Mitsubishi Electric MXZ-2A30VA - E1 User manual

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 -
E1
MXZ-4A71VA -
E2
MXZ-2A30VA -
E2
MXZ-4A71VA -
E3
MXZ-2A40VA -
E1
MXZ-4A71VA -
E4
MXZ-2A40VA -
E2
MXZ-4A71VA -
E5
MXZ-2A52VA -
E1
MXZ-4A71VA -
E6
MXZ-2A52VA -
E2
MXZ-4A71VA -
E7
MXZ-3A54VA -
E1
MXZ-4A80VA -
E1
MXZ-3A54VA -
E2
MXZ-4A80VA -
E2
MXZ-3A54VA -
E3
MXZ-5A100VA -
E1
MXZ-3A54VA -
E4
MXZ-3A54VA -
E5
MXZ-3A54VA -
E6
MXZ-3A54VA -
E7
MXZ-4A71VA -
E1
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-
E7
and MXZ-4A71VA-
E7
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
2
1
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-
E7
and MXZ-4A71VA-
E7
have been added.

3
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.

4
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)

5
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
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
Non
Non
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
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.

6
-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
No
No
No
Yes
Yes
New
New
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

7
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
mm
6.35
9.52
12.7
15.88
17
22
26
29
Dimension of flare nut
R22
17
22
24
27
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
mm
6.35
9.52
12.7
15.88
0.8 mm
0.8 mm
0.8 mm
1.0 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material

8
PART NAMES AND FUNCTIONS
2
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

9
ACCESSORIES
Drain socket
Drain cap
Quick Clean kit
1
-
-
1
2
1
1
2
-
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)

10
INDOOR/OUTDOOR CORRESPONDENCE TABLE
3
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