Characteristics Of The Conventional And The New Refrigerants - Mitsubishi Electric PURY-P72 Service Handbook
Hide thumbs
Also See for PURY-P72:
- Service handbook (412 pages) ,
- Service handbook (387 pages) ,
- Service handbook (403 pages)
Table of Contents
[I
Read Before Servicing]
[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.
New Refrigerant (HFC type)
Conventional Refriger-
ant (HCFC type)
R410A
R407C
R22
R32/R125
R321R125/R134a
R22
Composition (wt%)
(50/50)
(23/25152)
(100)
Type of Refrigerant
Pseudo-azeotropic
Non-azeotropic
Single Refrigerant
Refrigerant
Refrigerant
Chloride
Not included
Not included
InclUded
Safety Class
A1/A1
A1/A1
A1
Molecular Weight
72.6
86.2
86.5
Boiling Point (OCrF)
-51.4/-60.5
-43.6/-46.4
-40.8/-41.4
Steam Pressure
1.557/226
0.9177/133
0.94/136
(25°C,MPaI77"F,psi) (gauge)
Saturated Steam Density
64.0
42.5
44.4
(25°C,kg/m
3
177°F,psi)
Flammability
Nonflammable
Nonflammable
Nonflammable
Ozone Depletion Coefficient (ODPf
1
0
0
0.055
Global Warming Coefficient (GWPf2
1730
1530
1700
Refrigerant Charging Method
Refrigerant charging in
Refrigerant charging in
Refrigerant charging in
the liquid state
the liquid state
the gaseous state
Replenishment of Refrigerant after a Refrigerant
Available
Available
Available
Leak
"1 When CFC11 is used as a reference
"2 When CO 2 is used as a reference
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.
Pressure (gauge)
Temperature (OCrF)
R410A
R407C
R22
MPa/psi
MPalpsi
MPa/psi
-20/-4
0.30/44
0.18/26
0.14/20
0/32
0.70/102
0.47/68
0.40158
20/68
1.34/194
0.941136
0.81/117
40/104
2.31/335
1.44/209
1.44/209
60/140
3.73/541
2.44/354
2.33/338
65/149
4.17/605
2.75/399
2.60/377
HWEOB03A
- 13-
GB
Table of Contents
