12.REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
12-1. Characteristics of New Refrigerant R410A
12-1-1. What is New Refrigerant R410A?
R410A is a new refrigerant that contains two types of
12-1-2. Components (mixing proportions)
HFC32 (50%) / HFC125 (50%)
12-1-3. Characteristics
●Less toxic, more chemically stable refrigerant
●The composition of refrigerant R410A changes whether it is in a gaseous phase or liquid phase. Thus, when there is a refrigerant leak the basic performance of the air conditioner may be degraded because of a change in composition of the remaining refrigerant. Therefore, do not add new refrigerant. Instead, recover the remaining refrigerant with the refrigerant recovery unit. Then, after evacuation, totally recharge the specified amount of refrigerant with the new refrigerant at its normal mixed composition state (in liquid phase).
●When refrigerant R410A is used, the composition will differ depending on whether it is in gaseous or liquid phase, and the basic performance of the air conditioner will be degraded if it is charged while the refrigerant is in gaseous state. Thus, always charge the refrigerant while it is in liquid phase.
CAUTION
12-2. Checklist Before Servicing
Use a
Diameter of tube (ø) D |
| A Specification | |
|
|
| |
Flare tool for R410A |
| Conventional flare tool (for R22) | |
|
| ||
|
|
|
|
ø6.35 (1/4") | 0 – 0.5 mm |
| 1.0 – 1.5 mm |
|
|
|
|
ø9.52 (3/8") | 0 – 0.5 mm |
| 1.0 – 1.5 mm |
|
|
|
|
●Size of flare
øD
A
øD
Spacer
1.2
A
Flare tool for R410A | Conventional flare tool (R22) |
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