Service manual

ManualsBrandsMitsubishi ManualsAir ConditionerMXZ-A26

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················7

3. INDOOR/OUTDOOR

CORRESPONDENCE TABLE ···························7

4. INDOOR UNITS COMBINATION ·····················10

5. SPECIFICATION···············································21

6. NOISE CRITERIA CURVES·····························23

7. OUTLINES AND DIMENSIONS ·······················24

8. WIRING DIAGRAM ··········································27

9. REFRIGERANT SYSTEM DIAGRAM··············30

10. PERFORMANCE CURVES······························33

11. MICROPROCESSOR CONTROL·····················47

12. TROUBLESHOOTING······································52

13. DISASSEMBLY INSTRUCTIONS·····················71

14. PARTS LIST······················································78

15. OPTIONAL PARTS···········································83

Inverter-controlled multi system

Models

MXZ-A18WV -

MXZ-A26WV -

MXZ-A32WV -

No. OB319

HFC

utilized

R410A

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MXZ-A18WV -

Indication of model name

NOTE:

•The description for MXZ-A18WV- has been transferred here from service manual OB307 REVISED

EDITION-A.

•SPECIFICATION, PERFORMANCE CURVES and PARTS LIST of MXZ-A18WV- have been partially

modified.

•This service manual describes technical data of outdoor units.

As for indoor units, refer to the service manual OB307 REVISED EDITION-A, OB321, OB327 or B329.

OB319--1.qxp 03.12.3 0:54 PM Page 1

Summary of content (85 pages)

PAGE 1
OB319--1.qxp 03.12.3 0:54 PM Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS HFC No. OB319 utilized SERVICE MANUAL R410A Inverter-controlled multi system Models MXZ-A18WV MXZ-A26WV MXZ-A32WV - E1 E1 E1 CONTENTS Indication of model name MXZ-A18WV - E1 1. TECHNICAL CHANGES ····································3 2. PART NAMES AND FUNCTIONS······················7 3. INDOOR/OUTDOOR CORRESPONDENCE TABLE ···························7 4. INDOOR UNITS COMBINATION ·····················10 5.
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OB319--1.qxp 03.12.
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OB319--1.qxp 03.12.3 0:54 PM 1 Page 3 TECHNICAL CHANGES MXZ-18TV - E2 ➔ MXZ-A18WV - E1 1. Outdoor model has changed. 2. Refrigerant has changed. (R22➔R410A) MXZ-24UV - E2 ➔MXZ-A26WV - E1 1. 2. 3. 4. 5. 6. 7. Cooling capacity has become larger. (7.1kW➔7.2kW) Combinations of connectable indoor units have increased. Capacity class of connectable indoor units has become larger. Compressor has changed. (THV247FBA➔TNB220FMCH) Outdoor fan motor has changed. (RA6V60-BA➔PM8H60-VA) Refrigerant has changed.
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OB319--1.qxp 03.12.3 0:54 PM Page 4 INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/ materials are required. Refer to the table below.
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OB319--1.qxp 03.12.3 0:54 PM Page 5 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) 4.0 Saturated liquid pressure 3.5 R410A 3.0 R22 2.5 2.0 NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system). 1.5 1.0 f [Gauge]) The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f 0.5 0.0 -0.5 -30 -20 -10 0 10 20 30 40 50 60 (:) 1.
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OB319--1.qxp 03.12.3 0:54 PM Page 6 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. Dimension of flare nut Pipe diameter mm R410A R22 6.35 17 17 9.52 22 22 12.7 26 24 15.88 29 27 3.Refrigerant oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces. 4.
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OB319--1.qxp 03.12.3 0:54 PM Page 8 MXZ-A26WV - E1 OUTDOOR UNIT Combination of the connectable indoor units MXZ-A26WV- E1 ❈There is no combination other than this table.
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OB319--1.qxp 03.12.
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OB319--1.qxp 03.12.3 0:55 PM Page 10 INDOOR UNITS COMBINATION 4 MXZ-A18WV - E1 Cooling capacity (kW) Indoor units combination Unit A Unit B 07 2.3 – 09 2.5 – 12 3.4 – 07+07 2.3 2.3 07+09 2.3 2.5 07+12 2.02 2.98 09+09 2.5 2.5 09+12 2.2 3.1 12+12 2.65 2.65 Total 2.3 (0.9-2.95) 2.5 (0.9-3.30) 3.4 (0.9-4.00) 4.6 (1.49-5.30) 4.8 (1.49-5.40) 5.0 (1.51-5.60) 5.0 (1.51-5.55) 5.3 (1.53-5.80) 5.4 (1.55-6.00) NOTE: Electrical data is for outdoor unit only.
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OB319--1.qxp 03.12.3 0:55 PM Page 11 MXZ-A26WV - E1 Cooling capacity (kW) Indoor units combination Unit A Unit B Unit C 07 2.3 – – 09 2.5 – – 12 3.4 – – 18 5.0 – – 24 6.0 – – 26 7.1 – – 07+07 2.3 2.3 – 07+09 2.1 2.7 – 07+12 2.1 3.6 – 07+18 2.01 5.18 – 07+24 1.62 5.57 – 07+26 1.52 5.67 – 09+09 2.5 2.5 – 09+12 2.52 3.37 – 09+18 2.4 4.8 – 09+24 1.96 5.23 – 09+26 1.85 5.34 – 12+12 3.4 3.4 – 12+18 2.88 4.32 – 12+24 2.4 4.
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OB319--1.qxp 03.12.3 0:55 PM Page 12 Cooling capacity (kW) Indoor units combination Unit A Unit B Unit C 07+09+26 1.2 1.54 4.45 07+12+12 1.62 2.79 2.79 07+12+18 1.36 2.33 3.5 07+12+24 1.17 2.0 4.01 07+12+26 1.12 1.92 4.16 07+18+18 1.17 3.01 3.01 07+18+24 1.02 2.64 3.52 07+18+26 0.98 2.54 3.67 09+09+09 2.36 2.36 2.36 09+09+12 2.16 2.16 2.89 09+09+18 1.8 1.8 3.6 09+09+24 1.54 1.54 4.11 09+09+26 1.47 1.47 4.25 09+12+12 1.97 2.61 2.61 09+12+18 1.
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OB319--1.qxp 03.12.3 0:55 PM Page 13 Heating capacity (kW) Indoor units combination Unit A Unit B Unit C 07 3.3 – – 09 3.6 – – 12 4.0 – – 18 7.2 – – 24 7.9 – – 26 8.6 – – 07+07 3.3 3.3 – 07+09 3.02 3.88 – 07+12 2.69 4.61 – 07+18 2.49 6.41 – 07+24 2.03 6.97 – 07+26 1.91 7.09 – 09+09 3.6 3.6 – 09+12 3.26 4.34 – 09+18 3.0 6.0 – 09+24 2.45 6.55 – 09+26 2.31 6.69 – 12+12 4.0 4.0 – 12+18 3.6 5.4 – 12+24 3.0 6.0 – 12+26 2.
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OB319--1.qxp 03.12.3 0:55 PM Page 14 Heating capacity (kW) Indoor units combination Unit A Unit B Unit C 07+09+26 1.5 1.92 5.57 07+12+12 2.03 3.48 3.48 07+12+18 1.7 2.91 4.37 07+12+24 1.46 2.51 5.02 07+12+26 1.4 2.4 5.2 07+18+18 1.46 3.76 3.76 07+18+24 1.28 3.3 4.4 07+18+26 1.23 3.17 4.58 09+09+09 3.0 3.0 3.0 09+09+12 2.7 2.7 3.6 09+09+18 2.25 2.25 4.5 09+09+24 1.92 1.92 5.14 09+09+26 1.84 1.84 5.31 09+12+12 2.45 3.27 3.27 09+12+18 2.07 2.
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OB319--1.qxp 03.12.3 0:55 PM Page 15 MXZ-A32WV - E1 Cooling capacity (kW) Indoor units combination Unit A Unit B Unit C Unit D 07 2.3 – – – 09 2.5 – – – 12 3.4 – – – 18 5.0 – – – 24 6.0 – – – 26 7.1 – – – 07+07 2.3 2.3 – – 07+09 2.1 2.7 – – 07+12 2.1 3.6 – – 07+18 2.04 5.25 – – 07+24 1.75 6.0 – – 07+26 1.66 6.19 – – 09+09 2.5 2.5 – – 09+12 2.52 3.37 – – 09+18 2.5 5.0 – – 09+24 2.11 5.64 – – 09+26 2.01 5.
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OB319--1.qxp 03.12.3 0:55 PM Page 16 Cooling capacity (kW) Indoor units combination Unit A Unit B Unit C Unit D 07+09+18 1.62 2.09 4.18 – 07+09+24 1.4 1.8 4.8 – 07+09+26 1.33 1.71 4.95 – 07+12+12 1.77 3.04 3.04 – 07+12+18 1.49 2.56 3.84 – 07+12+24 1.3 2.23 4.46 – 07+12+26 1.24 2.13 4.62 – 07+18+18 1.3 3.34 3.34 – 07+18+24 1.14 2.93 3.91 – 07+18+26 1.09 2.82 4.07 – 09+09+09 2.36 2.36 2.36 – 09+09+12 2.32 2.32 3.11 – 09+09+18 1.97 1.97 3.
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OB319--1.qxp 03.12.3 0:55 PM Page 17 Cooling capacity (kW) Indoor units combination Unit A Unit B Unit C Unit D 07+07+09+12 1.59 1.59 2.04 2.72 07+07+09+18 1.36 1.36 1.75 3.51 07+07+09+24 1.19 1.19 1.53 4.08 07+07+09+26 1.14 1.14 1.46 4.24 07+07+12+12 1.47 1.47 2.52 2.52 07+07+12+18 1.27 1.27 2.18 3.27 07+07+12+24 1.12 1.12 1.92 3.84 07+07+18+18 1.12 1.12 2.88 2.88 07+09+09+09 1.62 2.09 2.09 2.09 07+09+09+12 1.5 1.93 1.93 2.59 07+09+09+18 1.3 1.
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OB319--1.qxp 03.12.3 0:55 PM Page 18 Heating capacity (kW) Indoor units combination Unit A Unit B Unit C Unit D 07 3.3 – – – 09 3.6 – – – 12 4.0 – – – 18 7.2 – – – 24 7.9 – – – 26 8.6 – – – 07+07 3.3 3.3 – – 07+09 3.02 3.88 – – 07+12 2.69 4.61 – – 07+18 2.49 6.41 – – 07+24 2.12 7.28 – – 07+26 1.99 7.41 – – 09+09 3.6 3.6 – – 09+12 3.26 4.34 – – 09+18 3.0 6.0 – – 09+24 2.56 6.84 – – 09+26 2.42 6.98 – – 12+12 4.0 4.
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OB319--1.qxp 03.12.3 0:55 PM Page 19 Heating capacity (kW) Indoor units combination Unit A Unit B Unit C Unit D 07+09+18 1.93 2.48 4.97 – 07+09+24 1.64 2.11 5.64 – 07+09+26 1.56 2.01 5.81 – 07+12+12 2.12 3.63 3.63 – 07+12+18 1.77 3.04 4.57 – 07+12+24 1.53 2.62 5.24 – 07+12+26 1.46 2.5 5.43 – 07+18+18 1.53 3.93 3.93 – 07+18+24 1.34 3.45 4.6 – 07+18+26 1.29 3.31 4.79 – 09+09+09 3.0 3.0 3.0 – 09+09+12 2.82 2.82 3.76 – 09+09+18 2.35 2.35 4.
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OB319--1.qxp 03.12.3 0:55 PM Page 20 Heating capacity (kW) Indoor units combination Unit A Unit B Unit C Unit D 07+07+09+12 1.88 1.88 2.41 3.22 07+07+09+18 1.6 1.6 2.06 4.12 07+07+09+24 1.4 1.4 1.8 4.8 07+07+09+26 1.34 1.34 1.72 4.98 07+07+12+12 1.73 1.73 2.96 2.96 07+07+12+18 1.49 1.49 2.56 3.84 07+07+12+24 1.31 1.31 2.25 4.51 07+07+18+18 1.31 1.31 3.38 3.38 07+09+09+09 1.93 2.48 2.48 2.48 07+09+09+12 1.77 2.28 2.28 3.04 07+09+09+18 1.53 1.96 1.
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OB319--1.qxp 03.12.3 0:55 PM 5 Page 21 SPECIFICATION Outdoor model Indoor units number Indoor units total capacity (Connectable) ✽2 indoor units total capacity (Simultaneous operation) ✽2 m Piping total length m Connecting pipe length m Height difference (Indoor ~ Outdoor) m Height difference (Indoor ~ Indoor) Function kW Capacity [Rated (Min~Max.
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OB319--1.qxp 03.12.3 0:55 PM Page 22 Outdoor model Indoor units number Indoor units total capacity (Connectable)✽2 Indoor units total capacity (Simultaneous operation) ✽2 Piping total length m Connecting pipe length m Height difference (Indoor ~ Outdoor) m Height difference (Indoor ~ Indoor) m Function Capacity [Rated (Min~Max.
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03.12.3 0:55 PM Page 23 NOISE CRITERIA CURVES 6 MXZ-A18WV - E1 FAN SPEED FUNCTION SPL(dB(A)) High Cooling 49 High Heating 50 Test conditions. Cooling :DB 35: Heating :DB 7: MXZ-A26WV - E1 MXZ-A32WV - E1 LINE High Cooling 46 High Heating 48 LINE WB 24: WB 6: OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 FAN SPEED FUNCTION SPL(dB(A)) Test conditions.
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03.12.3 0:55 PM Page 25 Unit: mm 200 270 Air in (27) (16) Rubber cushion 250 2-U-shape notched holes (Base bolt M10) Air out 40 (16) 35 (200) 500 35 Less than 25 (Base bolt length) OUTDOOR UNIT MXZ-A26WV - E1 355 387 Air in Veranda 74 Base Drainage holes 3-[33 Gas pipe [9.52(flared)3/8(B,C unit) [12.7(flared)1/2(A unit) 30 900 320 Indoor and outdoor connect wiring 23O45 hole 10 900 88 C unit connection B unit connection A unit connection 33 23 380.8 531.
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OB319--1.qxp 03.12.3 0:55 PM Page 26 Unit: mm 35 200 500 250 270 (200) Veranda 2-U-shape notched holes (Base bolt M10) (27) (16) Rubber cushion Air in 35 Less than 25 (Base bolt length) OUTDOOR UNIT MXZ-A32WV - E1 40 (16) 74 355 387 Air in Base Air out Drainage holes 3-[33 Gas pipe [9.52(flared)3/8(C,D unit) [12.7(flared)1/2(A,B unit) 900 30 320 10 900 88 23 480.8 531.
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OB319--1.qxp 03.12.3 0:55 PM 8 Page 27 WIRING DIAGRAM MXZ-A18WV - E1 OUTDOOR UNIT 3 ORN X64 U SYMBOL AFM CT61 CT761 C61 C62 C63 C65 DS61 DS62 F61 F801 F911 F912 IPM L 21S4 NAME ACTIVE FILTER MODULE CURRENT TRANSFORMER CURRENT TRANSFORMER SMOOTHING CAPACITOR SMOOTHING CAPACITOR SMOOTHING CAPACITOR OUTDOOR FAN CAPACITOR DIODE MODULE DIODE MODULE FUSE(20A) FUSE(1A) FUSE(1A) FUSE(3.
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3 N 3 N 3 N TB4 TB3 TB2 YLW BLU ORN BLU RED BLU 21S4 LEV A SYMBOL LEV E MC MF NR63 N/F PFC R64 R934A, B RS1~4 RT6A~C RT61 LEV B CN901 1 2 3 4 5 X64 3 WHT BLK BLK BLK 2 BLK CN681 1 2 HPS CN662 1 2 3 4 5 6 7 8 RT6A RT6C RT6B 4 1 YLW RED 1 2 3 4 5 6 7 CN702 S R CN4 1 2 T801 RT62 RT63 RT61 RT68 LEV E (3.
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BLU N SYMBOL CB1~3 CT1, 2 CT61 F801 F911 F912 HC932 HPS IPM L LEV A~D 3 N TB5 3 N TB4 3 N TB3 3 N TB2 BRN BLU YLW BLU ORN BLU RED BLU LEV A SYMBOL LEV E MC MF NR63 N/F PFC R64 R934A, B RS1~4 RT6A~D RT61 LEV B 1 2 3 4 5 CN781 4 TAB4 LEV D CN681 1 2 HPS NAME EXPANSION VALVE COMPRESSOR OUTDOOR FAN MOTOR (INNER FUSE) VARISTOR NOISE FILTER POWER FACTOR CONTROLLER RESISTOR RESISTOR RESISTOR GAS PIPE TEMPERATURE THERMISTOR DISCHARGE TEMPERATURE THERMISTOR LEV C CN901 1 2 3 4 5 X64 3
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OB319--1.qxp 03.12.3 0:55 PM Page 30 REFRIGERANT SYSTEM DIAGRAM 9 Unit:mm MXZ-A18WV - E1 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating Discharge temperature thermistor RT61 Compressor {8 Muffler {12 Stop valve (with service port) Indoor Unit B Indoor Unit A Stop valve (with service port) Gas pipe temperature B thermistor Muffler 4-way valve {12 Gas pipe temperature A thermistor Capillary tube {1.8✕{0.6✕750 Stop valve Capillary tube {3.0✕{2.
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OB319--2.qxp 03.12.3 0:56 PM Page 31 MXZ-A26WV - E1 Unit:mm [16 Compressor R.V. coil heating ON cooling OFF Discharge temperature thermistor RT61 High-pressure switch Refrigerant flow in cooling Refrigerant flow in heating Oil separator Ball valve with service port Indoor unit C Indoor unit B Indoor unit A Unit C gas pipe temperature thermistor Unit B gas pipe temperature thermistor [16 Capillary tube [2.5✕[0.6✕1000 Service port 4-way valve [16 [9.52 [16 [16 Muffler [9.
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OB319--2.qxp 03.12.3 0:56 PM Page 32 Unit:mm MXZ-A32WV - E1 [16 Compressor R.V. coil heating ON cooling OFF Indoor unit D Indoor unit C Indoor unit B Indoor unit A Discharge temperature thermistor RT61 High-pressure switch Refrigerant flow in cooling Refrigerant flow in heating Oil separator Unit D gas pipe temperature thermistor [9.52 Unit C gas pipe temperature thermistor Unit B gas pipe temperature thermistor Unit A gas pipe temperature thermistor [16 Capillary tube [2.5✕[0.
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OB319--2.qxp 03.12.3 0:56 PM 10 Page 33 PERFORMANCE CURVES MXZ-A18WV- E1 MXZ-A26WV- E1 MXZ-A32WV- E1 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.
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OB319--2.qxp 03.12.3 0:56 PM Page 34 10-1. Capacity and the input curves MXZ-A18WV- E1 8.5 9.7 7.1 7.8 8.8 6.4 7.0 7.9 5.8 6.3 7.1 5.1 5.6 6.3 12 class 7.8 09 class 9.3 10.6 07 class 8.5 25.4 24.0 25.9 23.4 22.2 23.9 21.5 20.3 21.9 19.5 18.5 19.9 17.6 16.6 17.9 11.1 12.0 12 class 12.9 13.9 11.7 09 class 14.8 15.9 07 class 15.6 13.7 MXZ-A26WV- E1 MXZ-A32WV- E1 7.1 7.8 8.8 10.8 11.3 13.9 6.4 7.0 7.9 9.7 10.1 12.5 5.8 6.3 7.1 8.7 9.0 11.1 5.1 5.6 6.3 7.7 8.
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OB319--2.qxp 03.12.3 0:56 PM Page 35 10-2. Capacity and input correction by inverter output frequency (OUTDOOR UNIT : MXZ-A18WV) 1. 07-class unit in single operation 1.5 Capacity Total input 1.5 1.5 Capacity 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 150 Hz 0 50 Frequency 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 Total input 50 100 Frequency 150 Hz 2. 09-class unit in single operation 1.5 Capacity 1.5 Total input 1.
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OB319--2.qxp 03.12.3 0:56 PM Page 36 (OUTDOOR UNIT:MXZ-A26WV, MXZ-A32WV) 1. 07-class unit in single operation Capacity Capacity Total input Total input 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 150 Hz 0 Frequency 50 100 0 150 Hz 50 100 150 Hz 0 Frequency Frequency 50 100 150 Hz Frequency 2. 09-class unit in single operation Capacity Capacity Total input Total input 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.
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OB319--2.qxp 03.12.3 0:56 PM Page 37 6. 26-class unit in single operation Capacity Capacity Total input Total input 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.
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OB319--2.qxp 03.12.3 0:56 PM Page 38 10-3. Outdoor low pressure and outdoor unit current 1. 07-class unit in single operation (OUTDOOR UNIT : MXZ-A18WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
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OB319--2.qxp 03.12.3 0:56 PM Page 39 2. 09-class unit in single operation (OUTDOOR UNIT : MXZ-A18WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition. Dry-bulb temperature(°C) Relative humidity(%) 20 50 25 60 30 70 1.
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OB319--2.qxp 03.12.3 0:56 PM Page 40 3. 12-class unit in single operation (OUTDOOR UNIT : MXZ-A18WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition. Dry-bulb temperature(°C) Relative humidity(%) 20 50 25 60 30 70 1.
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OB319--2.qxp 03.12.3 0:56 PM Page 41 4. 07-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition. Dry-bulb temperature(°C) Relative humidity(%) 20 50 25 60 30 70 1.
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OB319--2.qxp 03.12.3 0:56 PM Page 42 5. 09-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition. Dry-bulb temperature(°C) Relative humidity(%) 20 50 25 60 30 70 1.
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OB319--2.qxp 03.12.3 0:56 PM Page 43 6. 12-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition. Dry-bulb temperature(°C) Relative humidity(%) 20 50 25 60 30 70 1.
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OB319--2.qxp 03.12.3 0:56 PM Page 44 7. 18-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation ① Both indoor and outdoor units are under the same temperature/humidity condition.
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OB319--2.qxp 03.12.3 0:56 PM Page 45 8. 24-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation ① Both indoor and outdoor units are under the same temperature/humidity condition.
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OB319--2.qxp 03.12.3 0:56 PM Page 46 9. 26-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation ① Both indoor and outdoor units are under the same temperature/humidity condition.
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OB319--2.qxp 03.12.3 0:56 PM 11 Page 47 MICROPROCESSOR CONTROL 11-1. INVERTER MULTI SYSTEM CONTROL MXZ-A18WV - E1 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 Comp. Discharge temperature thermistor RT61 Gas pipe temperature thermistor RT6B x 61 x 62 R. V.
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OB319--2.qxp 03.12.3 0:56 PM Page 48 MXZ-A26WV - E1 Output signal Input signal Indoor unit microprocessor Outdoor unit control microprocessor SSR61 Compressor primary current Fan motor drive microprocessor IPM/PFC Drive microprocessor Drive Transistor circuit module PFC module Drive circuit Fin temperature thermistor RT65 Compressor secondary current Transistor module Comp. Discharge temperature thermistor RT61 High-pressure switch 63H1 R. V.
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OB319--2.qxp 03.12.3 0:56 PM Page 49 MXZ-A32WV - E1 Output signal Input signal Indoor unit microprocessor Outdoor unit control microprocessor SSR61 Compressor primary current Fan motor drive microprocessor IPM/PFC Drive microprocessor Drive Transistor circuit module PFC module Drive circuit Fin temperature thermistor RT65 Compressor secondary current Transistor module Comp.
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OB319--2.qxp 03.12.3 0:56 PM Page 50 11-2.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.
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OB319--2.qxp 03.12.3 0:56 PM Page 51 11-6.Cooling at low outside temperature Unlike the usual fan control, the number of rotation is controlled to let the temperature of the outdoor heat exchanger become around 40: when the unit is operating in COOL mode at low outside temperature.
(a) The number of rotation will be increased when the temperature of the outdoor heat exchanger is high.
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OB319--2.qxp 12 03.12.3 0:56 PM Page 52 TROUBLESHOOTING MXZ-A18WV- E1 MXZ-A26WV- E1 MXZ-A32WV- E1 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.
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OB319--2.qxp 03.12.3 0:56 PM Page 53 12-3. Troubleshooting check table MXZ-A18WV - E1 LED 1 (Red) Lighting LED 2 (Yellow) Lighting Error mode Normal Symptom: Outdoor unit does not operate. Indication LED 1 LED 2 (Red) (Yellow) Abnormal point Detecting method Check points Lighting Once Indoor unit and LEV When the drain abnormality is detected in the indoor unit and the indoor • Check the abnormality indication on the indoor unit.
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OB319--2.qxp 03.12.3 0:56 PM Page 54 Symptom: Outdoor unit operates (The compressor operates at reduced frequency) Indication LED 1 LED 2 (Red) (Yellow) Abnormal point Detecting method Once Lighting Current protection Twice Lighting High-pressure protection When indoor gas pipe temperature exceeds 55˚C during heating. Twice Lighting Defrosting in cooling When indoor gas pipe temperature falls to 6˚C or below during cooling.
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OB319--2.qxp 03.12.3 0:56 PM MXZ-A26WV - E1 Page 55 MXZ-A32WV - E1 LED 1 (Red) Lighting LED 2 (Yellow) Lighting Error mode Normal Symptom: Outdoor unit does not operate. Indication LED 1 LED 2 (Red) (Yellow) Abnormal point Detecting method Check points Lighting Once Indoor unit and LEV When the drain abnormality is detected in the indoor unit and the indoor • Check the abnormality indication on the indoor unit.
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OB319--2.qxp 03.12.3 0:56 PM Page 56 Symptom: It is repeated that outdoor unit stops and restarts 3 minutes later Indication LED 1 LED 2 (Red) (Yellow) Abnormal point Detecting method 4 times Goes out P.C. board temperature overheat protection When the P.C. board temperature thermistor detects 70: or above. Check points • Check the outdoor unit air passage. • Check the outdoor fan motor. • Replace the outdoor electronic control P.C. board.
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OB319--2.qxp 03.12.3 0:56 PM MXZ-A18WV - E1 Page 57 MXZ-A26WV - E1 Part name Defrost thermistor Evaporation/ Gas pipe/ High-pressure protect/ Outdoor heat exchanger temperature thermistor MXZ-A32WV - E1 Check method and criterion Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C) Normal 5kΩ ~ 55kΩ abnormal Open or short-circuit Discharge temperature thermistor Measure the resistance using a tester, after warming up the thermistor by holding by hand.
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OB319--2.qxp 03.12.3 0:56 PM Page 58 Outdoor unit does not operate. (LED display: display OFF) A Check of power supply MXZ-A18WV Start Check the connecting of parts of main power supply circuit. Turn on power supply. Is there voltage of 230V AC in the power supply terminal block? No Check the power supply cable. Yes Is there voltage of 230V AC across the input terminal part in the diode module (TAB61 and TAB62)? No Is fuse (F61) blown? No Replace the noise filter P. C. board.
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OB319--2.qxp 03.12.3 0:56 PM Page 59 Outdoor unit does not operate. (LED display: Both LED1 and LED2 lighting) B Check of outdoor unit serial signal Start 1. Check the indoor unit with referring to "How to check mis-wiring and serial signal error" in service manual of indoor unit. 2. Turn off the power supply of the indoor and outdoor unit and connect the indoor/ outdoor unit connecting wire correctly. 3.
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OB319--2.qxp 03.12.3 0:56 PM Page 60 The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) C Check of R. V. coil • When heating operation does not work. Start 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage of 230V AC between pin1 and pin 2 at connector CN912? 1.
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OB319--3.qxp 03.12.3 0:58 PM Page 61 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. D Check of LEV LED display: LED1 Lighting 6 time LED2 Lighting Goes out Start Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
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OB319--3.qxp 03.12.3 0:58 PM Page 62 • When heating, room does not get warm. • When cooling, room does not get cool. E Check of inverter/ compressor MXZ-A18WV LED display: LED1 Lighting Lighting Twice LED2 Lighting Twice Goes out Start Disconnect the terminal of the compressor at terminals. 3 minutes after turning on the power supply, start EMERGENCY OPERATION. W • After the outdoor fan starts running, wait for 1 minutes or more before Measure the voltage between each measuring the voltage.
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OB319--3.qxp 03.12.3 0:58 PM Page 63 MXZ-A26/A32WV Start Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION. Measure the voltage between each lead wire leading to the compressor. U (BLK) - V (WHT) V (WHT) - W (RED) W (RED) - U (BLK) Output voltage COOL: 150V(48Hz) HEAT: 170V(64Hz) Is voltage output? W Yes No Is output balanced? Yes W • After the outdoor fan starts running, wait for 1 minutes or more before measuring the voltage.
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OB319--3.qxp 03.12.3 0:58 PM Page 64 • When thermistor is abnormal. (When the LED display is a table below.) F Check of outdoor unit thermistor MXZ-A18WV Start Disconnect the connector in the outdoor electronic control P. C. board (see below table), and measure the resistance of thermistor to check whether the thermistor is normal or not. Abnormal Replace the thermistor. Normal Reconnect the connector CN661, CN662 and CN663 on the outdoor electronic control P.C.
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OB319--3.qxp 03.12.3 0:58 PM Page 65 • Fan motor does not operate or stops operating shortly after starting the operation. G Check of outdoor fan motor MXZ-A18WV Start Check the connection of connector CN851 in the fan motor relay connector and outdoor electronic control P. C. board at the noise filter P. C. board and connector CN901 in the noise filter board. Disconnect the fan motor connector, and measure the resistance of the fan motor winding to check the winding characteristic.
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OB319--3.qxp 03.12.3 0:58 PM Page 66 • When the operation frequency does not go up from lowest frequency. H Check of HPS MXZ-A26/A32WV Start 1. Disconnect the connector CN681 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. 0" Reconnect CN681 to former. Turn on power supply to the indoor and outdoor unit.
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Resistance (k') Resistance (k') ( ( ( ( ( ( ( ( ( ( ( ( ( ( Gas pipe temperature A thermistor (RT6A) CN Gas pipe temperature B thermistor (RT6B) 661 ) Defrost thermistor (RT62) Discharge temperature thermistor (RT61) CN Evaporation temperature thermistor (RT63) 662 High-pressure protect thermistor (RT68) CN772 Room B Linear expansion valve (LEV) 12V DC pulse wave ) CN663 Fin temperature thermistor (RT65) Common (+) R.V.
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OB319--3.qxp 03.12.3 0:58 PM Page 68 Defrost temperature thermistor (RT62) Evaporation temperature thermistor (RT63) Gas pipe temperature thermistor (RT6A,6B) Fin temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) MXZ-A26WV - E1 MXZ-A32WV - E1 Outdoor electronic control P.C.
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OB319--3.qxp 03.12.3 0:58 PM Page 69 MXZ-A18WV - E1 Noise filter P.C.board F912 FUSE 3.15A/250V NR63 VARISTOR 230V AC 50Hz Input F911 FUSE 1A/250V 230V AC 50Hz Output CN912 R.V. Coil 230V AC CN911 Outdoor Fan Fan speed “High” 230V AC CN911 Outdoor Fan Fan speed “Low” 230V AC MXZ-A26WV - E1 MXZ-A32WV - E1 Noise filter P.C.board Electronic control Power board board { { { 230V AC 50Hz Input R.V. coil 230V AC { 230V AC 50Hz Output F911 FUSE 1A/250V F912 FUSE 3.
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OB319--3.qxp 03.12.3 0:58 PM Page 70 MXZ-A26WV - E1 MXZ-A32WV - E1 Outdoor Power board Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Output (Red) (+) 1 (–) 3 (White) Connect to the earth ) Signal reception (From electronic control P.C. board) 5V DC pulse wave CN3 Fin temperature thermistor CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C.
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OB319--3.qxp 03.12.3 0:58 PM 13 Page 71 DISASSEMBLY INSTRUCTIONS 13-1. MXZ-A18WV - E1 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet. Photo 1 1. Removing the cabinet. (1) Remove the screws of the top panel. (2) Remove the top panel. (3) Remove the screw of the service panel. (4) Remove the service panel. (5) Remove the screws of the front panel.
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OB319--3.qxp 03.12.3 0:58 PM Page 72 PHOTOS OPERATING PROCEDURE 3. Removing the Outdoor Electronic control P.C. board. Photo 5 Screws of the cover (1) Remove the top panel, service panel and front panel. (2) Remove the connector coming out of the compressor. (3) Remove the compressor connector, compressor relay connector on the electronic control P.C. board side, terminal of reactor and terminals of TAB4 and X64 of the noise filter P.C. board coming out of the electronic control P.C. board. (Fig.
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OB319--3.qxp 03.12.3 0:59 PM Page 73 OPERATING PROCEDURE PHOTOS 5. Removing the thermistor Photo 8 Discharge temperature thermistor, defrost, evaporator temperature, high-pressure protect, gas pipe temperature A and gas pipe temperature B (1) Remove the top panel, service panel, front panel. (2) Remove indoor/outdoor connecting wire and power supply cable. (3) Remove thermistor connector (CN661, CN662) from the electronic control P.C. board. (4) Remove the inverter assembly.
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OB319--3.qxp 03.12.3 0:59 PM Page 74 PHOTOS OPERATING PROCEDURE 6. Removing the compressor/4-way valve Photo 11 (1) Collect refrigerant from refrigerant circuit. Caution: If collecting has not been done enough, refrigerating machine oil may spout out or harmful substance may be generated during welding work. (2) Remove indoor/outdoor connecting wire and power supply cable. (3) Remove the top panel, service panel, front panel and back panel. (4) Remove the inverter assembly.
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OB319--3.qxp 03.12.3 0:59 PM Page 75 13-2. MXZ-A26WV - E1 OUTDOOR UNIT MXZ-A32WV - E1 OPERATING PROCEDURE PHOTOS 1. Removing the compressor Photo 1 (1)Remove the screws of the top panel, and remove it. (2)Remove the screws of the service panel, and remove it. Recover refrigerant gas. (3)Remove the screws of the front panel, and remove it. (4)Disconnect the compressor lead wire from terminal of compressor. (U, V, W) (5)Disconnect the outdoor electronic control P.C. board connectors.
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OB319--3.qxp 03.12.3 0:59 PM Page 76 PHOTOS OPERATING PROCEDURE Photo 4 2. Removing the fan motor (1)Remove the top panel, the service panel, and the front panel. (Photo 1) (2)Disconnect the connector CN911 on the outdoor electronic control P.C. board. (3)Remove the propeller. (4)Remove the fan motor. Screws of the outdoor fan motor Propeller Sound proof felt Propeller nut Separator 3. Removing the 4-way valve Compressor nuts Photo 5 (1)Remove the top panel.
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OB319--3.qxp 03.12.3 0:59 PM Page 77 OPERATING PROCEDURE PHOTOS 5. Removing the reactor (1)Remove the top panel. (Photo 1) (2)Disconnect the reactor lead wire. (3)Remove the screws of the reactor, and remove the reactor.
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OB319--3.qxp 14 03.12.3 0:59 PM Page 78 PARTS LIST MXZ-A18WV - E1 14-1. OUTDOOR UNIT FUNCTIONAL PARTS AND STRUCTURAL PARTS 22 20 19 18 21 16 15 14 17 13 12 11 10 9 1 2 3 5 6 4 7 8 Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Parts No.
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OB319--3.qxp 03.12.3 0:59 PM Page 79 MXZ-A18WV - E1 14-2. OUTDOOR UNIT ELECTRICAL PARTS 14-3. ACCESSORY 9 13 7 8 14 1 3 2 4 5 6 14-2. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 Parts No. E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 735 735 735 573 735 735 735 735 735 735 735 737 337 444 374 375 241 382 306 308 450 309 385 382 Parts Name REACTOR NOISE FILTER P.C.
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OB319--3.qxp 03.12.3 0:59 PM Page 80 MXZ-A26WV - E1 MXZ-A32WV - E1 14-4.
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OB319--3.qxp 03.12.3 0:59 PM Page 81 14-4. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Parts No.
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OB319--3.qxp 03.12.3 0:59 PM Page 82 MXZ-A26WV - E1 MXZ-A32WV - E1 14-5. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 12 11 10 9 3 7 6 4 1 8 5 2 Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Parts No.
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OB319--3.qxp 03.12.3 0:59 PM Page 83 MXZ-A26WV- E1 MXZ-A32WV- E1 14-6. ACCESSORY Parts No. No. 1 Q'ty/unit Symbol in Wiring MXZ-A26WV- E1 MXZ-A32WVDiagram Parts Name 1 T2W E59 704 DRAIN SOCKET ASSEMBLY 15 1 E1 Remarks DRAIN SOCKET O1 DRAIN CAP O2 1 OPTIONAL PARTS 15-1. Different-diameter pipe MXZ-A18WV Model name Connected pipes diameter (mm) Length A Length B Length C For differentdiameter pipes MAC-A454JP {9.52 — {12.7 (3/8) (1/2) {9.52 (3/8) {12.
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OB319--3.qxp 03.12.3 0:59 PM Page 84 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Dec. 2003. No.OB319 7 Made in Japan New publication, effective Dec. 2003 Specifications subject to change without notice.
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