Mitsubishi Electric Mr.Slim MSZ09UN W Page 1 Service Manual Download | Manualshive

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SERVICE MANUAL

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
7. REFRIGERANT SYSTEM DIAGRAM ··············22
8. MICROPROCESSOR CONTROL ····················23
9. SERVICE FUNCTIONS ····································39

10. TROUBLESHOOTING······································41
11. DISASSEMBLY INSTRUCTIONS ·····················61
12. PARTS LIST······················································68
13. OPTIONAL PARTS···········································74

Wireless type
Models

MSZ09UN

(W)

· MUZ09UN

MSZ12UN

(W)

· MUZ12UN

No. OB297

REVISED EDITION-A

The Slim Line.
From Mitsubishi Electric.

L IST ED

C

US

Remote
controller

TM

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MSZ09UN

INDOOR UNIT

MUZ09UN
MUZ12UN

OUTDOOR UNIT

Revision A:

●

Conditions of operation frequency have been added.

Please void OB297.

OB297--1.qxp 04.2.4 4:19 PM Page 1

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Summary of Contents for Mr.Slim MSZ09UN W

Page 1: ...ONS 39 10 TROUBLESHOOTING 41 11 DISASSEMBLY INSTRUCTIONS 61 12 PARTS LIST 68 13 OPTIONAL PARTS 74 Wireless type Models MSZ09UN W MUZ09UN MSZ12UN W MUZ12UN No OB297 REVISED EDITION A The Slim Line From Mitsubishi Electric LIST ED C US Remote controller TM SPLIT TYPE HEAT PUMP AIR CONDITIONERS MSZ09UN INDOOR UNIT MUZ09UN MUZ12UN OUTDOOR UNIT Revision A Conditions of operation frequency have been add...

Page 2: ...uch as the accurate control of room temperature for a more comforting airflow and far less temperature variations Hours Room Temperature Single speed comppressor Model Temperature is adjusted by turning on off the compressor Inverter Model Constant temperature is maintained by compressor speed control 10 13 Cool MSH12EN MSZ12UN 6 8 7 7 Heat MSH12EN MSZ12UN Extra energy savings Inverter technology ...

Page 3: ...tion restarts the equipment when power is restored following an outage automatically Operation resumes in the mode in which the equipment was running immediately before the outage HIGH PERFORMANCE ROTARY COMPRESSOR The advanced design of Mitsubishi Electric s powerful and energy efficient rotary compressor results in lower operating costs and longer service life SWING Single rotary Centrifugal for...

Page 4: ...emote control receiving section Remote controller Air cleaning filter option white bellows type Front panel Emergency operation switch Operation indicator lamp Receiving section Operation indicator lamp Receiving section When the grille is opened MSZ09UN MSZ09UN Air inlet back and side Piping Drainage hose Service panel Air outlet Drain outlet OUTDOOR UNIT MUZ09UN MUZ12UN MSZ12UN MSZ12UN MSZ12UN ...

Page 5: ...7 MSZ09UN 1 6 1 2 2 1 1 MSZ12UN ACCESSORIES REMOTE CONTROLLER MSZ09UN MSZ12UN ON OFF TOO COOL PM AM TOO WARM ON OFF FAN TOO WARM TOO COOL VANE MODE STOP START HR MIN I FEEL COOL HEAT DRY PM CLOCK AM RESET CLOCK Open the front lid Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR ...

Page 6: ... Connection method Between the indoor outdoor units Refrigerant charge R22 Refrigerating oil Model Btu h Btu h Btu h W W W V phase Hz A A F L A A kW CFM CFM pt h dB A in in in in Ib V phase Hz A A F L A R L A L R A dB A in in in Ib in in ft ft oz 7 7 6 7 White 115 1 60 15 5 8 7 1 2 Munsell 5 6Y 8 0 0 5 208 230 1 60 15 14 0 43 SHV 130FEA U V 1 05 U W 1 05 U W 1 05 9 7 41 Liner expansion valve 49 Re...

Page 7: ...State at rated compressor Speed B 1 Cooling Steady State at minimum compressor Speed Low ambient Cooling Steady State at minimum compressor Speed Intermediate Cooling Steady State At Intermediate compressor Speed 5 Standard Rating Heating at rated compressor Speed Low temperature Heating at rated compressor Speed Max temperature Heating at minimum compressor Speed High temperature Heating at minim...

Page 8: ...WB temperature F 75 70 65 75 70 65 7 1 7 6 7 7 9 3 9 8 10 1 0 98 0 95 0 91 1 18 1 14 1 10 8 9 9 2 9 7 11 6 12 0 12 6 1 16 1 13 1 09 1 39 1 36 1 31 10 6 10 9 11 3 13 8 14 2 14 6 1 29 1 25 1 22 1 55 1 51 1 47 12 0 12 3 12 7 15 6 16 0 16 5 1 35 1 32 1 29 1 63 1 59 1 55 12 4 12 7 13 0 16 1 16 5 17 0 1 37 1 35 1 31 1 65 1 62 1 57 14 0 14 3 14 6 18 2 18 6 19 0 1 43 1 40 1 37 1 72 1 69 1 65 IDB F 15 25 3...

Page 9: ...ting MSZ09UN MUZ09UN Cooling This value of frequency is not the same as the actual frequency in operating Refer to the page 16 17 for the relationships between frequency and capacity 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 ...

Page 10: ...N MUZ12UN Heating This value of frequency is not the same as the actual frequency in operating Refer to the page 16 17 for the relationships between frequency and capacity 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...

Page 11: ...190 200 210 220 230 240 250 260 270 280 290 300 310 Indoor DB temperature F 75 70 65 PSIG Suction pressure Outdoor ambient temperature 5 10 15 20 25 30 35 40 45 50 55 60 65 70 F 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Indoor DB temperature F 4 3 Condensing pressure How to operate with fixed operational frequency of the compressor 1 Press the EMERGENCY OPERATION switch on the fron...

Page 12: ...on pressure Outdoor ambient temperature Indoor DB temperature F PSIG 86 80 75 70 68 70 75 80 85 90 95 100 104 F 140 160 180 200 220 240 260 280 300 Indoor DB temperature F Outdoor ambient temperature 75 70 65 PSIG Condensing pressure Outdoor ambient temperature 5 10 15 20 25 30 35 40 45 50 55 60 65 70 F 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 Indoor DB temperature F PSI...

Page 13: ...ture Fan speed Airflow Unit Btu h kW Hz kW A A kW A A PSIG PSIG F F F F ft F F F F rpm CFM F F rpm CFM Cooling 11 400 0 73 1 140 70 1 093 5 84 5 71 256 87 186 54 160 80 67 58 56 388 Wet 95 Heating 16 000 1 590 99 1 543 8 24 7 71 265 57 197 34 171 70 60 114 452 Dry 47 43 Heating 12 300 1 320 76 1 285 6 84 6 81 276 59 198 122 36 172 70 60 100 1 000 297 Dry 47 43 DB WB DB WB DB WB Item Model Total El...

Page 14: ...rged up to 25ft 2 lb 7 oz 2 lb 14 oz 25ft 0 30ft 1 62 35ft 3 24 Refrigerant piping length one way 40ft 4 86 45ft 6 48 49ft 8 10 Model 2 OPERATION 78 Function Cooling Heating Standard temperature Maximum temperature Minimum temperature Maximum humidity Standard temperature Maximum temperature Minimum temperature DB F 80 95 67 70 80 70 WB F 67 71 57 60 67 60 Indoor DB F 95 115 67 47 75 17 WB F 43 65...

Page 15: ...hows the difference between the indoor intake air wet dry bulb temperature and the indoor outlet air wet dry bulb temperature for your refer ence at service How to measure the indoor air wet bulb dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor...

Page 16: ... 50 100 150 Hz 0 0 0 5 1 0 1 5 Correction of Cooling capacity Capacity correction factors The operational frequency of compressor MUZ12UN Correction of total input Input correction factors The operational frequency of compressor 0 50 100 150 Hz 0 0 0 5 1 0 1 5 MUZ12UN 18 7 17 1 15 5 14 0 12 6 11 2 MSZ09UN MSZ12UN 13 9 12 8 11 7 10 6 9 5 8 5 80 85 90 95 100 105 110 80 85 90 95 100 105 110 79 75 72 ...

Page 17: ...apacity Capacity correction factors The operational frequency of compressor Correction of total input Input correction factors The operational frequency of compressor 0 50 100 150 Hz 0 0 0 5 1 0 1 5 MUZ12UN MUZ12UN 50 4 46 6 42 7 38 9 34 9 31 0 27 2 23 2 MSZ09UN MSZ12UN 43 2 39 8 36 5 33 1 30 0 26 5 23 2 20 0 14 20 30 40 50 60 59 68 79 1 4 1 3 1 2 1 1 1 0 0 9 0 8 0 7 0 6 14 20 30 40 50 59 68 79 60...

Page 18: ...oor unit Installation plate Liquid line 1 4 19 11 16 Gas line 3 8 16 15 16 Insulation 1 7 16 O D 13 16 I D 10 15 16 MSZ12UN INDOOR UNIT Unit inch 6 3 8 3 4 2 5 16 1 8 11 11 16 17 11 16 17 11 16 13 7 8 17 1 4 10 10 13 16 13 16 2 3 8 1 9 16 5 7 8 25 1 2 8 9 16 3 16 7 1 2 39 3 16 7 1 2 30 1 2 1 15 16 12 5 8 39 15 16 Wireless remote controller 4holes 7 16 O 13 16 Indoor unit Installation plate Wall ho...

Page 19: ...cover Lock nut Conduit cover Connector Service panel Remove one fixing screw to open the service panel Remove the screw holding the T B cover and then remove the cover Unit inch OUTDOOR UNIT Liquid refrigerant pipe joint Refrigerant pipe flared 1 4 Service panel Gas refrigerant pipe joint Refrigerant pipe flared 3 8 MUZ09UN Service port Bolt pitch for installation Handle Air out Air in Drainage ho...

Page 20: ...DOOR COIL THERMISTOR SOLID STATE RELAY TERMINAL BLOCK MSZ12UN HIC1 FROM OUTDOOR 1 phase 60Hz CONNECTING WIRE TO OUTDOOR UNIT 12V DC SUPPLY POWER WIRES CONNECTING UNIT 115V w A disconnect may be required by local code 5 TAB12 P C BOARD DISPLAY MV RED GRN YLW DSAR 3 L1 RED BLK N 3 4 P C BOARD AUTO RESTART ASSY CONTROLLER REMOTE RECEIVER ELECTRONIC CONTROL P C BOARD 5 3 F11 TRANS LDFVL SR141 NR11 SR1...

Page 21: ...TABW TABV R V coil heating ON cooling OFF SYMBOL CT61 C61 C63 C65 CY61 64 DSA61 DS61 62 F801 F901 IPM SYMBOL LEV L61 L62 L63 MC MF61 NR61 RT61 RT62 RT64 R61 SYMBOL R64 SSR61 TB1 2 T801 X61 X64 21S4 NAME CURRENT TRANSFORMER POWER FACTOR CAPACITOR SMOOTHING CAPACITOR OUTDOOR FAN CAPACITOR CAPACITOR SURGE ABSORBER DIODE STACK FUSE 2A FUSE 1A INTELLIGENT POWER MODULE NAME EXPANSION VALVE COIL REACTOR ...

Page 22: ...tor Indoor heat exchanger Outdoor heat exchanger Defrost thermistor RT61 Strainer Unit inch MSZ09UN INDOOR UNIT OUTDOOR UNIT Room Temperature thermistor RT11 Refrigerant pipe 1 2 with heat insulator Flared connection Stop valve with service port Stop valve with strainer Fusible plug Service port Service port Muffler Muffler 4 way valve Compressor Capillary tube Expansion valve Capillary tube O D 0...

Page 23: ...tior INDOOR UNIT DISPLAY SECTION WIRELESS REMOTE CONTROLLER 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 ON OFF FAN TOO WARM TOO COOL V...

Page 24: ...is stopped with the OPERATE STOP ON OFF button on the remote controller and restarted within 2 hours in I FEEL CONTROL mode the system operates in previous mode automatically regardless of the room tem perature Operation time chart Example Previous operation COOL mode of I FEEL CONTROL or COOL mode When the system is restarted after 2 hours and more the operation mode is determined by the room tem...

Page 25: ...TOO COOL TOO WARM Time control When the three conditions as follows have been satisfied for 1 hour and 45 minutes compressor stops for 3 minutes a Compressor has been continuously operating b Indoor fan speed is Low or Med c Room temperature is below 79 F When compressor stops the accumulated time is cancelled and when compressor restarts time counting starts from the beginning Time counting also ...

Page 26: ...rature is 73 F or over When the thermostat is ON the compressor repeats 8 minutes ON and 3 minutes OFF When the thermostat is OFF the compressor repeats 4 minutes OFF and 1 minute ON When the room temperature is under 73 F When the thermostat is ON the compressor repeats 2 minutes ON and 3 minutes OFF When the thermostat is OFF the compressor repeats 4 minutes OFF and 1 minute ON ON Very Low MSZ12...

Page 27: ...m temperature thermistor RT11 is more than 59 F the indoor fan operates at Very Low NOTE If the temperature of RT12 reads from 64 F to 72 F at the air conditioner starting and also after defrosting this control works Released Cold Air Prevention 64 F 72 F Indoor fan speed Set speed Very Low or stop Indoor coil thermistor RT12 temperature MSZ12UN When the compressor is operating 1 if the temperatur...

Page 28: ...rred to as defrost interval The first defrost interval is 35 minutes long and the second 32 minutes long The third and subsequent intervals are set to be longer and less frequent depending on defrosting time The third and subsequent defrost intervals follow any of the three patterns 10 minutes longer the same 10 minutes shorter compared with the previous defrost interval with normal 55 minutes the...

Page 29: ...orizontal vane Very Low temperature of indoor coil thermistor 64 F 30 seconds 30 seconds 30 seconds 1second 5 seconds 1second OFF OFF OFF 5 seconds MAX Hz MAX Hz ON ON ON outdoor unit indoor unit 5 R V coil control Heating ON Cooling OFF Dry OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor ON OFF ON OFF Compressor R V coil COOL DRY HEAT 5 sec 5 sec ON OFF ON ...

Page 30: ...he right chart Thermostat SET TEMP does not work The other operations are same as DRY mode of I FEEL CONTROL 4 DRY operation will not function when the room tempera ture is 55 F or below 8 4 HEAT OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select HEAT mode with the OPERATION SELECT button 3 Press TEMPERATURE buttons TOO WARM ...

Page 31: ...ff 3 minutes later the electric current is applied to the fan motor again During the fan motor lock up the OPERATION INDICATOR lamp flashes on and off to show the fan motor abnormality Refer to page 42 3 Positioning The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle Confirming of standard position is performed in case of follows a ...

Page 32: ...ration ON TIMER button AUTO START operation ON timer OFF TIMER button AUTO STOP operation OFF timer 4 Press HR and MIN button TIME SET button to set the timer Time setting is 10 minute units HR and MIN button will work when or mark is flashing These marks disappear in 1 minute After setting the ON timer check that OPERATION INDICATOR lamp of the indoor unit lights NOTE1 Be sure to place the remote...

Page 33: ... in emergency operation and defrosting cycle as well In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until the EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In case of latter normal operation will start NOTE Do not press the EMERGENCY OPERATION switch during normal o...

Page 34: ...d the period of the current running in the circuit 3 Elimination of electrical noise Noise filter circuit is formed by L62 L63 and the condenser installed on the noise filter P C board It eliminates the electrical noise both common mode and normal mode noise of alternating current power supply supplied to main power supply circuit Noise filter circuit also absorbs electrical noise that is generate...

Page 35: ...etween the room temperature and the set temperature deg Operation frequency Hz 15 15 20 25 30 40 MSZ09UN 98 MSZ12UN 125 2 3 or less 2 3 to 3 1 3 1 to 4 1 4 1 to 5 4 5 4 to 5 9 5 9 to 6 7 6 7 or more At the heating operation 2 Frequency after the unit starts operation Except for the case where the unit operates with the maximum operation frequency In case the difference between the room temperature...

Page 36: ...A 2 A 2 Previous voltage correction value minus 1 Same as previous voltage correction value Previous voltage correction value plus 1 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 sec...

Page 37: ...after compressor stops Remote controller ON LEV is positioned first full closed at zero pulse and then positioned During 2 to 13 minutes after compressor starts Opening degree is adjusted according to standard opening degree Standard opening degree is set for each rotational frequen cy of compressor More than 13 minutes have passed since compressor start up LEV opening degree is corrected to get t...

Page 38: ...corrected according to discharge temperature Positioning Air conditioner ON Air conditioner OFF thermostat off LEV opening degree 13 min 3 Control data Target discharge temperature A B C D E F 30 50 70 The operational frequency of the compressor 90 110 130 Hz A 136 120 B 145 136 C 156 151 D 165 160 E 169 F a Reference value of target discharge temperature COOL HEAT F A 120 100 B 170 130 C 210 160 ...

Page 39: ...ach remote controller P C boards of remote controller must be modified according to the indoor unit number How to modify the remote controller P C board Remove batteries before modification The board has a print as shown below NOTE For remodelling take out the bat teries and press the OPERATE STOP ON OFF button twice or 3 times at first After finish remodelling put back the batteries then press th...

Page 40: ...ers are connected to the same supply system if they are operated before power failure the starting current of all the compressors may flow simultaneously at restart Therefore the special counter measures are required to prevent the main voltage drop or the rush of the starting current by adding to the system that allows the units to start one by one How to release AUTO RESTART FUNCTION 1 Turn off ...

Page 41: ...r the like and then use the remote controller 1 Remove the front lid and replace batteries Then re attach the front lid 2 Press the RESET button NOTE If the RESET button is not pressed the remote controller may not operate correctly Insert the negative pole of the batteries first Check if the polarity of the batteries are correct RESET button Lead wiring Housing point 10 1 Cautions on troubleshoot...

Page 42: ...r to I Check of indoor electronic control P C board on page 51 1 time flash Cause Indoor Outdoor unit Mis wiring Serial signal error 2 time flash Cause Indoor unit Trouble of room temper ature indoor coil thermistor 3 time flash Cause Indoor unit Trouble of indoor fan motor 5 time flash Cause Outdoor unit Outdoor power system abnormality 6 time flash Cause Outdoor unit Trouble of thermistor in out...

Page 43: ...topped due to overcurrent protection or start up failure protection 3 times in a row within 1 minute after start up Thermistor short Thermistors are abnormal when they short after compressor start up Thermistor open Thermistors are abnormal when they open after compressor start up Discharge temperature thermistor is abnormal when open circuit is detected more than 10 minutes after compressor start...

Page 44: ...rate Outdoor unit stops and restarts 3 minutes later is repeated Outdoor unit operates at low frequency Outdoor unit operates 1 time flash every 2 5 seconds NOTE For abnormality location refer to Indoor troubleshooting check table on page 43 2 time flash 2 5 seconds OFF 3 time flash 2 5 seconds OFF 4 time flash 2 5 seconds OFF 5 time flash 2 5 seconds OFF 1 time flash 2 5 seconds OFF 3 time flash ...

Page 45: ...kΩ 60kΩ Abnormal Open or short circuit Normal 150kΩ 600kΩ Abnormal Open or short circuit Normal 30kΩ 180kΩ Abnormal Open or short circuit 2 Trouble criterion of main parts Discharge temperature thermistor RT62 Fin tempera ture thermistor RT64 Disconnect the connector and measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Part temperature 32 F ...

Page 46: ...724 RED ORN Abnormal Open or short circuit YLW BRN BRN BLU YLW RED BLU ORN PNK ROTOR MSZ12UN MSZ09UN RED YLW BRN ORN GRN ROTOR P P INNER PROTECTOR R V coil 21S4 Expansion valve LEV Measure the resistance between the terminals with a tester Part temperature 14 F 104 F Normal 1 2kΩ 1 6kΩ Abnormal Open or short circuit Measure the resistance with a tester Part temperature 14 F 104 F LEV WHT6 RED1 ORG...

Page 47: ...LK WHT BLK RED WHT RED BLK WHT BLK RED WHT RED Voltmeter indication COOL HEAT 120 130 110 Operational frequency Hz Operation mode Model MSZ09UN MSZ12UN MSZ09UN MSZ12UN Output voltage V 64 70 58 Disconnect the connector between compressor and IPM and measure resistance between terminals on the IPM Measurement point at 6 points BLK WHT WHT BLK BLK RED RED BLK WHT RED RED WHT Judgment Infinite normal...

Page 48: ...een the lead wires at 3 points normal 1 several abnormal 0 short abnormal infinite open Ohmmeter indication X1 X1 X1 2 3 W U V 1 WHT Compressor motor RED BLK Check of compressor winding E Connect the compressor and activate the inverter Then measure the time until the inverter stops due to overcurrent Operation method Start heating or cooling operation by pressing the EMERGENCY OPERATION switch on...

Page 49: ... No 2 and No 3 MSZ09UN Are lead wires connected Re connect the lead wires Is soldered point of the connector correctly soldered Replace the indoor electronic con trol P C board Re solder it Is resistance 0 short circuit or open circuit Yes 0 or No others Yes No Yes No No 1 and No 4 and then No 3 and No 4 MSZ12UN MSZ12UN MSZ09UN Insert screwdriver into air outlet and rotate indoor fan motor slowly ...

Page 50: ...t Switch on the remote controller Is LCD display on the remote con troller displayed Remove the batteries then set them back and press the RESET button Check if the unit operates with the remote controller Yes Does the unit operate with the remote controller Yes No not clear Yes No No No No OK Connect properly No Replace the indoor electronic control P C board Replace the auto restart assembly Is ...

Page 51: ... EMERGENCY OPERATION switch Yes No Be sure to check both resistances Turn OFF the power supply Turn OFF the power supply Measure resistance between CN 6411 and 2 Measure resistance between CN 6421 and 2 No Yes Replace the thermistor Replace the outdoor electronic control P C board Disconnect the connectors CN641 and CN642 from the outdoor electronic control P C board Check the characteristics of e...

Page 52: ...lay P C board Replace the R V coil Check of R V coil K Cooling operates when heating is expected Replace the outdoor fan motor Is there voltage of 208 230V AC between outdoor terminal block TB1 L1 and L2 Is there voltage of approx 208 230V AC either between 1 and 3 or between 3 and 5 at CN 771 Disconnect the connector CN 771 on the relay P C board Disconnect the connector between compressor and IP...

Page 53: ...block L1 and L2 on the outdoor unit Turn on power supply Check the connecting of main circuit part and connector Is there 290 330V DC to smoothing capacitor C61 Replace the outdoor electronic control P C board Check the power supply cable Is there 208 230V AC between terminal TAB69 and X64 terminal 4 Check the main circuit parts and replace it Check the current limiting resistor R64 Is there 10 to...

Page 54: ...electronic control P C board LEV operates in full opening direction Is LEV coil properly fixed to the body Ok Do you hear LEV click click Do you touch LEV and feel it vibrate Is LEV coil resistance as per characterictics below Do you hear LEV click click No Yes Yes Yes Yes No No No Properly fix LEV coil to the body Ok Confirm again that LEV is operating 1Turn OFF the outdoor unit power supply 2Tur...

Page 55: ...F the power supply to indoor outdoor units Get indoor terminal blocks 1 1 and 3 3 opened and re connect indoor outdoor wiring Is the power voltage to terminal blocks of indoor outdoor units normal Does the OPERATION INDICATOR lamp on the indoor unit flash on Is the terminal blocks 1 1and 3 3 on the indoor unit properly connected to their counter parts on outdoor unit Start Correct the mis wiring B...

Page 56: ...12 Timer short mode point JPS JPG Refer to page 39 32 F 50 68 86 104 122 140 Room temperature thermistor RT11 Main indoor coil thermistor RT12 Sub indoor coil thermistor RT13 Emergency operation switch Fan motor Sub indoor coil thermistor RT13 Auto restart function Solder the Jumper wire or the Resistor 220Ω to the JR07 Refer to page 40 Power supply input 115V AC 5V DC 12V DC ...

Page 57: ...to page 39 Room temperature thermistor RT11 12V DC 32 F 50 68 86 104 122 140 Room temperature thermistor RT11 Indoor coil thermistor RT12 Varistor NR11 CN201 8 7 5 6 4 3 2 1 Very Low Fan motor JP17 JP16 JP24 JP11 JPG JPS C11 Emergency operation switch Auto restart function Disconnect the AUTO RESTART ASSY from CN104 and solder the Jumper wire to JHA Refer to page 40 CN104 JHA Med Low High ...

Page 58: ...248 0 100 200 300 400 500 600 700 32 50 68 84 104 122 140 158 176 0 20 40 60 80 100 120 140 160 180 200 Temperature F Fin temperature thermistor RT64 Resistance k Resistance k Resistance k Fin temperature thermistor RT64 LEV connector CN724 LED monitor lamp Defrost thermistor RT61 Discharge temperature thermistor RT62 Jumper wire for change in defrost setting JS Refer to page 39 Connector for indo...

Page 59: ...09UN MUZ12UN Noise filter P C board Current limit ing relay X64 208 230V AC Surge absorber DSA61 Varistor NR61 MUZ09UN MUZ12UN Relay P C board R V coil 21S4 208 230V AC Outdoor fan motor MF61 208 230V AC F901 ...

Page 60: ...f I FEEL CONTROL HEAT HEAT mode of I FEEL CONTROL AUTO Low or set speed Very Low speed When the compressor operates AUTO Low or set speed When the compressor stops OFF AUTO or set speed AUTO or set speed Very Low speed OFF or Very Low speed ON OFF ON OFF ON OFF ON OFF When the compressor operates ON When the compressor stops OFF COOL mode of I FEEL CONTROL MODE THERMOSTAT INDOOR FAN SPEED X64 ON O...

Page 61: ...r OPERATING PROCEDURE PHOTOS Photo 1 Photo 2 Screws Front panel Indoor electronic control P C board Screw of the termi nal block 1 Removing the front panel 1 Remove the screw caps at the bottom of the front panel Remove the screws 2 Pull the panel down to your side slightly and unhook the catches at the top 2 Removing the electronic control P C board and the power monitor receiver P C board 1 Remo...

Page 62: ...il thermistor lead wire from the electrical box 7 Remove the lead wire of vane motor from the bottom of electrical box 8 Remove the R L holder 9 Remove the screw of the conduit cover 10 Pull down the conduit cover and remove it 11 Remove the screws of the conduit plate and remove the conduit plate 12 Remove the screw fixing the electrical box remove the electrical box 4 Removing the vane motor 1 R...

Page 63: ...ve 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 the nozzle assembly 4 Remove the hexagon socket set screw from the line flow fan 5 Remove the screws fixing the fan motor remove the fan motor 6 Remove the screws fixing the left side of the heat exchanger 7 Lifting the left side of the heat exchanger 8 Remove the line flo...

Page 64: ... Refer to 1 2 Remove the electrical cover 3 Remove the screw of the terminal cover 4 Remove the screw of the terminal block 5 Unhook the catch of the lamp holder 6 Remove the receiver holder and the receiver P C board 7 Remove the screw of the ground wire 8 Disconnect all the connectors and all the lead wires on the electronic control P C board 9 Remove the electronic control P C board and display...

Page 65: ...earing support Heat exchanger Indoor fan motor Line flow fan 3 Removing the electrical box 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 board 5 Remove the screw of the electrical box remove the electrical box Photo 3 Screw of ...

Page 66: ...p panel and the cabinet Refer to 1 2 Remove all the connectors and the terminals on the noise fil ter P C board 3 Remove the screw of ground wire on the relay panel 4 Remove the hooks of T B support Then remove the noise filter P C board 4 Removing the relay P C board 1 Remove the service panel top panel and the cabinet Refer to 1 2 Remove all the connectors and the terminals on the relay P C boar...

Page 67: ... Remove the inverter assembly 3 Remove the soundproof felt 4 Remove the terminal cover on the compressor 5 Disconnect lead wires from the glass terminal of the com pressor 6 Recover gas from the refrigerant circuit 7 Disconnect the welded part of the discharge pipe 8 Disconnect the welded part of the suction pipe 9 Remove nuts fixing the compressor 10 Remove the compressor NOTE Before using the to...

Page 68: ...PANEL ASSEMBLY W SCREW CAP W GRILLE W CATCH W AIR FILTER CORNER BOX RIGHT W Symbol in Wiring Diagram Q ty unit 1 1 1 1 2 1 3 2 1 Including 5 6 7 2PCS SET 3PCS SET Remarks Part No NO Part Name MSZ09UN W E02 408 970 E02 409 234 E02 409 976 E02 424 000 E02 409 067 E02 424 010 E02 408 142 E02 408 100 E02 409 975 E02 545 426 E02 527 083 10 11 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER 1 1 Optional part...

Page 69: ...ARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE W VANE UPPER W VANE LOWER W FUSE VARISTOR VANE CRANK SET VANE MOTOR ROOM TEMPERATURE THERMISTOR INDOOR FAN MOTOR RECEIVER ELECTRONIC CONTROL P C BOARD TERMINAL BLOCK FAN MOTOR RUBBER MOUNT INDOOR COIL THERMISTOR SET MOTOR BAND Symbol in Wiring Diagram Q ty unit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 250V 3A RC4W19 AUTO RESTART 2PCS SET Main Sub Remarks P...

Page 70: ... 2 3 4 5 6 7 INSTALLATION PLATE BOX W FRONT PANEL ASSEMBLY W GRILLE W SCREW CAP W AIR FILTER LAMP PANEL W Symbol in Wiring Diagram Q ty unit 1 1 1 1 3 2 1 Including 4 5 3PCS SET Remarks Part No NO Part Name MSZ12UN W E02 141 970 E02 143 234 E02 138 000 E02 138 010 E02 143 067 E02 141 100 E02 470 007 9 E02 545 426 E02 527 083 8 9 1 1 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER Optional parts See pag...

Page 71: ...NG MOUNT BEARING SUPPORT DRAIN HOSE NOZZLE W VANE W VANE MOTOR INDOOR COIL THERMISTOR TERMINAL BLOCK ROOM TEMPERATURE THERMISTOR RECEIVER P C BOARD ELECTRONIC CONTROL P C BOARD FAN MOTOR RUBBER MOUNT DISPLAY P C BOARD MOTOR BAND ASSEMBLY WATER CUT INDOOR FAN MOTOR AUTO RESTART ASSEMBLY FUSE VARISTOR SURGE ABSORVER 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 2PCS SET RA4W18 250V 3A MV RT12 TB RT11 ...

Page 72: ...IAL When servicing cut the tube to the proper length as shown in the REFRIGERANT SYSTEM DIAGRAM Refer to page 22 T2W E93 297 T2W E45 232 T2W E56 521 M21 47L 501 T2W E93 290 T92 501 280 M21 20A 661 M21 20T 661 M21 20A 662 T2W E93 245 T2W E93 531 T2W E93 645 T2W H95 642 M21 45G 293 T2W E93 523 T2W E93 301 M21 50L 515 T2W E93 630 T2W E45 936 T2W E93 651 T2W E93 943 T2W E94 943 M21 00E 943 1 2 3 4 5 6...

Page 73: ... P C BOARD ELECTRONIC CONTROL P C BOARD DIODE STACK FUSE FUSE T2W E68 357 T2W E93 337 T2W E93 441 T2W E68 424 T2W 827 389 M21 J89 308 T2W E93 307 T2W E68 356 T2W E93 376 T2W E94 376 M21 PG2 361 T2W E93 451 T2W E94 451 T2W E45 447 T2W 800 382 T2W E88 382 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol in Wiring Diagram Q ty unit 2500 420VAC Defrost Discharge 165 420VAC 4P 3P RGB20FSY 10 250V 2A 250V 1A Rem...

Page 74: ...e shade thoroughly When the filter color is still dark even after cleaning replace the filter with a new one Replace the filter at least once a year DEODORIZING FILTER and AIR CLEANING FILTER can be attached on either side Deodorizing filter Gray sponge type Pipe length Cross section Part No Model A Gas in B Liquid in Pipe size Insulation in Additional refrigerant charge R22 oz MSZ12UN MUZ12UN Out...

Page 75: ......

Page 76: ... effective Feb 2004 Specifications subject to change without notice C C Copyright 2002 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Feb 2004 No OB297 REVISED EDITION A 7 Distributed in May 2002 No OB297 23 TM ...

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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