Mitsubishi Electric MXZ-24UV Service Manual Download Page 1

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SERVICE MANUAL

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················3

3. INDOOR/OUTDOOR

CORRESPONDENCE TABLE ···························4

4. INDOOR UNITS COMBINATION ·······················5

5. SPECIFICATION·················································7

6. NOISE CRITERIA CURVES ······························ 8

7. OUTLINES AND DIMENSIONS ························ 9

8. WIRING DIAGRAM ··········································10

9. REFRIGERANT SYSTEM DIAGRAM ··············11

10. PERFORMANCE CURVES ······························12

11. MICROPROCESSOR CONTROL·····················18

12. TROUBLESHOOTING······································24

13. DISASSEMBLY INSTRUCTIONS·····················36

14. PARTS LIST······················································39

15. OPTIONAL PARTS···········································42

Inverter-controlled multi system
Models

MXZ-24UV -
MXZ-24UV -

No. OB287

REVISED EDITION-B

This manual describes technical data of the outdoor unit.
For the indoor unit, refer to the service manuals No. OB229, OB227, OB252, OB212, OB239 and OC165.

Model indication

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Please void OB287 REVISED EDITION-A.

Revision B:

●

“Check of HPS” has been corrected.

OB287B--1.qxp 06.6.7 11:12 AM Page 1

Summary of Contents for MXZ-24UV

Page 1: ... 11 MICROPROCESSOR CONTROL 18 12 TROUBLESHOOTING 24 13 DISASSEMBLY INSTRUCTIONS 36 14 PARTS LIST 39 15 OPTIONAL PARTS 42 Inverter controlled multi system Models MXZ 24UV MXZ 24UV E2 E1 No OB287 REVISED EDITION B This manual describes technical data of the outdoor unit For the indoor unit refer to the service manuals No OB229 OB227 OB252 OB212 OB239 and OC165 Model indication SPLIT TYPE HEAT PUMP A...

Page 2: ...lled circuit when the voltage higher than the rated one is applied with the inverter controlled circuit 3 Noise filter P C board for E1 and E2 are not interchangeable 4 Service parts have been changed as follows according to above change The value of R resistor has been changed 10Ω 20Ω TB6 terminal block has been removed E2 E1 Revision A MXZ 24UV has been added E2 Revision B Check of HPS has been ...

Page 3: ...3 PART NAMES AND FUNCTIONS 2 OUTDOOR UNIT Air inlet Air outlet back and side Model indication MXZ 24UV MXZ 24UV E2 E1 ...

Page 4: ...he connectable indoor units 07 07 07 09 07 12 07 18 09 09 09 12 09 18 12 12 12 18 18 18 07 07 07 07 07 09 07 07 12 07 07 18 07 09 09 07 09 12 07 09 18 09 09 09 09 09 12 NOTE SLH 1AR is equivalent to class 09 9000BTU MCFH 13NV SEH 1 6AR SLH 1 6AR is equivalent to class 12 12000BTU MCFH 18NV SEH 2AR SLH 2AR is equivalent to class 18 18000BTU ...

Page 5: ... 580 1960 1620 580 2050 2280 580 2540 2980 580 3450 1900 580 2180 2730 580 3230 2980 580 3450 2980 580 3450 2980 580 3450 2980 580 3450 1850 700 3650 2080 700 4070 2080 700 4070 2080 700 4070 2080 700 4070 2080 700 4070 2080 700 4070 2080 700 4070 2080 700 4070 2 2 2 8 3 4 3 8 2 55 3 15 3 55 2 37 3 0 2 2 2 8 4 0 4 95 2 8 4 0 4 55 3 55 3 95 3 55 2 2 2 15 1 85 1 65 2 55 2 2 2 0 2 37 2 05 2 2 2 8 4 0...

Page 6: ...0 9 9 0 2 1 10 9 9 0 2 1 10 9 1130 270 1600 1320 270 1700 1900 270 2570 2300 270 2830 1930 470 2300 2050 470 2680 2550 470 3800 2730 470 3880 2350 470 3560 2640 470 3850 2730 470 3880 2730 470 3880 2730 470 3880 2730 470 3880 2420 520 3000 2500 520 3180 2500 520 3180 2500 520 3180 2500 520 3180 2500 520 3180 2500 520 3180 2500 520 3180 2500 520 3180 2 87 3 5 4 4 4 7 3 2 4 1 4 5 3 0 3 9 3 2 4 0 5 4...

Page 7: ...k k k k k Compressor Electrical data Fan motor Special remarks Capacity System Coefficient of performance C O P Outdoor unit power supply MXZ 24UV E1 MXZ 24UV E2 Single phase 230V 50Hz 2 to 3 2 Total model name 34 3 indoor units 36 2 indoor units 2 Total model name 34 3 indoor units 36 2 indoor units Max 50 Max 25 10 10 2520 25 90 0 12 08 0 6 THV247FBA ROTARY 2000 U V 0 61 V W 0 61 W U 0 61 RA6V60...

Page 8: ...000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL 0dB 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Test conditions Cooling DB35 WB24 Heating DB 7 WB 6 COOL NOTCH HEAT 46 SPL dB A 47 LINE MXZ 24UV E1 MXZ 24UV E2 ...

Page 9: ... 100 More than 500 More than 500 More than 100 More than 100 More than 350 Base bolt length Less than 25 More than 350 More than 350 Service space Air in 2 U shape notched holes Base bolt M10 Base bolt M10 Air in Air out 200 200 387 355 27 40 16 16 500 Veranda Base Rubber cushion More than 500 Note Leave front and both sides clearance fully Note Obstacles on front and rear side only The unit can b...

Page 10: ... 3 Symbols below indicate Terminal block Connector POWER SUPPLY N 230V 50Hz INDOOR UNIT A CIRCUIT BREAKER TB1 TB2 TB3 TB4 BLU RED X64 GRN YLW GRN CN720 CN601 0 4 X64 LD62 CN913 CN791 CN901 6 4 2 CN902 CN851 CN852 MF61 21S4 1 2 2 1 2 1 1 2 1 2 3 4 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6 C65 LD63 LD64 LDB LDB LD61 LDE L61 F911 SSR61 X63 X62 X61 1 6 L N 3 N INDOOR UNIT B BLU ORN CN602 1 2 3 3 N INDOOR ...

Page 11: ...Liquid 6 35 1 4 07 09 Gas 9 52 3 8 Gas 9 52 3 8 Liquid 6 35 1 4 Liquid 6 35 1 4 12 Gas 12 7 1 2 Gas 12 7 1 2 Liquid 6 35 1 4 Liquid 6 35 1 4 18 Gas 15 88 5 8 Gas 15 88 5 8 Outdoor unit union diameter For Liquid 6 35 1 4 Indoor unit A Gas 12 7 1 2 Liquid 6 35 1 4 Indoor unit B Gas 12 7 1 2 Liquid 6 35 1 4 Indoor unit C Gas 9 52 3 8 Unit mm inch Piping length each indoor unit a b c 25m Total piping ...

Page 12: ...rence 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 outlet The thermometers must be attached to the position where air speed is high 2 Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake Cover the thermometers to prevent direct rays of the...

Page 13: ...5 1 0 1 5 2 0 Frequency COOL Total input Hz 0 50 100 150 0 5 1 0 1 5 HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 Frequency HEAT Total input Hz 0 50 100 150 0 5 1 0 1 5 COOL Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 Frequency COOL Total input Hz 0 50 100 150 0 5 1 0 1 5 HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 Frequency HEAT Total input Hz 0 50 100 150 0 5 1 0 1 5 COOL C...

Page 14: ...at ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at rated frequency 4 Indoor fan runs at HI speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller Indoor Outdoor Set air flow to Hi speed Inverter output frequency is 45Hz 2 HEAT operation DB C 20 0 WB C 14 5 DB C 2 7 15 20 0 WB C 1 6 12 1...

Page 15: ...ss emergency run ON OFF button 3 Compressor starts running at rated frequency 4 Indoor fan runs at HI speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller 2Air flow speed HI 3Inverter output frequency 33Hz Indoor Outdoor Set air flow to Hi speed Inverter output frequency is 45Hz 2 HEAT operation DB C 20 0 WB C 14 5 DB C ...

Page 16: ...ss emergency run ON OFF button 3 Compressor starts running at rated frequency 4 Indoor fan runs at HI speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller 2Air flow speed HI 3Inverter output frequency 33Hz Indoor Outdoor Set air flow to Hi speed Inverter output frequency is 45Hz 2 HEAT operation DB C 20 0 WB C 14 5 DB C ...

Page 17: ...door unit 2 Press emergency run ON OFF button 3 Compressor starts running at rated frequency 4 Indoor fan runs at HI speed 5 To cancel this operation press emergency run ON OFF button or any button on remote controller Air flow speed HI Inverter output frequency 33Hz Indoor Outdoor Set air flow to Hi speed Inverter output frequency is 45Hz 2 HEAT operation DB C 20 0 WB C 14 5 DB C 2 7 15 20 0 WB C...

Page 18: ...S 63H2 Discharge temperature thermistor RT61 Indoor Unit A Evaporation temperature thermistor RT63 Outdoor fan motor MF61 x 61 x 62 x 63 Defrost thermistor RT62 LEV1 LEV2 LEV3 Indoor Unit B Indoor Unit C Outdoor unit control microprocessor Compressor primary current Compressor secondary current Fin temperature thermistor RT65 R V coil 21S4 H P S 63H1 Input signal Output signal MXZ 24UV MXZ 24UV E2...

Page 19: ...ge with the original curve Add opening provided in Difference in Capacity in the table below to the standard opening from 1 to 8 when capacity of the indoor unit is excluding code 1 Add opening provided in Difference in Operation number in the table below to determined LEV opening for each indoor unit when 2 or 3 indoor units are operated at the same time Note Even when the adjusted standard openi...

Page 20: ...stor Evaporation temperature thermistor 2 Select a minimum superheat from among them 3 Each LEV opening is corrected by difference between each superheat and minimum superheat Suction superheat S H LEV opening correction pulse more than 12 10 to12 8 to 10 6 to 8 6 or less 6 4 3 2 0 1 Suction superheat MIN gas pipe temperature thermistor Evaporation temperature thermistor 2 Each correction w 1 Each...

Page 21: ...ding to difference between the target discharge temperature and discharge temperature Min Max Rated Min Max Rated Note When the fan speed of indoor unit is totally Lo notch restrict the maximum frequency is restricted in 6 7 of the rated frequency DRY COOL COOL DRY HEAT Number of operating unit 1 2 3 4 2 3 4 5 6 7 8 3 4 5 6 7 8 9 18 20 30 40 52 68 85 80 105 110 115 32 40 46 73 70 80 90 71 18 22 26...

Page 22: ...ction control is Released 2 High pressure protection control by high pressure switch H P S High pressure switch controls the operation frequency and outdoor fan motor Control status When high pressure switch is ON When discharge pipe pressure is 2 75 MPa or more Control details a When cooling or drying The protection control decreases the compressor frequency at the speed of 10Hz a minute The comp...

Page 23: ...eed is switched according to a number of operating indoor unit and the compressor frequency Note When operation fan speed of Hi Low mode changes to VHi Hi mode by promoting those fan speeds respectively by 1 step after defrosting is operated This control is cleared when the compressor off When overheat protection of P C board temperature or fin temperature operates the outdoor fan speed is fixed t...

Page 24: ...moving the front panel the cabinet the top panel and the electronic con trol P C board 3 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires 12 2 Instruction of troubleshooting Operation start Check the outdoor unit LED...

Page 25: ...e power module the compressor stops and restarts in 3 minutes Check the inverter and compressor Refer to E E on page 30 Check the amount of gas Check the indoor outdoor air flow for short cycle Check the indoor unit air filter for clogging Discharge temperature over heat protection When the discharge temperature thermistor detects 116 C or above the compressor stops and restarts operation in 3 min...

Page 26: ... discharge temperature exceeds 110 C the compressor oper ates at reduced frequency Frequency drop by high pres sure switch protection When the high pressure exceeds 2 75MPa 28 kgf cm2 G the com pressor operates at reduced frequency In addition the fan speed changes Amount of gas Outdoor unit air passage Low discharge temperature protection When the state with low discharge temperature of which 50 ...

Page 27: ...esistance using a tester Part temperature 10 C 40 C R V coil Measure the resistance using a tester Part temperature 10 C 40 C Linear expansion valve Lead wire color Normal WHT RED RED ORN YLW BRN BRN BLU Abnormal Opened or short circuited Measure the resistance using a tester Part temperature 10 C 40 C High pressure switch HPS Pressure Normal abnormal Operation OFF HPS1 2 35 0 15MPa 24 1 5kg cm2 H...

Page 28: ... of connector CN720 in the outdoor electronic control P C board A A Check of power supply No Yes Start 1 Check the indoor unit with referring to the indoor unit service manual 2 Turn off the power supply of the indoor and outdoor unit and return the indoor outdoor unit connecting wire to former original 3 Check the connection of indoor outdoor unit connecting wire in the outdoor unit terminal bloc...

Page 29: ...CN913 in noise filter P C board Is there normal resistance to R V coil Start 1 Disconnect the lead wire leading to the compressor 2 Turn on power supply to the indoor and outdoor unit three minutes later EMERGENCY OPERATION COOL operation starts Is there voltage of 230V AC between pin1 and pin 2 at connector CN913 1 Turn off power supply of indoor and outdoor unit and disconnect the connectors CN8...

Page 30: ...upply of indoor and outdoor unit and measure the compressor winding resistance between the compressor terminals Is there resistance of 0 27 to 0 34 between the each terminals Replace the electronic control P C board with the I P M P C board Return the lead wire of compressor to former and turn on power supply to indoor and outdoor unit Three minutes later EMERGENCY OPERATION starts 1 Turn off powe...

Page 31: ...ectronic control P C board G G Check of fan motor Abnormal Normal Yes No No Yes No Yes Start Check the connection of fan motor connector connectors CN851 CN852 on electronic control P C board and connectors CN901 CN902 on noise filter P C board Disconnect the fan motor connector and measure the resistance of the fan motor winding to check the winding characteristic Is there voltage of 230V AC 1 Tu...

Page 32: ...e switch can be operated once First of all check the high pressure switch can be shorted turn OFF the power and turn ON again 1 minute later Indoor unit dose not operate difference modes When you try to run two indoor unit simultaneously one for cooling and the other for heating the unit which transmits signal to the outdoor units earlier decides the operation mode The other unit indicates as show...

Page 33: ...5 4 0V DC Discharge temperature thermistor 0 3 0 6V DC Defrost temperature thermistor 2 5 4 0V DC 12V DC 5V DC 0 5V DC LED monitor indication Gas pipe temperature thermistor 2 5 4 0V DC Room A Room C Room B High pressure switch Liner expansion valve LEV 12V DC pulse wave Outdoor fan Me 12V DC R V coil 12V DC Outdoor fan Lo 12V DC Outdoor fan ON 12V DC Serial signal Room A 5 10V DC Serial signal Ro...

Page 34: ...ter P C board MXZ 24UV E1 230V AC OUTPUT 230V AC INPUT OUTDOOR FAN 230V AC OUTDOOR FAN 230V AC REVERSING VALVE 230V AC 230V AC OUTPUT 230V AC INPUT MXZ 24UV E2 Replace them at the same time REVERSING VALVE 230V AC ...

Page 35: ...35 I P M P C board MXZ 24UV MXZ 24UV E2 E1 Relay P C board MXZ 24UV MXZ 24UV E2 E1 Short 12V DC High pressure switch 12V DC 12V DC 320V DC 12V DC ...

Page 36: ... C board connector CN913 Disconnect the fan motor connector 6 Remove the four screws of the electrical parts and remove them 7 Remove the propeller 8 Remove the screws of the separator and remove it 9 Recover gas from the refrigerant circuit 10 Detach the brazed joints of the compressor suction and dis charge pipes See Photo 3 11 Remove the three compressor nuts and remove the com pressor Photo 1 ...

Page 37: ...he linear expansion valve 1 Remove the service panel See Photo 1 Gas release is not required if the unit is pumped down 2 Remove the coil of linear expansion valve 3 Detach the brazed joint of linear expansion valve and pipe 4 way valve R V coil Brazing area LEV coils Linear expansion valves Photo 4 Photo 5 2 Removing the fan motor 1 Remove the top panel five screws the service panel four screws a...

Page 38: ... PROCEDURE PHOTOS 5 Removing the reactor 1 Remove the five screws of the top panel and remove it See Photo 1 2 Disconnect the reactor lead wire 3 Remove the two screws of the reactor and take it out Reactor Photo 6 ...

Page 39: ...AL BLOCK FIN TEMPERATURE THERMISTOR RELAY THERMISTOR SET TERMINAL BLOCK R V COIL GAS PIPE TEMPERATURE THERMISTOR RESISTOR RESISTOR POWER FACTOR CAPACITOR SMOOTHING CAPACITOR DIODE MODULE DIODE STACK I P M P C BOARD RELAY P C BOARD FUSE FUSE VARISTOR TERMINAL BLOCK MF61 L TB2 3 4 RT65 X64 RT61 62 63 TB1 21S4 RT66 67 68 R R C61 C62 C63 DS61 DS62 F801 F911 F912 NR63 TB5 1 1 1 1 1 3 1 1 1 1 1 1 1 1 2 ...

Page 40: ... ASSEMBLY UNION PIPE COVER BALL VALVE 3 8 BALL VALVE 5 8 REAR PANEL 4 WAY VALVE HIGH PRESSURE SWITCH TOP PANEL REAR GUARD HEAT EXCHANGER SIDE PANEL HIGH PRESSURE SWITCH CAPILLARY TUBE CAPILLARY TUBE SET CAPILLARY TUBE CAPILLARY TUBE MC LEV C LEV A LEV B 63H1 63H2 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 3 1 1 No Parts Name Symbol in Wiring Diagram Parts No Q ty unit MXZ 24UV Remarks T...

Page 41: ... 1 No Parts Name Symbol in Wiring Diagram Parts No Q ty unit Remarks E1 MXZ 24UV T2W E59 704 DRAIN SOCKET ASSEMBLY 1 DRAIN SOCKET O1 DRAIN CAP O2 E2 MXZ 24UV 14 3 ACCESSORY PARTS 1 MXZ 24UV MXZ 24UV E2 E1 ...

Page 42: ... pipes diameter mm 9 52 12 7 3 8 1 2 12 7 9 52 1 2 3 8 12 7 15 88 1 2 5 8 15 2 Outlet guide Changes air discharge direction Applied unit Model name Model code MXZ 24UV MAC 855SG 51H 855 610 4 534 534 386 416 51 8 150 109 4 29 2 760 8 29 2 6 4 6 4 832 386 Punched hole Punched hole 5 6 5 6 MAC 855SG 15 OPTIONAL PARTS 42 ...

Page 43: ...43 ...

Page 44: ... C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jun 2006 No OB287 REVISED EDITION B 7 Distributed in Jan 2003 No OB287 REVISED EDITION A 7 Distributed in Oct 2001 No OB287 248 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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