Mitsubishi Electric Mr.Slim MSZ09UN Service Manual
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Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

Split-type, heat pump air conditioners, wireless type
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

Wireless type
Models
MSZ09UN
MUZ09UN
MUZ12UN
Revision A:
Please void OB297.
· MUZ09UN
(W)
· MUZ12UN
(W)
CONTENTS
1. FEATURES ·························································2
2. PART NAMES AND FUNCTIONS······················4
3. SPECIFICATION·················································6
4. DATA···································································8
5. OUTLINES AND DIMENSIONS ·······················18
6. WIRING DIAGRAM ··········································20
Remote
7. REFRIGERANT SYSTEM DIAGRAM ··············22
controller
8. MICROPROCESSOR CONTROL ····················23
9. SERVICE FUNCTIONS ····································39
10. TROUBLESHOOTING······································41
11. DISASSEMBLY INSTRUCTIONS·····················61
12. PARTS LIST······················································68
13. OPTIONAL PARTS···········································74
C
US
Conditions of operation frequency have been added.
The Slim Line.
From Mitsubishi Electric.
No. OB297
REVISED EDITION-A
TM

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Summary of Contents for Mitsubishi Electric Mr.Slim MSZ09UN

  • Page 1: Service Manual

    6. WIRING DIAGRAM ··········································20 MSZ09UN Remote 7. REFRIGERANT SYSTEM DIAGRAM ··············22 INDOOR UNIT controller 8. MICROPROCESSOR CONTROL ····················23 9. SERVICE FUNCTIONS ····································39 10. TROUBLESHOOTING······································41 11. DISASSEMBLY INSTRUCTIONS·····················61 12. PARTS LIST······················································68 13. OPTIONAL PARTS···········································74 The Slim Line. From Mitsubishi Electric. MUZ09UN MUZ12UN OUTDOOR UNIT...
  • Page 2 Revision A: • Conditions of operation frequency have been added. • SPECIFICATION, DATA, WIRING DIAGRAM and PARTS LIST have been partially modified. FEATURES Optimum comfort year-round Inverter Model To ensure that a room is never too cold or too hot, inverter technology Constant temperature is maintained by compressor speed control.
  • Page 3 It has a liquid crystal display which indicates such information as mode, fan speed and temperature selected as well as the programmed ON/OFF timer. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric fea- ture that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that describes present conditions : “Too Cool”...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS INDOOR UNIT MSZ12UN MSZ09UN Grille Deodorizing filter(option) Air inlet (gray sponge type) Air cleaning filter(option) (white bellows type) Remote control receiving section Front panel Horizontal vane Air filter Vertical vanes Remote controller Operation section (When the grille is opened) MSZ09UN MSZ09UN Operation indicator lamp...

  • Page 5: Remote Controller

    ACCESSORIES MSZ09UN MSZ12UN Installation plate Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.) Remote controller mounting hardware Fixing screw for 3 3.5 x 16 mm(0.14 x 0.63 in.) (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) REMOTE CONTROLLER MSZ09UN...
  • Page 6 SPECIFICATION Model MSZ09UN MSZ12UN Item Capacity Cooling 8,800(2,600~9,700) 11,400(2,900~13,000) Btu/h Rated(Minimum~Maximum) Heating 47 12,300(2,300~15,700) 16,000(2,400~19,500) Btu/h Capacity Rated Heating 17 10,000 11,600 Btu/h Power consumption Cooling 980(290~1,250) 1,140(290~1,460) Rated(Minimum~Maximum) Heating 47 1,320(280~1,770) 1,590(280~2,050) Power consumption Rated Heating 17 1,420 1,760 [SEER] 9.0 [12.0] 10.0[13.0]...
  • Page 7 Test condition (Unit : [˚F]) Indoor air condition Outdoor air condition Mode Test Wet bulb Wet bulb Dry bulb Dry bulb SEER "A" Cooling Steady State (75) (Cooling) at rated compressor Speed "B-2" Cooling Steady State (65) at rated compressor Speed "B-1"...

  • Page 8: Performance Data

    DATA MSZ09UN MUZ09UN MSZ12UN MUZ12UN 4-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature ( ˚F ) Model ( ˚F ) 0.87 10.1 0.96 1.03 1.08 1.13 10.8 MSZ09UN 0.82 0.91 0.98 1.04 1.09 10.2 0.78 0.87 0.94 1.00...
  • Page 9 4-2. PERFORMANCE CURVE How to operate with fixed operational frequency of the compressor. 1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner. 2.
  • Page 10 How to operate with fixed operational frequency of the compressor. 1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner. 2.
  • Page 11 4-3. Condensing pressure How to operate with fixed operational frequency of the compressor. 1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner. 2.
  • Page 12 MSZ12UN Data is based on the condition of indoor humidity 50%. (Cooling) Air flow should be set to High speed. (PSIG) (PSIG) 68 70 100 104(°F) 68 70 100 104(°F) Outdoor ambient temperature Outdoor ambient temperature MSZ12UN Data is based on the condition of outdoor humidity 75%. (Heating) Air flow should be set to High speed.

  • Page 13: Standard Operation Data

    4-4. STANDARD OPERATION DATA Model MSZ09UN MSZ12UN Item Unit Cooling Heating Cooling Heating Capacity Btu / h 8,800 12,300 11,400 16,000 — 0.70 – 0.73 – Total Input 1,320 1,140 1,590 Rated frequency Indoor unit MSZ09UN MSZ12UN Power supply (V, phase, Hz) 115, 1, 60 115, 1, 60 Input...
  • Page 14 4-5. OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed Voltage Model Max. 127V Min. 103V 115V MSZ09UN 115V 1phase 60Hz Indoor unit MSZ12UN Min. 198V 208V 230V Max. 253V MUZ09UN 208/230V 1phase 60Hz Outdoor unit MUZ12UN (2) OPERATION Intake air Indoor Outdoor temperature...
  • Page 15 MSZ09UN MSZ12UN MUZ09UN MUZ12UN The standard data contained in these specifications apply only to the operation of the system under normal conditions. Since operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the system under the conditions indicated by the performance curve.
  • Page 16 Cooling capacity These values are under rated (frequency). 18.7 13.9 17.1 12.8 15.5 11.7 14.0 10.6 12.6 11.2 MUZ09UN MUZ09UN Correction of Cooling capacity Correction of total input 150(Hz) 150(Hz) The operational frequency of compressor The operational frequency of compressor MUZ12UN MUZ12UN Correction of Cooling capacity...
  • Page 17 Heating capacity NOTE:The following curves are for the heating operation without any frost. These values are under rated (frequency). 50.4 43.2 46.6 39.8 42.7 36.5 38.9 33.1 34.9 30.0 31.0 26.5 27.2 23.2 23.2 20.0 MUZ09UN MUZ09UN Correction of Heating capacity Correction of total input 150(Hz) 150(Hz)

  • Page 18: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: inch MSZ09UN 3-1/4 6-5/8 INDOOR UNIT Installation plate Indoor unit 32-3/16 3-1/4 12-13/16 12-13/16 4-5/8 Wall hole [2-9/16 3/16 33-1/2 7-7/16 Installation plate Liquid line [1/4 19-11/16 Gas line [3/8 16-15/16 Air in Insulation [1-7/16 O.D [13/16 I.D 2-1/4 24-3/4...
  • Page 19 MUZ09UN MUZ12UN Unit: inch REQUIRED SPACE Even if the right/left sides OUTDOOR UNIT or back side are vacant, the top has to be at least 4 in. unobstructed. 19-1/2 14-7/16 Drainage holes [1-3/32 Air in Drainage holes [1-3/32 Even if the right/left sides or back side 10-7/16 Drainage holes [1-3/32 are vacant, the front has to be at least...

  • Page 20: Wiring Diagram

    WIRING DIAGRAM MSZ09UN MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR RT13 UNIT CN201 CONNECTING HIC1 WIRES RT12 12V DC FROM OUTDOOR CN112 NR11 UNIT CONNECTING WIRES TRANS TAB12 POWER SUPPLY SR141 115V 1 phase 60Hz CN211 LD101T TO OUTDOOR RT11 ELECTRONIC CONTROL P.C.
  • Page 21 MUZ09UN MODELS WIRING DIAGRAM MUZ12UN OUTDOOR UNIT DSA61 LDE2 DS62 DS61 (–) CN725 (–) (~) TAB69 CT61 T801 – – TAB66 TAB65 NOISE FILTER LDE1 P.C. BOARD TAB68 CN724 LD62 F901 CN642 LD64 FROM INDOOR UNIT TABU CONNECTING WIRES 12V DC ELECTRONIC TABV RELAY...

  • Page 22: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit:inch MUZ09UN MSZ09UN OUTDOOR UNIT INDOOR UNIT 4-way valve Refrigerant pipe {3/8 Muffler (with heat insulator) Main Stop valve Service Indoor indoor coil (with service port) port heat Outdoor thermistor Discharge exchanger Fusible heat RT12 Muffler Flared connection temperature exchanger plug...

  • Page 23: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ09UN MUZ09UN MSZ12UN MUZ12UN Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP(ON/OFF) button ON. Indoor unit receives the signal with a beep tone. When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes.
  • Page 24 8-1. “I FEEL CONTROL” OPERATION Initial room temperature mode (1) Press OPERATE/STOP(ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit turns on with a COOL mode of 77˚F or more beep tone. “I FEEL CONTROL” (2) Press OPERATION SELECT button to set “I FEEL CONTROL”. DRY mode of 73˚F to 77˚F Then a beep tone is heard.
  • Page 25 (5) TEMPERATURE buttons In “I FEEL CONTROL” mode, set temperature is decided by the microprocessor based on the room temperature. In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm.
  • Page 26 Compressor and Outdoor fan motor (continuously at set speed) Indoor fan motor 8-1-2. DRY mode of “I FEEL CONTROL” The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the temperature. By such controls, amount of air flow of indoor unit will be reduced in order to lower humidity without much room tempera- ture drop.
  • Page 27 Operation time chart Example Thermostat Indoor fan Outdoor fan Compressor 4 min. 1 min. 3 min. 8 min. 3. Coil frost prevention • The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL”. • Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection (Coil frost prevention) has the priority.
  • Page 28 (3) Warm air control. When any condition of 1(a. ~ d.) and the condition of 2 as follows are satisfied at the same time, warm air control works. 1 a.) when the operation mode has been changed to HEAT mode b.) when cold air prevention has been released c.) when defrosting has been finished d.) when the compressor starts in HEAT mode...
  • Page 29 Time chart of defrosting in HEAT mode (reverse type) <indoor unit> horizontal set position set position Horizontal vane Indoor fan Very Low (temperature of indoor coil thermistor > 64°F) set speed seconds <outdoor unit> MAX. 79Hz (MSZ12UN) MAX. Hz MAX. 80Hz (MSZ09UN) MAX.
  • Page 30 6. Outdoor fan motor control The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. 5 sec.
  • Page 31 8-5. FAN MOTOR CONTROL <MSZ09UN> (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feed- back the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High, Med., Low) the microprocessor controls SR141 and adjusts fan motor electric current to make the current rotational fre- quency close to the target rotational frequency.
  • Page 32 (7) SWING MODE By selecting SWING mode with the VANE CONTROL button, the horizontal vane swings vertically. The remote controller displays “ ”. (8) Cold air prevention in HEAT operation. When any of the following conditions occurs in HEAT operation, the horizontal vane angle changes to Angle 1 automati- cally to prevent cold air blowing on users.
  • Page 33 8-8. EMERGENCY-TEST OPERATION In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote controller run down.
  • Page 34 (2) At normal operation Alternating current supplied from power supply is eliminated of any noise by L62(Common mode choke coil) and L63 (Common mode choke coil). Then DS61(Diode stack) performs full-wave rectification of alternating current and the alternating current is converted to direct current. C63(Smoothing capacitor) stabilizes the power supply converted to direct current from alternating current and supplies it to IPM(Intelligent power module).
  • Page 35 8-10. Operational frequency control of outdoor unit 1. Outline The operational frequency is as following: First, the target operational frequency is set based on the difference between the room temperature and the set temper- ature. Second, the target operational frequency is regulated by discharge temperature protection, high pressure protection, electric current protection and overload protection and also by the maximum/minimum frequency.
  • Page 36 3. Frequency control by estimated discharge temperature (for protecting the discharge temperature in case the estimated discharge temperature is 212 °F or higher) By calculating the difference between the current discharge temperature and the discharge temperature 15 seconds before, a discharge temperature in one minutes is estimated. As a result, the frequency and LEV are controlled as shown the table below.
  • Page 37 8-12. Expansion valve control (LEV control) (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance.
  • Page 38 (2) Time chart Air conditioner ON Air conditioner OFF Positioning (thermostat off) Opening degree is corrected according to discharge Standard Commanded temperature. opening to open degree Time 13 min. OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT °F) MSZ09UN 136/120...

  • Page 39: Service Functions

    SERVICE FUNCTIONS MSZ09UN MUZ09UN MSZ12UN MUZ12UN 9-1. CHANGE IN DEFROST SETTING <JS> When the JS wire of the outdoor electronic control P.C. board is cut, the defrost temperature will be changed. (Refer to page 58.) Jumper wire Change point Deforst finish temperature changes from 55°F to 59°F. 9-2.
  • Page 40 9-4. AUTO RESTART FUNCTION When the indoor unit is operated with the remote controller, the signals of the operation mode, the set temperature, and the fan speed are sent from the indoor electronic control P.C. board and memorized in the auto restart assembly. When the main power is turned off and then turned back on, the unit restarts automatically in the memorized set conditions approximately after 3 minutes.

  • Page 41: Troubleshooting

    TROUBLESHOOTING MSZ09UN MUZ09UN MSZ12UN MUZ12UN 10-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. 1) Before servicing the air conditioner, first be sure to turn off the remote controller to stop the unit, and then after con- firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
  • Page 42 10-2. Troubleshooting procedure The following procedure facilitates identifying defective points. Details of OPERATION INDICATOR lamp flashing are located on page 43. Start MSZ12UN OPERATION Indoor unit Indoor unit When the remote INDICATOR operates. does'nt receive controller is lamp on the Outdoor unit the signal from pressed or when...
  • Page 43 1. Troubleshooting check table • The following indication applies regardless of shape of the indicatior. flashing · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) Operation Indicator indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighted during normal operation.
  • Page 44 (Outdoor LED indication table) MUZ09UN <Outdoor electronic control P.C. board> MUZ12UN NOTE 1. The location of LED is illustrated at the right figure. 2. LED lights up during normal operation. Transistor Hybrid module flashing transformer Symptom LED indication Abnormal point Detection method Checkpoint 1-time flash every...
  • Page 45 2. Trouble criterion of main parts Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. (Part temperature 50°F ~ 86°F) thermistor(RT11) Main indoor coil Normal Abnormal thermistor(RT12) 8kΩ ~ 20kΩ Open or short-circuit Sub indoor coil thermistor(RT13) Measure the resistance with a tester.
  • Page 46 Part name Check method and criterion Figure Measure the resistance between the terminals with a tester. Outdoor fan (Part temperature14°F ~ 104°F) motor(MF61) Color of lead wire Normal Abnormal AUX. INNER MAIN WHT-BLK 169~208Ω Open or PROTECTOR short-circuit BLK-RED 246~301Ω 266I 14°F OPEN 174I 30°F CLOSE MSZ09UN...
  • Page 47 When OPERATION INDICATOR lamp flashes 5-time. Outdoor unit does not operate. How to check inverter/ compressor Disconnect the connector between compressor and IPM. Check the voltage Refer to B “Check of open phase” on page 47. between terminals. Replace the outdoor Are voltages electronic control P.C.
  • Page 48 Check of compressor Start E 'Check of compressor winding' on page 48. Replace the compressor. Is compressor normal? F 'Check of compressor Is the compressor operation operation time' on page 48. Replace the compressor. time more than 10 seconds? Does the compressor operate continuously? Check the refrigerant circuit.

  • Page 49: Check Of Indoor Fan Motor

    When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate. Check of indoor fan motor Turn OFF the power supply. Check connector (Fan motor) visually. Is soldered point of the connector Are lead wires connected? correctly soldered? Re-connect the lead wires. Re-solder it.

  • Page 50: Check Of Remote Controller And Receiver P.c. Board

    Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller. Check of remote controller and receiver P.C. board wCheck if the remote controller is exclusive for this air conditioner. wIn case of replacing the receiver P.C. board of MSZ09UN, replace the indoor electronic control P.C. board with it because they are unified. Switch on the remote controller.

  • Page 51: Check Of Indoor Electronic Control P.c. Board

    The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board Check the both “parts side” and “pattern side” of indoor electronic control P.C. board visually.
  • Page 52 Cooling operates when heating is expected. Check of R.V. coil Measure resistance of the R.V. coil to check if it is defective or not. If the connector CN 721 is not connected or the R.V. coil is open, the voltage occurs between the terminals even when the control is OFF. R.V.
  • Page 53 Inverter does not work. Check of power supply Star Check the connecting of main circuit part, and connector. Turn on power supply. Is there 208-230V AC between terminal block L1 and L2 on Check the power supply cable. the outdoor unit? Check the Is there 290-330V DC to Is there 208-230V AC between...
  • Page 54 Heating/Cooling does not operate. Check of expansion valve (LEV) 1Turn OFF the outdoor unit power supply. 2Turn ON the outdoor unit power supply. With remote controller set toward the indoor unit, press OPERATE/ STOP(ON/ OFF) button and confirm one beep tone. LEV operates in full-opening direction.

  • Page 55: How To Check Mis-Wiring And Serial Signal Error

    When OPERATION INDICATOR lamp flashes once. Outdoor unit doesn’t operate. How to check mis-wiring and serial signal error Start Turn OFF the power supply. Turn ON the power supply. Is the power voltage to terminal blocks of Rectify the wiring. indoor/outdoor units normal? Turn ON the EMERGENCY OPERATION switch.
  • Page 56 TEST POINT DIAGRAM AND VOLTAGE MSZ09UN Indoor electronic control P.C. board Varistor(NR11) Fuse(F11) 250V AC 3.0A Fan motor Power supply input 115V AC 12V DC Room temperature thermistor(RT11) Timer short mode point (JPS, JPG) (Refer to page 39.) Main indoor coil thermistor(RT12) Sub indoor coil thermistor(RT13)
  • Page 57 TEST POINT DIAGRAM AND VOLTAGE MSZ12UN Indoor electronic control P.C. board Fan motor Very Med. Low High 8 7 5 6 4 Varistor(NR11) Fuse(F11) 250V AC 3.0A CN201 Power supply input 115V AC JP17 12V DC JP16 JP11 5V DC JP24 CN104 Auto restart function...
  • Page 58 MUZ09UN MUZ12UN Outdoor electronic control P.C. board Defrost thermistor(RT61) Fin temperature thermistor(RT64) Discharge temperature thermistor(RT62) 84 104 122 140 158 176 194 212 230 248 32 50 68 84 104 122 140 158 176 Temperature (°F) Temperature (°F) Temperature (°F) Discharge Defrost temperature...
  • Page 59 MUZ09UN MUZ12UN Noise filter P.C. board Current -limit- ing relay (X64) Surge absorber (DSA61) Varistor (NR61) 208/230V AC MUZ09UN F901 MUZ12UN Relay P.C. board R.V. coil(21S4) 208/230V AC Outdoor fan motor (MF61) 208/230V AC...
  • Page 60 RELAY OPERATION MSZ09UN MSZ12UN MODE THERMOSTAT INDOOR FAN SPEED OUTDOOR FAN SPEED COOL & COOL mode AUTO or set speed of I FEEL CONTROL MSZ09UN AUTO(=Low) or set speed Very Low speed MSZ12UN DRY & DRY mode When the compressor operates. of I FEEL CONTROL When the compressor operates.

  • Page 61: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work.
  • Page 62 OPERATING PROCEDURE PHOTOS Screw of the ground wire Photo 3 3. Removing the electrical box (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor(CN112). (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C.
  • Page 63 OPERATING PROCEDURE PHOTOS Photo 6 5. Removing the line flow fan and the indoor fan motor (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly, remove Screws fix- the nozzle assembly.
  • Page 64 11-2. MSZ12UN INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps at the bottom of the front panel. Remove the screws. Front panel (2) Pull the panel down to your side slightly and unhook the catches at the top.
  • Page 65 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (3) Remove the connector of the indoor coil thermistor (CN112). (4) Remove the motor connector and the vane motor connector (CN151) on the electronic control P.C.
  • Page 66 11-3. MUZ09UN MUZ12UN OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Screws of the top panel Photo 1 (1) Remove the screw fixing the service panel. (2) Pull down the service panel and remove it from the cabinet. (3) Remove the screws fixing the top panel and remove the top Screw panel.
  • Page 67 OPERATING PROCEDURE PHOTOS 6. Removing the propeller and the outdoor fan Photo 5 motor (1) Remove the cabinet. (Refer to 1.) Lead clamps (2) Remove the propeller nut. Screws of the Hook (3) Remove the propeller. outdoor fan motor NOTE : Loose the propeller in the rotating direction for Glass terminal removal.

  • Page 68: Parts List

    PARTS LIST MSZ09UN (W) 12-2. ACCESSORY AND 12-1. INDOOR UNIT STRUCTURAL PARTS REMOTE CONTROLLER Optional parts (See page 74.) 12-1. INDOOR UNIT STRUCTURAL PARTS Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MSZ09UN Diagram INSTALLATION PLATE E02 408 970 E02 409 234 BOX(W) E02 409 976...
  • Page 69 MSZ09UN (W) 12-3. INDOOR UNIT ELECTRICAL PARTS 12-4. INDOOR UNIT HEAT EXCHANGER AND FUNCTIONAL PARTS SLEEVE BEARING ROOM TEMPERATURE THERMISTOR FUSE VARISTOR 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Symbol Q'ty/unit in Wiring Part No. Part Name Remarks MSZ09UN Diagram E02 408 302 LINE FLOW FAN...
  • Page 70 MSZ12UN (W) 12-5. INDOOR UNIT STRUCTURAL PARTS 12-6. ACCESSORY AND REMOTE CONTROLLER Optional parts (See page 74.) 12-5. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part Name Remarks Part No.
  • Page 71 MSZ12UN (W) 12-8. INDOOR UNIT HEAT EXCHANGER 12-7. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS SLEEVE BEARING INDOOR COIL THERMISTOR ROOM TEMPERATURE THERMISTOR 12-7. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty/unit in Wiring...
  • Page 72 MUZ09UN MUZ12UN 12-9. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty/unit in Wiring Part No. Part Name Remarks MUZ09UN MUZ12UN Diagram T2W E93 297 TOP PANEL T2W E45 232 FRONT PANEL GRILLE T2W E56 521...

  • Page 73: Electrical Parts

    MUZ09UN MUZ12UN 12-10. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty/unit in Wiring Part No. Part Name Remarks MUZ09UN MUZ12UN Diagram T2W E68 357 SMOOTHING CAPACITOR 2500+/420VAC T2W E93 337 REACTOR T2W E93 441 RELAY P.C.

  • Page 74: Optional Parts

    OPTIONAL PARTS 13-1. REFRIGERANT PIPES     The air conditioner has flared connections its on indoor and outdoor sides. Please use the optional extension pipe as follows. Pipe size Additional A-Gas(in.) B-Liquid(in.) refrigerant Model Part No. Pipe length Insulation Cross- charge...
  • Page 76 C C Copyright 2002 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Feb. 2004. No.OB297 REVISED EDITION-A 7 New publication, effective Feb. 2004 Distributed in May 2002. No.OB297 23 Specifications subject to change without notice.
  • Page 77 3400 Lawrenceville Suwanee Road Suwanee, Georgia 30024 ● Toll Free: 800-433-4822 Toll Free Fax: 800-889-9904 ● www.mrslim.com Specifications are subject to change without notice.

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