Characteristics Of The Conventional And The New Refrigerants - Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook

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[11] 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 Refrig-
erant 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. The entire refrigerant does not need to be replaced.
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
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
1730
Refrigerant charging in the liquid
state
Available
Pressure (gauge)
R410A R22
MPa/psi MPa/psi
0.30/44 0.14/20
0.70/102 0.40/58
1.34/194 0.81/117
2.31/335 1.44/209
3.73/541 2.33/338
4.17/605 2.60/377
- 12 -
Conventional Refrigerant (HFC type)
0
Refrigerant charging in the gaseous
R22
R22
(100)
Single Refrigerant
Included
A1
86.5
-40.8/-41.4
0.94/136
44.4
Nonflammable
0.055
1700
state
Available