Mitsubishi Electric MXZ-2A30VA

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ··································· 2

2. PART NAMES AND FUNCTIONS····················· 8

3. INDOOR/OUTDOOR

CORRESPONDENCE TABLE ························ 10

4. INDOOR UNITS COMBINATION ···················· 14

5. SPECIFICATION·············································· 61

6. NOISE CRITERIA CURVES···························· 66

7. OUTLINES AND DIMENSIONS ······················ 68

8. WIRING DIAGRAM·········································· 75

9. REFRIGERANT SYSTEM DIAGRAM············· 87

10. PERFORMANCE CURVES····························· 97

11. ACTUATOR CONTROL··································115

12. SERVICE FUNCTIONS···································116

13. TROUBLESHOOTING··································· 120

14. DISASSEMBLY INSTRUCTIONS·················· 145

15. PARTS LIST··················································· 160

16. RoHS PARTS LIST········································ 172

17. OPTIONAL PARTS······················BACK COVER

Models

MXZ-2A30VA -

MXZ-4A71VA -

MXZ-2A30VA -

MXZ-4A71VA -

MXZ-2A40VA -

MXZ-4A71VA -

MXZ-2A40VA -

MXZ-4A71VA -

MXZ-2A52VA -

MXZ-4A71VA -

MXZ-2A52VA -

MXZ-4A71VA -

MXZ-3A54VA -

MXZ-4A80VA -

MXZ-3A54VA -

MXZ-4A80VA -

MXZ-3A54VA -

MXZ-5A100VA -

MXZ-3A54VA -

MXZ-4A71VA -

No. OB377

REVISED EDITION-H

HFC

utilized

R410A

SPLIT-TYPE AIR CONDITIONERS

MXZ-4A80VA-E1

Please void OB377 REVISED EDITION-G.

OUTDOOR UNIT

Revision H:

• Indoor units combinations for 42 class

have been added.

•

MXZ-3A54VA-

and MXZ-4A71VA-

have been added.

NOTE:

• RoHS compliant products have <G> mark on the spec

name plate.

For servicing of RoHS compliant products, refer to the

RoHS Parts List.

Indoor unit service manual

MSZ-FA•VA Series (OB371)

MSZ-GA•VA Series (OB378, OB388)

MSZ-CB•VA Series (OB441)

MSZ-GC•VA Series (OBH468)

MSZ-GE•VA Series (OBH515)

MSZ-FD•VA Series (OBH488)

TECHNICAL CHANGES

MXZ-A26WV - E1 MXZ-3A54VA - E1

1. Indication of capacity has been changed. (BTU kW)

2. Capacity specification has been changed. (Cooling capacity 7.1kW 5.4kW)

3. Dimensions of unit have been changed. (W900 H900 D320 W840 H710 D330)

4. Combinations of connectable indoor units have been changed.

5. Capacity class of connectable indoor units has been changed.

6. Communication system has been changed.

7. Power supply way has been changed (change to supply to outdoor unit).

8. Compressor has been changed. (TNB220FMCH SNB130FLDH1)

9. High-pressure switch has been removed.

10.Outdoor fan motor has been changed. (PM8H60-UA RC0J60-AA)

11.Evaporation temperature thermistor has been removed.

12.Ambient temperature thermistor has been added.

13.New dip switch has been added to the controller board for "Locking the operation "mode

and "Lowering the operating noise "mode.

14.A Quick Clean Kit has been added.

MXZ-A32WV - E1 MXZ-4A71VA - E1

1. Indication of capacity has been changed. (BTU kW)

2. Capacity specification has been changed. (Cooling capacity 8.0kW 7.1kW)

3. Dimensions of unit have been changed. (W900 H900 D320 W840 H710 D330)

4. Combinations of connectable indoor units have been changed.

5. Capacity class of connectable indoor units has been changed.

6. Communication system has been changed.

7. Power supply way has been changed (change to supply to outdoor unit).

8. Compressor has been changed. (TNB220FMCH SNB130FLDH1)

9. High-pressure switch has been removed.

10. Outdoor fan motor has been changed. (PM8H60-UA RC0J60-AA)

11. Evaporation temperature thermistor has been removed.

12. Ambient temperature thermistor has been added.

13. New dip switch has been added to the controller board for "Locking the operation "mode

and "Lowering the operating noise "mode.

14. A Quick Clean Kit has been added.

Revision A :

• MXZ-3A54VA- E1 and MXZ-4A71VA- E2 have been added.

Quick clean kit has been removed. (Refer to 2.)

• MXZ-2A40VA- E1 and MXZ-2A52VA- E2 have been added.

Revision B :

• MXZ-2A30VA- E1 and MXZ-2A40VA- E2 have been added.

• “Check of HPS” has been corrected.

• RoHS PARTS LIST has been added.

Revision C :

• MXZ-2A52VA- E2 ,MXZ-3A54VA- E3 ,MXZ-4A71VA- E3 ,MXZ-4A80VA- E2 and MXZ-5A100VA- E1 have been added.

Revision D:

• MXZ-3A54VA- E4 ,and MXZ-4A71VA- E4 have been added.

• The content of pre-heat control (12-3) has been corrected.

• 5. SPECIFICATION has been corrected.

Revision E:

• MXZ-2A30VA- E1 has been added.

• 4. INDOOR UNITS COMBINATION of MXZ-5A100VA- E2 has been changed.

Revision F:

• MXZ-3A54VA- E5 and MXZ-4A71VA- E5 have been added.

Revision G:

• MXZ-3A54VA- E6 and MXZ-4A71VA- E6 have been added.

Revision H:

• Indoor units combinations for 42 class have been added.

•

MXZ-3A54VA-

and MXZ-4A71VA-

have been added.

MXZ-A32WV - E1 MXZ-4A80VA - E1

1. Indication of capacity has been changed. (BTU kW)

2. Communication system has been changed.

3. Power supply way has been changed (change to supply to outdoor unit).

4. Evaporation temperature thermistor has been removed.

5. Ambient temperature thermistor has been added.

6. New dip switch has been added to the controller board for "Locking the operation "mode

and "Lowering the operating noise "mode.

7. A Quick Clean Kit has been added.

MXZ-A14WV - E2 MXZ-2A40VA - E1

1. Indication of capacity has been changed. (BTU kW)

2. Dimensions of unit have been changed. (W840 H640 D330 W800 H550 D285)

3. Communication system has been changed.

4. Power supply way has been changed (change to supply to outdoor unit).

5. Compressor has been changed. (SNV092FJYH SNB130FKCH)

6. Outdoor fan motor has been changed. (RA6V49 RC0J50-CF)

7. Evaporation temperature thermistor has been removed.

8. Gas pipe temperature thermistor has been removed.

9. Ambient temperature thermistor has been added.

MXZ-A18WV - E2 MXZ-2A52VA - E1

1. Indication of capacity has been changed. (BTU kW)

2. Cooling capacity specification has been changed. (5.4 kW 5.2 kW)

3. Heating capacity specification has been changed. (6.6 kW 6.4 kW)

4. Dimensions of unit have been changed. (W840 H640 D330 W800 H550 D285)

5. Communication system has been changed.

6. Power supply way has been changed (change to supply to outdoor unit).

7. Compressor has been changed. (SNV092FJYH SNB130FKCH)

8. Outdoor fan motor has been changed. (RA6V49 RC0J50-CF)

9. Evaporation temperature thermistor has been removed.

10. Gas pipe temperature thermistor has been removed.

11. Ambient temperature thermistor has been added.

MXZ-3A54VA - E1 MXZ-3A54VA - E2

MXZ-4A71VA - E1 MXZ-4A71VA - E2

1. Quick clean kit has been removed.

MXZ-2A30VA - E1

1. New model

MXZ-2A40VA - E1 MXZ-2A40VA - E2

1. Compressor has been changed. (SNB130FKCH KNB092FEDH)

2. Outdoor heat exchanger has been changed.

MXZ-2A52VA - E1 MXZ-2A52VA - E2

1. Compressor has been changed. (SNB130FKCH SNB130FKMH)

2. Inverter P.C. board has been changed.

MXZ-3A54VA - E2 MXZ-3A54VA - E3

1. Compressor has been changed. (SNB130FLDH1 SNB130FLEH1)

2. Electronic control P.C. board has been changed.

MXZ-4A71VA - E2 MXZ-4A71VA - E3

1. Compressor has been changed. (SNB130FLDH1 SNB130FLEH1)

2. Electronic control P.C. board has been changed.

MXZ-4A80VA - E1 MXZ-4A80VA - E2

1. Ball valve has been changed to stop valve.

2. Gas pipe temperature thermistor has been removed.

3. Pre-heat control has been added.

4. Auto line correcting function has been added.

5. Noise filter P.C. board has been changed.

6. Electronic control P.C. board has been changed.

7. Weight has been changed. (70kg 67kg)

MXZ-5A100VA - E1

1. New model

MXZ-3A54VA - E3 MXZ-3A54VA - E4

1. Compressor has been changed. (SNB130FLEH1 SNB130FGBH1)

2. Electronic control P.C. board has been changed.

3. Gas pipe temperature thermistor has been removed.

4. Pre-heat control has been added.

5. Power board has been changed.

MXZ-4A71VA - E3 MXZ-4A71VA - E4

1. Compressor has been changed. (SNB130FLEH1 SNB130FGBH1)

2. Electronic control P.C. board has been changed.

3. Gas pipe temperature thermistor has been removed.

4. Pre-heat control has been added.

5. Power board has been changed.

MXZ-2A30VA - E1 MXZ-2A30VA - E2

1. Compressor has been changed. (KNB092FEDH KNB073FGDH)

2. Inverter P.C. board has been changed.

MXZ-3A54VA - E4 MXZ-3A54VA - E5

1. Electronic control P.C. board has been changed.

2. Noise filter P.C. board has been changed.

3. Ball valve has been changed to stop valve.

4. Sub panel has been added.

MXZ-4A71VA - E4 MXZ-4A71VA - E5

1. Electronic control P.C. board has been changed.

2. Noise filter P.C. board has been changed.

3. Ball valve has been changed to stop valve.

4. Sub panel has been added.

MXZ-3A54VA - E5 MXZ-3A54VA - E6

MXZ-4A71VA - E5 MXZ-4A71VA - E6

1. Electronic control P.C. board has been changed.

MXZ-3A54VA - E6 MXZ-3A54VA - E7

MXZ-4A71VA - E6 MXZ-4A71VA - E7

1. Electronic control P.C. board has been changed.

2. Compressor has been changed. (SNB130FGBH1 SNB130FGBH1T)

Refrigeration

oil Refrigerant

New refrigerant

R410A

HFC-32: HFC-125 (50%:50%)

Pseudo-azeotropic refrigerant

Not included

A1/A1

72.6

-51.4

1.557

Non combustible

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

86.5

-40.8

0.94

44.4

Non combustible

0.055

1700

Gas phase

Possible

Compatible oil

Light yellow

Non

Refrigerant

Composition (Ratio)

Refrigerant handling

Chlorine

Safety group (ASHRAE)

Molecular weight

Boiling point (°C)

Steam pressure [25°C](Mpa)

Saturated steam density [25°C](Kg/m3)

Combustibility

ODP 1

GWP 2

Refrigerant charge method

Additional charge on leakage

Kind

Color

Smell

1 :Ozone Depletion Potential : based on CFC-11

2 :Global Warming Potential : based on CO2

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

• This room air conditioner adopts 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 air conditioners.

As R410A has working pressure approximately 1.6 times as high as that of R22, some special tools and piping parts/

materials are required. Refer to the table below.

Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and

installation, since it is more susceptible to contaminations than R22.

For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant

piping.)

Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent

composition change.

-30 -20 -10 0 10 20 30 40 50 60

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

(MPa [Gauge])

R410A

R22

Conversion chart of refrigerant temperature and pressure

Saturated liquid pressure

(°C)

NOTE : The unit of pressure has been changed to MPa on the

international system of units (SI unit system).

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/cm2[Gauge])

R410A tools Can R22 tools be used?

Gas leak detector

R410A has high pressures beyond the measurement range of existing

gauges. Port diameters have been changed to prevent any other refrigerant

from being charged into the unit.

Hose material and cap size have been changed to improve the pressure

resistance.

Dedicated for HFC refrigerant.

6.35 mm and 9.52 mm

Description

Clamp bar hole has been enlarged to reinforce the spring strength in the tool.

Provided for flaring work (to be used with R22 flare tool).

Provided to prevent the back flow of oil. This adapter enables you to use

vacuum pumps.

It is difficult to measure R410Awith a charging cylinder because the

refrigerant bubbles due to high pressure and high-speed vaporization

Yes

New

Gauge manifold

Charge hose

Torque wrench

Flare tool

Flare gauge

Vacuum pump

adapter

Electronic scale for

refrigerant charging

No: Not Substitutable for R410A Yes: Substitutable for R410A

No 12.7 mm and 15.88 mm

1. Tools dedicated for the air conditioner with R410A refrigerant

The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.

The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant from

being charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.

NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system).

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/cm2[Gauge])

New Specification Current Specification

The incompatible refrigeration oil easily separates from

refrigerant and is in the upper layer inside the suction muffler.

Raising position of the oil back hole enables to back the

refrigeration oil of the upper layer to flow back to the

compressor.

Since refrigerant and refrigeration oil are compatible,

refrigeration oil goes back to the compressor through the

lower position oil back hole.

Compressor

Suction muffler

Oil back hole

Refrigeration oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigeration oil /Refrigerant

Compressor

Electronic scale for refrigerant charging

Outdoor unit

Refrigerant gas

cylinder

operating valve

Refrigerant gas cylinder

for R410A with siphon

Refrigerant (liquid)

Service port

Gauge manifold

valve (for R410A)

Union

Liquid pipe

Gas pipe

Stop valve

Indoor unit

Charge hose (for R410A)

R410A

Pipe diameter

6.35

9.52

12.7

15.88

Dimension of flare nut

R22

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”.

3. Refrigeration oil

Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

4. Air purge

• Do not discharge the refrigerant into the atmosphere.

Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant

circuit.

• Use the vacuum pump for air purging for the purpose of environmental protection.

5. Additional charge

For additional charging, charge the refrigerant from liquid phase of the gas cylinder.

If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the

outdoor unit. In this case, ability of the refrigeration cycle decreases or normal operation can be impossible. However,

charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.

2. Refrigerant piping

Specifications

Use the copper or copper-alloy seamless pipe for refrigerant that meet the following specifications.

Wall thickness

Outside diameter

6.35

9.52

12.7

15.88

0.8 mm

1.0 mm

Heat resisting foam plastic

Specific gravity 0.045 Thickness 8 mm

Insulation material

PART NAMES AND FUNCTIONS

MXZ-2A30VA

MXZ-2A40VA

MXZ-2A52VA

Air inlet

Air outlet

Drain outlet

Piping

Drain hose

(Back and side)

MXZ-3A54VA-E1 , E2 , E3 , E4

MXZ-4A71VA-E1 , E2 , E3 , E4

Air outlet

Drain outlet

Air inlet

(Back and side)

Air outlet

Drain outlet

Air inlet

(Back and side)

MXZ-3A54VA-E5 , E6 , E7

MXZ-4A71VA-E5 , E6 , E7

ACCESSORIES

Drain socket

Drain cap

Quick Clean kit

MXZ-2A30VA

MXZ-2A40VA

MXZ-2A52VA

MXZ-3A54VA - E1

MXZ-4A71VA - E1

MXZ-3A54VA - E2 , E3 , E4 , E5 , E6 , E7

MXZ-4A71VA - E2 , E3 , E4 , E5 , E6 , E7

MXZ-4A80VA

MXZ-5A100VA

MXZ-4A80VA- E1

Air outlet

Drain outlet

Air inlet

(Back and side)

MXZ-4A80VA- E2

MXZ-5A100VA

Air outlet

Drain outlet

Air inlet

(Back and side)

INDOOR/OUTDOOR CORRESPONDENCE TABLE

MXZ-2A40VA

MXZ-2A30VA

MXZ-2A52VA

MXZ-3A54VA

There is no combination other than this table.

MXZ-4A71VA MXZ-4A71VA

22+22

22+25

22+35

25+25

25+35

Indoor units combination

22+22

22+25

22+35

22+42

22+50

25+25

25+35

25+42

25+50

35+35

35+42

35+50

42+42

42+50

50+50

22+22+22

22+22+25

22+22+35

22+22+42

22+22+50

22+25+25

22+25+35

22+25+42

22+25+50

22+35+35

22+35+42

25+25+25

25+25+35

25+25+42

25+25+50

25+35+35

Indoor units combination

22+22

22+25

22+35

22+42

22+50

22+60

25+25

25+35

25+42

25+50

25+60

35+35

35+42

35+50

35+60

42+42

42+50

42+60

50+50

50+60

60+60

22+22+22

22+22+25

22+22+35

22+22+42

22+22+50

22+22+60

22+25+25

22+25+35

22+25+42

22+25+50

22+25+60

22+35+35

22+35+42

22+35+50

22+35+60

22+42+42

22+42+50

22+42+60

22+50+50

25+25+25

25+25+35

25+25+42

25+25+50

25+25+60

25+35+35

25+35+42

25+35+50

25+35+60

25+42+42

25+42+50

25+50+50

35+35+35

35+35+42

Indoor units

combination

22+22

22+25

25+25

22+22

22+25

22+35

25+25

25+35

35+35

Indoor units

combination

Indoor units

combination

Indoor units combination

35+35+50

35+42+42

22+22+22+22

22+22+22+25

22+22+22+35

22+22+22+42

22+22+22+50

22+22+25+25

22+22+25+35

22+22+25+42

22+22+25+50

22+22+35+35

22+22+35+42

22+25+25+25

22+25+25+35

22+25+25+42

22+25+25+50

22+25+35+35

22+25+35+42

25+25+25+25

25+25+25+35

25+25+25+42

25+25+25+50

25+25+35+35

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