Service Manual

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7-6-6. Handling of Existing Pipe
When using the existing pipe, carefully check it for
the following:
• Wall thickness (within the specified range)
• Scratches and dents
• Water, oil, dirt, or dust in the pipe
• Flare looseness and leakage from welds
• Deterioration of copper pipe and heat insulator
Cautions for using existing pipe
• Do not reuse the flare to prevent gas leak.
Replace it with the supplied flare nut and then
process it to a flare.
• 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.
• 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.
• The pipe has been open (disconnected from
indoor unit or outdoor unit) for a long period.
• The pipe has been connected to an outdoor unit
that does not use refrigerant R22, R410A or
R407C.
• The existing pipe must have a wall thickness equal
to or larger than the following thickness.
• Never use any pipe with a wall thickness less than
these thicknesses due to insufficient pressure
capacity.
1234
ON
1234
ON
SW802
When shipped from factory When using existing pipe
RAV-SP804AT-E
• To use an existing Ø19.1 mm pipe, set bit 3 of
SW802 (switch for existing pipe) on the P.C. board
of the outdoor unit to ON.
In this case, the heating performance may be
reduced depending on the outside air temperature
and room temperature.
Reference outside diameter
(mm)
Ø9.5
Ø15.9
Ø19.1
Wall thickness
(mm)
0.8
1.0
1.0