Precautions for New Refrigerant (R-410A) SiUS34-907
248 Precautions for New Refrigerant (R-410A)
1.3 Service Tools
R-410A is used under higher working pressure, compared to previous refrigerants (R-22, R-407C). 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 (R-22, R-407C) 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 changeHFC HCFC
R-410A R-407C R-22
Gauge manifold
Charge hose
• Do not use the same tools for R-22 and R-
410A.
• Thread specification differs for R-410A and
R-407C.
Charging cylinder • Weighting instrument used for HFCs.
Gas detector • The same tool can be used for HFCs.
Vacuum pump
(pump with reverse flow
preventive function)
• To use existing pump for HFCs, vacuum
pump adaptor must be installed.
Weighting instrument
Charge mouthpiece
• Seal material is different between R
-22 and
HFCs.
• Thread specification is different between R-
410A and others.
Flaring tool (Clutch type) • For R-410A, flare gauge is necessary.
Torque wrench • Torque-up for 1/2 and 5/8
Pipe cutter
Pipe expander
Pipe bender
Pipe assembling oil
• 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.
• Only φ19.1 is changed to 1/2H material while
the previous material is "O".
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