SiUS12-928_A G-Series / J-Series [Applied Models] Inverter Multi : Heat Pump
SiUS12-928_A SUPER MULTI NX G-Series / J-Series Heat Pump Indoor Unit CTXS07JVJU CTXS09HVJU CTXS12HVJU FTXS15HVJU FTXS18HVJU FDXS09DVJU FDXS12DVJU Outdoor Unit 2MXS18GVJU 3MXS24JVJU 4MXS32GVJU 1. Safety Considerations.............................................................................. vii 1.1 Safety Considerations for Repair ................................................................vii 1.2 Safety Considerations for Users.................................................................
SiUS12-928_A Part 3 Printed Circuit Board Connector Wiring Diagram .................................................. 15 1. Printed Circuit Board Connector Wiring Diagram......................................17 1.1 1.2 1.3 1.4 Indoor Unit - Duct-Free System.................................................................. 17 Indoor Unit - Slim Duct Built-in System ...................................................... 19 Outdoor Unit - 2MXS18GVJU ...........................................................
SiUS12-928_A Part 5 Operation Manual ................................................................ 61 1. System Configuration................................................................................63 2. Duct-Free System .....................................................................................64 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Remote Controller ...................................................................................... 64 AUTO · DRY · COOL · HEAT · FAN Operation ......
SiUS12-928_A 5.14 5.15 5.16 5.17 5.18 5.19 5.20 5.21 5.22 5.23 5.24 5.25 5.26 5.27 Input Overcurrent Detection ..................................................................... 119 Four-Way Valve Abnormality (18 Class) .................................................. 121 Discharge Pipe Temperature Control....................................................... 123 High Pressure Control in Cooling .............................................................
SiUS12-928_A Part 8 Trial Operation and Field Settings .................................................................... 215 1. Trial Operation ........................................................................................217 2. Wiring Error Check Function ...................................................................219 3. Field Settings ..........................................................................................221 3.1 3.2 3.3 3.4 Priority Room Setting ...................
SiUS12-928_A Table of Contents vi
Safety Considerations SiUS12-928 1. Safety Considerations Read these SAFETY CONSIDERATIONS carefully before performing any repair work. Comply with these safety symbols without fail.Meanings of DANGER, WARNING, CAUTION, and NOTE Symbols: DANGER .............. Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING ............ Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION ......
SiUS12-928 • Do not clean the air conditioner by splashing water on it. Washing the unit with water may cause an electrical shock. • Ground the unit when repairing equipment in a humid or wet place to avoid electrical shocks. • Turn off the power when cleaning the equipment to prevent internal fans that rotate at high speed from starting suddenly as they can cause injury. • Let the refrigerant lines cool down before performing any repair work.
SiUS12-928_A Part 1 List of Functions 1. Functions.....................................................................................................
SiUS12-928_A List of Functions 2
Functions SiUS12-928 Functions Basic Function Inverter (with Inverter Power Control) Comfortable Airflow Comfort Control Operation Lifestyle Convenience Health & Clean Functions Air-Purifying Filter — — Photocatalytic Deodorizing Filter — — Air-Purifying Filter with Photocatalytic Deodorizing Function Operation Limit for Cooling (°FDB) — Operation Limit for Heating (°FWB) PAM Control Compressor Category CTXS09/12HVJU Category CTXS09/12HVJU 1.
Category Functions Basic Function Inverter (with Inverter Power Control) Compressor Comfortable Airflow Comfort Control Operation Lifestyle Convenience Category Air-Purifying Filter — Photocatalytic Deodorizing Filter — Air-Purifying Filter with Photocatalytic Deodorizing Function — Titanium Apatite Photocatalytic Air-Purifying Filter — Swing Compressor — Air Filter (Prefilter) Rotary Compressor — Wipe-clean Flat Panel Reluctance DC Motor — Washable Grille — Power-Airf
Category Functions Basic Function Inverter (with Inverter Power Control) Comfortable Airflow Comfort Control Operation Lifestyle Convenience Health & Air Cleaning Functions Air-Purifying Filter — — Photocatalytic Deodorizing Filter — — Air-Purifying Filter with Photocatalytic Deodorizing Function — — Operation Limit for Cooling (°FDB) — Operation Limit for Heating (°FWB) PAM Control Compressor Category FDXS09/12DVJU SiUS12-928 FDXS09/12DVJU Functions Oval Scroll Compressor — Sw
Basic Function Inverter (with Inverter Power Control) Compressor Comfortable Airflow Comfort Control Operation Lifestyle Convenience Operation Limit for Cooling (°FDB) 14~ 14~ 114.8 114.8 Operation Limit for Heating (°FWB) 5~ 59.9 5~ 59.
SiUS12-928_A Part 2 Specifications 1. Specifications ..............................................................................................9 1.1 Indoor Unit.................................................................................................... 9 1.2 Outdoor Unit ...............................................................................................
SiUS12-928_A Specifications 8
Specifications SiUS12-928_A 1. Specifications 1.
SiUS12-928_A Specifications 60 Hz, 230 V FTXS15HVJU Model Cooling Rated Capacity Front Panel Color FTXS18HVJU Heating Cooling 15 kBtu/h Class White Airflow Rates cfm (m3/min) Fan Type Motor Output Speed Air Direction Control Air Filter Running Current (Rated) Power Consumption (Rated) Power Factor Temperature Control Dimensions (H x W x D) Packaged Dimensions (H x W x D) Weight Gross Weight Operation Sound H/M/L Heat Insulation Liquid Piping Connection Gas Drain H M L W Steps A W % in.
Specifications 1.2 SiUS12-928_A Outdoor Unit 60 Hz, 208 - 230 V 2MXS18GVJU Model Cooling Capacity Power Consumption Running Current Casing Color Compressor Refrigerant Oil Refrigerant Type Model Motor Output Model Charge Type Charge oz (g) Lbs (kg) H M L H M L Airflow Rate cfm Type Motor Output Running Current Power Consumption Starting Current Dimension (H × W × D) Packaged Dimension (H × W × D) Weight Gross Weight Operation Sound Liquid Piping Connection Gas Drain Heat Insulation No.
SiUS12-928_A Specifications 60 Hz, 208 - 230 V 3MXS24JVJU Model Cooling Capacity Power Consumption Running Current Casing Color Compressor Refrigerant Oil Refrigerant Type Model Motor Output Model Charge Type Charge oz Lbs (kg) H M L H M L Airflow Rate cfm Type Motor Output Running Current Power Consumption Starting Current Dimension (H × W × D) Packaged Dimension (H × W × D) Weight Gross Weight Operation Sound Liquid Piping Connection Gas Drain Heat Insulation No. of Wiring Connection Max.
Specifications SiUS12-928_A 60 Hz, 208 - 230 V 4MXS32GVJU Model Cooling Capacity Power Consumption Running Current Casing Color Compressor Refrigerant Oil Refrigerant Type Model Motor Output Model Charge Type Charge oz (g) Lbs (kg) H M L H M L Airflow Rate cfm Type Motor Output Running Current Power Consumption Starting Current Dimension (H × W × D) Packaged Dimension (H × W × D) Weight Gross Weight Operation Sound Liquid Piping Connection Gas Drain Heat Insulation No. of Wiring Connection Max.
SiUS12-928_A Specifications Specifications 14
SiUS12-928_A Part 3 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram......................................13 1.1 1.2 1.3 1.4 15 Indoor Unit - Duct-Free System.................................................................. 13 Indoor Unit - Slim Duct Built-in System ...................................................... 15 Outdoor Unit - 2MXS18GVJU ....................................................................
SiUS12-928_A Printed Circuit Board Connector Wiring Diagram 16
Printed Circuit Board Connector Wiring Diagram SiUS12-928_A 1. Printed Circuit Board Connector Wiring Diagram 1.
SiUS12-928_A PCB Detail Printed Circuit Board Connector Wiring Diagram PCB (1): Control PCB H2 H3 FG S1 S32 V1 FU1 H1 S21 S6 S8 S35 LED A JA JB JC S28 PCB (2): Signal Receiver PCB S26 2P099167-1 PCB (3): Buzzer PCB S27 SW1 S38 S29 2P099167-1 RTH1 PCB (4): Display PCB 2P099167-1 PCB (5): INTELLIGENT EYE Sensor PCB LED1 LED2 LED3 S37 2P099167-1 S36 3P099913-1 Printed Circuit Board Connector Wiring Diagram 18
Printed Circuit Board Connector Wiring Diagram 1.
SiUS12-928_A PCB Detail Printed Circuit Board Connector Wiring Diagram PCB (1): Control PCB FU1 S1 H2 H1 H3 V1 GND S7 S21 S26 LED A JA JB JC S32 2P131149-1 PCB (2): Display PCB Printed Circuit Board Connector Wiring Diagram 20
Printed Circuit Board Connector Wiring Diagram 1.3 SiUS12-928_A Outdoor Unit - 2MXS18GVJU Connectors and Other Parts Main PCB 1) S10 2) S15 3) S20 (white) 4) S21 (red) 5) S31, S32 6) S33, S71 7) S40 8) S51, S101 9) S80 10)S90 11)S91 12)S92 13)S93 14)AC1, AC2 15)E 16)H1, H2 17)FU2 18)V2, V5 Connector for MID1 (indoor - outdoor transmission) Connector for COOL / HEAT mode lock ∗ Refer to page 221 for detail.
SiUS12-928_A Printed Circuit Board Connector Wiring Diagram MID2 (Inverter PCB) 1) 2) 3) 4) S34, S72 S70 FU201 W, V, U, N Connector for main PCB Connector for outdoor fan motor Fuse (3.
Printed Circuit Board Connector Wiring Diagram SiUS12-928_A MID1 HN V3 FU1 HL S11 HE 3P080081-2 MID2 (Inverter PCB) S72 W V U N S34 S70 FU201 (3.
SiUS12-928_A 1.4 Printed Circuit Board Connector Wiring Diagram Outdoor Unit - 3MXS24JVJU, 4MXS32GVJU Connectors and Other Parts PCB (1): Main PCB 1) S10 2) S15 Connector for terminal board (indoor - outdoor transmission) Connector for COOL / HEAT mode lock ∗ Refer to page 221 for detail.
Printed Circuit Board Connector Wiring Diagram PCB Detail SiUS12-928_A PCB (1): Main PCB AC1 (brown) FU2 E1 E2 V3 FU1 V100 V2 HR1 (white) V9 HR2 (blue) AC2 (blue) S10 S15 S101 V5 S80 S93 S23 S22 S21 S20 S70 FU3 S40 S92 S90 S51 W V U 2P209947-1 2P209947-2 PCB (2): Service Monitor PCB SW2 LED3 LED1 LED4 LED2 LED A S52 SW5 SW1 SW3 SW4 S102 3P165332-1 25 Printed Circuit Board Connector Wiring Diagram
SiUS12-928_A Printed Circuit Board Connector Wiring Diagram Printed Circuit Board Connector Wiring Diagram 26
SiUS12-928_A Part 4 Function and Control 1. Main Functions..........................................................................................29 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 Temperature Control .................................................................................. 29 Frequency Principle.................................................................................... 29 Airflow Direction Control (Duct-Free System) ............................................
SiUS12-928_A Function and Control 28
Main Functions SiUS12-928_A 1. Main Functions 1.1 Temperature Control Definitions of Temperatures The definitions of temperatures are classified as following.
SiUS12-928_A Drawing of Inverter Main Functions The following drawing shows a schematic view of the inverter principle: Refrigerant circulation rate (high) DC power Amount of heat exchanged air (small) high speed AC power Amount of heat exchanged air (large) Amount of heat exchanged air (large) high f low f Amount of heat exchanged air (small) low speed 50 Hz freq= constant 60 Hz freq=variable capacity= variable Refrigerant circulation rate (low) (R2812) Inverter Features The inverter provi
Main Functions 1.3 SiUS12-928_A Airflow Direction Control (Duct-Free System) Power-Airflow Dual Louvers The large louvers send a large volume of air downward to the floor, providing optimum control in cooling, dry, and heating mode. Cooling / Dry Mode During cooling or dry mode, the louver retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room. Heating Mode During heating mode, the large louver directs airflow downward to spread the warm air to the entire room.
SiUS12-928_A 1.4 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. This is done through phase control and Hall IC control. For more information about Hall IC, refer to the troubleshooting for fan motor on page 106, 107.
Main Functions 1.5 SiUS12-928_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.
SiUS12-928_A 1.6 Main Functions Automatic Operation Outline Details Automatic Cooling / Heating Function When the AUTO 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, and automatically operates in that mode. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
Main Functions 1.7 SiUS12-928_A 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 zone A. Thermostat ON Condition The temperature difference returns to zone C after being in zone A. The system resumes from defrost control in any zone except A. The operation turns on in any zone except A.
SiUS12-928_A 1.8 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.
Main Functions 1.9 SiUS12-928_A HOME LEAVE Operation Outline HOME LEAVE operation is a function that allows you to record your favorite set temperature and airflow rate. You can start your favorite operation mode simply by pressing the [HOME LEAVE] button on the remote controller. Detail 1. Start of Function The function starts when the [HOME LEAVE] button is pressed in cooling mode, heating mode (including POWERFUL operation), or while the operation is stopped.
SiUS12-928_A Main Functions 1.10 INTELLIGENT EYE Operation Outline This is the function that detects existence of humans in the room by a human motion sensor (INTELLIGENT EYE) and reduces the capacity when there is nobody in the room in order to save electricity. Detail 1. Detection method by INTELLIGENT EYE sampling (20msec) Sensor output 1sec If the sensor detects the outputs 10 times/sec. or more, it determines movement in the room.
Main Functions SiUS12-928_A 1.11 Inverter POWERFUL Operation Outline In order to maximize the benefits of the cooling and heating capacity, 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. Operation mode Fan speed Target temperature COOL DRY H tap + 90 rpm Dry rotating speed + 50 rpm 18°C (64°F) Lowered by 2°C (3.
SiUS12-928_A Main Functions 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 the airflow is either stopped or reduced, thereby carrying out comfortable heating of the room. *The cold air blast is also prevented using a similar control when the defrosting operation is started or when the thermostat is turned ON. 1.12.
Main Functions SiUS12-928_A 1.12.4 Air-Purifying Filter with Photocatalytic Deodorizing Function Duct-Free System Only This filter incorporates the benefits of a Air-Purifying Filter and Photocatalytic Deodorizing Filter in a single unit. Combining the two filters in this way increases the active surface area of the new filter. This larger surface area allows the filter to effectively trap microscopic particles, decompose odors and eliminate bacteria and viruses even in large living rooms.
SiUS12-928_A Function of Thermistor 2.
Function of Thermistor SiUS12-928_A A Outdoor Heat Exchanger Thermistor 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 outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so that the target discharge pipe temperature can be obtained. 2.
SiUS12-928_A Control Specification 3. Control Specification 3.1 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.
Control Specification 3.2 Outline SiUS12-928_A Frequency Control Frequency that corresponds to each room’s capacity is determined according to the difference between the target temperature and the thermistor temperature of each room. The function is explained as follows. 1. How to determine frequency 2. Frequency command from an indoor unit (Difference between a room thermistor temperature and the target temperature) 3. Frequency command from an indoor unit (The ranked capacity of the operating room) 4.
SiUS12-928_A Control Specification Indoor Frequency Command (ΔD signal) The difference between a room thermistor temperature and the target temperature is taken as the “ΔD signal” and is used for frequency command. Temperature ΔD difference signal –2.0°C (–3.6°F) ∗Th OFF Temperature difference 0°C (0°F) ΔD signal 4 Temperature difference 2.0°C (3.6°F) ΔD signal 8 Temperature difference 4.0°C (7.2°F) ΔD signal C –1.5°C (–2.7°F) –1.0°C (–1.8°F) 1 2 0.5°C (0.9°F) 1.0°C (1.8°F) 5 6 2.5°C (4.5°F) 3.
Control Specification 3.3 SiUS12-928_A 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 and outdoor temperatures, and the discharge pipe temperature. Details ON Condition When the outdoor temperature and the discharge pipe temperature are below 10.5°C (51°F), the inverter operation in open phase starts.
SiUS12-928_A Control Specification 3.3.4 3-Minute Standby Turning on the compressor is prohibited for 3 minutes after turning off. (Except when defrosting.) 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not used when defrosting.) (Hz) Frequency FCG3 FCG2 FCG1 TCG1 TCG2 (Sec.
Control Specification 3.4 Outline SiUS12-928_A Discharge Pipe Temperature Control The discharge pipe temperature is used as the internal temperature of the compressor. If the discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep this temperature from going up further. Detail 120°C(248°F) 111°C(232°F) 109°C(228°F) 107°C(225°F) Dropping zone Keep zone Reset zone Zone Stop zone Dropping zone 3.
SiUS12-928_A 3.6 Control Specification Freeze-up Protection Control Outline During cooling operation, the signals sent from the indoor unit allow the operating frequency limitation and prevent freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) Details The operating frequency limitation is judged with the indoor heat exchanger temperature 2 seconds after operation starts and 30 seconds after the number of operation room is changed.
Control Specification 3.8 SiUS12-928_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. 3. Fan OFF control while defrosting The outdoor fan is turned OFF while defrosting. 4. Fan ON/OFF control when operation starts / stops The outdoor fan is turned ON when the operation starts.
SiUS12-928_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 are determined with the outdoor temperature and the outdoor heat exchanger temperature. The system is in heating operation. The compressor operates for 6 minutes.
Control Specification SiUS12-928_A 3.11 Low Hz High Pressure Limit Outline The upper limit of high pressure in a low Hz zone is set. The upper limit of the indoor heat exchanger temperature is also set by the operating frequency. There are 3 zones. Reset zone, keep zone, and dropping zone, and the frequency control is carried out according to each zone.
SiUS12-928_A Control Specification Detail Gas pipe isothermal control SC (supercooling) control Control when frequency changed Control for abnormally high discharge pipe temperature Oil recovery control Indoor freeze-up protection control Liquid pipe temperature control Liquid pipe temperature control for stopped rooms Dew prevention control for indoor roto The following are examples of control which function in each mode by the electronic expansion valve control.
Control Specification SiUS12-928_A 3.12.1 Fully Closing with Power on The electronic expansion valve is initialized when the power is turned on. The opening position is set and the pressure equalization is developed. 3.12.2 Pressure Equalization Control When the compressor is stopped, pressure equalization control is activated. The electronic expansion valve opens, and develops pressure equalization. 3.12.
SiUS12-928_A Control Specification 3.12.8 Target Discharge Pipe Temperature Control The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger temperature, and the electronic expansion valve opening is adjusted so that the actual discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect SH (superheat) control using the discharge pipe temperature). SC (Subcool) Set the target discharge pipe temperature to control SH.
Control Specification Detail SiUS12-928_A Detect Disconnection When the starting control (630 seconds) finishes, and the 9-minute timer for the compressor operation continuation is not counting time, the following adjustment is made. 1. When the operation mode is cooling When the discharge pipe temperature is lower than the outdoor heat exchanger temperature, the discharge pipe thermistor disconnection is ascertained. 2.
SiUS12-928_A Control Specification 3.13.3 Refrigerant Shortage Control Outline I Detecting by power consumption If the power consumption is below the specified value and the frequency is higher than the specified frequency, it is regarded as refrigerant shortage. The power consumption is small comparing with that in the normal operation when refrigerant is insufficient, and refrigerant shortage is detected by checking a power consumption.
Control Specification SiUS12-928_A 3.14 Forced Operation Mode Outline Forced operation mode includes forced cooling and forced heating. Operation mode can be selected by the operation mode switch (SW2) on the outdoor unit. Press the forced operation ON/OFF switch (SW1) on the outdoor unit to start the operation.
SiUS12-928_A Function and Control Control Specification 60
SiUS12-928_A Part 5 Operation Manual 1. System Configuration................................................................................63 2. Duct-Free System .....................................................................................64 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Remote Controller ...................................................................................... 64 AUTO · DRY · COOL · HEAT · FAN Operation .........................................
SiUS12-928_A Operation Manual 62
System Configuration SiUS12-928_A 1. System Configuration After installation and test operation of the room air conditioner are completed, the air conditioner should be handled and operated as described 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 most efficiently. Providing instructions to the user can reduce requests for servicing by 80%.
SiUS12-928_A Duct-Free System 2. Duct-Free System 2.
Duct-Free System SiUS12-928_A Selects the operation mode. INTELLIGENT EYE operation Cancels the timer setting.
SiUS12-928_A 2.2 Duct-Free System 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. • Each pressing of the button advances the mode setting in sequence. : AUTO : DRY : COOL : HEAT : FAN 4 2, 3 1 5 2. Press “ON/OFF button”. • The OPERATION lamp lights up.
Duct-Free System SiUS12-928_A To change the air flow rate setting 5. Press “FAN setting button”. DRY mode The air flow rate setting is not variable. AUTO or COOL or HEAT or FAN mode Five levels of air flow rate setting from “ ” to “ “ ” “ ” are available. ” plus • Indoor unit quiet operation When the air flow is set to “ ”, the sound from the unit is lowered. Use this setting to operate the indoor unit more quietly. The unit might lose capacity when the fan strength is set to a lower level.
SiUS12-928_A 2.3 Duct-Free System Adjusting the Airflow Direction To adjust the louvers (horizontal blades) is displayed on the LCD and the louvers begin to swing. When the louvers have reached the desired position, The louvers will stop moving. is no longer displayed on the LCD. To adjust the fins (vertical blades) When the fins have reached the desired The fins will stop moving. is no longer displayed on the LCD.
Duct-Free System SiUS12-928_A Using 3-D airflow circulates cool or warm air to prevent the accumulation of too much cool air on the floor of a room or too much warm air rising to the room’s ceiling, assuring a more even distribution of air.
SiUS12-928_A 2.4 Duct-Free System INTELLIGENT EYE Operation is displayed on the LCD. is no longer displayed on the LCD. detecting movement. The set temperature is shifted in detects movement again.
Duct-Free System SiUS12-928_A and light reflected off the mirrors on passing vehicles. operation COMFORT AIRFLOW Do not place large objects near the sensor. Also, keep heating units or humidifiers outside the sensor’s detection area. This sensor can detect undesirable objects. Do not hit or forcibly push the INTELLIGENT EYE sensor. This can lead to damage and malfunction.
SiUS12-928_A 2.5 Duct-Free System POWERFUL Operation is no longer displayed on the LCD. is no longer displayed on the LCD.
Duct-Free System 2.6 SiUS12-928_A OUTDOOR UNIT Quiet Operation is no longer displayed on the LCD.
SiUS12-928_A 2.7 Duct-Free System HOME LEAVE Operation is no longer displayed on the LCD.
Duct-Free System 75 SiUS12-928_A Operation Manual
SiUS12-928_A 2.
Duct-Free System 77 SiUS12-928_A Operation Manual
SiUS12-928_A 2.
Duct-Free System 79 SiUS12-928_A Operation Manual
SiUS12-928_A Slim Duct Built-In System 3. Slim Duct Built-In System 3.1 Remote Controller Remote Controller 1 2 5 3 6 4 7 9 8 10 13 15 14 12 11 〈 ARC433B63 〉 1. Signal transmitter: • It sends signals to the indoor unit. 2. Display: • It displays the current settings. (In this illustration, each section is shown with all its displays ON for the purpose of explanation.) 3. HOME LEAVE button: HOME LEAVE operation (page 14.) 4. POWERFUL button: POWERFUL operation (page 12.) 5.
Slim Duct Built-In System 3.2 SiUS12-928_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. • Each pressing of the button advances the mode setting in sequence. : AUTO : DRY : COOL : HEAT : FAN 4 2, 3 1 5 2. Press “ON/OFF button”. • The OPERATION lamp lights up.
SiUS12-928_A Slim Duct Built-In System To change the air flow rate setting 5. Press “FAN setting button”. DRY mode The air flow rate setting is not variable. AUTO or COOL or HEAT or FAN mode Five levels of air flow rate setting from “ ” to “ “ ” “ ” are available. ” plus • Indoor unit quiet operation When the air flow is set to “ ”, the sound from the unit is lowered. Use this setting to operate the indoor unit more quietly. The unit might lose capacity when the fan strength is set to a lower level.
Slim Duct Built-In System 3.3 SiUS12-928_A POWERFUL Operation p 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 20 minutes. Then the system automatically operates again with the settings which were used before POWERFUL operation. • When using POWERFUL operation, there are some functions that are not available. • “ ” is displayed on the LCD.
SiUS12-928_A 3.4 Slim Duct Built-In System OUTDOOR UNIT QUIET Operation p OUTDOOR UNIT QUIET operation lowers the sound levels 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. Press “QUIET button”. • “ ” is displayed on the LCD. To cancel OUTDOOR UNIT QUIET operation 2. Press “QUIET button” again. • “ is no longerfrom displayed on the LCD. ” disappears the LCD.
Slim Duct Built-In System 3.5 SiUS12-928_A HOME LEAVE Operation HOME LEAVE operation is a function which allows you to record your preferred temperature and air flow rate settings. To start HOME LEAVE operation 1. Press “HOME LEAVE button”. • “ ” is displayed on the LCD. • The HOME LEAVE lamp lights up. 1, 2 To cancel HOME LEAVE operation 2. Press “HOME LEAVE button” again. • “ ” disappears the LCD. is no longerfrom displayed on the LCD. • The HOME LEAVE lamp goes off.
SiUS12-928_A Slim Duct Built-In System What’s the HOME LEAVE operation? Is there a set temperature and air flow rate that is most comfortable, a set temperature and air flow rate that you use the most? HOME LEAVE operation is a function that allows you to record your favorite set temperature and air flow rate. You can start your favorite operation mode simply by pressing the HOME LEAVE button on the remote controller. This function is convenient in the following situations. Useful in these cases 1.
Slim Duct Built-In System 3.6 SiUS12-928_A TIMER Operation 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 • Check that the clock is correct. If not, set the clock to the present time. 1. Press “OFF TIMER button”. is displayed. blinks. 2. Press “TIMER Setting button” until the time setting reaches the point you like.
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SiUS12-928_A Part 6 Service Diagnosis 1. Caution for Diagnosis................................................................................91 1.1 Troubleshooting with LED .......................................................................... 91 2. Problem Symptoms and Measures ...........................................................93 3. Service Check Function ............................................................................94 3.1 ARC452 Series Remote Controller ......................
SiUS12-928_A Service Diagnosis 90
Caution for Diagnosis SiUS12-928_A 1. Caution for Diagnosis 1.1 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. 2. When a signal transmission error occurs between the indoor and outdoor units. In either case, conduct the diagnostic procedure described in the following pages.
SiUS12-928_A Caution for Diagnosis Outdoor Unit Service monitor PCB 2MXS18GVJU LED A LED 1 LED 2 LED 3 LED 4 3MXS24JVJU 4MXS32GVJU (R6333) There are a green LED (LED A) and red LEDs (LED 1- LED 4) on the outdoor unit PCB. The LED A indicates microcomputer operation condition. In normal condition, the LED A is blinking and the LED 1- LED 4 are OFF. Even after the error is canceled and the unit operates in normal condition, the LED indication remains.
Problem Symptoms and Measures SiUS12-928_A 2. Problem Symptoms and Measures Symptom Check Item None of the units operates. Check the power supply. Check the type of the indoor units. Check the outdoor temperature. Diagnose with outdoor unit LED indication Check the remote controller addresses. Operation sometimes stops. Check the power supply. Check the outdoor temperature. Diagnose with outdoor unit LED indication. Some indoor units do not operate. Check the type of the indoor units.
SiUS12-928_A Service Check Function 3. Service Check Function 3.1 ARC452 Series Remote Controller Check Method 1 1. When the timer cancel button is held down for 5 seconds, “00” indication is displayed on the temperature display section. TIMER CANCEL button < ARC452A9 > (R9673) 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below. Note: Service Diagnosis No. 1 Code 00 No. 13 Code C7 No.
Service Check Function SiUS12-928_A Check Method 2 1. Press the 3 buttons (TEMP, TEMP, MODE) at the same time. (R8381) The left-side digit blinks. (R9430) 2. Press the TEMP or button and change the figure until you hear the sound of beep or beepbeep. (R8383) 3. Diagnose by the sound. beep: The left digit does not correspond with the error code. beep beep: The figure of the left digit corresponds with the error code but the one’s not.
SiUS12-928_A Service Check Function 5. Press the TEMP or button and change the figure until you hear the beep. (R8383) 6. Diagnose by the sound. beep : The left digit does not correspond with the error code. beep beep : The left digit corresponds with the error code but the right side digit does not. long beep : Both digits correspond with the error code. 7. Determine the error code. The figures indicated when you hear the beepare error codes. (Error codes and description → Refer to page 100.) 8.
Service Check Function 3.2 SiUS12-928_A ARC433 Series Remote Controller 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 < ARC433 Series > (R11506) 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below. Note: 97 No. Code No. Code No.
SiUS12-928_A Service Check Function Check Method 2 1. Press the center of the TEMP button and the MODE button at the same time. (R4272) The left-side digit blinks. (R4273) 2. Press the TEMP or button and change the figure until you hear the beep (R4274) 3. Diagnose by the sound. beep : The left-side digit does not correspond with the error code. beep beep : The left digit corresponds with the error code but the right-side digit does not.
Service Check Function SiUS12-928_A 5. Press the TEMP or button and change the figure until you hear the beep. (R4277) 6. Diagnose by the sound. beep : The left digit does not correspond with the error code. beep beep : The left digit corresponds with the error code but the right-side digit does not. “long beep” : Both digits correspond with the error code. 7. Determine the error code. The figures indicated when you hear the beepare error codes. (Error codes and description → Refer to page 100.
SiUS12-928_A Code Indication on the Remote Controller 4. Code Indication on the Remote Controller 4.
Troubleshooting SiUS12-928_A 5. Troubleshooting 5.
SiUS12-928_A 5.
Troubleshooting 5.3 SiUS12-928_A Indoor Unit PCB Abnormality A1 Remote Controller Display Method of Malfunction Detection Evaluation of zero-cross detection of power supply by the indoor unit PCB. Malfunction Decision Conditions There is no zero-cross detection in approximately 10 seconds.
SiUS12-928_A 5.4 Troubleshooting Freeze-up Protection Control or Heating Peak-cut Control Remote Controller Display A5 Method of Malfunction Detection Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor.
Troubleshooting SiUS12-928_A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check No.06 Refer to P.152 Check the air passage. YES Are there any short circuits? Provide sufficient air passage. NO Check the air filter. Is it very dirty? YES Clean the air filter. NO Check the dust accumulation on the indoor heat exchanger. Is it very dirty? YES Clean the indoor heat exchanger. NO Check No.
SiUS12-928_A 5.5 Troubleshooting Fan Motor or Related Abnormality 5.5.1 AC Motor (Slim Duct Built-in System) Remote Controller Display A6 Method of Malfunction Detection The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Malfunction Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
Troubleshooting SiUS12-928_A 5.5.2 DC Motor (Duct-Free System) Remote Controller Display A6 Method of Malfunction Detection The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Malfunction Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
SiUS12-928_A Troubleshooting Troubleshooting Caution Check No.01 Refer to P.149 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power supply and rotate the fan by hand. Does the fan rotate smoothly? NO Replace the fan motor. YES Turn the power on and start operation. Does the fan rotate? Turn off the power supply NO and disconnect the fan motor connector, then turn the power on.
Troubleshooting 5.6 SiUS12-928_A Thermistor or Related Abnormality (Indoor Unit) Remote Controller Display C4, C9 Method of Malfunction Detection The temperatures detected by the thermistors are used to determine thermistor errors. Malfunction Decision Conditions The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Supposed Causes Disconnection of connector Defective thermistor Defective indoor unit PCB Troubleshooting Check No.06 Refer to P.
SiUS12-928_A 5.7 Troubleshooting Signal Transmission Error (between Indoor and Outdoor Units) Remote Controller Display U4 Method of Malfunction Detection The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked whether it is normal. Malfunction Decision Conditions The data sent from the outdoor unit cannot be received normally, or the content of the data is abnormal.
Troubleshooting SiUS12-928_A Troubleshooting Caution Check No.10 Refer to P.155 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the indoor unit - outdoor unit connection wires. Is there any wiring error? YES Correct the indoor unit outdoor unit connection wires. NO Check the voltage of the indoor unit-outdoor unit connection wires between No. 1 and No. 3, and between No. 2 and No. 3.
SiUS12-928_A 5.8 Troubleshooting Unspecified Voltage (between Indoor and Outdoor Units) Remote Controller Display UA Method of Malfunction Detection The supply power is detected for its requirements (different from pair type and multi type) by the indoor / outdoor transmission signal. Malfunction Decision Conditions The pair type and multi type are interconnected.
Troubleshooting 5.9 SiUS12-928_A Anti-icing Function Remote Controller Display A5 Outdoor Unit LED Display A Method of Malfunction Detection During cooling operation, indoor unit icing is detected by checking the temperatures sensed by the indoor heat exchanger thermistor and the room temperature thermistor that are located in a shutdown room. Malfunction Decision Conditions In cooling operation, the both conditions (A) and (B) are met for 5 minutes.
SiUS12-928_A Troubleshooting Troubleshooting Caution Check No.04 Refer to P.150 Check No.06 Refer to P.152 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the wiring and piping. Wrong wiring or piping? YES Activate the wiring error check mode. NO Check No. 04 Check the electronic expansion valve. Functioning? NO Replace the electronic expansion valve or coil. YES Check No. 06 Check the outdoor heat exchanger thermistor.
Troubleshooting SiUS12-928_A 5.10 Outdoor Unit PCB Abnormality (24/32 Class) Remote Controller Display E1 Outdoor Unit LED Display A Method of Malfunction Detection Detect within the program of the microcomputer. Malfunction Decision Conditions The program of the microcomputer is in abnormal running order.
SiUS12-928_A Troubleshooting 5.11 OL Activation (Compressor Overload) Remote Controller Display E5 Outdoor Unit LED Display A Method of Malfunction Detection A compressor overload is detected through compressor OL. Malfunction Decision Conditions If the error repeats twice, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error ∗ The operating temperature condition is not specified.
Troubleshooting SiUS12-928_A 5.12 Compressor Lock Remote Controller Display E6 Outdoor Unit LED Display A5 11 24 34 41 Method of Malfunction Detection A compressor lock is detected by checking the compressor running condition through the position detection circuit. Malfunction Decision Conditions Judging from the current waveform generated when high-frequency voltage is applied to the compressor. If the error repeats 16 times, the system is shut down.
SiUS12-928_A Troubleshooting 5.13 DC Fan Lock Remote Controller Display E7 Outdoor Unit LED Display A5 14 24 34 44 Method of Malfunction Detection An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Malfunction Decision Conditions The fan does not start in 30 seconds even when the fan motor is running. If the error repeats 16 times, the system is shut down.
Troubleshooting SiUS12-928_A 5.14 Input Overcurrent Detection Remote Controller Display E8 Outdoor Unit LED Display A5 11 24 31 44 Method of Malfunction Detection Detected by checking the input current value Malfunction Decision Conditions The input current is at a certain value (depending on the condition) for 2.5 seconds. The compressor halts if the error occurs, and restarts automatically after 3-minute standby.
SiUS12-928_A Troubleshooting Troubleshooting Caution Check No.07 Refer to P.153 Check No.08 Refer to P.154 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. ∗ An input overcurrent may result from wrong internal wiring. If the wires have been disconnected and reconnected, and the system is interrupted by an input overcurrent, take the following procedure. Check No. 07 Check the installation condition.
Troubleshooting SiUS12-928_A 5.15 Four-Way Valve Abnormality (18 Class) Remote Controller Display EA Outdoor Unit LED Display A5 14 21 31 41 Method of Malfunction Detection The liquid pipe thermistor, the outdoor temperature thermistor and the outdoor heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode. Malfunction Decision Conditions Either of the following conditions occurs 6 minutes after the compressor has started.
SiUS12-928_A Troubleshooting Troubleshooting Caution Check No.05 Refer to P.151 Check No.06 Refer to P.152 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Four way valve coil disconnected (loose)? Correct it. NO Harness out of connector? Check No.11 Refer to P.155 YES YES Reconnect it. NO Check the continuity of the four way valve coil and harness. Disconnect the harness from the connector.
Troubleshooting SiUS12-928_A 5.16 Discharge Pipe Temperature Control Remote Controller Display F3 Outdoor Unit LED Display A5 14 21 34 41 Method of Malfunction Detection Detected by the discharge pipe thermistor Malfunction Decision Conditions If the temperature detected by the discharge pipe thermistor rises above , the compressor stops. The error is cleared when the discharge pipe temperature is dropped below .
SiUS12-928_A Troubleshooting 5.17 High Pressure Control in Cooling Remote Controller Display F6 Outdoor Unit LED Display A5 14 21 34 44 Method of Malfunction Detection High-pressure control (operation halt, frequency drop, etc.) is activated in cooling mode if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit.
Troubleshooting SiUS12-928_A Troubleshooting Caution Check No.04 Refer to P.150 Check No.06 Refer to P.152 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the installation space. Check No. 07 Check the installation condition. NG OK Check No.07 Refer to P.153 Check No. 09 Check the outdoor fan. NG OK Check No.08 Refer to P.154 Check No. 08 Check the discharge pressure. NG Change the installation location or direction.
SiUS12-928_A Troubleshooting 5.18 Compressor Sensor System Abnormality (24/32 Class) Remote Controller Display H0 Outdoor Unit LED Display A5 14 24 31 41 Method of Malfunction Detection Fault condition is identified by the supply voltage and the DC voltage which is detected before the compressor startup. Fault condition is identified by the compressor current which is detected right after the compressor startup. If the error repeats 16 times, the system is shut down.
Troubleshooting SiUS12-928_A Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Reactor connection check Connection OK? NO Connect properly. YES Compressor connection check Connection OK? NO Connect properly. YES Disconnect the reactor from the outdoor unit PCB and measure the resistance value between reactor terminals with tester. Reactor check 10Ω or less? NO Replace the reactor.
SiUS12-928_A Troubleshooting 5.19 Position Sensor Abnormality Remote Controller Display H6 Outdoor Unit LED Display A5 14 24 31 41 Method of Malfunction Detection A compressor startup failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Decision Conditions If the error repeats 8 times, the system is shut down.
Troubleshooting Troubleshooting Check No.29 Refer to P.158 SiUS12-928_A 18 class Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Voltage as rated? NO Correct the power supply. YES Check No. 29 Check the short circuit of the diode bridge. Normal? NO Replace the outdoor unit PCB or the outdoor fan. YES Check the connection.
SiUS12-928_A Troubleshooting Troubleshooting 24/32 class Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Voltage as rated? NO Correct the power supply. YES Check the connection. Electrical components or compressor harnesses connected as specified? NO Reconnect them as specified. YES Turn on the power. Check the electrolytic capacitor voltage.
Troubleshooting SiUS12-928_A 5.20 CT or Related Abnormality Remote Controller Display H8 Outdoor Unit LED Display A Method of Malfunction Detection A CT or related error is detected by checking the compressor running frequency and CT-detected input current. Malfunction Decision Conditions The compressor running frequency is more than 1 2 3 4 (Hz) 18 class 55 24/32 class 32 (A) 1.25 0.5 Hz and input current is below A. If the error repeats 4 times, the system is shut down.
SiUS12-928_A Troubleshooting Troubleshooting Check No.12 Refer to P.156 Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power and turn it on again. Start operation. ∗ Running current as shown at right with relay cable 1 or 2? YES Current (guideline) Replace the outdoor unit PCB. Capacitor charged when the indoor unit or outdoor unit main relay turns on NO Rising with increasing frequency Check No.
Troubleshooting SiUS12-928_A 5.21 Thermistor or Related Abnormality (Outdoor Unit) Remote Controller Display H9, J3, J6, J8, J9, P4 Outdoor Unit LED Display A Method of Malfunction Detection This type of error is detected by checking the thermistor input voltage to the microcomputer. A thermistor error is detected by checking the temperature sensed by each thermistor. Malfunction Decision Conditions The thermistor input is above 4.96 V or below 0.04 V with the power on.
SiUS12-928_A Troubleshooting Troubleshooting Caution Check No.06 Refer to P.152 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn on the power again. Error displayed again on remote controller? NO Reconnect the connectors or thermistors. YES Check No. 06 Check the thermistor resistance value.
Troubleshooting SiUS12-928_A 5.22 Electrical Box Temperature Rise Remote Controller Display L3 Outdoor Unit LED Display A Method of Malfunction Detection An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Malfunction Decision Conditions With the compressor off, the radiation fin temperature is above . The error is cleared when the temperature drops below .
SiUS12-928_A Troubleshooting Troubleshooting 18 class Caution Check No.06 Refer to P.152 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. WARNING To cool the electrical components, the outdoor fan starts when the radiation fin temperature rises above and stops when it drops below . Turn off the power and turn it on again. Check No.07 Refer to P.153 Error again or outdoor fan activated? Check No.09 Refer to P.154 YES NO Check No.
Troubleshooting Troubleshooting SiUS12-928_A 24/32 class Caution Check No.07 Refer to P.153 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. WARNING Turn off the power and turn it on again. Check No.09 Refer to P.154 Error again or outdoor fan activated? To cool the electrical components, the outdoor fan starts when the radiation fin temperature rises above and stops when it drops below . YES NO Check the radiation fin temperature.
SiUS12-928_A Troubleshooting 5.23 Radiation Fin Temperature Rise Remote Controller Display L4 Outdoor Unit LED Display A Method of Malfunction Detection A radiation fin temperature rise is detected by checking the radiation fin temperature with the compressor on. Malfunction Decision Conditions The radiation fin temperature with the compressor on is above The error is cleared when the temperature drops below .
Troubleshooting Troubleshooting SiUS12-928_A 18 class Caution (Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Check No.06 Refer to P.152 Check No.07 Refer to P.153 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power and turn it on again to start the system. Check No.09 Refer to P.
SiUS12-928_A Troubleshooting Troubleshooting 24/32 class Caution Check No.07 Refer to P.153 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power and turn it on again to start the system. Check No.09 Refer to P.154 Error displayed again? YES Has PCB been replaced? NO YES NO ∗ Silicon grease Part No.: 1172698 Check the radiation fin temperature. Above ? YES Check No. 09 Check the outdoor fan or related.
Troubleshooting SiUS12-928_A 5.24 Output Overcurrent Detection Remote Controller Display L5 Outdoor Unit LED Display A Method of Malfunction Detection An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Decision Conditions A position signal error occurs while the compressor is running. A speed error occurs while the compressor is running.
SiUS12-928_A Troubleshooting Troubleshooting Caution Check No.07 Refer to P.153 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. ∗ An output overcurrent signal may result from wrong internal wiring. If the wires have been disconnected and reconnected and the system is interrupted by an output overcurrent, take the following procedure. Check No. 07 Check the installation condition. Check No.08 Refer to P.
Troubleshooting SiUS12-928_A 5.25 Refrigerant Shortage Remote Controller Display U0 Outdoor Unit LED Display A Method of Malfunction Detection Refrigerant shortage detection I : Refrigerant shortage is detected by checking the input current value and the compressor output frequency. If the refrigerant is short, the input current is smaller than the normal value.
SiUS12-928_A Troubleshooting Troubleshooting 18 class Caution Check No.04 Refer to P.150 Check No.06 Refer to P.152 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Any thermistor disconnected? NO Stop valve closed? YES Replace them in position. * Discharge pipe thermistor * Indoor or outdoor heat exchanger thermistor * Room temperature thermistor * Outdoor temperature thermistor YES Open the stop valve.
Troubleshooting Troubleshooting SiUS12-928_A 24/32 class Caution Check No.04 Refer to P.150 Check No.06 Refer to P.152 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Any thermistor disconnected? NO Stop valve closed? YES Replace them in position. * Discharge pipe thermistor * Indoor or outdoor heat exchanger thermistor * Room temperature thermistor * Outdoor temperature thermistor YES Open the stop valve.
SiUS12-928_A Troubleshooting 5.26 Low-voltage Detection or Over-voltage Detection Remote Controller Display U2 Outdoor Unit LED Display A Method of Malfunction Detection Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. 1 2 3 4 Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit.
Troubleshooting SiUS12-928_A 5.27 Signal Transmission Error (on Outdoor Unit PCB) (24/32 Class) Remote Controller Display U7 Outdoor Unit LED Display A Method of Malfunction Detection Communication error between microcomputer mounted on the main PCB and PM1. Malfunction Decision Conditions The abnormality is determined when the data sent from the PM1 can not be received for 9 seconds. The error counter is reset when the data from the PM1 can be successfully received.
SiUS12-928_A Troubleshooting 5.28 Unspecified Voltage (between Indoor and Outdoor Units) / Anti-icing Function in Other Rooms UA, UH Remote Controller Display Outdoor Unit LED Display A Method of Malfunction Detection A wrong connection is detected by checking the combination of indoor and outdoor units on the microcomputer.
Check SiUS12-928_A 6. Check 6.1 How to Check 6.1.1 Fan Motor Connector Output Check Check No.01 1. 2. 3. 4. 5. Check the connection of connector. Check motor power supply voltage output (pins 4 - 7). Check motor control voltage (pins 4 - 3). Check rotation command voltage output (pins 4 - 2). Check rotation pulse input (pins 4 - 1).
SiUS12-928_A Check 6.1.2 Electronic Expansion Valve Check Check No.04 Conduct the followings to check the electronic expansion valve (EV). 1. Check to see if the EV connector is correctly inserted in the PCB. Match the EV unit number and the connector number. 2. Turn the power off and on again, and check to see if all the EVs generate latching sound. 3. If any of the EVs does not generate latching sound in the above step 2, disconnect that connector and check the continuity using a tester.
Check SiUS12-928_A 6.1.3 Four-Way Valve Performance Check Check No.05 Turn off the power and turn it on again. Start heating operation. S80 voltage at 208/230 VAC with compressor on? (Fig. 1) ∗ Four way valve coil Cooling / dry : No continuity Heating : Continuity NO Replace the outdoor unit PCB. YES Disconnect the connector for the four way valve coil and check the continuity. Four way valve coil resistance at 1000 ~ 2000 Ω? NO YES Replace the four way valve coil. Replace the four way valve.
SiUS12-928_A Check 6.1.4 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 graph and the table below. Thermistor R25°C (77°F) = 20 kΩ B = 3950 Temperature (°C / °F) –20 / –4 211.0 (kΩ) –15 / 5 –10 / 14 150.0 116.5 –5 / 23 0 / 32 88.0 67.2 5 / 41 10 / 50 51.9 40.0 15 / 59 20 / 68 31.8 25.0 25 / 77 30 / 86 20.
Check SiUS12-928_A 6.1.5 Installation Condition Check Check No.07 Installation condition check Check the allowable dimensions of the air suction and discharge area. NG Change the installation location or direction. OK Does the discharged air from other outdoor unit cause an increase of the suction air temperature? YES Change the installation location or direction. NO Is the heat exchanger very dirty? YES Clean the heat exchanger.
SiUS12-928_A Check 6.1.6 Discharge Pressure Check Check No.08 Discharge pressure check NO High? Replace the compressor. YES NO Is the stop valve open? Open the stop valve. YES YES Is the connection pipe deformed? Replace the pipe installed at the site. NO Is the air filter or indoor/outdoor heat exchanger dirty? Not dirty Dirty Clean the dirty one. Replace the compressor. (R11718) 6.1.7 Outdoor Unit Fan System Check Check No.09 DC motor Check the outdoor unit fan system.
Check SiUS12-928_A 6.1.8 Power Supply Waveforms Check Check No.10 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance. Check to see if the power supply waveform is a sine wave (Fig.1). Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2) [Fig.1] [Fig.2] 6.1.9 Inverter Units Refrigerant System Check Check No.
SiUS12-928_A Check 6.1.10 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. 18 class Multimeter (DC.
Check SiUS12-928_A 6.1.12 Main Circuit Electrolytic Capacitor Check Check No.14 Never touch any live parts for at least 10 minutes after turning off the circuit breaker. If unavoidably necessary to touch a live part, make sure there is no DC voltage using the tester. Check the continuity with the tester. Reverse the pins and make sure there is continuity. 6.1.13 Rotating Pulse Input on the Outdoor Unit PCB Check Check No.15 Make sure that the voltage of 320 ± 30 V is applied.
SiUS12-928_A Check 6.1.14 Hall IC Check Check No.16 1. Check the connector connection. 2. With the power on, operation off, and the connector connected, check the following. ∗Output voltage of about 5 V between pins 1 and 3. ∗Generation of 3 pulses between pins 2 and 3 when the fan motor is operating. If NG in step 1 Defective PCB Replace the PCB. If NG in step 2 Defective Hall IC Replace the fan motor. If OK in both steps 1 and 2 Replace the PCB.
SiUS12-928_A Part 7 Removal Procedure 1. Outdoor Unit – 2MXS18GVJU ................................................................161 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Removal of the Outer Panels ................................................................... 161 Removal of the Electrical Box .................................................................. 162 Removal of the PCB................................................................................. 166 Removal of the Fan Motor..............
SiUS12-928_A Removal Procedure 160
Outdoor Unit – 2MXS18GVJU SiUS12-928 1. Outdoor Unit – 2MXS18GVJU 1.1 Removal of the Outer Panels Procedure Warning Procedure Step 1 External appearance 2 Remove the 4 screws of the top panel and the 6 screws of the front panel. Remove the 4 screws of the discharge grille. 3 Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Points Top panel Discharge grille Front panel 4 (R10351) Remove the 2 screws of the piping cover.
SiUS12-928 1.2 Outdoor Unit – 2MXS18GVJU Removal of the Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points The US model has a service lid on the right side panel. Remove the 2 screws to remove the service lid. 1. Disconnect the connection wires. 1 The figure shows the connection wires.
Outdoor Unit – 2MXS18GVJU SiUS12-928 Procedure Step 2. Disconnect the harnesses 1 Disconnect the 2 connectors of the electronic expansion valve coil lead wires (S20, S21). Points Connector S20 (White) S21 (Red) Electronic expansion valve No. EVA EVB Harness length 630 730 When reconnecting, make sure to match the wire to the correct connector. 2 Disconnect the four-way valve coil connector (S80).
SiUS12-928 Procedure Step 5 Outdoor Unit – 2MXS18GVJU Points Disconnect the reactor lead wires. 3. Removal of the electrical box. 1 Remove the 1 screw on the right side of the electrical box. (R10361) 2 Remove the 1 screw on the front of the electrical box. 3 Remove the drip proof cover.
Outdoor Unit – 2MXS18GVJU Procedure Step 4 5 165 SiUS12-928 Disconnect the connector for the fan motor (S70) from the inverter PCB. Rlease the fan motor lead wire. Points Inverter PCB Lift up the electrical box and dismount it.
SiUS12-928 1.3 Outdoor Unit – 2MXS18GVJU Removal of the PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points 1. Removal of the control PCB 1 Remove the 1 screw of the PCB, and unfasten the 2 hooks. 2 Unfasten the hook of the terminal board, and open the terminal board. 3 Disconnect each connector on the back of the terminal board (S11, HL, HN).
Outdoor Unit – 2MXS18GVJU Procedure Step 4 Disconnect the connectors on the service monitor PCB (S52, S102). 5 Lift up the main PCB. 167 SiUS12-928 Points Unfasten the hooks to remove the service monitor PCB.
SiUS12-928 Outdoor Unit – 2MXS18GVJU Procedure Step 6 Points For details, refer to page 21. Disconnect the connectors (S31, S32, S33, S71, H1, H2). S31 S32 S71 S33 (R10362) H1 (yellow) H2 (blue) (R10363) 7 The figure shows the main PCB. FU2: Glass tube fuse 3.
Outdoor Unit – 2MXS18GVJU Procedure Step 8 SiUS12-928 Points Unfasten the 2 hooks and remove the service monitor PCB. Priority room setting switch (SW4) Wiring error check switch (SW3) Forced operation ON/OFF switch (SW1) NIGHT QUIET mode setting switch (SW5) Operation mode switch (SW2) 9 Remove the 7 screws to remove the inverter PCB. Inverter PCB Fuse (3.
SiUS12-928 1.4 Outdoor Unit – 2MXS18GVJU Removal of the Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points When reassembling, align mark of propeller fan with D-cut section of motor shaft. Disconnect the connector for the fan motor and release the fan motor lead wire. 1 Remove the washer-fitted nut and remove the outdoor fan.
Outdoor Unit – 2MXS18GVJU 1.5 SiUS12-928 Removal of the Sound Blanket Procedure Warning Procedure Step 1 Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Points Remove the 5 screws of the right side panel. Right side panel (R10364) 2 Remove the 2 screws of the partition plate, and remove it.
SiUS12-928 Procedure Step 3 Outdoor Unit – 2MXS18GVJU Remove the sound blankets (top upper, top inner, outer, and inner). Points Carefully remove the sound blanket, which is easily torn in the piping section.
Outdoor Unit – 2MXS18GVJU 1.6 Removal of the Coils and Thermistors Procedure 2 Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 SiUS12-928 Remove the screw and remove the four-way valve coil. Points Four way valve coil Remove the screw and remove the defrost solenoid valve coil. Defrost solenoid valve coil 3 4 Pull out the electronic expansion valve coil for each room.
SiUS12-928 Outdoor Unit – 2MXS18GVJU Procedure Step Points 5 Take off the putty, and remove each thermistor. Place the thermistor so that its end comes up to the end of the fixture. Be careful not to lose the clip or fixture for thermistors. 6 Remove the wire harnesses.
Outdoor Unit – 2MXS18GVJU 1.7 SiUS12-928 Removal of the Four-Way Valve and Defrost Solenoid Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 Remove the screw of the four-way valve coil to remove the coil. 2 Remove the screw and remove the defrost solenoid valve coil. Points Warning 1. Be careful to not burn yourself with pipes and other parts that are heated by the gas brazing machine. 2.
SiUS12-928 Outdoor Unit – 2MXS18GVJU Procedure Step Points Before proceding, make sure there is no refrigerant gas left in the refrigerant pipes. 6 Disconnect the 2 brazed points, first (e), and then (f). Remove the defrost solenoid valve. Caution Be careful not to burn yourself with the pipes and other parts that are heated by the gas welding rod. Note: Do not use a metal saw for cutting pipes because sawdust enters the circuit.
Outdoor Unit – 2MXS18GVJU 1.8 SiUS12-928 Removal of the Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 Remove the terminal cover. 2 Disconnect the compressor lead wires. 3 Remove the 2 sheets of putty. Points Be careful to avoid burning the compressor terminals or the nameplate. 4 Remove the 3 nuts with an open-end spanner.
SiUS12-928 Procedure Step Before working, make sure that the refrigerant is empty in the circuit. Be sure to apply nitrogen replacement when heating up the brazed part. 5 Disconnect the brazed part (a) at discharge side of the compressor. 6 Disconnect the brazed part (b) at suction side of the compressor. 7 Lift the compressor up and remove it. Note: Do not use a metal saw for cutting pipes because the sawdust comes into the circuit. . .
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU SiUS12-928 2. Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU 2.1 Removal of the Outer Panels Procedure Warning Procedure Step 1 Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Points External appearance. (R6368) 1. Removal of the suction grille. 1 Unfasten the 2 hooks at the bottom first. The hooks are secured in the clearances of the heat exchanger fins.
SiUS12-928 Procedure Step 2 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Slide the suction grille downward to unfasten the 3 top hooks. Points Hooks (R6371) 3 Remove the suction grille. (R6372) 2. Removal of the top panel. 1 Remove the 4 screws on the back and the 1 screw on the left side panel.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 2 SiUS12-928 Points Remove the 2 screws on the front and the 1 screw on the right side panel. Right side panel (R6374) 3 Lift the top panel and remove it. (R6375) 3. Removal of the right side panel. 1 Remove the 5 screws.
SiUS12-928 Procedure Step 2 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Slide the panel downward to release the 2 hooks on the back side.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 3 SiUS12-928 Points The US model has a service lid on the stop valve mounting plate. Remove the 2 screws to remove the service lid. Remove the right side panel. Screw Service lid (R10372) (R10441) Right side panel 4. Removal of the front panel (2). 1 Remove the 2 screws.
SiUS12-928 Procedure Step 2 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Slide the front panel (2) panel downward to unfasten the hook. (R10374) (R6383) 3 Remove the front panel (2).
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU SiUS12-928 Procedure Step 5. Removal of the front panel (1). 1 Remove the 4 screws on the discharge grille. Points Remove the discharge grille and propeller fan first to remove the front panel (1). Front Panel (1) Discharge grille (R10376) 2 Pull the bottom of the discharge grille toward yourself.
SiUS12-928 Procedure Step 3 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Slide the discharge grille downward to unfasten the 2 hooks at the top. (R10378) Hooks (R10379) 4 Remove the discharge grille. (R10380) 5 Nut size : M8 Remove the washer-fitted nut and remove the outdoor fan.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 6 SiUS12-928 Remove the 2 screws on the partition plate (1). Points Partition plate (1) (R10382) 7 Remove the screw at the bottom left of the front. Front panel (1) (R10383) 8 Remove the screw at the bottom of the left side.
SiUS12-928 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 9 Remove the screw at the bottom of the back side. 10 Lift the front panel (1) to unfasten the hook.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 11 SiUS12-928 Points Remove the front panel (1). (R10385) Be sure to detach the front panel (1) carefully so as not to deform it. (R6396) 6. Removal of the rear panel 1 Remove the screw on the partition plate (2).
SiUS12-928 Procedure Step 2 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Slide the partition plate (2) to the left, and remove it. (R10387) 3 The holder is secured in the clearances of the heat exchanger fins. Undo the holder of the thermistor.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 4 SiUS12-928 Points Release the thermistor wire from the groove Groove (R10389) 5 Remove the 3 screws on the rear panel. 6 Remove the screw on the bottom frame.
SiUS12-928 Procedure Step 7 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Remove the screw on the stop valve mounting plate. Stop valve mounting plate (R10392) 8 Lift the rear panel upward to unfasten the 2 hooks. Hooks (R10393) 9 Remove the rear panel.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU 2.2 Removal of the Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 SiUS12-928 Points Remove the 2 screws to detach the grounds. (R10396) 2 Disconnect the connector for the fan motor [S70]. [S70] (R6414) (R10397) 3 Release the fan motor lead wire.
SiUS12-928 Procedure Step 4 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Pull out the clamp. Disconnect the connector for the four-way valve coil [S80]. S80 Clam (R10398) 5 Disconnect the 4 connectors for the electronic expansion valve coils (for room A, B, C, D). A B C D Clamp 6 Disconnect the connector for the liquid pipe thermistor [S93]. A : [S20] (white) B : [S21] (red) C : [S22] (blue) D : [S23] (yellow) The 3MXS model does not have [S23]. Pull out the clamp.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 8 SiUS12-928 Disconnect the connector for the thermistors [S90] Points Pull out the clamp. S90 (R10538) 9 Pull out the clamp. The wire harness of the thermistors is hooked under the electrical box. Unhook it and pull out the clamp. Hook Clamp (R6420) 10 Disconnect the connector for the overload protector [S40]. Pull out the clamp.
SiUS12-928 Procedure Step 11 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points The wire harness for the compressor is attached to the partition plate (1) by the clamp. Clamp (R6422) 12 Pull out the clamp with pliers Clamp 13 Disconnect the relay connector of the compressor.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 14 SiUS12-928 Remove the screw on the stop valve mounting plate. Points Electrical box Stop valve mounting plate (R10395) 15 Remove the screw on the partition plate (1). Partition plate (1) (R6411) 16 Slide the electrical box leftward to unfasten the hook on the right side.
SiUS12-928 Procedure Step 17 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Lift up the electrical box to remove it.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU 2.3 SiUS12-928 Removal of the PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1. Removal of the control PCB 1 Open the cover of the electrical box. Points Hooks Unfasten the 4 hooks. The hooks are marked with: Hooks (R10403) (R6427) 2 Remove the 3 screws. Control PCB (R10404) 3 Unfasten the 4 hooks.
SiUS12-928 Procedure Step 4 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Lift up the main PCB. (R10406) 5 Disconnect the connectors. Refer to page 21 for details. U(red) V(yellow) W(blue) S51 S101 S10 HR2(blue) AC2 (blue) AC1 (brown) HR1(white) [S51] [S101] : service monitor PCB [S10] : terminal board (transmission) [HR1] [HR2] : reactor [AC1] [AC2] : terminal board (power supply) [U] [V] [W] : compressor (R10407) 6 Remove the main PCB. (R10408) 2.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 2 SiUS12-928 Points Remove the 3 screws and lift the reactor upward to remove it. (R6434) 3. Removal of the service monitor PCB. 1 Disconnect the connectors from the service monitor PCB (S52, S102). S102 S52 Service monitor PCB (R10410) 2 Slightly lift the top hook to unfasten.
SiUS12-928 Procedure Step 3 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Unfasten the bottom hook to remove the service monitor PCB. (R6437) 4. Removal of the terminal board. 1 Remove the screw. Terminal board (R10411) 2 Unfasten the hook.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 3 SiUS12-928 Points Remove the terminal board.
SiUS12-928 2.4 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Removal of the Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points (R10414) 1 Remove the 2 lower screws at the bottom. 2 Remove the 2 upper screws. Be sure to remove the lower screws first. If the upper screws are removed first, the fan motor may tilt or fall because the center of its gravity is toward the front. It may cause injuries.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU 2.5 SiUS12-928 Removal of the Coils and Thermistors Procedure Warning Step Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points 1. Removal of the electronic expansion valve coil 1 Pull the electronic expansion valve coils out.
SiUS12-928 Step Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Points 2. Removal of the thermistors 1 Pull out the gas pipe thermistors. Gas pipe thermistors (R10416) Gas pipe thermistor Be careful not to lose the clips for the thermistors.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 2 SiUS12-928 Points Peel the putty, and pull out the liquid pipe thermistors. Liquid pipe thermistors (R10417) Be careful not to lose the fixtures for the thermistors. Liquid pipe thermistor (R6450) 3 Pull out the heat exchanger thermistor.
SiUS12-928 Procedure Step 4 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Be careful not to lose the clip for the thermistor. Remove the clip from the heat exchanger thermistor. Clip (R6452) 5 Slightly open the sound blanket (outer). Sound blanket (outer) 6 (R10418) Remove the sound blanket (top upper).
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU SiUS12-928 Procedure Step 7 Remove the discharge pipe thermistor. 8 Remove the fixture. Discharge pipe thermistor Points (R10420) Fixture (R10430) 3. Removal of the four-way valve coil 1 Remove the screw.
SiUS12-928 Procedure Step 2 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Remove the four-way valve coil.
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU 2.6 Removal of the Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 SiUS12-928 Open the sound blanket (outer). Sound blanket (outer) 2 Points (R10433) The sound blanket is fragile. Carefully pass the discharge pipe through it. Remove the sound blanket (top upper).
SiUS12-928 Procedure Step 4 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points The sound blanket is fragile. Remove the sound blanket (outer). Sound blanket (outer) 5 The sound blanket is fragile. Carefully pass the discharge pipe through it. Remove the sound blanket (top inner). Sound blanket (top inner) 6 (R10436) (R10437) Open the sound blanket (inner) and pass it through the mufflers. The sound blanket is fragile. Be careful of the notches of the compressor mount (3 locations).
Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Procedure Step 7 SiUS12-928 Points Remove the sound blanket (inner).
SiUS12-928 2.7 Removal of the Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 Outdoor Unit – 3MXS24JVJU / 4MXS32GVJU Points Remove the terminal cover. Terminal cover (R6466) 2 3 Disconnect the compressor lead wires. Remove the overload protector. U : red, V : yellow, W : blue U(red) W(blue) V(yellow) Overload protector (R9471) 4 Disconnect the pipings, referring to page 177.
SiUS12-928_A Part 8 Trial Operation and Field Settings 1. Trial Operation ........................................................................................217 2. Wiring Error Check Function ...................................................................219 3. Field Settings ..........................................................................................221 3.1 3.2 3.3 3.4 Priority Room Setting ...............................................................................
SiUS12-928_A Trial Operation and Field Settings 216
Trial Operation SiUS12-928_A 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 test operation in accordance with the Operation Manual to ensure that all functions and parts, such as louver movement, are working properly. The air conditioner requires a small amount of power in its standby mode.
SiUS12-928_A Trial Operation ARC433 Series (1) Press the ON/OFF button to turn on the system. (2) Press the center of the TEMP button and the MODE button at the same time. (3) Press the MODE button twice. ( is displayed on the display to indicate that trial operation is selected.) (4) Press the MODE button and select operation mode. (5) Trial operation terminates in approx. 30 minutes and switches into normal mode. To quit a trial operation, press the ON/OFF button.
Wiring Error Check Function SiUS12-928_A 2. Wiring Error Check Function Outline The convenient wiring error check function is designed for the microcomputer to correct wiring errors itself. If local wiring is unclear in the case of buried piping, for example, just press the wiring error check switch that is behind the right side panel of the outdoor unit. Even if the connections for Room A and Room B are confused, the system may run without a hassle.
SiUS12-928_A Wiring Error Check Function Checking the current setting data on the microcomputer memory Those data can be checked by looking at the service monitor LED indicators, when the wiring error checking is over, during forced operation, at the stop of the system. The LED indicators stop blinking when the forced operation is over. LED1…Room A wiring, LED2…Room B wiring 1st blinking LED…Port A piping, 2nd blinking LED…Port B piping The 1st blinking LED means the room that is connected with Port A.
Field Settings SiUS12-928_A 3. Field Settings 3.1 Priority Room Setting Electronic expansion valves are controlled to provide more capacity to the prioritized room. Setting method Turn off the circuit breaker before changing the setting. Only one room can be set as the priority room (By turning on one of A to D of SW4 on service monitor PCB of the outdoor unit). The control starts when all the following conditions are met. ∗ Priority room setting is made.
SiUS12-928_A 3.3 Field Settings NIGHT QUIET Mode If NIGHT QUIET mode is to be used, initial settings must be made when the unit is installed. Explain the function of NIGHT QUIET mode, as described below, to the customer, and confirm whether or not the customer wants to use NIGHT QUIET mode. NIGHT QUIET mode function reduces operating noise of the outdoor unit at nighttime. This function is useful if the customer is worried about the effects of the operating noise on the neighbors.
Field Settings 3.4 SiUS12-928_A 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 wireless remote controller can be set for different addresses. Both the indoor unit PCB and the wireless remote controller need alteration. Indoor Unit PCB Cut the jumper JA on PCB.
SiUS12-928_A Application of Silicon Grease to a Power Transistor and a Diode Bridge 4. Application of Silicon Grease to a Power Transistor and a Diode Bridge Applicable Models All outdoor units using inverter type compressor for room air conditioner. When the printed circuit board of an outdoor unit is replaced, it is required that silicon grease (*1) is applied to the heat radiation part (the contact point to the radiation fin) of the power transistor and diode bridge.
SiUS12-928_A Part 9 Appendix 1. Piping Diagrams..........................................................................................2 1.1 Indoor Unit.................................................................................................... 2 1.2 Outdoor Unit ................................................................................................. 3 2. Wiring Diagrams..........................................................................................5 2.1 Indoor Unit...........
SiUS12-928_A Appendix 226
Piping Diagrams SiUS12-928_A 1. Piping Diagrams 1.1 Indoor Unit CTXS07JVJU, CTXS09/12HVJU FTXS15/18HVJU INDOOR UNIT INDOOR UNIT (5/16CuT) (5/16CuT) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR ON HEAT EXCH. FIELD PIPING (1/4CuT) FIELD PIPING (3/8CuT) THERMISTOR ON HEAT EXCH.
SiUS12-928_A 1.
Piping Diagrams SiUS12-928_A 4MXS32GVJU OUTDOOR UNIT HEAT EXCHANGER 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT HEADER 3/8CuT 3/8CuT HEAT EXCHANGER(CONDENSER) THERMISTOR 5/16CuT DC FAN MOTOR MOTOR OPERATED LIQUID PIPE VALVE (A) THERMISTOR EVA (ROOM-A) 5/16CuT MOTOR OPERATED LIQUID PIPE FILTER VALVE (B) THERMISTOR (ROOM-B) EVB 5/16CuT MOTOR OPERATED LIQUID PIPE FILTER VALVE (C) THERMISTOR (ROOM-C) EVC 5/16CuT 3/8CuT 1/2CuT HEADER OUTDOOR TEMPERATURE THERMISTOR RECEIVER MOTOR O
SiUS12-928_A Wiring Diagrams 2. Wiring Diagrams 2.1 Indoor Unit CTXS07JVJU, CTXS09/12HVJU FIELD WIRING. PCB3 S27 S26 PCB1 1 H1 ~ ~ RECTIFIER Fu 3.15A H2 t° R1T S38 X1M BLK 1 WHT RED GRN / YLW H3 TRANSMISSION CIRCUIT 2 3 3 CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.
Wiring Diagrams SiUS12-928_A FDXS09/12DVJU X1M PCB1 PCB2 H1 F1U 3.15A V1TR LED LED LED S1 1 H1P H2P H3P S26 1 ( SIGNAL 10 2 RTH11 H3 6 S21 S1W RECEIVER ) 3 1 TRANSMISSION GND CIRCUIT S1 RED S7 10 1 2 S32 1 GRY BLK R1T C1 BRN BRN t° PPL WIRELESS REMOTE CONTROLLER M 1~ indoor BLU R2T : C1 : F1U : PROTECTIVE GROUND CAPACITOR(M1F) FUSE 2 RED 3 1 2 3 outdoor N=2 GRN / YLW GRN / YLW FIELD WIRING.
SiUS12-928_A 2.2 Wiring Diagrams Outdoor Unit 2MXS18GVJU GRN YLW Z3C FU201 MID2 L1R Z1C ORG HE ORG FIELD WIRING BLU V2 - H5PH4PH3PH2P H1P S2W S5W S1W S3W : FERRITE CORE Z1C~Z3C : TERMINAL STRIP X1M~X3M : ELECTRONIC EXPANSION VALVE COIL Y1E~Y2E : VARISTOR V2~V5 FU1, FU2.
Wiring Diagrams SiUS12-928_A 4MXS32GVJU L1R Z6C Z1C YLW 233 PM1 Z1C~Z6C X1M~X5M Y1E~Y4E V2, V3, V5, V9, V100 SA2 FU1, FU2, FU3 AC1, AC2 U, V, W, X11A E1, E2 HR1, HR2 SW3 Y1R : FERRITE CORE : TERMINAL STRIP : ELECTRONIC EXPANSION VALVE COIL : VARISTOR : SURGE ARRESTER : FUSE MRM10, MRM20 MRC/W R1T~R3T R4T~R7T R8T~R11T S2~S102 LED1~LED5 LEDA : MAGNETIC RELAY : THERMISTOR : CONNECTOR : PILOT LAMP BLK BLK t˚ t˚ BLU t˚ YLW Y4E t˚ GRY Y3E t˚ 4 S93 1 BLK Y2E t˚ RED Y1E t˚ R3T R2T R
SiUS12-928_A Appendix Wiring Diagrams 234
Daikin Industries, Ltd.’s products are manufactured for export to numerous countries throughout the world. Daikin Industries, Ltd. does not have control over which products are exported to and used in a particular country. Prior to purchase, please therefore confirm with your local authorized importer, distributor and/or retailer whether this product conforms tot he applicable standards, and is suitable for use, in the region where the product will be used.
