Mitsubishi Electronics MXZ-24UV User Manual

SERVICE MANUALCONTENTS1. TECHNICAL CHANGES ····································22. PART NAMES AND FUNCTIONS······················33. INDOOR/OUTDOOR CO

10WIRING DIAGRAM8POWER SUPPLY~/N 230V 50HzINDOORUNIT (A)CIRCUIT BRAKERTB1TB2TB3TB4BLUREDTB5X64GRN/YLWGRNCN720CN60104X64LD62CN913CN791CN901642CN902CN85

11REFRIGERANT SYSTEM DIAGRAM9● Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to th

1210The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions,since operating con

1310-2.Capacity and input correction by inverter output frequency (OUTDOOR UNIT:MXZ-24UV)NOTE 1 : The dotted line on graphs connects the frequency ra

1410-3.Outdoor low pressure and outdoor unit current 1. 07-class unit in single operationNOTE:The unit of pressure has been changed to MPa on the inte

152. 09-class unit in single operationNOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system).The conve

163. 12-class unit in single operationNOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system).The conve

174. 18-class unit in single operationNOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system).The conve

18MICROPROCESSOR CONTROL11CompressorpowerfactorIndoor unitmicroprocessorSSR61DrivecircuitTransistormoduleIndoor UnitAIndoor UnitCIndoor UnitBGas pipet

19Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit.• The standard opening is on the straight line

2TECHNICAL CHANGES1MXZ-24UV - ➔ MXZ-24UV -1. Combinations of the connectable indoor units have increased.2. Noise filter P.C. board has changed to i

20(1) LEV opening correction by suction super heat (COOL, DRY)(Suction super heat) = (Minimum gas pipe temperature) - (Evaporation temperature)When CO

2111-2.Operational frequency range(3) LEV opening correction by discharge temperatureWhen LEV correction output is 0 pulse by the suction super heat a

2211-3.Heat defrosting control(1) Conditions to enter defrosting mode1. When temperature of defrosting thermistor is -3; or less.2.When specified non-

23<Control status>The control performs when the following status are satisfied everything;• When there is 1 unit or more not operating indoor un

2412 TROUBLESHOOTING3. Troubleshooting procedure1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate

25Outdoor power system abnor-malityWhen the compressor operation has been interrupted by overcurrentprotection continuously three times within 1 minut

26Frequency drop by currentprotectionWhen the outdoor unit input current exceeds 22.5 A, the compressoroperates at reduced frequency.These symptoms do

27Part name Check method and criterionMeasure the resistance using a tester.(Part temperature -10°C ~ 40°C)Defrost thermistor Evaporation / Gas pipete

28BBCheck of serial signalTurn on power supplyNoYesYesNoNoYesNoYesStartCheck the connecting of main circuit parts and connector (CN501: I.P.M P. C. bo

29CCCheck of R. V. coilNoYesNoYesNoYesNoYesNoYesStart1. Disconnect the lead wire leading to the compressor.2. Turn on power supply to the indoor and

3PART NAMES AND FUNCTIONS2OUTDOOR UNITAir inletAir outlet(back and side)Model indicationMXZ-24UV-MXZ-24UV-E2E1OB287--1.qxp 03.1.16 10:29 AM Page 3

30DDCheck of LEVNoYesNoYesStartTurn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.Is "click - c

31FFCheck of thermistorNormalYesNoAbnormalReconnect the connector (CN661, CN662 and CN663) and disconnect the lead wire leading to the compressor. Tur

32HHCheck of HPSInfinity0"YesNoYesStart1. Disconnect the connector CN722 in the electronic control P. C. board.2. Check the resistance of HPS aft

33TEST POINT DIAGRAM AND VOLTAGEMXZ-24UV -, MXZ-24UV -Electronic control P.C.boardE2E1Gas pipe temperature thermistorEvaporation temperature thermisto

34Noise filter P.C.boardMXZ-24UV -E1{230V ACOUTPUT{230V AC INPUT{OUTDOOR FAN 230V AC{{OUTDOOR FAN 230V AC{REVERSING VALVE 230V AC{230V ACOUTPUT{230V A

35I.P.M P.C.boardMXZ-24UV -MXZ-24UV -E2E1Relay P.C.boardMXZ-24UV -MXZ-24UV -E2E1{{{{Short12V DCHigh pressure switch12V DC{12V DC{12V DC{320V DCOB287--

36OPERATING PROCEDURE PHOTOS1.Removing the compressor(1)Remove the screws of the service panel, and remove it.Recover refrigerant gas.(2)Remove the sc

37OPERATING PROCEDURE PHOTOS3.Removing the 4-way valve(1)Remove the screws of the top panel , and remove it.(SeePhoto 1.)(2)Remove the service panel,r

38OPERATING PROCEDURE PHOTOS5.Removing the reactor(1)Remove the five screws of the top panel , and remove it.(SeePhoto 1.)(2)Disconnect the reactor le

3914Part numbers that are circled are not shown in the illustration.123456789101112131415161718192021T2W E40 301M21 17A 501M21 17E 337T2W E89

43INDOOR / OUTDOOR CORRESPONDENCE TABLE❈There is no combination other than this table.MXZ-24UV- E1 , MXZ-24UV- E2OUTDOOR UNITCombination of the conne

40123456789101112131415161718192021222324M21 AS2 232M21 17A 245T92 500 800M21 90V 646T2W E70 653T2W E95 653T2W E95 655T2W E70 651T2W

411No. Parts NameSymbolin WiringDiagramParts No.Q'ty / unitRemarksE1MXZ-24UV -T2W E59 704DRAIN SOCKET ASSEMBLY1DRAIN SOCKET O1DRAIN CAP O2E2MXZ-2

15-1. Different-diameter pipeFor different-diameterpipesMXZ-24UVMAC-454JPMAC-455JPMAC-456JPModel nameConnected pipesdiameter (mm){9.52 — {12.7 (3/8)

OB287--2.qxp 03.1.16 10:31 AM Page 43

New publication, effective Jan. 2003Specifications subject to change without notice.CCCopyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,LTDDistribute

50709121807+0707+0907+1207+1809+0909+1209+1812+1212+1818+1807+07+0707+07+0907+07+1207+07+1807+09+0907+09+1207+09+1809+09+0909+09+129090909090909090909

6NOTE: Electrical data is for outdoor unit only.0709121807+0707+0907+1207+1809+0909+1209+1812+1212+1818+1807+07+0707+07+0907+07+1207+07+1807+09+0907+0

75SPECIFICATIONOutdoor modelIndoor units numberIndoor units total capacity (Connectable)Indoor units total capacity (Simultaneous operation)Piping tot

8NOISE CRITERIA CURVES690807060504030201063 125 250 500 1000 2000 4000 8000APPROXIMATETERESHOLD OFHEARING FORCONTINUOUSNOISENC-60NC-50NC-40NC-30NC-20N

9OUTLINES AND DIMENSIONS7MXZ-24UV -MXZ-24UV -E2E1Unit: mmOUTDOOR UNIT2310 353209008846050900250381.8531.33172333Handle formovingAir inIndoor and outdo