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Toshiba RAS-18J2KVSG-E Service Manual
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Toshiba RAS-18J2KVSG-E Service Manual

Indoor/outdoor unit, r32 inverter
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SERVICE MANUAL
Indoor Unit
RAS-18J2KVSG-E
RAS-B22J2KVSG-E
RAS-B24J2KVSG-E
RAS-18N4KVSG-E
RAS-B22N4KVSG-E
RAS-B24N4KVSG-E
R32
FILE NO. SVM-20016-2
SPLIT TYPE
Outdoor Unit
RAS-18J2AVSG-E
RAS-22J2AVSG-E
RAS-24J2AVSG-E
Revised on March, 2020

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Summary of Contents for Toshiba RAS-18J2KVSG-E

  • Page 1 FILE NO. SVM-20016-2 SERVICE MANUAL SPLIT TYPE Indoor Unit Outdoor Unit RAS-18J2KVSG-E RAS-18J2AVSG-E RAS-B22J2KVSG-E RAS-22J2AVSG-E RAS-B24J2KVSG-E RAS-24J2AVSG-E RAS-18N4KVSG-E RAS-B22N4KVSG-E RAS-B24N4KVSG-E Revised on March, 2020...
  • Page 2 CONTENTS 1. SAFETY PRECAUTIONS ................3 2. SPECIFICATIONS ..................6 3. REFRIGERANT R32 .................10 4. CONSTRUCTION VIEWS ................ 18 5. WIRING DIAGRAM .................. 21 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 24 7. REFRIGERANT CYCLE DIAGRAM ............25 8. CONTROL BLOCK DIAGRAM ..............28 9.
  • Page 3 1. SAFETY PRECAUTIONS 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 4 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 5 • 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 6 2. SPECIFICATIONS 2-1. Specification RAS-18J2KVSG-E, Unit model Indoor RAS-B22J2KVSG-E, RAS-18N4KVSG-E RAS-B22N4KVSG-E Outdoor RAS-18J2AVSG-E RAS-22J2AVSG-E 5.00 6.10 Cooling capacity (kW) 1.20-6.00 Cooling capacity range (kW) 1.39-6.70 6.00 Heating capacity (kW) 7.00 1.10-6.50 1.15-7.50 Heating capacity range (kW) Power supply 1Ph/50Hz/220-240V Electric...
  • Page 7 Outdoor (Cooling / Heating) Installation plate Accessory Indoor unit Wireless remote controller Batteries Remote controller holder Toshiba IAQ filter Mounting screw 6(  4x25L) Remote controller holder 2(  3.1x16L) Flat head wood screw Installation manual Owner's manual * The specification may be subject to change without notice for purpose of improvement.
  • Page 8 2-3. Operation Characteristic Curve <Cooling> <Heating> RAS-B22J2KVSG-E RAS-B22J2KVSG-E RAS-B24J2KVSG-E RAS-B24J2KVSG-E RAS-18J2KVSG-E RAS-18J2KVSG-E 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 Indoor Air Flow : High Pipe Length : 7.5 m...
  • Page 9 2-3. Operation Characteristic Curve <Cooling> <Heating> RAS-B22N4KVSG-E RAS-B22N4KVSG-E RAS-B24N4KVSG-E RAS-B24N4KVSG-E RAS-18N4KVSG-E RAS-18N4KVSG-E 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 Indoor Air Flow : High Pipe Length : 7.5 m Pipe Length : 7.5 m...
  • Page 10 3. REFRIGERANT R32 3. If a refrigeration gas leakage occurs during This air conditioner adopts the new refrigerant HFC (R32) which does not damage the ozone layer. installation/servicing, be sure to ventilate fully. If the refrigerant gas comes into contact with fire, a The next section describes the precautions for air conditioner using the new refrigerant.
  • Page 11 Table 3-2-1 Thicknesses of annealed copper pipes Thickness (mm) Nominal diameter Outer diameter (mm) R32(R410A) 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 12 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 13 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 14 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 15 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 16 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. 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 17 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 18 4. CONSTRUCTION VIEWS 4-1. Indoor Unit 1053 Front Panel Grille Inlet Air Inlet Air Filter Heat Exchanger Air Outlet Knock Out System Knock Out System 71.5 50 71.5 Wireless remote controller 17.5 Remote controller holder For stud bold ( 6) For stud bold ( 8~ Hanger Outline of indoor unit...
  • Page 19 4-2. Outdoor Unit (RAS-18, 22J2AVSG-E) (Unit : mm) Ø6 hole R5.5 Ø6 hole Ø11x14 hole A detail Drawing (Back leg) Ø 11 x 14 Hole 25 Drain outlet Ø B Detail Drawing (Front leg) (For 8 - 10 anchor bolt) Ø...
  • Page 20 Outdoor-Unit (RAS-24J2AVSG-E) (Unit : mm) 6 hole R5.5 A detail drawing (Back leg) 6 hole 2- 11x14 Hole 11x14 hole 25 Drain outlet (For 8- 10 anchor bolt) B detail drawing (Front leg) FAN-GUARD COVER-PV ViewZ Electrical part Liquid side (Flare 6.35) Gas side...
  • Page 21 5. WIRING DIAGRAM RAS-18J2KVSG-E, RAS-18N4KVSG-E / RAS-18J2AVSG-E - 21 -...
  • Page 22 RAS-B22J2KVSG-E, RAS-B22N4KVSG-E / RAS-22J2AVSG-E - 22 -...
  • Page 23 RAS-B24J2KVSG-E, RAS-B24N4KVSG-E / RAS-24J2AVSG-E - 23 -...
  • Page 24 6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type Specificat DRM-340-30-2 DC280-340V, 42W Fan Motor (for indoor) Room temp. sensor (TA-sensor) 10kΩ at 25°C Heat exchanger temp. sensor (TC-sensor) 10kΩ at 25°C Heat exchanger temp. sensor (TCJ-sensor) 10kΩ at 25°C Louver motor 24BYJ48-ST Output (Rated) 4 phase, DC12V...
  • Page 25 7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram RAS-18J2KVSG-E, RAS-18N4KVSG-E / RAS-18J2AVSG-E RAS-B22J2KVSG-E, RAS-B22N4KVSG-E / RAS-22J2AVSG-E Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Outer dia.
  • Page 26 RAS-B24J2KVSG-E, RAS-B24N4KVSG-E / RAS-24J2AVSG-E 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 Vacuum pump connecting port Thickness : 0.8mm Sectional shape Deoxidized copper pipe of heat insulator...
  • Page 27 7-3. Operation Data <Cooling> Tempeature Model name Standard Heat exchanger Indoor Outdoor Compressor Connecting condition(°C) pipe temp. RAS- pressure fan mode fan mode revolution piping Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 27/19 35/- 18J2KVSG-E 10 to 12 48 to 50 High High 1.0 to 1.1...
  • Page 28 8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit Indoor Unit Control Panel M.C.U Functions Operation Heat Exchanger Sensor Display • Louver Control Timer Temperature Sensor • 3-minute Delay at Restart for Compressor Display • Motor Revolution Control Infrared Rays Signal Receiver Display •...
  • Page 29 8-2. Outdoor Unit (Inverter Assembly) - 29 -...
  • Page 30 9. OPERATION DESCRIPTION 9-1. Outline of Air Conditioner Control • Detection of inverter input current and current release operation This air conditioner is a capacity-variable type air conditioner. Its system can control the speed of • Over-current detection and prevention operation to compressor motor according to load.
  • Page 31 9-2. Operation Description 1. Basic operation ......................32 1. Operation control ....................32 2. Cooling/Heating operation ..................33 3. AUTO operation ....................34 4. DRY operation .......................34 2. Indoor fan motor control ....................35 3. Outdoor fan motor control ..................38 4. Capacity control ......................39 5. Current release control ....................39 6.
  • Page 32 9-2. Operation Description 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 as shown in the below. 2) A signal is sent by ON button of the remote controller.
  • Page 33 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 34 Operation flow and applicable data, etc. Description Item 1) Detects the room temperature (Ta) when 1. Basic 3. AUTO operation operation the operation started. Selection of operation mode 2) Selects an operation mode from Ta in As shown in the following figure, the operation starts by selecting automatically the status of room temperature the left figure.
  • Page 35 Item Operation flow and applicable data, etc. Description 2. Indoor fan <In cooling operation> motor control (This operation controls the fan speed at indoor unit side.) * Symbols The indoor fan (cross flow fan) is operated by the phase- : Ultra High control induction motor.
  • Page 36 Item Operation flow and applicable data, etc. Description 2. Indoor fan motor control (Table 1) Indoor fan air flow rate Fan speed Mode RAS-18J2KVSG-E, RAS-18N4KVSG-E RAS-B22J2KVSG-E, RAS-B22N4KVSG-E level Cooling Heating Cooling Heating Cool Heat Fan speed Air flow rate Fan speed...
  • Page 37 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 38 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 39 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 40 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 41 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 42 Item Operation flow and applicable data, etc. Description 8. Louver control This function controls the air direction of the indoor unit. 1) Louver • The position is automatically controlled according to the operation position mode (COOL/HEAT). • The set louver position is stored in memory by the microcomputer, and the louver returns to the stored position when the next operation is performed.
  • Page 43 Item Operation flow and applicable data, etc. Description 8. Louver control Louver position in heating operation Heating operation/ AUTO (HEAT) Initial setting of “Heating storage position” Louver : Directs downward (79.1°) Wide air direction Wide-angle Right wide Left wide Spot air direction Spot front Spot right Spot left...
  • Page 44 Item Operation flow and applicable data, etc. Description 8. Louver control 2) Wind direction adjustment Air direction • The Up-Down louver position can be Horizontal Inclined Blowing Inclined Horizontal arbitrarily set up by blowing blowing downward blowing blowing pressing [FIX ] button.
  • Page 45 Item Operation flow and applicable data, etc. Description 8. Louver control 3) Swing • Swing operation is perfor in range 35° with the Fixed position as Swing • the center. When pressing [SWING] button during • If the swing range exceeded either upper or lower limit position, operation, the louver swing operation is perfomed in range 35°...
  • Page 46 Item Operation flow and applicable data, etc. Description 9. ECO When pressing [ECO] button on the remote controller, a <Cooling operation> operation Economic operation is performed. 1) The control target temperature <Cooling operation> increase 0.5ºC per hour up to 2ºC This function operates the air conditioner with the difference starting from the set temperature between the set and the room temperature as shown in the...
  • Page 47 Item Operation flow and applicable data, etc. Description 1) When pressing [RESET] button, the 10. Temporary Pressing [RESET] button starts the temporary temporary [AUTO] operation starts. operation operation of [AUTO] operation. When keeping [RESET] button pressed for 10 seconds or more, the 2) When keeping [RESET] button pressed temporary [COOL] operation is performed.
  • Page 48 Item Operation flow and applicable data, etc. Description This function controls throttle amount of the 1) When starting the operation, move the 13. Pulse Modulating refrigerant in the refrigerating cycle. valve once until it fits to the stopper. valve (P.M.V.) (Initialize) According to operating status of the air conditioner, control...
  • Page 49 Item Operation flow and applicable data, etc. Description 14. Self-Cleaning 1. Purpose 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 50 Item Operation flow and applicable data, etc. Description 14. Self-Cleaning function 14-1-1. Self-Cleaning diagram Operation display FCU fan rpm is depend on presetting. (500RPM) FCU louver OPEN OPEN (12.7º) CLOSE ON or OFF ON or OFF Timer display depend on presetting of timer function. depend on presetting of timer function.
  • Page 51 Item Operation flow and applicable data, etc. Description 15. 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 52 Item Operation flow and applicable data, etc. Description 17. QUIET The "Quiet mode" selected from [ FAN ] button; Quiet mode is the system which, control the Mode revolving speed of indoor fan to work - The fan of the indoor unit will be restricted the constantly at lower than speed L.
  • Page 53 Item Operation flow and applicable data,etc Description ] button on the remote controller is 1. Purpose 19. POWER pressed) Selection The function is used when its circuit Mode − Power Selection 75% is 75% of maximum breaker is shared with other electrical current.
  • Page 54 Item Operation flow and applicable data,etc Description Fireplace button on remote controller is pressed. Keep air circulation during other heat 21. Fireplace 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 55 Item Operation flow and applicable data, etc. Description 23. Hi-POWER ([Hi-POWER] button on the remote controller ∗ The Hi-POWER operation will be cancelled Mode is pressed) when press [Hi-POWER] button again. When [Hi-POWER] button is pressed while the indoor unit is in Auto, Cooling or Heating operation, Hi- POWER mark is indicated on the display of the remote controller and the unit operates as follows.
  • Page 56 Item Operation flow and applicable data,etc Description 25. Display lamp brightness control To decrease the display lamp brightness or turn it off. Press and hold for 3 seconds until brightness level ( ) is shown on remote control LCD then release the button. 2.
  • Page 57 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. This function is not set to work when shipped from the factory.
  • Page 58 9-3-2. How to Cancel the Auto Restart Function To cancel auto restart function, proceed as follows : Repeat the setting procedure : the unit receives the signal and beeps three times. The unit will be required to be turned on with the remote controller after the main power supply is turned off. •...
  • Page 59 9-4. Remote control 9-4-1. Remote control and its functions 1 Infrared signal emitter 2 Memory and Preset button ( 3 Start/Stop button ( 4 Mode select button ( AIR FLOW and HADA CARE FLOW button ( 6 Fireplace/8°C button ( 7 ECO button ( 8 Comfort sleep button ( 9 Weekly timer (...
  • Page 60 How to set WEEKLY TIMER 1. Press to enter WEEKLY TIMER setting. Blink 2. Press to select desired day in sequence. The sequence of day symbol appears on the LCD. WEEKLY SUMO TUWETHFRSA (All day) 3. Press to select the program number. ●...
  • Page 61 5. Press to select desired operation. 6. Press to select desired temperature. ● The temperature can be set between 17°C and 30°C. 7. Press to select the desired fan speed. 8. Add operations, if required. ● Press to use 8°C operation. (Notes: Fireplace cannot select and memorize in weekly function) ●...
  • Page 62 Edit Weekly timer program To edit the program after conf rming the weekly timer setting, follow steps 1 - 3 below. 1. Press ● The day of the week and the program number of the current day will be displayed. 2.
  • Page 63 To delete programs The individual program 1. Press ● The day of the week and the program number is displayed. ● Select the day to delete the program. 2. Press to select the program number to be deleted. 3. Press ●...
  • Page 64 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 3. Press Press : Select AUTO, LOW , LOW+ , MED , MED+ , HIGH or Quiet...
  • Page 65 6. Hi-POWER OPERATION To automatically control room temperature and airflow for faster cooling or heating operation (except in DRY and FAN ONLY mode) Press Press : Start and stop the operation 7. ECO OPERATION To automatically control room temperature to save energy (except in DRY and FAN ONLY mode) Press : Start and stop the operation.
  • Page 66 10. POWER-SELECTION OPERATION / SILENT OPERATION (OUTDOOR UNIT) Power-Selection ( This function is used when the circuit breaker is shared with other electrical appliances. It limits the maximum current and power consumption to 100%, 75%, or 50% and can be implemented by POWER-SELECTION.
  • Page 67 11. TIMER OPERATION Set the timer when the air conditioner is operating. Setting the ON Timer Setting the OFF Timer Press : Set the desired Press : Set the desired ON timer. OFF timer. Press : Set the timer. Press : Set the timer.
  • Page 68 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 69 10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units For the rear left, bottom left and left piping Wall Hook Installation plate Cut out a piece of SPACER from indoor unit packaging box, roll it and insert Flat head between the indoor unit and wall to tilt wood screw the indoor unit for better operation.
  • Page 70 10-2. Installation 10-2-1. Optional installation parts Part Parts name Q’ty code Refrigerant piping Liquid side : Ø6.35 mm each Gas side : Ø12.70 mm Pipe insulating material (polyethylene foam, 8 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit> 108 mm 125 mm 28 mm...
  • Page 71 Installation plate × 1 Wireless remote control × 1 Battery × 2 Remote control holder × 1 Toshiba Ultra pure fi lter × 2 Mounting screw × 6 Flat head wood screw × 2 Owner’s Manual × 1 Installation Manual × 1 Screw ×...
  • Page 72 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 73 10-3. Indoor Unit 10-3-2. Cutting a hole and mounting installation 10-3-1. Installation place <Cutting a hole> • A place which provides the spaces around the indoor When installing the refrigerant pipes from the rear. unit as shown in the diagram •...
  • Page 74 10-3-3. How to Connect Remote Controller for <When the installation plate is directly mounted on Wire Operation the wall> 1. Securely fit the installation plate onto the wall by Indoor unit screwing it in the upper and lower parts to hook up the indoor unit.
  • Page 75 10-3-4. Piping and drain hose installation Fix control wire which arrange as shown on figure 6 and 7 to terminal by provided screws (tighten firmly but not over 0.25 N·m <Piping and Drain Hose Forming> (0.03 kgf·m)). Set control wire through gutter way at rear side of remote controller * Since dewing results in a machine trouble, make as shown on f gure 8.
  • Page 76 <Left-hand connection with piping> <How to fix the Drain Cap> 1) Insert hexagon wrench (4 mm) in a center head. Bend the connecting pipe so that it is laid within 43 mm above the wall surface. If the connecting pipe is laid exceeding 43 mm above the wall surface, the indoor unit may unstably be set on the wall.
  • Page 77 10-3-5. Indoor unit fixing 10-3-6. Drainage 1. Pass the pipe through the hole in the wall, and hook 1. Run the drain hose sloped downwards. the indoor unit on the installation plate at the upper hooks. NOTE 2. Swing the indoor unit to right and left to confirm that •...
  • Page 78 10-4. Outdoor Unit 10-4-2. Precautions about installation in Regions with Snowfall and Cold Temperatures 10-4-1. Installation place • Do not use the supplied drain nipple for draining • A place which provides the spaces around the water. Drain the water from all the drain holes directly. outdoor unit as shown in the diagram •...
  • Page 79 Draining the Water 10-4-3. Refrigerant piping connection • Holes are provided on the base plate of the outdoor unit to ensure that the <Flaring> defrost water produced during heating operations is drained off eff ciently. If a centralized drain is required when installing the unit on a balcony or 1.
  • Page 80 <Tightening connection> Evacuating Align the centers of the connecting pipes and tighten After the piping has been connected to the indoor unit, you can the flare nut as far as possible with your fingers . Then perform the air purge together at once. tighten the nut with a spanner and torque wrench as shown in the figure.
  • Page 81 Cap Size (H) Torque Compound pressure gauge Pressure gauge –101 kPa 14~18 N.m H17 - H19 (–76 cmHg) Manifold valve Valve Rod (1.4 to 1.8 kgf·m) Handle Hi 33~42 N.m Handle Lo H22 - H30 (Keep full closed) (3.3 to 4.2 kgf·m) Charge hose Charge hose 8~12 N.m...
  • Page 82 10-5. Electrical works The power supply can be selected to connect to indoor unit or outdoor unit. Choose proper way and connect the power supply and connecting cable by follow the instruction as following. Model RAS-18J2KVSG-E RAS-B22J2KVSG-E RAS-B24J2KVSG-E RAS-18N4KVSG-E RAS-B22N4KVSG-E...
  • Page 83 10-5-2. Power Supply and Connecting Cable Connection In Case of Indoor Unit Connect With 1:1 Outdoor Unit Power Supply Input at Outdoor Unit Terminal Block (Recommend) Indoor Unit Outdoor Unit Connecting cable Stripping length of the Connecting cable connect to 1 2 3 connecting cable Terminal block Terminal block (L N 1 2 3)
  • Page 84 10-5-3. Power supply input Wiring Diagram for 1:1 Outdoor Unit Power supply input at Outdoor unit Terminal Block (Recommend) Indoor Terminal Block CHASSIS INDOOR UNIT OUTDOOR UNIT Outdoor Terminal Block Power supply input CHASSIS EARTH Power supply input at Indoor unit Terminal Block (Optional) Indoor Terminal Block...
  • Page 85 10-5-4. In Case of Indoor Unit Connect With Inverter Multi System (IMS) Power Supply Input at Outdoor Unit Terminal Block Indoor Unit Outdoor Unit Stripping length of the Connecting cable Connecting cable connect to 1 2 3 connecting cable Terminal block 1(L) Terminal block (L N 1 2 3) Earth line...
  • Page 86 10-3. Others Note : 1. Repeat previous step to reset Remote Control to be A. 10-3-1 . Gas leak test 2. Remote Control A have not “A” display. 3. Default setting of Remote Control from factory is A. Check places for indoor unit (Flarenut connection) F ig.
  • Page 87 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 88 CAUTION A high voltage (equivalent to the supply voltage) is also energized to ground through the sensors, PMV and other low-voltage circuits. The sensor leads and other wires are covered with insulated tubes for protection. Nevertheless, care must be taken to ensure that these wires are not pinched.
  • Page 89 K Precautions when inspecting the control section of the outdoor unit NOTE : A large-capacity electrolytic capacitor is used in the outdoor unit controller (inverter). Therefore, if the power supply is turned off, charge (charging voltage DC280 to 380V) remains and discharging takes a lot of time. After turning off the power source, if touching the charging section before discharging, an electrical shock may be caused.
  • Page 90 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 91 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 92 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 93 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 94 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 95 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 96 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status 1. Check installation conditions such as Outdoor P.C. Compressor drive output error. All OFF Flashes after (Relation of voltage, current error is detected packed valve opening, refrigerant board...
  • Page 97 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status The others Compressor does not rotate. All OFF Flashes after 1. Remove connecting lead wire of the (including Because of missed wiring, error is detected compressor, and operate again.
  • Page 98 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status Return signal of the outdoor Indoor unit Flashes when 1. . Check power supply (Rate +10%) The others operates error is detected unit has been sent when...
  • Page 99 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 100 (2) Power is not turned on though Indoor P.C. board is replaced <Confirmation procedure> Turn on power supply. Return the wiring of the power relay is returned to Is it wired as shown in Figure below? Does operation lamp flash? the normal procedure.
  • Page 101 (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 102 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 103 (4) Indoor fan motor automatically starts to rotate by turning on power supply [For DC fan motor] <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 104 (5) Troubleshooting for remote controller <Primary check> Check that A or B selected on the main unit is matched with A or B selected on the remote controller. 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 105 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 106 11-6. How to Check Simple the Main Parts <Check procedure> Gas leakage, Discharge temp. error, disconnection of TS/TC gas leakage sensors (Check code 02, 1C) (Check code 03, 1E) Does this model have P.M.V. or not? Valve drive check Is coil of the pulse motor valve Set it correctly.
  • Page 107 11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized Inner Diagnosis of Inverter Assembly Table 11-7-1 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. Check •...
  • Page 108 Diagnosis/Process flowchart Item Contents Summary Check Check winding resistance between phases of compres- sor, and resistance between outdoor frames by using a tester. → OK if 20MΩ or more • Is it grounded? Replace control board assembly. • Is it short-circuit ...
  • Page 109 (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 110 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 TA, TC, TCJ, TO, TS, TE : Outdoor heat exchanger temp sensor Temperature (°C) - 110 -...
  • Page 111 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. (Normal temp.) Heat exchanger (TC) sensor Heat exchanger (TCJ) sensor Temperature 10°C 20°C 25°C 30°C 40°C Sensor TA, TC, TCJ (kΩ) 20.7 12.6...
  • Page 112 11-8-5. Checking Method for Each Part Part name Checking procedure Electrolytic capacitor 1. Turn OFF the power supply breaker. 2. Discharge all three capacitors completely. 3. Check that safety valve at the bottom of capacitor is not broken. 4. Check that vessel is not swollen or exploded. 5.
  • Page 113 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 114 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 115 Part name Procedures Remarks Air filters 1) Follow to the procedure in the item 1 . Air filters 2) Remove the left and the right air filters from the front panel. Front panel 1) Stop operation of the air conditioner and turn Front panel Air inlet grille off its main power supply.
  • Page 116 Part name Procedures Remarks Electric part 1) Follow the procedure item 3 . box assembly 2) Remove screw holding the electric part cover. TA sensor Connectors Fan motor connector Earth line TCJ sensor Louver motor connector (22K, 24K) TC sensor Screw Electric part cover Louver motor (L)
  • Page 117 Part name Procedures Remarks Fan motor 1) Follow the procedure item 3 and 4 . Cross flow fan 2) Loosen the set screw of the cross flow fan. Cross flow fan Body back 3.5 mm Set screw Fan motor Vertical louver Hexagon screw driver 3) Remove 2 fixing screws of the motor band.
  • Page 118 Remarks 1) Follow the procedure item Drain pan 2) Remove screw holding the electric part assembly cover. 3) Disconnect the louver motor connector (5P) from P.C. board assembly. 4) Disconnect the cord motor of Louver VT (5P) from the Louver VT (L/R) connector. 5) Disconnect the cord motor of Louver motor Connectors (L) (5P) from the Louver motor (L) connector.
  • Page 119 Part name Procedures Remarks Vertical louver 1) Follow the procedure item 3 and 8 . Vertical louver assembly 2) Remove 2 fixing screws from the base Screw vertical louver then remove the vertical louver assembly from the body back. Screw Cover motor VT 1) Follow the procedure item 3 , 8 and 9 .
  • Page 120 Part name Remarks Procedures Cross flow fan Body back 3.5 mm Fan motor Set screw - Holding the set screw, install the cross flow fan so that flat area on shaft of the fan motor comes to the mounting hole of the set screw.
  • Page 121 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 122 12-2. Outdoor unit (RAS-18, 22J2AVSG-E) Remarks Part name Procedures Common procedure 1. Detachment Upper cabinet 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 123 Part name Procedures Remarks Inverter assembly 1) Perform work of item 1 in 1. Inverter cover 2) Remove screw (ST2TØ4 × 10L 2 pcs.) of the upper part of the front cabinet. P.C. board • If removing the inverter cover in this (Soldered surface) condition, P.C.
  • Page 124 Part name Procedure Remarks Control board 1. Disconnect the leads and connectors connected to assembly the other parts from the control board assembly. CN601 CN703 CN602 CN600 CN603 1) Leads • 3 leads (black, white, orange) connected to terminal block. •...
  • Page 125 Part name Procedures Remarks Side cabinet 1. Side cabinet (right) 1) Perform step 1 in 2 and all the steps in 3. 2) Remove the fixing screw (ST2TØ4 × 10L 4 pcs.) used for securing the side cabinet to the bottom plate and valve fixing panel 2.
  • Page 126 Part name Procedures Remarks Compressor 1) Perform work of item 1 of 1 and 2, 3, 4, 5. 2) Extract refrigerant gas. 3) Remove the partition board. (ST2TØ4 × 10L 3 pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, and disconnect lead wire of the compressor from Compressor the terminal.
  • Page 127 Part name Procedures Remarks Electronic expansion 1. Detachment valve coil 1) Perform step 1 in 2, all the steps in 3 and 1 in 5. 2) Remove the coil by pulling it up from the electronic control valve body. 2. Attachment 1) When assembling the coil into the valve body, ensure that the coil anti-turn lock is installed properly in the pipe.
  • Page 128 Part name Remarks Procedures TE sensor (outdoor heat exchanging temperature sensor) " • Attachment Install the sensor onto the straight pipe part of the condenser output pipe. 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.
  • Page 129 12-3. Outdoor Unit (RAS-24J2AVSG-E) 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 130 Part name Procedure Remarks 1. Detachment Front cabinet ‚ 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 131 Part name Procedure Remarks Inverter 1) Perform work of item 1 in  ƒ Inverter cover assembly 2) Remove screw (ST2TØ4 × 10L 2 pcs.) of the P.C. board upper part of the front cabinet. (Soldered surface) • If removing the inverter cover in this condition, P .C.
  • Page 132 Part name Procedure Remarks Control board 1. Disconnect the leads and connectors connected to assembly the other parts from the control board assembly. CN602 CN600 CN603 CN601 CN703 1) Leads • 3 leads (black, white, orange) connected to terminal block. •...
  • Page 133 Part name Procedure Remarks 1. Side cabinet (right) Side cabinet … 1) Perform step 1 in and all the steps in ‚ ƒ 2) Remove the fixing screw (ST2TØ4 × 10L 3 pcs.) used for securing the side cabinet to the bottom plate and valve fixing panel.
  • Page 134 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 135 Part name Procedure Remarks 1. Detachment Electronic ‰ expansion valve 1) Perform step 1 in 2, all the steps in 3 and coil 1 in 5. 2) Remove the coil by pulling it up from the electronic control valve body. 2.
  • Page 136 Part name Remarks Procedures TE sensor (outdoor heat exchanging temperature sensor) " • Attachment Install the sensor onto the straight pipe part of the condenser output pipe. 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.
  • Page 137 FRONT PANEL ASSY 43T39381 MOTOR BAND BACK (FOR RAS-18,B22J2KVSG-E/N4KVSG-E) 43T39382 MOTOR BAND FRONT 43T00779 FRONT PANEL ASSY 43T44664 REFRIGERATION CYCLE ASSY (FOR RAS-18J2KVSG-E/N4KVSG-E) (FOR RAS-B24J2KVSG-E/N4KVSG-E) 43T00715 CAP SCREW 43T44665 REFRIGERATION CYCLE ASSY 43T09586 GRILLE OF AIR INLET ASSY (FOR RAS-B22J2KVSG-E/N4KVSG-E) 43T80358...
  • Page 138 PC BOARD ASSY 43T6V673 TERMINAL(5P-TF) (FOR RAS-B22J2KVSG-E/N4KVSG-E) 43T50392 SENSOR,THERMOSTAT 43T6W724 PC BOARD ASSY CORD-CLAMP 43T62340 (FOR RAS-B24J2KVSG-E//N4KVSG-E) PC BOARD ASSY : WRS-LED 43T6W727 43T60502 HOUSING-WiFi 43T6W721 PC BOARD ASSY 43T50306 TEMPERATURE SENSOR (FOR RAS-18J2KVSG-E/N4KVSG-E) (FOR RAS-B22, B24J2KVSG-E/N4KVSG-E) - 138 -...
  • Page 139 13-3. Outdoor Unit RAS-18, 22J2AVSG-E 37,41 36,40 Location Part Location Part Description Description 43T42327 BASE PLATE ASSEMBLY 43T46435 VALVE; PACKED 6.35 DIA 43T00459 LEFT CABINET 43T46461 VALVE; PACKED 12.7 DIA 43T00690 RIGHT CABINET ASSEMBLY 43T46469 BODY PMV 43T00735 UPPER CABINET ASSEMBLY 43T63360 COIL PMV 43T00688...
  • Page 140 13-4. Outdoor Unit RAS-24J2AVSG-E 37,41 36,40 Location Part Location Part Description Description 43T42345 BASE PLATE ASSEMBLY 43T46435 VALVE; PACKED 6.35 DIA 43T00560 LEFT CABINET 43T46507 VALVE; PACKED 12.7 DIA 43T00719 RIGHT SIDE CABINET ASSEMBLY 43T46469 BODY PMV 43T00561 UPPER CABINET 43T63360 COIL PMV 43T00774...
  • Page 141 13-5. Outdoor Unit (Part-E) RAS-18, 22J2AVSG-E TO-SENSOR TE-SENSOR TD-SENSOR TS-SENSOR 710 HOLDER-SENSOR (TE) 711 HOLDER-SENSOR (TS) 712 HOLDER-SENSOR (TD) Location Part Location Part Description Description 43T62351 HEATSINK 43T50352 TEMPERATURE SENSOR 43T6W708 PC BOARD ASSY 43T50360 TC-SENSOR(TO) (FOR RAS-18J2AVSG-E) 43T6W709 PC BOARD ASSY 43T62313 PC PLATE BASE (FOR RAS-22J2AVSG-E)
  • Page 142 13-6. Outdoor Unit (Part-E) RAS-24J2AVSG-E TO-SENSOR TE-SENSOR TD-SENSOR TS-SENSOR 710 HOLDER-SENSOR (TE) 711 HOLDER-SENSOR (TS) 712 HOLDER-SENSOR (TD) Location Part Location Part Description Description 43T67310 HEATSINK 43T50352 TEMPERATURE SENSOR 43T6W710 PC BOARD ASSY 43T50360 TC-SENSOR(TO) 43T60392 TERMINAL-5P 43T62313 PC PLATE BASE 43T60326 FUSE 43T63318...
  • Page 143 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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