SiE33-003
Measures to Take in the Case of Gas Leaks
New Refrigerant R-407C
183
9. Measures to Take in the Case of Gas Leaks
9.1
Gas Shortage
Problems caused by insufficient gas are almost the same as those for R22 air conditioners. They include
capacity decrease, compressor overheating and frost accumulation on cooler.
(Guideline for judging gas shortage)
The following shows the relationship between pressure and temperature for R22 and R-407C. Use the
data as the guideline when checking pressure levels.
1
Intermediate pressure between saturation liquid pressure and saturation gas pressure at 50˚C
temperature (gauge pressure)
2
Intermediate pressure between saturation liquid pressure and saturation gas pressure at 0˚C
temperature (gauge pressure)
(Composition change and capacity decrease caused by gas leaks)
The following composition change occurs when the refrigerant gas leaks, particularly with R-407C,
since R-407C is a non-azeotropic mixture.
Due to the above composition change, the percentage of R134a increases, thus causing a capacity
drop. The degree of capacity drop that a gas shortage causes is nearly the same in R22 air conditioners
and R-407C air conditioners.
Refrigerant
Condensation pressure
MPa (kgf/cm
²
)
1
Evaporation pressure
MPa(kgf/cm
²
)
2
R22
1.84 (18.8)
0.48 (4.92)
R-407C
2.00 (20.5)
0.51 (5.16)
Si33-003.book Page 183 Monday, June 25, 2001 9:06 AM
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