Characteristics Of The New And Conventional Refrigerants - Mitsubishi Electric HP120TNU-A Service Handbook

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
1-2-4

Characteristics of the New and Conventional 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. Refrigerant composition
R410A is a pseudo-azeotropic HFC blend and can almost be handled the same way as a single refrigerant, such as R22. To
be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn
out, the composition of the remaining refrigerant will change and become unsuitable for use.
If the refrigerant leaks out, it may be replenished.
3. 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
HWE18220_GB
New Refrigerant (HFC type)
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
0
*2
2088
Refrigerant charging in
the liquid state
Available
Pressure (gauge)
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 2.44/354
4.17/605 2.75/399
Conventional Refriger-
ant (HCFC type)
R407C
R32/R125/R134a
(23/25/52)
Non-azeotropic Single Refrigerant
Refrigerant
Not included
A1/A1
86.2
-43.6/-46.4
0.9177/133
42.5
Nonflammable Nonflammable
0
1774
Refrigerant charging in Refrigerant charging in
the liquid state 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
R22
R22
(100)
Included
A1
86.5
-40.8/-41.4
0.94/136
44.4
0.055
1810
Available
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