Refrigerant R410A: Special Precautions When Installing Unit; Characteristics Of New Refrigerant R410A; Checklist Before Installation - Sanyo COOL Installation Instructions Manual

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.
Ether-type oil is used for compressor oil for R410A-type units, which is different from
CAUTION
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
ø6.35 (1/4")
ø19.05 (3/4")
Size of flare
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.
A Specification
Flare tool for R410A
0 – 0.5 mm
0 – 0.5 mm
D
A
Flare tool for R410A
28
Conventional flare tool (for R22)
1.0 – 1.5 mm
1.0 – 1.5 mm
D
Conventional flare tool (R22)
A