Handling Of Existing Pipe; Cautions For Using Existing Pipe - Toshiba RAV-GM301ATP-E Service Manual

6-6-5. 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, R32 or
R407C.
The existing pipe must have a wall thickness equal
to or larger than the following thickness.
Reference outside diameter
(mm)
Ø6.4
Ø9.5
Ø12.7
Wall thickness
(mm)
0.8
0.8
0.8
– 35 –
Piping necessary to change the flare nut/
machining size due to pipe compression.
1) Flare nut width: H
Copper pipe
Ø6.4
outer dia.
For R410A,
17
R32
H
For R22
Same as above
2) Flare machining size: A
Copper pipe
Ø6.4
outer dia.
A
For R410A,
9.1
R32
For R22 9.0
Becomes large a little for R410A/R32
Do not apply the refrigerator oil to the flare surface.
Never use any pipe with a wall thickness less than
these thicknesses due to insufficient pressure
capacity.
FILE NO. SVM-18042-1
(mm)
Ø9.5 Ø12.7 Ø15.9 Ø19.0
22 26 29 36
Same
24 27
as above
(mm)
Ø9.5 Ø12.7 Ø15.9 Ø19.0
13.2 16.6 19.7 24.0
13.0 16.2 19.4 23.3