TGM MWVIT09SA Service Manual
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TGM MWVIT09SA Service Manual

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Vision Inverter Series
Service Manual 2016

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Summary of Contents for TGM MWVIT09SA

  • Page 1 Vision Inverter Series Service Manual 2016...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................3 1.1 Safety Precaution .......................... 3 1.2 Warning ............................3 2. Model Lists ..............................6 3. Dimension ..............................7 3.1 Indoor Unit ............................. 7 3.2 Outdoor Unit ..........................10 4. Refrigerant Cycle Diagram ........................14 5 Installation Details ............................16 5.1 Wrench torque sheet for installation ...................

  • Page 3: Precaution

    Sharp edges could cause injury, be especially careful of the case edges and the fins on the 1. Precaution condenser and evaporator.  For installation, always contact the 1.1 Safety Precaution dealer or an authorized service center.   To prevent injury to the user or other Do not install the product on a people and property damage, the following defective installation stand.
  • Page 4 disconnect the power supply cable. A bad connection may cause water leakage.  There is risk of electric shock or fire. Keep level even when installing the  Stop operation and close the window product. It can avoid vibration of water leakage. in storm or hurricane.
  • Page 5 is operated.  Do not drink the water drained from the product.  Use a firm stool or ladder when cleaning or maintaining the product. Be careful and avoid personal injury.  Replace the all batteries in the remote control with new ones of the same type. Do not mix old and new batteries or different types of batteries.

  • Page 6: Model Lists

    2. Model Lists Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units MWVIT09SA MRVIT09ASA MWVIT09S MRVIT09AS Inverter MWVIT12SA MRVIT12ASA MWVIT12S MRVIT12AS MWVIT18S MRVIT18AS MWVIT24S MRVIT24AS...

  • Page 7: Dimension

    3. Dimension 3.1 Indoor Unit Model MWVIT09SA MWVIT09S MWVIT12SA MWVIT12S MWVIT18S 1004 MWVIT24S 1130...
  • Page 8 For MWVIT09SA, MWVIT09S, MWVIT12SA, MWVIT12S...
  • Page 9 For MWVIT18S For MWVIT24S...

  • Page 10: Outdoor Unit

    3.2 Outdoor Unit...
  • Page 11 For MRVIT09ASA, MRVIT09AS, MRVIT12ASA, MRVIT12AS 779 W3 487 W1 300 D 770 W 70 W2 25 B1 61.5 A2 12 A1...
  • Page 12 For MRVIT18AS 815 W3 514 W1 333 D 800 W 70 W2 62 B1 D2 D3 20 A1 61.6 A2...
  • Page 13 For MRVIT24AS...

  • Page 14: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram For cooling only models: INDOOR OUTDOOR LIQUID SIDE CAPILIARY TUBE HEAT EXCHANGE (EVAPORATOR) HEAT T1 Room temp. EXCHANGE sensor (CONDENSER) T2 Evaporator temp. sensor GAS SIDE COMPRESSOR...
  • Page 15 For heat pump models: INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) T1 Room temp. sensor T2 Evaporator temp. sensor GAS SIDE 4-WAY VALVE 3-WAY VALVE ACCUMULATOR COOLING COMPRESSOR HEATING...

  • Page 16: Installation Details

    5 Installation Details 5.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N.cm N.cm Ф6.35 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 3500(357kgf.cm) 3600(367kgf.cm) Ф15.9 4500(459kgf.cm) 4700(479kgf.cm) Ф19 6500(663kgf.cm) 6700(683kgf.cm) 5.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Rated current of appliance Nominal cross-sectional area (mm²) >3 and ≤6...

  • Page 17: Pipe Length And The Elevation

    The pipe length and refrigerant amount: Standard Max. Max. Additional Pipe size Model length Elevation Length refrigerant Liquid B (m) A (m) (g/m) 3/8’’ 1/4’’ MWVIT09SA+ MRVIT09ASA (Ф6.35) (Ф9.52) 3/8’’ 1/4’’ MWVIT09S+ MRVIT09AS (Ф6.35) (Ф9.52) 1/2’’ 1/4’’ MWVIT12SA+ MRVIT12ASA (Ф12.7) (Ф6.35) 1/2’’ 1/4’’ MWVIT12S+MRVIT12AS (Ф12.7) (Ф6.35)

  • Page 18: Installation For The First Time

    connection to the vacuum pump. 5.4 Installation for the first time 4) Fully open the handle Lo of the manifold Air and moisture in the refrigerant system have valve. undesirable effects as below: 5) Operate the vacuum pump to evacuate. ●...

  • Page 19: Adding The Refrigerant After Running The System For Many Years

    3). Air purging. up to ensure the liquid charge. Open the valves on the charging cylinder and the 2). Purge the air from the charge hose. charge set. Purge the air by loosening the flare Open the valve at the bottom of the cylinder nut on the 2-way valve approximately 45’...

  • Page 20: Re-Installation While The Indoor Unit Need To Be Repaired

    purge the air (be careful of the liquid Open the handle Lo valve of the manifold valve refrigerant). slightly to purge air from the charge hose for 5 3) Put the charging cylinder onto the electronic seconds and then close it quickly. scale and record the weight.

  • Page 21: Re-Installation While The Outdoor Unit Need To Be Repaired

    discharge the refrigerant by loosening the flare nut on the 2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa. 6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems.
  • Page 22 cap to a torque of 18N.m. Be sure to check for gas leakage.

  • Page 23: Disassemble Guide

    6. Disassemble Guide Note: This disassemble guide take 24K indoor units as an example. 6.1 How to Remove the filter STEP1: Press the button on the both side of the indoor unit; STEP2: Open the panel, and because of two snap-fit, open it vigorously;...
  • Page 24 6.2 How to Remove the horizontal louver STEP1: Open the horizontal louver ,push the locker towards left to open it. STEP2: Bend the horizontal louver lightly, and pull it from the indoor unit. 6.3 How to Remove the panel assembly STEP1: Press the button on the both side of the indoor unit;...
  • Page 25 6.4 How to Remove the PCB STEP1: After disassembling the panel and the louver, remove 7 screws (For 9 K and12K units, have 5 screws. For 18K units, have 4 screws) and electrical cover; STEP2: Grab air grid with two hands and pull it upwards along the direction indicated in right image vigorously，so that the snap-fit inside can be disassembled, this is the key step for removing...
  • Page 26 How to Remove the Electrical control STEP1: Separate the frame part and the base plate part； STEP2: Remove the Screw on the cover of the electrical control box. STEP3: Disconnect the wires of the motor and the V-shape light, then pull out the coil temp and loose the earth wire.
  • Page 27 6.6 How to Remove the Chassis assembly STEP1: After removing the electrical box, remove 5 screws shown in the pictures. STEP2: The chassis is hold by the installation plate and two snap-fit designs. Grab the indoor unit and pull it away from the installation plate. STEP3: Grab both corner of the basis chassis like picture shown;...
  • Page 28 Remove Evaporator assembly STEP1: After removing the Chassis assembly. Removing the screw and unfolding the pipe clamp board shown in the picture; and the evaporator can be taken.

  • Page 29: Operation Characteristics

    7. Operation Characteristics Mode Cooling operation Heating operation Drying operation Temperature Room temperature 17℃~32℃ 0℃~30℃ 10℃~32℃ (62℉~90℉) (32℉~86℉) (50℉~90℉) Outdoor temperature 0℃~50℃ -15℃~30℃ 0℃~50℃ (32℉~122℉) (5℉~86℉) (32℉~122℉) -15℃~50℃ (5℉~122℉) (For the models with low temperature cooling system) CAUTION: 1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into operation and cause the unit to operate abnormally.

  • Page 30: Electronic Function

    Swing, Turbo or Silence feature is cancelled. 8. Electronic function Dispalys ‘ ’ under deforsting operation. 8.1 Abbreviation Dispalys ‘ ’ when anti-cold air feature is T1: Indoor room temperature activated under heating mode. T2: Coil temperature of evaporator Dispalys ‘ ’...
  • Page 31 8.2.2 V-shape light area Lights up in different color according to the operation mode: In (AUTO)COOL and DRY mode, the light is blue. In (AUTO)HEAT mode, the light is orange. The light is off in Fan mode. When room light is turned off, the display window will slowly darken after 5 seconds, and the buzzer turned off.

  • Page 32: Main Protection

    8.3 Main Protection This function is only active in cooling mode. It can better prevent the compressor being 8.3.1 Three minutes delay at restart for damaged by refrigerant leakage or compressor compressor overload. Less than 1 minute delay for the 1 time Open condition: start-up and 3 minutes delay for others.

  • Page 33: Operation Modes And Functions

    8.4 Operation Modes and Functions 8.4.1 Fan mode ( 1) Outdoor fan and compressor stop. High (2) Temperature setting function is disabled, and no setting temperature is displayed. (3) Indoor fan can be set to high/med/low/auto. (4) The louver operates same as in cooling mode.
  • Page 34 different. For MRVIT09AS , MRVIT18AS models, 8.4.2.4 Condenser temperature protection High For MRVIT09ASA, MRVIT12ASA, Decrease MRVIT12AS, MRVIT24AS models, Hold Increase Resume When condenser temperature temp. is more than setting value, the compressor will stop. 8.4.2.5 Evaporator temperature protection When Evaporator temperature temp.is less than setting value, the compressor will stop.
  • Page 35 Setting fan T1-Td℃ Actual fan speed speed H-（H-=H-G) H（=H） H+(H+=H+G) M-(M-=M-Z) Decrease M(M=M) M+(M+=M+Z) Hold L-(L-=L-D) L(L=L) Resume L+(L+=L+D) Auto fan action in heating mode: When evaporator temperature temp. is more than setting protection value, compressor will stop. T1-Td+¦ ¤ T 8.4.4 Auto-mode This mode can be chosen with remote controller and the setting temperature can be...
  • Page 36 auto-restart module. In case of a sudden power 8.4.5 Drying mode failure, the module memorizes the setting Indoor fan speed is fixed at breeze and can’t be conditions before the power failure. The unit will changed. The louver angle is the same as in resume the previous operation setting (not cooling mode.
  • Page 37 temperature. which keeps the room temperature steady at 8℃ and prevents household things freezing when the house is unoccupied for a long time in 8.4.15 Silence operation (optional) severe cold weather. Press the “silence” button on remote controller 8.4.13 Self clean(optional) to initiate SILENCE function.
  • Page 38 8.4.16 Point check function Press the LED DISPLAY or LED or MUTE button of the remote controller three times, and then press the AIR DIRECTION or SWING button three times in ten seconds, the buzzer will keep ring for two seconds.
  • Page 39 When the AC enter into the information enquiry status, it will display the code value in the next 25s , the details are as follows. Enquiry Display value Meaning Remark information T1,T2,T3,T4, -1F,-1E,-1d,-1c,- -25,-24,-23,-22,-21,-2 1. All the displaying temperature is actual T2B,TP,TH, 1b,-1A value.

  • Page 40: Troubleshooting

    9. Troubleshooting Safety Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, - terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.

  • Page 41: Indoor Unit Error Display

    9.1 Indoor Unit Error Display Operation Timer lamp Display LED STATUS lamp ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆ 3 times Zero-crossing signal detection error ☆ 4 times Indoor fan speed has been out of control Indoor room temperature sensor T1 open circuit or short ☆...

  • Page 42: Trouble Shooting

    9.2 Trouble shooting 9.2.1 EEPROM parameter error diagnosis and solution(E0/F4) E0/F4 Error Code Malfunction decision Indoor or outdoor PCB main chip does not receive feedback conditions from EEPROM chip. Supposed causes Installation mistake ● PCB faulty ● Trouble shooting: Shut off the power supply and turn it on 2 minutes later.
  • Page 43 9.2.2 Indoor / outdoor unit’s communication diagnosis and solution(E1) Error Code Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions seconds and this condition happens four times continuously. Supposed causes Wiring mistake ● Indoor or outdoor PCB faulty ●...
  • Page 44 Remark: Use a multi meter to test the resistance of the reactor which does not connect with capacitor. The normal value should be around zero ohm. Otherwise, the reactor must have malfunction and need to be replaced.
  • Page 45 9.2.3 Zero crossing detection error diagnosis and solution（E2） Error Code Malfunction decision The zero crossing signal time interval is not correct for continuous conditions 240s Supposed causes Indoor PCB faulty ● Troubleshooting: Check if the connections and Correct the connections. Turn on the power supply is normal? unit when the power supply is good.
  • Page 46 9.2.4 Fan speed has been out of control diagnosis and solution(E3) E3/F5 Error Code Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, conditions the unit will stop and the LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 47 Index1: 1:Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced.
  • Page 48 3. 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 49 9.2.5 Refrigerant Leakage Detection diagnosis and solution(EC) Error Code Malfunction decision Define the evaporator coil temp.T2 of the compressor just starts conditions running as Tcool. In the beginning 8 minutes after the compressor starts up, if T2 ＜Tcool－2℃ does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes, and this situation happens 3 times, the display area will show “EC”...
  • Page 50 9.2.6 Open circuit or short circuit of temperature sensor diagnosis and solution(E5) E4/E5/F1/F2/F3 Error Code Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, conditions the LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 51 9.2.7 Overload current protection diagnosis and solution(F0) Error Code Malfunction decision An abnormal current rise is detected by checking the specified conditions current detection circuit. Supposed causes Power supply problems. ● System blockage ● PCB faulty ● Wiring mistake ● Compressor malfunction ●...
  • Page 52 9.2.8 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Error Code Malfunction decision When the voltage signal that IPM send to compressor drive chip conditions is abnormal, the display LED will show “P0” and AC will turn off. Supposed causes Wiring mistake ●...
  • Page 53  IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Digital tester Normal resistance value Digital tester Normal resistance value (+)Red...
  • Page 54 9.2.9 Over voltage or too low voltage protection diagnosis and solution(P1) Error Code Malfunction decision An abnormal voltage rise or drop is detected by checking the conditions specified voltage detection circuit. Supposed causes Power supply problems. ● System leakage or block ●...
  • Page 55 9.2.10 High temperature protection of IPM or compress top diagnosis and solution (P2) Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Power supply problems. ● System leakage or block ●...
  • Page 56 High temperature protection of compressor top: Check if the air flow system Clear up the air inlet and outlet or the heat of indoor and outdoor units exchanger of indoor and outdoor units. are obstructed? Turn off the power supply and turn it on 10 minutes later.
  • Page 57 9.2.11 Inverter compressor drive error diagnosis and solution (P4) Error Code Malfunction decision An abnormal inverter compressor drive is detected by a special conditions detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Supposed causes Wiring mistake ●...
  • Page 58 Main parts check 1. Temperature sensor checking 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, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 59 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,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 2.11241 0.57683 89.5865...
  • Page 60 Appendix 2 Temperature Sensor Resistance Value Table for T5 (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5...
  • Page 61 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value ASN98D22UFZ ASM135D23UFZ ATF235D22UMT Blue - Red 1.57Ω 1.75Ω 0.75Ω Blue - Black (20℃/68℉) (20℃/68℉) (20℃/68℉) Red - Blue...

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Mrvit09asaMwvit09sMrvit09asMwvit12saMrvit12asaMwvit12s ... Show all

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