Precautions for New Refrigerant (R410A)
Mini UM S/M
196
Precautions for New Refrigerant (R410A)
1.2
Service Tools
R410A is used under higher working pressure, compared to previous refrigerants (R22,R407C).
Furthermore, the refrigerating machine oil has been changed from Suniso oil to Ether oil, and if
oil mixing is occurred, sludge results in the refrigerants and causes other problems. Therefore,
gauge manifolds and charge hoses that are used with a previous refrigerant (R22,R407C) can
not be used for products that use new refrigerants.
Be sure to use dedicated tools and devices.
Tool compatibility
As for the charge mouthpiece and packing, 1/2UNF20 is necessary for mouthpiece size of
charge hose.
Copper tube material and thickness
* O: Soft (Annealed)
H: Hard (Drawn)
Tool
Compatibility
Reasons for change
HFC
HCFC
R410A
R407C
R22
Gauge manifold
Charge hose
2
Do not use the same tools for R22 and
R410A.
2
Thread specification differs for R410A
and R407C.
Charging cylinder
2
Weighting instrument used for HFCs.
Gas detector
2
The same tool can be used for HFCs.
Vacuum pump
(pump with reverse flow
preventive function)
2
To use existing pump for HFCs,
vacuum pump adaptor must be
installed.
Weighting instrument
Charge mouthpiece
2
Seal material is different between R22
and HFCs.
2
Thread specification is different
between R410A and others.
Flaring tool (Clutch type)
2
For R410A, flare gauge is necessary.
Torque wrench
2
Torque-up for 1/2 and 5/8
Pipe cutter
Pipe expander
Pipe bender
Pipe assembling oil
2
Due to refrigerating machine oil
change. (No Suniso oil can be used.)
Refrigerant recovery
device
Check your recovery device.
Refrigerant piping
See the chart below.
2
Only
φ
19.1 is changed to 1/2H material
while the previous material is "O".
Pipe size
φ
6.4
φ
9.5
φ
12.7
φ
15.9
φ
19.1
φ
22.2
φ
25.4
φ
28.6
φ
31.8
φ
38.1
φ
44.5
Material
O
O
O
O
O
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
Material
O
O
O
O
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
Thickness
[mm]
0.8
0.8
0.8
1.0
1.0
1.0
1.0
1.0
1.2
1.4
1.6
Thickness
[mm]
0.8
0.8
0.8
1.0
1.0
1.0
1.0
1.0
1.1
1.4
1.6
R407C
R410A
Mini UM.book Page 196 Monday, January 24, 2005 11:32 AM
