FLOOR AND CEILING TYPE AIR CONDITIONERS
No. OB339
HFC
utilized
SERVICE MANUAL |
R410A |
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Wireless type
Models
MUCF-A18WV - E1
MUCF-A24WV - 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 ··············
Indication of model name
9. TROUBLESHOOTING················
MUCF-A18WV - E1
MUCF-A24WV - 
10. DISASSEMBLY INSTRUCTIONS···········
E1
11. PARTS LIST····················
NOTE:
•This service manual describes technical data of outdoor units.
As for indoor units MCF-A18WV- E1 and MCF-A24WV- E1 , refer to the service manual OB338.
1 
TECHNICAL CHANGES
MUCF-18NV - E3 MUCF-A18WV - E1
1.Refrigerant has changed. (R22 R410A)
2.Refrigerant system diagram has changed.
•Diameter of stop valve has changed. (Gas: [15.88 [12.7)
•Accumulator has removed.
3.Oil separator has been added.
4.Compressor has changed. (NH33VMDT RN196VHSHT)
MUCF-24NV - E3 MUCF-A24WV - E1
1.Refrigerant has changed. (R22 R410A)
2.Refrigerant system diagram has changed.
•Diameter of stop valve has changed. (Liquid: [9.52 [6.35)
3.Compressor has changed. (NH47VMDT NN29VBAHT)
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 |
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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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Compressor |
refrigerating oil of the upper layer to flow back to the |
Compressor |
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Compressor |
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Oil back hole |
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compressor. |
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Suction muffler |
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Suction muffler |
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Refrigerating oil |
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Oil back hole |
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Refrigerant |
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Refrigerating oil /Refrigerant |
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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])
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 and 15.88 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
3
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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6.35 |
0.8 mm |
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For liquid |
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Heat resisting foam plastic |
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0.8 mm |
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9.52 |
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12.7 |
0.8 mm |
Specific gravity 0.045 Thickness 8 mm |
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For gas
15.881.0 mm
•Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88). Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88), as the pressure resistance is insufficient.
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 |
6.35 |
17 |
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17 |
9.52 |
22 |
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22 |
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12.7 |
26 |
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24 |
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15.88 |
29 |
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27 |
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 |
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MUCF-A18WV - E1 |
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MUCF-A24WV - E1 |
Air inlet |
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(back and side) |
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Piping |
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Drain hose |
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Air outlet |
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Drain outlet |
3 SPECIFICATION
Outdoor model
Function
Power supply
Capacity |
Air flow(High) |
K /h |
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Capacity |
kW |
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Dehumidification |
r/h |
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Electrical |
data |
Power outlet |
A |
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Runnning current |
A |
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Power input |
W |
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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(High) |
dB |
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Special |
remarks |
Fan speed(High) |
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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NOTE: Test conditions are based on ISO 5151 Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB(24°C) Indoor-Outdoor piping length : 5m
MUCF-A18WV - E1 |
MUCF-A24WV - E1 |
Cooling |
Cooling |
Single phase |
Single phase |
230V, 50Hz |
230V, 50Hz |
4.8 |
6.0 |
2.4 |
3.1 |
2,196 |
2,322 |
15 |
25 |
7.98 |
10.62 |
1,744 |
2,370 |
95 |
97 |
37 |
74 |
7.59 |
10.07 |
0.39 |
0.55 |
2.65 |
2.45 |
RN196VHSHT |
NN29VBAHT |
1,300 |
1,900 |
C-R 1.80 |
C-R 0.80 |
C-S 3.00 |
C-S 1.64 |
RA6V50-OG |
RA6V60-MA |
WHT-BLK 116 |
WHT-BLK 71 |
BLK-RED 111 |
BLK-RED 89 |
850o605o290 |
850o605o290 |
44 |
60 |
52 |
53 |
825 |
873 |
1 |
1 |
1.45 |
1.85 |
520 (NEO22) |
1,200 (NEO22) |
5
4 
NOISE CRITERIA CURVES
NOISE CRITERIA CURVES
MUCF-A18WV - E1
FAN SPEED SPL(dB(A)) |
LINE |
High 52
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:
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90 |
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BAR |
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MICRO |
80 |
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dB re 0.0002 |
70 |
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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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50 |
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PRESSURE |
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NC-50 |
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40 |
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NC-40 |
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SOUND |
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30 |
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NC-30 |
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BAND |
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20 |
APPROXIMATE |
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OCTAVE |
THRESHOLD OF |
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HEARING FOR |
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NC-20 |
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CONTINUOUS |
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10 |
NOISE |
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63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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BAND CENTER FREQUENCIES, Hz
MUCF-A24WV - E1
FAN SPEED SPL(dB(A)) |
LINE |
High 53
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:
BAR |
90 |
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MICRO |
80 |
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0.0002 |
70 |
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NC-70 |
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dB re |
60 |
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LEVEL, |
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NC-60 |
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50 |
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PRESSURE |
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NC-50 |
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40 |
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NC-40 |
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SOUND |
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30 |
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BAND |
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NC-30 |
20 |
APPROXIMATE |
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OCTAVE |
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THRESHOLD OF |
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HEARING FOR |
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NC-20 |
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CONTINUOUS |
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10 |
NOISE |
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63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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BAND CENTER FREQUENCIES, Hz
OUTDOOR UNIT
1m
MICROPHONE
6
5 
OUTLINES AND DIMENSIONS
MUCF-A18WV - E1 MUCF-A24WV - E1
OUTDOOR UNIT
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Drainage |
355 |
20 |
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350 |
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hole [16.2 |
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Air in |
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35 |
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248 |
90 |
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290 |
310 |
345 |
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Air in |
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Drainage |
Air out |
50 |
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3holes [33 |
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30 |
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605
292 |
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157 |
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20 |
183 |
100 |
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500 |
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850 |
74 |
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7
Unit: mm
or more |
100mm |
100mm |
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more |
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or |
100mm |
or |
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more |
more |
350mm |
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or |
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or |
more |
500mm |
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Service panel
Liquid refrigerant pipe joint
Refregerant pipe (flared) [6.35
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- |
30 |
35 |
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Gas refregerant pipe joint
161Refregerant pipe
(flared) [12.7 (MUCF-A18WV)
[15.88 (MUCF-A24WV)
6 |
WIRING DIAGRAM |
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MUCF-A18WV - E1 |
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MODEL WIRING DIAGRAM |
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OUTDOOR UNIT |
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TB2 |
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TO |
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2 |
WHT |
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INDOOR UNIT |
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1 |
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52C |
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CONNECTING |
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BLK |
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12V |
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DSAR |
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CIRCUIT BREAKER TB1 |
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BRN |
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52C |
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L |
BRN |
WHT |
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C |
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NO |
COM WHT |
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POWER SUPPLY |
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N |
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C1 |
RED |
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BLU |
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MC |
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~/N |
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S |
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230V 50Hz |
PE |
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GRN/YLW |
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BLK |
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R |
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C2 |
ORNRED 1 |
ORNRED |
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WHT |
2 |
WHT MF |
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BLU |
3 |
BLK |
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4 |
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NAME |
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C1 |
COMPRESSOR CAPACITOR |
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MC |
COMPRESOR (INNER PROTECTOR) |
52C |
COMPRESSOR CONTACTOR |
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C2 |
OUTDOOR FAN CAPACITOR |
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MF |
OUTDOOR FAN MOTOR (INNER PROTECTOR) |
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DSAR |
SURGE ABSORBER |
TB1,TB2 TERMINAL BLOCK |
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NOTES: 1.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing. |
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2.Use copper conductors only. (For field wiring) |
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3.Symbols below indicate. |
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: Terminal block |
: Connector |
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MUCF-A24WV - E1 |
MODEL WIRING DIAGRAM |
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OUTDOOR UNIT |
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TB2 |
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TO |
2 |
WHT |
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INDOOR UNIT |
1 |
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X1 |
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CONNECTING |
BLK |
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12V |
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DSAR |
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BRN |
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X1 |
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WHT |
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WHT |
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C |
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BRN |
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C1 |
RED |
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MC |
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52C |
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CIRCUIT BREAKER |
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52C |
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BLK S |
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L |
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BRN |
BRN NO |
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R |
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BLU |
COM |
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POWER SUPPLY |
N |
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RED |
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RED |
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~/N |
BLU |
NO |
COM |
C2 |
1 |
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230V 50Hz |
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ORN |
ORN |
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PE |
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WHT |
2 |
WHT |
MF |
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GRN/YLW |
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BLU |
3 |
BLK |
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4 |
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TB1 |
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SYMBOL |
NAME |
SYMBOL |
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NAME |
SYMBOL |
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NAME |
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C1 |
COMPRESSOR CAPACITOR |
MC |
COMPRESSOR (INNER PROTECTOR) |
X1 |
RELAY |
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C2 |
OUTDOOR FAN CAPACITOR |
MF |
OUTDOOR FAN MOTOR (INNER PROTECTOR) 52C COMPRESSOR CONTACTOR |
DSAR |
SURGE ABSORBER |
TB1,TB2 |
TERMINAL BLOCK |
NOTES: 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
8
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