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Toshiba RAS-2M21U2ACVG-SG Service Manual
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Toshiba RAS-2M21U2ACVG-SG Service Manual

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FILE NO. SVM-19118
SERVICE MANUAL
AIR-CONDITIONER
MULTI TYPE
RAS-2M21U2ACVG-SG
RAS-3M31U2ACVG-SG
RAS-3M41U2ACVG-SG
R32
December 2019

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Summary of Contents for Toshiba RAS-2M21U2ACVG-SG

  • Page 1 FILE NO. SVM-19118 SERVICE MANUAL AIR-CONDITIONER MULTI TYPE RAS-2M21U2ACVG-SG RAS-3M31U2ACVG-SG RAS-3M41U2ACVG-SG December 2019...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ............3 2. SPECIFICATIONS ..............10 3. REFRIGERANT R32 ..............16 4. CONSTRUCTION VIEWS ............24 5. WIRING DIAGRAM ..............25 6. SPECIFICATIONS OF ELECTRICAL PARTS......27 7. REFRIGERANT CYCLE DIAGRAM........... 28 8. CONTROL BLOCK DIAGRAM ..........32 9.

  • Page 3: Safety Precautions

    1. 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 illustrated marks] Mark Explanation...
  • Page 4 For general public use Power supply cord of parts of appliance for outdoor use shall be at least polychloroprene sheathed flexible cord (design H07RN-F) or cord designation 60245 IEC66 (1.5 mm² or more). (Shall be installed in accordance with national wiring regulations.) This appliance is not intended for use by person (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for...
  • Page 5 DANGER • THE MANUFACTURER SHALL NOT ASSUME ANY LIABILITY FOR THE DAMAGE CAUSED BY NOT OBSERVING THE DESCRIPTION OF THIS MANUAL. • FOR USE BY QUALIFIED PERSONS ONLY. • MEANS FOR DISCONNECTION FROM THE SUPPLY HAVING A CONTACT SEPARATION OF AT LEAST 3 MM IN ALL POLES MUST BE INCORPORATED IN THE FIXED WIRING.
  • Page 6 WARNING About the refrigerant • This product contains fluorinated greenhouse gases. • Do not vent gases to the atmosphere. • The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater). •...
  • Page 7 WARNING • Do not use any refrigerant different from the one specified for complement or replacement. Otherwise, abnormally high pressure may be generated in the refrigeration cycle, which may result in a failure or explosion of the product or an injury to your body. •...
  • Page 8 WARNING • Installation work must be performed following the instructions in this installation manual. Improper installation may cause water leakage, electrical shock or fire. Check the following items before operating the unit. - Be sure that the pipe connection is well placed and there are no leaks. - Check that the service valve is open.
  • Page 9 CAUTION • Please read this installation manual carefully before installing the unit. It contains further important instructions for proper installation. • Exposure of unit to water or other moisture before installation could result in electric shock. Do not store it in a wet basement or expose to rain or water. •...

  • Page 10: Specifications

    A 1-room connection is not an option for the indoor units (you cannot connect only one indoor unit). Be sure to connect indoor unit in two or more. 2-1.Specifications <Cooling only models> RAS-2M21U2ACVG-SG, RAS-3M31U2ACVG-SG and RAS-3M41U2ACVG-SG Unit models Outdoor units RAS-2M21U2ACVG-SG...
  • Page 11 2-2. Performance with Indoor unit maximum combination RAS-2M21U2ACVG-SG Operation mode ： Cooling Current limit ： none, 11.0A and 8.5A Power supply voltage： 220V Indoor unit Unit capacity Cooling capacity (kW) Power consumption (W) Operating current (A) Rated Operating status ΣkBTU...
  • Page 12 RAS-3M31U2ACVG-SG Operation mode ： Cooling Current limit ： none and 11.0A Power supply voltage： 220V Indoor unit Unit capacity Cooling capacity (kW) Power consumption (W) Operating current (A) Rated Operating status ΣkBTU Rated Rated Rated 3 Units 2.00 2.00 2.00 1235 2055 2.45...
  • Page 13 RAS-3M41U2ACVG-SG Operation mode ： Cooling Current limit : none, 11.0A and 8.5A 220V Power supply voltage： Indoor unit Unit capacity Cooling capacity (kW) Power consumption (W) Operating current (A) Operating status ΣkBTU Rated Rated Rated Rated 3 Units 1.44 1.43 1.43 2.15 4.30...
  • Page 14 2-2-1. Operation Characteristic Curve <Cooling> RAS-2M21U2ACVG-SG 15.0 Condition Indoor side : Db27 C/Wb19 12.0 Indoor unit operating : 2 units Indoor unit airflow : High Length of connecting pipe : 5m x 2 220V 230V 240V Compressor revolution speed (rps) RAS-3M31U2ACVG-SG 15.0...
  • Page 15 2-2-2. Capacity Variation Ratio According to outdoor Temperature <Cooling> RAS-2M21U2ACVG-SG, RAS-3M31U2ACVG-SG and RAS-3M41U2ACVG-SG Condition Indoor side : Db27 C / Wb19 Outdoor side : Db35 C / Wb24 Indoor unit airflow : High Connecting pipe lenght for each Indoor unit : 5m.

  • Page 16: Refrigerant R32

    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 17 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 18 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 19 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 20 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 21 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 22 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 23 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 24: Construction Views

    4. CONSTRUCTION VIEWS Outdoor Unit - 24 -...

  • Page 25: Wiring Diagram

    5. WIRING DIAGRAM Outdoor Unit RAS-2M21U2ACVG-SG t° t° t° t° t° t° - 25 -...
  • Page 26 Outdoor Unit RAS-3M31U2ACVG-SG RAS-3M41U2ACVG-SG 1.For D800 D805 and SW01 SW02, refer to the installation and service manual. REACTOR CN01(WHI) MCC-1646 Display P.C. Board t° t° t° t° t° t° t° HIGH PRESSURE SWITCH P< THERMOSTAT COMPRESSOR 4WAY VALVE COIL t°> REACTOR POWER SUPPLY...

  • Page 27: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS Outdoor Unit Parts name Model name Rating Compressor DX136A1T-40N 3-Phases (4-Poles);1100W 2M21,3M41 series 3M31 series DX151A1T-30N 3-Phases (4-Poles);1100W Outdoor fan motor ICF-340-A70-1 Output 70W Reactor CH-57-WL 10mH、16A Reactor CH-76-VK 9.9mH、1A PMV coil DC12V PQ-M10012-000313 P.C. board(Main PCB) MCC-1645 AC220-240V DC 5V...

  • Page 28: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram RAS-2M21U2ACVG-SG Temp. measurement Indoor unit A B room B room Evaporator Cross flow fan Per 1 unit Max. : 20m Connecting pipe Connecting pipe Min. : 2m Thickness : 0.8mm Thickness : 0.8mm dia.9.52...
  • Page 29 RAS-3M31U2ACVG-SG Temp. measurement Indoor unit A C room B room C room B room Evaporator Cross flow fan Per 1 unit Max. : 25m Connecting pipe Min. : 2m Connecting pipe Thickness : 0.8mm Thickness : 0.8mm Total dia.6.35 dia.9.52 Max.
  • Page 30 RAS-3M41U2ACVG-SG Temp. measurement Indoor unit A C room B room C room B room Evaporator Cross flow fan Per 1 unit Max. : 25m Connecting pipe Min. : 2m Connecting pipe Thickness : 0.8mm Thickness : 0.8mm Total dia.6.35 dia.9.52 Max.
  • Page 31 7-2. Operation Data Outdoor Unit ：RAS-2M21U2ACVG-SG <Cooling> Temperature Standard Heat exchanger Compressor No.of Indoor unit Indoor condition pressure pipe temperature revolution operating units Indoor Outdoor T1(℃) T2(℃) P（MPa） （rps） 0.8 to 1.0 12 to 14 38 to 44 High 19.0 1 unit 0.8 to 1.0...

  • Page 32: Control Block Diagram

    8. CONTROL BLOCK DIAGRAM Outdoor Unit (Inverter Assembly) RAS-2M21U2ACVG-SG Outdoor temp. sensor Gas side pipe temp. sensor Discharge temp. sensor MCC-1665 (Control P.C.B) A unit P.M.V. M.C.U. Driver A unit Serial Signal circuit ・Inverter outdoor frequency control Communication B unit P.M.V.
  • Page 33 Outdoor Unit (Inverter Assembly) RAS-3M31U2ACVG-SG RAS-3M41U2ACVG-SG Outdoor temp. sensor Gas side pipe temp. sensor Discharge temp. sensor MCC-1665 (Control P.C.B) A unit P.M.V. M.C.U Driver A unit Serial Signal ・Inverter outdoor frequency control circuit Communication B unit P.M.V. ・A/D converter function circuit ・P.M.V control P.M.V．...

  • Page 34: Operation Description

    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 • Over-current detection and prevention operation conditioner. Its system can control the speed of to IGBT module (Compressor stop function) compressor motor according to load.
  • Page 35 9-2. Operation Description 1. Basic operation ........................36 1. Operation control ....................... 36 2. Outdoor fan motor control ....................... 37 3. Capacity control ........................38 Current release control ......................38 5. Compressor protective control ....................38 6. Discharge temperature control ....................39 7.

  • Page 36: Basic Operation

    Item Operation flow and applicable data, etc. Description 1. Operation control 1. Basic 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 37: Outdoor Fan Motor Control

    Item Operation flow and applicable data, etc. Description 2. 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 indoor processed by the indoor unit unit, the controller of outdoor unit controls fan speed.

  • Page 38: Capacity Control

    3) The compressor operation range in each operating mode is shown in the left table. Outdoor unit Indoor unit A Indoor unit B Inverter Compressor Indoor unit C RAS-2M21U2ACVG-SG RAS-3M31U2ACVG-SG RAS-3M41U2ACVG-SG Operation No.of Combination Compressor Combination...

  • Page 39: Discharge Temperature Control

    Item Operation flow and applicable data, etc. Description 1. Purpose 6. Discharge temperature This function detects error on the control refrigerating cycle or error on the compressor, and performs protective control. Td value Control operation 2. Operation Judges as an error and stops the compressor. 120°C •...

  • Page 40: Service Switch (Sw01, Sw0 ) Operation

    9-3. Service switch (SW01, SW02) operations Various displays and various operations are enabled by push buttons (service) switches and LED on the outdoor control P.C. board. 9-3-1. LED display 5 patterns are provided for LED display. ○:ON (○*:3 sec ON/0.5 sec OFF), ●:OFF, ◎:Rapid Flashing(5 times/sec), ◇:Slow Flashing(1 time/sec) D800 D801 D802...
  • Page 41 9-3-2. Service switch setting and service support function You can choose service switch setting and service support function. Operating method is as below. Turn on the circuit breaker Push SW01 & 02 at the same time for 5 sec or more Initial status D800 D801...
  • Page 42 [Confirmation method of various settings] You can confirm that various settings are validated. 1) Check LED displays are in the initial status. If it are not so, return them to the initial status. 2) Push and hold SW01 for 5 seconds or more. D804 changes to slow flashing. 3) Push SW01 several times and then stop it at the point where LED display (D800 to D804) to be checked.
  • Page 43 9-3-4. Service support function Various displays are available by setting service switches. [Operating method] 1) Check LED display is the initial status. If it is not so, set the initial status. 2) Push SW01 several times and stop it at the item that you want to check. ○:ON (○*:3 sec ON/0.5 sec OFF)●:OFF Display ◎:Rapid Flashing(5 times/sec) ◇:Slow Flashing(1 time /sec)
  • Page 44 3) Pushing SW02, the display changes to next item. To see other display contents, repeat that. 4) To finish LED display, be sure to execute item 1) to return LED to the initial status (error display of current occurrence) and then finish LED display. [Error display] The error which is occurring at present and the latest error (including error that is occurring now) can be confirmed by checking display on the outdoor control P.C.
  • Page 45 C. Sensor, current, compressor operation frequency, PMV opening, Miswiring (mispiping) check display Using the service display function, you can check a variety of information. ○:ON (○*:3 sec ON/0.5 sec OFF)●:OFF ◎:Rapid Flashing(5 times/sec) ◇:Slow Flashing(1 time /sec) display Contents D800 D801 D802 D803 D804 D805 Temp.
  • Page 46 9-3-5. How to set the SERVICE SWITCH SETTING. If you want to set the "POWER SAVE SETTING OFF ⇒ ON (8.5A) " . ○:ON, ●:OFF, ◎:Rapid Flashing(5 times/sec), ◇:Slow Flashing(1 time/sec) Turn on the circuit breaker Initial status D800 D801 D802 D803 D804...
  • Page 47 9-3-6. How to set the SERVICE SUPPORT FUNCTION. If you want to check the "COMPRESSOR FREQUENCY" . ○:ON, ●:OFF, ◎:Rapid Flashing(5 times/sec), ◇:Slow Flashing(1 time/sec) Turn on the circuit breaker Initial status D800 D801 D802 D803 D804 D805 (Yellow) (Yellow) (Yellow) (Yellow) (Yellow)

  • Page 48: Installation Procedure

    • New tools for R32 (R410A) New tools for Applicable to R22 model Changes R32 (R410A) As pressure is high, it is impossible to measure by means of × Gauge manifold conventional gauge. In order to prevent any other refrigerant from being charged, each port diameter has been changed.
  • Page 49 6.35, 9.52 mm 6.35, 9.52 mm Unit A 10 or 13 or 18 6.35, 9.52 mm 6.35, 12.7 mm 36 (RAS-2M21U2ACVG-SG) Total — 41 (RAS-3M31U2ACVG-SG) 41 (RAS-3M41U2ACVG-SG) All combinations that do not exceed the “Total” number can be installed. 2 or more indoor units must be connected to an outdoor unit.
  • Page 50 10-2-5. Installation Fixing the Outdoor Unit Fix the outdoor unit using attachment bolts. Installation Location ■ • Use 8 mm or 10 mm anchor bolts and nuts. • Do not allow the attachment bolts to protrude by more than 15 mm. •...
  • Page 51 10-2-6. Refrigerant piping Pipe connection 1. Make wire and pipe connections for each indoor unit separately. 2. Align the centres of the connecting pipes and tighten the fl are nut as much CAUTION as possible with your fi ngers, then tighten the nut using a torque wrench. Be sure to tighten the nut at the specifi...
  • Page 52 Insulation of the Refrigerant Pipes Air Purge ■ ■ From the sake of environmental protection, use a vacuum pump to extract • Insulate the refrigerant pipes for liquid and gas separately. the air during installation. * Prepare a 4 mm hexagon wrench. 1.
  • Page 53 Unit B Earth • Connect the indoor/outdoor connecting cables to the identical terminal numbers on the terminal block of each unit. • Incorrect connection may cause a failure. RAS-3M31U2ACVG-SG, Model RAS-2M21U2ACVG-SG RAS-3M41U2ACVG-SG Power supply 1ph, 50Hz, 220-240V Maximum running 11.2A 11.5A...
  • Page 54 Important instruction To all installers Please be reminded that all air conditioners installed at HDB flats are subjected to a current restriction of 11A or 8.5A. It is the installer’s responsibility to have to current release control set correctly for the type of HDB flat which the IMS unit is installed. The setting method is the following.
  • Page 55 10-2-8. Grounding The below is displayed when the error is detected. (* Repetition of 3 sec ON / 0.5 sec OFF) This air conditioner must be grounded without fail. D800 D801 D802 D803 D804 D805 • Grounding is necessary not only to safeguard against the possibility * * *...
  • Page 56 10-2-10. Pump-down Operation 4. Hold down SW01 for at least 5 seconds, and check that D800 is lighted and D804 light is fl ashing ( 1 time/sec.). Pump-down Operation (Recovering refrigerant) ■ D800 D801 D802 D803 D804 D805   ...

  • Page 57: How To Diagnose The Trouble

    11. HOW TO DIAGNOSE THE TROUBLE The pulse modulating 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...
  • Page 58 11-1. First Confirmation 11-1-3. Operation Which is not a Trouble (Program Operation) 11-1-1. Confirmation of Power Supply For controlling the air conditioner, the program Confirm that the power breaker operates (ON) operations are built in the microcomputer as normally. described in the following table. If a claim is made for running operation, check 11-1-2.
  • Page 59 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. For any trouble occurred at the outdoor unit side, detailed diagnosis is possible by 6-serial LED on the Display P.C.
  • Page 60 11-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to E in Table 11-3-1, 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 information of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 61 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 62 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 63 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Outdoor Current on inverter circuit All OFF Flashes after 1. Remove connecting lead wire of the is over limit in short time. error is detected compressor, and operate again.
  • Page 64 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 Compressor drive output error. All OFF Flashes after Outdoor (Relation of voltage, current error is detected packed valve opening, refrigerant 8 times*.
  • Page 65 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 66 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 67 11-5. Judgment of Trouble by Symptom 11-5-1. Wiring Failure (Interconnecting and Serial Signal Wire) (1) Outdoor unit does not operate 1) Is the voltage between of the indoor terminal block varied? 2) Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the following diagram.
  • Page 68 Service Support Function (LED Display, Switch Operation) 1. Outline A various setup and operation check can be performed by the pushdown button switches (SW01,02) on the outdoor P.C. board(Display PCB). Operation part and Display part on MCC-1646 (Display PCB) Part No. Specifications Operation contents Performs the specific operation to check maintenance and...
  • Page 69 11-6. Trouble Diagnosis by Outdoor LED For the outdoor unit, the self-diagnosis is possible by LED (Green) and five LEDs (Yellow). Green LED (D805) and Yellow LEDs (D800 to D804) are provided on the display P.C. board MCC-1646. 1. In the initial LED display status, Green LED(D805) is lighted as below. Normal Error occurring D800...
  • Page 70 :ON ( *:3 sec ON / 0.5 sec OFF) :OFF Check Outdoor Check and troubleshooting code LED display (Item without special mention indicates part of outdoor unit.) [1C]  [Case thermo operation, Power supply error ] Is AC mains voltage correct? Confirm power supply (198 to 264V) construction.
  • Page 71 :ON ( *:3 sec ON / 0.5 sec OFF) :OFF Check Outdoor Check and troubleshooting code LED display (Item without special mention indicates part of outdoor unit.) * *  [19] [Discharge temp. sensor (TD) error] Is connection of CN600 Correct connector.
  • Page 72 :ON ( *:3 sec ON / 0.5 sec OFF) :OFF Check Outdoor Check and troubleshooting code LED display (Item without special mention indicates part of outdoor unit.) [1C] ∗ There is a possibility that it is one of the following errors. Confirm LED on display P.C.
  • Page 73 :ON ( *:3 sec ON / 0.5 sec OFF) :OFF Check Outdoor Check and troubleshooting code LED display (Item without special mention indicates part of outdoor unit.)  * [1C] [A room gas side temp. sensor (TGa) error] (Continued) Is connection of CN604 Correct connector.
  • Page 74 :ON ( *:3 sec ON / 0.5 sec OFF) :OFF Check Outdoor Check and troubleshooting code LED display (Item without special mention indicates part of outdoor unit.)  [1E]   *  [Discharge temp. error] Is there gas leak? Repair defective position.
  • Page 75 :ON ( *:3 sec ON / 0.5 sec OFF) :OFF Check Outdoor Check and troubleshooting code LED display (Item without special mention indicates part of outdoor unit.) [20] ∗ There is a possibility that it is one of the following errors. Confirm LED on display P.C.
  • Page 76 :ON ( *:3 sec ON / 0.5 sec OFF) :OFF Check Outdoor Check and troubleshooting code LED display (Item without special mention indicates part of outdoor unit.) ∗ There is a possibility that it is one of the following errors. [21] Confirm LED on display P.C.
  • Page 77 11-7. Inspection of the Main Parts [1] Sensor characteristic table : Discharge temp. sensor : Outdoor temp. sensor TGa to TGc : Gas side temp. sensor TO, TGa to TGc Temperature (˚C) 11-8. Outdoor Unit Part name Checking procedure Compressor Measure the resistance value of each winding by using the tester.
  • Page 78 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 79: How To Replace The Main Parts

    12. HOW TO REPLACE THE MAIN PARTS 12-1. Outdoor Unit No. Part name Procedure Remarks ① Common procedure Never forget to put on the gloves at working time; otherwise an injury will be caused by the parts etc. 1.Detachment 1) Stop operation of the air conditioner, and turn off the main switch of the breaker for air conditioner.
  • Page 80 No. Part name Procedure Remarks ② Front 1.Detachment Motor base cabinet 1) Perform work 1 of ①. Inverter cover 2) Remove the front cabinet. (ST1TØ4×10L 2pcs. : fix to motor base) (ST1TØ4×10L 1pc. : fix to inverter cover) (ST1TØ4×10L 4pcs. : fix to base plate) •...
  • Page 81 No. Part name Procedure Remarks Inverter 1) Perform works 1 of ① and ②. ③ assembly Never disassemble the inverter until 1minute after the power supply was turned off because there is a fear that an electric shock may occur. 2) Remove screws.
  • Page 82 No. Part name Procedure Remarks ③ Inverter 10) Disconnect the leads connected to the other assembly parts from the P.C. assembly. (continued) These connectors have the lock. The lock must be released before they are disconnected. Main P.C. board CN300 : Outdoor fan motor (3P : white) CN500 : Thermostat for compressor (2P : blue) CN501 : High pressure switch (3P : green) Control P.C.
  • Page 83 No. Part name Procedure Remarks ④ Side cabinet 1.Side cabinet (right) 1) Perform works 1 of ① and ②. 2) Remove screws. (ST1TØ4×10L 2pcs. : fix to inverter assembly) (ST1TØ4×10L 4pcs. : fix to valve plate) (ST1TØ4×10L 2pcs. : fix to base plate) 2.Side cabinet (left) 1) Perform works 1 of ①...
  • Page 84 No. Part name Procedure Remarks ⑥ Compressor 1) Perform works from ① to ⑤. 2) Recover the refrigerant gas form the outdoor unit. 3) Remove partition. (ST1TØ4×10L 5pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, and disconnect lead wire of the compressor and the comp.
  • Page 85 No. Part name Procedure Remarks ⑧ PMV coil 1. Detachment 1) Perform step 1 in 2 , all the steps in 3 and 1 in 4 . 2) Turn the coil by 180 degrees then remove by pull it upward. 1) Insert the coil at position which perpendicular with pipe of PMV then turn the coil by 180 degrees.
  • Page 86 No. Part name Procedure Remarks TD sensor (Discharge pipe temperature sensor) ⑩ • Attachment With its leads pointed in the direction shown in the figure, install the sensor facing downward onto the vertical straight pipe part of the discharge pipe. ⑪...
  • Page 87 No. Part name Procedure Remarks High pressure 1.Detachment ⑬ switch 1) Perform work of ①. 2) Recover the refrigerant gas form the outdoor unit. 3) Perform work of ②, ③, ④ and ⑤. 4) Remove the sound-insulation material and partition. 5) Remove the high pressure switch by the burner.

  • Page 88: Exploded Views And Parts List

    GENERAL ASSY PLATE FIXING 43T20331 PROPELLER FAN (FOR RAS-3M41U2ACVG-SG) 43T19350 HANDLE 43T45313 GENERAL ASSY PLATE FIXING 43T00673 PACKED VALVE COVER ASSEMBLY (FOR RAS-2M21U2ACVG-SG) 43T63376 HOLDER, SENSOR 43T45314 GENERAL ASSY PLATE FIXING 43T19351 FIN GUARD (FOR RAS-3M31U2ACVG-SG) 43T43583 CONDENSER ASSEMBLY 43T58327...
  • Page 89 13-2. Inverter Assembly RAS-2M21U2ACVG-SG, RAS-3M31U2ACVG-SG BASE-PLATE-PC ASM-L-PCB (CDB) MCC-1645 ASM-L-PCB (CDB) MCC-1665 FUSE (6.3A) FUSE(6.3A) FUSE-HOLDER FUSE-HOLDER ASM-PCB-SERV(DS) MCC-1646 ASM-PCB-SERV(DS (MCC-1646) ASM-BASE-PL-SUB HEATSINK HOLDER-SENSOR(TGA) SERV-TERMINAL (6P) SERV-TERMINAL (6P) HOLDER-SENSOR(TGB) SERV-TERMINAL(3P) REACTOR HOLDER-SENSOR(TD) TUBE TC-SENSOR (TO) SENSOR-TEMP (TGA,TGB) SENSOR-TEMP(TGA,TGB) SENSOR (TD)
  • Page 90 RAS-3M41U2ACVG-SG BASE-PLATE-PC BASE-PLATE-PC ASM-L-PCB (CDB) MCC-1645 ASM-L-PCB (CDB)MCC-1645) ASM-L-PCB (CDB)MCC-1665 FUSE (6.3A) FUSE(6.3A) FUSE-HOLDER FUSE-HOLDER ASM-PCB-SERV(DS) MCC-1646 ASM-PCB-SERV(DS (MCC-1646) HEATSINK ASM-BASE-PL-SUB SERV-TERMINAL (6P) REACTOR 719 HOLDER-SENSOR(TD) TUBE TC-SENSOR (TO) SENSOR-TEMP(TGA,TGB,TGC) SENSOR (TD) Location Part Location Part Description Description 43T6W473 ASM-L-PCB 43T50360 TC-SENSOR(TO) 43T6W474...
  • Page 91 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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