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[11] Characteristics of the Conventional and the New Refrigerants
1. Chemical property
As with R22, refrigerants R410A and R134A are low in toxicity and chemically stable nonflammable refrigerants.
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.
C
o
m
p
o
t i s
o i
n
(
t w
%
)
T
y
p
e
f o
R
e
r f
g i
e
a r
t n
C
l h
r o
d i
e
S
a
e f
y t
C
a l
s s
M
o
e l
c
l u
r a
W
e
g i
t h
B
i o
n i l
g
P
o
n i
( t
/ C
) F
Steam Pressure
(25 C,MP a/77 F,psi) (gauge)
Saturated Steam Density
3
(25 C,kg/m
/77 F, psi)
F
a l
m
m
a
l i b
y t i
Ozone Depletion Coeff icient (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. The entire refrigerant does not need to be replaced.
3. Pressure characteristics
R410A has slightly higher operating pressure compared with R22.
Temperature ( C/ F )
-20/-4
0/32
20/68
40/104
60/140
65/149
New Refrigerant (HFC type)
R410A
R32/R125
5 (
0
5 /
P
s
e
u
d
o
a -
Refrigerant
N
t o
n i
c
A
1
A /
7
2
5 -
1
4 .
- /
1.557/226
64.0
N
o
f n
a l
m
*1
0
*2
1730
Refrigerant charging in
the liquid state
Available
Pressure (gauge)
R410A
R134a
MPa/psi
MPa/psi
0.30/44
0.13/19
0.70/102
0.29/42
1.34/194
0.57/83
2.31/335
1.02/148
3.73/541
1.68/244
4.17/605
1.89/274
- 16 -
R134a
R134a
) 0
(100)
e z
t o
o r
p
c i
Single-
Refrigerant
u l
d
e
d
Not contained
1
A1/A1
6 .
102.0
60.5
-26.1/-15.0
0.67/97
32.3
m
a
b
e l
Non-flammable
0
1300
Liquid charging
Possible
R22
MPa/psi
0.14/20
0.40/58
0.81/117
1.44/209
2.33/338
2.60/377
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