SPLIT-TYPE, AIR CONDITIONERS
No. OB330
HFC
utilized
SERVICE MANUAL R410A
Wireless type
Models
MU-A07YV - E1
MU-A09YV - E1
MU-A12YV - E1
Indication of model name
MU-A07YV - MU-A09YV - MU-A12YV -
E1
E1
E1
CONTENTS
1.TECHNICAL CHANGES ················
2.PART NAMES AND FUNCTIONS············
3.SPECIFICATION····················
4.NOISE CRITERIA CURVES ···············
5.OUTLINES AND DIMENSIONS ·············
6.WIRING DIAGRAM ··················
7.REFRIGERANT SYSTEM DIAGRAM ···········
8.PERFORMANCE CURVES ···············
9.TROUBLESHOOTING·················
10.DISASSEMBLY INSTRUCTIONS·············
11.PARTS LIST······················
NOTE:
•This manual describes technical data of outdoor units.
•As for indoor units MSC-A07/A09/A12YV - E1 , refer to the service manual OB329.
1 
TECHNICAL CHANGES
MU-A07WV- E1 MU-A07YV- E1
MU-A09WV- E1 MU-A09YV- E1
1.Outdoor heat exchanger has changed.
2.Outdoor fan motor has changed. (RA6V23-FC RC6V20-AC)
MU-A12WV- E1 MU-A12YV- E1
1.Outdoor heat exchanger has changed.
2.Outdoor fan motor has changed. (RA6V33-DC RA6V33-FC)
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.
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.
Refrigerant
Refrigerating |
oil |
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New refrigerant |
Previous refrigerant |
Refrigerant |
R410A |
R22 |
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Composition (Ratio) |
HFC-32: HFC-125 (50%:50%) |
R22 (100%) |
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Refrigerant handling |
Pseudo-azeotropic refrigerant |
Single refrigerant |
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Chlorine |
Not included |
Included |
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Safety group (ASHRAE) |
A1/A1 |
A1 |
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Molecular weight |
72.6 |
86.5 |
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Boiling point (:) |
-51.4 |
-40.8 |
Steam pressure [25:](Mpa) |
1.557 |
0.94 |
Saturated steam density [25:](Kg/K) |
64 |
44.4 |
Combustibility |
Non combustible |
Non combustible |
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ODP w1 |
0 |
0.055 |
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GWP w2 |
1730 |
1700 |
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Refrigerant charge method |
From liquid phase in cylinder |
Gas phase |
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Additional charge on leakage |
Possible |
Possible |
Kind |
Incompatible oil |
Compatible oil |
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Color |
Non |
Light yellow |
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Smell |
Non |
Non |
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w1 :Ozone Destruction Parameter |
: based on CFC-11 |
w2 :Global Warmth Parameter |
: based on CO2 |
Compressor
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New Specification |
Current Specification |
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The incompatible refrigerating oil easily separates from |
Since refrigerant and refrigerating oil are compatible each, |
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refrigerant and is in the upper layer inside the suction muffler. |
refrigerating oil backs to the compressor through the lower |
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Raising position of the oil back hole enables to back the |
position oil back hole. |
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refrigerating oil of the upper layer to flow back to the |
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compressor. |
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Suction muffler |
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Suction muffler |
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Oil back hole |
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Compressor |
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Compressor |
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Refrigerating oil |
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Oil back hole |
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Refrigerating oil /Refrigerant
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/f [Gauge])
2
Conversion chart of refrigerant temperature and pressure
(MPa [Gauge]) |
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4.0 |
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3.5 |
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pressure |
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R410A |
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3.0 |
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R22 |
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liquid |
2.5 |
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2.0 |
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1.5 |
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Saturated |
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1.0 |
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0.5 |
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0.0 |
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-0.5 |
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-30 -20 |
-10 0 10 20 30 40 50 60 |
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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/f [Gauge])
(:)
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.
R410A tools |
Can R22 tools be used? |
Description |
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R410A has high pressures beyond the measurement range of existing |
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Gauge manifold |
No |
gauges. Port diameters have been changed to prevent any other refrigerant |
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from being charged into the unit. |
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Charge hose |
No |
Hose material and cap size have been changed to improve the pressure |
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resistance. |
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Gas leak detector |
No |
Dedicated for HFC refrigerant. |
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Torque wrench |
Yes |
6.35 mm and 9.52 mm |
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No |
12.7 mm |
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Flare tool |
Yes |
Clamp bar hole has been enlarged to reinforce the spring strength in the tool. |
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Flare gauge |
New |
Provided for flaring work (to be used with R22 flare tool). |
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Vacuum pump |
New |
Provided to prevent the back flow of oil. This adapter enables you to use |
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adapter |
vacuum pumps. |
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Electronic scale for |
New |
It is difficult to measure R410A with a charging cylinder because the |
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refrigerant charging |
refrigerant bubbles due to high pressure and high-speed vaporization |
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No : Not Substitutable for R410A Yes : Substitutable for R410A
2.Refrigerant piping
1Specifications
Use the refrigerant pipes that meet the following specifications.
Pipe |
Outside diameter |
Wall |
Insulation material |
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mm |
thickness |
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For liquid |
6.35 |
0.8 mm |
Heat resisting foam plastic |
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For gas |
9.52 |
0.8 mm |
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Specific gravity 0.045 Thickness 8 mm |
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12.70.8 mm
•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.
3
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”.
Pipe diameter |
Dimension of flare nut |
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mm |
R410A |
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R22 |
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6.35 |
17 |
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17 |
9.52 |
22 |
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22 |
12.7 |
26 |
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24 |
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 refrigerating 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.
Indoor unit
Refrigerant gas cylinder operating valve
Union
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Stop valve |
Liquid pipe |
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Gas pipe |
Outdoor unit |
Service port
Gauge manifold valve (for R410A)
Charge hose (for R410A)
Refrigerant gas cylinder for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
4
2 
PART NAMES AND FUNCTIONS
OUTDOOR UNIT
MU-A07YV - E1 MU-A09YV - E1 MU-A12YV - E1
Air inlet (back and side)
Piping
Drain hose
Air outlet
Drain outlet
3 SPECIFICATION
Outdoor model
Outdoor unit power supply
Capacity |
Outdoor air flow |
K /h |
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Capacity |
kW |
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Dehumidification |
R/h |
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Power outlet |
A |
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Running current |
A |
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Electrical |
data |
Power input |
W |
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Auxiliary heater |
A(kW) |
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Power factor |
% |
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Starting current |
A |
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Compressor motor current |
A |
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Fan motor current |
A |
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Coefficient of performance(C.O.P) |
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Compressor |
Model |
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resistance(at 20:) |
W |
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Output |
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Winding |
" |
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Fan |
motor |
Model |
" |
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Winding |
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resistance(at 20:) |
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Dimensions WOHOD |
mm |
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Weight |
kg |
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Sound level |
dB |
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Special |
remarks |
Fan speed |
rpm |
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Fan speed regulator |
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Refrigerant filling |
kg |
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capacity (R410A) |
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Refrigerating oil (Model) |
cc |
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MU-A07YV - E1 |
MU-A09YV - E1 |
MU-A12YV - E1 |
Single phase |
Single phase |
Single phase |
230V,50Hz |
230V,50Hz |
230V,50Hz |
2.3 |
2.55 |
3.5 |
0.9 |
1.1 |
1.7 |
1,686 |
1,686 |
1,914 |
10 |
10 |
10 |
3.00 |
3.32 |
4.92 |
680 |
760 |
1,100 |
– |
– |
– |
98 |
99 |
97 |
23 |
24 |
29 |
2.78 |
3.10 |
4.61 |
0.22 |
0.22 |
0.31 |
3.22 |
3.21 |
3.07 |
RN092VHSHT |
RN099VHSHT |
RN135VHSHT |
600 |
700 |
900 |
C-R 3.87 |
C-R 3.40 |
C-R 2.79 |
C-S 6.14 |
C-S 4.56 |
C-S 3.36 |
RC6V20-AC |
RC6V20-AC |
RA6V33-FC |
WHT-BLK 410 |
WHT-BLK 410 |
WHT-BLK 223 |
BLK-RED 433 |
BLK-RED 433 |
BLK-RED 228 |
780o540o255 |
780o540o255 |
780o540o255 |
34 |
34 |
36 |
45 |
45 |
49 |
735 |
735 |
825 |
1 |
1 |
1 |
0.60 |
0.60 |
0.75 |
350 (NEO22 ) |
350 (NEO22 ) |
620 (NEO22) |
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length 5m
5
4 NOISE CRITERIA CURVES
MU-A07YV- |
E1 |
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FUNCTION |
SPL(dB(A)) |
LINE |
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MU-A09YV- |
E1 |
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COOL |
45 |
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Test conditions, |
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90 |
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Cooling : DB27: |
WB19: |
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MICRO BAR |
80 |
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70 |
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dB re 0.0002 |
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NC-70 |
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60 |
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LEVEL, |
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NC-60 |
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PRESSURE |
50 |
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NC-50 |
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BAND SOUND |
40 |
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NC-40 |
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30 |
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OCTAVE |
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NC-30 |
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20 |
APPROXIMATE |
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TERESHOLD OF |
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HEARING FOR |
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NC-20 |
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CONTINUOUS |
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NOISE |
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10 |
63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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BAND CENTER FREQUENCIES, Hz
MU-A12YV- E1 |
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FUNCTION |
SPL(dB(A)) |
LINE |
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COOL |
49 |
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Test conditions, |
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90 |
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Cooling :DB35: |
WB24: |
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MICRO BAR |
80 |
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70 |
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dB re 0.0002 |
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NC-70 |
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60 |
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LEVEL, |
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NC-60 |
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PRESSURE |
50 |
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NC-50 |
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BAND SOUND |
40 |
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NC-40 |
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30 |
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OCTAVE |
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NC-30 |
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20 |
APPROXIMATE |
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TERESHOLD OF |
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HEARING FOR |
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NC-20 |
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CONTINUOUS |
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NOISE |
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10 |
63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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BAND CENTER FREQUENCIES, Hz
OUTDOORUNIT
1m
MICROPHONE
6
5 
OUTLINES AND DIMENSIONS
MU-A07YV - E1 MU-A09YV - E1
OUTDOOR UNIT
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Air in |
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320 |
32 |
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109 |
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Air in |
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Drainage |
147 110 |
3holes [33 |
Air out |
540
260 |
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10 |
40 |
122 |
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500
780
MU-A12YV - E1 |
REQUIRED SPACE |
moreor |
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Unit: mm |
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100mm |
or |
more |
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100mm |
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100mm |
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or |
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more |
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255 285 320 |
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or |
more |
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400mm |
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350mm |
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25 |
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or |
more |
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Service panel |
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Liquid refrigerant |
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pipe joint |
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Refrigerant pipe |
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- |
(flared) [6.35 |
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35 |
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- |
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155 |
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43 |
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90 |
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Gas refrigerant |
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pipe joint |
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74 |
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104 |
Refrigerant pipe |
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(flared) [9.52 (MU-A07/A09YV) |
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[12.7 (MU-A12YV)
6 
WIRING DIAGRAM
MU-A07YV - E1 MU-A09YV - E1 MU-A12YV - E1 |
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OUTDOOR UNIT |
MODELS WIRING DIAGRAM |
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TB2 |
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TO |
2 |
WHT |
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INDOOR UNIT |
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52C |
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CONNECTING |
1 |
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12V |
BLK |
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BRN DSAR
CIRCUIT BREAKER |
TB1 |
52C |
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L |
BRN |
WHT |
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NO |
COM |
POWER SUPPLY |
N |
BLU |
WHT |
~/N |
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230V 50Hz |
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PE |
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C2 |
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GRN/YLW |
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C1 RED
S
BLK
WHT 1 WHT BLU 2 BLK RED 3 RED
C
MC
R
MF
SYMBOL |
NAME |
SYMBOL |
NAME |
SYMBOL |
NAME |
C1 |
COMPRESSOR CAPACITOR |
MC |
COMPRESSOR(INNER PROTECTOR) |
TB1,TB2 |
TERMINAL BLOCK |
C2 |
OUTDOOR FAN CAPACITOR |
MF |
OUTDOOR FAN MOTOR |
52C |
COMPRESSOR CONTACTOR |
DSAR |
SURGE ABSORBER |
(INNER FUSE/INNER PROTECTOR) |
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NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring)
3.Symbols below indicate.
/: Terminal block, 
: Connector
7
7 
REFRIGERANT SYSTEM DIAGRAM
MU-A07YV - E1 |
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Unit:mm |
MU-A09YV - E1 |
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OUTDOOR UNIT |
Refrigerant pipe [9.52 |
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(with heat insulator) |
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Stop valve |
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(with service port) |
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Muffler |
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Outdoor |
Flared connection |
heat |
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exchanger |
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Compressor |
Flared connection |
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Strainer |
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#100 |
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Capillary tube |
Refrigerant pipe [6.35 |
[3.0x[1.4x900 |
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(with heat insulator) |
Refrigerant flow in cooling |
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MU-A12YV - E1 |
Unit:mm |
OUTDOOR UNIT |
Refrigerant pipe [12.7 |
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(with heat insulator) |
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Stop valve |
Muffler |
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(with service port) |
Outdoor |
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Flared connection |
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heat |
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exchanger |
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Compressor |
Flared connection |
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Stop valve |
Strainer |
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#100 |
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Capillary tube |
Refrigerant pipe [6.35 |
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[3.0x[1.4x550 |
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(with heat insulator) |
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Refrigerant flow in cooling |
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8 |
MAX. REFRIGERANT PIPING LENGTH
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Refrigerant piping |
Piping size O.D : mm |
Length of connecting pipe : m |
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Model |
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Max. length : m |
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A |
Gas |
Liquid |
Indoor unit |
Outdoor unit |
MU-A07YV - |
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E1 |
20 |
9.52 |
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Gas 0.43 |
Gas 0 |
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MU-A09YV - |
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E1 |
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6.35 |
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Liquid 0.5 |
Liquid 0 |
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MU-A12YV - |
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E1 |
25 |
12.7 |
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MAX. HEIGHT DIFFERENCE
Indoor unit
Height difference should be within |
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Refrigerant Piping |
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10m regardless of which unit, |
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w |
Max. Height |
Max.length |
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indoor or outdoor position is high. |
difference 10m |
A |
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE(R410A : g)
Model |
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Outdoor unit precharged |
Refrigerant piping length (one way) |
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10m |
15m |
20m |
25m |
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7m |
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MU-A07YV - E1 |
600 |
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MU-A09YV - |
E1 |
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0 |
60 |
160 |
260 |
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MU-A12YV - |
E1 |
750 |
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360 |
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Calculation : Xg=20g/m x(A-7)m |
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9
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