TGM MWFOT12S Service Manual
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TGM MWFOT12S Service Manual

Fixed speed series - 50 hertz
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FIXED SPEED SERIES - 50 HERTZ
2017 SERVICE MANUAL

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  • Page 1 FIXED SPEED SERIES - 50 HERTZ 2017 SERVICE MANUAL...

  • Page 2: Table Of Contents

    Table of Contents Page 1. Safety Precautions ..................1 In case of Accidents or Emergency Pre-Installation and Installation Operation and Maintenance 2. Specifications ....................3 Model Reference Electrical Wiring Diagrams 3. Product Features ................... 9 Operation Modes and Functions 4. Maintenance and Disassembly ..............13 Maintenance Disassembly 5.

  • Page 3: Safety Precautions

    Safety Precautions Contents In Case of Accidents or Emergency ..............2 Pre-Installation .......................2 Operation and Maintenance .................2...

  • Page 4: In Case Of Accidents Or Emergency

    For more information, contact your dealer, this task. seller, or an authorized TGM service center. • • When the unit is not to be used for an extended time, disconnect the power supply or turn off the breaker.

  • Page 5: Specifications

    Specifications Contents Model Reference ....................4 Electrical Wiring Diagrams ..................5 Indoor Unit ....................5 Outdoor Unit ....................7...

  • Page 6: Model Reference

    1. Model Reference Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equipment. Indoor Unit Model Outdoor Unit Model Capacity (Btu) Power Supply MWFOT12S MRFOT12DS MWFOT18S MRFOT18DS 220-240V~, 50Hz, 1Phase MWFOT24S MRFOT24DS ...

  • Page 7: Electrical Wiring Diagrams

    2. Electrical Wiring Diagrams Indoor unit Abbreviation Paraphrase Yellow-Green Conductor Positive and Negative Ion Generator Capacitor PLASMA Electronic Dust Collector to CCM Comm.Bus Central Controller (for CAC) X Y E 485 Communication Line LIVE NEUTRAL Heater The Electric Heating Belt of Indoor Unit Indoor Room Temperature Coil Temperature of Indoor Heat Exchanger Middle Coil Temperature of Condenser...
  • Page 8 MWFOT12S MWFOT18S OPTIONAL OPTIONAL INDOOR WIRING DIAGRAM Applicable to AC motor only 16022000025311 5(3 or 2) OPTIONAL HEATER SWITCH BOARD CN701 OPTIONAL OPTIONAL E 12V/5V HA HB To Randomly To CCM Comm.Bus or To Remote Alarm To Remote Switch Connected...

  • Page 9: Outdoor Unit

    Outdoor Unit Abbreviation Paraphrase 4-WAY Gas Valve Assembly/4-WAY VALVE AC-FAN Alternating Current FAN DC-FAN Direct Current FAN AC Current Detector COMP Compressor L-PRO Low Pressure Switch H-PRO High Pressure Switch MRFOT12DS; MRFOT18DS N O TE: 1. The w i r i ng di agr am i s f or expl anat i on pur pose onl y.
  • Page 10 MRFOT24DS 1(3) 2(4) Symbol 1: indicates compressor internal or external components.  Page 8 ...

  • Page 11: Product Features

    Product Features Contents Operation Modes and Functions ................10 Abbreviation ....................10 Safety Features ....................10 Digital Display ....................10 Fan Mode ....................11 Cooling Mode .....................11 Auto-mode ....................11 Drying Mode ....................11 Forced Operation Function ................11 Auto-Restart Function ..................11 1.10 Refrigerant Leakage Detection ..............12 1.11 Self Clean(Optional) ..................12 1.12 Follow Me(Optional) ..................12 1.13 Information Inquiry ..................12...
  • Page 12 1. Operation Modes and Functions Digital Display Unit display functions Abbreviation Unit element abbreviations Abbreviation Element Indoor room temperature Coil temperature of evaporator Coil temperature of condenser Outdoor ambient temperature Function Display Safety Features Temperature Set temperature value Temperature Compressor three-minute delay at restart (fan and Drying Room temperature Compressor functions are delayed for up to one minute...

  • Page 13: Fan Mode

    Fan Mode • Pressing the forced auto button. • If AC is off, it will run in auto mode when the timer When fan mode is activated: on function is active. • The outdoor fan and compressor are stopped. • After setting the mode, AC will run in auto mode if the compressor keeps not running for certain time.
  • Page 14 • If there is a power failure while the unit is running, the active. compressor starts 3 minutes after the unit restarts. If • Once active, the remote control will send a signal the unit was already off before the power failure, the every 3 minutes, with no beeps.

  • Page 15: Maintenance And Disassembly

    Maintenance and Disassembly Contents Maintenance ......................14 First Time Installation Check ................14 Refrigerant Recharge ...................16 Re-Installation .....................17 1.3.1 Indoor Unit ..................17 1.3.2 Outdoor Unit ................19 Disassembly ......................21 Indoor Unit ....................21 Outdoor Unit ....................33...

  • Page 16: Maintenance

    1. Maintenance First Time Installation Check To prevent air and moisture from affecting the air Air and moisture trapped in the refrigerant system affects conditioner’s performance, the indoor unit, as well as the the performance of the air conditioner by: pipes between the indoor and outdoor unit, must be be •...
  • Page 17 Procedure: • If the pressure does not achieve -0.1 MPa Tighten the flare nuts of the indoor and outdoor (14.5 Psi) after 50 minutes, check for leakage. units, and confirm that both the 2- and 3-way valves are closed. • If the pressure successfully reaches -0.1 MPa (14.5 Psi), fully close the Handle Lo valve and Connect the charge hose with the push pin of Handle cease vacuum pump operations.

  • Page 18: Refrigerant Recharge

    Refrigerant Recharge Prior to recharging the refrigerant, confirm the additional amount of refrigerant required using the following table: Models Standard length Max. elevation Max. length Additional refrigerant 5m (16.4ft) 8m (26.2ft) 20m (65.6ft) 20g/m (0.21oz/ft) 5m (16.4ft) 10m (32.8ft) 25m (82ft) 20g/m (0.21oz/ft) 21k&24k 5m (16.4ft)

  • Page 19: Re-Installation

    Re-Installation 1.3.1 Indoor Unit Collecting the refrigerant into the outdoor unit Procedure: Operate the air conditioner in cooling mode. Cease Confirm that the 2- and 3-way valves are opened. operations when the gauge reaches 0.1 MPa Remove the valve stem caps and ensure that the valve (14.5 Psi).
  • Page 20 Air purging with vacuum pump Procedure: • If the pressure does not achieve -0.1 MPa Tighten the flare nuts of the indoor and outdoor (14.5 Psi) after 50 minutes, check for leakage. units, and confirm that both the 2- and 3-way valves are closed.

  • Page 21: Outdoor Unit

    1.3.2 Outdoor Unit Evacuation for the whole system Procedure: Close the valve (Low side) on the charge set and turn Confirm that the 2- and 3-way valves are opened. off the vacuum pump. Connect the vacuum pump to the 3-way valve’s Wait a period of five minutes then check whether the service port.
  • Page 22 Refrigerant charging Procedure: Connect the charge hose to the 3-way service port Open the valves (Low side) on the charge set and and then open the 2- and the 3-way valves. charge the system with liquid refrigerant. Connect the charge hose to the valve at the bottom When the electronic scale displays the correct weight of the cylinder.

  • Page 23: Disassembly

    2. Disassembly Indoor unit Front Panel Procedure Illustration 1) Hold the front panel by the tabs on Front Panel the both sides and lift it (see CJ_ AF_001). CJ_AF_001 2) Push up the bottom of an air filter, and then pull it out downwards (see CJ_AF_002).
  • Page 24 Procedure Illustration 3) Open the horizontal louver and push the hook towards left to open it (see CJ_AF_003). Horizontal Louver Hook CJ_AF_003 4) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver (see CJ_AF_004).
  • Page 25 Procedure Illustration 5) Remove 1 screw and then remove the electrical cover(see CJ_AF_005-1 and CJ_AF_005-2). CJ_AF_005-1 CJ_AF_005-2 6) Disconnect the connector for display board(see CJ_AF_005-3) . CJ_AF_005-3 7) Remove the display board(see CJ_ AF_005-4). CJ_AF_005-4 CJ_AF_005 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 26 Procedure Illustration 8) Open the screw caps(2) and the remove the screws(see CJ_AF_006). 9) Release the 4 hooks. CJ_AF_006 10) Release the seven hooks in the back (see CJ_AF_007). Hooks CJ_AF_007 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 27 Procedure Illustration 11) Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger (see CJ_AF_008 ). CJ_AF_008 Panel Frame Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 28 Electrical parts Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts. Procedure Illustration 1) Remove the fixing screw and then remove the cover of electronic box and the terminal cover (see CJ_AF_009). Electronic Cover Fixing Screw CJ_AF_009 2) Pull out the room temperature sensor (T1) and the coil temperature sensor...
  • Page 29 Procedure Illustration 4) Remove the fixing screw (see CJ_ AF_011-1). 5) Pull out the Electrical control box along the direction indicated in right image. to remove it (see CJ_AF_011-2). Fixing Screw CJ_AF_011-1 Electronic Box CJ_AF_011-2 Swing Motor Applicable to AC Motor Only Indoor Fan Motor 6) Disconnect the wires.
  • Page 30 Procedure Illustration 7) Remove the fixing screw, then remove the capacitor of fan motor (see CJ_ AF_013). Capacitor of Fan Motor CJ_AF_013 Note: This section is for reference only. Actual unit appearance may vary.  Page 28 ...
  • Page 31 Evaporator Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) before disassembling evaporator. Procedure Illustration 1) Disassemble the pipe holder located at the rear of the unit (see CJ_AF_014). Pipe Holder CJ_AF_014 2) Remove the screws on the evaporator located at the fixed plate (see CJ_AF_015).
  • Page 32 Procedure Illustration 4) Pull out the evaporator (see CJ_AF_017). Evaporator CJ_AF_017 Note: This section is for reference only. Actual unit appearance may vary.  Page 30 ...
  • Page 33 Fan motor and fan Note: Remove the front panel, electrical parts and evaporator (refer to 1. Front panel, 2. Electrical parts, and 3. Evaporator). before disassembling fan motor and fan. Procedure Illustration 1) Remove the two screws and remove the fixing board of the fan motor (see CJ_ AF_018).
  • Page 34 Step motor Note: Remove the front panel and electrical parts (refer to 1. Front panel, 2. Electrical parts) before disassembling step motor. Procedure Illustration 1) Remove the two screws, then remove the stepping motor (see CJ_AF_021). Stepping Motor CJ_AF_021 Note: This section is for reference only. Actual unit appearance may vary. ...

  • Page 35: Outdoor Unit

    Outdoor unit Panel Plate MRFOT12DS; MRFOT18DS Procedure Illustration 1) Turn off the air conditioner and the Big Handle power breaker. 2) Remove the screws of the big handle and then remove the big handle (1 screws) (see CJ_BA30_001). CJ_BA30_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 36 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_BA30_003). Front Panel CJ_BA30_003 5) Remove the screws of water collecting Water Collecting Cover cover (1 screw) (see CJ_BA30_004). CJ_BA30_004 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 37 Procedure Illustration 6) Remove the screws of the rear net and then remove the rear net (2 screws) (see CJ_BA30_005). CJ_BA30_005 7) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_BA30_006). Right Panel CJ_BA30_006 Note: This section is for reference only.
  • Page 38 MRFOT24DS Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (1 screws) (see CJ_CA30_001). Big Handle CJ_CA30_001 3) Remove the screws of the top cover Top Cover and then remove the top cover (3 screws).
  • Page 39 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (6 screws) (see CJ_CA30_003). Front Panel CJ_CA30_003 5) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_ CA30_004).
  • Page 40 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (6 screws) (see CJ_CA30_005). Right Panel CJ_CA30_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 38 ...
  • Page 41 Fan disassembly Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. MRFOT12DS; MRFOT18DS Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_001). 2) Remove the fan. D-cut CJ_ODU_001 3) Disconnect the connectors for fan motor.
  • Page 42 Procedure Illustration 4) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_003). 5) Remove the fan motor. Fan Motor CJ_ODU_003 Note: This section is for reference only. Actual unit appearance may vary.  Page 40 ...
  • Page 43 MRFOT24DS Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_004). 2) Remove the fan. D-cut CJ_ODU_004 Fan Motor 3) Disconnect the connectors for fan motor. (Blue wire, red wire, brown wire and black wire. The blue wire and brown wire are on the capacitor.
  • Page 44 Procedure Illustration 4) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_006). 5) Remove the fan motor. Fan Motor CJ_ODU_006 Note: This section is for reference only. Actual unit appearance may vary.  Page 42 ...
  • Page 45 Electrical parts Note: Remove the air outlet grille(refer to 1. Panel plate) before disassembling electrical parts. MRFOT12DS; MRFOT18DS Procedure Illustration 1) Remove the two screws fixed the electronic control board (see CJ_ ODU_007). 2) Two Fixing Screws 2) Disconnect the wires connected to the compressor.
  • Page 46 MRFOT24DS Procedure Illustration Fan Motor 1) Disconnect the wires connected to 4-Way Valve the compressor. (Red wire connects Compressor with PCB board, others connects with terminals) (see CJ_ODU_008) 2) Disconnect the wires connected to 4-way valve. (see CJ_ODU_008) 3) Disconnect the wires connected to the transformer.
  • Page 47 Sound blanket WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling sound blanket. Procedure Illustration 1) Remove the sound blanket (side and top) (see CJ_ODU_010).
  • Page 48 Compressor WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling compressor. Procedure Illustration 1) Remove the flange nut of terminal cover and remove the termianal cover (see CJ_ ODU_011).
  • Page 49 Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_013). CJ_ODU_013 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_014). 5) Lift the compressor from the base pan Discharge Pipe assembly with pliers.

  • Page 50: Troubleshooting

    Troubleshooting Contents Safety Caution .....................49 General Troubleshooting ..................50 Error Diagnosis and Troubleshooting Without Error Code .......51 Remote maintenance ...................51 Field maintenance ..................52 Quick Maintenance by Error Code ..............53 Troubleshooting by Error Code ................58 Common Check Procedures.................58 E0(EEPROM parameter error) ...............59 E1(Indoor and outdoor unit communication error)(For MSAFD-21CRN1-QB6W, MWFOT24S) ................60 E2 (Zero crossing detection error diagnosis and solution) ......61...

  • Page 51: Safety Caution

    1. Safety Caution WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. Electrolytic Capacitors For other models, connect discharge resistance (approx.100Ω 40W) or a soldering iron plug between the positive and negative terminals of the electrolytic capacitor.

  • Page 52: General Troubleshooting

    2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the indicator light will flash in a corresponding series, the timer display may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following table: Indicator Timer...

  • Page 53: Error Diagnosis And Troubleshooting Without Error Code

    3. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance. Problem Solution Unit will not start Page 54-55...

  • Page 54: Field Maintenance

    Field maintenance Problem Solution Unit will not start Page 56-57 Compressor will not start but fans run Page 56-57 Compressor and condenser (outdoor) fan will not start Page 56-57 Evaporator (indoor) fan will not start Page 56-57 Condenser (Outdoor) fan will not start Page 56-57 Unit runs, but shortly stops Page 56-57...

  • Page 55: Quick Maintenance By Error Code

    4. Quick Maintenance by Error Code If you do not have the time to test whether specific parts are faulty, you can directly change the required parts according the error code. You can find the parts to replace by error code in the following table. Error Code Part requiring replacement...
  • Page 56 1.Remote Maintenance Electrical Circuit Refrigerant Circuit Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ Operation is erratic, unpredictable, or unit is unresponsive The tempreture on the playboard cannot be setted ☆ ☆ Unit is on but the wind is not cold(hot) ☆...
  • Page 57 Others ☆ ☆ ☆ ☆ ☆ ☆ ☆  Page 55 ...
  • Page 58 Electrical Circuit 2.Field Maintenance Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ ☆ ☆ Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆ Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆...
  • Page 59 Refrigerant Circuit Others ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆...

  • Page 60: Troubleshooting By Error Code

    5. Troubleshooting by Error Code Common Check Procedures 5.1.1 Temperature Sensor Check Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Measure the resistance value of each winding by using the multi-meter.

  • Page 61: E0(Eeprom Parameter Error)

    E0 (EEPROM parameter error) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Indoor PCB • Outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later. Is it still displaying the error The unit is operating normally.

  • Page 62: E1(Indoor And Outdoor Unit Communication Error)

    E1 (Indoor and outdoor unit communication error) (only for MWFOT24S) Description: The indoor unit has not received feedback from the outdoor unit for 120 seconds. Recommended parts to prepare: • Indoor PCB • Outdoor PCB • Reactor Troubleshooting and repair: Power off, then restart the unit after 2 minutes.

  • Page 63: E2 (Zero Crossing Detection Error Diagnosis And Solution)

    E2 (Zero crossing detection error diagnosis and solution) Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. Recommended parts to prepare: • Connection mistake • PCB faulty Troubleshooting and repair: Check the connections and power supply.

  • Page 64: E3(Fan Speed Has Been Out Of Control Diagnosis And Solution)

    E3(Fan speed has been out of control diagnosis and solution) Description: When indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display the failure. Recommended parts to prepare: • Wiring mistake •...
  • Page 65 Index: 1. Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply) or 50V(115V power supply), the PCB must has problems and need to be replaced.

  • Page 66: E4/E5 (Open Circuit Or Short Circuit Of Temperature Sensor Diagnosis And Solution)

    E4/E5 (Open circuit or short circuit of temperature sensor diagnosis and solution) Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure. Recommended parts to prepare: • Wiring mistake • Faulty sensor •...

  • Page 67: E7 (Indoor Pcb /Display Board Communication Error)

    E7 (Indoor PCB /Display board communication error) Description: Indoor PCB does not receive feedback from Display board. Recommended parts to prepare: • Wiring mistake • Faulty PCB • Display board malfunction Troubleshooting and repair: Power off, then restart the unit 2 minutes later.

  • Page 68: Ec (Refrigerant Leakage Detection Diagnosis And Solution)

    EC (Refrigerant Leakage Detection diagnosis and solution) Description: Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2<Tcool-2°C does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...

  • Page 69: Appendix

    Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..68...
  • Page 70 i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731...

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