Mitsubishi Electronics MXZ-24UV manual

SER VICE MANUAL CONTENTS 1. TECHNICAL CHANGES ····································2 2. P ART NAMES AND FUNCTIONS ······················3 3. INDOOR/OUTDOOR CORRESPONDENCE T ABLE ···························4 4. INDOOR UNITS COMBINA TION ···············[...]

2 TECHNICAL CHANGES 1 MXZ-24UV - ➔ MXZ-24UV - 1. Combinations of the connectable indoor units have increased. 2. Noise filter P .C. board has changed to improve the capacity for protecting the inverter-controlled circuit when the voltage higher than the rated one is aupplied with the inverter-controlled circuit. 3. Noise filter P .C. board for ?[...]

3 P ART NAMES AND FUNCTIONS 2 OUTDOOR UNIT Air inlet Air outlet (back and side) Model indication MXZ-24UV - MXZ-24UV - E2 E1 OB287--1.qxp 03.1.16 10:29 AM Page 3[...]

4 3 INDOOR / OUTDOOR CORRESPONDENCE T ABLE ❈ There is no combination other than this table. MXZ-24UV - E1 , MXZ-24UV - E2 OUTDOOR UNIT Combination of the 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 [...]

5 07 09 12 18 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 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 3.62 4.35 6.96 1 1.1 1 7.44 7.83 1 1.01 14.40 9.18 13.19 14.40 14.40 14.40 14.40 8.94 10.05 10.05 10.05 10.05 10.05 10.05 10.0[...]

6 NOTE : Electrical data is for outdoor unit only . 07 09 12 18 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 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 5.46 6.38 9.23 1 1.1 1 9.32 9.90 12.32 13.19 1 1.35 12.75 13.19 13.19 13.19 [...]

7 5 SPECIFICA TION Outdoor model Indoor units number Indoor units total capacity (Connectable) Indoor units total capacity (Simultaneous operation) Piping total length Connecting pipe length Height difference (Indoor ~ Outdoor) Height difference (Indoor ~ Indoor) Function Capacity Dehumidification Outdoor air flow Power outlet Running current Power[...]

8 NOISE CRITERIA CUR VES 6 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMA TE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCT A VE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR BAND CENTER FREQUENCIES, Hz T est conditions. Cooling :DB35 : WB24 : Heating :DB 7 : WB 6 : COOL NOTCH HE[...]

9 OUTLINES AND DIMENSIONS 7 MXZ-24UV - MXZ-24UV - E2 E1 Unit: mm OUTDOOR UNIT 23 10 35 320 900 88 460 50 900 250 381.8 531.3 317 23 33 Handle for moving Air in Indoor and outdoor connect wiring 23 ✕ 45 hole Air in C unit connection B unit connection A unit connection 6.35 (flared) 1/4 Liquid pipe 12.7 (flared) 1/2 (A , B unit) 9.52 (flared) 3/8 ([...]

10 WIRING DIAGRAM 8 POWER SUPPLY ~/N 230V 50Hz INDOOR UNIT (A) CIRCUIT BRAKER TB1 TB2 TB3 TB4 BLU RED TB5 X64 GRN/YLW GRN CN720 CN601 0 4 X64 LD62 CN913 CN791 CN901 64 2 CN902 CN851 CN852 MF61 21S4 12 21 21 12 12 34 1234 5 6 1 2 345 67 1234 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 12 3 [...]

11 REFRIGERANT SYSTEM DIAGRAM 9 ● Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to the tables below . ● When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Dif ferent-diameter pipe. For further information on Different-diameter pipe,see [...]

12 10 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 conditio[...]

13 10-2.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. 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 <[...]

14 10-3.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 • G) =10.2(kgf/ f f • G) (1) COOL operati[...]

15 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 • G) (1) COOL operation 1 Both indoor and outdoor units are under the sa[...]

16 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 • G) (1) COOL operation 1 Both indoor and outdoor units are under the sa[...]

17 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 • G) (1) COOL operation ① ➁ Both indoor and outdoor units are under [...]

18 MICROPROCESSOR CONTROL 11 Compressor power factor Indoor unit microprocessor SSR61 Drive circuit T ransistor module Indoor Unit A Indoor Unit C Indoor Unit B Gas pipe temperature thermistor RT66, 67, 68 Muffler Accumulator Comp. H.P .S 63H2 Discharge temperature thermistor RT61 Indoor Unit A Evaporation temperature thermistor RT63 Outdoor fan mo[...]

19 Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. • The standard opening is on the straight line, which connects an each standard point in the section where divided into seven according to the operation frequency of compressor as shown in the figure below . (LEV opening is controlled in prop[...]

20 (1) LEV opening correction by suction super heat (COOL, DRY) (Suction super heat) = (Minimum gas pipe temperature) - (Evaporation temperature) When COOL and DRY , correct the LEV openings corrected from the table below (2) Separate correction (COOL,DRY) (When number of operation unit is 2 units or more) (a) Correction by the separate super heat [...]

21 1 1-2.Operational frequency range (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 ope[...]

22 1 1-3.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. (T otal time of compressor operating) Going to defrosting mode at both condition of 1 and 2 . (2) Defrosting operation 1 . Co[...]

23 <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. • When it passed 60 minutes or more since the operation has started or the last refrigerant re[...]

24 12 TROUBLESHOOTING 3. T roubleshooting procedure 1) First, check if the OPERA TION INDICA TOR lamp on the indoor unit is flashing on and off to indicate an abnormality . T o make sure, check how many times the abnormality indication is flashing on and off before starting service work. 2) If the electronic control P .C. board is supposed to be de[...]

25 Outdoor power system abnor- mality When the compressor operation has been interrupted by overcurrent protection continuously three times within 1 minute after start-up, the compressor stops operation. • Inverter output • Compressor Display Detecting method Detecting method Check points Symptom Outdoor unit does not operate. Note . LED indica[...]

26 Frequency drop by current protection When the outdoor unit input current exceeds 22.5 A, the compressor operates at reduced frequency . These symptoms do not mean any abnormality of the product, but check the following points. • Air filter clogging. • Amount of gas. • Short cycle of indoor/outdoor air flow . Display Detecting method Detect[...]

27 Part name Check method and criterion Measure the resistance using a tester . (Part temperature -10°C ~ 40°C) Defrost thermistor Evaporation / Gas pipe temperature thermistor Normal abnormal 5k Ω ~ 55k Ω Opened or short-circuited Measure the resistance using a tester , after warming up the thermistor by holding by hand. (Part temperature : [...]

28 B B Check of serial signal T urn on power supply No Ye s Ye s No No Ye s No Ye s 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) Is there voltage of 230V AC in the power supply terminal block? Is there voltage of 310V DC - 340V DC acro[...]

29 C C Check of R. V . coil No Ye s No Ye s No Ye s No Ye s No Ye s 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 OPERA TION (HEA T operation) starts. Is there voltage of 230V AC between pin1 and pin 2 at connector CN913? T urn off power supply of [...]

30 D D Check of LEV No Ye s No Ye s Start T urn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely . Is "click - click" sound heard? Or , do you feel vibration of the LEV coil with a hand? Disconnect the connector (CN791: unit A, CN792: unit B, CN793: unit C), and measure the resistance of LEV [...]

31 F F Check of thermistor Normal Ye s No Abnormal Reconnect the connector (CN661, CN662 and CN663) and disconnect the lead wire leading to the compressor . T urn on power supply to the indoor and outdoor unit. Three minutes later EMERGENCY OPERA TION starts. Thermistor Defrost thermistor Discharge temperature thermistor Evaporation temperature the[...]

32 H H Check of HPS Infinity 0 " Ye s No Ye s 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. Check the resistance between each terminal? Return CN722 to former . T urn on power supply to the indoor and [...]

33 TEST POINT DIAGRAM AND VOL T AGE MXZ-24UV - , MXZ-24UV - Electronic control P .C.board E2 E1 Gas pipe temperature thermistor Evaporation temperature thermistor Defrost temperature thermistor Resistance (k Ω ) Resistance (k Ω ) T emperature( ; ) T emperature( ; ) { Fin temperature thermistor 1.0~4.0V DC Evaporation temperature thermistor 2.5~[...]

34 Noise filter P .C.board MXZ-24UV - E1 { 230V AC OUTPUT { 230V AC INPUT { OUTDOOR F AN 230V AC { { OUTDOOR F AN 230V AC { REVERSING V AL VE 230V AC { 230V AC OUTPUT { 230V AC INPUT MXZ-24UV - E2 Replace them at the same time REVERSING V AL VE 230V AC OB287--2.qxp 03.1.16 10:30 AM Page 34[...]

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 { 12V DC { 320V DC OB287--2.qxp 03.1.16 10:30 AM Page 35[...]

36 OPERA TING PROCEDURE PHOTOS 1.Removing the compressor (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. (3)Remove the screws of the front panel , and remove it. (4)Disconnect the compressor lead wire.(T AB64,T AB65,T AB66) (5)Disconnect the outdoor electronic[...]

37 OPERA TING PROCEDURE PHOTOS 3.Removing the 4-way valve (1)Remove the screws of the top panel , and remove it.(See Photo 1.) (2)Remove the service panel,rear panel,and connect cover panel. Recover refrigerant gas. (3)Remove the electrical parts.(See Photo 2.) (4)Detach the brazed joint of 4-way valve and pipe. (See Photo 4.) 4.Removing the linear[...]

38 OPERA TING 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 OB287--2.qxp 03.1.16 10:31 AM Page 38[...]

39 14 Part numbers that are circled are not shown in the illustration. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 T2W E40 301 M21 17A 501 M21 17E 337 T2W E89 451 T2W E79 424 T2W G01 424 T2W E58 376 T2W E70 308 M21 42A 340 M21 42A 308 T2W E65 375 T2W E70 398 T2W E88 307 M21 17A 362 T2W G01 362 T2W E40 357 T2W E40 356 M21 17A 443 M21 17A 4[...]

40 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 M21 AS2 232 M21 17A 245 T92 500 800 M21 90V 646 T2W E70 653 T2W E95 653 T2W E95 655 T2W E70 651 T2W E95 651 T2W E95 655 T2W E70 652 T2W E95 652 T2W E95 655 T2W E79 290 M21 42E 644 T2W E40 247 M21 AN8 667 M21 HG1 667 T2W E70 248 M21 48A 961 T2W E79 646 M21 17A 297 T2W E40 523 M21 42E [...]

41 1 No. Parts Name Symbol in Wiring Diagram Parts No. Q'ty / unit Remarks E1 MXZ-24UV - T2W E59 704 DRAIN SOCKET ASSEMBL Y 1 DRAIN SOCKET O 1 DRAIN CAP O 2 E2 MXZ-24UV - 14-3. ACCESSOR Y P ARTS 1 MXZ-24UV - MXZ-24UV - E2 E1 OB287--2.qxp 03.1.16 10:31 AM Page 41[...]

15-1. Different-diameter pipe For different- diameter pipes MXZ-24UV MAC-454JP MAC-455JP MAC-456JP Model name Connected 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[...]

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New publication, effective Jan. 2003 Specifications subject to change without notice. C C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,L TD Distributed in Jan. 2003. No.OB287 REVISED EDITION-A 7 Distributed in Oct. 2001. No.OB287 248 Made in Japan HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAP AN OB287-[...]