Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONER
SERVICE MANUAL
Inverter-controlled multi system
Model
MXZ-24UV -
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
E2
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
4. INDOOR UNITS COMBINATION ·······················5
5. SPECIFICATION·················································7
6. NOISE CRITERIA CURVES ······························ 8
7. OUTLINES AND DIMENSIONS ························ 9
8. WIRING DIAGRAM ··········································10
Model indication
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
Revision:
• MXZ-24UV -
• Please void OB287.
CORRESPONDENCE TABLE ···························4
has been added.
E2
No. OB287
REVISED EDITION-A
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MXZ-24UV-E1
Summary of Contents for Mitsubishi Electric MXZ-24UV-E1
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONER Revision: • MXZ-24UV - has been added. • Please void OB287. No. OB287 REVISED EDITION-A SERVICE MANUAL Inverter-controlled multi system Model MXZ-24UV - MXZ-24UV - CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3. -
Page 2: Technical Changes
TECHNICAL CHANGES 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. -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS OUTDOOR UNIT (back and side) Air inlet MXZ-24UV- MXZ-24UV- Model indication Air outlet... -
Page 4: Indoor/Outdoor Correspondence Table
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). OUTDOOR UNIT MXZ-24UV- E1 , MXZ-24UV- E2 07+07 07+09 07+12 07+18 09+09 09+12... -
Page 5: Indoor Units Combination
INDOOR UNITS COMBINATION MXZ-24UV MXZ-24UV - E1 , - E2 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) - Page 6 NOTE: Electrical data is for outdoor unit only. Heating capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit A Unit B Unit C combination 1130 — — 5.46 (0.9-4.1) (270-1600) 1320 — — 6.38 (0.9-4.8) (270-1700) 1900 —...
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Page 7: Specification
SPECIFICATION Outdoor model MXZ-24UV - , 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 8: Noise Criteria Curves
NOISE CRITERIA CURVES SPL(dB LINE NOTCH COOL HEAT Test conditions. MXZ-24UV - Cooling :DB35: WB24: MXZ-24UV - 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 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm OUTDOOR UNIT MXZ-24UV - 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 10: Wiring Diagram
WIRING DIAGRAM OUTDOOR UNIT MODELS MXZ-24UV- DS62 DS61 – – – NOISE FILTER P.C.BOARD GRN/YLW POWER SUPPLY 63H2 ~/N 230V 50Hz LD62 LD61 F911 RELAY P.C. BOARD CIRCUIT BRAKER T801 TAB64 (1A) CN913 CN720 TAB65 CN901 CN902 INDOOR UNIT (A) CT62 1 2 3 4 5 6 INDOOR... -
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MXZ-24UV - Unit:mm MXZ-24UV - Indoor units Outdoor unit Piping length each indoor unit (a, b, c) Total piping length (a+b+c) Height difference between units (H) Bending point for each unit Total bending point It does not matter which unit is higher. Refrigerant pipe diameter is different according to indoor unit to be connected. -
Page 12: Performance Curves
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 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.
- 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. 1(MPa •...
- 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. 1(MPa • G) =10.2(kgf/f f •...
- 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. 1(MPa • G) =10.2(kgf/f f •...
- 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. 1(MPa • G) =10.2(kgf/f f •...
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Page 18: Microprocessor Control
MICROPROCESSOR CONTROL INVERTER MULTI SYSTEM CONTROL MXZ-24UV - 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. - 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.
- Page 20 <Correction> COOL HEAT 1 Suction super heat (MIN gas pipe temperature thermistor - Evaporation temperature thermistor) • • 2 Each correction w 1 • (Each gas pipe temperature thermistor - Evaporation temperature thermistor) • (Main pipe temperature thermistor - sub pipe temperature thermistor) •...
- 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 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 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.
- Page 23 11-6.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. •...
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Page 24: Troubleshooting
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 con- firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. -
Page 25: Troubleshooting Check Table
12-3. 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 26 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 27 12-4. 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 28 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 29 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 30 • 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 31 • 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 32 • 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 33 TEST POINT DIAGRAM AND VOLTAGE Gas pipe temperature thermistor Discharge temperature thermistor Evaporation temperature thermistor MXZ-24UV 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...
- Page 34 Noise filter P.C.board MXZ-24UV 230V AC OUTDOOR FAN OUTPUT 230V AC 230V AC INPUT REVERSING VALVE 230V AC MXZ-24UV 230V AC OUTDOOR FAN OUTPUT 230V AC Replace them at the same time 230V AC INPUT REVERSING VALVE 230V AC...
- Page 35 I.P.M P.C.board MXZ-24UV MXZ-24UV 12V DC 12V DC 320V DC Relay P.C.board MXZ-24UV 12V DC MXZ-24UV High pressure switch 12V DC Short...
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Page 36: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS MXZ-24UV - , 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 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 Photo 4 (1)Remove the screws of the top panel , and remove it.(See Photo 1.)
- Page 38 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.
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Page 39: Parts List
PARTS LIST 14-1. OUTDOOR UNIT FUNCTIONAL PARTS MXZ-24UV - MXZ-24UV - Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks E1 MXZ-24UV- E2 MXZ-24UV- Diagram T2W E40 301 MF61 RA6V60 - OUTDOOR FAN MOTOR... - Page 40 14-2. OUTDOOR UNIT STRUCTURAL PARTS MXZ-24UV - 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- MXZ-24UV- E2 Diagram M21 AS2 232 FRONT PANLE M21 17A 245 SERVICE PANEL T92 500 800...
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Page 41: Accessory Parts
14-3. ACCESSORY PARTS MXZ-24UV - MXZ-24UV - Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks MXZ-24UV - MXZ-24UV - Diagram DRAIN SOCKET O1 T2W E59 704 DRAIN SOCKET ASSEMBLY DRAIN CAP O2... -
Page 42: Optional Parts
OPTIONAL PARTS 15-1. Different-diameter pipe Connected pipes MXZ-24UV Model name diameter (mm) {9.52 — {12.7 MAC-454JP (3/8) (1/2) For different- {12.7 — {9.52 diameter MAC-455JP (1/2) (3/8) pipes {12.7 — {15.88 MAC-456JP (1/2) (5/8) 15-2. Outlet guide Changes air discharge direction. Applied unit Model name Model code... - Page 44 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 Jan. 2003 Distributed in Jan. 2003. No.OB287 REVISED EDITION-A 7 Specifications subject to change without notice. Distributed in Oct. 2001. No.OB287 248...