Sanyo CL2462R, C2462R service manual Refrigerant R410A Special Precautions When Installing Unit

12.SERVICE PROCEDURES

11.REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN INSTALLING UNIT

11-1. Characteristics of New Refrigerant R410A

11-1-1. What is New Refrigerant R410A?

R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture which do not adversely affect the earth’s ozone layer. Its refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22.

11-1-2. Components (mixing proportions)

HFC32 (50%) / HFC125 (50%)

11-1-3. 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.

11-2. Checklist Before Installation

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 protrusion).

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
ø19.05 (3/4")	0 – 0.5 mm		1.0 – 1.5 mm

Size of flare D D

A

A

Flare tool for R410A Conventional flare tool (R22)

Flare nut: Because the new refrigerant R410A operates at 1.6 times higher pressure than the conventional refrigerant R22, the flare nuts that came with the unit must be used.

SM830092

– 55 –