6-6-6. Handling of Existing Pipe
When using the existing pipe, carefully check it for
the following:
s
Wall thickness (within the specified range)
s
Scratches and dents
s
Water, oil, dirt, or dust in the pipe
s
Flare looseness and leakage from welds
s
Deterioration of copper pipe and heat insulator
Cautions for using existing pipe
s
Do not reuse the flare to prevent gas leak.
Replace it with the supplied flare nut and then
process it to a flare.
s
Blow nitrogen gas or use an appropriate means to
keep the inside of the pipe clean.
If discolored oil or much residue is discharged,
wash the pipe.
s
Check welds, if any, on the pipe for gas leak.
When the pipe corresponds to any of the follow-
ing, do not use it. Install a new pipe instead.
s
The pipe has been open (disconnected from
indoor unit or outdoor unit) for a long period.
s
The pipe has been connected to an outdoor unit
that does not use refrigerant R22, R410A or
R407C.
s
The existing pipe must have a wall thickness equal
to or larger than the following thickness.
s
Never use any pipe with a wall thickness less than
these thicknesses due to insufficient pressure
capacity.
Reference outside diameter
(mm)
Ø9.5
Ø15.9
Ø19.1
Wall thickness
(mm)
0.8
1.0
1.0
FILE NO. SVM-18041
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