Mitsubishi Electric MXZ-2A40VA User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················7
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························8
4. INDOOR UNITS COMBINATION·····················10
5. SPECIFICATION···············································24
6. NOISE CRITERIA CURVES·····························27
7. OUTLINES AND DIMENSIONS ·······················28
8. WIRING DIAGRAM ··········································31
9. REFRIGERANT SYSTEM DIAGRAM··············35
10. PERFORMANCE CURVES······························39
11. ACTUATOR CONTROL····································50
12. SERVICE FUNCTIONS·····································50
13. TROUBLESHOOTING······································53
14. DISASSEMBLY INSTRUCTIONS·····················77
15. PARTS LIST······················································86
16. OPTIONAL PARTS ······················BACK COVER
Inverter-controlled multi system type
Models
MXZ-2A40VA -
MXZ-2A52VA -
MXZ-3A54VA -
MXZ-3A54VA -
MXZ-4A71VA -
MXZ-4A71VA -
MXZ-4A80VA - E1
E2
E1
E2
E1
E1
E1
No. OB377
REVISED EDITION-A
HFC
utilized
R410A
SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS
MXZ-4A80VA
NOTE:
•This service manual describes technical data of outdoor units.
Indoor unit service manual
MSZ-FA•VA Series (OB371)
MSZ-GA•VA Series
(OB378,OB388)
MSZ-CB•VA Series (OB441)
Please void OB377
OUTDOOR UNIT
Revision : A
• MXZ-3A54/4A71VA-has been added.
• MXZ-2A40/2A52VA-has been added.
E1
E2
OB377--1.qxp 05.12.14 3:17 PM Page 1

TECHNICAL CHANGES
2
1
MXZ-A26WV - ➔MXZ-3A54VA -
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 has been changed. (W900oH900oD320➔W840oH710oD330)
4. Combinations of connectable indoor units have been changed.
5. Capacity class of connectable indoor units have 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 - ➔MXZ-4A71VA -
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 has been changed. (W900oH900oD320➔W840oH710oD330)
4. Combinations of connectable indoor units have been changed.
5. Capacity class of connectable indoor units have 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-U➔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 - ➔MXZ-4A80VA -
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.
E1E1
E1E1
E1E1
• MXZ-3A54/4A71VA- has been added.
Quick clean kit has been removed.(Refer to 2)
• MXZ-2A40/52VA- has been added.
E1
E2
Revision : A
OB377--1.qxp 05.12.14 3:17 PM Page 2

3
MXZ-A14WV - ➔MXZ-2A40VA -
1. Indication of capacity has been changed. (BTU➔kW)
2. Dimensions of unit has been changed. (W840oH640oD330➔W800oH550oD285)
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. Pas pipe temperature thermistor has been removed.
9. Ambient temperature thermistor has been added.
MXZ-A18WV - ➔MXZ-2A52VA -
1. Indication of capacity has been changed. (BTU➔kW)
2. Cooling capacity specification has been changed. (5.4kW➔5.2kW)
3. Heating capacity specification has been changed. (6.6kW➔6.4kW)
4. Dimensions of unit has been changed. (W840oH640oD330➔W800oH550oD285)
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.Pas pipe temperature thermistor has been removed.
11. Ambient temperature thermistor has been added.
MXZ-3A54VA - ➔MXZ-3A54VA -
MXZ-4A71VA - ➔MXZ-4A71VA -
1. Quick clean kit has been removed.
E2E1
E2E1
E1E2
E1E2
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4
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 (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : 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.
1As 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.
2Take 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.
3For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
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/ff[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 refrigerantion oil are compatible each,
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
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5
-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
(:)
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/ff[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 being
charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
2.Refrigerant piping
1Specifications
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
OB377--1.qxp 05.12.14 3:17 PM Page 5

6
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
2Flaring 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.Refrigerant 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.
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7
PART NAMES AND FUNCTIONS
2
ACCESSORIES
MXZ-2A40VA
MXZ-2A52VA
Drain socket
Drain cap
Quick Clean kit
1
−
−
1
2
1
1
2
−
1
2
3
MXZ-2A40VA
MXZ-2A52VA MXZ-3A54VA - E1
MXZ-4A71VA - E1
MXZ-3A54VA - E2
MXZ-4A71VA - E2
MXZ-4A80VA
MXZ-4A80VA
Air outlet
Drain outlet
Air inlet
(Back and side)
Air inlet
Air outlet
Drain outlet
Piping
Drain hose
(back and side)
MXZ-3A54VA
MXZ-4A71VA
Air outlet
Drain outlet
Air inlet
(Back and side)
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8
INDOOR/ OUTDOOR CORRESPONDENCE TABLE
3
MXZ-2A40VA
MXZ-2A52VA
MXZ-3A54VA
❈There is no combination other than this table.
MXZ-4A71VA
22+22
22+25
22+35
25+25
25+35
Combination of the connectable indoor units
22+22
22+25
22+35
22+50
25+25
25+35
25+50
35+35
35+50
50+50
22+22+22
22+22+25
22+22+35
22+22+50
22+25+25
22+25+35
22+25+50
22+35+35
25+25+25
25+25+35
25+25+50
25+35+35
Combination of the connectable indoor units
22+22
22+25
22+35
22+50
22+60
25+25
25+35
25+50
25+60
35+35
35+50
35+60
50+50
50+60
60+60
22+22+22
22+22+25
22+22+35
22+22+50
22+22+60
22+25+25
22+25+35
22+25+50
22+25+60
22+35+35
22+35+50
22+35+60
22+50+50
25+25+25
25+25+35
25+25+50
25+25+60
25+35+35
25+35+50
25+35+60
25+50+50
35+35+35
35+35+50
22+22+22+22
22+22+22+25
22+22+22+35
22+22+22+50
22+22+25+25
22+22+25+35
22+22+25+50
22+22+35+35
22+25+25+25
22+25+25+35
22+25+25+50
25+25+35+35
22+25+35+35
25+25+25+25
25+25+25+35
25+25+25+50
Combination of the
connectable indoor
units
22+22
22+25
22+35
25+25
25+35
35+35
Combination of the
connectable indoor
units
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9
❈There is no combination other than this table.
MXZ-4A80VA MXZ-4A80VA
Combination of the connectable indoor units
22+22
22+25
22+35
22+50
22+60
22+71
25+25
25+35
25+50
25+60
25+71
35+35
35+50
35+60
35+71
50+50
50+60
50+71
60+60
60+71
22+22+22
22+22+25
22+22+35
22+22+50
22+22+60
22+22+71
22+25+25
22+25+35
22+25+50
22+25+60
22+25+71
22+35+35
22+35+50
22+35+60
22+35+71
22+50+50
22+50+60
22+50+71
25+25+25
25+25+35
25+25+50
25+25+60
25+25+71
25+35+35
25+35+50
25+35+60
25+35+71
25+50+50
Combination of the connectable indoor units
25+50+60
35+35+35
35+35+50
35+35+60
35+35+71
35+50+50
35+50+60
22+22+22+22
22+22+22+25
22+22+22+35
22+22+22+50
22+22+22+60
22+22+22+71
22+22+25+25
22+22+25+35
22+22+25+50
22+22+25+60
22+22+25+71
22+22+35+35
22+22+35+50
22+22+35+60
22+22+50+50
22+25+25+25
22+25+25+35
22+25+25+50
22+25+25+60
22+25+35+35
22+25+35+50
22+25+35+60
22+35+35+35
22+35+35+50
25+25+25+25
25+25+25+35
25+25+25+50
25+25+25+60
25+25+35+35
25+25+35+50
25+35+35+35
35+35+35+35
OB377--1.qxp 05.12.14 3:17 PM Page 9

10
22
25
35
22+22
22+25
22+35
25+25
25+35
Indoor units
combination Unit A Unit B
Cooling capacity (kW) Total Outdoor unit
power consumption
(kW) Current
(A) Power
factor
(%)
NOTE: Electrical data is for outdoor unit only.
MXZ-2A40VA
90
90
90
95
95
95
95
95
2.08
2.37
3.53
3.80
4.44
4.44
4.44
4.78
2.2
(0.9 - 3.0)
2.5
(0.9 - 3.3)
3.5
(0.9 - 4.0)
3.8
( 1.1 - 4.3)
3.9
(1.1 - 4.3)
3.9
(1.1 - 4.4)
3.9
(1.1 - 4.4)
4.0
(1.1 - 4.5)
0.430
(0.120 - 0.620)
0.490
(0.120 - 0.690)
0.730
(0.120 - 0.900)
0.830
(0.250 - 1.110)
0.970
(0.250 - 1.110)
0.970
(0.250 - 1.130)
0.970
(0.250 - 1.130)
1.045
(0.250 - 1.170)
1.90
2.07
2.39
1.95
2.33
2.20
2.50
3.50
1.90
1.83
1.51
1.95
1.67
INDOOR UNITS COMBINATION4
22
25
35
22+22
22+25
22+35
25+25
25+35
Indoor units
combination Unit A Unit B
Heating capacity (kW) Total Outdoor unit
power consumption
(kW) Current
(A) Power
factor
(%)
NOTE: Electrical data is for outdoor unit only.
90
90
90
95
95
95
95
95
3.24
3.53
4.20
4.16
4.16
4.16
4.16
4.32
3.3
(0.9 - 4.0)
3.6
(0.9 - 4.5)
4.0
(0.9 - 4.8)
4.4
(1.0 - 4.8)
4.4
(1.0 - 4.8)
4.4
(1.0 - 4.9)
4.4
(1.0 - 4.9)
4.5
(1.0 - 5.0)
0.670
(0.110 - 0.910)
0.730
(0.110 - 1.050)
0.870
(0.110 - 1.150)
0.910
(0.200 - 1.010)
0.910
( 0.200 - 1.010)
0.910
(0.200 - 1.030)
0.910
(0.200 - 1.030)
0.945
(0.200 - 1.050)
2.20
2.34
2.70
2.20
2.65
3.30
3.60
4.00
2.20
2.06
1.70
2.20
1.85
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