Table of Contents
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SPLIT-TYPE,HEAT PUMP AIR CONDITIONER
SERVICE MANUAL
Inverter-controlled multi system
Model
MXZ-18TV -
This manual describes technical data of outdoor unit.
For the indoor unit refer to the service manuals No. OB229, OB227 REVISED EDITION-B, OB252 REVISED EDI-
TION-A, and OC165 of corresponding models.
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
CORRESPONDENCE TABLE ···························3
4. INDOOR UNITS COMBINATION ·······················3
5. SPECIFICATION·················································4
6. NOISE CRITERIA CURVES ······························ 5
7. OUTLINES AND DIMENSIONS ························ 6
8. WIRING DIAGRAM ············································7
Model indication
9. REFRIGERANT SYSTEM DIAGRAM ················8
10. PERFORMANCE CURVES ································9
11. MICROPROCESSOR CONTROL·····················14
12. TROUBLESHOOTING······································19
13. DISASSEMBLY INSTRUCTIONS·····················29
14. PARTS LIST······················································32
15. OPTIONAL PARTS···········································34
No. OB280
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Related Manuals for Mitsubishi Electric MXZ-18TV
Summary of Contents for Mitsubishi Electric MXZ-18TV
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Page 1: Table Of Contents
SPLIT-TYPE,HEAT PUMP AIR CONDITIONER No. OB280 SERVICE MANUAL Inverter-controlled multi system Model MXZ-18TV - CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. INDOOR/OUTDOOR CORRESPONDENCE TABLE ···························3 4. INDOOR UNITS COMBINATION ·······················3 5. SPECIFICATION·················································4 6. NOISE CRITERIA CURVES ······························ 5 7. -
Page 2: Technical Changes
TECHNICAL CHANGES MXZ-18RV - MXZ-18TV - 1. The combination pattern of indoor unit has increased. 2. Outside dimension of the outdoor equipment changed. 3. Ball valve has changed to stop valve. 4. Accumulator has been removed. 5. Hight pressure switch has been removed. -
Page 3: Indoor/Outdoor Correspondence Table
07+09 07+12 07+SEH-1.6 09+09 09+12 09+SEH-1.6 12+12 There is no combination other than this table. INDOOR UNITS COMBINATION MXZ-18TV - NOTE: Electrical data is for outdoor unit only. Cooling capacity (kw) Outdoor unit Current Power Indoor units power consumption factor... -
Page 4: Specification
SPECIFICATION Outdoor model MXZ-18TV - Single phase Outdoor unit power supply 230V,50Hz Indoor units number Indoor units total capacity (Connectable) Total model name 24 indoor units total capacity (Simultaneous operation) Total model name 24 Piping total length Max. 30 (chargeless 20) Connecting pipe length Max. -
Page 5: Noise Criteria Curves
NOISE CRITERIA CURVES SPL(dB LINE NOTCH Cooling Heating Test conditions. MXZ-18TV - 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 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm OUTDOOR UNIT MXZ-18TV - REQUIRED SPACE Even if the right / left sides or back side are vacant, the top has to be at least 100mm unobstructed. Bolt pitch for installation Drainage hole {33 347.5... -
Page 7: Wiring Diagram
WIRING DIAGRAM MODELS MXZ-18TV- OUTDOOR UNIT TO INDOOR UNIT No.A CONNECTING TO INDOOR UNIT No.B CONNECTING DS61 DS62 FUSE(20A) POWER 1 2 3 TAB1 SUPPLY TAB2 230V~ TAB4 CT61 50Hz GRN/YLW CIRCUIT GROUND BREAKER NOISE FILTER P.C.BOARD 3 2 1... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MXZ-18TV - Unit:mm R.V. coil heating ON Discharge cooling OFF Compressor temperature Refrigerant flow in cooling thermistor Refrigerant flow in heating Muffler Stop valve (with service port) 4-way valve Gas pipe temperature B thermistor Indoor Muffler Unit B... -
Page 9: 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 10 10-2. Capacity and input correction by inverter output frequency (OUTDOOR UNIT:MXZ-18TV) NOTE 1 : Inverter output frequency : COOL 55Hz,HEAT 80Hz NOTE 2 : 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.
- Page 11 10-3. Outdoor low pressure and outdoor unit current 1. 07-class unit in single operation (OUTDOOR UNIT : MXZ-18TV) 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.
- Page 12 2. 09-class unit in single operation (OUTDOOR UNIT : MXZ-18TV) 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.
- Page 13 3. 12-class unit in single operation (OUTDOOR UNIT : MXZ-18TV) 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.
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Page 14: Microprocessor Control
MICROPROCESSOR CONTROL INVERTER MULTI SYSTEM CONTROL MXZ-18TV - 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 RT67 Comp. Discharge temperature... - Page 15 11-1.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 16 Difference in Difference in Standard opening capacity operation number Code2 Code3 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 17 (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 18 11-5.Discharge temperature protection control This protection controls the compressor ON/OFF and operation frequency according to temperature of the discharge temp. thermistor. (1) Compressor ON/OFF When temperature of the discharge temp. thermistor exceeds 116;, the control stops the compressor. When temperature of the discharge temp. thermistor is 80; or less, the controls starts the compressor. (2) Compressor operation frequency When temperature of the discharge temp.
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Page 19: 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 20 Troubleshooting check table <OUTDOOR UNIT> LED 1 (red) LED 2 (yellow) Error mode Lighting Lighting Normal Symptom: Outdoor unit does not operate. Indication Abnormal point Detecting method Check points LED 1 LED 2 (red) (Yellow) • Check the inverter / compressor. When the compressor operation has been interrupted by overcurrent Lighting Twice...
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Page 21: Cooling
Symptom: Oudtoor unit operates (The compressor operates at reduced frequency) Indication Abnormal point Detecting method Check points LED 1 LED 2 (red) (Yellow) Once Lighting Current protection When the outdoor unit input current exceeds 15.5A. Twice Lighting Overload protection When the compressor load exceed the specified value. These symptoms do not mean any abnor- High pressure protec- mality of the product, but check the follow-... - Page 22 A A Check of power supply Start Check the connecting of main circuit parts . Turn on power supply Is there voltage of 230V AC in the Check the power supply cable. power supply terminal block? Is there voltage of 230V AC across the Is there voltage of 325V DC across the Replace the noise input terminal part in the diode module...
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Page 23: Heating
C 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. 1. - Page 24 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. Is "click - click" sound heard? Normal Or, do you feel vibration of the LEV coil with a hand? Disconnect the connector Replace the outdoor electronic (CN771: unit A, CN772: unit B), and measure the...
- Page 25 F F Check of outdoor unit thermistor Start Abnormal Disconnect the connector in the outdoor electronic control P. C. board (see below table), Replace the thermistor and measure the resistance of thermistor to check whether the thermistor is normal or not. Normal Reconnect the connector (CN661, CN663 and CN664) and disconnect the lead wire leading to the compressor.
- Page 26 H H The other cases Indoor unit dose not operate. (difference modes) • When you try to run two indoor unit simultaneously, one for cooling and the other for heating, the unit which transmits signal to the outdoor units earlier decides the operation mode. The other unit indicates as shown in the figure below.
- Page 27 TEST POINT DIAGRAM AND VOLTAGE MXZ-18TV Outdoor Electronic control P.C.board LED monitor indication (LED 1) LED monitor indication (LED 2) Serial signal Room B 5 ~ 10V DC Serial signal Room A 5 ~ 10V DC Evaporation temperature thermistor (RT63)
- Page 28 Noise filter P.C.board Outdoor Fan Fan speed “Hi” 250V AC Outdoor Fan Fan speed “Lo” 250V AC 230V AC 50Hz Input Reversing valve 230V AC 230V AC 50Hz Output...
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Page 29: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS MXZ-18TV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the top panel ~ back panel Top panel Photo 1 (1) Remove the screws fixing the top panel and remove it. (Photo 1) (2) Remove the screw fixing the service panel, next pull down Back panel the service panel and remove it from the cabinet. - Page 30 OPERATING PROCEDURE PHOTOS 5. Removing the 4-way coil Photo 5 (1) Remove the top panel, front cover and service panel. (2) Remove the inside and outside connection electric wire, next remove the back panel. (3) Remove 4-way coil and disconnect the noise filter P.C. board connectors CN722 6.
- Page 31 OPERATING PROCEDURE PHOTOS 9. Remove the compressor (1) Remove the top panel, front cover, service panel. Photo 9 (2) Remove the inside and outside connection electric wire, next remove the back panel. (3) Remove the inverter assembly. (4) Can have the service of compression, 4-way and other refrigerant circuit..
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Page 32: Parts List
PARTS LIST 14-1. OUTDOOR UNIT FUNCTIONAL PARTS MXZ-18TV - Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks MXZ-18TV- Diagram T2W E87 308 RT67 FIN TEMPERATURE THERMISTOR T2W E45 447 DS61, DS62 DIODE STACK M21 68K 337 REACTOR... - Page 33 14-2. OUTDOOR UNIT STRUCTURAL PARTS MXZ-18TV - Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks MXZ-18TV- Diagram T2W E87 232 FRONT PANEL ASSEMBLY T2W E87 521...
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Page 34: Optional Parts
OPTIONAL PARTS 15-1. Different-diameter pipe Unit : mm (inch) Connected pipes Length Length Length MXZ-18TV Model name Model code diameter (mm) For different- {9.52 {12.7 {9.52 — {12.7 diameter MAC-454JP 51H-454 (3/8) (1/2) (3/8) (1/2) pipes... - Page 36 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 Mar. 2001 Distributed in Mar. 2001. No.OB280 49 Specifications subject to change without notice. Made in Japan...