9.REFRIGERANT R410A:

SPECIAL PRECAUTIONS WHEN SERVICING UNIT

9-1. Characteristics of New Refrigerant R410A

9-1-1. What is New Refrigerant R410A?

R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22.

9-1-2. Components (mixing proportions)

HFC32 (50%) / HFC125 (50%)

9-1-3. 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

Ether-type oil is used for compressor oil for R410A-type units, which is different from the mineral oil used for R22. Thus more attention to moisture prevention and faster replacement work compared with conventional models are required.

9-2. Checklist before Servicing

Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of extrusion) by using the flare spacer.

Diameter of tube D

 

Specification A

Flare tool for R410A

 

Conventional flare tool (for R22)

 

 

Dia.6.35 mm (1/4")

 

 

 

Dia.9.52 mm (3/8")

0 to 0.5 mm

 

1.2 mm

Dia.12.7 mm (1/2")

 

 

 

 

Dia.15.88 mm (5/8")

 

 

 

Size of flare

D

A

D

Spacer

 

 

A

Flare tool for R410A

Conventional flare tool (R22)

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Sanyo SAP-CMRV1426EH-F Characteristics of New Refrigerant R410A, Checklist before Servicing, Components mixing proportions
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SAP-CMRV1926EH, SAP-CMRV1426EH-F specifications

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