Characteristics Of The Conventional And The New Refrigerants - Mitsubishi Electric CAHV-R450YA-HPB Service Manual

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[8] Characteristics of the Conventional and the New Refrigerants

1. Chemical property
As with R22, the new refrigerant (R454C) is low in toxicity and slightly flammable refrigerant.
However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will
accumulate at the bottom of the room and may cause hypoxia.
If exposed to an open flame, refrigerant will generate poisonous gases. Do not perform installation or service work in a con-
fined area.
Composition (wt%)
Type of Refrigerant
Chloride
Safety Class
Molecular Weight
Boiling Point (°C/°F)
Steam Pressure
(25°C,MPa/77°F,psi) (gauge)
Saturated Steam Density
3
(25°C,kg/m /77°F,psi)
Flammability
Ozone Depletion Coefficient (ODP)
Global Warming Coefficient (GWP)
Refrigerant Charging Method
Replenishment of Refrigerant after
a Refrigerant Leak
*1 When CFC11 is used as a reference
*2 When CO is used as a reference
2
2. Pressure characteristics
The pressure in the system using R454C is 0.9 times as great as that in the system using R22.
Temperature (°C/°F)
-20/-4
0/32
20/68
40/104
60/140
65/149
HWE22020
New Refrigerant (HFC type)
R410A
R32/R125
(50/50)
Pseudo-azeo-
tropic
Refrigerant
Not included
A1/A1
72.6
-51.4/-60.5
1.56/226
64.0
Nonflammable
*1
0
*2
1920
Refrigerant
charging in the l
iquid state
Available
R410A R407C
MPa/psi MPa/psi
0.30/44 0.18/26
0.70/102 0.47/68
1.34/194 0.94/136
2.31/335 1.44/209
3.73/541 2.43/354
4.17/605 2.74/399
- 10 -
R407C
R32/R125/R134a R32/R1234yf
(23/25/52)
Non-azeotropic Non-azeotropic
Refrigerant
Not included Not included
A1/A1
86.2
-43.6/-46.4
0.92/133
42.5
Nonflammable Slightly flammable
0
1624
Refrigerant
charging in the charging in the
liquid state
Available Non available
Saturation Pressure (gauge)
R454C
MPa/psi
0.12/17
0.35/51
0.75/108
1.36/197
2.27/329
2.55/370
Conventional Re-
frigerant (HCFC
type)
R454C R22
R22
(21.5/78.5) (100)
Single Refrigerant
Refrigerant
Included
A2L/A2L A1
90.8 86.5
-45.9/-50.6 -40.8/-41.4
0.88/127 0.94/136
44.5 44.4
Nonflammable
0 0.055
146 1760
Refrigerant Refrigerant
charging in the
liquid state gaseous state
Available
R22
MPa/psi
0.14/20
0.40/58
0.81/117
1.44/209
2.33/338
2.60/377
GB