Midea MUBU-12HRFN1-M Service Manual
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Midea MUBU-12HRFN1-M Service Manual

Midea MUBU-12HRFN1-M Service Manual

Light commercial mono 3d air conditioner
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Revision A: 1507070001.

Table of Contents

1.
2.
Part Names And Functions
3.
4.
5.
6.
7.
8.
9.
14. Solar Panel
WARNING
Installation MUST conform with local building codes or, in the absence of local codes, with the
National Electrical Code NFPA70/ANSI C1-1993 or current edition and Canadian Electrical
Code Part1 CSA C.22.1.
The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments
Installation or repairs made by unqualified persons can result in hazards to you and others.
Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury and/or death.
This service is only for service engineer to use.
Light commercial MONO 3D Air
Conditioner
SERVICE MANUAL
Model Numbers:
Indoor Unit:
MUBU-12HRFN1-M(C); MUEU-18HRFN1-M(C)
MUBU-18HRFN1-M(C); MCA3U-18HRFN1-M(C);
MUEU-24HRFN1-M(C); MCD-24HRFN1-M(C)
MUE-36HRFN1-M(C); MCD-36HRFN1-M(C)
MUE-48HRFN1-M(C); MCD-48HRFN1-M(C)
Outdoor Unit:
MOZ-12HFN1-MU5W; MOF-18HFN1-MT0W;
MOF-17HFN1-MT0W; MOY-23HFN1-MT0W;
MOU-36HFN1-M(C); MOU-48HFN1-M(C)
Mono DC

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Summary of Contents for Midea MUBU-12HRFN1-M

  • Page 1: Table Of Contents

    Light commercial MONO 3D Air Conditioner Mono DC SERVICE MANUAL Revision A: 1507070001. Model Numbers: Table of Contents Indoor Unit: Precaution MUBU-12HRFN1-M(C); MUEU-18HRFN1-M(C) Part Names And Functions MUBU-18HRFN1-M(C); MCA3U-18HRFN1-M(C); Dimension MUEU-24HRFN1-M(C); MCD-24HRFN1-M(C) Service space MUE-36HRFN1-M(C); MCD-36HRFN1-M(C) Refrigerant Cycle Diagram MUE-48HRFN1-M(C); MCD-48HRFN1-M(C)
  • Page 2 CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution .......................... 1 1.2 Warning ............................1 2. Part Names and Features..........................4 2.1 Model Names of Indoor/Outdoor units ..................4 2.2 Part names of Indoor/Outdoor units ....................5 2.3 Features ............................7 3.
  • Page 3 14.4 Operation Modes and Functions ....................54 16. Troubleshooting ............................58 16.1 Indoor Unit Error Display ......................59 16.2 Outdoor unit error display ......................60 16.3 Diagnosis and Solution ......................64 16.4 Main parts check ........................78 17. Disassembly Instructions ........................85 17.1 Indoor unit ..........................

  • Page 4: Precaution

     Be caution when unpacking and installing the product. 1. Precaution Sharp edges could cause injury, be especially careful of the case edges and the fins on the 1.1 Safety Precaution condenser and evaporator.  For installation, always contact the ...
  • Page 5   If strange sounds or smoke comes Install the drain hose to ensure that from product, turn the breaker off or water is drained away properly. disconnect the power supply cable. A bad connection may cause water leakage.  There is risk of electric shock or fire.
  • Page 6  Do not insert hands or other objects through air inlet or outlet while the product 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.

  • Page 7: Part Names And Features

    2. Part Names and Features 2.1 Model Names of Indoor/Outdoor units Outdoor units Series Capacity Indoor units Ceiling-floor MUBU-12HRFN1-M(C) MOZ-12HFN1-MU5W Ceiling-floor MUBU-18HRFN1-M(C) MOF-18HFN1-MT0W Cassette MCA3U-18HRFN1-M(C) Ceiling-floor MUEU-24HRFN1-M(C) MOY-23HFN1-MT0W Cassette MCD-24HRFN1-M(C) Ceiling-floor MUE-36HRFN1-M(C) MOU-36HFN1-M(C) Cassette MCD-36HRFN1-M(C) Ceiling-floor MUE-48HRFN1-M(C) MOU-48HFN1-M(C) Cassette MCD-48HRFN1-M(C)

  • Page 8: Part Names Of Indoor/Outdoor Units

    2.2 Part names of Indoor/Outdoor units Ceiling-floor Units...
  • Page 9 Cassette Unit...

  • Page 10: Features

    2.3 Features 2.3.1 Ceiling-floor Units 2.3.1.1 Two-way installation  The rounded design of the ceiling and floor type air conditioner allows either ceiling or floor-level installation. Ceiling installation saves room space, while floor installation helps prevent the loss of warm air.
  • Page 11 2.3.1.4 Optional drainage pipe connection  Both right side and left side drainage holes are available to avoid the space limitation for drainage pipe installation. Make you more convenient during installation. C Panel (LED display) D Panel 2.3.1.5 Convenience operating and easy maintenance ...
  • Page 12 2.3.2 Cassette Unit 2.3.2.1 Lower Noise  Optimize air channel system design to ensure the maximum quietness and comfort.  Noise max down 6dB. 2.3.2.2 Turbo mode (Optional)  Turbo function can boost cooling or heating speed in a short period, and makes the room cool down or heat up rapidly.
  • Page 13 2.3.2.6 Build-in Drain Pump  The drain pump can lift the condensing water up to 750mm upmost.  It’s convenient to install drainage piping under most space condition. 2.3.2.7Terminals for alarm lamp and long-distance on-off controller connection are standard  Reserve terminals for the connection of alarm lamp and long-distance on-off controller, more human control.

  • Page 14: Dimension

    3. Dimension 3.1 Indoor Unit Ceiling-floor Units (18K) Refrigerant pipe hole (optional) Hanging arm (Ceiling Installation) （ for ceiling) (Floor Installation) Hanging arm （ for Floor ） Refrigerant pipe hole (optional) Capacity (Btu/h) MUBU-18HRFN1-M(C) inch 38.98 19.88 35.71...
  • Page 15 Ceiling-floor Units (18K-48K) Wiring connection port Drain discharge port Fresh air intake Refrigerant pipe hole Hanging arm Capacity (Btu/h) MUEU-18HRFN1-M(C) 1068 inch 42.05 26.57 9.25 38.70 1285 1200 inch 50.59 26.57 9.25 47.24 1650 1565 inch 64.96 26.57 9.25 61.61...
  • Page 16 Cassette Units (12K, 18K) Liquid side Gas side Body Drain hole Wiring connection port ( for Service ) E-parts box 150 Distribution duct 4-Screw hole (for install panel) 4-install hanger Drain pipe Fresh air intake Wiring connection port Panel...
  • Page 17 Cassette Units (24K, 36K, 48K) 92 92 Fresh air intake 4-install hanger Body Gas side Liquid side Wiring connection port E-parts box Service hole for Test mouth & Test cover draining pump Drain hole 92 92 92 92 Panel Capacity (Btu/h) inch 6.30 2.95...

  • Page 18: Outdoor Unit

    3.2 Outdoor Unit Note: The above drawing is only for reference. The appearance of your units may be different. Model MOZ-12HFN1-MU5W inch 31.89 21.61 12.8 13.78 12.01 12.2 21.97 MOF-18HFN1-MT0W MOF-17HFN1-MT0W inch 33.27 22.05 13.19 14.17 12.28 2.87 27.56 MOY-23HFN1-MT0W inch 37.20 25.20...

  • Page 19: Service Space

    4. Service Space 4.1 Indoor Unit Ceiling-floor Units Cassette Units Unit: mm...

  • Page 20: Outdoor Unit

    4.2 Outdoor Unit (Wall or obstacle) More than 30cm(11.81in) Air inlet More than 60cm More than 30cm (23.62in) (11.81in) Maintain channel More than 60cm Air inlet (23.62in) Air outlet More than 200cm(78.74in)

  • Page 21: Refrigerant Cycle Diagram

    5. Refrigerant Cycle Diagram INDOOR OUTDOOR Electronic CAPILIARY TUBE expansion valve LIQUID SIDE 2-WAY VALVE T3 Condenser temp. sensor HEAT EXCHANGE (EVAPORATOR) HEAT T4 Ambient T1 Room temp. T2 Evaporator EXCHANGE temp. sensor sensor temp. sensor (CONDENSER) middle T2B Evaporator temp.

  • Page 22: Wiring Diagram

    6. Wiring Diagram 6.1 Indoor Unit MUBU-12HRFN1-M(C), MUBU-18HRFN1-M(C), MUEU-18HRFN1-M(C), MUEU-24HRFN1-M(C) MUE-36HRFN1-M(C)
  • Page 23 MUE-48HRFN1-M(C) MCA3U-18HRFN1-M(C) MCD-24HRFN1-M(C)

  • Page 24: Outdoor Unit

    MCD-36HRFN1-M(C), MCD-48HRFN1-M(C) 6.2 Outdoor Unit MOZ-12HFN1-MU5W...
  • Page 25 MOF-18HFN1-MT0W MOF-17HFN1-MT0W...
  • Page 26 MOY-23HFN1-MT0W MOU-36HFN1-M(C)
  • Page 27 MOU-48HFN1-M(C)
  • Page 28 PCB board of MOZ-12HFN1-MU5W For MOF-18HFN1-MT0W power supply 290-330VDC (standby) 208-230V AC 210-300VDC (Running) connect to the terminal Fuse 250V30A connect to DR module connect to earth connect to reactance Earth CN6-1 [1.0] 2014-7-5 L-IN CN22 DSA1 CN21 CN12 REACTOR CN60/CN1，CN4 connect to 4-way valve 65T 250V30A...
  • Page 29 For MOF-17HFN1-MT0W...
  • Page 30 For MOY-23HFN1-MT0W,...
  • Page 31 For MOU-36HFN1-M(C) Connect to the Indoor evap.pipe out temp. sensor T2B-A、T2B-B、T2B-C、T2B-D、T2B-E external drive DC fan 6 5 4 3 2 1 motor connector Electric Expansion testPort Electric Expansion Electric Expansion Electric Expansion Electric Expansion external drive DC fan external drive DC fan Value Value Value...
  • Page 32 For MOU-48HFN1-M(C)

  • Page 33: Electric Characteristics

    7. Electric Characteristics Indoor Unit Model Voltage Min. Max. MUBU-12HRFN1-M(C) 208-230V 187V 253V MUBU-18HRFN1-M(C) 208-230V 187V 253V MUEU-24HRFN1-M(C) 208-230V 187V 253V MUE-36HRFN1-M(C) 208-230V 187V 253V MUE-48HRFN1-M(C) 208-230V 187V 253V MCA3U-18HRFN1-M(C) 208-230V 187V 253V MCD-24HRFN1-M(C) 208-230V 187V 253V MCD-36HRFN1-M(C) 208-230V 187V...

  • Page 34: Outdoor Unit

    1.4m Microphone Noise level dB(A) Model MCA3U-18HRFN1-M(C) MCD-24HRFN1-M(C) MCD-36HRFN1-M(C) MCD-48HRFN1-M(C) 8.2 Outdoor unit Outdoor Unit Microphone 1.0m Note: H= 0.5 × height of outdoor unit Model Noise Level dB(A) MOZ-12HFN1-MU5W MOF-17HFN1-MT0W MOF-18HFN1-MT0W MOY-23HFN1-MT0W MOU-36HFN1-M(C) MOU-48HFN1-M(C)

  • Page 35: Accessories

    9 Accessories Ceiling-floor Units 1. Remote controller Remote controller & Its 2. Remote controller holder holder 3. Mounting screw (ST2.9× 10-C-H) 4. Alkaline dry batteries (AM4) 5. Owner's manual Others 6. Installation manual 7. Remote controller manual...
  • Page 36 Cassette Units Name Shape Quantity Installation Fittings Installation paper board Tubing & Fittings Soundproof / insulation sheath Out-let pipe sheath Out-let pipe clasp Drainpipe Fittings Drain joint Seal ring Remote controller & Its Frame Remote controller & Its Remote controller holder Frame(The product you have might not be provided the following...

  • Page 37: The Specification Of Power

    10 The Specification of Power Type 12K, 18K Phase 1-phase 1-phase Power Frequency and Voltage 208-230V, 60Hz 208-230V, 60Hz Circuit Breaker/ Fuse (A) 25/20 40/30 Indoor Unit Power Wiring (mm Ground Wiring Indoor/Outdoor Outdoor Unit Power Wiring 3×2.5 3×2.0 Connecting Strong Electric Signal 4×1.0 4×1.5...
  • Page 38 11 Field Wiring 12K-24K 36K, 48K...

  • Page 39: Installation Details

    blockage of the heat exchanger in the 12 Installation Details outdoor unit.  If is built over the unit to prevent direct sunlight, rain exposure, direct strong wend, 12.1 Location selection snow and other scraps accumulation, make Indoor unit location selection 12.1.1 sure that heat radiation from the condenser ...
  • Page 40 3.4.1Install the pendant bolt ① Ceiling installation Locate the hanging arm on the hanging screw bolt. Select the position of installation hooks according Prepare the mounting bolts on the unit. to the hook holes positions showed in upper picture. Drill four holes of Ø12mm, 45~50mm deep at the selected positions on the ceiling.
  • Page 41 12.2.2 Compact cassette indoor unit installation 12.2.2.1 Service space for indoor unit Face the concave side of the installation hooks toward the expansible hooks. Determine the length of the installation hooks from the height of ceiling, then cut off the unnecessary part. If the ceiling is extremely high, please determine the length of the installation hook depending on the real situation.

  • Page 42: Outdoor Unit Installation

    Locate the air conditioner firmly by wrenching the nuts after having adjusted the body's position well. Tighten the screws under the panel hooks till the panel closely stick on the ceiling to avoid condensate water. 12.2.2.5 Install the panel Remove the grille Hang the air-in grill to the panel, then connect the lead terminator of the swing motor and that control...

  • Page 43: Refrigerant Pipe Installation

    Fasten the feet of this unit with bolts firmly to (Wall or obstacle) prevent it from collapsing in case of earthquake or strong wind. More than 30cm(11.81in) Air inlet More than 30cm (11.81in) Maintain channel More than 60cm Air inlet (23.62in) Air outlet More than 200cm(78.74in)
  • Page 44 may cause leakage. Refer the following table for different pipe connection. Insulate the copper pipe  Before test operation, the joint parts should not be heat insulated. Flare the pipe  Insert a flare nut into the pipe before flaring Torque Sketch map Pipe...
  • Page 45 1) Completely tighten the flare nuts of the Procedure: indoor and outdoor units, confirm that both 1). Confirm that both the 2-way and 3-way the 2-way and 3-way valves are set to the valves are set to the closed position. closed position.
  • Page 46 1). Connect the charge hose to the 3-way 1). Confirm that both the 2-way and 3-way service port, open the 2-way valve and the valves are set to the opened position 3-way valve. Remove the valve stem caps and confirm that Connect the charge hose to the valve at the the valve stems are in the opened position.
  • Page 47 Open the valves on the charging cylinder and 3). Evacuation for approximately one hour. the charge set. Purge the air by loosening the Confirm that the compound meter indicates flare nut on the 2-way valve approximately 45’ -0.1Mpa (14.5Psi). for 3 seconds then closing it for 1 minute; repeat 4).

  • Page 48: Drainage Pipe Installation

    5).When the electronic scale displays the proper weight, disconnect the charge hose from the 3-way valve’s service port immediately According to the above table to calculate the If the system has been charged with liquid refrigerant while operating the air conditioner, total water flowrate for the confluence pipe turn off the air conditioner before disconnecting selection.
  • Page 49  In general, the supporter gap of the drainage pipe horizontal pipe and vertical Indoor unit pipe is respectively 1m~1.5m (3.28~4.92ft) More than 50mm and 1.5m~2.0m(4.95~6.56ft). Plug  More than 25mm Each vertical pipe shall be equipped with not less than two hangers. Water storage pipe ...
  • Page 50 12.5.3 Drainage test 12.5.3.1. Water leakage test After finishing the construction of drainage pipe system, fill the pipe with water and keep it for 24 hours to check whether there is leakage at joint section. 12.5.3.2. Water discharge test Natural drainage mode (the indoor unit without drainage pump) Infuse above 600ml water through water test hole slowly into the water collector, observe...

  • Page 51: Vacuum Drying And Leakage Checking

    Continuously infusing water until water Due to different construction environment, two level alarmed, check whether the drainage kinds of vacuum drying ways could be chosen, pump could discharge water at once. If namely ordinary vacuum drying and special water level does not decline under warning vacuum drying.

  • Page 52: Additional Refrigerant Charge

    Note:  Refrigerant may only be charged after Procedures of special vacuum drying are as performed the vacuum drying process. follows:  Always use gloves and glasses to protect  Vacuum drying for 1 hour. your hands and eyes during the charge ...

  • Page 53: Engineering Of Electrical Wiring

     The burning performance should over The temperature of condensate drainage water 120℃ is very low. If insulation is not enough, it shall  According to the local law to choose form dew and cause leakage to damage the insulation materials ...

  • Page 54: Test Operation

      Do not use metal wire tube at the place with Whether the drainage is normal.  acid or alkali corrosion, adopt plastic wire Whether there is vibration or abnormal tube to replace it. noise during operation.  There must be not wire connect joint in the Outdoor unit wire tube If joint is a must, set a connection ...

  • Page 55: Operation Characteristics

    13. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode 0℃～30℃ 10℃～32℃ Room temperature 17℃～32℃(62℉～90℉) (32℉～86℉) (50℉～90℉) 0℃～50℃ (32℉～122℉) -15℃～30℃ 0℃～50℃ （-15℃～50℃(5℉～122℉)：For Outdoor temperature (5℉～86℉) (32℉～122℉) 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 56: Electronic Function

    1 minute delay for the 1 time stand-up and 3 14. Electronic Function minutes delay for others. 14.1 Abbreviation 14.3.2 Temperature protection T1: Indoor room temperature compressor top T2: Coil temperature of indoor heat exchanger The unit will stop working when the compressor middle.

  • Page 57: Operation Modes And Functions

    14.3.7 Compressor preheating functions (4) The louver operates same as in cooling Preheating permitting condition: mode. If T4＜3℃(37.4° F) and the machine connects (5) Auto fan: to power supply newly within 5 seconds or if T4 T1-24° C(75.2° F) ＜3℃(37.4° F) and compressor has stopped for over 3 hours, the compressor heating cable will 6.0°...
  • Page 58 If any one of the following items is satisfied, AC T1-Td will enter the defrosting mode. After the compressor starts up and keeps 6.0° C(42.8° F) (H-L)*0.75+L running, mark the minimum value of T3 from 5.0° C(41.0° F) (H-L)*0.5+L the 10th minutes to 15th minutes as T30. 4.0°...
  • Page 59 14.4.6.5 Timer off/on. The machine will turn off Decrease: Decrease the running frequency to automatically when reaching the setting “off” the lower level. time, and then turn on automatically when reaching the setting “on” time. Hold: Keep the current frequency. 14.4.6.6 The timer function will not change the Resume: No limitation for frequency.
  • Page 60 results from pressing the FOLLOW ME button 1. When the A/C operates with cooling on remote controller or wired remote controller, (including auto cooling), dehumidifying, and the buzzer will emit a sound and this indicates forced cooling mode, the pump will start the follow me function is initiated.

  • Page 61: Troubleshooting

    16. 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 62: Indoor Unit Error Display

    16.1 Indoor Unit Error Display Operation Timer lamp Display LED STATUS lamp ☆ 1 time Indoor unit EEPROM error Communication malfunction between indoor and ☆ 2 times outdoor units. ☆ 4 times Indoor fan speed has been out of control Indoor room temperature sensor T1 open circuit or short ☆...

  • Page 63: Outdoor Unit Error Display

    16.2 Outdoor unit error display For 9K-24K outdoor unit: LED2 LED1 Problems IU display (Green) (Red) standby for normal Operation normally ☆ Compressor drive board EEPROM error ☆ IPM malfunction or IGBT over-strong current protection Over voltage or too low voltage protection ☆...
  • Page 64 For 36K-48K Outdoor Unit Problems Error Code Communication malfunction between indoor and outdoor units. Protection of over-current Open circuit or short circuit of outdoor ambient temperature sensor T4 Open circuit or short circuit of condenser coil temperature sensor T3 Open circuit or short circuit of Compressor discharge temperature sensor T5 Outdoor unit EEPROM error Outdoor fan speed has been out of control...
  • Page 65 Condenser pipe temperature(T3) If the temperature is lower than -9 degree, the digital display tube will show “-9”.If the temperature is higher than 70 degree, the digital display tube will show “70”. If the indoor Outdoor ambient temperature(T4) unit is not connected, the digital display tube will show: “――”...
  • Page 66 Evaporator pipe temperature T2 of 1# indoor If the temperature is lower than 0 degree, the digital display tube will show “0”.If the temperature is higher than 70 unit degree, the digital display tube will show “70”. If the indoor Evaporator pipe temperature T2 of 2# indoor unit is not connected, the digital display tube will show:...

  • Page 67: Diagnosis And Solution

    16.3 Diagnosis and Solution 16.3.1 EEPROM 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: Power off, then restart the unit 2 minutes later.
  • Page 68 16.3.2 Communication malfunction between indoor and outdoor units diagnosis and solution (E1) Error Code Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions 110 seconds and this condition happens four times continuously. Supposed causes Wiring mistake ●...
  • Page 69 Remark: Use a multimeter to test the DC voltage between L2 port and S port of outdoor unit. The red pin of multimeter connects with L2 port while the black pin is for S port. When AC is normal running, the voltage will move alternately between -50V to 50V.
  • Page 70 16.3.3 Fan speed has been out of control diagnosis and solution (E3) 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. Wiring mistake ●...
  • Page 71 Index 1: 1. Indoor DC fan motor(control chip is inside 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 have problems and need to be replaced.
  • Page 72 16.3.4 Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3) 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 73 16.3.5 Refrigerant Leakage Detection diagnosis and solution (EC) Error Code Malfunction decision Define the evaporator coil temperatureT2 of the compressor just conditions starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 ＜Tcool－2℃ does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...
  • Page 74 Water-level alarm malfunction 16.3.6 diagnosis and solution Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the conditions failure. ● Wiring mistake ● Water-level switch faulty Supposed causes ● Water pump faulty ● Indoor PCB faulty Power off, then restart the unit 3 minutes Power off, then restart the unit 3 minutes later.
  • Page 75 16.3.7 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 is abnormal, the display LED will show “P0” and AC will turn off. conditions Wiring mistake;...
  • Page 78 16.3.8 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. Power supply problems. ● Supposed causes System leakage or block ●...
  • Page 79 16.3.9 High temperature protection of compressor top diagnosis and solution (P2) Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Power supply problems. ● Supposed causes System leakage or block ● PCB faulty ●...
  • Page 80 16.3.10 Inverter compressor drive error diagnosis and solution(P4) Error Code An abnormal inverter compressor drive is detected by a special Malfunction decision detection circuit, including communication signal detection, conditions voltage detection, compressor rotation speed signal detection and so on. Wiring mistake; IPM malfunction; Outdoor fan ass’y faulty Supposed causes Compressor malfunction;...

  • Page 81: Main Parts Check

    16.4 Main parts check 1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temperature(T1) sensor, Indoor coil temperature(T2) sensor, Outdoor coil temperature(T3) sensor, Outdoor ambient temperature(T4) sensor, Compressor discharge temperature(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 82 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (℃--K) ℃ ℉ ℃ ℉ ℃ ℉ ℃ ℉ K Ohm K Ohm K Ohm 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 83 Appendix 2 Temperature Sensor Resistance Value Table for T5 (℃--K) ℃ ℉ ℃ ℉ ℃ ℉ ℃ ℉ K Ohm K Ohm K Ohm 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 57.37...
  • Page 84 Appendix 3: ℃ 10 11 12 13 14 15 16 17 18 19 20 21 22 ℉ 48 50 52 54 56 58 60 62 64 66 68 70 72 ℃ 23 24 25 26 27 28 29 30 31 32 33 34 35 ℉...
  • Page 85 2. Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value ASM108D1UFZA ASM135D23UFZ DA250S2C-30MT TNB306FPGMC-L MNB36FAAMC-L Blue - Red 1.81Ω 1.75Ω 0.55Ω 0.53Ω 0.44Ω Blue - Black (20℃/68℉) (20℃/68℉) (20℃/68℉) (20℃/68℉) (20℃/68℉) Red - Blue...
  • Page 86 3. 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 87 Heating Chart: HEATING MODE Outdoor temperature ℉ Indoor (℃) Temperature 57 (13.89) 47 (8.33) 37 (2.78) (-2.78) (-8.33) 30.3 28.5 25.3 22.8 20.8 32.5 30.0 26.6 25.4 23.3 33.8 31.5 27.8 26.3 24.9 3.03 2.85 2.53 2.28 2.08 3.25 3.00 2.66 2.54 2.33...

  • Page 88: Disassembly Instructions

    17. Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine. 17.1 Indoor unit  Ceiling-floor Unit Parts name Procedures Remarks Remove 1) Open the air return the Filter grille 2) Remove the filter from the grille ...
  • Page 89 Remove 1) Take out the Repeat the operation of step1, step2 and step3 of No2. the PCB electronic control box from the body and remove its cover 2) Disconnect all the wires of plugs connected to the 3) Remove the PCB Each corner has a fixing pin from the fixing pins...
  • Page 90 2) Remove the fan motor wire from the PCB of outer driver DC motor Fan motor wire 3) Remove the stickers stick to the volute Stickers shell 4) Remove the below volute shell Press Press the clips to take off the volute shell 5) Disassemble the fan motor fixing clamps The fan motor assembly...
  • Page 91 4) Remove the front panel assembly by screwing of the fixing screws Each side has five screws 4 screws Repeat the operation of No.6 to remove the front panel Remove 1) Remove the front assembly the air panel assembly outlet grille 2) Remove the air 6 clips assembly...
  • Page 92 motor 2) Screw off the screws to remove the motor 3 screws Repeat the operation of No.6 to remove the front panel Remove 1) Remove the front assembly the water panel assembly collector 2) Screw off the fixing 4 screws screws to disassemble the water collector...
  • Page 93  Cassette Unit Parts name Procedures Remarks Remove the 4) Open the grille filter Grill switch 5) Remove the filter Note: the filter is easy to be damaged, be careful when removing it. Remove the 5) Open the grille Repeat the operation of step1 of No.1 panel 6) Remove the grille ...
  • Page 94 board cover(4 screws)  Remove the display board(4 screws) 4 screws Remove the 1) Remove the panel Repeat the operation of step1,2,3 of No.2 swing 2) Screw off 3 screws to motor remove the swing motor assy. 3 screws 3) Screw off 1 screws to remove the swing motor.
  • Page 95 3) Pull out all the Indoor fan Pump Water lever Temperature connection wires to other parts, then the PCB can sensors be replaced. Swing motor Power Input Display board 4) There are 2 buckles fixing the PCB. To draw out the PCB, you should open them.
  • Page 96 3) Remove the fixing nut to disassemble the fan wheel 4) Pull out the fan wheel Remove the 1) Repeat the operation of fan motor No.6 2) Remove the fixing board of fan motor wire 3 nuts 3) Remove the 5 screws to disassemble the fan motor 5 screws...
  • Page 97 assembly 3) Screw off the 4 screws inside 4 holes (1 is under a protection cover) to remove the water collecting assembly. 4) Take out the water collecting assembly Remove the 1) Remove the panel Repeat the operation of No.2 draining 2) Remove the electronic Repeat the operation of No.6...
  • Page 98 6) There are 2 screws under the supporter to fixing the pump. Release them to take the pump out of the supporter. Remove the 1) Remove the water Repeat the operation of No.9 evaporator collecting assembly 2) Remove the seal board of evaporator 3 screws 3) Remove the evaporator...

  • Page 99: Outdoor Unit

    17.2 Outdoor unit  9K and 12K Outdoor Unit Part name Procedures Remarks Panel plate How to remove the panel Screws of top panel plate. 1) Stop operation of the air conditioner and turn “OFF” the power breaker. 2) Refer to the right side photos, find out the fixing screws of the panels.
  • Page 100 Screw of top panel Screws of front panel Screws of left plate Fan ass’y How to remove the fan Solar panel controller box Electronic control box ass’y. Fan ass’y 1) After remove the panel plate following procedure Reactor 1, remove the hex nut fixing the fan and then Compressor and remove the fan.
  • Page 101 Fan motor connector 3) Disconnect the connector for fan motor from the electronic control board. 4) Remove the four fixing screws of the fan motor. 5) Then remove the fan Four motor. screws Electrical remove Solar panel controller box Electronic control box parts electrical parts.
  • Page 102 Reactor connector Electrical heater connector 2) Release the connector of the reactor. Compressor connector Two blue wires of four way valve 3) Pull out the two blue wires connected with the four way valve. 4) Pull out connectors of compressor temperature sensor, condenser...
  • Page 103 5) Remove the ground wires. 6) Remove the power supply wires (L1, L2, S). Then remove electronic control box. Four-way How to remove the valve four-way valve. The picture of four-way valve may be different from 1) Perform work of item 1, the one on your side.
  • Page 104 Compressor How to remove the compressor. 1) After perform work of item1,2,3. 2) Remove the discharge pipe and suction pipe Discharge with a burner. pipe and 3) Remove the hex nuts suction and washers fixing the pipe compressor on bottom plate.

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