizontal Blade
SiBE061121 Indoor Unit Removal of Horizontal Blade Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Open the horizontal blade. Horizontal blade (R15068) Bend the horizontal blade and unfasten the center shaft.
Page 160: Removal Of Swing Motor
Indoor Unit SiBE061121 Removal of Swing Motor 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. (R15072) Remove the swing motor. (R15073) Remove the shaft.
Page 161: Removal Of Radiant Panel
SiBE061121 Indoor Unit Removal of Radiant Panel 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 screw. (R15076) Unfasten the 2 hooks and remove the drip proof cover.
Page 162 Indoor Unit SiBE061121 Step Procedure Points Remove the 2 lower screws on the right and left side of the radiant panel. Remove the 2 upper Radiant screws on the right and panel left side of the radiant panel. Remove the radiant panel.
Page 163 SiBE061121 Indoor Unit Step Procedure Points Remove the 2 screws on the right. (R15085) Remove the right panel. Right panel (R15086) Remove the screw. M4 × 16 (R15087) Removal Procedure...
Page 164 Indoor Unit SiBE061121 Step Procedure Points Remove the piping fixture. Piping fixture (R15088) Remove the screw. (R15089) Remove the single union fixture. Single union fixture (R15129) Removal Procedure...
Page 165 SiBE061121 Indoor Unit Step Procedure Points Remove the cover thermal insulation ASSY (small). Cover thermal insulation ASSY (small) (R15090) Remove the 8 screws Cover thermal insulation ASSY (large) and remove the cover thermal insulation ASSY (large). Remove the 2 screws to remove the mounting plate (right).
Page 166: Removal Of Air Outlet Assy
Indoor Unit SiBE061121 Removal of Air Outlet ASSY Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Unfasten the hook and Preparation disconnect the relay Remove the horizontal blade connector for the swing according to the “Removal of motor.
Page 167 SiBE061121 Indoor Unit Step Procedure Points Turn over the air outlet ASSY and remove the 3 screws. (R15098) Remove the sub air outlet ASSY. Sub air outlet ASSY (R15288) Remove the 3 screws of the sub air outlet ASSY. (R15100) Turn over the sub air outlet ASSY and remove the 3 screws.
Page 168: Removal Of Drain Pan / Indoor Heat Exchanger Assy
Indoor Unit SiBE061121 Removal of Drain Pan / Indoor Heat Exchanger ASSY 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 drain pan. The drip proof sheet is Hook transparent.
Page 169 SiBE061121 Indoor Unit Step Procedure Points Remove the screw of Earth wire the earth wire. (R15136) Cut the clamp. (R15108) Pull out the radiant Take care not to lose the clip panel thermistor (φ 6). of thermistor. Radiant panel thermistor (φ 6) (R15137) Removal Procedure...
Page 170 Indoor Unit SiBE061121 Step Procedure Points Pull out the radiant Take care not to lose the clip panel thermistor (φ 4). of thermistor. Radiant panel thermistor (φ 4) (R15138) Cut the clamp. (R15139) Disconnect the When the pipings are connecting sections of disconnected, protect the the liquid piping and the both openings from entering...
Page 171 SiBE061121 Indoor Unit Step Procedure Points Disconnect the drain Be careful not to wet the hose. floor with drain. Drain hose (R15315) Remove the drain pan. Drain pan (R15142) 2. Remove the indoor heat There is a hook inside the Indoor electronic expansion valve coil exchanger ASSY.
Page 172 Indoor Unit SiBE061121 Step Procedure Points Remove the 2 screws on the left side. Caution When removing or reassembling the indoor heat exchanger, be sure to wear gloves or wrap it with cloth before proceeding to the work. (You may be injured by the fins.) (R15117) Unfasten the 2 hooks...
Page 173: Removal Of Fan Rotor / Fan Motor
SiBE061121 Indoor Unit 1.10 Removal of Fan Rotor / 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 Remove the 3 screws. (R15119) (R15120) (R15121) Removal Procedure...
Page 174 Indoor Unit SiBE061121 Step Procedure Points Remove the cover Cover ASSY ASSY. (R15122) Release the harnesses for the electronic expansion valve coil from the hook (upper). (R15123) Release the harnesses for the electronic expansion valve coil from the hook (lower). (R15143) Remove the screw.
Page 175 SiBE061121 Indoor Unit Step Procedure Points Unfasten the 2 hooks Cover and remove the cover. Hook (R15146) Release the harnesses for the electronic expansion valve coil from the hooks. (R15144) Remove the 3 screws. (R15145) Unfasten the hook. Hook (R15147) Removal Procedure...
Page 176 Indoor Unit SiBE061121 Step Procedure Points Remove the motor cover. Motor cover (R15148) Release the harnesses for the fan motor from the hook. (R15149) Release the harnesses for the fan motor from the hooks. (R15144) Removal Procedure...
Page 177 SiBE061121 Indoor Unit Step Procedure Points Loosen the lock screw. You can remove the fan motor by loosening the screw. You do not need to remove the screw. (R15317) Remove the fan rotor and the fan motor. Fan rotor Fan motor (R15150) Remove the fan motor.
Page 178: Outdoor Unit - Rxg25/35K2V1B
Outdoor Unit - RXG25/35K2V1B SiBE061121 2. Outdoor Unit - RXG25/35K2V1B 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 179 SiBE061121 Outdoor Unit - RXG25/35K2V1B 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) The discharge grille has 4 hooks.
Page 180 Outdoor Unit - RXG25/35K2V1B SiBE061121 Step Procedure Points Remove the 8 screws of the front panel. (R11825) Front panel Unfasten the hooks. The front panel has 4 hooks. Pull and remove the front panel. Hook (R13505) Removal Procedure...
Page 181 SiBE061121 Outdoor Unit - RXG25/35K2V1B Step Procedure Points 3. Remove the fan motor. Nut size: M6 Remove the nut of the outdoor fan. 10 mm (R12236) Outdoor fan (R14205) Remove the outdoor When reassembling, align fan. mark of the outdoor fan with D-cut section of the motor shaft.
Page 182 Outdoor Unit - RXG25/35K2V1B SiBE061121 Step Procedure Points Cut the clamp. (R11830) Disconnect the connector for the fan motor [S70]. (R11831) [S70] Release the fan motor Fan motor lead wire from the hook. lead wire (R11832) Removal Procedure...
Page 183 SiBE061121 Outdoor Unit - RXG25/35K2V1B Step Procedure Points Remove the screw and remove the fan motor fixing frame. Fan motor fixing frame (R11833) (R12314) When reassembling, fit the lower hooks into the bottom frame. (R7206) Removal Procedure...
Page 184 Outdoor Unit - RXG25/35K2V1B SiBE061121 Step Procedure Points Open the hooks and When reassembling, put the 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 185 SiBE061121 Outdoor Unit - RXG25/35K2V1B Step Procedure Points Remove the 4 screws Right side panel on the right side panel. (R12163) Remove the screw near the stop valves. (R11839) Unfasten the hook on When reassembling, make the rear side. sure to fit the hook. (R11842) Removal Procedure...
Page 186 Outdoor Unit - RXG25/35K2V1B SiBE061121 Step Procedure Points Lift up the right side When reassembling, make panel and remove it. sure to fit the hook. Hook (R12272) Lift up the guard net Guard net and remove it. (R11841) Removal Procedure...
Page 187: Removal Of Electrical Box
SiBE061121 Outdoor Unit - RXG25/35K2V1B 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 Preparation connector for the Remove the panels and overload protector disconnect the connector for [S40].
Page 188 Outdoor Unit - RXG25/35K2V1B SiBE061121 Step Procedure Points Disconnect the relay connector for the compressor. (R11845) Disconnect the connector for the outdoor electronic expansion valve coil [S20]. [S20] (R11847) Cut the clamp. (R11850) Pull out the outdoor Be careful not to lose the clip heat exchanger for the thermistor.
Page 189 SiBE061121 Outdoor Unit - RXG25/35K2V1B Step Procedure Points Release the discharge Be careful not to lose the clip pipe thermistor. for the thermistor. Clip (R12279) Discharge pipe thermistor (R11849) Lift and remove the Electrical Box electrical box. (R11852) Removal Procedure...
Page 190: Removal Of Pcbs
Outdoor Unit - RXG25/35K2V1B SiBE061121 Removal of PCBs 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 main PCB You can remove the main and the forced cooling PCB when you disconnect operation switch PCB.
Page 191 SiBE061121 Outdoor Unit - RXG25/35K2V1B Step Procedure Points Pull out the forced Be careful of a sharp cooling operation protrusion at the back of the switch PCB. forced cooling operation Disconnect the switch PCB. connector [S110] to remove the forced cooling operation switch PCB.
Page 192 Outdoor Unit - RXG25/35K2V1B SiBE061121 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 193 SiBE061121 Outdoor Unit - RXG25/35K2V1B 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 194 Outdoor Unit - RXG25/35K2V1B SiBE061121 Step Procedure Points Remove the 6 screws. (R11866) Unfasten the 4 hooks and remove the main PCB. (R11867) Refer to page 11 for detail. [S50] [S100] [S10] [HL3] [HN3]: filter PCB [S20]: outdoor electronic expansion valve coil [HN3] [S40]: overload protector [HL3]...
Page 195 SiBE061121 Outdoor Unit - RXG25/35K2V1B 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 196 Outdoor Unit - RXG25/35K2V1B SiBE061121 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 197 SiBE061121 Outdoor Unit - RXG25/35K2V1B Step Procedure Points Feature of the filter Refer to page 11 for detail. (R11878) Removal Procedure...
Page 198: Removal Of Reactor / Partition Plate
Outdoor Unit - RXG25/35K2V1B SiBE061121 Removal of Reactor / Partition Plate 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 reactor. Preparation Reactor Remove the outer panels Remove the screw and according to the “Removal of...
Page 199 SiBE061121 Outdoor Unit - RXG25/35K2V1B Step Procedure Points The partition plate has When reassembling, fit the 2 hooks on the lower lower hooks into the bottom side. Lift and pull the frame. partition plate to remove. Hook (R13508) Removal Procedure...
Page 200: Removal Of Sound Blankets
Outdoor Unit - RXG25/35K2V1B SiBE061121 Removal of Sound Blankets 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 Since the piping ports are blanket (top).
Page 201 SiBE061121 Outdoor Unit - RXG25/35K2V1B 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 202: Removal Of Four Way Valve
Outdoor Unit - RXG25/35K2V1B SiBE061121 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 outdoor electronic expansion valve coil. Outdoor electronic expansion...
Page 203 SiBE061121 Outdoor Unit - RXG25/35K2V1B 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 204 Outdoor Unit - RXG25/35K2V1B SiBE061121 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. The pipes may get deformed.
Page 205: Removal Of Compressor
SiBE061121 Outdoor Unit - RXG25/35K2V1B 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 pipes and other parts that are heated by the gas brazing machine.
Page 206 Outdoor Unit - RXG25/35K2V1B SiBE061121 Step Procedure Points Heat up the brazed part Note: of the suction side and Do not use a metal saw for disconnect. 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 207: Outdoor Unit - Rxg50K2V1B
SiBE061121 Outdoor Unit - RXG50K2V1B 3. Outdoor Unit - RXG50K2V1B 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 208 Outdoor Unit - RXG50K2V1B SiBE061121 Step Procedure Points The discharge grille has 4 hooks. Remove the 6 screws of the front panel. Front panel (R12284) Push the front panel and lift the shield plate Shield plate to unfasten the hooks. (1) Push the front panel.
Page 209 SiBE061121 Outdoor Unit - RXG50K2V1B Step Procedure Points Unfasten the left side Lift the front panel while hooks, and then the pushing the left side panel right side hook. inward. Remove the front panel. Lift the front panel and unfasten the right side hook. When reassembling, fit the right side of the front panel first.
Page 210 Outdoor Unit - RXG50K2V1B SiBE061121 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 The stop valve cover has 6 hooks.
Page 211: Removal Of Outdoor Fan / Fan Motor
SiBE061121 Outdoor Unit - RXG50K2V1B 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 cover.
Page 212 Outdoor Unit - RXG50K2V1B SiBE061121 Step Procedure Points (R5258) 2. Remove the fan motor. Disconnect the connector for the fan [S70] motor [S70]. (R5259) Release the fan motor lead wire from the 7 hooks. Fan motor lead wire (R5260) Removal Procedure...
Page 213 SiBE061121 Outdoor Unit - RXG50K2V1B Step Procedure Points Remove the nut of the Nut size: M6 outdoor fan. 10 mm (R12236) Outdoor fan (R5262) When reassembling, align mark of the outdoor fan with D-cut section of the motor shaft. (R5263) Remove the lower 2 Be sure to remove the lower screws from the fan...
Page 214 Outdoor Unit - RXG50K2V1B SiBE061121 Step Procedure Points Release the fan motor When reassembling, put the 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 215: Removal Of Electrical Box
SiBE061121 Outdoor Unit - RXG50K2V1B 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 of the shield plate. Remove the top panel and the front panel according to the “Removal of Outer...
Page 216 Outdoor Unit - RXG50K2V1B SiBE061121 Step Procedure Points Disconnect the 2 earth wires. Earth wires (R5269) Remove the 3 screws of the right side panel. Right side panel (R5270) Remove the screw of the electrical box. Removal Procedure...
Page 217 SiBE061121 Outdoor Unit - RXG50K2V1B Step Procedure Points Unfasten the hooks and When reassembling, insert remove the right side the 2 hooks of the lower part panel. and the hook of the upper Hook back. (R5272) Hook (R5273) Disconnect the [S20]: outdoor electronic connectors of the front expansion valve coil...
Page 218 Outdoor Unit - RXG50K2V1B SiBE061121 Step Procedure Points Release the clamp of the compressor relay harness with pliers. Compressor relay harness (R5277) Detach the clamp and release the thermistor Clamp Hook lead wires from the hook. Thermistor lead wire (R5278) Remove the screw.
Page 219 SiBE061121 Outdoor Unit - RXG50K2V1B Step Procedure Points Release the harness of the outdoor temperature thermistor from the hook. (R9403) Lift and remove the electrical box. Electrical box (R5279) Removal Procedure...
Page 220: Removal Of Pcbs
Outdoor Unit - RXG50K2V1B SiBE061121 Removal of PCBs 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 Preparation [S102] connectors [S52] [S52] Remove the electrical box [S102] from the service according to the “Removal of monitor PCB.
Page 221 SiBE061121 Outdoor Unit - RXG50K2V1B 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 reactor [HR1] [HR2].
Page 222 Outdoor Unit - RXG50K2V1B SiBE061121 Step Procedure Points Remove the 3 screws of the main PCB. Main PCB (R5287) Unfasten the 4 hooks. Hook (R5288) Lift up and remove the Refer to page 13 for detail. main PCB. Main PCB (R5289) Removal Procedure...
Page 223: Removal Of Sound Blankets / Thermistors
SiBE061121 Outdoor Unit - RXG50K2V1B Removal of Sound Blankets / 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) Remove the sound Since the piping ports are...
Page 224 Outdoor Unit - RXG50K2V1B SiBE061121 Step Procedure Points Remove the sound Sound blanket blanket (top lower). (top lower) (R11398) Remove the sound blanket (inner). Sound blanket (inner) (R5296) Release the discharge Be careful not to lose the clip pipe thermistor. for the thermistor.
Page 225: Removal Of Four Way Valve
SiBE061121 Outdoor Unit - RXG50K2V1B 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 Remove the screw and remove the four way Warning valve coil.
Page 226: Removal Of Outdoor Electronic Expansion Valve
Outdoor Unit - RXG50K2V1B SiBE061121 Removal of Outdoor 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 outdoor electronic expansion Outdoor electronic expansion valve coil valve coil.
Page 227: Removal Of Compressor
SiBE061121 Outdoor Unit - RXG50K2V1B 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 228 Outdoor Unit - RXG50K2V1B SiBE061121 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 careful not to get yourself Be sure to apply nitrogen burnt with the pipes and other replacement when...
Page 229 SiBE061121 Outdoor Unit - RXG50K2V1B 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 230: Part 8 Trial Operation And Field Settings
SiBE061121 Part 8 Trial Operation and Field Settings 1. Pump Down Operation................220 2. Forced Cooling Operation ..............221 3. Trial Operation ..................223 4. Field Settings ..................224 4.1 When 2 Units are Installed in 1 Room..........224 4.2 Standby Electricity Saving..............225 4.3 Jumper and Switch Settings..............225 5.
Page 231: Pump Down Operation
SiBE061121 Pump Down Operation 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing the unit. Detail 1) Remove the valve caps from the liquid stop valve and the gas stop valve. 2) Carry out forced cooling operation.
Page 232: Forced Cooling Operation
Forced Cooling Operation SiBE061121 2. Forced Cooling Operation Item Forced Cooling Conditions The forced cooling operation is allowed when both the following conditions are met. 1) The outdoor unit is not abnormal and not in the 3-minute standby mode. 2) The outdoor unit is not operating. Start The forced cooling operation starts when any of the following conditions is fulfilled.
Page 233 SiBE061121 Forced Cooling Operation Outdoor Unit (50 class) S102 LED-A Forced cooling operation ON/OFF switch (R14176) Trial Operation and Field Settings...
Page 234: Trial Operation
Trial Operation SiBE061121 3. Trial Operation Outline 1. Measure the power supply voltage and make sure that it falls in the specified range. 2. Trial operation should be carried out in either cooling or heating operation. 3. Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as flap movement, are working properly.
Page 235: Field Settings
SiBE061121 Field Settings 4. Field Settings When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 pairs of indoor unit and wireless remote controller can be set for different address. Both the indoor unit PCB and the wireless remote controller need alteration.
Page 236: Standby Electricity Saving
Field Settings SiBE061121 Standby Electricity Saving Outline 25/35 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 Following procedure is required for turning ON the function. 1.
Page 237: Application Of Silicon Grease To A Power Transistor And A Diode Bridge
SiBE061121 Application of Silicon Grease to a Power Transistor and a Diode Bridge 5. 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 238: Part 9 Appendix
SiBE061121 Part 9 Appendix 1. Piping Diagrams..................228 1.1 Indoor Unit....................228 1.2 Outdoor Unit ..................229 2. Wiring Diagrams..................230 2.1 Indoor Unit....................230 2.2 Outdoor Unit ..................231 Appendix...
Page 239: Piping Diagrams
SiBE061121 Piping Diagrams 1. Piping Diagrams Indoor Unit FVXG25/35K2V1B FVXG50K2V1B INDOOR UNIT INDOOR UNIT RADIANT PANEL THERMISTOR 6.4CuT THERMISTOR RADIANT PANEL THERMISTOR 6.4CuT THERMISTOR HEAT EXCHANGER HEAT EXCHANGER THERMISTOR ON HEAT EXCH. CROSS FLOW FAN THERMISTOR FIELD PIPING ON HEAT EXCH. 6.4CuT CROSS FLOW FAN FAN MOTOR...
Page 240: Outdoor Unit
Piping Diagrams SiBE061121 Outdoor Unit RXG25/35K2V1B OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER THERMISTOR 7.0CuT 7.0CuT HEAT EXCHANGER THERMISTOR MOTOR OPERATED VALVE 4.8CuT 6.4CuT 6.4CuT 4.8CuT MUFFLER MUFFLER WITH WITH FILTER FILTER PROPELLER FAN 9.5CuT MUFFLER WITH FILTER FOUR WAY VALVE FIELD PIPING ON:HEATING (6.4CuT)
Page 241: Wiring Diagrams
SiBE061121 Wiring Diagrams 2. Wiring Diagrams Indoor Unit FVXG25/35/50K2V1B PCB1 PCB3 → RECTIFIER S2W(4) 3.15A outdoor MR10 GRN/YLW PCB2 C102 FIELD WIRING. SIGNAL RECEIVER TRANSMISSION CAUTION CIRCUIT NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS C101 TURNED OFF AND THEN BACK 1 RED ON AGAIN.
Page 242: Outdoor Unit
Wiring Diagrams SiBE061121 Outdoor Unit RXG25/35K2V1B FIELD WIRING. indoor MRM20 IPM1 MRM10 C119 MR30 3.15A PCB2 3.15A W V U IPM2 MR30_A MR30_B MRCW S100 PCB1 X11A outdoor NOTE 1.REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. t˚ t˚ t˚ C5, C6, C119 : CAPACITOR X12A...
Page 243 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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