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Mitsubishi Electric MXZ-24UV - E1 Service Manual

Split-type, heat pump air conditioner
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONER

SERVICE MANUAL

Inverter-controlled multi system
Model
MXZ-24UV -
This manual describes technical data of the outdoor unit.
For the indoor unit refer to the service manuals No. OB229, OB227 REVISED EDITION-B, OB252, OB212,
OB239 and OC165 of corresponding models.
E1
CONTENTS
1. PART NAMES AND FUNCTIONS······················2
3. INDOOR UNITS COMBINATION ·······················4
4. SPECIFICATION·················································6
5. NOISE CRITERIA CURVES ······························ 7
6. OUTLINES AND DIMENSIONS ························ 8
7. WIRING DIAGRAM ············································9
8. REFRIGERANT SYSTEM DIAGRAM ··············10
Model indication
9. PERFORMANCE CURVES ······························11
10. MICROPROCESSOR CONTROL ····················17
11. TROUBLESHOOTING ······································23
12. DISASSEMBLY INSTRUCTIONS·····················34
13. PARTS LIST······················································37
14. OPTIONAL PARTS ······················BACK COVER
CORRESPONDENCE TABLE ···························3
No. OB287

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  Summary of Contents for Mitsubishi Electric MXZ-24UV - E1

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONER No. OB287 SERVICE MANUAL Inverter-controlled multi system Model MXZ-24UV - CONTENTS 1. PART NAMES AND FUNCTIONS······················2 2. INDOOR/OUTDOOR CORRESPONDENCE TABLE ···························3 3. INDOOR UNITS COMBINATION ·······················4 4. SPECIFICATION·················································6 5. NOISE CRITERIA CURVES ······························ 7 6. OUTLINES AND DIMENSIONS ························ 8 7.
  • Page 2: Part Names And Functions

    PART NAMES AND FUNCTIONS OUTDOOR UNIT (back and side) Air inlet MXZ-24UV- Model indication Air outlet...
  • Page 3: Indoor/Outdoor Correspondence Table

    INDOOR / OUTDOOR CORRESPONDENCE TABLE NOTE: MCFH-13NV, SEH-1.6AR is equivalent to class 12 (12000BTU). SEH-2AR is equivalent to class 18 (18000BTU). OUTDOOR UNIT MXZ-24UV- 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...
  • Page 4: Indoor Units Combination

    INDOOR UNITS COMBINATION MXZ-24UV - NOTE: Electrical data is for outdoor unit only. Cooling capacity (kw) Outdoor unit Power Indoor units Current power consumption factor Total Unit A Unit B Unit C combination — — 3.62 (0.9-2.7) (260-930) — — 4.35 (0.9-3.2) (260-1040)
  • Page 5 NOTE: Electrical data is for outdoor unit only. Heating capacity (kw) Outdoor unit Power Indoor units Current power consumption factor Unit A Unit B Unit C Total combination 1130 — — 5.46 (0.9-4.1) (270-1600) 1320 — — 6.38 (0.9-4.8) (270-1700) 1900 —...
  • Page 6: Specification

    SPECIFICATION Outdoor model MXZ-24UV - Single phase Outdoor unit power supply 230V,50Hz Indoor units number 2 to 3 Indoor units total capacity (Connectable) 2 Total model name 34 (3 indoor units) / 36 (2 indoor units) Indoor units total capacity (Simultaneous operation) 2 Total model name 34 (3 indoor units) / 36 (2 indoor units) Piping total length Max.
  • Page 7: Noise Criteria Curves

    NOISE CRITERIA CURVES SPL(dB LINE NOTCH COOL HEAT Test conditions. MXZ-24UV - Cooling :DB35: WB24: Heating :DB 7: WB 6: NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE TERESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm OUTDOOR UNIT MXZ-24UV - 2-U-shape notched holes (Base bolt M10) Rubber cushion Air in Veranda Base Air in Air out 2-12 36 Oval hole (Base bolt M10) 9.52 (flared) 3/8 (C unit) 12.7 (flared) 1/2 (A , B unit) Indoor and Handle for Air in...
  • Page 9: Wiring Diagram

    WIRING DIAGRAM MODELS MXZ-24UV- OUTDOOR UNIT DS62 DS61 – – – NOISE FILTER GRN/YLW P.C.BOARD POWER SUPPLY 63H2 ~/N 230V 50Hz LD62 LD61 F911 RELAY P.C. BOARD CIRCUIT BRAKER TAB64 (1A) T801 CN913 CN720 TAB65 CN901 CN902 INDOOR UNIT (A) CT62 1 2 3 4 5 6 INDOOR...
  • Page 10: Cool

    REFRIGERANT SYSTEM DIAGRAM MXZ-24UV - Unit:mm Compressor High pressure Discharge Refrigerant flow in cooling switch 1 temperature High pressure Refrigerant flow in heating thermistor switch 2 Reversing valve coil Capillary tube Accumulator heating ON separator [2.5 [0.6 1000 cooling OFF Ball valve with service port Unit C gas pipe temperature thermistor...
  • Page 11: Heat

    PERFORMANCE CURVES The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions, since operating conditions vary according to the areas where these units are installed. The following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 12 9-2.Capacity and input correction by inverter output frequency (OUTDOOR UNIT:MXZ-24UV) NOTE 1 : The dotted line on graphs connects the frequency range in normal operation shown by the full line and the frequency in test run shown by the point. 1.
  • Page 13 9-3.Outdoor low pressure and outdoor unit current 1. 07-class unit in single operation NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa •...
  • Page 14 2. 09-class unit in single operation NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa • G) =10.2(kgf/f f •...
  • Page 15 3. 12-class unit in single operation NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa • G) =10.2(kgf/f f •...
  • Page 16 4. 18-class unit in single operation NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa • G) =10.2(kgf/f f •...
  • Page 17: Microprocessor Control

    MICROPROCESSOR CONTROL INVERTER MULTI SYSTEM CONTROL MXZ-24UV - Output signal Input signal Compressor Compressor Compressor power primary secondary factor current current Indoor unit microprocessor Outdoor unit control microprocessor Drive SSR61 circuit Transistor module Fin temperature thermistor RT65 Accumulator Comp. H.P.S 63H2 Discharge x 61 temperature...
  • Page 18 10-1.LEV control Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. Indoor unit status LEV opening Stop of all indoor unit Opening before stop 500 pulse in 15 minutes When outdoor unit is operating, COOL : 5 pulse (full closed) some indoor unit stops and HEAT : 59 pulse (slightly opened) some operates.
  • Page 19 Difference in Difference in Standard opening capacity operation number Code2 Code3 Code4 COOL HEAT Capacity code Indoor unit <Correction> COOL HEAT 1 Suction super heat (MIN gas pipe temperature thermistor - Evaporation temperature thermistor) • • 2 Each correction w 1 •...
  • Page 20 (3) LEV opening correction by discharge temperature When LEV correction output is 0 pulse by the suction super heat at cool or dry operation, or dry operating, correct LEV is cor- rected according to the following table. The target discharge temperature is determined according to frequency zone and number of operation unit of the compressor.
  • Page 21 10-3.Heat defrosting control (1) Conditions to enter defrosting mode 1. When temperature of defrosting thermistor is -3; or less. 2.When specified non-defrosting time, is counted in the control p.c.board is satisfied. (Total time of compressor operating) Going to defrosting mode at both condition of 1 and 2. (2) Defrosting operation 1.
  • Page 22 10-6.Refrigerant recovery control on heating <Control status> The control performs when the following status are satisfied everything; • When there is 1 unit or more not operating indoor unit on heat operation. (Excluding thermo OFF) • When discharge temperature becomes 107; or more. •...
  • Page 23: Troubleshooting

    TROUBLESHOOTING 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. 2. Take care the following during servicing. 1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the unit, and then after con- firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
  • Page 24: Troubleshooting Check Table

    11-3. Troubleshooting check table Note . LED indicates "00" in the normal status. 7-segment LED display Error mode Normal If there is defect in the following parts(electronic control P.C. board, relay P.C. board, high pressure switches(63H1,63H2),indoor /outdoor fan motor , or indoor coil thermistor), the compressor may stop even with the display remained at “...
  • Page 25 Symptom Outdoor unit operates. (The compressor operates at reduced frequency.) Display Detecting method Detecting method Check points d d 8 8 Frequency drop by current When the outdoor unit input current exceeds 22.5 A, the compressor protection operates at reduced frequency. (d8) d d 9 9 Frequency drop by overload...
  • Page 26 11-4. Trouble criterion of main parts Part name Check method and criterion Measure the resistance using a tester. Defrost thermistor (Part temperature -10°C ~ 40°C) Evaporation / Gas pipe temperature thermistor Normal abnormal 5kΩ ~ 55kΩ Opened or short-circuited Measure the resistance using a tester, after warming up the thermistor by holding by hand. (Part temperature : 20°C ~40°C) Discharge temperature thermistor...
  • Page 27 Outdoor unit does not operate. (LED display: display OFF) A A Check of power supply Start Check the connecting of main circuit parts and connector (CN501: I.P.M P. C. board, CN 801: Electronic control P. C. board, CN554: relay P. C. board) Turn on power supply Is there voltage of 230V AC in the Check the power supply cable.
  • Page 28 The cooling operation or heating operation does not operate. (LED display: 0 0 0 0 ) C C Check of R. V. coil • When heating operation does not work. Start 1. Disconnect the lead wire leading to the compressor. 2.
  • Page 29 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. (LED display: 0 0 0 0 , p p 1 1 ) D D Check of LEV Start Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
  • Page 30 • When thermistor is abnormal. (When the LED display is a table below.) F F Check of thermistor Thermistor Symbol Connector, Pin No. Defrost thermistor RT62 Between CN661 pin1 and pin2 Discharge temperature thermistor RT61 Between CN661 pin3 and pin4 Evaporation temperature thermistor RT63 Between CN661 pin5 and pin6...
  • Page 31 • When the operation frequency does not go up from lowest frequency. H H Check of HPS Start 1. Disconnect the connector CN722 in the electronic control P. C. board. 2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turnd off. Infinity Check the resistance between Replace HPS (63H1).
  • Page 32 TEST POINT DIAGRAM AND VOLTAGE Discharge temperature thermistor Gas pipe temperature thermistor Evaporation temperature thermistor MXZ-24UV Defrost temperature thermistor Electronic control P.C.board Temperature(;) Defrost temperature thermistor 2.5~4.0V DC Discharge temperature thermistor 0.3~0.6V DC Evaporation temperature thermistor 2.5~4.0V DC Temperature(;) Outdoor fan ON 12V DC Outdoor fan Lo 12V DC Outdoor fan Me 12V DC R.V.
  • Page 33 Noise filter P.C.board 230V AC OUTDOOR FAN OUTPUT 230V AC 230V AC INPUT REVERSING VALVE 230V AC I.P.M P.C.board 12V DC 12V DC 320V DC Relay P.C.board 12V DC High pressure switch 12V DC Short...
  • Page 34: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS MXZ-24UV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1.Removing the compressor Photo 1 (1)Remove the screws of the service panel, and remove it. Recover refrigerant gas. (2)Remove the screws of the top panel , and remove it. Top panel (3)Remove the screws of the front panel , and remove it.
  • Page 35 OPERATING PROCEDURE PHOTOS 2.Removing the fan motor (1)Remove the top panel(five screws),the service panel(four screws),and the front panel (two screws).(See Photo 1.) (2)Disconnect the connector CN911 on the outdoor controller board. (3)Remove the propeller. (4)Remove the fan motor. 3.Removing the 4-way valve Photo 4 (1)Remove the screws of the top panel , and remove it.(See Photo 1.)
  • Page 36 OPERATING PROCEDURE PHOTOS 5.Removing the reactor (1)Remove the five screws of the top panel , and remove it.(See Photo 6 Photo 1.) (2)Disconnect the reactor lead wire. Reactor (3)Remove the two screws of the reactor , and take it out.
  • Page 37: Parts List

    PARTS LIST 13-1. OUTDOOR UNIT FUNCTIONAL PARTS MXZ-24UV - Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks MXZ-24UV- Diagram T2W E40 301 MF61 OUTDOOR FAN MOTOR M21 17A 501 PROPELLER FAN M21 17E 337...
  • Page 38 13-2. OUTDOOR UNIT STRUCTURAL PARTS MXZ-24UV - Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks MXZ-24UV- Diagram M21 AS2 232 FRONT PANLE M21 17A 245 SERVICE PANEL T92 500 800 COMPRESSOR THV247FBA...
  • Page 39: Accessory Parts

    13-3. ACCESSORY PARTS MXZ-24UV - Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks MXZ-24UV - Diagram DRAIN SOCKET O1 T2W E59 704 DRAIN SOCKET ASSEMBLY DRAIN CAP O2...
  • Page 40: Optional Parts

    5 - [6 Punxhed hole MAC-855SG HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Oct. 2001 Distributed in Oct. 2001. No.OB287 248 Specifications subject to change without notice.

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