Toshiba RAV-SM1603AT-E Service Manual page 44

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
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 following, 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.
Reference outside diameter
(mm)
Ø9.5
Ø15.9
Ø19.1
RAV-SP1404AT-E, RAV-SP1404ATZ-E, RAV-SP1404ATZG-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.
RAV-SM1603AT-E, RAV-SM1603ATZ-E, RAV-SM1603ATZG-E
• To use an existing Ø19.1 mm pipe, set bit 5 of
SW801 (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.
Wall thickness
(mm)
0.8
1.0
• Never use any pipe with a wall thickness less than
1.0
these thicknesses due to insufficient pressure capacity.
– 44 –
SW802
When shipped from factory
SW801 No.5
ON
1 2 3 4 5 6
When using existing pipe
ON
1 2 3 4 5 6