Technical Changes - Mitsubishi Electric MU-A09WA Service Manual

Revision : A
• MU-A12WA-
has been added.
1
1

TECHNICAL CHANGES

MU09TW MU-A09WA
MU12TN MU-A12WA
1.Outdoor unit model has been changed.
2.Refrigerant has been changed. (R22
3.Compressor has been changed.
MUA12WA MU-A12WA-
1.WIRING DIAGRAM has been changed.
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.
1 As 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.
2 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.
3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (°F)
Steam pressure [77°F](PSIG)
Saturated steam density [77°F](lb/ft
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
R410A)
1
New refrigerant
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
3
)
Non combustible
From liquid phase in cylinder
Possible
Incompatible oil
: based on CO
2
R410A
A1/A1
72.6
-60.5
225.82
3.995
0
1730
Non
Non
2
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-41.4
136.34
2.772
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non