Toshiba RAV-SM2804AT8ZG-E, RAV-SM2244AT8ZG-E Handling of Existing Pipe, Recovering Refrigerant

6-6-6. 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

•Before recovering the refrigerant in the existing system, perform a cooling operation for at least 30 minutes.

Cautions for using existing pipe

•Do not reuse a flare nut to prevent gas leaks.

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 leaks.

•There may be a problem with the pressure resis- tance of the branching pipes of the existing piping.

Replace them with branch pipes (sold separately).

When the pipe corresponds to any of the following, do not use it. Install a new pipe instead.

•The pipe has been opened (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 thicknesses.

Reference outside	Wall thickness	Material
diameter (mm)	(mm)
6.4	0.8	—
9.5	0.8	—
12.7	0.8	—
15.9	1.0	—
19.1	1.2	—
22.2	1.0	Half hard
28.6	1.0	Half hard

•Do not use any pipe with a wall thickness less than these thicknesses due to insufficient pressure capacity.

•When using a Ø19.1 mm gas pipe for the existing piping, 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.

SW802

When shipped from factory		When using existing pipe
	ON		ON

1 2 3 4 1 2 3 4

6-6-7. Recovering Refrigerant

Use the refrigerant recovery equipment to recover the refrigerant.

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