Toshiba RAV-SP404AT-E Manuel D'installation page 24

Super Digital Inverter
Are there scratches or dents on the existing pipes?
Is it possible to operate the existing air conditioner?
• After the existing air conditioner is operated in cooling
mode for approx. 30 minutes or longer*, recover the
refrigerant.
• For cleaning the pipes and recovering oil
• Refrigerant recovery: Pump down method
• Remove the existing air conditioner from the piping and
carry out flashing (nitrogen pressure 0.5 MPa) to remove
the remains inside of the pipe.
Was largely discolored oil or a large quantity of
(When the oil deteriorates, the color of the oil
changes to a muddy or black color.)
Connect the indoor/outdoor units to the existing pipe.
• Use a flare nut attached to the main unit for the
indoor/outdoor units. (Do not use the flare nut of the
existing pipe.)
• Re-machine the flare machining size to size for R410A.
• (Airtight test), Vacuum dry, Refrigerant charge, Gas leak
check
EN
NO
YES
remains discharged?
NO
Piping necessary to change the flare nut/machining size due to pipe
compression.
1) Flare nut width: H
H
2) Flare machining size: A
A
Trial run
YES
Existing pipe: Cannot be used.
• Use new pipes.
NO
Nitrogen gas pressure 0.5 MPa
(If there is discharge of remains, it is judged that a
large quantity of remains are present.)
YES
Clean the pipes or use the new pipes.
Copper pipe outer
diameter
For R410A
For R22
Copper pipe outer
diameter
For R410A
For R22
Becomes a little larger for R410A
Do not apply refrigerator oil to the flare surface.
23
Ø6.4 Ø9.5 Ø12.7
17 22 26
Same as above 24
Ø6.4 Ø9.5 Ø12.7
9.1 13.2 16.6
9.0 13.0 16.2
(mm)
Ø15.9 Ø19.0
29 36
Same as
27
above
(mm)
Ø15.9 Ø19.0
19.7 24.0
19.4 23.3