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Toshiba RAS-2M18G3AVG-TR Service Manual
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Toshiba RAS-2M18G3AVG-TR Service Manual

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FILE NO. SVM-22113
SERVICE MANUAL
AIR-CONDITIONER
SPLIT TYPE
RAS-2M18G3AVG-E
RAS-3M18G3AVG-E
RAS-2M18G3AVG-TR
RAS-3M18G3AVG-TR
R32
November, 2022

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Summary of Contents for Toshiba RAS-2M18G3AVG-TR

  • Page 1 FILE NO. SVM-22113 SERVICE MANUAL AIR-CONDITIONER SPLIT TYPE RAS-2M18G3AVG-E RAS-3M18G3AVG-E RAS-2M18G3AVG-TR RAS-3M18G3AVG-TR November, 2022...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ............2. SPECIFICATIONS ..............3. REFRIGERANT R32 ..............4. CONSTRUCTION VIEWS ............5. WIRING DIAGRAM ..............6. SPECIFICATIONS OF ELECTRICAL PARTS......7. REFRIGERANT CYCLE DIAGRAM........... 8. CONTROL BLOCK DIAGRAM ..........9. OPERATION DESCRIPTION ............ 10. INSTALLATION PROCEDURE ..........11.

  • 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 indications] Indication Explanation...
  • Page 4 CAUTION New Refrigerant Air Conditioner Installation • THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R32 WHICH DOES NOT DESTROY OZONE LAYER. R32 refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because the working pressure of R32 refrigerant is approx.
  • Page 5 WARNING • Never modify this unit by removing any of the safety guards or bypassing any of the safety interlock switches. • Do not install in a place which cannot bear the weight of the unit. Personal injury and property damage can result if the unit falls.
  • Page 6 CAUTION • Exposure of unit to water or other moisture before installation may result in an electrical short. Do not store in a wet basement or expose to rain or water. • Do not install in a place that can increase the vibration of the unit. Do not install in a place that can amplify the noise level of the unit or where noise or discharged air might disturb neighbors.

  • Page 7: Specifications

    2. SPECIFICATIONS The indoor and outdoor units that can be used in combination are shown in the tables below. Table of models that can be used in combination Type Outdoor unit Combinations of indoor unit models that can be connected Heat pump RAS-2M18G3AVG-E,-TR Refer to page 9 to 10...
  • Page 8 RAS-3M18G3AVG-E,-TR Unit model Outdoor RAS- 3M18G3AVG-E,-TR Connection indoor unit of this specification RAS- B16G3KVSG-E,-TR + B10G3KVSG-E,-TR (×2) Cooling Capacity (*1) (kW) Cooling Capacity range (kW) 2.0 to 7.50 * Heating Capacity (*1) (kW) Heating Capacity range (kW) 1.9 to 8.30 * Power supply 1Ph,220-240V,50Hz Electric characteristics...
  • Page 9 2-2. Specifications of Performance When Each Indoor Units is Combined with Other Unit Combination of indoor units RAS‐2M18G3AVG-E, -TR Outdoor unit ： Operation mode ： Cooling Power supply voltage： 220V Unit Operating Indoor unit Cooling capacity (kW) Power consumption (W) Operating current (A) SEER Energy Grade...
  • Page 10 Combination of indoor units RAS‐2M18G3AVG-E, -TR Outdoor unit ： Operation mode ： Heating Power supply voltage： 220V Unit Operating Indoor unit capacity Cooling capacity (kW) Power consumption (W) Operating current (A) SCOP Energy Grade (kW) status Rate Rate Rate Rate Average Warmer Average Warmer ΣkBTU 1 unit 2.00...
  • Page 11 Combination of indoor units Outdoor unit ： RAS‐3M18G3AVG-E, -TR Operation mode ： Cooling Power supply voltage： 220V Operating Indoor unit Unit capacity (kW) Cooling capacity (kW) Power consumption (W) Operating current (A) SEER Energy Grade status Rate Rate Rate Rate ΣkBTU 1 unit 1.50...
  • Page 12 Combination of indoor units Outdoor unit ： RAS‐3M18G3AVG-E, -TR Operation mode ： Heating Power supply voltage： 220V Operating Unit capacity Indoor unit Cooling capacity (kW) Power consumption (W) Operating current (A) SCOP Energy Grade (kW) status C ΣkBTU Rate Rate Rate Rate Average Warmer Average Warmer 1 unit...
  • Page 13 Combination of indoor units Outdoor unit ： RAS‐3M18G3AVG-E, -TR Operation mode ： Cooling Power supply voltage： 230V Operating Indoor unit Unit capacity (kW) Cooling capacity (kW) Power consumption (W) Operating current (A) EER SEER Energy Grade status Rate Rate Rate Rate ΣkBTU 1 unit...
  • Page 14 Combination of indoor units Outdoor unit ： RAS‐3M18G3AVG-E, -TR Operation mode ： Heating Power supply voltage： 230V Operating Unit capacity Indoor unit Cooling capacity (kW) Power consumption (W) Operating current (A) SCOP Energy Grade (kW) status C ΣkBTU Rate Rate Rate Rate Average Warmer Average Warmer 1 unit...
  • Page 15 Combination of indoor units Outdoor unit ： RAS‐3M18G3AVG-E, -TR Operation mode ： Cooling Power supply voltage： 240V Operating Indoor unit Unit capacity (kW) Cooling capacity (kW) Power consumption (W) Operating current (A) SEER Energy Grade status Rate Rate Rate Rate ΣkBTU 1 unit 1.50...
  • Page 16 Combination of indoor units Outdoor unit ： RAS‐3M18G3AVG-E, -TR Operation mode ： Heating Power supply voltage： 240V Unit Operating Indoor unit capacity Cooling capacity (kW) Power consumption (W) Operating current (A) SCOP Energy Grade (kW) status B ΣkBTU Rate Rate Rate Rate Average Warmer Average Warmer 1 unit...
  • Page 17 Operation Characteristic Curve RAS-2M18G3AVG-E, -TR <Cooling> <Heating> 12.0 12.0 Conditions Indoor : DB 27 C/WB 19 Conditions Outdoor : DB 35 C/WB 24 Indoor : DB 20 C/WB 15 Indoor Air Flow : High Outdoor : DB 7 C/WB 6 10.0 10.0 Pipe Length : 5m x 2...
  • Page 18 Operation Characteristic Curve RAS-3M18G3AVG-E, -TR <Cooling> <Heating> 12.0 12.0 Conditions Indoor : DB 27 C/WB 19 Conditions Outdoor : DB 35 C/WB 24 Indoor : DB 20 C/WB 15 Indoor Air Flow : High Outdoor : DB 7 C/WB 6 10.0 10.0 Pipe Length : 5m x 2...

  • Page 19: 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 20 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 21 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 22 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 23 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 24 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 25 3-5. Brazing of Pipes 3. Types of flux 3-5-1. Materials for Brazing • Noncorrosive flux 1. Silver brazing filler Generally, it is a compound of borax and boric Silver brazing filler is an alloy mainly composed acid. of silver and copper. It is used to join iron, copper It is effective in case where the brazing tem- or copper alloy, and is relatively expensive though perature is higher than 800°C.
  • Page 26 3-5-3. Brazing As brazing work requires sophisticated techniques, experiences based upon a theoretical knowledge, it must be performed by a person qualified. Flow meter In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to Stop valve proceed with brazing while letting dry Nitrogen gas (N2) flow.

  • Page 27: Construction Views

    4. CONSTRUCTION VIEWS 4-1. Outdoor Unit - 27 -...

  • Page 28: Wiring Diagram

    5. WIRING DIAGRAM 5-1. Outdoor Unit RAS-2M18G3AVG-E, -TR - 28 -...
  • Page 29 RAS-3M18G3AVG-E, -TR - 29 -...

  • Page 30: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Outdoor Unit No. Parts name Model name Rating Compressor 2M18 KTN150D63UFZ3 3-Phases (6-Poles);1020W 3M18 Outdoor fan motor Output 43W WDF-340-A43-1 Reactor CH-57 10mH、16A Reactor CH-76 9.9mH、1A 4-way valve coil SQ-D27012-000752 AC220-240V PMV coil DC12V PQ-M10012-001382 P.C.

  • Page 31: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant cycle diagram RAS-2M18G3AVG-E,-TR Temp. measurement Indoor unit A B room B room Evaporator Cross flow fan Per 1 unit Max. : 20m Connecting pipe Min. : 2m Connecting pipe Thickness : 0,8mm Thickness : 0,8mm Total dia.6,35 dia.9,52...
  • Page 32 RAS-3M18G3AVG-E,-TR Temp. measurement Indoor unit A C room B room C room B room Evaporator Cross flow fan Per 1 unit Max. : 25m Min. : 2m Connecting pipe Connecting pipe Thickness : 0,8mm Total Thickness : 0,8mm dia.6,35 dia.9,52 Max.
  • Page 33 7-2.　Operation　Data : RAS‐2M18G3AVG-E, -TR Outdoor　Unit <Cooling> Temperature No.of Standard Heat exchanger Compressor Indoor unit Indoor condition operating pressure pipe temperature revolution Indoor Outdoor units P（MP） T1(℃) T2(℃) （rps） 27/19 35/- 1 FCU 1.1 to 1.3 17 to 19 38 to 40 High －...
  • Page 34 : RAS‐3M18G3AVG-E, -TR Outdoor　Unit <Cooling> Temperature No.of Standard Heat exchanger Compressor Indoor unit Indoor condition operating pressure pipe temperature revolution Indoor Outdoor units P（MP） T1(℃) T2(℃) （rps） 27/19 35/- 1 FCU 1.1 to 1.3 17 to 19 38 to 40 High －...
  • Page 35 : RAS‐3M18G3AVG-E, -TR Outdoor　Unit <Heating> Temperature No.of Standard Heat exchanger Compressor Indoor unit Indoor condition operating pressure pipe temperature revolution Indoor Outdoor units P（MP） T1(℃) T2(℃) （rps） 20/15 1 unit 2.2 to 2.4 38 to 40 3 to 5 High －...

  • Page 36: Control Block Diagram

    8. CONTROL BLOCK DIAGRAM 8-1．Outdoor Unit (Inverter Assembly) RAS-2M18G3AVG-E,-TR Outdoor temp. sensor Gas side pipe temp. sensor Suction temp. sensor Evaporator temp. sensor Discharge temp. sensor WP-514 (Control P.C.B) A unit P.M.V. Ｍ.Ｃ.Ｕ Driver A unit Serial Signal ・Inverter outdoor frequency control circuit Communication ・A/D converter function...
  • Page 37 RAS-3M18G3AVG-E,-TR Outdoor temp. sensor Gas side pipe temp. sensor Suction temp. sensor Evaporator temp. sensor Discharge temp. sensor WP-514 (Control P.C.B) A u nit P.M.V. Ｍ.Ｃ.Ｕ Driver A unit Serial Signal ・Inverter outdoor frequency control circuit Communication ・A/D converter function B unit P.M.V.

  • Page 38: 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, which uses DC motor for the indoor fan to IGBT module (Compressor stop function) motor and the outdoor fan motor.
  • Page 39 9-2. Operation Description 1. Basic operation ........................40 1. Operation control ....................... 40 2. Operating mode selection when performing 2-room operation ......... 41 3. Cooling/Heating operation ....................41 2. Outdoor fan motor control ....................... 42 3. Capacity control ........................43 Current release control ......................

  • Page 40: 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 41: Operating Mode Selection When Performing 2-Room Operation

    Item Operation flow and applicable data, etc. Description 2. Operating mode selection when performing 2-room operation 1. Basic operation 1) The outdoor unit operating mode conforms to the instructions of the indoor unit that was pushed first. 2) When combined operation consisting of cooling (dry) and heating, fan (air purification) and heating, or cleaning operation and heating is performed, operation conforms to the instructions of the indoor unit that was pushed first as shown in the following table.

  • Page 42: 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 43: Capacity Control

    Item Operation flow and applicable data, etc. Description 2. Outdoor fan Heating operation motor control RAS-2M18G3AVG-E,-TR Compressor revolution (rps) 〜31 〜46 47〜 Outdoor temp. sensor To Normal operation To≧10℃ 0≦To＜10℃ -5≦To＜0℃ To＜-5℃ Sleep or quiet To≧10℃ 420* 420* 470* operation 0≦To＜10℃...

  • Page 44: Current Release Control

    Item Operation flow and applicable data, etc. Description 4. Current release This function prevents troubles on the electronic parts of the 1) The input current of the outdoor control compressor driving inverter. unit is detected in the inverter section of the outdoor unit. This function also controls drive circuit of the compressor speed so that electric power of the compressor drive circuit 2) According to the detected...

  • Page 45: Winding/Coil Heating Control

    Item Operation flow and applicable data, etc. Description 5. Winding/Coil When the outdoor temperature is low, the windings/ Winding/Coil heating is performed when heating control coils are heated to ensure compressor reliability. the following conditions are met. Condition 1 : Outdoor temperature To Winding/Coil When the discharge sensor temperature...

  • Page 46: Discharge Temperature Control

    Item Operation flow and applicable data, etc. Description 1. Purpose 8. 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 47: Intermittent Operation Control For Indoor Fans Of The Indoor Unit At Thermo-Off Side In Heating Operation

    9-3. Intermittent Operation Control for Indoor Fans of the Indoor Unit at Thermo-off Side in Heating Operation While heating operation is executed in two rooms, if room temperature reached the setup temperature in one room and thermo-off occurred, the following operations start. (Refer to the figure below.) 1.
  • Page 48 9-4-2. 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 49 [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 50 9-4-4. 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 51 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 52 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 53 9-4-5. How to set the SERVICE SWITCH SETTING. If you want to set the "COOLING ONLY SETTING OFF ⇒ ON" . ○: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)
  • Page 54 9-4-6. 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 55: Installation Procedure

    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 has been changed.(1/2 UNF 20 threads per inch) • In order to increase the pressure resisting strength of the refrigerant piping flare processing diameter and size of opposite side of flare nuts has been changed.
  • Page 56 Product F-GAS label Drain nipple specif cation ∗1 Part that do not exist in RAS-2M18G3AVG-TR, RAS-3M18G3AVG-TR 10-2-2. Refrigerant Piping • Piping kit used for the conventional refrigerant cannot be used. • Use copper pipe with 0.8 mm or more thickness.
  • Page 57 10-2-5. Installation Draining Off the Water from the Outdoor Unit Install 2 waterproof rubber caps and the drain nipple to drain off the ■ Installation Location water from the outdoor unit. • Seal the knock-out holes and screw/thread areas tightly using a silicon •...
  • Page 58 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 flare CAUTION nut as much as possible with your fingers, then tighten the nut using a torque wrench.
  • Page 59 ■ Insulation of the Refrigerant Pipes ■ Air Purge • Insulate the refrigerant pipes for liquid and gas From the sake of environmental protection, use a vacuum pump to extract the air during installation. separately. * Prepare a 4 mm hexagon wrench. 1.
  • Page 60 CAUTION 4. Connect the wires for the power source and each indoor • Incorrect/incomplete wiring will cause electrical unit. fires or smoke. • Connect the connecting cable to the terminal as • Prepare the power source for exclusive use with identified by the matching numbers on the terminal the air conditioner.
  • Page 61 3. Turn on the circuit breaker to supply electricity. ■ Gas Leak Inspection In the initial LED display status, D805 is lighted as below. Refer to the “ Gas Leak Inspection”. : ON, : OFF, : Rapid Flashing (5 times/sec.), ...
  • Page 62 5. Press SW01 for 1 time. Then D804 light is f ashing (5 times/sec.). Pump-down Operation D800 D801 D802 D803 D804 D805 ■ Pump-down Operation (Recovering refrigerant)      6. Press SW02 for 1 time. Then D805 light is f ashing (5 times/sec.). CAUTION D800 D801...

  • Page 63: 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 64 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 65 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 66 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 condi- tion and indicates the information of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 67 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 68 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 69 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 70 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 Outdoor P.C. (Relation of voltage, current error is detected packed valve opening, refrigerant board...
  • Page 71 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 72 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%) (including operates error is detected...
  • Page 73 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 74 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.
  • Page 75 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 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.) [1C]  [Case thermo operation, Power supply error ] Is AC mains voltage correct? Confirm power supply (198 to 264V) construction.
  • Page 77 :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.) [18] ∗ There is a possibility that it is one of the following errors. Confirm LED on display P.C.
  • Page 78 :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 79 :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 CN64 Correct connector.
  • Page 80 :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 81 :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. [20] Confirm LED on display P.C.
  • Page 82 :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 83 11-7. Inspection of the Main Parts [1] Sensor characteristic table : Discharge temp. sensor : Outdoor temp. sensor : Outdoor heat exchanger temp. sensor : Suction temp. sensor TGa to TGc : Gas side temp. sensor TO, TE, TS, TGa to TGc Temperature (˚C) Outdoor Unit Part name...
  • Page 84 11-8. 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 85 <WP-044> Power supply connector (CDB) Lead and connector for Reactor P08(Black), P09(White) P21, P22 (Gray) Lead and connector for Reactor P16, P17 (White) Electrolytic capacitors(760µF/400V) Lead wire for grounding P07 (Black) Power supply connector lead wire P01(Black), P02(White) 4-way valve connector CN703 (Yellow) Compressor leads P04 (Black)
  • Page 86 <WP-514> RAS-2M18G3AVG-E,-TR UART communication connector Power, Alarm display LED D801(Red) CN82(Blue) Indoor/Outdoor communication wire protective Fuse Connector for display F03(250V,3.15A,plastic case) CN85(White) Indoor/Outdoor communication signal LED D501,D508(Green,Outdoor→Indoor) Temp. sensor connector TS CN63(White) TO CN62(White) TE CN61(White) TD CN60(White) TGB CN65(Red) TGA CN64(Yellow) Power supply connecting connector...

  • Page 87: 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 88 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 89 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 90 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 (2P : green) CN703 : 4 way valve coil (3P : yellow)
  • Page 91 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 92 No. Part name Procedure Remarks ⑥ Compressor 1) Perform works from ① to ⑤. 2) Recover the refrigerant gas form the outdoor unit. Partition 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 93 No. Part name Procedure Remarks ⑧ 1. Detachment Electronic expansion 1) Perform step 1 in 2 , all the steps in 3 and valve coil 1 in 4 . 2) Turn the coil by 180 degrees then remove by pull it upward. Attachment 1) Insert the coil at position which perpendicular with pipe of PMV then turn...
  • Page 94 No. Part name Procedure Remarks 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 95 No. Part name Procedure Remarks High pressure 1.Detachment ⑮ 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 96: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Outdoor Unit For 2M18 For 3M18 38,42 37,41 36,40 Location Part Location Part Description Description 43T42383 BASE PLATE ASSEMBLY 43T46534 BODY-PMV 43T00560 LEFT CABINET 43T46535 COIL-PMV 43T00672 RIGHT SIDE CABINET ASSEMBLY 43T46424 4 WAY VALVE 43T00561 UPPER CABINET 43T63327...
  • Page 97 13-2. Inverter Assembly RAS-2M18G3AVG-E, -TR (LED) Location Part Location Part Description Description 43TN9832 ASM-L-PCB 43T50360 TC-SENSOR(TO) 43TN9835 PC BOARD ASSY 43T50334 TEMPERATURE SENSOR 43T61325 BASE,PC BORAD 43T50361 SENSOR-TEMP 43T61320 BASE, PC BOARD 43T50362 SENSOR-TEMP 43TN9875 PC BOARD ASSY(LED) 43T62401 TUBE 43T60423 SERV-TERMINAL 43T63317...
  • Page 98 RAS-3M18G3AVG-E, -TR (LED) Location Part Location Part Description Description 43TN9832 ASM-L-PCB 43T50334 TEMPERATURE SENSOR 43TN9836 PC BOARD ASSY 43T50361 SENSOR-TEMP 43T61325 BASE,PC BORAD 43T50362 SENSOR-TEMP 43T61320 BASE, PC BOARD 43T50363 SENSOR-TEMP 43TN9875 PC BOARD ASSY(LED) 43T62401 TUBE 43T60423 SERV-TERMINAL 43T63317 HOLDER,SENSOR 43T58341 REACTOR...
  • Page 99 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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