Toshiba RAS-25U2FVG-ND Service Manual
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Toshiba RAS-25U2FVG-ND Service Manual

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SERVICE MANUAL
Indoor Unit
<Console, Heat Pump Type>
RAS-25U2FVG-ND
RAS-35U2FVG-ND
R32
FILE NO. SVM-19082
SPLIT TYPE
RAS-25U2AVPG-ND
RAS-35U2AVPG-ND
August, 2019

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Summary of Contents for Toshiba RAS-25U2FVG-ND

  • Page 1 FILE NO. SVM-19082 SERVICE MANUAL SPLIT TYPE Indoor Unit <Console, Heat Pump Type> RAS-25U2FVG-ND RAS-25U2AVPG-ND RAS-35U2FVG-ND RAS-35U2AVPG-ND August, 2019...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ................3 2. SPECIFICATIONS ..................7 3. REFRIGERANT R32 ................. 9 4. CONSTRUCTION VIEWS ................ 17 5. WIRING DIAGRAM .................. 19 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 21 7. REFRIGERANT CYCLE DIAGRAM ............22 8. CONTROL BLOCK DIAGRAM ..............25 9.

  • Page 3: Safety Precautions

    1. SAFETY PRECAUTIONS SAFETY PRECAUTIONS The important contents concerned to the safety are described on the product itself and on this Service Manual. Please read this Service Manual after understanding the described items thoroughly in the following contents (Indications/Illustrated marks), and keep them. [Explanation of indications] Indication Explanation...
  • Page 4 Read the precautions in this manual This appliance is fi lled with R32. carefully before operating the unit. (Flammable Material) Information included in the Operation Service personnel should be handing this equipment Manual and/or Installation Manual. with reference to the Installation Manual. For general public use Power supply cord of outdoor unit shall be more than 1.5 mm (H07RN-F or 60245IEC66) polychloroprene...
  • Page 5 DANGER • ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO IN- STALL/MAINTAIN THE AIR CONDITIONER. INAPPROPRIATE SERVICING MAY RESULT IN WATER LEAKAGE, ELECTRIC SHOCK OR FIRE. • TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE ALL POWER SWITCHES ARE OFF.
  • Page 6 Do not pierce or burn as the appliance is pressurized. Do not expose the appliance to heat, flame, sparks, or • other sources or ignition. Else, it may explode and cause injury or death. • For R32 model, use pipes, flare nut and tools which is specified for R32 refrigerant. Using of existing (R22) piping, flare nut and tools may cause abnormally high pressure in the refrigerant cycle (piping), and possibly result in explosion and injury.

  • Page 7: Specifications

    Outdoor (Cooling / Heating) -15-46/-30-24 -15-46/-30-24 Accessory Indoor unit Installation plate Wireless remote controller Batteries Toshiba New IAQ Filter Install screw Remote controller holder Pan head wood screw for Remote control holder Insulate pipe Installation manual Owner's manual Outdoor unit...
  • Page 8 2-2. Operation Characteristic Curve <Cooling> <Heating> RAS-35U2FVG-ND RAS-35U2FVG-ND RAS-25U2FVG-ND RAS-25U2FVG-ND Conditions Conditions Indoor : DB 27 C/WB 19 Indoor : DB 20 C/WB 15 Outdoor : DB 35 C/WB 24 Outdoor : DB 7 C/WB 6 Indoor Air Flow : High...

  • Page 9: Refrigerant R32

    3. REFRIGERANT R32 3. If a refrigeration gas leakage occurs during This air conditioner adopts the new refrigerant HFC installation/servicing, be sure to ventilate fully. (R32) which does not damage the ozone layer. If the refrigerant gas comes into contact with fire, a The next section describes the precautions for air poisonous gas may occur.
  • Page 10 Table 3-2-1 Thicknesses of annealed copper pipes Thickness (mm) Nominal diameter Outer diameter (mm) 6.35 0.80 0.80 9.52 0.80 0.80 12.70 0.80 0.80 15.88 1.00 1.00 2. Joints For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants. a) Flare Joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm.
  • Page 11 d) Flare Processing Make certain that a clamp bar and copper pipe have been cleaned. ØD By means of the clamp bar, perform the flare processing correctly. Use either a flare tool for R32 or conven- tional flare tool. Flare processing dimensions differ according to the type of flare tool.
  • Page 12 Table 3-2-6 Flare and flare nut dimensions for R22 Dimension (mm) Nominal Outer diameter Thickness Flare nut width diameter (mm) (mm) (mm) 6.35 9.52 13.0 13.5 12.70 16.2 16.0 12.9 15.88 19.7 19.0 16.0 19.05 23.3 24.0 19.2 Fig. 3-2-2 Relations between flare nut and flare seal surface 2.
  • Page 13 3-3. Tools 3-3-1. Required Tools The service port diameter of packed valve of the outdoor unit in the air-water heat pump using R32 is changed to prevent mixing of other refrigerant. To reinforce the pressure-resisting strength, flare processing dimensions and opposite side dimension of flare nut (For Ø12.7 copper pipe) of the refrigerant piping are lengthened.
  • Page 14 3-4. Recharging of Refrigerant When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following steps. Recover the refrigerant, and check no refrigerant remains in the equipment. When the compound gauge’s pointer has indicated –0.1 Mpa (–76 cmHg), place the handle Low in the fully closed position, and turn off the vacuum pump’s power switch.
  • Page 15 1. Be sure to make setting so that liquid can be charged. 2. When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down. It is necessary for charging refrigerant under condition of liquid because R32 is mixed type of refrigerant. Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the cylinder upside down if cylinder is not equipped with siphon.
  • Page 16 2. Characteristics required for flux 3-5-3. Brazing • Activated temperature of flux coincides with the As brazing work requires sophisticated techniques, brazing temperature. experiences based upon a theoretical knowledge, it must be performed by a person qualified. • Due to a wide effective temperature range, flux is hard to carbonize.

  • Page 17: Construction Views

    Indoor Unit 4-1. Connecting pipe RAS-25U2FVG-ND RAS-35U2FVG-ND Wiress remote controller 17.5 Remote controller holder - 17 -...
  • Page 18 4-2. Outdoor Unit 2 - R5.5 x 17L U-Shape (For ∅8 - ∅10 anchor bolt) 6 hole R5.5 A detail drawing (Back leg) 6 hole 11x14 hole 25 Drain outlet 11x14 Hole (For 10 anchor bolt) B detail drawing (Front leg) FAN-GUARD COVER-PV ViewZ...

  • Page 19: Wiring Diagram

    5. WIRING DIAGRAM RAS-25U2FVG-ND / RAS-25U2AVPG-ND WP-030 Outdoor Control P.C. Board t° 250V M M S S 3.15A 250V CN31 (WHI) Serial Communication Circuit Switching Power Supply CN72 CN62 CN63 CN64 CN71 CN52 CN61 CN73 (WHI) (YEL) (WHI) (WHI) (WHI)
  • Page 20 RAS-35U2FVG-ND / RAS-35U2AVPG-ND WP-030 Outdoor Control P.C. Board t° 250V M M S S 3.15A 250V CN31 (WHI) Serial Communication Circuit Switching Power Supply CN72 CN71 CN52 CN61 CN62 CN63 CN64 CN73 (YEL) (WHI) (WHI) (WHI) (WHI) (WHI) (WHI) (WHI) 1 2 3 4 5 6 1 2 3 1 2 3...

  • Page 21: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Part s n ame Type Specif icat io ns Fan motor (for indoor) ICF-340-41-1 DC340, 41W Room temp. sensor (TA-sensor) ( - ) at 25°C Ω 10kΩ at 25°C Heat exchanger temp. sensor (TC-sensor) Heat exchanger temp.

  • Page 22: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram RAS-25U2FVG-ND / RAS-25U2AVPG-ND Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 25m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia.
  • Page 23 RAS-35U2FVG-ND / RAS-35U2AVPG-ND Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 25m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Outer dia. : 6.35mm Charge : 20g/m Vacuum pump connecting port Thickness : 0.8mm (16 to 25m) Sectional shape...
  • Page 24 7-2. Operation Data <Cooling> Tempeature Heat exchanger Model name Standard Indoor Outdoor Compressor Connecting condition(°C) pipe temp. pressure fan mode fan mode revolution piping Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 1.1 to 1.2 12 to 13 37 to 40 High High 25U2FVG-ND...

  • Page 25: Control Block Diagram

    8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit Indoor Unit Control Unit Heat Exchanger Sensor (TCJ) M.C.U. Louver Functions Motor Heat Exchanger Sensor (TC) • Cold draft preventing Function Room Temperature Sensor (TA) • 3-minute Delay at Restart for Compressor Louver Motor Drive Control •...
  • Page 26 8-2. Outdoor Unit (Inverter Assembly) - 26 -...

  • Page 27: Operation Description

    9. OPERATION DESCRIPTION • Detection of inverter input current and current 9-1. Outline of Air Conditioner Control release operation This air conditioner is a capacity-variable type air • Over-current detection and prevention operation conditioner, which uses DC motor for the indoor fan to IGBT module (Compressor stop function) motor and the outdoor fan motor.
  • Page 28 9-2. Operation Description 1. Basic operation ......................29 1. Operation control ....................29 2. Cooling/Heating operation ..................30 3. AUTO operation ......................30 4. DRY operation ......................31 2. Indoor fan motor control ..................... 32 3. Outdoor fan motor control .................... 35 Capacity control ......................

  • Page 29: Operation Control

    Item Operation flow and applicable data, etc. Description 1. Basic 1. Operation control operation Receiving the user’s operation condition setup, the operation statuses of indoor/outdoor units are controlled. 1) The operation conditions are selected by the remote controller or indoor unit display buttons as shown in the bolow.

  • Page 30: Basic Operation

    Operation flow and applicable data, etc. Description Item 1. Basic 2. Cooling/Heating operation operation The operations are performed in the following parts by controls according to cooling/heating conditions. 1) Receiving the operation ON signal of the remote controller, the cooling or heating operation signal starts being transferred form the indoor controller to the outdoor unit.

  • Page 31: Dry Operation

    Item Operation flow and applicable data, etc. Description 1. Basic 4. DRY operation 1) Detects the room temperature (TA) when operation the DRY operation started. DRY operation is performed according to the difference between room temperature and the setup 2) Starts operation under conditions in the temperature as shown below.

  • Page 32: Indoor Fan Motor Control

    L+(W8) *8 : Fan speed = (H −L+) x 1/4 + L+ (Linear appro ximation from H and L+) (table 1) Indoor fan air flow rate <Cooling> Fan speed RAS-25U2FVG-ND RAS-35U2FVG-ND level Cool Fan speed Air flow rate Fan speed...
  • Page 33 Item Operation flow and applicable data, etc. Description 2. Indoor fan <In heating operation> 1) When setting the fan speed to L, motor control L+, M, M+ or H on the remote controller, the operation is per- formed with the constant speed HEAT ON shown in Fig.
  • Page 34 • When 25 minutes or more passed after operation start FAN Manual • Room temp. < Set temp. –4°C • Room temp. = Set temp. –3.5°C (Table 2) Indoor fan air flow rate <Heating> Fan speed RAS-25U2FVG-ND RAS-35U2FVG-ND level HEAT Fan speed Air flow rate...

  • Page 35: Outdoor Fan Motor Control

    Item Operation flow and applicable data, etc. Description 3. Outdoor fan The blowing air volume at the outdoor unit side is controlled. 1) The operation command sent motor control from the remote controller is Receiving the operation command from the controller of processed by the indoor unit indoor unit, the controller of outdoor unit controls fan speed.

  • Page 36: Capacity Control

    Item Operation flow and applicable data, etc. Description 4. Capacity The cooling or heating capacity depending on the load is 1) The difference between set control adjusted. temperature on remote controller (Ts) and room temperature (Ta) According to difference between the setup value of tempera- is calculated.

  • Page 37: Release Protective Control By Temperature Of Indoor Heat Exchanger

    Item Operation flow and applicable data, etc. Description 6. Release protective <In cooling/dry operation> 1) When temperature of the indoor control by tempera- heat exchanger drops below 5°C, (Prevent-freezing control for indoor heat exchanger) ture of indoor heat the compressor speed is In cooling/dry operation, the sensor of indoor heat exchanger reduced.

  • Page 38: Defrost Control (Only In Heating Operation)

    Item Operation flow and applicable data, etc. Description 7. Defrost control (This function removes frost adhered to the outdoor The necessity of defrost operation is (Only in heating heat exchanger.) detected by the outdoor heat exchanger operation) temperature. The conditions to detect the The temperature sensor of the outdoor heat ex- necessity of defrost operation differ in A, changer (Te sensor) judges the frosting status of the...
  • Page 39 Item Operation flow and applicable data, etc. Description • Strong defrost <Finish of defrost operation for strong 7. Defrost control Upgrade defrost ability when normal defrost ability (Only in heating defrost> is not enough by increase defrosting finished operation) • Returning conditions from defrost operation.

  • Page 40: Air Outlet Selection

    Item Operation flow and applicable data,etc Description 1. Purpose 8. Air outlet < How to change air outlet selection > selection 1. Operate the air conditioner and select cooling or heating mode. (Air outlet selection can't be changed at standby mode.) 2.

  • Page 41: Lower Air Outlet Louver Control

    Item Operation flow and applicable data,etc Description 8. Air outlet < How to set to change upper-flow at Bi-flow setting in selection cooling 1. Stop operation. 2. Push and hold AIR OUTLET SELECT button on the unit operation panel over 10seconds (less than 20seconds). AIR OUTLET SELECT button 3.

  • Page 42: Upper Air Outlet Louver Control

    Item Operation flow and applicable data,etc Description 1. Description 10. Upper air Upper louver position can be arbitrarily set pu by pushing outlet [FIX] button of the remote control. louver · Upper louver position is stored in control memory by the microcomputer, and the louver returns to the stored position when the next operation is performed.

  • Page 43: Eco Operation

    * 10 (DRY max - COOL min) /6 x 3 + COOL min * 9 (DRY max - COOL min) /6 x 2 + COOL min * 8 (DRY max - COOL min) /6 x 1 + COOL min RAS-25U2FVG-ND RAS-35U2FVG-ND Cool min DRY max <Heating operation>...

  • Page 44: Test Operation

    Item Operation flow and applicable data, etc. Description 12. Test When keeping [OPERATION] button pressed for 1) When pressing [OPERATION] button, the operation 10 seconds or more, the temporary [COOL] operation previous setting operation starts. is performed. 2) When keeping [OPERATION] button pressed for 3 seconds or more, Pi, Pi, Pi sound is heard and [AUTO RESTART] control is changed.

  • Page 45: Pulse Modulating Valve (P .M.v.) Control

    Item Operation flow and applicable data, etc. Description This function controls throttle amount of the 1) When starting the operation, move the 14. Pulse refrigerant in the refrigerating cycle. valve once until it fits to the stopper. Modulating (Initialize) valve According to operating status of the air conditioner, (P.M.V.) control this function also controls the open degree of valve...

  • Page 46: Self-Cleaning Function

    Item Operation flow and applicable data, etc. Description 1. Purpose 15. Self-Cleaning function The Self-Cleaning operation is to minimize the growth of mold, bacteria etc. by running the fan and drying so as to keep the inside of the air conditioner clean. Unit now performing cooling or dry operation Self-Cleaning operation When the cooling or dry operation shuts...

  • Page 47: Self-Cleaning Function Release

    Item Operation flow and applicable data, etc. Description • Self-Cleaning diagram 15. Self-Cleaning function Operation display FCU fan rpm is depend on presetting. (240RPM) Upper airoutlet OPEN OPEN (11º) CLOSE OPEN or CLOSE OPEN or CLOSE OPEN or CLOSE Lower airoutlet depend on airoutlet selection depend on airoutlet selection depend on airoutlet selection...

  • Page 48: Remote-A Or B Selection

    Item Operation flow and applicable data, etc. Description 17. Remote-A or B Setting the remote controller 1. Purpose selection To separate using of remote control for each indoor This operation is to operate only one unit in case of 2 air conditioner are installed nearly. indoor unit using one remote controller.

  • Page 49: Short Timer

    Item Operation flow and applicable data, etc. Description 20. Short Timer In the normal condition, after switching one circuit Purpose breaker, 3-minute delay time for compressor and To start the unit immediately for the purpose of 1 hour for plasma air purifier are set for the testing, trial...etc, short timer can be used.

  • Page 50: Power Selection Mode

    Item Operation flow and applicable data,etc Description ([POWER-SEL] button on the remote controller 1. Purpose 22. POWER Selection is pressed) The function is used when its circuit Mode − Power Selection 75% is 75% of maximum breaker is shared with other electrical current.

  • Page 51: Outdoor Quiet Control

    As the maximum number of revolution of the compressor is restricted, the rise-up performance at the start time is weakened. <Maximum number of revolution of compressor at normal time and Quiet control time> RAS-25U2FVG-ND RAS-35U2FVG-ND Outside temp. Normal time Normal time...

  • Page 52: Fireplace Operation

    Item Operation flow and applicable data,etc Description 26. Fireplace Fireplace button on remote controller is pressed. Keep air circulation during other heat Operation Fireplace 1: source applied. Cancel cold draft prevention control and fan Note: speed depend on user require base on basic With Fireplace operation on heating control.

  • Page 53: Set Temp. Correction

    Item Operation flow and applicable data,etc Description 1. Purpose 28. Set temp. Set temp. can be corrected by changing the set temp. correction When the difference between the set correnction value. Initial setting of the set temp. correction value is 0. temperature of the remote control and the room temperature is wide due to Set temp.

  • Page 54: Outdoor Quiet Control

    Item Operation flow and applicable data,etc Description As shown in the table, the max. revolution number of 1. Purpose 29. Outdoor compressor can be reduced. For the users who concern about Quiet As the max. number of revolution of compressor is restricted. control noise of the outdoor unit, this control the rise-up performance at the start time is weakened.
  • Page 55 Item Operation flow and applicable data,etc Description When air conditioner is in operation before setting. 29. Outdoor Quiet < How to set Outdoor Quiet control > control 1. Push and hold OPERATION button for 20seconds. • After pushing OPERATION button, air (for only conditioner stops operation.

  • Page 56: Auto Restart Function

    9-3. Auto Restart Function This indoor unit is equipped with an automatic restarting function which allows the unit to restart operating with the set operating conditions in the event of a power supply being accidentally shut down. The operation will resume without warning three minutes after power is restored. 9-3-1.

  • Page 57: Power Failure During Timer Operation

    9-3-2. How to Set the Auto Restart Function To set the auto restart function, proceed as follows: Repeat the setting procedure. The unit receives the signal and beeps three times. The unit then restarts operating automatically in the event of power supply being accidentally shut down. •...

  • Page 58: Remote Control

    9-4. Remote Controller and Its Fuctions 9-4- 1. Parts Name of Remote Controller I nfrared signal emitter Memory and preset button (PRESET) Start/Stop button Temperature up/down button (TEMP.) Mode select button (MODE) Swing louver button (SWING) Fan speed button (FAN) FLOOR button (FLOOR) 8 degree Celsius operation and Fireplace function ( Button Economy button (ECO)
  • Page 59 How to set WEEKLY TIMER Press to enter WEEKLY TIMER setting. Blink Press to select desired day in sequence. The sequence of day symbol appears on the LCD WEEKLY SUMO TUWETHFRSA (All day) Press to select the program number. l The program 1 is ready for setting while is pressed PG-1 appears on the LCD.
  • Page 60 Press to select desired operation. Press to select desired temperature. • The temperature can be set between 17°C and 30°C. Press to select the desired fan speed. Add operations, if required. • Press to use 8°C operation. (Notes: Fireplace cannot select and memorize in weekly function) •...
  • Page 61 Edit Weekly timer program Page 56 , follow steps 1 - 3 below. To edit the program after confirming the weekly timer setting on Press l The day of the week and the program number of the current day will be displayed. Press to select the day of the week and press to select...
  • Page 62 To delete programs The individual program Press l The day of the week and the program number is displayed. l Select the day to delete the program. Press to select the program number to be deleted. Press l ON or OFF timer will be cleared and the LCD will blink. Press to delete the program.
  • Page 63 2. AUTOMATIC OPERATION To automatically select cooling, heating, or fan only operation. Press Press : Select Auto A. : Select the desired temperature : Min 17°C, Max 30°C Press Press : Select AUTO, LOW , LOW+ , MED , MED+ 3.
  • Page 64 8. AIR VOLUME, AIR DIRECTION AND SWING LOUVERS Changing the air volume, press FAN button Changing the air direction, press FIX button When changing the air to the vertical direction, release the Fix button at the desired position. at the lower limit). PiPi Changing the air direction, press FIX button 9.
  • Page 65 10. PRESET OPERATION Set your preferred operation for future use. The setting will be memorized by the unit for future operation (except air flow direction). 1. Select your preferred operation. 2. Press and ho ld for 3 seconds to memorize the setting. The mark displays.
  • Page 66 15. SELF CLEANING OPERATION (COOL AND DRY OPERATION ONLY) Cleaning operation This function is used to dry the inside of the air conditioner to reduce to growth of mold, etc. indide the air conditioner. • When the unit shuts down after having operated for 10 or more minutes in the cooling or dry mode, the cleaning operation is started automatically, and the TIMER indicator on the nuit's display panel turns on.
  • Page 67 17. TROUBLESHOOTING (CHECK POINT) The unit does not operate. Cooling or Heating is abnormally low • The power main switch is turned off. • The filters are blocked with dust. • The circuit breader is activated to cut • The temperature has been set improperly. •...
  • Page 68 4 stages of brightness can be changed. Temperature indicator Other lamp Usual Usual Darkness Darkness Turn off Darkness Turn off Turn off 20. CHANGE AIR OUTLET GRILLE ON STABLE TIME (COOLING ONLY) On cooling operation, whichever air outlet is set, only Upper is used when the room temperature approaches the ser temperature.

  • Page 69: Name And Functions Of Indications On Remote Controller

    9-4-3. Name and Functions of Indications on Remote Controller [Display] All indications, except for the clock time indicator, are displayed by pressing the button. Transmission mark TIMER and weekly timer indicator This transmission mark indicates when the The time setting for timer operation and weekly remote controller transmits signals to the indoor timer function is indicated.

  • Page 70: Indoor Unit Display & Unit Operation Panel

    9-5. Indoor Unit Display & Unit Operation Panel This indoor unit can be operated with the unit operation panel or using remote control. Operational contents will be followed the one which was operated later. If change the set temperature with operation panel of unit, temperature indication will be changed, but the temperature display on the remote control will not change.

  • Page 71: Installation Procedure

    10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units Do not allow the drain hose to get slack. Air fi lter Installation plate Cut the piping hole sloped slightly. 50 mm or more 50 mm or more Make sure to run the drain hose Filter sloped downward.
  • Page 72 10-2. Optional Parts, Accessories and Tools 10-2-1. Optional Installation Parts Part Parts name Q’ty code Refrigerant piping Liquid side : Ø6.35 mm each Gas side : Ø9.52 mm Pipe insulating material (polyethylene foam, 8 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit>...
  • Page 73 10-2-2. Accessory and installation parts ACCESSORY AND INSTALLATION PARTS Parts name (Q’ty) Parts name (Q’ty) Wireless remote control* × 1 Installation plate* × 1 Battery × 2 Remote control holder* × 1 Filter** Filter** Mounting screw** Ø4 × 25R× 8 Flat head wood screw Ø3.1 ×...
  • Page 74 10-2-3. Installation/Servicing Tools Changes in the product and components In the case of an air conditioner using R32, in order to prevent any other refrigerant from being charged accidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed. (1/2 UNF 20 threads per inch) •...
  • Page 75 10-3. Indoor Unit Mounting the installation plate and screw position 10-3-1. Installation Place (Unit : mm) • A place which provides the spaces around the indoor unit as shown in the diagram. • A place where there are no obstacles near the air inlet and outlet. •...
  • Page 76 2. Put water in the drain pan and make sure that the water is drained out of 10-3-3. How to Install Indoor Unit doors. 3. When connecting extension drain hose, insulate the connecting part of 1. Remove the air inlet grille. Open the air inlet grille and remove the strap. extension drain hose with shield pipe.
  • Page 77 Mounting directly on the floor 1) Fix the leg of indoor unit on the fl oor with 2 mounting screws. 2) Fix the upper part of indoor unit on the wall with 4 mounting screws. For prevent dewfall (Floor installation) Wall burying mode Slit 2.
  • Page 78 (Front view) 70 or more 800 or more 10-4-2. Precautions about Installation in Opening for receiver Regions with Snowfall and Cold Temperatures • Do not use the supplied drain nipple for draining water. Drain the water from all the drain holes directly.
  • Page 79 Draining the Water 10-4-3. Refrigerant piping connection <Flaring> Holes are provided on the base plate of the • 1. Cut the pipe with a pipe cutter. outdoor unit to ensure that the defrost water 2. Deburr the inside of the pipe at its end. produced during heating operations is drained Take steps to ensure that the removed burrs will not off efficiently.
  • Page 80 AIR PURGE CAUTION Evacuate the air in the connecting pipes and in the • KEEP IMPORTANT 6 POINTS FOR PIPING WORK indoor unit using a vacuum pump. Do not use the Take away dust and moisture (inside of the refrigerant in the outdoor unit. For details, see the connecting pipes).
  • Page 81 1. The supply voltage must be the same as the rated 10-5-1. Gas Leak Test voltage of the air conditioner. 2. Prepare the power source for exclusive use with the air conditioner. Model RAS-25U2FVG-ND RAS-35U2FVG-ND Power source 220–240V ~ 50Hz 220–240V ~ 50Hz 10.3A Maximum running current 10.5A...
  • Page 82 10-5-5. Auto Restart Setting 10-5-3. Remote Control A-B Selection This product is designed so that, after a power failure, it can restart To separate using of remote control for each indoor unit in case of 2 air automatically in the same operating mode as before the power failure. conditioners are installed nearly.

  • Page 83: How To Diagnose The Trouble

    11. HOW TO DIAGNOSE THE TROUBLE The pulse motor circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles according to the trouble diagnosis procedure as described below. (Refer to the check points in servicing written on the wiring diagrams attached to the indoor/outdoor units.) Table 11-1 Troubleshooting Procedure...
  • Page 84 11-1. First Confirmation 11-1-1. Confirmation of Power Supply Confirm that the power breaker operates (ON) normally. 11-1-2. Confirmation of Power Voltage Confirm that power voltage is AC 220–230–240 ± 10%. If power voltage is not in this range, the unit may not operate normally. 11-1-3.
  • Page 85 11-2. Primary Judgment To diagnose the troubles, use the following methods. 1) Judgment by flashing LED of indoor unit 2) Self-diagnosis by service check remote controller 3) Judgment of trouble by every symptom Firstly use the method 1) for diagnosis. Then, use the method 2) or 3) to diagnose the details of troubles. 11-3.
  • Page 86 11-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to E in Table 11-4-1, execute the self-diagnosis by the remote controller. 2. When the remote controller is set to the service mode, the indoor controller diagnoses the operation condition and indicates the in formation of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 87 11-4-2 Caution at Servicing 1. After using the service mode of remote controller finished, press the [ ] button to reset the remote controller to normal function. 2. After finished the diagnosis by the remote controller, turn OFF power supply and turn its ON again to reset the air conditioner to normal operation.
  • Page 88 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Serial signal 1) Defective wiring of the Indoor unit Flashes when 1) to 3) The outdoor unit never and connecting connecting cable or operates...
  • Page 89 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Outdoor P.C. Current on inverter circuit All OFF Flashes after 1. Remove connecting lead wire of the board is over limit in short time.
  • Page 90 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Compressor drive output error. All OFF Flashes after 1. Check installation conditions such as (Relation of voltage, current error is detected packed valve opening, refrigerant 8 times*.
  • Page 91 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status Compressor does not rotate. All OFF Flashes after 1. Remove connecting lead wire of the Because of missed wiring, error is detected compressor, and operate again.
  • Page 92 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status The others Return signal of the outdoor Indoor unit Flashes when 1. . Check power supply (Rate +10%) operates error is detected (including...
  • Page 93 11-5. Judgment of Trouble by Every Symptom 11-5-1. Indoor Unit (Including Remote Controller) (1) Power is not turned on (Does not operate entirely) <Primary check> 1. Is the supply voltage normal? 2. Is the normal voltage provided to the outdoor unit? 3.
  • Page 94 (3) Only the indoor motor fan does not operate <Primary check> 1. Is it possible to detect the power supply voltage (AC220–240V) between on the terminal block? 2. Does the indoor fan motor operate in cooling operation? (In heating operation, the indoor fan motor does not operate for approximately 10 minutes after it is turned on, to prevent a cold air from blowing in.) Turn off power supply once, and...
  • Page 95 Is it possible to Does check display Replace change airflow level remote on remote show high? to “HIGH”? Change the new PC Replace board. Does fan speed motor change? Fan motor operates normally. Is it possible to Does check cross-flow Replace bearing rotate cross-flow fan by fan bearing normal...
  • Page 96 (4) Indoor fan motor automatically starts to rotate by turning on power supply <Cause> The IC is built in the indoor fan motor. Therefore the P.C. board is also mounted to inside of the motor. If the P .C. board is soldered imperfectly or the IC is defective, the fan motor may automatically rotate by turning on power supply.
  • Page 97 (5) Troubleshooting for remote control <Primary check> Check that A or B selected on the main unit is matched with A or B selected on the remote control. There is no beep from the indoor unit Push the [ ] button. The OPERATION lamp of the air conditioner main unit does not light Does the transmission...
  • Page 98 11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire) (1) Outdoor unit does not operate 1) Is the voltage between of the indoor terminal block varied? Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the follow- ing diagram.
  • Page 99 11-6. Check Code 1C (Miswiring in indoor/outdoor units) and 1E <Check procedure> Gas leakage, Discharge temp. error, disconnection of TS/TC gas leakage sensors (Check code 02, 1C) (Check code 03, 1E) Valve drive check Is coil of the pulse motor valve Set it correctly.
  • Page 100 11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized Inner Diagnosis of Inverter Assembly Diagnosis/Process flowchart Item Contents Summary Preparation Turn “OFF” the power supply breaker, and remove 3P Remove connector connector which connects of compressor. inverter and compressor. If fuse was blown, be sure to Check •...
  • Page 101 Diagnosis/Process flowchart Item Contents Summary Check Check winding resistance between phases of compres- sor, and resistance between outdoor frames by using a tester. • Is not grounded. → OK if 20MΩ or more Replace control board assembly.  → OK if about 1.02Ω •...
  • Page 102 (3) Check procedures Table 11-8-1 Procedure Check points Causes Turn off the power supply breaker Check whether or not the fuse (F01) Impulse voltage was applied or the and remove the P.C. board or (F02) is blown. indoor fan motor short-circuited. assembly from electronic parts base.
  • Page 103 11-8-2. P .C . Board Layout +12V [1] Sensor characteristic table : Discharge temp. sensor : Room temp. sensor TC,TCJ : Heat exchanger temp. sensor : Outdoor temp. sensor : Suction temp. sensor : Outdoor heat exchanger temp sensor TA,TC,TCJ,TO,TS,TE Temperature (˚C) - 103 -...
  • Page 104 11-8-3. Indoor Unit (Other Parts) Part name Checking procedure Room temp. (TA) sensor Disconnect the connector and measure the resistance value with tester. Heat exchanger (TC,TCJ) (Normal temp.) sensor Temperature 10°C 20°C 25°C 30°C 40°C Sensor TA, TC, TCJ (kΩ) 20.7 12.6 10.0...
  • Page 105 11-8-5. Checking Method for Each Part Part name Checking procedure Electrolytic capacitor 1. Turn OFF the power supply breaker. (For boost, smoothing) 2. Discharge all two capacitors completely. 3. Check that safety valve at the bottom of capacitor is not broken. 4.
  • Page 106 11-9. How to Simply Judge Whether Outdoor Fan Motor is Good or Bad 1. Symptom • Outdoor fan motor does not rotate. • Outdoor fan motor stops within several tens seconds though it started rotating. • Outdoor fan motor rotates or does not rotate according to the position where the fan stopped, etc. Remote controller check code “02 : Outdoor block, 1A : Outdoor fan drive system error”...

  • Page 107: How To Replace The Main Parts

    12. HOW TO REPLACE THE MAIN PARTS WARNING • Since high voltages pass through the electrical parts, turn off the power without fail before proceeding with the repairs. Electric shocks may occur if the power plug is not disconnected. • After the repairs have been completed (after the front panel and cabinet have been installed), perform a test run, and check for smoking, unusual sounds and other abnormalities.
  • Page 108 Part name Procedure Remarks Electrical parts 1) Remove screw for E-box cover. ② Box assembly (E-box) Tube TC sensor TCJ sensor 4) The screw for 1) Screw for E-box cover display base 3) Screw for earth-lead 2) Remove screw for drain guide. (4 pcs) 3) Remove screw for earth-lead.
  • Page 109 Part name Procedure Remarks Electrical parts <How to arrange the lead> ② Display unit lead Box assembly Shown in the picture. (E-box) Louver motor lead Fan motor lead Earth-lead from fan motor base Damper motor lead Heat exchanger 1) Take off the pipe holder. ③...
  • Page 110 Part name Procedure Remarks Louver base 1) Remove screws for louver base. ⑤ Screws for louver base (2 pcs) assembly (2 pcs) 2) - ① Pull the upper part of the louver base to upward. ② ① 2) - ② Take off the louver base by pull out in the front direction.
  • Page 111 Part name Procedure Remarks Turbo fan 1) Turn the flange nut (M10) in the ⑧ counter-clockwise direction and take it off. 2) Pull out the turbo fan from the fan motor shaft. <Attention for turbo fan assemble> The tightening torque of the flange nut is 5N·m.
  • Page 112 Part name Procedure Remarks Fan motor 3) Remove the flange nut and turbo fan. ⑩ (refer to ⑧) 4) Remove screws for motor holder and lead cover. (refer to ⑨) - 112 -...
  • Page 113 12-2. Microcomputer Part name Procedure Remarks  Common procedure 1) Turn the power supply off to stop the Replace terminal block, operation of air-conditioner. microcomputer ass’y and the P .C. board ass’y. 2) Remove the front panel. • Remove the 2 fixing screws. 3) Remove the electrical part base.
  • Page 114 12-3. Outdoor Unit Part name Procedure Remarks  Common 1. Detachment procedure NOTE Wear gloves for this job. Otherwise, you may injure your hands on the parts, etc. 1) Stop operation of the air conditioner, and turn off the main switch of the breaker for air conditioner.
  • Page 115 Part name Procedure Remarks Front cabinet 1. Detachment ‚ 1) Perform step 1 in  2) Remove the fixing screws (ST2TØ4 × 10L 2 pcs.) used to secure the front cabinet and inverter cover, the screws (ST2TØ4 × 10L 4 pcs.) used to secure the front cabinet at the bottom, and the fixing screws (ST2TØ4 ×...
  • Page 116 Part name Procedure Remarks Inverter 1) Perform work of item 1 in  Inverter cover ƒ assembly 2) Remove screw (ST2TØ4 × 10L 2 pcs.) of the upper part of the front cabinet. P.C. board (Soldered surface) • If removing the inverter cover in this condition, P .C.
  • Page 117 Part name Procedure Remarks 1. Disconnect the leads and connectors connected to Control board assembly the other parts from the control board assembly. CN62 CN63 CN61 CN64 CN71 1) Leads • 3 leads (black, white, orange) connected to terminal block. •...
  • Page 118 Part name Procedure Remarks Side cabinet 1. Side cabinet (right) … 1) Perform step 1 in ‚ and all the steps ƒ 2) Remove the fixing screw (ST2TØ4 × 10L 3 pcs.)used for securing the side cabinet to the bottom plate and valve fixing panel. 2.
  • Page 119 Part name Procedure Remarks Compressor ‡ 1) Perform work of item 1 of  … ‚ ƒ „ 2) Extract refrigerant gas. 3) Remove the partition board. (ST2TØ4 × 10L 4 pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, and disconnect lead wire of the compressor from the terminal.
  • Page 120 Part name Procedure Remarks Electronic ‰ 1. Detachment expansion valve 1) Perform step 1 in ‚ , all the steps in ƒ coil and 1 in … 2) Remove the coil by pull it upward. 2. Attachment 1) Insert a valve coil to value body by push it downward.
  • Page 121 Part name Procedures Remarks TS sensor (Suction pipe temperature sensor) • Attachment Install the senser onto the straight pipe part of the suction pipe. Be careful for the lead direction of the sensor. TD sensor (Discharge pipe temperature sensor) • Attachment With its leads pointed upward, install the sensor onto the vertical straight pipe part of the discharge pipe.

  • Page 122: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit Location Part Location Part Description Description 43T00553 FRONT PANEL ASSY 43T49341 SHIELD PIPE 43T09460 INLET GRILLE ASSY 43T72310 DRAIN PAN ASSY 43T80325 AIR FILTER 43T70313 HOSE, DRAIN 43T03379 BACK BODY ASSY 43T22317 DAMPER ASSY 43T39340...
  • Page 123 13-2. Indoor Unit (E-Part) Location Part Location Part Description Description 43T60406 TERMINAL 3P 43T6W670 PC BOARD 43T69320 TEMPERATURE SENSOR (FOR RAS-25U2FVG-ND) 43T50332 SENSOR:HEAT EXCHANGER 43T6W671 PC BOARD 43T50333 SENSOR:HEAT EXCHANGER (FOR RAS-35U2FVG-ND) 43T62003 CORD CLAMP 43T60502 HOUSING-WiFi 43T69865 PC BOARD ASSY,WRS-LED...
  • Page 124 13-3. Outdoor Unit RAS-25U2AVPG-ND 36, 40 63 HOLDER SENSOR(TE) 37, 41 64 HOLDER SENSOR(TD) 65 HOLDER SENSOR(TS) Location Part Location Part Description Description 43T42355 BASE PLATE ASSEMBLY 43T63329 COIL PMV 43T00648 LEFT CABINET 43T46375 4 WAY VALVE 43T00719 RIGHT SIDE CABINET ASSEMBLY 43T63337 4 WAY VALVE COIL ASSEMBLY 43T00561...
  • Page 125 13-4. Outdoor Unit RAS-35U2AVPG-ND 36, 40 63 HOLDER SENSOR(TE) 37, 41 64 HOLDER SENSOR(TD) 65 HOLDER SENSOR(TS) Location Part Location Part Description Description 43T42355 BASE PLATE ASSEMBLY 43T63329 COIL PMV 43T00648 LEFT CABINET 43T46375 4 WAY VALVE 43T00719 RIGHT SIDE CABINET ASSEMBLY 43T63337 4 WAY VALVE COIL ASSEMBLY 43T00561...
  • Page 126 13-5. Outdoor Unit (Part-E) TE-SENSOR TO-SENSOR TS-SENSOR TD-SENSOR Location Part Location Part Description Description 43T62351 HEATSINK 43T60326 FUSE 43T6W672 PC BOARD 43T50369 TEMPERATURE SENSOR (FOR RAS-25U2AVPG-ND) 43T50336 TEMPERATURE SENSOR 43T6W673 PC BOARD 43T50360 TC-SENSOR(TO) (FOR RAS-35U2AVPG-ND) 43T50371 TEMPERATURE SENSOR 43T60384 TERMINAL-6P 43T62313 PC PLATE BASE...
  • Page 127 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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