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

[ I Read Before Servicing ]

[8] Characteristics of the Conventional and the New Refrigerants

1. Chemical property
The new refrigerant R32 is as 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.
Because the refrigerant is slightly flammable, do not perform installation or service work in a confined 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
*1
(ODP)
Global Warming Coefficient
*2
(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. Refrigerant composition
R32 is a single refrigerant and can be handled in a similar manner as with other single refrigerants, such as R22.
If the refrigerant leaks out, it may be replenished.
3. Pressure characteristics
The pressure in the system using R32 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
HWE20010
New Refrigerant
R32
R32
(100)
Single Refrigerant Pseudo-azeotropic
Not included
A2L
52.0
-51.7/-61.0
1.588/230
47.4
Slightly flammable Nonflammable
0
675
Refrigerant charging Refrigerant charging
in the liquid state/re- in the liquid state
frigerant charging in
the gaseous state
Available
R32 R410A
MPa/psi MPa/psi
0.30/44 0.30/44
0.71/103 0.70/102
1.37/199 1.34/194
2.38/345 2.31/335
3.83/555 3.73/541
4.28/621 4.17/605
- 9 -
(HFC type)
R410A R407C
R32/R125 R32/R125/R134a
(50/50) (23/25/52)
Non-azeotropic
Refrigerant Refrigerant
Not included Not included
A1/A1 A1/A1
72.6
-51.4/-60.5 -43.6/-46.4
1.557/226 0.9177/133
64.0
Nonflammable
0
2088
Refrigerant charging
in the liquid state
Available Available
Pressure (gauge)
R407C
MPa/psi
0.18/26
0.47/68
0.94/136
1.44/209
2.44/354
2.75/399
Conventional Refrig-
erant (HCFC type)
R22
R22
(100)
Single Refrigerant
Included
A1
86.2 86.5
-40.8/-41.4
0.94/136
42.5 44.4
Nonflammable
0 0.055
1774 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