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Cautions for refrigerant piping work
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same
as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working
pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
1 Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 0.7 mm or below.)
Diagram below: Piping diameter and thickness
Nominal
Outside
dimensions(inch)
diameter (mm)
1/4
6.35
3/8
9.52
1/2
12.70
5/8
15.88
3/4
19.05
2 Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other refrig-
erants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A has been
specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A
also has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe
flaring dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.
Use torque wrench corresponding to each dimension.
Dimension A
Flare cutting dimensions
Nominal
Outside
dimensions(inch)
diamer (mm)
1/4
6.35
3/8
9.52
1/2
12.70
5/8
15.88
3/4
19.05
3 Tools for R410A (The following table shows whether conventional tools can be used or not.)
Tools and materials
Use
Gauge manifold
Air purge, refrigerant charge
Charge hose
and operation check
Gas leak detector
Gas leak check
Refrigerant recovery equipment
Refrigerant recovery
Refrigerant cylinder
Refrigerant charge
Applied oil
Apply to flared section
Safety charger
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Charge valve
Prevent gas from blowing out
when detaching charge hose
Vacuum pump
Vacuum drying and air
purge
Flare tool
Flaring work of piping
Bend the pipes
Bender
Pipe cutter
Cut the pipes
Welder and nitrogen gas cylinder
Weld the pipes
Refrigerant charging scale
Refrigerant charge
Vacuum gauge or thermis-
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
tor vacuum gauge and
gerant to thermistor vacuum gauge)
vacuum valve
Charging cylinder
Refrigerant charge
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
OCH502C
Thickness (mm)
R410A
R22
0.8
0.8
0.8
0.8
0.8
0.8
1.0
1.0
1.0
*
1.0
Dimension A (
+0
) (mm)
-0.4
R410A
R22
9.1
9.0
13.2
13.0
16.6
16.2
19.7
19.4
—
23.3
R410A tools
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil, ether oil and
alkylbenzene oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adap-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
4
*
Use 1/2H or H pipes.
Flare nut dimensions
Nominal
Outside
dimensions(inch)
diameter(mm)
1/4
6.35
3/8
9.52
1/2
12.70
5/8
15.88
3/4
19.05
Can R22 tools be used?
(Usable if equipped
with adapter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Dimension B
Dimension B(mm)
R410A
R22
17.0
17.0
22.0
22.0
26.0
24.0
29.0
27.0
—
36.0
Can R407C tools be used?
Ester oil, ether oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adapter for rever-
se flow)
(Usable by adjusting
flaring dimension)
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