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4. Installing the refrigerant piping
4.1. Precautions for devices that use R410A refrigerant
• Refer to 1.5. for precautions not included below on using air conditioners with R410A refrigerant.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses speci-
fied in the table to the below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants,
debris, or dust.
Warning:
When installing or relocating, or servicing the outdoor unit, use only the specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other
refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this
could lead to a serious impediment to securing product safety.
ø6.35 mm, ø9.52 mm, ø12.7 mm
ø15.88 mm, ø19.05 mm, ø22.2 mm, ø25.4 mm
• D o not use pipes thinner than those specified above.
• Use 1/2 H or H pipes if the diameter is 19.05 mm or larger.
• The thicknesses listed in the table above are based on Japanese standards. Use pipes with a maximum working pressure of 4.15 MPa or higher according to
local standards.
Caution:
Follow the instructions below to prevent abrasive components contained in sandpaper and cutting tools from entering the refrigerant circuit because those com-
ponents can cause failures of the compressor and valves.
• To deburr pipes, use a reamer or other deburring tools, not sandpaper.
• To cut pipes, use a pipe cutter, not a grinder or other tools that use abrasive materials.
• When cutting or deburring pipes, do not allow cutting chips or other foreign matters to enter the pipes.
• If cutting chips or other foreign matters enter pipes, wipe them off the inside of the pipes.
Thickness 0.8 mm
Thickness 1.0 mm
en
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