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Mitsubishi Electric MS-18NV, Service Manual

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SERVICE MANUAL

SPLIT-TYPE AIR CONDITIONERS

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················2

3. SPECIFICATION·················································4

4. OUTLINES AND DIMENSIONS ·························5

5. WIRING DIAGRAM ············································6

6. REFRIGERANT SYSTEM DIAGRAM ················7

7. PERFORMANCE CURVES ································8

8. MICROPROCESSOR CONTROL ····················10

9. SERVICE FUNCTIONS ····································16

10. TROUBLESHOOTING······································18

11. DISASSEMBLY INSTRUCTIONS ·····················24

12. PARTS LIST······················································28

13. OPTIONAL PARTS···········································31

Wireless type
Models

MS-18NV  -

(WH)       

·  MU-18NV  -

E4

E4

No. OB228

MS-18NV  -

E4

Summary of Contents for MS-18NV

Page 1: ...TION 4 4 OUTLINES AND DIMENSIONS 5 5 WIRING DIAGRAM 6 6 REFRIGERANT SYSTEM DIAGRAM 7 7 PERFORMANCE CURVES 8 8 MICROPROCESSOR CONTROL 10 9 SERVICE FUNCTIONS 16 10 TROUBLESHOOTING 18 11 DISASSEMBLY INSTRUCTIONS 24 12 PARTS LIST 28 13 OPTIONAL PARTS 31 Wireless type Models MS 18NV WH MU 18NV E4 E4 No OB228 MS 18NV E4 ...

Page 2: ...or has changed NH 33VMDT PH 33VPET 2 Outdoor heat exchanger has changed 3 Refrigerant filling capacity R 22 has changed 1 65kg 1 05kg E4 E3 E4 E3 1 PART NAMES AND FUNCTIONS 2 INDOOR UNIT Remote control receiving section Air cleaning filter option Deodorizing filter option Grille When the grille is open MS 18NV E4 ...

Page 3: ... OPERATE STOP ON OFF button OPERATION SELECT button FAN SPEED CONTROL button SLEEP button ON TIMER button CLOCK SET button HR button MIN button TIME SET button VANE CONTROL button OFF TIMER button RESET button SWING buttons MS 18NV E4 OUTDOOR UNIT MU 18NV E4 REMOTE CONTROLLER ...

Page 4: ...Outdoor unit Indoor unit Outdoor unit Air direction Sound level Hi Fan speed Hi Fan speed regulator Refrigerant filling capacity R 22 Refrigerating oil Model Thermistor Width Height Depth Width Height Depth Indoor unit Outdoor unit Indoor unit Outdoor unit Indoor unit Outdoor unit RT11 at25 RT12 at25 kW R h K h A A W A kW A A A W mm mm mm mm mm mm kg kg dB dB rpm rpm kg cc k k MS 18NV E4 Single ph...

Page 5: ...plate Wireless remote controller Power supply cord Lead to right 2m Lead to left 1m Wall hole 75 Installation plate Liquid line 8 0 5m Gas line 12 0 43m Insulation 50 O D 28 I D Insulation 28 Drain hose 16 Air out Air in If the right left sides or back side is vacant the front has only to be 50cm unobstructed If the front or right left sides are vacant the top has only to be 10cm unobstructed Unit...

Page 6: ... INDOOR FAN CAPACITOR SURGE ABSORBER FUSE 3 15A THERMAL FUSE 93 C DC DC CONVERTER HYBRID IC INDOOR FAN MOTOR VANE MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR TERMINAL BLOCK CONTACTOR NOTE 1 For the outdoor electric wiring refer to the outdoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block Connec...

Page 7: ...ling Strainer Unit mm Distributor Indoor unit w Max Height difference 5m wHeight difference should be within 5m regardless of which unit indoor or outdoor position is high Outdoor unit Refrigerant Piping Max length A Model Outdoor unit precharged 1050 Refrigerant piping length one way 15m 120 7m 0 10m 45 MS 18NV E4 MAX HEIGHT DIFFERENCE ADDITIONAL REFRIGERANT CHARGE R 22 g Model Refrigerant piping...

Page 8: ...t page shows the difference between the indoor intake air wet bulb temperature and the indoor outlet air wet bulb temperature for your reference at service How to measure the indoor air wet 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 air outle...

Page 9: ...a on the international system of units SI unit system The conversion factor is 1 MPa G 10 2 kgf f f G Dry bulb temperature Relative humidity 20 50 25 60 30 70 15 20 50 25 60 30 70 35 0 3 0 4 0 5 0 6 0 7 7 6 5 4 3 18 32 220V 240V 15 20 50 25 60 30 70 35 6 7 8 9 10 11 220V 240V 18 32 MU 18NV E4 MU 18NV E4 Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Outdoor low press...

Page 10: ...n state INDOOR UNIT DISPLAY SECTION Example Previous operation COOL mode of I FEEL CONTROL or COOL mode Once the mode is fixed the mode does not change by room temperature afterwards Under the ON TIMER operation the mode is determined according to the room temperature as the operation starts When the system is stopped with the OPERATE STOP ON OFF button on the remote controller and restarted withi...

Page 11: ...ure is decided by the initial room temperature 1 Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button In Auto the fan speed is as follows Initial temperature difference Room temperature minus set temperature 2 degrees or more Hi Room temperature minus set temperature Between 1 and 2 degrees Me Room temperature minus set temperature less than 1 degree Lo 2 Coil ...

Page 12: ...perate in the same cycle as the compressor When the room temperature is 23 C 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 23 C When the thermostat is ON the compressor repeats 2 minutes ON and 3 minutes OFF When the thermostat is OFF the comp...

Page 13: ...ack the rotational frequency Comparing the current rotational frequency with the target rotational frequency Hi Me Lo SLEEP the microprocessor controls IC141 and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency With this control when the fan speed is switched the rotational frequency changes smoothly 2 Fan motor lock up protection...

Page 14: ...d drops and the air flow sound from the indoor unit is decreased The indications of the remote controller are and When the FAN SPEED CONTROL button or the SLEEP button or mode change button is pressed during the SLEEP mode the SLEEP mode is released 8 8 TIMER OPERATION 1 How to set the timer 1 Press OPERATE STOP ON OFF button to start the air conditioner 2 Check that the current time is set correc...

Page 15: ...CY OPERATION switch on the front of the indoor unit The unit will start and the Operation Indicator lamp will light The first 30 minutes of operation is the test run operation This operation is for servicing The indoor fan speed runs at high notch and the system is in continuous operation The thermostat is ON After 30 minutes of test run operation the system shifts to EMERGENCY COOL MODE with a se...

Page 16: ... J1 and J2 according to the number of indoor unit as shown in Table 1 After modification push the reset button NOTE For remodelling take out the batteries at first After finish remodelling put back the batteries then push the RESET button No 1 unit No 2 unit No 3 unit No 4 unit 1 unit operation No modification 2 units operation Same as at left Cut J1 3 units operation Same as at left Same as at le...

Page 17: ...remain 2After the power is restored the unit restarts automatically according to the memory However it takes at least 3 minutes for the compressor to start running NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned off or a power failure occurs while AUTO START STOP timer is active the timer se...

Page 18: ...First check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure check the abnormality indication for 2 or 3 times before starting service work 2 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 3 When troubleshooting refer to...

Page 19: ...oor coil thermistor Refer to Test point diagram and voltage on page 23 2 time flash 2 5 second OFF 3 time flash 2 5 second OFF Start C A 1 troubleshooting check table Operation Indicator w Before taking measures make sure that the symptom reappears for accurate troubleshooting Self check table NO 1 2 Abnormal point Indoor coil thermistor Room temperatur e thermistor Indoor fan motor Indication 2 t...

Page 20: ...ter Part temperature 10 C 30 C Measure the voltage Power ON Measure the resistance between the terminals with a tester Part temperature10 C 30 C Figure P BLK R MAIN AUX RED S C WHT MAIN AUX FUSE BLK RED WHT GRY YLW BRN MAIN AUX BLK RED WHT ORN P YLW RED BLU ORN PNK ROTOR INNER PROTECTOR P Normal 8k 20k Abnormal Opened or short circuited Normal 0 95 1 17 1 92 2 36 C R C S Normal Abnormal Opened or ...

Page 21: ...ressing the EMERGENCY OPERATION switch but does not operate with the remote controller Turn on a radio to AM and press switch on the remote controller Is noise heard from radio Are there any fluorescent lights of inverter or rapid start type within the range of 1m Turn ON the power supply Measure the voltage between receiver P C board connector No 2 and No 1when remote controller button is pressed...

Page 22: ...ts side and pattern side of indoor electronic control P C board visually Replace the fuse Is fuse F11 blown Be sure to check both fuse and varistor in any case Replace the fan motor Trouble of the indoor electronic control P C board Is winding resistance of fan motor 0 Is winding resistance of vane motor 0 No Yes Replace the vane motor No Yes Yes Is varistor NR11 burnt Replace the varistor Yes Tur...

Page 23: ...e 250V AC 3 15A Power supply input 220 240V AC 5V DC Indoor coil thermistor RT12 Timer short mode point Emergency operation switch 12V DC Room temperature thermistor RT11 Room temperature thermistor RT11 Indoor coil thermistor RT12 C144 C144 JPG JP45 Auto restart function Cut the Resistor JR06 Refer page 17 ...

Page 24: ...ly and unhook the catches at the top 2 Removing the electronic control P C board 1 Remove the front panel Refer to 1 2 Remove the electrical cover 3 Remove the screw remove the terminal cover 4 Remove the screw on the terminal block 5 Unhook the catch of the lamp holder 6 Remove the receiver holder 7 Disconnect the connectors and the lead wire from 52C relay on the electronic control P C board and...

Page 25: ...electronic control P C board 5 Remove the screw of the electrical box remove the electrical box 4 Removing the indoor fan motor and the line flow fan 1 Remove the front panel 2 Remove the electrical box 3 Unhook the catches on the both sides of the nozzle assembly 4 Remove the nozzle assembly 5 Remove the screws of the bearing support 6 Remove the screw of the heat exchanger unhook the catch 7 Lif...

Page 26: ...abinet on the both side to remove the cabinet 2 Removing the electrical parts 1 Remove the service panel and the cabinet 2 Remove the following parts Compressor capacitor C1 Outdoor fan capacitor C2 Terminal block 11 2 MU 18NV OUTDOOR UNIT E4 Photo 1 Photo 3 Photo 2 Screws Screws Service panel Compressor capacitor ...

Page 27: ... 2 Remove the soundproof felt 3 Remove the terminal cover on the compressor 4 Disconnect lead wires from the glass terminal of the compressor 5 Release gas from the refrigerant circuit 6 Disconnect the welded part of the discharge pipe 7 Disconnect the welded part of the suction pipe 8 Remove nuts fixing the compressor 9 Remove the compressor Photo 5 Compressor Discharge pipe Suction pipe Compress...

Page 28: ...WH LAMP PANEL WH Symbol in Wiring Diagram Q ty unit 3PCS SET Remarks Part No NO Part Name 1 1 1 2 1 3 1 MS 18NV E4 WH Part number that is circled is not shown in the illustration Optional parts See page 31 3 5 4 6 2 1 E02 141 620 E02 138 667 E02 138 666 8 9 10 INDOOR HEAT EXCHANGER UNION LIQUID UNION GAS 6 35 15 88 1 1 1 SCREW CAP 12 1 INDOOR UNIT STRUCTURAL PARTS 12 2 INDOOR UNIT HEAT EXCHANGER 8...

Page 29: ... TERMINAL BLOCK VARISTOR RECEIVER P C BOARD SLEEVE BEARING INDOOR COIL THERMISTOR ROOM TEMPERATURE THERMISTOR FUSE THERMAL FUSE SURGE ABSORBER Symbol in Wiring Diagram Q ty unit 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 RA4V27 2PCS SET AUTO RESTART 3 15A 93 Remarks Part No NO Part Name MF MV TB NR11 RT12 RT11 F11 F12 DSAR WH MS 18NV E4 Part number that are circled are not shown in the illustration 1...

Page 30: ...8 CABINET GRILLE SERVICE PANEL OUTDOOR HEAT EXCHANGER MOTOR SUPPORT COMPRESSOR BASE OUTDOOR FAN MOTOR PROPELLER FAN COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR TERMINAL BLOCK CAPILLARY TUBE COMPRESSOR RUBBER SET STOP VALVE LIQUID STOP VALVE GAS BACK PANEL FUSE 1 1 1 1 1 1 1 1 1 1 1 1 1 4 1 1 1 1 PH 33VPET RA6V50 50 440V 3 0 440V 3 0o 2 0o700 4RUBBERS SET 6 35 15 88 250V 2A MC MF C1 C2 TB F Part num...

Page 31: ...he air outlet DO NOT reuse AIR CLEANING FILTER even if it is washed DO NOT remove or attach AIR CLEANING FILTER during unit operation 13 2 DEODORIZING FILTER DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco and odor of pets Clean DEODORIZING FILTER every two weeks If the filter is particularly dirty clean the filter more often For cleaning soak the filter in warm water...

Page 32: ...OUCHI TOKYO100 8310 TELEX J24532 CABLE MELCO TOKYO C C Copyright 1999 MITSUBISHI ELECTRIC ENGINEERING CO LTD Issued in Jan 1999 No OB228 305 Printed in Japan New publication effective Jan 1999 Specifications subject to change without notice ...

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