Characteristics Of The Conventional And The New Refrigerants - Mitsubishi Electric e Series Service Handbook

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[8] Characteristics of the Conventional and the New Refrigerants

1. Chemical property
As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable 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 R410A is 1.6 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
HWE1417B
R410A
R32/R125
(50/50)
Pseudo-azeotropic
Refrigerant
Not included
A1/A1
72.6
-51.4/-60.5
1.557/226
64.0
Nonflammable
*1
*2
2088
Refrigerant charging in
the liquid state
Available
Saturation Pressure (gauge)
R410A
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
- 9 -
New Refrigerant (HFC type)
R407C
R32/R125/R134a
(23/25/52)
Non-azeotropic
Refrigerant
Not included
A1/A1
86.2
-43.6/-46.4
0.9177/133
42.5
Nonflammable
0 0
1774
Refrigerant charging in
the liquid state
Available
R407C
Conventional Refriger-
ant (HCFC type)
R22
R22
(100)
Single Refrigerant
Included
A1
86.5
-40.8/-41.4
0.94/136
44.4
Nonflammable
0.055
1810
Refrigerant charging in
the 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