Specification·················································7 - Mitsubishi Electric MSH-C18TV Service Manual

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.
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 w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1 :Ozone Destruction Parameter : based on CFC11
w2 :Global Warmth Parameter
New 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.
Compressor
Conversion chart of refrigerant temperature and pressure
(MPa[Gauge])
4.0
3.5
R407C
3.0
R22
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-30 -20 -10 0
R32: R125: R134a (23%:25%:52%)
From liquid phase in cylinder
: based on CO
2
Suction muffler
Returning oil hole
Lubricant
Refrigerant
(:)
10 20 30 40 50 60
New refrigerant
R407C
Non-azeotropic refrigerant
Not included
A1/A1
86.2
-43.6
0.9177
42.5
Non combustible
0
1530
Impossible
Incompatible oil
Non
Non
Since refrigerant and lubricant are compatible each other,
lubricant returns to the compressor through the lower
position returning oil hole.
Compressor
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
3
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
Previous Specification
Suction muffler
Returning oil hole
Lubricant and Refrigerant
f [Gauge])