Page 1 SiUS04-921 Inverter Pair Wall Mounted Type H-Series [Applied Models]  Inverter Pair : Heat Pump...
Page 2: Table Of Contents
SiUS04-921 Inverter Pair Wall Mounted Type H-Series  Heat Pump Indoor Units FTXG09HVJU FTXG12HVJU FTXG15HVJU Outdoor Units RXG09HVJU RXG12HVJU RXG15HVJU 1. SAFETY CONSIDERATIONS............... vi Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............3 1. Specifications ..................4...
Page 3 SiUS04-921 Part 4 Function and Control............11 1. Description of Operation ...............12 1.1 Indoor Unit....................12 1.2 Outdoor Unit ...................13 2. Main Functions..................14 2.1 QUATERNITY Drying Operation ............14 2.2 Comfort Sleep Operation................16 2.3 Automatic Operation................18 2.4 Comfort Airflow Mode................19 2.5 Cooling Breeze Operation ..............20 2.6 Power-airflow Dual FlapsFins..............21 2.7 Wide-angle LouversFins.................21 2.8 3-D Airflow....................22...
Page 4 SiUS04-921 Part 5 System Configuration............53 1. Installation Manual ................54 1.1 Indoor Units ....................54 1.2 Outdoor Units ..................64 2. System Configuration................70 3. Instruction....................71 3.1 Remote Controller ..................71 3.2 Cooling · QUATERNITY DRYING Operation ........73 3.3 Heating Operation ..................74 3.4 AUTO Operation..................75 3.5 FLASH STREAMER AIR PURIFYING ·...
Page 5 SiUS04-921 2.23 Compressor Sensor System Abnormality ..........120 2.24 Position Sensor Abnormality ..............121 2.25 DC Voltage / DC Current Sensor Abnormality ........123 2.26 Thermistor System Abnormality ............124 2.27 Abnormal Temperature in Electrical Box..........126 2.28 Temperature Rise in Radiation Fin............128 2.29 Output Overcurrent................130 2.30 Insufficient Gas..................132 2.31 Over Voltage Protection / Low Voltage Protection .......134 2.32 Outdoor Unit PCB Abnormality or Communication Circuit Abnormality135...
Page 6 SiUS04-921 2. Outdoor Unit..................203 2.1 How to Check the Service Monitor (LED A) .........203 2.2 Removal of Propeller Fan / Fan Motor ..........205 2.3 Removal of Electrical Box ..............210 2.4 Removal of PCB...................214 2.5 Removal of Sound Blanket..............218 2.6 Removal of Thermistor Assembly ............220 2.7 Removal of Reactor / Partition Plate ............222 2.8 Removal of Four Way Valve..............224 2.9 Removal of the Expansion Valve ............226...
Page 7: Safety Considerations
SiUS04-921 Safety Considerations SAFETY CONSIDERATIONS Read these SAFETY CONSIDERATIONS carefully before • If refrigerant gas is discharged during repair work, performing any repair work. Comply with these safety do not touch the discharged refrigerant gas. The symbols without fail. refrigerant gas may cause frostbite. •...
Page 8 Safety Considerations SiUS04-921 leaking into the room. The refrigerant gas itself is • Do not use a joined power cable or an extension harmless, but it may generate toxic gases if it comes cord, or share the same power outlet with other into contact with flames.
Page 9 SiUS04-921 Safety Considerations viii Safety...
Page 10: Part
SiUS04-921 Part 1 List of Functions 1. Functions....................2 List of Functions...
Page 11: Functions
Functions SiUS04-921 1. Functions Category Functions Category Functions  Basic Inverter (with Inverter Power Control) Health & Air-Purifying Filter — Function Clean Operation Limit for Cooling (°FDB) Photocatalytic Deodorizing Filter — –4~ Air-Purifying Filter Operation Limit for Heating (°FWB) — with Photocatalytic Deodorizing Function ...
Page 12: Specifications
SiUS04-921 Part 2 Specifications 1. Specifications ..................4 Specifications...
Page 13: Specifications
Specifications SiUS04-921 1. Specifications 230V Indoor Units FTXG09HVJU FTXG12HVJU Models RXG09HVJU RXG12HVJU Outdoor Units Cooling Heating Cooling Heating Capacity Btu/h 9,000 (5,300~12,300) 12,000 (4,400~18,000) 12,000 (5,300~15,700) 16,000 (4,400~19,100) Rated (Min.~Max.) Moisture Removal Pt/h — — Running Current (Rated) 3.10 4.04 4.30...
Page 14 SiUS04-921 Specifications 230V Indoor Units FTXG15HVJU Model RXG15HVJU Outdoor Units Cooling Heating Capacity Btu/h 15,000 (5,300~18,000) 18,000 (4,400~21,200) Rated (Min.~Max.) Moisture Removal Pt/h — Running Current (Rated) 5.64 6.36 Power Consumption Rated (Min.~Max.) 1,160 (260~1,930) 1,320 (230~2,120) Power Factor 89.0 99.0 EER (Rated) Btu/h·W...
Page 15 Specifications SiUS04-921 Specifications...
Page 16: Printed Circuit Board
SiUS04-921 Part 3 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram........8 1.1 Indoor Unit....................8 1.2 Outdoor Unit ...................10 Printed Circuit Board Connector Wiring Diagram...
Page 17: Printed Circuit Board Connector Wiring Diagram
Printed Circuit Board Connector Wiring Diagram SiUS04-921 1. Printed Circuit Board Connector Wiring Diagram Indoor Unit Connectors A1P (Control PCB) 1) S1 Connector for fan motor 2) S21 Connector for centralized control (HA) 3) S32 Connector for heat exchanger thermistor (R1T) 4) S41 Connector for swing motor (horizontal, vertical) 5) S43...
Page 18 SiUS04-921 Printed Circuit Board Connector Wiring Diagram PCB Detail PCB(1): Control PCB LED A (R0001) PCB(2): Display PCB PCB(3): Signal Receiver / Transmitter PCB LED2 (R5946) (R10056) PCB(4): Humidity sensor PCB PCB(5): Streamer Unit PCB S402 S401 Humidity sensor S403 (R5948) (R5947) Printed Circuit Board Connector Wiring Diagram...
Page 19: Outdoor Unit
Printed Circuit Board Connector Wiring Diagram SiUS04-921 Outdoor Unit Connectors 1) S20 Connector for electronic expansion valve coil 2) S45 Connector for thermal fuse 3) S70 Connector for DC fan motor 4) S80 Connector for four-way valve coil 5) S90 Connector for thermistor (outdoor, heat exchanger, discharge pipe) Note:...
Page 20: Function And Control
SiUS04-921 Part 4 Function and Control 1. Description of Operation ...............12 1.1 Indoor Unit....................12 1.2 Outdoor Unit ...................13 2. Main Functions..................14 2.1 QUATERNITY Drying Operation............14 2.2 Comfort Sleep Operation................16 2.3 Automatic Operation................18 2.4 Comfort Airflow Mode................19 2.5 Cooling Breeze Operation ..............20 2.6 Power-airflow Dual Flaps ...............21 2.7 Wide-angle Louvers ................21 2.8 3-D Airflow....................23...
Page 21: Description Of Operation
Description of Operation SiUS04-921 1. Description of Operation Indoor Unit (Input) (Output) Indoor unit Room Temperature temperature Fan motor Indoor fan control thermistor control Transmit signals to outdoor unit When the airflow rate is set to change the frequency of "auto"...
Page 22: Outdoor Unit
SiUS04-921 Description of Operation Outdoor Unit (Input) (Output) Outdoor unit Discharge pipe Compressor thermistor Compressor ON/OFF control Four-way Outdoor air Compressor valve thermistor capacity control Frequency control 3 min. standby Heat exchanger function Fan motor thermistor Defrost control Electronic Switches to cooling cycle and defrosts.(Outdoor fan stops) expansion valve Four-way valve control...
Page 23: Main Functions
Main Functions SiUS04-921 2. Main Functions QUATERNITY Drying Operation Operation Dry Cooling QUATERNITY Drying (R10061) Refer to the operation manual for details.  Reheating dehumidifying method is applied. Features Powerful evaporator eliminates the humidity in your room exclusively. Dry cool air is mixed with warm air from the reheater, thereby blowing in optimal and comfortable dry air.
Page 24 SiUS04-921 Main Functions  Differences on QUANTERNITY drying and "dry cooling" operation QUANTERNITY Drying Dry Cooling Method Puts a pressure reducing device (solenoid valve) in As is the cooling mechanism, the Dry Cooling the center of the heat exchanger of indoor unit to Operation raises latent heat capacity with separate it into upper and lower side.
Page 25: Comfort Sleep Operation
Main Functions SiUS04-921 Comfort Sleep Operation Operation Set the time to wake up. COMFORT SLEEP (R10064)  Effective mode for COMFORT SLEEP operation • Cooling • Dry cooling • Heating Refer to the operation manual for details.  Outline of function Features The temperature is controlled in unique V-shape pattern within the range of about 2°C (3.6°F) upper and lower.
Page 26 SiUS04-921 Main Functions  Human sleep  Sleep cycle and change in body temperature Temperature shift (˚C/˚F) 38/100.4 37/98.6 36/96.8 Sharp lowering of Maximum difference body temperature Rising of body of change in body Sleep cycle after falling asleep temperature before temperature wake-up Awakening...
Page 27: Automatic Operation
Main Functions SiUS04-921 Automatic Operation Operation AUTO operation (R10068) Refer to the operation manual for details. Features When the AUTO mode is selected with the remote controller, the microcomputer automatically determines the operation mode from cooling and heating according to the room temperature and setting temperature at the time of the operation startup, and automatically operates in that mode.
Page 28: Comfort Airflow Mode
SiUS04-921 Main Functions Comfort Airflow Mode  Effective mode for comfort airflow mode Operation Comfort Airflow (R10070 • Heating • Auto / Cooling • QUATERNITY drying • Dry cooling  Fin motion • Upper and lower fins halt at the fixed position of the upper side or lower side of the swing. •...
Page 29: Cooling Breeze Operation
Main Functions SiUS04-921 Cooling Breeze Operation Operation Cooling breeze (R10071  Effective mode for cooling breeze airflow • Auto / Cooling • QUATERNITY drying • Dry cooling • Flash streamer air purifying Note In automatic mode, when actual operation mode is heating, this cool air fluctuation operation does not work.
Page 30: Power-Airflow Dual Flapsfins
SiUS04-921 Main Functions Power-airflow Dual Fins  Triple airflow by the combination with wide-angle louvers UP/DOWN (AUTOMATIC) COOLING HEATING AIR PURIFYING (INDIVIDUAL OPERATION) DRY COOLING RIGHT/LEFT (AUTOMATIC) Wide-angle Fins Wider airflow eliminates uncomfortable irregular temperature distribution. Wide-angle fins, enabling wider airflow to the left and right, are implemented to provide comfortable airflow to every corner of the room.
Page 31: 3-D Airflow
Main Functions SiUS04-921  It can send the airflow to the center of the room even when the airconditioner is installed in the corner of the room. The curved fins of wide-angle louver heat the center of the room. (R5098) 3-D Airflow Alternating swing of blades in vertical and horizontal directions circulates the airflow to every corner of the room and prevents uneven temperature distribution.
Page 32: Powerful Operation
SiUS04-921 Main Functions POWERFUL Operation Operation POWERFUL (Can only be used if the unit is running.) (R10073)  Effective mode for POWERFUL COOLING • Cooling • Dry cooling  Effective mode for POWERFUL HEATING • Heating Refer to the operation manual for details. ...
Page 33: Multi-Colored Indicator Lamp
Main Functions SiUS04-921 2.11 Multi-colored Indicator Lamp Features Current operation mode is displayed in color of the lamp of the indoor unit. Operating status can be monitored even in automatic operation in accordance with the content of actual operation. Multi-colored indicator lamp (R10074) ...
Page 34: Information Display
SiUS04-921 Main Functions 2.13 Information Display Operation INFORMATION (R10076) Refer to the operation manual for details.  Room temperature, indoor humidity, and outdoor temperature are displayed. Features  Point the remote controller at the indoor unit for 2 seconds.  During operation, the outdoor temperature may sometimes be displayed higher than it Note actually is in COOLING or QUATERNITY DRYING mode or lower in HEATING mode (especially if frost has accumulated on the outdoor unit), due to the effects of the air blown...
Page 35: Mold-Proof Stick
Main Functions SiUS04-921 2.14 Mold-Proof Stick  Drain pan which prevents mold proliferation Features The drain pan of the main unit can easily acquire mold so it is equipped with a mold-proof “Stick” providing a mildew-proof, antibacterial, and antivirus effect. Mold-proof stick Drain pan (R5104)
Page 36: Flash Streamer Air Purifying Operation
The technology for the real air purifier is adopted for the air conditioner. Our original Flash Streamer system technology used for our Daikin air purifiers is incorporated. This technology far exceeds the air purifying performance of a normal air conditioner.
Page 37 Operation time (min.) The formaldehyde concentration in the laboratory (10 m /108 sq feet) at 0.5-time ventilation and the initial concentration setting of 0.3 ppm (Observed by Daikin) (Nozaki laboratory, Graduate Course of Health and Society System, Tohoku Bunka Gakuen University) (R10079)
Page 38: Wipe-Clean Flat Panel
Ammonia : Pet odor, Bathroom odor Methyl Mercaptan : Garbage odor, Rot odor Trimethylamine : Fish odor Hydrogen Sulfide : Egg odor Persist rate of odor ingredients in a box of 1m (35.3 cu feet) (Daikin result) (R10080) Ammonia Acetaldehyde Acetic Acid...
Page 39: Filter Cleaning Indicator (Remote Controller)
Main Functions SiUS04-921 2.17 Filter Cleaning Indicator (Remote Controller) After the unit operates for about 2 weeks (about 340 hours), the filter cleaning indicator alerts you that it is time for maintenance. If the filter is left dirty, the power consumption increases by about 10%. It is recommended to maintain it periodically to ensure energy-saving operation.
Page 40: Night Set Mode
SiUS04-921 Main Functions 2.18.2 COUNTDOWN OFF Timer Operation COUNTDOWN OFF timer (R10082) Refer to the operation manual for details.  The COUNTDOWN OFF timer sets the time by simple button pressing. The operation is Features stopped when the set time comes. The time can be set in the unit of 0.5 hour for maximum 9.5 hours.
Page 41: Table For Special Modes
Main Functions SiUS04-921 2.20 Table for Special Modes • Indoor unit [ON/OFF] • Transmission normal Forced operation mode • Left for 15 min. • Indoor unit [ON/OFF] 5~9 sec. Reset • Transmission abnormal Indoor unit • Indoor unit [ON/OFF] 5~9 sec. demonstration Indoor unit [ON/OFF]...
Page 42: Thermostat Control
SiUS04-921 Main Functions 2.21 Thermostat Control Outline When COOLING or In the table below you can find the thermostat ON and OFF conditions for a set point of 70°F(21°C). HEATING mode is Monitoring selected with the --> Set point 70°F(21°C) shift 0.5°C 68.0~68.9°F Cooling...
Page 43: Fan Speed Control For Indoor Units
Main Functions SiUS04-921 2.22 Fan Speed Control for Indoor Units Control mode The airflow can be automatically controlled depending on the difference between the set temperature and the room temperature. This is done through speed control and Hall IC control. Phase steps Speed control and fan speed control contains different steps: Step...
Page 44 SiUS04-921 Main Functions Heating Room Indoor heat exchanger temperature area temp.area Room temperature area Set point - room temperature °C / °F –1.5/–2.7 –1.0/–1.8 –0.5/–0.9 0.5 / 0.9 1.0 / 1.8 1.5 / 2.7 2.0 / 3.6 2.5 / 4.5 3.0 / 5.4 3.5 / 6.3 4.0 / 7.2...
Page 45: Draft Prevention (Hot-Start)
Main Functions SiUS04-921 2.23 Draft Prevention (Hot-Start) Outline Draft prevention control is carried out to prevent a cold draft feeling when the unit is started in heating operation. This also will happen if the indoor heat exchanger temperature drops. Details The outdoor unit will prevent a cold draft by monitoring the indoor heat-exchanger thermistor.
Page 46: Control Specification
SiUS04-921 Control Specification 3. Control Specification Frequency Control Outline Once the timers for the compressor start-up have elapsed, the unit will determine its compressor frequency from the following parameters; D: The difference between the room temperature and the setpoint (°C) Indoor frequency The indoor command frequency is determined by the difference between the room temperature and the temperature set by the remote controller.
Page 47: Preheating Operation (Quick Warming Function)
Control Specification SiUS04-921  ( D – D ) x 4 currently last measurement Preheating Operation (Quick Warming Function) Outline Operate the inverter in the open phase operation with the conditions including the preheating command from the discharge pipe temperature. Details ON condition The preheating operation starts when the discharge pipe temperature drops.
Page 48: Compressor Start-Up Protection
SiUS04-921 Control Specification The four-way valve compensation function is engaged in four cases  When starting the compressor for heating.  When the operation mode is changed.  When starting the compressor for defrosting.  When starting the compressor after a power failure (auto-restart). No power to the valve -->...
Page 49: Fan Speed Control For Outdoor Unit
Control Specification SiUS04-921 Fan Speed Control for Outdoor Unit Outline The fan speed control regulates the speed of the outdoor fan. Details Fan control is carried out according to the following conditions. 1. Fan ON control for electric component cooling fan 2.
Page 50: Fin Thermistor Control
SiUS04-921 Control Specification Fin Thermistor Control Outline When the fin temperature rises, the fan rotation speed will increase to protect the electrical parts. This function is only applicable for inverters. The temperature sensor is located on the top of the radiation fins connected to the power elements of the electronic inverter circuit (PAM &...
Page 51: Peak-Cut Control
Control Specification SiUS04-921 I3–I3 8.75 Return area:  Limiting control for the maximum frequency is cancelled. Steady area:  The maximum frequency remains constant. Step down area:  The maximum frequency in this control is defined as (operation frequency – 2 Hz). ...
Page 52: Indoor Heat Exchanger Freeze-Up Protection
SiUS04-921 Control Specification Stop area:  The compressor, indoor fan, and outdoor fan will stop. Indoor Heat Exchanger Freeze-up Protection Outline During cooling or dry operation, a malfunction of the unit may cause the indoor heat exchanger's temperature to drop excessively. To prevent the indoor heat exchanger from freezing up, the freeze protection function will reduce the compressor's maximum operation frequency.
Page 53: Dew Prevention
Control Specification SiUS04-921 3.10 Dew Prevention Outline Cooling the air around us means that the air is dehumidified (condensation of water on the coil). But because the air is cooled down, less water can be absorbed by the air and as a consequence the relative humidity of the air rises.
Page 54: Liquid Compression Protection 2
SiUS04-921 Control Specification 3.11 Liquid Compression Protection 2 Outline The function will ensure a pressure differential between the high pressure and the low pressure. This is required when cooling with low outdoor air temperature because HP gets weak and you will have small capacity and a high power input.
Page 55: Automatic Defrosting
Control Specification SiUS04-921 Correction value by outdoor temperature (c) Outdoor temperature Correction value (c) = 0°C (1.8°F) – 9°C (15.8°F) –10°C(14°F) Correction value (c) = 7°C (12.6°F) (R10102) Return area:  Limiting control for the maximum frequency is cancelled. Up area: ...
Page 56: Electronic Expansion Valve Control
SiUS04-921 Control Specification Operation during Defrosting and Termination Condition • Operation should be conducted at 64Hz during defrosting. • Defrosting operation must be conducted for 2 minutes, and after that, defrosting operation is conducted until the outdoor heat exchanger temperature reaches the defrost cancellation temperature at ºC.
Page 57: Power Initialization Control
Control Specification SiUS04-921 Details The gray squares indicate which secondary functions are active or can be activated. Operation pattern Main operation control Power ON Power initialization control — —  Cooling 1 room Control when starting — operation Control of target discharge ...
Page 58 SiUS04-921 Control Specification Ending Condition After 6 minutes from the time compressor starts. Discharge temperature(°C) + 6 > condensation temperature (°C) > (36°C) (96.8°F) : A constant depending on the outdoor unit type evopf : A constant depending on the outdoor unit type : A constant depending on the outdoor unit type evopdce : A constant depending on the outdoor unit type...
Page 59 SH and the discharge temperature (see the following figure show the target discharge temperature), a control on the discharge temperature was made to be one of the main control systems of Daikin Target Discharge Pipe Temperature Control airconditioners.
Page 60: Pressure Equalization Control
SiUS04-921 Control Specification 3.14.5 Pressure Equalization Control Outline The pressure difference between both sides of the expansion valve works as an extra load when restarting the compressor. To limit the load on the compressor when restarting it and consequently limit the starting current, a pressure-equalization is performed after deactivating the compressor. Pressure equalization is achieved by opening the expansion valve to a certain level and then closing it again.
Page 61 Control Specification SiUS04-921 3.14.6 Control for Abnormally High Discharge Temperature Outline An abnormally high discharge temperature is an indication for a too high suction temperature or super-heat. Making adjustments to the expansion valve opening can solve this problem. Details Increasing the expansion valve opening will increase the refrigerant flow through the evaporator and decrease the superheat and the discharge temperature.
Page 62: System Configuration
SiUS04-921 Part 5 System Configuration 1. Installation Manual ................54 1.1 Indoor Units ....................54 1.2 Outdoor Units ..................64 2. System Configuration................70 3. Instruction....................71 3.1 Remote Controller ..................71 3.2 Cooling · QUATERNITY DRYING Operation .........73 3.3 Heating Operation ..................74 3.4 AUTO Operation..................75 3.5 FLASH STREAMER AIR PURIFYING ·...
Page 63: Installation Manual
Installation Manual SiUS04-921 1. Installation Manual Indoor Units Indoor Unit Installation Drawings Removing and installing indoor unit. • Installation method 1) Using the marks (3 locations) on top of the indoor unit, attach the mounting plate hooks Mounting Mounting onto the indoor unit. plate plate 2) Attach the tabs on the bottom frame onto the...
Page 64: Installation Tips
SiUS04-921 Installation Manual Installation Tips Removing and installing front panel. Rotating shaft Rotating shaft • Removal method 1) Open the front panel. 2) Spread out the shaft hole on the left side and remove the rotating shaft. Spread out the shaft hole on the right side as well Shaft hole Shaft hole and remove the rotating shaft.
Page 65: Drain Hose
Installation Manual SiUS04-921 Installing the titanium apatite photocatalytic air-purifying filter and deodorizing filter for streamer. 1) Open the front panel to pull out the air filter. 2) Attach the titanium apatite photocatalytic air- Left side Right side purifying filter. Titanium apatite Deodorizing filter 3) Attach the deodorizing filter for streamer.
Page 66: Indoor Unit Installation
SiUS04-921 Installation Manual Indoor Unit Installation Installing the mounting plate. • The mounting plate should be installed on a wall which can support the weight of the indoor unit. 1) Temporarily secure the mounting plate to the wall, make sure that the panel is completely level, and mark the fixing points on the wall.
Page 67 Installation Manual SiUS04-921 Laying piping and wiring. • Lay the piping and drain hose according to the Piping bundle diagram orientation of the piping coming out of the unit, as shown below. Inter-unit wiring • Make sure the drain hose is sloped downward. Gas pipe •...
Page 68: Wall Embedded Piping
SiUS04-921 Installation Manual Indoor Unit Installation 4-4. Wall embedded piping. Inner wall Follow the instructions given under Insert drain hose to this depth so Left-side, left-back, or left-bottom piping it won’t be pulled out of drain pipe. 1) Insert the drain hose to this depth so it won’t be 1-15/16 inch Drain hose (50mm)
Page 69 Installation Manual SiUS04-921 Connecting to the HA system. 1) Remove the front grille. (3 screws) Fig. 1 Location of the tabs 2) Remove the decelerator assembly parts. on the electric parts box (1 screw) Anti-drip cover fixing screw 2-1) Remove the decelerator assembly part screws.
Page 70: Drain Piping
SiUS04-921 Installation Manual Indoor Unit Installation Drain piping. The drain hose should be inclined downward. 1) Connect the drain hose, as described right. No trap is permitted. Do not put the end of the hose in water. 2) Remove the air filters and pour some water into the drain pan to check the water flows smoothly.
Page 71: Refrigerant Piping Work
Installation Manual SiUS04-921 Refrigerant Piping Work Flaring the pipe end. (Cut exactly at 1) Cut the pipe end with a pipe cutter. right angles.) Remove burrs 2) Remove burrs with the cut surface facing downward Flaring Set exactly at the position shown below. so that the chips do not enter the pipe.
Page 72 SiUS04-921 Installation Manual Trial Operation and Testing Trial operation and testing. 1-1. Measure the supply voltage and make sure that it falls in the specified range. 1-2. Trial operation should be carried out in either cooling or heating mode. • In cooling mode, select the lowest programmable temperature; in heating mode, select the highest programmable temperature.
Page 73: Outdoor Units
Installation Manual SiUS04-921 Outdoor Units Outdoor Unit Installation Drawings Wrap the insulation pipe with the finishing tape from bottom to top. Max. allowable length 32ft (10m) Max. allowable height 26ft (8m) Gas pipe O.D. 3/8 inch (9.5mm) Liquid pipe O.D. 1/4 inch (6.4mm) No refrigerant needs to be added if the piping does not exceed the maximum length.
Page 74: Installing Outdoor Unit
SiUS04-921 Installation Manual Outdoor Unit Installation (1) Installing outdoor unit. 1) When installing the outdoor unit, refer to “Precautions for Selecting the Location” and the “Outdoor Unit Installation Drawings”. 2) If drain work is necessary, follow the procedures below. Drain work (heat pump-models). 1) Use drain plug for drainage.
Page 75: Outdoor Unit Installation
Installation Manual SiUS04-921 Outdoor Unit Installation (2) Purging air and checking gas leakage. • When piping work is completed, it is necessary to purge the air and check for gas leakage. WARNING 1) Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration cycle. 2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
Page 76: Pump Down Operation
SiUS04-921 Installation Manual Outdoor Unit Installation (3) Refilling the refrigerant. Check the type of refrigerant to be used on the machine nameplate. Filling a cylinder with an Filling other cylinders Precautions when adding R410A attached siphon Fill from the liquid pipe in liquid form. Stand the cylinder upright Turn the cylinder when filling.
Page 77 Installation Manual SiUS04-921 Wiring (1) WARNING 1) Do not use spliced wires, stranded wires, extension cords, or starburst connections, as they may cause overheating, electrical shock, or fire. Follow all Local, and State electrical codes. 2) Do not use locally purchased electrical parts inside the product. (Do not overload the circuit by adding drain pump or other electrical equipment to unit terminals.) Doing so may cause electric shock or fire.
Page 78: Test Run And Final Check
SiUS04-921 Installation Manual Wiring (2) CAUTION (1) In case using stranded wires is unavoidable for some reason, Round make sure to install the round crimp-style terminals on the tip. crimp-style terminal Stranded Place the round crimp-style terminals on the wires up to the wire covered part and secure in place.
Page 79: System Configuration
System Configuration SiUS04-921 System Configuration After the installation and test operation of the room air conditioner have been completed, it should be operated and handled as described below. Every user would like to know the correct method of operation of the room air conditioner, to check if it is capable of cooling (or heating) well, and to know the most beneficial method of using it.
Page 80: Instruction
SiUS04-921 Instruction 3. Instruction Remote Controller (7 m) QUATERNITY DRYING button System Configuration...
Page 81 Instruction SiUS04-921 System Configuration...
Page 82: Cooling · Quaternity Drying Operation
SiUS04-921 Instruction Cooling · QUATERNITY DRYING Operation QUATERNITY QUATERNITY -3°C (-5°F) - STD 18°C - 32°C (64°F - 90°F) QUATERNITY DRYING OPERATION to QUATERNITY DRYING may raise humidity temporarily. System Configuration...
Page 83: Heating Operation
Instruction SiUS04-921 Heating Operation 10°C - 30°C (50°F - 86°F) System Configuration...
Page 84: Auto Operation
SiUS04-921 Instruction AUTO Operation 18°C - 30°C (64°F - 86°F) System Configuration...
Page 85: Flash Streamer Air Purifying · Powerful Operation
Instruction SiUS04-921 FLASH STREAMER AIR PURIFYING · POWERFUL Operation POWERFUL COOLING: POWERFUL HEATING: System Configuration...
Page 86: Adjusting Airflow Direction · Airflow Rate
SiUS04-921 Instruction Adjusting Airflow Direction · Airflow Rate QUATERNITY DRYING QUATERNITY DRYING, or DRY COOLING operation, the FLASH STREAMER AIR PURIFYING Individual operation QUATERNITY DRYING - COOLING HEATING System Configuration...
Page 87: Comfort Airflow · Cooling Breeze Operation
Instruction SiUS04-921 COMFORT AIRFLOW · COOLING BREEZE Operation QUATERNITY DRYING and FLASH STREAMER QUATERNITY DRYING System Configuration...
Page 88: Timer Operation
SiUS04-921 Instruction TIMER Operation 0.5°C (1°F) during COOLING or DRY COOLING and turns down 2°C 2°C (3.6°F) during heating. System Configuration...
Page 89: Comfort Sleep Operation
Instruction SiUS04-921 COMFORT SLEEP Operation wake up. 26 - 29°C (79 - 84°F) 20 - 25°C (68 - 77°F) 2°C (3.6°F) 1°C (1.8°F) System Configuration...
Page 90: Set Up · Child Proof Lock
SiUS04-921 Instruction 3.10 SET UP · CHILD PROOF LOCK System Configuration...
Page 91: Information Display
Instruction SiUS04-921 3.11 INFORMATION DISPLAY QUATERNITY DRYING mode or -9°C (16°F). 37°C (99°F). 3P226009-1 System Configuration...
Page 92: Service Diagnosis
SiUS04-921 Part 6 Service Diagnosis 1. Convenient Service Check Function .............85 2. Troubleshooting ..................87 2.1 Error Code Indication by Remote Controller ..........87 2.2 Air conditioner does not run..............88 2.3 Air conditioner runs but does not cool or heat........91 2.4 When operation starts, safety breaker trips..........93 2.5 Air conditioner makes a loud sound and vibrates........95 2.6 Indoor Unit PCB Abnormality ..............96 2.7 Peak-cut Control or Freeze-up Protection..........97...
Page 93 SiUS04-921 3.4 Power Supply Waveform Check............143 3.5 Main Circuit Electrolytic Capacitor Check ..........143 3.6 Refrigerant System Check ..............144 3.7 “Inverter Checker” Check ..............145 3.8 Power Transistor Check ...............146 3.9 Discharge Pressure Check..............147 3.10 Electronic Expansion Valve Check............148 3.11 Indoor Unit PCB Output Check ............149 3.12 Rotating Pulse Input on Outdoor Unit PCB Check .......150 3.13 Humidity Sensor Check................151 3.14 Main Circuit Short Check..............151...
Page 94: Convenient Service Check Function
SiUS04-921 Convenient Service Check Function 1. Convenient Service Check Function  Failure diagnosis with operation lamp The operation lamp on the display of the indoor unit flashes when any of the following failures are detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions and the system does not work.
Page 95 Convenient Service Check Function SiUS04-921  Failure diagnosis by LED indication The following failure diagnosis can be done by LED indication on the outdoor unit PCB. 1. The outdoor unit has 2 green LED(LED A, LED5) on the PCB. Refer to page The flashing green LED indicates "in order"...
Page 96: Troubleshooting
SiUS04-921 Troubleshooting 2. Troubleshooting Error Code Indication by Remote Controller * Various cases may be possible. Code Unit Description Reference page Air conditioner does not run. Air conditioner runs but does not get cooling (heating). Basic Failure Diagnosis When operation starts, safety breaker trips. Air conditioner makes a loud noise and vibrates.
Page 97: Air Conditioner Does Not Run
Troubleshooting SiUS04-921 Air conditioner does not run. Method of Malfunction Detection Malfunction Decision Conditions  Power supply is OFF Supposed  Improper power supply voltage Causes  Improper connection of wire  Incorrect combination of indoor unit and outdoor unit ...
Page 98 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Is the power supply plug inserted into the Insert the power supply outlet or the breaker for plug into the outlet.
Page 99 Troubleshooting SiUS04-921 Continued from the previous page Operation lamp flashes? Is an error code Diagnose by an error code Go to troubleshooting. displayed on the remote controller? Does it operate Replace the outdoor unit on test operation PCB. mode? Diagnose the indoor unit and the Go to LED diagnosis.
Page 100: Air Conditioner Runs But Does Not Cool Or Heat
SiUS04-921 Troubleshooting Air conditioner runs but does not cool or heat Method of Malfunction Detection Malfunction Decision Conditions  Incorrect temperature setting Supposed  Incorrect combination of indoor unit and outdoor unit Causes  Blocked air filter  Insufficient power ...
Page 101 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.02 Refer to P.141 Is the set Set the temperature Thermostat off temperature correct? properly. Is there the required installation space? (It isn’t Secure required space.
Page 102: When Operation Starts, Safety Breaker Trips
SiUS04-921 Troubleshooting When operation starts, safety breaker trips Method of Malfunction Detection Malfunction Decision Conditions  Insufficient capacity of safety breaker Supposed  Ground leakage breaker is too sensitive Causes  Not exclusive circuit  The supply voltage is not within rated voltage ±10%. ...
Page 103 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. [Power supply] Check No.29 Refer to P.151 Is the capacity of safety breaker as Replace the safety breaker specified? to a specified one.
Page 104: Air Conditioner Makes A Loud Sound And Vibrates
SiUS04-921 Troubleshooting Air conditioner makes a loud sound and vibrates. Method of Malfunction Detection Malfunction Decision Conditions  Piping length is too short Supposed  Mounting wall is too thin Causes  Insufficient vibration prevention measures  Deformation of the unit ...
Page 105: Indoor Unit Pcb Abnormality
Troubleshooting SiUS04-921 Indoor Unit PCB Abnormality Remote Controller Display Method of Check zero-cross detection from the power supply of the indoor unit Malfunction Detection Malfunction When no zero-cross detection is performed in approximately 10 continuous seconds Decision Conditions  Defective indoor unit PCB (Faulty EEPROM data) Supposed ...
Page 106: Peak-Cut Control Or Freeze-Up Protection
SiUS04-921 Troubleshooting Peak-cut Control or Freeze-up Protection Remote Controller Display  Peak-cut control (high pressure control) Method of Malfunction During heating operation, the temperature detected by the indoor heat exchanger thermistor is used for the high pressure control (stop, outdoor fan stop, etc.). Detection ...
Page 107 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.02 Check air passages Refer to P.141 Is there any short-circuit? Reserve the space for the air passages.
Page 108: Fan Motor System (Dc Motor) Abnormality
SiUS04-921 Troubleshooting Fan Motor System (DC Motor) Abnormality Remote Controller Display Method of The fan speed detected by the Hall IC during operation of high-pressure fan motor is used to Malfunction determine abnormal fan operation. Detection Malfunction When the detected fan speed is less than 50% of the HH tap under the maximum fan motor rpm demanded.
Page 109 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. I Caution Turn off the power supply Check No.18 If the connector is (Turn off the breaker). disconnected while the Refer to P.149 power is ON, the motor will...
Page 110: Streamer Unit Abnormality
SiUS04-921 Troubleshooting Streamer Unit Abnormality Remote Controller Display Method of Malfunction Detection  If the error repeats 3 times in air purifying operation. Malfunction  Clearing condition: Continuous run for about 2 minutes (normal). Decision Conditions  Short circuit caused by the dust or water on the streamer unit electrode part. Supposed ...
Page 111 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Dust or drip of water is Clean the streamer unit. on the streamer unit. Does the multi-monitor LED blink about 1 minute Clean the streamer unit.
Page 112: Thermistor System Abnormality
SiUS04-921 Troubleshooting 2.10 Thermistor System Abnormality C4, C9 Remote Controller Display Method of Thermistor fault is detected based on the temperature determined by each thermistor Malfunction Detection Malfunction When power is supplied and the input of thermistor is 4.96 V or more or 0.04 V or less * (for reference) Decision In case of 120...
Page 113: Front Panel Open / Close Abnormality
Troubleshooting SiUS04-921 2.11 Front Panel Open / Close Abnormality Remote Controller Display Method of Malfunction Detection  The system will be shut down when the error occurs twice. Malfunction Decision Conditions  Malfunction of the reduction motor Supposed  Malfunction or deterioration of the front panel mechanism Causes ...
Page 114: Humidity Sensor Abnormality
SiUS04-921 Troubleshooting 2.12 Humidity Sensor Abnormality Remote Controller Display Method of Sensor fault is detected by input value. Malfunction Detection Malfunction When the input from a temperature sensor is 4.96 V or more or 0.04 V or less* Decision Conditions ...
Page 115: Signal Transmission Error (Indoor Unit - Outdoor Unit)
Troubleshooting SiUS04-921 2.13 Signal Transmission Error (Indoor Unit - Outdoor Unit) Remote Controller Display Method of The data sent from the outdoor unit is checked for problem. Malfunction Detection Malfunction When the data sent from the outdoor unit can not be received without error, or when the disabled status of signal transmission continues for 15 seconds and the same status continuously repeats 3 Decision times.
Page 116 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check the relay wire between the indoor unit and the outdoor unit for color and number. Is there any improper Correct the relay wire wiring? * For the machine with...
Page 117: Incompatible Power Supply Between Indoor Unit And Outdoor Unit
Troubleshooting SiUS04-921 2.14 Incompatible Power Supply between Indoor Unit and Outdoor Unit Remote Controller Display Method of Check the incompatible power supply between the indoor unit and the outdoor unit by using signal Malfunction transmission. Detection Method of In case that the incorrect indoor model is connected to the incorrect outdoor model. Malfunction Detection ...
Page 118: Outdoor Unit Pcb Abnormality
SiUS04-921 Troubleshooting 2.15 Outdoor Unit PCB Abnormality Remote Controller Display Outdoor Unit LED Display  Detect within the program of the microcomputer if the program is in good running order. Method of  Detect input of zero-cross signal. Malfunction Detection ...
Page 119: Ol Activation (Compressor Overload)
Troubleshooting SiUS04-921 2.16 OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection  If the compressor OL is activated twice, the system will be shut down. Malfunction  The error counter will reset itself if this or any other error does not occur during the following Decision 60-minute compressor running time (total time).
Page 120: Compressor Lock
SiUS04-921 Troubleshooting 2.17 Compressor Lock Remote Controller Display Outdoor Unit LED 5 5 ( - ) Display Method of Judging from current waveform generated when high-frequency voltage is applied to the Malfunction compressor. Detection  The machine is shut down when the fault count reaches 16. Malfunction ...
Page 121: Dc Fan Lock
Troubleshooting SiUS04-921 2.18 DC Fan Lock Remote Controller Display Outdoor Unit LED 5 5 ( - ) Display Method of Identify the fan motor system fault based on the fan speed detected by Hall IC while the high Malfunction pressure fan motor is running. Detection ...
Page 122: Input Overcurrent Detection
SiUS04-921 Troubleshooting 2.19 Input Overcurrent Detection Remote Controller Display Outdoor Unit LED 5 5 ( - ) Display Method of Detect an input overcurrent by checking the inverter power consumption or the input current Malfunction detected by CT with the compressor running. Detection ...
Page 123 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. *Input overcurrent may be caused by improper wiring inside the machine. If the Check No.03 machine stops due to input overcurrent after connecting or disconnecting wires to replaced part, check wiring for proper connection.
Page 124: Four-Way Valve Abnormality
SiUS04-921 Troubleshooting 2.20 Four-Way Valve Abnormality Remote Controller Display Outdoor Unit LED 5 5 ( - ) Display Method of The room temperature thermistor, the indoor heat exchanger thermistor, the outdoor air thermistor, Malfunction and the outdoor heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.
Page 125 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check No.02 Does the coil of four Refer to P.141 Rectify it. way valve get out of place (loosen)? Check No.12 Is the harness...
Page 126: Discharge Pipe Temperature Control
SiUS04-921 Troubleshooting 2.21 Discharge Pipe Temperature Control Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Discharge pipe temperature control (stop, frequency attenuation, etc.) is executed based on the Malfunction temperature detected by the discharge pipe thermistor. Detection ...
Page 127: High Pressure Control In Cooling
Troubleshooting SiUS04-921 2.22 High Pressure Control in Cooling Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of During cooling, high pressure control (stop, frequency attenuation, etc.) is executed according to Malfunction the temperature detected by the heat exchanger thermistor. Detection Malfunction During cooling, when the temperature detected by the heat exchanger thermistor is 63°C(145.4°F)
Page 128: Part
SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check installation space Check No.02 Refer to P.141 Check No. 03 Change the position of air Installation condition check discharge grille.
Page 129: Compressor Sensor System Abnormality
Troubleshooting SiUS04-921 2.23 Compressor Sensor System Abnormality Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Fault condition is identified by DC current which is detected before compressor startup. Malfunction Detection  When the DC current before compressor startup is other than 0.5 to 4.5 V (detected by Malfunction Decision converting the sensor output to voltage), or the DC voltage is 50 V or less.
Page 130: Position Sensor Abnormality
SiUS04-921 Troubleshooting 2.24 Position Sensor Abnormality Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Startup failure of the compressor is identified by rpm information of the compressor and by the Malfunction electric component position detector. Detection ...
Page 131 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check the power supply Check No.14 Refer to P.145 Check No. 16 Discharge pressure check Check No.16 Refer to P.147 Judge Replace stop valve.
Page 132: Dc Voltage / Dc Current Sensor Abnormality
SiUS04-921 Troubleshooting 2.25 DC Voltage / DC Current Sensor Abnormality Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of DC voltage or DC current sensor system fault is identified based on the compressor operation Malfunction frequency and the input current detected by the product of DC current and DC voltage. Detection Malfunction When the compressor operation frequency is more than 62 Hz...
Page 133: Thermistor System Abnormality
Troubleshooting SiUS04-921 2.26 Thermistor System Abnormality P4, J3, J6, H9 Remote Controller Display Outdoor Unit LED 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 detected by each thermistor. Detection Malfunction When power is supplied and the thermistor input is 4.98 V or more...
Page 134 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Turn on the power supply again Check No.02 Refer to P.141 Does the remote controller display Reconnect properly. the error code again? Check No.02...
Page 135: Abnormal Temperature In Electrical Box
Troubleshooting SiUS04-921 2.27 Abnormal Temperature in Electrical Box Remote Controller Display Outdoor Unit LED Display Method of Temperature rise in the electrical box is identified based on the temperature of the radiation fin Malfunction detected by the fin thermistor with the compressor off. Detection Malfunction When the temperature of the radiation fin is 122°C(251.6°F) or more during the compressor off.
Page 136 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. (Note on resetting power supply) To reset the machine, power off status Check No.02 need to continue at least 30 sec. Refer to P.141 WARNING Turn off the power and turn it on...
Page 137: Temperature Rise In Radiation Fin
Troubleshooting SiUS04-921 2.28 Temperature Rise in Radiation Fin Remote Controller Display Outdoor Unit LED Display Method of Temperature rise in the radiation fin is identified based on the temperature of the radiation fin Malfunction detected by the fin thermistor with the compressor on. Detection ...
Page 138 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Be sure to turn off power switch before connect or disconnect connector, Caution the connector, or parts damage may occur. or parts damage may be occurred. WARNING Turn off the power supply and turn it on again to get the system...
Page 139: Output Overcurrent
Troubleshooting SiUS04-921 2.29 Output Overcurrent Remote Controller Display Outdoor Unit LED Display Method of An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Detection  A position signal error occurs while the compressor is running. Malfunction ...
Page 140 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting the connector, or parts damage may occur. Caution *Output overcurrent may caused by improper wiring inside the machine. If the machine stops due to output overcurrent after connecting or disconnecting wires to replace part, check wiring for proper connection.
Page 141: Insufficient Gas
Troubleshooting SiUS04-921 2.30 Insufficient Gas Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Gas shortage detection I: Malfunction Gas shortage is detected by checking the input current value and the compressor running frequency. If the gas is short, the input current is smaller than the normal value. Detection Gas shortage detection III: Gas shortage is detected by checking the difference between ambient temperature and heat...
Page 142 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting the connector, or parts damage may occur. Caution Check No.02 Is the stop Open the stop valve. valve opened? Refer to P.141 Check gas leakage. Check No.17 Refer to P.148 Oil oozing at field pipe...
Page 143: Over Voltage Protection / Low Voltage Protection
Troubleshooting SiUS04-921 2.31 Over Voltage Protection / Low Voltage Protection Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Detect an abnormal increase or drop of voltage by the detection circuit or DC voltage detection Malfunction circuit.
Page 144: Outdoor Unit Pcb Abnormality Or Communication Circuit Abnormality135
SiUS04-921 Troubleshooting 2.32 Outdoor Unit PCB Abnormality or Communication Circuit Abnormality Remote Controller Display Outdoor Unit LED Display Method of Detect within the program of the microcomputer whether or not the program is in good running Malfunction order. Detection Malfunction 1.
Page 145 Troubleshooting SiUS04-921 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check indoor unit also, because a communication circuit fault may be caused by the problem related to the indoor unit. Check supply voltage Rated voltage? Rectify the power supply.
Page 146 SiUS04-921 Troubleshooting Continued from the previous page Check No.08 Refer to P.143 Does LED A turn off? Check grounding Grounded? Carry out grounding work. The cause seems to be an external factor other than Check No.08 failure of the outdoor unit Power supply waveform check PCB.
Page 147: Signal Transmission Error On Outdoor Unit Pcb
Troubleshooting SiUS04-921 2.33 Signal Transmission Error on Outdoor Unit PCB Remote Controller Display Outdoor Unit LED 55 ( - ) Display Method of Communication error between microcomputer mounted on the main body and inverter. Malfunction Detection  When the data sent from the microcomputer of the inverter can not be received 15 times Malfunction Decision successively or for 15 sec, the machine shuts down.
Page 148 SiUS04-921 Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts damage may occur. Check blinking interval of LED 5 YES (0.5 sec. interval) Is it 0.5 sec.? (same as LED A) (0.2 sec.
Page 149: Lights-Out Of Microcomputer Status Lamp
Troubleshooting SiUS04-921 2.34 Lights-out of Microcomputer Status Lamp Remote — Controller Display Outdoor Unit LED 51 ( - ) Display Method of When a microcomputer fault is detected, LED A or LED 5 turns off. Malfunction Detection Malfunction Decision Conditions ...
Page 150: Check
SiUS04-921 Check 3. Check Thermistor Resistance Check Check No.02 Remove the connectors of the thermistors on 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.
Page 151: Installation Condition Check
Check SiUS04-921 Installation Condition Check Check No.03 Installation condition check Check the allowable Abnormal dimensions of the air Change the position of the air suction and discharge discharge grille or the area. installation location. Normal Does the discharged air from other outdoor unit Change the position of the air cause an increase...
Page 152: Power Supply Waveform Check
SiUS04-921 Check Power Supply Waveform Check Check No.08 Check the voltage waveform between power supply terminals on the terminal board for disturbance using oscillo-tester.  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] Main Circuit Electrolytic Capacitor Check...
Page 153: Refrigerant System Check
Check SiUS04-921 Refrigerant System Check Check No.12 Refrigerant system check Models with discharge pipe thermistor (blockage, gas leakage, insufficient gas are to be checked) Is the discharge pipe Rectify. thermistor disconnected from the holder? Is the temperature of Replace the four-way valve. suction pipe of four-way valve extremely high? Gas leakage check...
Page 154: Inverter Checker" Check
SiUS04-921 Check “Inverter Checker” Check Check No.14 1. Characteristics If abnormal stop occurs due to compressor startup failure or overcurrent output when using inverter unit, it is difficult to judge it results from the compressor failure or other failure (control PCB, power transistor, etc.).
Page 155: Power Transistor Check
Check SiUS04-921 3. Diagnose method (Diagnose can be made according to 6 LEDs lighting status as follows:) (1) When all LEDs are lit uniformly, Compressor malfunction (to be replaced) (2) When some of LEDs are not lit (LEDs are not lit or go off, etc.): Check the individual power transistor.
Page 156: Discharge Pressure Check
SiUS04-921 Check Discharge Pressure Check Check No.16 Discharge pressure check Is it high? Replace the compressor. Is the stop valve open? Open the stop valve. Is the connection pipe Replace the field piping. deformed? Are the heat exchanger Clean it. and air filter dirty? Replace the compressor.
Page 157: Electronic Expansion Valve Check
Check SiUS04-921 3.10 Electronic Expansion Valve Check Check No.17 Check the electronic expansion valve (EV) as follows: 1. Check if the EV connector is properly inserted into the control PCB. Collate the number of EVs in the main body with those of the connector. 2.
Page 158: Indoor Unit Pcb Output Check
SiUS04-921 Check 3.11 Indoor Unit PCB Output Check Check No.18 <Control PCB (A1P)> 1. Check for proper connection. 2. Check supply voltage applied to the motor output (between No. 4 pin and No. 7 pin. 3. Check motor control voltage output (between No. 3 pin and No. 4 pin). Check rpm command voltage output (between No.
Page 159: Rotating Pulse Input On Outdoor Unit Pcb Check
Check SiUS04-921 3.12 Rotating Pulse Input on Outdoor Unit PCB Check Check No.23 < For propeller fan motor> Make sure voltage of 270 ± 30 V is applied. 1. Set power ON and operation OFF. Remove connector S70. 2. Check that the voltage between No. 4 pin and No.7 pin is 270 VDC. 3.
Page 160: Humidity Sensor Check
SiUS04-921 Check 3.13 Humidity Sensor Check Check No.27 1. Check for proper connection. 2. Check sensor input level (*1). 3. Change ambient conditions (*2) and check that input level changes accordingly. *1 Input level varies depending on the sensor. *2 Changes in humidity, temperature, airflow rate. To do this, merely breatheon the sensor. <Humidity sensor>...
Page 161: Four-Way Valve Performance Check
Check SiUS04-921 3.15 Four-Way Valve Performance Check Check No.31 < Caution on resetting the power supply > * Be sure to wait for 30 sec. or more after turning off the power supply. Turn off the power and turn it on again.
Page 162: Solenoid Valve For Dehumidification Check
SiUS04-921 Check 3.16 Solenoid Valve for Dehumidification Check Check No.32 Faulty criterion: In dehumidification test operation mode, PCB is identified as a faulty when the solenoid valve does not turn on within 2 seconds after compressor start-up. (When reheating dehumidifying is not used, the operation mode is similar to cooling operation.) Stop operation Run dehumidification test...
Page 163 Check SiUS04-921 Service Diagnosis...
Page 164: Removal Procedure
SiUS04-921 Part 7 Removal Procedure 1. Indoor Unit...................156 1.1 Removal of Air Filters / Front panel............156 1.2 Removal of Upper Panel ..............163 1.3 Removal of Front Grille ................166 1.4 Removal of Assembly of Open/Close Mechanism .......169 1.5 Removal of Assembly of Reduction Motor ...........171 1.6 Removal of Electrical Box ..............174 1.7 Removal of PCB...................179 1.8 Removal of Dehumidifying Solenoid Valve Coil ........185...
Page 165: Indoor Unit
Indoor Unit SiUS04-921 1. Indoor Unit Removal of Air Filters / Front panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points  Multi-colored indicator lamp 1. External appearance changes its color according to the operation mode.
Page 166 SiUS04-921 Indoor Unit Step Procedure Points (R10134) Keep the front panel open with the support plate. Push the center part of the air filter up to undo the 2 hooks. Hooks (R10135) Remove the air filter toward yourself. (R10136) Removal Procedure...
Page 167 Indoor Unit SiUS04-921 Step Procedure Points The shapes of the right and left filters are different.  Insert the filters along with the guide for easy installation. (R10137) 3. Remove the deodorizing filter for streamer Pull the center knob to undo the hook.
Page 168 SiUS04-921 Indoor Unit Step Procedure Points  In cleaning, keep the filter with Undo the 3 hooks on the longitudinal direction. the frame to prevent breaking it.. Slide the filter toward yourself to remove. 4. Removal of the streamer unit Pull down the streamer unit with holding the knob.
Page 169 Indoor Unit SiUS04-921 Step Procedure Points 5. Removal of the titanium apatite photocatalytic air- purifying filter Undo the projection of the frame of titanium apatite photocatalytic air-purifying filter and remove it.  Insert the filters along with the guide for easy installation. (R0070) Undo the 4 hooks, open the frame, and remove...
Page 170 SiUS04-921 Indoor Unit Step Procedure Points 6. Removal of the front panel Open the front panel further than the stopping position. (R10139) Push the panel stoppers outward on both right and left sides to detach the rotary shafts from the holes.
Page 171 Indoor Unit SiUS04-921 Step Procedure Points Slide the rotary shaft on the right to the left and pull it out toward yourself. Remove the front panel. (R10140) Removal Procedure...
Page 172: Removal Of Upper Panel
SiUS04-921 Indoor Unit Removal of Upper Panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the service cover Remove the 1 screw (black) of the service cover.
Page 173 Indoor Unit SiUS04-921 Step Procedure Points 2. Removal of the upper panel Release the 3 hooks of the upper panel. (R10142) In part A, pinch the upper hook, release the hook, and lift it up. (R10143) In part B, release the hook as in part A, and lift it up.
Page 174 SiUS04-921 Indoor Unit Step Procedure Points In part C, lift the right and left sides to bend the upper panel and slightly pull toward yourself to remove. (R10144)  When assembling, make sure Pull the upper panel toward yourself to to catch the far side hooks.
Page 175: Removal Of Front Grille
Indoor Unit SiUS04-921 Removal of Front Grille Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the front grille Remove the 3 screws and undo the upper 3 hooks of the front grille.
Page 176 SiUS04-921 Indoor Unit Step Procedure Points Slide the front grille toward yourself to remove. 2. How to install the front grille Points on installing  When assembling, make sure When assembling the that the horizontal blade front grille, fit the 4 lower (large) does not come inside.
Page 177 Indoor Unit SiUS04-921 Step Procedure Points  The gear case is fixed to the Check that the arm in the gear case of the front front grille. grille is in the stored When assembling the front position. grille, make sure the arm is stored.
Page 178: Removal Of Assembly Of Open/Close Mechanism
SiUS04-921 Indoor Unit Removal of Assembly of Open/Close Mechanism Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the open/close Preparation  Remove the front grille mechanism (right) according to "Removal of the Remove the 1 screw of...
Page 179 Indoor Unit SiUS04-921 Step Procedure Points 2. Removal of the open/close mechanism (left) Pull out the shaft from the open/close mechanism (left).  Service part is obtained as an Remove the 2 screws of the open/close assembly kit. mechanism (left). Remove the open/close mechanism (left).
Page 180: Removal Of Assembly Of Reduction Motor
SiUS04-921 Indoor Unit Removal of Assembly of Reduction Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the assembly of the reduction motor Disconnect the connector for reduction motor [S91] (S51).
Page 181 Indoor Unit SiUS04-921 Step Procedure Points Cut the clamp. Slide the cover to the right to undo the hook. Lift the cover of the gear case of the reduction motor up slightly to undo the upper hook, and remove it. Removal Procedure...
Page 182 SiUS04-921 Indoor Unit Step Procedure Points Pull the gear out to remove. Remove the 1 screw of the reduction motor. Turn the assembly over and detach the sealing tape of the reduction motor.  The connector of the Release the 2 hooks of the limit switch.
Page 183: Removal Of Electrical Box
Indoor Unit SiUS04-921 Removal of Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Disconnect the wire harnesses around the electrical box Open the cover of the electrical box.
Page 184 SiUS04-921 Indoor Unit Step Procedure Points The figure shows the arrangement of wiring of wire harnesses (under) and names of parts. (R10151) Disconnect the connector for dehumidifying solenoid valve [S43]. Disconnect the connector for streamer unit [S52]. Removal Procedure...
Page 185 Indoor Unit SiUS04-921 Step Procedure Points  The connector [S41] is for Disconnect the connector for swing motor [S41]. both horizontal blades and vertical blades. Disconnect the connector for fan motor [S1], and release the 1 hook. (R10152) (R10153) Removal Procedure...
Page 186 SiUS04-921 Indoor Unit Step Procedure Points Remove the screw of the drip proof cover. Remove the screw of the ground wire.  Be careful not to lose the clip Disconnect the heat exchanger thermistor. for thermistor. 2. Removal of the electrical box Remove the screw of the electrical box.
Page 187 Indoor Unit SiUS04-921 Step Procedure Points Close the cover and slide to undo the hook in the key hole. Push up the bottom side of the electrical box, or push the bottom frame to the back. (R10156) Release the upper hook first.
Page 188: Removal Of Pcb
SiUS04-921 Indoor Unit Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the shelter Preparation  Remove the electrical box External appearance of according to "Removal of the the electrical box.
Page 189 Indoor Unit SiUS04-921 Step Procedure Points Slide the cover upward while lifting up (without being hooked) and undo the 2 sockets. (R10163) 2. Removal of the power supply terminal board Remove the 1 screw and pull out the terminal board sideward.
Page 190 SiUS04-921 Indoor Unit Step Procedure Points Release the ground wire from the hook. (R10167) Disconnect the [S46]: to the display PCB [S56] connectors [S46] and [S48]: to the sensor PCB [CN1] [S48]. Push out the connector for reduction motor mechanism while pinching the connector from the back side of the electrical box cover.
Page 191 Indoor Unit SiUS04-921 Step Procedure Points Names of parts of the control PCB. [S1]: Fan motor [S43]: Solenoid valve [S21]: HA [S46]: to Display PCB [S32]: Heat exchanger [S48]: to Sensor PCB thermistor [S51]: Open/close [S41]: Swing motor mechanism [S52]: Streamer unit 4.
Page 192 SiUS04-921 Indoor Unit Step Procedure Points (R10172)  Using a flat screwdriver Release the upper hook. makes it easy to undo the hook. Release the lower hook. (R10173) Removal Procedure...
Page 193 Indoor Unit SiUS04-921 Step Procedure Points  The receiver PCB and the Release the 2 hooks of the receiver PCB and the display PCB are united. 2 hooks of the display PCB. Removal Procedure...
Page 194: Removal Of Dehumidifying Solenoid Valve Coil
SiUS04-921 Indoor Unit Removal of Dehumidifying Solenoid Valve Coil Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Detach the lead wire from Preparation  Remove the front grille the drip proof cover.
Page 195: Removal Of Drain Hose
Indoor Unit SiUS04-921 Removal of Drain Hose Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points  Cover the drain hose with 1. Removal of the drain hose plastic bags or the like so the Remove the screws of the remaining drainage will not...
Page 196 SiUS04-921 Indoor Unit Step Procedure Points  Make sure to check if the Insert the drain hose removed in the previous drain hose is inserted firmly. step. Insert the detached drain plug with an Allen wrench Caution (4mm). Do not push the drain plug with a sharp device like a screwdriver as it can damage the drain plug, resulting in...
Page 197: Removal Of Swing Motor
Indoor Unit SiUS04-921 1.10 Removal of Swing Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the swing motor Preparation  Remove the electrical box for horizontal blade according to "Removal of the There are 3 hooks for the...
Page 198: Removal Of Swing Motor
SiUS04-921 Indoor Unit Step Procedure Points Release the upper hook of the cover with a flat screwdriver.  The hook on the back of the assembly of swing motor. Release the hook of connecting shaft for vertical blades. Remove the assembly of swing motor.
Page 199: Removal Of Heat Exchanger
Indoor Unit SiUS04-921 1.11 Removal of Heat Exchanger Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the refrigerant Preparation  Remove the drain hose piping according to "Removal of Put a wooden block under...
Page 200 SiUS04-921 Indoor Unit Step Procedure Points  When the pipes are 2. Removal of the indoor unit disconnected, protect both Remove the indoor unit the pipe side and unit side from the installation plate. openings from any moisture entering. (R10182) ...
Page 201 Indoor Unit SiUS04-921 Step Procedure Points Remove the 2 fixing screws for heat exchanger on the left. Lift the left side of the heat exchanger, and pull Caution toward yourself. When dismounting or mounting the heat exchanger, be sure to wear gloves or wrap it with cloth before proceeding with the work as fins can injure your hands.
Page 202: Removal Of Propeller Fan / Fan Motor
SiUS04-921 Indoor Unit 1.12 Removal of Propeller Fan / Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the right side Preparation ...
Page 203 Indoor Unit SiUS04-921 Step Procedure Points Remove the fan motor  The fan motor fixture (lower) and fan rotor. can be removed by pushing the hook. 3. Removal of the fan motor Remove the fixing screw for fan rotor and fan motor.
Page 204 SiUS04-921 Indoor Unit Step Procedure Points Undo the 1 hook of the bearing.  Reassembling the fan motor: The bearing is made of rubber. Push it inward When reassembling the fan firmly and remove it. rotor, provide as much as 0.2inch (5mm) of play between the side face of the rotor and the bottom frame.
Page 205: Removal Of Horizontal Blades / Vertical Blades
Indoor Unit SiUS04-921 1.13 Removal of Horizontal Blades / Vertical Blades Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the horizontal blade Open the horizontal blade (large).
Page 206 SiUS04-921 Indoor Unit Step Procedure Points 2. Removal of the fan guard Release the 4 hooks of the fan guard and pull it out toward yourself to remove. Fan guard Hooks (R10185) 3. Removal of the interlocking shaft Release the hook of the interlocking shaft.
Page 207 Indoor Unit SiUS04-921 Step Procedure Points 4. Removal of the vertical blades Release the 3 hooks of the vertical blades with a flat screwdriver. Remove the vertical blades. Removal Procedure...
Page 208: Removal Of Streamer Unit
SiUS04-921 Indoor Unit 1.14 Removal of Streamer Unit Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the streamer unit Names of parts of the streamer unit.
Page 209 Indoor Unit SiUS04-921 Step Procedure Points Slide the streamer unit to the right side. Remove it toward yourself. (R10189) Cut the clamp and remove the 1 screw of the drip proof cover. 2. Removal of the cover of streamer unit Remove the 2 screws of the cover.
Page 210 SiUS04-921 Indoor Unit Step Procedure Points Turn it back and undo the 7 hooks.  See page 158 for removal of 3. Removal of the deodorizing filter and electrode unit the deodorizing filter. Remove the deodorizing filter and electrode unit. ...
Page 211 Indoor Unit SiUS04-921 Step Procedure Points 4. Removal of the streamer unit Remove the 1 screw of the electrode plate with a precise screwdriver. Release the 2 hooks of the streamer unit PCB. 5. Disconnect the limit switch Disconnect the limit switch.
Page 212: Outdoor Unit
SiUS04-921 Outdoor Unit 2. Outdoor Unit How to Check the Service Monitor (LED A) Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the top panel Remove the 2 screws of the top panel.
Page 213 Outdoor Unit SiUS04-921 Step Procedure Points Lift the electrical box (cover) and remove it. (R10194)  Service monitor (LED A). 3. Remove the drip proof cover Lift the insulation sheet  Check the LED from the slit. and remove it. LEDA SERVICE MONITOR...
Page 214: Removal Of Propeller Fan / Fan Motor
SiUS04-921 Outdoor Unit Removal of Propeller Fan / Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the top panel Remove the 2 screws of the top panel.
Page 215 Outdoor Unit SiUS04-921 Step Procedure Points Remove the 4 screws to remove the front grille. Front grille (R10198) Remove the 1 screw and remove the stop valve cover. (R10199)  When assembling, align the 3. Removal of the propeller fan mark of the propeller fan Remove the fan fixing nut and D cut of the motor shaft.
Page 216 SiUS04-921 Outdoor Unit Step Procedure Points  When assembling the fan motor, let the  mark go upper. (The direction of the lead wire outlet.)  Remove the fan fixing nut with the 13mm spanner. 4. Removal of the fan motor Disconnect the fan motor [S70] connector [S70] from...
Page 217 Outdoor Unit SiUS04-921 Step Procedure Points Remove the 1 screw of the fan motor fixing plate. (R10202)  Heat exchanger fin Detach the upper part of the fan motor fixing plate. Fan motor fixing plate has the 2 hooks on lower part. Removal Procedure...
Page 218 SiUS04-921 Outdoor Unit Step Procedure Points Release the fixing hook for lead wire and detach the lead wire. Remove the 4 screws of the fan motor. Pull out the rubber vibration isolators sideward. Lead wire Propeller fan (R3249)  When assembling, put the lead wire through the back of the motor so as not to be entangled with the propeller...
Page 219: Removal Of Electrical Box
Outdoor Unit SiUS04-921 Removal of Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Disconnect the wire Preparation  Remove the front panel harnesses of the PCB according to "Removal of Disconnect the connector Propeller Fan / Fan Motor."...
Page 220 SiUS04-921 Outdoor Unit Step Procedure Points  Thermistor assembly is in a Disconnect the connector for thermistor assembly set of 3 thermistors: Outdoor [S90] [S90]. air, heat exchanger, and discharge pipe thermistors) (R10207) Disconnect the terminal from the reactor. Purple Orange (R10208) Disconnect the relay...
Page 221 Outdoor Unit SiUS04-921 Step Procedure Points 2. Disconnect the power supply / connecting wiring Radiation shield plate Remove the 2 screws of the radiation shield plate to remove. (R10210) Remove the 1 screw of the ground wire. Earth (R10211) Disconnect all the connecting wires.
Page 222 SiUS04-921 Outdoor Unit Step Procedure Points  Black: power supply Disconnect the connectors: White: power supply black - power supply Red: signal white - power supply red - signal (R0147)  The clip is push-mount type. Undo the clip for the thermistor assembly fixed to the electrical box.
Page 223: Removal Of Pcb
Outdoor Unit SiUS04-921 Removal of PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the 1 screw of the electrical box (cover). Lift the electrical (cover) and remove.
Page 224 SiUS04-921 Outdoor Unit Step Procedure Points  In working, be careful not to Remove the radiation fin from the PCB. break the PCB with the excessive force because the PCB and the radiation fin are adhered to one another  When assembling, make sure to use the silicon material.
Page 225 Outdoor Unit SiUS04-921 Step Procedure Points Cut the 3 fixing clamps for the wire harnesses. (R10223) Remove the 2 fixing screws of the PCB. (R10224) Raise the PCB toward yourself and undo the 3 hooks of the electrical box. (R10225) Removal Procedure...
Page 226 SiUS04-921 Outdoor Unit Step Procedure Points Remove the PCB from the electrical box. (R10226) Names of parts of PCB. S80 S20 LED5(green) Varistor LEDA(green) Fuse 3.15A 250V Fuse HH1(orange) 3.15A 250V (R10227) S20 : Expansion valve S45 : Thermal fuse S70 : Fan motor S80 : Four way valve S90 : Thermistor (outdoor air /...
Page 227: Removal Of Sound Blanket
Outdoor Unit SiUS04-921 Removal of Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the right side Preparation  Remove the electrical box panel according to "Removal of Remove the 3 screws on...
Page 228 SiUS04-921 Outdoor Unit Step Procedure Points  Since the piping ports on the 2. Removal of the sound blanket sound blanket are torn easily, remove the blanket carefully. Lift the sound blanket (top) to remove it. (R10230) Undo the fixing strings of the sound blanket (outer body).
Page 229: Removal Of Thermistor Assembly
Outdoor Unit SiUS04-921 Removal of Thermistor Assembly Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points The figure shows the Preparation Outdoor air thermistor  Remove the thermistor arrangement of the thermistors.
Page 230 SiUS04-921 Outdoor Unit Step Procedure Points Detach the heat exchanger thermistor. (R10237)  Be careful not to loosen the clip for the thermistor.  Since the piping ports on the Lift the sound blanket (top) to remove it. sound blanket are torn easily, remove the blanket carefully.
Page 231: Removal Of Reactor / Partition Plate
Outdoor Unit SiUS04-921 Removal of Reactor / Partition Plate Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the reactor Preparation  Remove the sound blanket Remove the 1 screw and according to "Removal of lift the reactor to remove...
Page 232 SiUS04-921 Outdoor Unit Step Procedure Points  When assembling, make sure to catch the lower hook of the partition plate. Removal Procedure...
Page 233: Removal Of Four Way Valve
Outdoor Unit SiUS04-921 Removal of Four Way Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the peripheral Preparation  Remove the sound blanket parts according to "Removal of Remove the 1 screw of...
Page 234 SiUS04-921 Outdoor Unit Step Procedure Points  Provide a protective sheet or Cautions for restoration a steel plate so that the 1. Restore the piping by non- brazing flame cannot oxidation brazing. influence peripheries. In case of you cannot use the nitrogen gas, restore as ...
Page 235: Removal Of The Expansion Valve
Outdoor Unit SiUS04-921 Removal of the Expansion Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the peripheral parts Preparation  Remove the sound blanket •...
Page 236 SiUS04-921 Outdoor Unit Step Procedure Points  Before working, make sure  Be careful so as not to burn that the refrigerant is empty the heat exchanger fin. in the circuit.  When assembling, make sure  Be sure to apply nitrogen to catch the hook of the replacement when heating expansion valve coil as...
Page 237: Removal Of Compressor
Outdoor Unit SiUS04-921 2.10 Removal of Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removal of the peripheral Preparation  Remove the sound blanket parts according to "Removal of Remove the terminal...
Page 238 SiUS04-921 Outdoor Unit Step Procedure Points  Provide a protective sheet or Warning a steel plate so that the Ventilate when refrigerant brazing flame cannot leaks during the work . influence peripheries. If refrigerant contacts fire, it will cause toxic gas. ...
Page 239 Outdoor Unit SiUS04-921 Removal Procedure...
Page 240: Others Additional Information
SiUS04-921 Part 8 Additional Information 1. Additional Information ................232 1.1 Trial Operation..................232 1.2 Field Setting ..................233 1.3 Application of Silicon Grease to a Power Transistor and a Diode Bridge..................234 Additional Information...
Page 241: Additional Information
Additional Information SiUS04-921 1. Additional Information Trial Operation 1.1.1 Trial Operation and Testing 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.
Page 242: Field Setting
SiUS04-921 Additional Information Field Setting 1.2.1 How to set the different addresses When 2 indoor units are installed in 1 room, the 2 wireless remote controllers can be set for different addresses. 1) Remove the front grille. (3 screws) 2) Cut the address jumper “JA”. Electric parts box cover Fig.
Page 243: Application Of Silicon Grease To A Power Transistor And A Diode Bridge234
Additional Information SiUS04-921 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 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 heat radiation fin) of the power transistor and diode bridge.
Page 244: Appendix
SiUS04-921 Part 9 Appendix 1. Piping Diagrams..................236 1.1 Indoor Units ..................236 1.2 Outdoor Units ..................236 2. Wiring Diagrams..................237 2.1 Indoor Units ..................237 2.2 Outdoor Units ..................237 Appendix...
Page 245: Piping Diagrams
Piping Diagrams SiUS04-921 1. Piping Diagrams Indoor Units FTXG09/12/15HVJU INDOOR UNIT HEAT EXCHANGER THERMISTOR SOLENOID VALVE ON HEAT EXCH. AT RATED VOLTAGE: CLOSED (UNDER DEHUMIDIFICATION OPERATION) CROSS FLOW FAN HEAT EXCHANGER FAN MOTOR FIELD PIPING 1/ 4(6.4)CuT SINGLE UNION JOINT 3/8(9.5)CuT FIELD PIPING 3/8(9.5)CuT...
Page 246: Wiring Diagrams
SiUS04-921 Wiring Diagrams 2. Wiring Diagrams Indoor Units FTXG09/12/15HVJU A1P~A5P : PRINTED CIRCUIT BOARD : FLAME GROUND : FUSE : MULTI MONITOR CAUTION H2P, H3P : PILOT LAMP outdoor NOTE THAT OPERATION WILL : LIMIT SWITCH FOR PANEL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS : LIMIT SWITCH FOR STREAMER TURNED OFF AND THEN BACK...
Page 247 Wiring Diagrams SiUS04-921 Appendix...
Page 248: Index
SiUS04-921 Index Symbols thermistor resistance check ......141 check no.11 ............143 "inverter checker" check........145 check no.12 ............144 "sarara" drying operation........14, 73 check no.14 ............145 Numerics check no.15 ............146 check no.16 ............147 1/f fluctuation............20 check no.17 ............148 24-hour on/off timer..........30 check no.18 ............
Page 249 SiUS04-921 diagnosis mode ............32 u4 ............106, 135 different addresses..........233 u7 ..............138 diode bridge ............234 ua ..............108 discharge pipe temperature control....45, 117 error code indication ..........87 discharge pipe thermistor......124, 221 expansion valve ............ 226 discharge pressure check ........147 expansion valve coil..........
Page 250 SiUS04-921 h9 ................124 ha ................8 main circuit electrolytic capacitor check....143 hall ic ...............99 main circuit short check ........151 heat exchanger (indoor) ........190 mold proof stick............26 heating operation ............74 monitor brightness setting........24 high pressure control..........97 multi monitor ............24 high pressure control in cooling ......118 multi-colored indicator lamp........
Page 251 SiUS04-921 radiation fin............128, 215 thermistor radiation fin thermistor...........124 discharge pipe thermistor ....... 124, 221 reactor ............211, 222 indoor heat exchanger thermistor ..103, 177 receiver pcb............182 outdoor air thermistor ........124 reduction motor .............171 outdoor heat exchanger thermistor ..124, 221 refrigerant system check ........144 radiation fin thermistor........
Page 252 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.

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Daikin Quaternity FTXG09HVJU Service Manual

Part 1

List of Functions

Part 2

Specifications

Part 3

Printed Circuit Board

Connector Wiring Diagram

Part 4

Function and Control

Part 5

System Configuration

Service Diagnosis

Part 7

Removal Procedure

Part 8

Others Additional Information

Part 9

Appendix

Index

Quick Links

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Summary of Contents for Daikin Quaternity FTXG09HVJU