Characteristics Of The Conventional And The New Refrigerants; Chemical Property; Pressure Characteristics - Mitsubishi Electric CAHV-P500YA-HPB Service Handbook

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[8] Characteristics of the Conventional and the New Refrigerants

1. Chemical property

As with R22, the new refrigerant (R407C) 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 R407C is 1.1 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
HWE10060
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
*2
1975
Refrigerant charging in
the liquid state
Available
Saturation 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 2.43/354
4.17/605 2.74/399
- 9 -
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
1653
Refrigerant charging in
the liquid state
Available
MPa/psi
0.14/20
0.40/58
0.81/117
1.44/209
2.33/338
2.60/377
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
1700
Refrigerant charging in
the gaseous state
Available
R22
GB