OB287--1.qxp 03.1.16 10:29 AM Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONER Revision: • MXZ-24UV - E2 has been added. • Please void OB287. No. OB287 REVISED EDITION-A SERVICE MANUAL Inverter-controlled multi system Model MXZ-24UV MXZ-24UV - E1 E2 CONTENTS Model indication 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3. INDOOR/OUTDOOR CORRESPONDENCE TABLE ···························4 4.
OB287--1.qxp 1 03.1.16 10:29 AM Page 2 TECHNICAL CHANGES MXZ-24UV - E1 ➔ MXZ-24UV - E2 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 “E1” and “E2” are not interchangeable. 4.
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OB287--1.qxp 3 03.1.16 10:29 AM Page 4 INDOOR / OUTDOOR CORRESPONDENCE TABLE 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).
OB287--1.qxp 03.1.16 10:29 AM 4 Page 5 INDOOR UNITS COMBINATION MXZ-24UV - E1 , MXZ-24UV - E2 Cooling capacity (kW) Indoor units combination Unit A Unit B Unit C Total 07 2.2 — — 09 2.8 — — 12 4.0 — — 18 5.0 — — 07+07 2.2 2.2 — 07+09 2.2 2.8 — 07+12 2.2 4.0 — 07+18 2.15 4.95 — 09+09 2.8 2.8 — 09+12 2.8 4.0 — 09+18 2.55 4.55 — 12+12 3.55 3.55 — 12+18 3.15 3.95 — 18+18 3.55 3.55 — 07+07+07 2.2 2.2 2.2 07+07+09 2.15 2.15 2.
OB287--1.qxp 03.1.16 10:29 AM Page 6 Heating capacity (kW) Indoor units combination Unit A Unit B Unit C Total 07 3.2 — — 09 4.0 — — 12 6.0 — — 18 7.1 — — 07+07 3.2 3.2 — 07+09 3.2 4.0 — 07+12 3.2 5.4 — 07+18 2.8 6.2 — 09+09 4.0 4.0 — 09+12 3.5 5.3 — 09+18 3.25 5.75 — 12+12 4.5 4.5 — 12+18 4.1 4.9 — 18+18 4.5 4.5 — 07+07+07 2.87 2.87 2.87 07+07+09 2.75 2.75 3.5 07+07+12 2.3 2.3 4.4 07+07+18 2.15 2.15 4.7 07+09+09 2.6 3.2 3.
OB287--1.qxp 03.1.16 10:29 AM 5 Page 7 SPECIFICATION MXZ-24UV - E1 , MXZ-24UV - E2 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. 50 Connecting pipe length Max.
OB287--1.qxp 6 03.1.16 10:29 AM Page 8 NOISE CRITERIA CURVES NOTCH SPL(dB(A)) COOL 46 HEAT 47 Test conditions. Cooling :DB35: Heating :DB 7: MXZ-24UV - E1 MXZ-24UV - E2 LINE WB24: WB 6: OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.
OB287--1.qxp 03.1.16 10:29 AM 7 Page 9 OUTLINES AND DIMENSIONS Unit: mm OUTDOOR UNIT MXZ-24UV - E1 MXZ-24UV - E2 200 500 2-U-shape notched holes (Base bolt M10) Rubber cushion 27 Air in (16) Base bollt length Less than 25 200 Veranda Air in (16) 40 Air out 387 355 Base 2-12 ✕ 36 Oval hole (Base bolt M10) 10 Handle for moving 320 35 [ 9.52 (flared) 3/8 (C unit) [ 12.7 (flared) 1/2 (A , B unit) 900 Indoor and outdoor connect wiring 23✕45 hole Air in Air in 88 900 531.3 381.
OB287--1.qxp 03.1.16 10:29 AM 8 Page 10 WIRING DIAGRAM OUTDOOR UNIT MODELS MXZ-24UV- X65 BRN GRY 2 1 CN552 E1 (1A) CN852 CN722 1 2 34 RED BRN BLU ORN YLW WHT RED BRN BLU ORN YLW WHT LEV B SYMBOL LEV A~C MC MF61 R RT61 RT62 RT63 RT65 RT66,67 RT68 X67 WHT CN551 RED WHT BLK CN514 RELAY P.C.
OB287--1.qxp 03.1.16 10:29 AM 9 Page 11 REFRIGERANT SYSTEM DIAGRAM MXZ-24UV - E1 MXZ-24UV - E2 Unit:mm Indoor units a b Piping length each indoor unit (a, b, c) 25m Total piping length (a+b+c) 50m Height difference between units (H) 10m Bending point for each unit 25 Total bending point 50 Outdoor unit H H H c ❋It does not matter which unit is higher. ● Refrigerant pipe diameter is different according to indoor unit to be connected.
OB287--1.qxp 03.1.16 10:29 AM 10 Page 12 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 provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
OB287--1.qxp 03.1.16 10:29 AM Page 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. 1. 07-class unit in single operation Total input Capacity Total input Capacity 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.
OB287--1.qxp 03.1.16 10:29 AM Page 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. f • G) 1(MPa • G) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
OB287--1.qxp 03.1.16 10:29 AM Page 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. f • G) 1(MPa • G) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
OB287--1.qxp 03.1.16 10:29 AM Page 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. f • G) 1(MPa • G) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
OB287--1.qxp 03.1.16 10:29 AM Page 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. f • G) 1(MPa • G) =10.2(kgf/f (1) COOL operation ① Both indoor and outdoor units are under the same temperature/humidity condition.
OB287--1.qxp 11 03.1.16 10:29 AM Page 18 MICROPROCESSOR CONTROL INVERTER MULTI SYSTEM CONTROL MXZ-24UV - E1 MXZ-24UV - E2 Output signal Input signal Compressor power factor Indoor unit microprocessor Compressor primary current Compressor secondary current Outdoor unit control microprocessor Drive circuit SSR61 Transistor module Fin temperature thermistor RT65 Accumulator Comp. H.P.S 63H2 Discharge temperature thermistor RT61 H.P.S 63H1 x 61 x 62 x 63 R. V.
OB287--1.qxp 03.1.16 10:29 AM Page 19 11-1.LEV control Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. Determination of LEV standard opening in each indoor 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 proportion to the operation frequency.
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OB287--1.qxp 03.1.16 10:29 AM Page 21 (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 corrected according to the following table. The target discharge temperature is determined according to frequency zone and number of operation unit of the compressor. Correct the LEV opening according to difference between the target discharge temperature and discharge temperature. 11-2.
OB287--1.qxp 03.1.16 10:29 AM Page 22 11-3.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. Compressor stops for 50 seconds, Indoor fan is off, Defrosting lamp lights 2.
OB287--1.qxp 03.1.16 10:29 AM Page 23 11-6.Refrigerant recovery control on heating 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 recovery has controlled.
OB287--1.qxp 12 03.1.16 10:29 AM Page 24 TROUBLESHOOTING 12-1. 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 confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
OB287--1.qxp 03.1.16 10:29 AM Page 25 12-3. Troubleshooting check table Note . LED indicates "00" in the normal status. ❈ 7-segment LED display Error mode 00 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 “ 00 “.In any case, reset the breaker and check the above-stated parts.
OB287--1.qxp 03.1.16 10:29 AM Page 26 Symptom Display Outdoor unit operates. (The compressor operates at reduced frequency.) Detecting method Detecting method d8 (d8) Frequency drop by current protection When the outdoor unit input current exceeds 22.5 A, the compressor operates at reduced frequency.
OB287--1.qxp 03.1.16 10:29 AM Page 27 12-4. Trouble criterion of main parts Part name Defrost thermistor Evaporation / Gas pipe temperature thermistor Discharge temperature thermistor V WHT RED U BLK Outdoor fan motor WHT P ORN RED BLU YLW BLK Protector specification Short 95I15: Open Measure the resistance using a tester.
OB287--1.qxp 03.1.16 10:29 AM Page 28 Outdoor unit does not operate. (LED display: display OFF) 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 power supply terminal block? No Check the power supply cable.
OB287--1.qxp 03.1.16 10:29 AM Page 29 The cooling operation or heating operation does not operate. (LED display: 00) C Check of R. V. coil • When heating operation does not work. 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 (HEAT operation) starts. Is there voltage of 230V AC between pin1 and pin 2 at connector CN913? No Yes Turn off power supply of indoor and outdoor unit.
OB287--1.qxp 03.1.16 10:29 AM Page 30 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. (LED display: 00, p1) D Check of LEV Start Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
OB287--2.qxp 03.1.16 10:30 AM Page 31 • When thermistor is abnormal. (When the LED display is a table below.) F Check of thermistor LED E7 E6 E9 F5 F6 F7 d4 Thermistor Defrost thermistor Discharge temperature thermistor Evaporation temperature thermistor Gas pipe temperature thermistor (Unit A) Gas pipe temperature thermistor (Unit B) Gas pipe temperature thermistor (Unit C) Fin temperature thermistor Symbol RT62 RT61 RT63 RT66 RT67 RT68 RT65 Connector, Pin No.
OB287--2.qxp 03.1.16 10:30 AM Page 32 • When the operation frequency does not go up from lowest frequency. 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 each terminal? Replace HPS (63H1). 0" Return CN722 to former. Turn on power supply to the indoor and outdoor unit.
Page 33 TEST POINT DIAGRAM AND VOLTAGE MXZ-24UV - E1 , MXZ-24UV - E2 Electronic control P.C.board Temperature(;) Discharge temperature thermistor 0.3~0.6V DC Gas pipe temperature thermistor Evaporation temperature thermistor Defrost temperature thermistor Discharge temperature thermistor Defrost temperature thermistor 2.5~4.0V DC Evaporation temperature thermistor 2.5~4.0V DC Resistance (kΩ) 03.1.16 10:30 AM Resistance (kΩ) OB287--2.
OB287--2.qxp 03.1.16 10:30 AM Page 34 Noise filter P.C.
OB287--2.qxp 03.1.16 10:30 AM Page 35 I.P.M P.C.board MXZ-24UV - E1 MXZ-24UV - E2 12V DC { { 12V DC { Relay P.C.
OB287--2.qxp 13 03.1.16 10:31 AM Page 36 DISASSEMBLY INSTRUCTIONS MXZ-24UV - E1 , MXZ-24UV OUTDOOR UNIT E2 OPERATING 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.(TAB64,TAB65,TAB66) (5)Disconnect the outdoor electronic control P.C.
OB287--2.qxp 03.1.16 10:31 AM Page 37 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 (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.
OB287--2.qxp 03.1.16 10:31 AM Page 38 OPERATING 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.
OB287--2.qxp 03.1.16 10:31 AM 14 Page 39 PARTS LIST 14-1. OUTDOOR UNIT FUNCTIONAL PARTS MXZ-24UV - E1 MXZ-24UV - E2 1 18 17 16 15 14 13 12 2 11 10 9 8 7 3 5 4 6 Part numbers that are circled are not shown in the illustration. Symbol No. Parts No. Parts Name in Wiring Diagram 1 2 3 4 5 6 7 8 T2W E40 301 OUTDOOR FAN MOTOR M21 17A 501 PROPELLER FAN MF61 M21 17E 337 REACTOR T2W E89 451 ELECTRONIC CONTROL P.C. BOARD L T2W E79 424 NOISE FILTER P.C. BOARD T2W G01 424 NOISE FILTER P.C.
OB287--2.qxp 03.1.16 10:31 AM Page 40 14-2. OUTDOOR UNIT STRUCTURAL PARTS MXZ-24UV - E1 1 19 18 17 E2 MXZ-24UV - 15 16 14 13 12 11 10 9 2 3 4 5 6 7 8 Part numbers that are circled are not shown in the illustration. No. Parts No.
OB287--2.qxp 03.1.16 10:31 AM Page 41 14-3. ACCESSORY PARTS MXZ-24UV - E1 MXZ-24UV - E2 1 No. Parts No.
OB287--2.qxp 15 03.1.16 11:01 AM Page 42 OPTIONAL PARTS 15-1. Different-diameter pipe MXZ-24UV Model name Connected pipes diameter (mm) MAC-454JP {9.52 — {12.7 (3/8) (1/2) MAC-455JP {12.7 — {9.52 (1/2) (3/8) MAC-456JP {12.7 — {15.88 (1/2) (5/8) For differentdiameter pipes 15-2. Outlet guide Changes air discharge direction. Applied unit Model name Model code MXZ-24UV MAC-855SG 51H-855 109.4 51.8 29.2 150 5 - [6 Punxhed hole 534 29.2 5 - [6 Punxhed hole 6.4 386 760.8 832 760.
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OB287--2.qxp 03.1.16 10:31 AM Page 44 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2003. No.OB287 REVISED EDITION-A 7 Distributed in Oct. 2001. No.OB287 248 Made in Japan New publication, effective Jan. 2003 Specifications subject to change without notice.