Mitsubishi MUX-2A28VB User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. INDOOR / OUTDOOR
CORRESPONDENCE TABLE ···························6
4. SPECIFICATION·················································7
5. NOISE CRITERIA CURVES·····························12
6. OUTLINES AND DIMENSIONS ······················ 13
7. WIRING DIAGRAM ··········································16
8. REFRIGERANT SYSTEM DIAGRAM··············21
9. PERFORMANCE CURVES······························32
10. ACTUATOR CONTROL····································55
11. TROUBLESHOOTING······································56
12. DISASSEMBLY INSTRUCTIONS·····················63
13. PARTS LIST······················································68
Multi system type
Models
MUX-2A28VB -
MUX-2A59VB -
MUX-3A60VB -
MUX-3A63VB -
MUX-2A70VB -
MUX-4A73VB - E1
E1
E1
E1
E1
E1
MUX-2A59VB -
MUX-3A60VB -
MUX-3A63VB -
MUX-2A70VB - E1
E1
E1
E1
HFC
utilized
R410A
SPLIT-TYPE, AIR CONDITIONER
Indication of
model name
NOTE:
•As for indoor unit MSC-CA20VB - , MSC-CA25VB -
or MSC-CA35VB - , refer to the service manual OB393.
•This manual describes technical data of outdoor unit.
•As for indoor unit MSC-GA20VB - , MSC-GA25VB -
or MSC-GA35VB - , refer to the service manual OB385.
E1
E1E1
E1
E1E1
No. OB384
OB384--1.qxp 05.1.17 13:08 Page 1

TECHNICAL CHANGES
2
1
MUX-A10WV- ➔MUX-2A28VB-
MUX-A20WV- ➔MUX-3A60VB-
1. Indication of capacity has been changed. (BTU➔kW)
MUX-A19WV- ➔MUX-2A59VB-
MUX-A22WV- ➔MUX-3A63VB-
MUX-A25WV- ➔MUX-2A70VB-
MUX-A26WV- ➔MUX-4A73VB-
1. Indication of capacity has been changed. (BTU➔kW)
2. Size of stop valve (Gas) has been changed. ([12.7➔[9.52)
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
OB384--1.qxp 05.1.17 13:08 Page 2

3
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 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 refrigeration 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
OB384--1.qxp 05.1.17 13:08 Page 3

4
-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
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 refrigerant pipes that meet the following specifications.
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less
than 0.8mm, as the pressure resistance is insufficient.
Wall
thickness
Outside diameter
Pipe mm
For liquid
For gas 6.35
9.52 0.8 mm
0.8 mm Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material
OB384--1.qxp 05.1.17 13:08 Page 4

5
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 17
22
Dimension of flare nut
R22
17
22
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.
OB384--1.qxp 05.1.17 13:08 Page 5

PART NAMES AND FUNCTIONS
6
2
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
OUTDOOR UNIT
MUX-2A28VB- E1
Air inlet
Piping
Drainage hose
(Back and side)
Air outlet
Drain outlet
MUX-4A73VB- E1
Air outlet
Drain outlet
Air inlet
Piping
Drainage hose
(Back and side)
MUX-2A59VB- MUX-3A63VB-
MUX-3A60VB- MUX-2A70VB- E1E1
E1E1
Combination of
the connectable
indoor units
A:
MSC-CA35VB- E1
or
MSC-GA35VB- E1
B: MSC-CA20VB- E1
or
MSC-GA20VB- E1
A: MSC-CA25VB - E1
B: or
C: MSC-GA25VB - E1
A:
B:
A:
B:
A: MSC-CA35V B- E1
or
MSC-GA35VB - E1
B: MSC-CA20VB - E1
or
C: MSC-GA20VB - E1
MUX-2A59VB- E1
MUX-3A63VB- E1
MUX-3A60VB- E1 MUX-2A28VB- E1
MUX-2A70VB- E1
MUX-4A73VB- E1
A: MSC-CA35VB - E1
or
B: MSC-GA35VB - E1
C: MSC-CA25VB - E1
or
D: MSC-GA25VB - E1
MSC-CA35VB - E1
or
MSC-GA35VB - E1
MSC-CA20VB- E1
or
MSC-GA20VB - E1
OUTDOOR UNIT
MUX-2A28VB - MUX-2A59VB - MUX-3A60VB - MUX-3A63VB -
MUX-2A70VB - MUX-4A73VB - E1E1
E1E1E1E1
INDOOR / OUTDOOR CORRESPONDENCE TABLE3
OB384--1.qxp 05.1.17 13:08 Page 6

SPECIFICATION
7
4
Outdoor model
Function
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance (at 20:)
Model
Winding
resistance (at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
kW
R/h
K/h
A
A
W
A(kW)
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
MUX-2A28VB - E1
Cooling
Single phase
230V,50Hz
1,914
10
—
21
0.29
RN092VHSHT
600
C-R 3.87
C-S 6.14
RA6V33-FC
WHT-BLK 223
BLK-RED 221
780O540O255
35
49
825
1
0.90 (Room A+B)
350 (NEO22)
Single
A or B
2.4
0.9
3.20
725
98.5
2.91
3.16
Single
A
3.5
1.4
5.73
1,280
97.1
5.16
2.65
Double
A+B
3.5+2.4
1.4+0.9
8.96
2,005
97.3
8.39
2.84
Double
A+B
1.4O2
0.2O2
3.25
730
97.7
2.96
3.50
MUX-2A59VB - E1
Cooling
Single phase
230V,50Hz
Compressor Electrical
data
Fan motor
Special remarks
Capacity
Coefficient of performance (C.O.P)
Outdoor unit power supply
Indoor unit No. Single
B
2.4
0.9
2,460
20
3.51
785
—
97.2
48
2.94
0.57
2.93
MC1 : RN145VHSHT, MC2 : RN092VHSHT
MC1 : 1,000, MC2 : 600
RA6V60-GA
WHT-BLK 90
BLK-RED 146
840O640O330
66
52
730
1
1.00 (Room A)
0.80 (Room B)
MC1 : 620 (NEO22), MC2 : 350 (NEO22)
C-R 2.43
C-S 3.80
MC1 : , MC2 : C-R 3.87
C-S 6.14
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length : 5m
NOTE: As for specification of the indoor units, refer to service manual OB393 (MSC-CA20/25/35VA- ) or
OB385 (MSC-GA20/25/35VA- ).
E1
E1
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8
Outdoor model
Function
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance (at 20:)
Model
Winding
resistance (at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
kW
R/h
K/h
A
A
W
A(kW)
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
Single phase
230V,50Hz
Double
A+B or A+C
2.6+2.8
0.9+1.1
2,460
20
8.18
1,850
—
98.3
47
7.61
0.57
2.81
MC1 : RN099VHSHT, MC2 : RN125VHSHT
MC1 : 650, MC2 : 800
RA6V60-GA
WHT-BLK 90
BLK-RED 146
840O640O330
65
52
730
1
0.80 (Room A)
1.00 (Room B+C)
MC1 : 350 (NEO22), MC2 : 350 (NEO22)
MUX-3A60VB - E1
Cooling
Compressor Electrical
data
Fan motor
Special remarks
Capacity
Coefficient of performance (C.O.P)
Outdoor unit power supply
Indoor unit No. Single
A
2.6
0.9
3.64
815
97.3
3.07
3.06
Single
B or C
2.9
1.2
4.86
1,075
96.2
4.29
2.61
Double
B+C
1.75O2
0.3O2
4.86
1,090
97.5
4.29
3.02
Triple
A+B+C
2.5+1.75O2
0.8+0.3O2
8.41
1,885
97.5
7.84
3.02
C-R 3.40
C-S 4.56
MC1 : , MC2 : C-R 2.86
C-S 5.72
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length : 5m
NOTE: As for specification of the indoor units, refer to service manual OB393 (MSC-CA20/25/35VA- ) or
OB385 (MSC-GA20/25/35VA- ).
E1
E1
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9
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance (at 20:)
Model
Winding
resistance (at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
kW
R/h
K/h
A
A
W
A(kW)
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
Cooling
Single phase
230V,50Hz
Double
A+B or A+C
3.5+2.4
1.4+0.9
2,460
20
8.92
1,975
—
96.3
48
8.01
0.57
2.88
MC1 : RN145VHSHT, MC2 : RN092VHSHT
MC1 : 1,000, MC2 : 600
RA6V60-GA
WHT-BLK 90
BLK-RED 146
840O640O330
67
52
730
1
0.85 (Room A)
0.85 (Room B+C)
MC1 : 620 (NEO22), MC2 : 350 (NEO22)
MUX-3A63VB - E1
Compressor Electrical
data
Fan motor
Special remarks
Capacity
Coefficient of performance (C.O.P)
Outdoor unit power supply
Indoor unit No. Single
A
3.5
1.4
5.73
1,280
97.1
5.02
2.65
Single
B or C
2.4
0.9
3.64
815
97.3
2.99
2.82
Double
B+C
1.45O2
0.4
3.69
830
97.8
2.99
3.22
Triple
A+B+C
3.4+1.45O2
1.4+0.4
8.84
1,980
97.4
8.01
3.01
C-R 2.43
C-S 3.80
MC1 : , MC2 : C-R 3.87
C-S 0.14
Outdoor model
Function
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length 5m
NOTE: As for specification of the indoor units, refer to service manual OB393 (MSC-CA20/25/35VA- ) or
OB385 (MSC-GA20/25/35VA- ).
E1
E1
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10
Outdoor model
Function
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance (at 20:)
Model
Winding
resistance (at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
kW
R/h
K/h
A
A
W
A(kW)
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
Compressor Electrical
data
Fan motor
Special remarks
Capacity
Coefficient of performance (C.O.P)
Outdoor unit power supply
Indoor unit No.
MUX-2A70VB - E1
Cooling
Single phase 230V,50Hz
2,460
20
—
54
0.57
MC1 : RN145VHSHT, MC2 : RN145VHSHT
MC1 : 1,000, MC2 : 1,000
RA6V60-GA
WHT-BLK 90
BLK-RED 146
840O640O330
68
52
730
1
0.95 (Room A)
0.95 (Room B)
MC1 : 620 (NEO22), MC2 : 620 (NEO22)
Single
A or B
3.5
1.4
5.88
1,300
96.1
5.31
2.61
Double
A+B
3.5O2
1.4O2
11.49
2,540
96.1
10.92
2.67
C-R 2.43
C-S 3.80
MC1 : , MC2 : C-R 2.43
C-S 3.80
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length : 5m
NOTE: As for specification of the indoor units, refer to service manual OB393 (MSC-CA20/25/35VA- ) or
OB385 (MSC-GA20/25/35VA- ).
E1
E1
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