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Midea MFGA-60ARDN1-QC2 Service Manual

Floor standing type
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SERVICE MANUAL

AIRCONDITIONER
FLOOR STANDING TYPE
Model:
MFGA-60ARDN1-QC2

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Summary of Contents for Midea MFGA-60ARDN1-QC2

  • Page 1: Service Manual

    SERVICE MANUAL AIRCONDITIONER FLOOR STANDING TYPE Model: MFGA-60ARDN1-QC2...

  • Page 2: Table Of Contents

    CONTENTS Safety Precautions ......................1 Precaution..........................1 Installation ..........................1 Caution ..........................1 Operational ..........................2 Dimension ..........................3 2.1 Indoor Unit ..........................3 2.2 Outdoor Unit ..........................4 Refrigerant cycle diagram ....................5 4 . Wiring diagram ........................6 5．...
  • Page 3 Operation Modes and Functions ..................32 Other Functions ........................37 9.Characteristic of temperature sensor ................... 38 10.Trouble shooting ........................38 10.1 Protective Function ......................38 10.2 Self-diagnosis ........................40 10.3 Troubles and Solutions ..................... 40...

  • Page 4: Safety Precautions

    1. Safety Precautions 1.1 Precaution To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first. 1.2 Installation For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service center.

  • Page 5: Operational

    1.4 Operational Do not expose the skin directly to cool air for long periods of time. (Do not sit in the draft). Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air conditioner, not a precision refrigerant system.

  • Page 6: Dimension

    2. Dimension 2.1 Indoor Unit Dimension W(mm) D(mm) H(mm) Mode 1925 MFGA-60ARDN1-QC2...

  • Page 7: Outdoor Unit

    2.2 Outdoor Unit MODEL MOU-60HDN1-R 1245...

  • Page 8: Refrigerant Cycle Diagram

    3. Refrigerant cycle diagram INDOOR OUTDOOR Electronic Expansion Valve LIQUID SIDE 2-WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE REVERSING VALVE 3-WAY VALVE ACCUMULATOR COOLING COMPRESSOR HEATING...

  • Page 9: Wiring Diagram

    4 . Wiring diagram MFGA-60ARDN1-QC2 Indoor Unit Outdoor Unit...

  • Page 10: 5． ． ． ． Installation Details

    5． ． ． ． Installation details 5.1 Installation place 5.1.1 Indoor Unit a. A place which provides the spaces around the indoor unit as required above in the diagram. b. A place where is no obstacle near the inlet and outlet area. c.

  • Page 11: Installing

    a. A place full of machine oil. b. A saline place such as coast. c. Hot-spring resort. d. A place full of sulfide gas. e. A place where there are high frequency machines such as wireless installation, welding machine, medical facility. f.
  • Page 12 2. Dismounting the air-inlet grid Please take off the air-inlet grid before connecting the pipes/wires. Pull down the two knobs on the grid, take off the two screws, then the air-inlet grid goes free. 3. Take the Pipe Clip off before connecting the pipes and wiring; fit it when these finished. Use accessories to connect the pipes/wires on both sides and back side.

  • Page 13: Refrigerant Pipe Connection

    5.2.2 Outdoor Unit: 1. Ship the a/c to the installation place originally packed; 2. Be careful while hanging the unit because the center of gravity of the unit is not centralized; 3. Do not make the angle of inclination more than 45 degrees while shipping;(Avoid horizontal storage) 4.
  • Page 14 Btu/h Liquid B (m) A (m) (g/m) 5/8’’ 3/8’’ MFGA-60ARDN1-QC2 (Ф16.0) (Ф9.52) Caution: Capacity is base on standard length and maximum allowance length is base of reliability. Oil trap should be installed per 5-7 meters. 5.3.2 Piping connection 5.3.2.1 Connecting Of Refrigerant Pipe Only the correctly installing of indoor and outdoor unit done, can the refrigerant pipe be connected.
  • Page 15 should vacuum the indoor unit through the maintenance port on the cut-off valves, or open the high-pressure valve, and exhaust the air through the maintenance port on the low-pressure valve(closed). It will take about ten seconds. Then screw tightly the maintenance port.
  • Page 16 d. The bendable pipe may not be bent for more than 3 times. Bend the thin pipe a. While bending, expose the pipe by cutting the concave gap on the bending heat-insulation pipe(roll it with soft band after bent). b. To avoid pipe deformation, the radius is the bigger the better. c.
  • Page 17 Additional Outside diameter Torque tightening torque inch N.cm N.cm Ф9.52 2500 2600 Ф12.7 3500 3600 Ф16 4500 4700 Ф19 6500 6700...

  • Page 18: Installation For The First Time

    5.3.3 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below: Pressure in the system rises. ● Operating current rises. ● Cooling or heating efficiency drops. ● Moisture in the refrigerant circuit may freeze and block capillary tubing. ●...
  • Page 19 2-way and 3-way valves are set to the closed position 2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.. 3) Connect the charge hose of handle hi connection to the vacuum pump. 4) Fully open the handle Lo of the manifold valve.
  • Page 20 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. 3). Air purging Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the 2-way valve approximately 45’...
  • Page 21 Electronic scale Procedure: 1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure the liquid charge.
  • Page 22 charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7). Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage.

  • Page 23: Adding The Refrigerant After Running The System For Many Years

    5.3.4 Adding the refrigerant after running the system for many years Electronic scale Procedure: 1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve. Connect the charge hose to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge.
  • Page 24 6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low side), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7).

  • Page 25: Re-Installation While The Indoor Unit Need To Be Repaired

    5.3.5 Re-installation while the indoor unit need to be repaired 1. Collecting the refrigerant into the outdoor unit 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.
  • Page 26 6). Set the 3-way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa. Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts. Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 kgf.m. Be sure to check for gas leakage.
  • Page 27 After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve. 4). Check the gas leakage Check the flare connections for gas leakage. 5). Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2-way valve approximately 45’...

  • Page 28: Re-Installation While The Outdoor Unit Need To Be Repaired

    5.3.6 Re-installation while the outdoor unit need to be repaired 1. Evacuation for the whole system Procedure: 1). Confirm that both the 2-way and 3-way valves are set to the opened position. 2). Connect the vacuum pump to 3-way valve’s service port. 3).
  • Page 29 Electronic scale Procedure: 1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge.
  • Page 30 cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then repeat the procedure. 5).When the electronic scale displays the proper weight, disconnect the charge hose from the 3-way valve’s service port immediately. If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air conditioner before disconnecting the hose.

  • Page 31: Drain Pipe Of The Indoor Unit

    5.4 Drain Pipe of The Indoor Unit 1. Make sure the drain pipe is connected to the outdoor side downward; 2.The hard polyvinyl chloride(PVC)plastic pipe (external diameter 26 mm) sold is the market is suitable for the attached soft drain pipe; 3.Please connect the Soft Drain Pipe with the Drain Pipe, then fix it with band;...
  • Page 32 any further when it stops with a "click" sound. 2. Press the manual switch button twice until the operation indicator lights, the unit will operate on Manual Cool mode. 3. Check if all the functions works well while testing the air conditioner. Especially check whether the drainage of indoor unit is smooth or not.

  • Page 33: 6． ． ． ． External View And Display

    6． ． ． ． External view and display 6.1 External view This unit consists of indoor unit and outdoor unit. Note: All the pictures in this manual are for explanation purpose only. They may be slightly different from the air conditioner you purchased (depend on model). The actual shape shall prevail.

  • Page 34: Control Panel

    6.2 CONTROL PANEL Control Buttons and Functions 7.Operation characteristics CAUTION: 1. If air conditioner is used outside of the above conditions, certain safety protection features may come into operation and cause the unit to function abnormally. 2. Room relative humidity less than 80%. If the air conditioner operates in excess of...

  • Page 35: Electronic Function

    this figure, the surface of the air conditioner may attract condensation. Please sets the vertical air flow louver to its maximum angle (vertically to the floor), and set HIGH fan mode. 3. Optimum performance will be achieved within this operating temperature. 8.Electronic function 8.1 Main data Introduction Ts : Set temperature,...
  • Page 36 According to the capacity demand, the compressor will run at the corresponding frequency. 8.2.2.3 Indoor Fan Action Anytime remote switchover for fan speed among high/low/auto, anti-cold air function takes priority. Auto fan in heating mode 8.2.2.4 Outdoor fan In low temp. cooling zone, the outdoor fan will be controlled as below: 8.2.2.5 Anti-cold air: When evaporator coil temp.T2 is getting higher, T2>TE2, the indoor fan will run at setting speed.
  • Page 37 When T2 is getting lower, TE4<T2<TE3,the indoor fan will run at low speed. T2<TE4, the indoor fan will shut off. Setting While TE1=30, TE2=35, TE3=32, TE4=26 8.2.3 Defrost (only available to heating mode) 8.2.3.1 Condition of defrosting: The units run with T3＜-2℃ for 40 minutes 8.2.3.2 Defrosting Action:...
  • Page 38 8.2.3.3 Ending Of Defrosting Condition (Only if one of the following items is satisfied): (1) Time of defrosting lasts 10 minutes. (2) Temperature of outdoor coil T3 is up to 15°C. (3) AC has changed to other modes or shut off. 8.2.3.4 PTC function (1) Open conditions: (If all the following conditions are satisfied, the PTC will open) ¬...
  • Page 39 be closed at the first time, the compressor starts under the cooling mode. 8.2.4.2 Conditions for the compressor and outdoor fan action (Ts = set temperature) Capacity demand=(a/b/c/d)×HP×△1×△2 △1 is the factor depending on the outdoor ambient temp. △2 is the factor depending on the evaporator coil outlet temp. According to the capacity demand, the compressor will run at the corresponding frequency.

  • Page 40: Other Functions

    according to the room temperature T1 and the set temperature Ts. Condition Mode T1-Ts 2°C Cooling ≥ -1°C≤ T1-Ts<2°C T1-Ts<-1°C Heating 8.2.7 Fan Only Mode 8.2.7.1 Temperature setting function is disabled, and no setting temperature is displayed. 8.2.7.2 Under this mode, four-way valve, compressor and outdoor fan are shut down. 8.2.7.3 High/Low/Auto fan can be switched over through manual control.

  • Page 41: Characteristic Of Temperature Sensor

    9.Characteristic of temperature sensor Temp. ℃ Resistance KΩ Temp. ℃ Resistance KΩ Temp. ℃ Resistance KΩ 62.2756 14.6181 4.3874 58.7079 13.918 4.2126 56.3694 13.2631 4.0459 52.2438 12.6431 3.8867 49.3161 12.0561 3.7348 46.5725 11.5 3.5896 10.9731 3.451 41.5878 10.4736 3.3185 39.8239 3.1918 37.1988 9.5507...
  • Page 42 Condition Outdoor fan Compressor T2≤2°C（last 3 minutes） T2≥7°C 10.1.3.3 The restart of the compressor shall execute the delay protection. 10.1.4 Condenser high temperature protection 10.1.4.1 Only available to cooling and dehumidifying mode. 10.1.4.2 Action condition Condition Outdoor fan Compressor Condenser temp.≥65°C（last 3 seconds） Off Condenser temp.<52°C 10.1.4.3 Delay protection should be performed when the compressor restarts.

  • Page 43: Self-Diagnosis

    10.2 Self-diagnosis Contents Codes Evaporator low temp. protection Defrosting or anti-cold air Outdoor unit protection /outdoor temp. sensor is circuit or short circuit Communication protection between indoor and outdoor units Temp. sensor T1 is open circuit or short circuit Temp. sensor T2 is open circuit or short circuit Temp.
  • Page 44 If you still cannot solve the problem after trying the above, pull out the power plug and call the dealer. The following displays indicate an error or problem(24K): Display code Problems What to do Number Temperature Sensor is Contact service people off or short-circuit.

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