3
New Specification
Previous Specification
The incompatible lubricant easily separates from refrigerant
and makes the layer in the upper inside the suction muffler.
The higher position of the returning oil hole enables to return
the lubricant of the upper layer to the compressor.
Since refrigerant and lubricant are compatible each other,
lubricant returns to the compressor through the lower
position returning oil hole.
Compressor
Suction muffler
Returning oil hole
Lubricant
Refrigerant
Compressor
Suction muffler
Returning oil hole
Lubricant and Refrigerant
Compressor
-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])
R407C
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/
f
f
[Gauge])
Lubricant
Refrigerant
New refrigerant
R407C
R32: R125: R134a (23%:25%:52%)
Non-azeotropic refrigerant
Not included
A1/A1
86.2
-43.6
0.9177
42.5
Non combustible
0
1530
From liquid phase in cylinder
Impossible
Incompatible oil
Non
Non
Previous refrigerant
R22
HCFC22 (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 [Gauge])
Saturated steam density [25
:
](Kg/
K
)
Combustibility
ODP
w
1
GWP
w
2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w
1 :Ozone Destruction Parameter : based on CFC11
w
2 :Global Warmth Parameter
: based on CO
2
INFORMATION FOR THE AIR CONDITIONER WITH R-407C REFRIGERANT
This room air conditioner adopts HFC refrigerant (R407C) which will never destroy the ozone layer.
Pay attention to following points.
1
Take sufficient care not to allow water and other contaminations to enter the R407C refrigerant during storage and
installation, since it is more susceptible to contaminations than HCFC (R22) refrigerant.
2
Clean refrigerant pipings should be used.
3
Composition change may occur in R407C since it is a mixed refrigerant. When charging, charge liquid refrigerant to
prevent composition change.
4
Be especially careful when managing the tools.
If dust, dirt, or water mixes in the refrigerant cycle, it may cause decrease of performance.
TECHNICAL CHANGES
1
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