Toyotomi MTN-MTG 256DV Service Manual
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Toyotomi MTN-MTG 256DV Service Manual

Toyotomi MTN-MTG 256DV Service Manual

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MTN-MTG 256DV

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Summary of Contents for Toyotomi MTN-MTG 256DV

  • Page 1 MODEL: MTN-MTG 256DV...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution ..............................1 1.2 Warning ................................1 2. Function ..............................4 3. Dimension ..............................6 3.1 Indoor Unit ................................6 3.2 Outdoor Unit ................................ 7 4. Specification ............................. 8 5. Refrigerant cycle diagram ........................9 6.

  • Page 3: Precaution

    1. Precaution There is risk of fire, electric shock, explosion, 1.1 Safety Precaution or injury. To prevent injury to the user or other Do not install the product on a people and property damage, the following defective installation stand. It may cause injury, accident, or damage to instructions must be followed.
  • Page 4 comes from product. Turn the breaker off or Do not install the product where the disconnect the power supply cable. noise or hot air from the outdoor unit could There is risk of electric shock or fire. damage the neighborhoods. Stop operation and close the window It may cause a problem for your neighbors.
  • Page 5 cause personal injury. There is risk of fire or explosion. Do not drink the water drained from Do not recharge or disassemble the the product. batteries. Do not dispose of batteries in a fire. It is not sanitary could cause serious health They may burn of explode.

  • Page 6: Function

    2. Function Indoor unit Operation by remote controller Sensing by room temperature Room temperature sensor. Pipe temperature sensor. Room temperature control Maintain the room temperature in accordance w ith the setting temperature. Anti-freezing control in cooling Prevent the water being frozen on evaporator by sensing the evaporator pipe temperature in cooling mode Time Delay Safety control Restarting is for approx.

  • Page 7: Outdoor Unit

    Outdoor unit Power relay control The unit has 3 mins delay between continuously ON/OFF operations. Low noise air flow system Bird tail propeller fan makes the outdoor unit run more quietly. Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation.
  • Page 9 Indoor MTN A256DV Outdoor MTG A256DV Power supply Ph-V-Hz 1, 220-240V~, 50/60Hz Max. input consumption 2050 Max. current Model DA110S1C-30FZ Type Twin-Rotary DC inverter Brand GMCC Capacity 3200 Compressor Input Rated current(RLA) Thermal protector CS-74 Capacitor Refrigerant oil Model WZDK30-38G Brand Welling/Panasonic Indoor fan motor...

  • Page 10: Refrigerant Cycle Diagram

    5. Refrigerant cycle diagram...

  • Page 11: Wiring Diagram

    6. Wiring diagram 6.1 Indoor Unit 6.2 Outdoor Unit...

  • Page 12: Installation Details

    7. Installation details 7.1 Wrench torque sheet for installation Outside diameter Torque inch Kgf.m Ф6.35 Ф9.52 Ф12.7 7.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Grade Unit 7K9K12K18K 7.3 Pipe length and the elevation Standard Max.
  • Page 13 the compressor, reduce the cooling capacity, and could lead to a malfunction of unit. Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it prevents the gas leakage from the refrigeration cycle. Procedure service port.

  • Page 14: Pumping Down (Re-Installation)

    7.5 Pumping down (Re-installation) Procedure 1. Confirm that both the 2-way and 3-way valves are set to the opened position. Remove the valve stem caps and confirm that the valve stems are in the opened position. Be sure to use a hexagonal wrench to operate the valve stems. 2.

  • Page 15: Re-Air Purging (Re-Installation)

    7.6 Re-air purging (Re-installation) Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the closed position. 2. Connect the charge set and a charging cylinder to the service port of the 3-way valve. Leave the valve on the charging cylinder closed. 3.

  • Page 16: Balance Refrigerant Of The 2-Way, 3-Way Valves

    7.7 Balance refrigerant of the 2-way, 3-way valves Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the open position. 2. Connect the charge set to the 3-way valve’s service port. Leave the valve on the charge set closed. Connect the charge hose with the push pin to the service port.

  • Page 17: Evacuation

    7.8 Evacuation Procedure: 1. Connect the vacuum pump to the charge set’s centre hose. 2. Evacuation for approximately one hour. Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less]. 3. Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

  • Page 18: Gas Charging

    7.9 Gas charging Procedure: 1. Connect the charge hose to the charging cylinder. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. 2. Purge the air from the charge hose. Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant).
  • Page 19 MTN-MTG256DV Piping Length Characteristics (Cooling) Cooling Characteristics 1.50 1.56 1.46 1.52 1.42 1.48 1.38 1.44 1.34 1.40 1.30 1.36 1.32 10 11 12 13 14 25 27 29 31 33 35 37 39 41 43 Piping Length (m) Outdoor Ambient Temperature ( ) Remark: Indoor room temperature: 27/19 Remark: Indoor room temperature: 27/19 Outdoor temperature: 35...

  • Page 20: Electronic Function

    9. Electronic function 9.1 Abbreviation T1: Indoor ambient temperature T2: Pipe temperature of indoor heat exchanger T3: Pipe temperature of outdoor heat exchanger T4: Outdoor ambient temperature 9.2 Display function 9.2.1 Icon explanation on indoor display board. Run indicator This indicator illuminates when the air conditioner is on operation. Auto indicator This indicator illuminates when the air conditioner is in AUTO operation.
  • Page 21 When indoor fan speed is too low (lower than 300rpm for 50 seconds), the unit will stop and LED display error code and can’t return to normal operation automatically. 9.3.6 Protection of outdoor fan speed. When outdoor fan speed is lower than 300rpm or higher than 1500rpm for 60 seconds, the unit will stop and LED display error code and can’t return to normal operation automatically.

  • Page 22: Fan-Only Mode

    9.4 Fan-Only Mode 9.4.1 Temperature setting function is disabled, and no setting temperature display. 9.4.2 In this mode, the action of louver is the same as in cooling mode. 9.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24 setting temperature.

  • Page 23: Drying Mode

    9.5.4 Rating cooling capacity test function 1) Set the indoor unit with remote controller as: high fan, 17 in cooling mode, then press “TURBO” button on controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine will turn into rating capacity test mode, the buzzer will make a “di”...
  • Page 24 1)Anti-cold-wind function. setting fan speed low fan breeze super breeze fan stop 2)If the compressor stops caused by room temperature rising, indoor fan will be forced to run 127 seconds with breeze. During this period, anti-cold-wind is disabled. After this, anti-cold –wind function is available. 3)If the machine runs in rating capacity test mode, indoor fan runs with rating speed, and anti-cold-wind is disabled.
  • Page 25 Zone D: Compressor stops after running with F1 for 60 minutes or when ΔTh 6 . 9.7.4 Outdoor unit current control in heating mode. comp. pause I3HEAT freq. descends if curr. rises; I2HEAT freq. remains if curr. descends I1HEAT running normally 9.7.5 Indoor heat exchanger high temperature protection.
  • Page 26 compressor 4-way valve outdoor fan indoor fan indoor fan breeze 10s no longer than 10 minutes For 18K model 9.7.8 Rating heating capacity test function. 1)Set the indoor unit with remote controller as: high fan, 30 in heating mode, then press “TURBO” button on controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine will turn into rating capacity test mode, the buzzer will make a “di”...

  • Page 27: Auto Mode Function

    setting temperature. 9.7.9 Turbo function in heating mode. (press the “TURBO” button on remote controller) 1)Elevate current frequency (excluding F8) to a higher grade. If indoor fan is in low speed or pause caused by defrosting or anti-cold-wind function, frequency of compressor will not be elevated one grade until these limit has been released.
  • Page 28 9.11 Action of Electronic Expansive Valve Electronic Expansive Valve (EEV) is controlled according to the discharge temperature. Opening range of EEV is 80p~480p. EEV will be closed completely(-520p) when the unit is firstly got through the power. Then it will be at the maximum opening(480p) and the unit will be standby. EEV will be open at different initial openings after compressor’s start in different running modes.
  • Page 29 9.12 Action of outdoor fan 9.12.1 Outdoor fan is Brushless DC (BLDC) fan. 9.12.2 Outdoor fan speed can be selected among high fan, medium fan and low fan automatically according to running mode and outdoor ambient temperature. 9.12.3 Action of outdoor fan in cooling & drying mode(including cooling in auto & forced mode). (T4 is outdoor ambient temperature.) DC_FAN_HI_SPD_ADD DC_FAN_MID_SPD_ADD...

  • Page 30: Timer Function

    capacity test. 9.12.6 Action of outdoor fan in heating mode(including heating in auto mode). (T4 is outdoor ambient temperature.) DC_FAN_LOW_SPD_ADD DC_FAN_MID_SPD_ADD DC_FAN_HI_SPD_ADD 9.13 Oil return function 9.13.1 The unit will run with a higher frequency RET_OIL_FREQ2_ADD for RET_OIL_TIME2_ADD seconds when running frequency lower than RET_OIL_FREQ1_ADD for RET_OIL_TIME1_ADD minutes.

  • Page 31: Sleep Function Mode

    9.15 Sleep function mode 9.15.1 Operation time in sleep mode is 7 hours. After 7 hours the machine quits this mode and turns off. 9.15.2 In cooling, heating or auto mode sleep function is available. 9.15.3 Operation process in sleep mode is as follow: 1) After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.

  • Page 32: Troubleshooting

    10. Troubleshooting Safety Because of there are capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply, electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) Bulb (25-40W)

  • Page 33: Indoor Unit Error Display

    10.1 Indoor Unit Error Display Display LED STATUS EEPROM parameter error Indoor / outdoor units communication protection Indoor fan speed out of control Open or short circuit of outdoor temperature sensor Open or short circuit of room or evaporator temperature sensor Outdoor fan speed out of control Inverter module (or IGBT) over-strong current protection Over voltage or too low voltage protection...

  • Page 34: Diagnosis And Solution

    10.2 Diagnosis and Solution 10.2.1 E0(EEPROM parameter error) error diagnosis and solution Circuit or software error on indoor PCB Replace indoor PCB 10.2.2 E1(indoor / outdoor units communication protection) error diagnosis and solution Disconnect the power supply, after 1 minute, connect the power supply , turn on the unit with remote controller Does the unit work normally?
  • Page 35 10.2.4 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution. Is the outdoor temperature Repair the connector and sensor connector and reconnect connection good? Replace the sensor and Replace outdoor e-box check if E5 display again? 10.2.5 E6(open or short circuit of room or evaporator temperature sensor) diagnosis and solution. Is the indoor temperature and evaporator sensor Repair the connector and...
  • Page 36 10.2.8 P1(over voltage or too low voltage protection) diagnosis and solution. Be sure the power supply is Is the power supply good? normal when using the units Replace the outdoor e-box. 10.2.9 P2(temperature protection of compressor top) diagnosis and solution. Is the connection Does compressor Reconnect and retest.

  • Page 37: Key Parts Checking

    10.3 Key parts checking. 10.3.1. Compressor checking (Model: DA110S1C-30FZ). Measure the resistance value of each winding by using the multi-meter. Position Resistance Value Blue - Red 0.80Ω (20 ) Blue - Black Red - Blue 10.3.2 Step Motor (Model: MP2423F). Measure the resistance value of each winding by using the multi-meter.
  • Page 38 10.3.3 Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor exhaust temp.(Te) sensor. Measure the resistance value of each winding by using the multi-meter. Some frequently-used R-T data for T1,T2,T3 and T4 sensor: Temperature ( ) Resistance Value (KΩ) 26.9...

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