Mitsubishi Electric MSZ-G09SV Service Manual
  1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. MSZ-G09SV
  6. Service manual

Mitsubishi Electric MSZ-G09SV Service Manual

Wireless type split-type, heat pump air conditioners
Hide thumbs Also See for MSZ-G09SV:
Table of Contents

Advertisement

Quick Links

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

Wireless type
Models
MSZ-G09SV -
MSZ-G09SV -
MSZ-G12SV -
MSZ-G12SV -
MSZ-G20SV -
MSZ-G20SV -
( WH )
E1
( WH )
E2
( WH )
E1
( WH )
E2
( WH )
E1
E1
Revision:
MSZ-G20SV -
Specification, PERFORMANCE CURVES
and PARTS LIST have been added.
Please void OB245 REVISED EDITION-A.
· MUZ-G09SV -
· MUZ-G09SV -
· MUZ-G12SV -
· MUZ-G12SV -
· MUZ-G20SV -
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································7
4. NOISE CRITERIA CURVES ·····························11
5. OUTLINES AND DIMENSIONS ·······················13
6. WIRING DIAGRAM ··········································17
7. REFRIGERANT SYSTEM DIAGRAM ··············21
8. PERFORMANCE CURVES ······························24
9. MICROPROCESSOR CONTROL ····················35
10. SERVICE FUNCTIONS·····································63
11. TROUBLESHOOTING ······································66
12. DISASSEMBLY INSTRUCTIONS·····················97
13. PARTS LIST····················································106
14. OPTIONAL PARTS ·········································115
has been added.
E1
No. OB245
REVISED EDITION-B
E1
E2
E1
E2
E1

Advertisement

Table of Contents
loading

Related Manuals for Mitsubishi Electric MSZ-G09SV

Summary of Contents for Mitsubishi Electric MSZ-G09SV

  • Page 1: Service Manual

    PARTS LIST have been added. Please void OB245 REVISED EDITION-A. No. OB245 REVISED EDITION-B SERVICE MANUAL Wireless type Models MSZ-G09SV - · MUZ-G09SV - ( WH ) MSZ-G09SV - · MUZ-G09SV - ( WH ) MSZ-G12SV - · MUZ-G12SV -...

  • Page 2: Technical Changes

    TECHNICAL CHANGES MSZ-G09SV - MSZ-G09SV - MSZ-G12SV - MSZ-G12SV - 1. Remote controller has been changed. MUZ-G09SV - MUZ-G09SV - MUZ-G12SV - MUZ-G12SV - 1. Only model name has changed. MSZ-G20SV - New model MUZ-G20SV - New model PART NAMES AND FUNCTIONS...

  • Page 3: Outdoor Unit

    (back and side) Piping Drain hose Model indication Air outlet Air outlet Drain outlet ACCESSORIES MSZ-G09SV - INDOOR UNIT MSZ-G09SV - MSZ-G20SV - MSZ-G12SV - MSZ-G12SV - Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 1.6 mm (Black)

  • Page 4: Remote Controller

    REMOTE CONTROLLER MSZ-G09SV - MSZ-G12SV - Signal transmitting section Operation display section CLOCK 6 00 1 1 00 OPERATE /STOP (ON /OFF)button ON/OFF COOL WARM OPERATION SELECT button TEMPERATURE buttons MODE I FEEL COOL DRY HEAT VANE FAN SPEED CONTROL button...
  • Page 5 MSZ-G09SV - MSZ-G12SV - Signal transmitting section Operation display section CLOCK AMPM AMPM OPERATE /STOP (ON /OFF) button ON/OFF WARM COOL TEMPERATURE buttons Open the front lid. CLOCK AMPM ON/OFF WARM COOL VANE CONTROL button FAN SPEED CONTROL button STOP...
  • Page 6 MSZ-G20SV - Signal transmitting section Operation display section OPERATE /STOP (ON /OFF) button ON/OFF WARM COOL TEMPERATURE buttons Open the front lid. CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button STOP (Horizontal vane button) I FEEL COOL OFF-TIMER button VANE START HEAT DRY...
  • Page 7 SPECIFICATION MSZ-G12SV - MSZ-G09SV - Indoor model MSZ-G09SV - MSZ-G12SV - Function Cooling Heating Cooling Heating Single phase Single phase Power supply 230V,50Hz 230V,50Hz Capacity 3.5 (0.9-4.0) 2.6 (1.3-3.1) 3.6 (1.4-5.1) 4.8 (0.9-6.7) Air flow(High/Med. W /Low W ) 588/444 W /312 W...
  • Page 8 Indoor model MSZ-G20SV - Cooling Heating Function Single phase Power supply 230V, 50Hz Capacity Air flow(High/Med. W /Low W ) 960/822 W /684 W 960/834 W /732 W K /h Dehumidification — Power outlet Running current 11.20 9.32 Power input 2,320 1,930 Auxiliary heater...

  • Page 9: Indoor Unit

    Specifications and rating conditions of main electric parts INDOOR UNIT MSZ-G09SV - MSZ-G12SV - Model Item MSZ-G09SV - MSZ-G12SV - 1.5+ 440V Indoor fan capacitor (C11) 250V 3.15A Fuse (F11) 93:5A 250V Thermal fuse (F12) MP20GA 12V 300" Vane motor...
  • Page 10 Specifications and rating conditions of main electric parts INDOOR UNIT Model MSZ-G20SV - Item 2.5+ 440V Indoor fan capacitor (C11) 250V 3.15A Fuse (F11) MP20 12V 300" Vane motor (MV1, MV2) ERZV 10D 471 Varistor (NR11) S201 DH1Y 250V 1.5A Solid state relay (SR141) Terminal block...

  • Page 11: Noise Criteria Curves

    NOISE CRITERIA CURVES MSZ-G09SV - MUZ-G09SV - MSZ-G09SV - MUZ-G09SV - SPEED SPL(dB(A)) LINE FAN SPEED SPL(dB(A)) LINE FUNCTION FUNCTION COOLING COOLING High High HEATING HEATING Test conditions, Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)
  • Page 12 MSZ-G20SV - MUZ-G20SV - FAM SPEED SPL(dB(A)) LINE FUNCTION FAN SPEED SPL(dB(A)) LINE FUNCTION COOLING COOLING High High HEATING HEATING Test conditions, Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24: Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5: NC-70...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm MSZ-G09SV - Installation plate INDOOR UNIT Indoor unit 81.5 116.5 Wall hole [65 Installation plate Liquid line [6.35-0.5m Gas line [9.52-0.43m Air in Insulation [37 O.D. [21 I.D. Drain hose [16 (Connected part O.D.) 17.5...
  • Page 14 MSZ-G12SV - Installation plate INDOOR UNIT Indoor unit 81.5 116.5 Wall hole [65 Installation plate Liquid line [6.35-0.5m Gas line [9.52-0.43m Air in Insulation [37 O.D. [21 I.D. Drain hose [16 (Connected part O.D.) 17.5 Insulation [28 Air out Power supply cord Lead to right 1.0m Lead to left 0.3m...
  • Page 15 MUZ-G09SV - MUZ-G12SV - Unit: mm MUZ-G09SV - MUZ-G12SV - OUTDOOR UNIT REQUIRED SPACE Even if the right/ left sides or back side are vacant, the top has to be at least 100mm unobstructed. Drainage holes [28 Air in However, either the Drainage holes [28 left/ right sides or back side should...
  • Page 16 MSZ-G20SV - Unit: mm Installation plate Indoor unit INDOOR UNIT 1068 414.5 414.5 Wall hole [ 75 1100 Installation plate Liquid line [ 9.52- 0.5m Gas line [ 19-0.43m Insulation [ 50 O.D Air in [ 32 I.D Drain hose [ 16 Air out (Connected part O.D) Insulation [ 28...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM MSZ-G09SV - MODELS WIRING DIAGRAM MSZ-G12SV - INDOOR UNIT RT13 TO OUTDOOR UNIT HIC1 CONNECTING RT12 CN112 CN201 NR11 230V~ TRANS SR141 CN211 LD101T RT11 ELECTRONIC CONTROL P.C. BOARD POWER SUPPLY CORD ~/N 230V POWER MONITOR, 50Hz RECEIVER P.C.
  • Page 18 MUZ-G09SV - MODELS WIRING DIAGRAM MUZ-G09SV - OUTDOOR UNIT DSA61 LDE2 DS62 DS61 CN725 TAB69 TAB63 CT61 T801 TAB64 NOISE FILTER P.C. BOARD TAB66 LDE1 TAB65 TAB68 CN724 LD62 F901 CN642 LD64 230V ~ ELECTRONIC RELAY P.C. BOARD CONTROL P.C. BOARD CN721 CN771 6 5 4 3 2 1...
  • Page 19 MUZ-G12SV - MODELS WIRING DIAGRAM MUZ-G12SV - OUTDOOR UNIT DSA61 LDE2 DS62 DS61 CN725 TAB69 TAB63 CT61 T801 TAB64 NOISE FILTER P.C. BOARD LDE1 TAB66 TAB65 TAB68 CN724 LD62 F901 CN642 LD64 230V ~ ELECTRONIC RELAY P.C BOARD CONTROL P.C. BOARD CN721 CN771 6 5 4 3 2 1...
  • Page 20 MSZ-G20SV - MODEL WIRING DIAGRAM INDOOR UNIT RT13 FROM OUTDOOR UNIT HIC1 RT12 CONNECTING CN112 CN201 NR11 TRANS SR141 230V~ TAB12 CN211 RT11 ELECTRONIC CONTROL P.C. BOARD DISPLAY RECEIVER P.C.BOARD P.C.BOARD REMOTE CONTROLLER SYMBOL NAME NAME SYMBOL NAME SYMBOL INDOOR FAN CAPACITOR VANE MOTOR(VERTICAL) SR141 SOLID STATE RELAY...

  • Page 21: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit:mm MSZ-G09SV - MUZ-G09SV - MSZ-G09SV - MUZ-G09SV - INDOOR UNIT OUTDOOR UNIT 4-way valve Refrigerant pipe [9.52 (with heat insulator) Muffler Indoor coil Stop valve thermistor Indoor (with service port) RT12(main) heat Outdoor exchanger Discharge heat...
  • Page 22 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Liquid Indoor unit Outdoor unit MSZ-G09SV - MUZ-G09SV - 9.52 MSZ-G09SV - MUZ-G09SV - 6.35 MSZ-G12SV - Gas 0.43 MUZ-G12SV - 12.7...
  • Page 23 Max. Height difference 10m (MSZ-G12/ G20SV ) Outdoor unit w Height difference should be within 8m(MSZ-G09SV ) / 10m(MSZ-G12/ G20SV ) regardless of which unit, indoor or outdoor position is high. ADDITIONAL REFRIGERANT CHARGE (R22:g) Refrigerant piping length (one way)

  • Page 24: Performance Curves

    PERFORMANCE CURVES MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - MSZ-G20SV - MUZ-G20SV - The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions.
  • Page 25 23.9 28.0 29.3 22.0 25.9 27.1 20.2 23.7 24.8 21.6 22.6 18.4 19.4 20.3 16.5 17.2 18.1 14.7 12.9 15.1 15.8 11.0 12.9 13.5 Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above curves are for the heating operation without any frost. MUZ-G09SV - MUZ-G09SV - MUZ-G09SV -...
  • Page 26 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 2. Compressor starts at 79Hz(MSZ-G09SV)/ 85Hz(MSZ-G12SV)/ 80Hz(MSZ-G20SV) in COOL mode or @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @...

  • Page 27: Heat Operation

    HEAT operation Condition indoor: Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Condition outdoor: Dry bulb temperature 2,7,15,20.0°C Wet bulb temperature 1,6,12,14.5°C MUZ-G09SV - MUZ-G12SV - MUZ-G09SV - MUZ-G12SV - 58Hz 58Hz 25(:) 25(:) Ambient temperature(˚C) Ambient temperature(˚C) MUZ-G20SV - 80Hz 20 25(:) Ambient temperature(˚C)
  • Page 28 PERFORMANCE DATA COOL operation Rated frequency 79HZ MSZ-G09SV - : MUZ-G09SV - MSZ-G09SV - : MUZ-G09SV - CAPACITY:2.6(KW) INPUT:940(W) SHF:0.68 DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.06 1.53 0.50...
  • Page 29 PERFORMANCE DATA COOL operation Rated frequency 79Hz MSZ-G09SV - : MUZ-G09SV - MSZ-G09SV - : MUZ-G09SV - CAPACITY:2.6(KW) SHF:0.68 INPUT:940(W) OUTDOOR DB(;) INDOOR INDOOR DB(;) WB(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.55 1.27 0.50 2.34 1.17 0.50...
  • Page 30 PERFORMANCE DATA COOL operation Rated frequency 85Hz MSZ-G12SV - : MUZ-G12SV - MSZ-G12SV - : MUZ-G12SV - CAPACITY:3.5(KW) SHF:0.67 INPUT:1290(W) OUTDOOR DB(;) INDOOR INDOOR DB(;) WB(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.11 2.02 0.49 1032 3.94 1.93 0.49 1084...
  • Page 31 PERFORMANCE DATA COOL operation Rated frequency 85Hz MSZ-G12SV - : MUZ-G12SV - MSZ-G12SV - : MUZ-G12SV - CAPACITY:3.5(KW) INPUT:1290(W) SHF:0.67 DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.68 0.49 1264...
  • Page 32 PERFORMANCE DATA COOL operation Rated frequency 120Hz MSZ-G20SV - : MUZ-G20SV - CAPACITY:5.3(KW) INPUT:2320(W) SHF:0.78 OUTDOOR DB( : ) INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 6.23 3.74 0.60 1856 5.96 3.58 0.60 1949...
  • Page 33 PERFORMANCE DATA COOL operation Rated frequency 120Hz MSZ-G20SV - : MUZ-G20SV - CAPACITY:5.3(KW) INPUT:2320(W) SHF:0.78 OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.19 3.12 0.60 2274 4.77 2.86 0.60 2413 4.58 2.75 0.60 2459...
  • Page 34 PERFORMANCE DATA HEAT operation MSZ-G09SV - : MUZ-G09SV - MSZ-G09SV - : MUZ-G09SV - Rated frequency 95Hz CAPACITY:3.6(KW) INPUT:1140(W) WB( : ) OUTDOOR INDOOR DB( : ) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.27 2.74 3.20 1003 3.67 1083 4.14...

  • Page 35: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - 9-1. on page 35 ~ 9-13. on page 47 WIRELESS REMOTE CONTROLLER MSZ-G09SV - MSZ-G09SV - MSZ-G12SV - MSZ-G12SV - Signal transmitting section...
  • Page 36 Once the mode is fixed, the mode does not change by room temperature afterwards. Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at set time the opera- tion starts. When the system is stopped 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 temperature.
  • Page 37 9-1-1. Cool mode of “I FEEL CONTROL” 1. Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button Difference between room regardless of the thermostat’s OFF-ON. temperature and set tem- In AUTO the fan speed is as follows. perature during operation.
  • Page 38 3. Coil frost prevention The operational frequency of the compressor is controlled based on the temperature of the indoor coil thermistor (RT12). Temperature of indoor coil thermistor:RT12 Operation frequency Approx. 8°C or above Normal Approx. 6°C to 8°C Fixed Approx. 4°C to 6°C Lower at the rate of 3Hz/min.
  • Page 39 Horizontal vane Indoor fan set speed Very Low (temperature of indoor coil thermistor > 18:) seconds <outdoor unit> MAX. 105Hz (MSZ-G09SV) MAX. Hz MAX. 125Hz (MSZ-G12SV) MAX. Hz Compressor normal second seconds seconds second 5 seconds...
  • Page 40 9-2. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with the OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Indoor fan continues to operate regardless of thermostat’s OFF-ON Coil frost prevention is same as COOL mode of “I FEEL CONTROL”...
  • Page 41 (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) When the OPERATE/STOP(ON/OFF) button is pressed. (b) When the vane control is changed AUTO to MANUAL.
  • Page 42 (9) ECONO COOL ( ) operation (ECONOmical operation) When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12). SWING operation makes you feel cooler than set temperature.
  • Page 43 PROGRAM TIMER MSZ-G09SV - MSZ-G12SV - MSZ-G09SV - MSZ-G12SV - The OFF timer and ON timer can be used in combination. “ ” or “ ” and “ ” or “ ” display shows the order of the OFF timer and ON timer operation.
  • Page 44 MSZ-G09SV - MSZ-G09SV - MSZ-G12SV - MSZ-G12SV - w The maximum frequency in COOL mode varies according to operation hours as shown below. w However, it is under rating frequency when indoor fan speed is set to MANUAL Low or AUTO Low.
  • Page 45 9-10. 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 46 Commanded temperature. opening to open degree Time 13 min. OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT :) MSZ-G09SV - 58/49 63/58 69/66 74/71 74/76 74/78 MSZ-G09SV - A(target discharge temperature) MSZ-G12SV - 78/76 57/48...
  • Page 47 5 sec. 15 sec. Compressor Outdoor fan 9-12. R.V. coil control Heating ....ON Cooling ....OFF Dry .

  • Page 48: Wireless Remote Controller

    MSZ-G20SV - MUZ-G20SV - 9-14. on page 48 ~ 9-29. on page 63 Once the operation mode are set, the same operation mode can be repeated by simply turning the WIRELESS REMOTE CONTROLLER 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 Signal transmitting section protect system from overload and compressor will not restart...
  • Page 49 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 26: or more COOL mode of "I FEEL CONTROL" 25: to 26: Initial room temperature minus 2: DRY mode of 23: to 25: Initial room temperature minus 2: "I FEEL CONTROL"...
  • Page 50 2 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 26°C. When compressor stops, the accumulated time is cancelled and when compressor restarts, time counting starts from the beginning.
  • Page 51 (3) Warm air control When compressor starts in heating operation or after defrosting, the fan changes the speed due to the indoor coil ther- mistor RT12 temperature to blow out warm air. After releasing of cold air prevention, when the indoor coil thermistor RT12 temperature is 37°C or above, the fan speed shifts to the set speed, and when the fan speed is changed by the remote controller, the fan speed is the set speed.
  • Page 52 (3) Defrosting time chart Defrost thermistor RT61 -3: or more -3: or less Compressor 15 seconds 30 seconds (R.V. coil) 30 seconds 5 seconds Outdoor fan Defrost counter Max 10 minutes NOTE Indoor fan Very Low Horizontal Indoor vane Set Position NOTE When the indoor coil thermistor reads above 18°C, indoor fan operates at Very Low for 30 seconds.
  • Page 53 9-15. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with the OPERATION SELECT button. (3) Press the TEMPERATURE buttons. (TOO WARM or TOO COOL button) to select the decided temperature.
  • Page 54 (3) Positioning The horizontal 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) When the OPERATE/STOP(ON/OFF) button is pressed (POWER ON/OFF). (b) When the vane control is changed from AUTO to MANUAL.
  • Page 55 (9) ECONO COOL ( ) operation (ECONOmical operation) When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(Tp (w 1) SWING operation makes you feel cooler than set temperature.
  • Page 56 2. Vertical vane (1) Vane motor drive This model is equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor. (2) The vertical vane angle and mode changes as follows by pressing the WIDE VANE button. SWING (3) Positioning The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.
  • Page 57 2. Cancel TIMER setting can be cancelled with the ON/OFF TIMER buttons. To cancel the ON timer, press the ON-TIMER button. To cancel the OFF timer, press the OFF-TIMER button. TIMER is cancelled and the display of set time disappears. PROGRAM TIMER The OFF timer and ON timer can be used in combination.
  • Page 58 9-22. Main power supply circuit Outline drawing of main power supply R64AR64B DS62 DS61 CT61 (–) POWER (–) (~) SUPPLY NOISE FILTER P.C. BOARD – – COMPRESSORE MICROPROCESSOR ELECTRONIC CONTROL P.C. BOARD 1. Outline of main power supply circuit (1) When the electricity is turned on to the outdoor unit Rush current generates in the main power supply circuit.
  • Page 59 Symbol Function Name POWER-FACTOR CAPACITOR It improves the power factor of power supply. SMOOTHING CAPACITOR It stabilizes the direct current voltage. CT61 CURRENT TRANSFORMER It measures the current of main power supply circuit. DS61 DIODE STACK It converts the alternating current voltage to direct current voltage. DS62 DIODE STACK It is combined with L to improve the power factor of power supply.
  • Page 60 At the cooling operation At the heating operation The difference between The difference between Operation frequency Operation frequency the room temperature and the room temperature and the set temperature (deg.) the set temperature (deg.) (Hz) (Hz) 1.8 or less 2.3 or less 2.3 to 3.1 1.8 to 2.3 2.3 to 3.6...
  • Page 61 9-25. LEV control Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. Indoor unit status LEV opening Stop Opening before stop 500 pulse in 15 minutes Thermostat OFF in Maintain LEV opening before stop 500 pulse in 15 minutes COOL or DRY mode •...
  • Page 62 The LEV opening is corrected according to difference between the target discharge temperature and discharge temperature. LEV opening Discharge temperature (:) correction (pulse) COOL HEAT more than Target discharge temperature+11 Target discharge temperature+11 to Target discharge temperature+8 Target discharge temperature+8 to Target discharge temperature+5 Target discharge temperature+5 to Target discharge temperature+2 Target discharge temperature+2 to Target discharge temperature-2 Target discharge temperature-2...

  • Page 63: Service Functions

    Indoor pipe temperature thermistor Defrosting Protection Defrost thermistor Defrosting Fin temperature thermistor Protection SERVICE FUNCTIONS MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - MSZ-G20SV - MUZ-G20SV - 10-1. CHANGE IN DEFROST SETTING...
  • Page 64 The P.C. board has the print “J1” and “J2”. Jumper wires are mounted to each “J1” and “J2”.Cut “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button. Table 1 1 unit operation 2 units operation 3 units operation...
  • Page 65 Pull out the indoor electronic control P.C. board and the display P.C.board. (Refer to page 97 or 99.) Cut the RESISTOR JR07 on the indoor electronic control P.C.board. (Refer to page 90 or 91.) MSZ-G09SV - MSZ-G12SV - MSZ-G20SV -...

  • Page 66: Troubleshooting

    TROUBLESHOOTING MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - MSZ-G12SV - MUZ-G09SV - MSZ-G09SV - MUZ-G12SV - MSZ-G20SV - MUZ-G20SV - 11-1. 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.
  • Page 67 11-2. Instruction of troubleshooting MSZ-G09SV - MSZ-G12SV - MSZ-G09SV - MSZ-G12SV - Start Indoor unit Indoor unit OPERATION INDICATOR operates. does'nt receive lamp on the indoor unit is Outdoor unit the signal from flashing on and off. doesn't remote controller.
  • Page 68 MSZ-G20SV - Start Indoor unit Indoor unit OPERATION INDICATOR operates. doesn't receive lamp on the indoor unit is Outdoor unit the signal from flashing on and off. doesn't remote controller. operate. Outdoor unit Unit doesn't Indoor unit Indoor unit doesn't Outdoor unit operate doesn't operate,...
  • Page 69 1. Troubleshooting check table INDOOR UNIT MSZ-G09SV - MSZ-G12SV - MSZ-G09SV - MSZ-G12SV - •The following indication applies regardless of shape of the indicator. flashing · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible Operation Indicator abnormalities.
  • Page 70 INDOOR UNIT MSZ-G20SV - •The following indication applies regardless of shape of the indicator. flashing · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible Operation Indicator abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. NOTE: Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
  • Page 71 OUTDOOR UNIT <Outdoor electronic control P.C. board> MUZ-G09SV - MUZ-G12SV - MUZ-G09SV - MUZ-G12SV - NOTE 1. The location of LED is illustrated at the right figure. Transistor Hybrid 2. LED lights up during normal operation. module Refer to page 92. flashing transformer Symptom...
  • Page 72 OUTDOOR UNIT MUZ-G20SV - Refer to page 93. LED 1 (red) LED 2 (yellow) Error mode Lighting Lighting Normal NOTE: When both LED lamps are not lighting, check if the power is supplied to the unit. Refer to “U” on page 85. Symptom: Outdoor unit does not operate.
  • Page 73 Symptom: Outdoor unit operates (The compressor operates at reduced frequency) Indication Abnormal point Detecting method Check points LED 1 LED 2 (red) (Yellow) 1-time Lighting Current protection When the outdoor unit input current exceeds 15.5A. 2-time Lighting Overload protection When the compressor load exceed the specified value. These symptoms do not mean any abnor- High pressure protec- mality of the product, but check the follow-...
  • Page 74 2. Trouble criterion of main parts MSZ-G09SV - MSZ-G12SV - MUZ-G09SV - MUZ-G12SV - MSZ-G09SV - MSZ-G12SV - MUZ-G09SV - MUZ-G12SV - Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. (Part temperature 10˚C ~ 30˚C)
  • Page 75 MSZ-G20SV - MUZ-G20SV - Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. thermistor(RT11) (Part temperature 10˚C ~ 30˚C) Normal Abnormal Indoor coil thermistor Open or short-circuit (RT12(main), RT13(sub)) 8 k" ~ 20 k" Measure the resistance with a tester.
  • Page 76 MSZ-G09SV - MSZ-G12SV - MUZ-G09SV - MUZ-G12SV - MSZ-G09SV - MSZ-G12SV - MUZ-G09SV - MUZ-G12SV - on page 76 ~ on page 83 When OPERATION INDICATOR lamp flashes 5-time. Outdoor unit does not operate. How to check inverter/ compressor Disconnect the connector between compressor and transistor module.
  • Page 77 Check of compressor Start E "Check of compressor Replace the compressor. winding" on page 77. Is compressor normal? F "Check of compressor Is the compressor operation time" on page operation time more than Replace the compressor. 77. Does the compressor 10 seconds? operate continuously? Check the refrigerant circuit.

  • Page 78: Check Of Indoor Fan Motor

    When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate. Check of indoor fan motor Replace the indoor fan motor. Yes(0 or ∞) Disconnect lead wires from CN 211 on indoor electronic Turn OFF the control P.C. board. Is resistance power supply and Measure resistance 0"(short circuit) or...
  • Page 79 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 both “parts side” and “pattern side” of indoor electronic control P.C. board visually. Varistor (NR11) Turn OFF the power supply.
  • Page 80 Cooling operates when heating is expected. Check of R.V. coil First, measure resistance of the R.V. coil to check if it is defective or not. The voltage occurs between the terminals even when the control is OFF, the connector CN 721 is not connected or the R.V. coil is open R.V.
  • Page 81 Inverter does not work. Check of power supply Outdoor terminal block Disconnect the connector between compressor and Indoor/ outdoor transistor module. connecting Turn ON power supply to indoor wire unit and press EMERGENCY Repair wiring. OPERATION switch. Three minutes after Press the power ON, is there Replace the indoor...
  • Page 82 Heating/Cooling does not operate. Check of expansion valve (LEV) 1Press the EMERGENCY OPERATION switch. 2Turn OFF the power supply. 3Turn ON the 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 83: How To Check Mis-Wiring And Serial Signal Error

    When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second or flashes once. Outdoor unit doesn’t operate. How to check mis-wiring and serial signal error 1. Turn OFF the power supply. 2. Turn ON the power supply. 3. Press the EMERGENCY OPERATION switch. 2.5 seconds OFF Is the self-check function of indoor unit indicated when 52C turns ON three minutes later? w1...
  • Page 84 MSZ-G20SV - MUZ-G20SV - on page 84 ~ on page 89 When OPERATION INDICATOR lamp flashes 3-time. Indoor fan doesn’t operate. Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. Are lead wires connected? Is soldering point of the connector correctly soldered? Resolder it.
  • Page 85 Unit doesn’t operate with the remote controller. Also, OPERATION INDICATOR lamp doesn’t light up by EMERGENCY OPERATION switch ON. Check of indoor electronic control P.C. board Check both “parts side” Turn OFF the power supply. and “pattern side” of indoor Remove indoor fan motor connector CN211 and vane motor connector CN151 electronic control P.C.
  • Page 86 When OPERATION INDICATOR lamp flashes on and off in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring Start w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds. •...
  • Page 87 When OPERATION INDICATOR lamp flashes 10-time. Check of R. V. coil • When heating operation doesn't work. Start 1. Disconnect the lead wire from the compressor. 2. Turn ON power supply, opearate the unit in HEAT mode by pressing EMERGENCY OPERATION switch. 1.
  • Page 88 When OPERATION INDICATOR lamp flashes 10-time. Check of LEV Start Turn ON power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Do you hear LEV "click, click.."? Do you touch LEV and feel it vibrate? Disconnect the connector CN771 on outdoor electronic control P.C.

  • Page 89: Check Of Outdoor Thermistor

    When OPERATION INDICATOR lamp flashes 6-time. Check of outdoor thermistor Start Disconnect the connector on the outdoor electronic control P. C. board (see below table), Replace the thermistor. is the resistance of thermistor normal? Reconnect the connector (CN663 and CN664) and disconnect the lead wire from the compressor. Turn on power supply.
  • Page 90 TEST POINT DIAGRAM AND VOLTAGE MSZ-G09SV - MSZ-G12SV - MSZ-G09SV - MSZ-G12SV - Indoor electronic control P.C. board Varistor (NR11) Fuse (F11) 250V AC 3.15A Fan motor power supply Power supply input 230V AC Room temperature thermistor (RT11) Timer short...
  • Page 91 MSZ-G20SV - Indoor electronic control P.C. board Fan motor power supply Power supply input 230V AC 5V DC Fuse (F11) 250V AC 3.15A Room temperature thermistor(RT11) Indoor coil thermistor(RT12(main)) PS132 Indoor coil thermistor(RT13(sub)) Emergency operation switch Timer short mode point (JPS, JPG) (Refer to page 63.) Receiver P.C.
  • Page 92 MUZ-G09SV - MUZ-G12SV - MUZ-G09SV - MUZ-G12SV - Outdoor electronic control P.C. board Defrost thermistor(RT61) Fin temperature thermistor(RT64) Discharge temperature thermistor(RT62) 90 100 110 120 10 20 30 40 50 60 70 80 Temperature(:) Temperature(:) Temperature(:) Discharge Defrost temperature temperature connector monitor thermistor...
  • Page 93 MUZ-G20SV - Outdoor electronic control P.C. board Defrost thermistor (RT62) Fin temperature thermistor (RT67) Discharge temperature thermistor(RT61) -20 -10 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 110 120 10 20 30 40 50 60 70 80 Temperature(:) Temperature(:) Temperature(:)
  • Page 94 MUZ-G09SV - MUZ-G09SV - Current -limit- Noise filter P.C. board ing relay (X64) Surge absorber (DSA61) Varistor (NR61) 230V AC MUZ-G12SV - MUZ-G12SV - Noise filter P.C. board Current -limit- ing relay (X64) Surge absorber (DSA61) Varistor (NR61) 230V AC...
  • Page 95 MUZ-G20SV - Noise filter P.C.board Outdoor Fan Fan speed “Low” 230V AC Outdoor Fan Fan speed “High” 230V AC 50Hz Input 230V AC FUSE (F911) AC250V 1A R.V. coil 230V AC FUSE (F912) AC250V 3.15A 230V AC 50Hz Output...
  • Page 96 MUZ-G09SV - MUZ-G12SV - MUZ-G09SV - MUZ-G12SV - Relay P.C. board R.V. coil(21S4) 230V AC Outdoor fan motor (MF61) 230V AC...

  • Page 97: Disassembly Instructions

    1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MSZ-G09SV - MSZ-G12SV - MSZ-G09SV - MSZ-G12SV - INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel.
  • Page 98 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Screw of the ground wire Photo 3 (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. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C.
  • Page 99 12-2. MSZ-G20SV - INDOOR UNIT OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the front panel (1) Remove the screw caps of the front panel. Front panel Remove the screws. (2) Pull the panel down to your side slightly and unhook the catches at the top.
  • Page 100 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screws of the ground wire (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. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C.
  • Page 101 12-3. MUZ-G09SV - MUZ-G12SV - MUZ-G09SV - MUZ-G12SV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Screws of the Photo 1 (1) Remove the screws fixing the service panel. top panel Screws (2) Pull down the service panel and remove it from the cabinet. of the (3) Remove the screws fixing the cabinet and top panel.
  • Page 102 OPERATING PROCEDURE PHOTOS 6. Removing the outdoor fan motor Photo 5 (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller fan nut. Set screws of the (3) Remove the propeller fan. outdoor fan motor Lead clamps (4) Remove lead clamps and fan motor lead wires. (5) Remove screws fixing the fan motor.
  • Page 103 12-4. MUZ-G20SV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the back panel Photo 1 (1) Remove the screws fixing the top panel and the top panel. Top panel (Photo 1) (2) Remove the screw fixing the service panel, pull down the service panel and remove it.
  • Page 104 OPERATING PROCEDURE PHOTOS 5. Removing the R.V. coil Photo 5 (1) Remove the top panel, front panel and service panel. (Refer to 1) (2) Remove the inside and outside connection electric wire and the back panel. (3) Remove R.V. coil and disconnect the connector CN912 on the noise filter P.C.
  • Page 105 OPERATING PROCEDURE PHOTOS 9. Remove the compressor and 4-way valve Photo 8 (1) Remove the top panel, front panel and service panel. (2) Remove the inside and outside connection electric wire and remove the back panel. (3) Remove the inverter assembly. (4) Recover gas from the refrigerant circuit.

  • Page 106: Parts List

    PARTS LIST MSZ-G09SV - (WH) MSZ-G12SV - (WH) MSZ-G09SV - (WH) MSZ-G12SV - (WH) 13-1. INDOOR UNIT STRUCTURAL PARTS 13-2. INDOOR UNIT HEAT EXCHANGER 1 (w) 12 (w) SCREW CATCH 7 (w) (w) These figures show about MSZ-G12SV. 13-1. INDOOR UNIT STRUCTURAL PARTS...

  • Page 107: Electrical Parts

    MSZ-G09SV - (WH) MSZ-G12SV - (WH) MSZ-G09SV - (WH) MSZ-G12SV - (WH) 13-4. ACCESSORY AND 13-3. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS SLEEVE BEARING ROOM TEMPERATURE THERMISTOR MSZ-G09SV- MSZ-G09SV- FUSE VARISTOR MSZ-G12SV- MSZ-G12SV- 13-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration.
  • Page 108 MUZ-G09SV - MUZ-G12SV - MUZ-G09SV - MUZ-G12SV - 13-5. 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 MUZ-G09SV- MUZ-G12SV- Diagram T2W E71 297 TOP PANEL T2W E93 297 TOP PANEL...
  • Page 109 MUZ-G09SV - MUZ-G12SV - MUZ-G09SV - MUZ-G12SV - 13-6. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol MUZ-G09SV- MUZ-G12SV- Remarks in Wiring Part No. Part Name Diagram T2W E66 357 1500+/420V SMOOTHING CAPACITOR T2W E68 357 2500+/420V...
  • Page 110 MSZ-G20SV - (WH) 13-7. INDOOR UNIT STRUCTURAL PARTS 13-8. INDOOR UNIT HEAT EXCHANGER CATCH Optional parts SCREW (See page 115.) 13-7. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No.
  • Page 111 MSZ-G20SV - (WH) 13-9. INDOOR UNIT FUNCTIONAL PARTS AND 13-10. ACCESSORY AND ELECTRICAL PARTS REMOTE CONTROLLER SLEEVE BEARING ROOM TEMPERATURE THERMISTOR VARISTOR 14 15 FUSE 13-9. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty/unit in Wiring...
  • Page 112 MUZ-G20SV - 13-11. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit in Wiring Parts No. Parts Name Remarks MUZ-G20SV - Diagram T2W E87 232 FRONT PANEL ASSEMBLY T2W E87 521 GRILLE M21 68N 290...
  • Page 113 MUZ-G20SV - 13-12. OUTDOOR UNIT ELECTRICAL PARTS Symbol Q'ty / unit in Wiring Remarks Parts No. Parts Name MUZ-G20SV - Diagram T2W E87 308 FIN TEMPERATURE THERMISTOR RT67 T2W E45 447 DIODE STACK DS61, DS62 M21 68K 337 REACTOR T2W E87 471 CONNECTOR POST ASSY T2W E87 424 NOISE FILTER P.C.

  • Page 114: Deodorizing Filter

    Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MSZ-G09SV - MSZ-G12SV - MAC-1300FT MSZ-G09SV - MSZ-G12SV - Air cleaning filter (White bellows type) 13-14.

  • Page 115: Optional Parts

    OPTIONAL PARTS 14-1. AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
  • Page 116 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN New publication, effective Oct. 2002 C C Copyright 2000 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Specifications subject to change without notice. Distributed in Oct. 2002. No. OB245 REVISED EDITION-B 18 Distributed in Mar. 2001. No. OB245 REVISED EDITION-A 249 Distributed in Mar.

This manual is also suitable for:

Msz-g12svMsz-g20svMuz-g12svMuz-g09svMuz-g20sv

Table of Contents