- 12 -
[
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.
*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.
New Refrigerant (HFC type)
Conventional Refrigerant (HFC type)
R410A
R22
R32/R125
R22
Composition (wt%)
(50/50)
(100)
Type of Refrigerant
Pseudo-azeotropic Refrigerant
Single Refrigerant
Chloride
Not included
Included
Safety Class
A1/A1
A1
Molecular Weight
72.6
86.5
Boiling Point (°C/°F)
-51.4/-60.5
-40.8/-41.4
Steam Pressure
(25°C,MPa/77°F,psi) (gauge)
1.557/226
0.94/136
Saturated Steam Density
(25°C,kg/m
3
/77°F,psi)
64.0
44.4
Flammability
Nonflammable
Nonflammable
Ozone Depletion Coefficient (ODP)
*1
0
0.055
Global Warming Coefficient (GWP)
*2
1730
1700
Refrigerant Charging Method
Refrigerant charging in the liquid
state
Refrigerant charging in the gaseous
state
Replenishment of Refrigerant after a Refrig-
erant Leak
Available
Available
Temperature (°C/°F)
Pressure (gauge)
R410A
R22
MPa/psi
MPa/psi
-20/-4
0.30/44
0.14/20
0/32
0.70/102
0.40/58
20/68
1.34/194
0.81/117
40/104
2.31/335
1.44/209
60/140
3.73/541
2.33/338
65/149
4.17/605
2.60/377
Содержание PUHY-P168
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Страница 134: ... 125 VI Refrigerant Circuit 3 CMB P104 and P108NU GB sub TH25 TH22 LEV3a CP Solenoid valves Block Check valves Block ...
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Страница 368: ... 359 X LED monitor display on the outdoor unit board 1 How to read the LED on the service monitor 361 ...
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