Toshiba RAV-SM2246AT8J-E Service Manual page 49

6-6-5. Final Installation Checks
Is there no scratch or dent on the existing pipes?
Is it possible to operate the existing air conditioner?
∗ After the existing air conditioner operated in cooling mode
for approx. 30 minutes or longer*, recover the refrigerant.
∗ For cooling the pipes and recovering of 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.
Note] In case of twin, also be sure to flash the
branching pipe.
Was not largely discolored oil or
a large quantity of remains discharged?
(When the oil deteriorates, the color of the
oil changes to muddy and 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
YES
YES
Trial run
Existing pipe: NO * Use a new pipes.
NO
Nitrogen gas pressure 0.5 Mpa
(If there is discharge of remains,
it is judged that there is a large quantity of remains.)
NO
Clean the pipes or use the new pipes.
If you are in trouble of
pipe cleaning, please contact us.
Piping necessary to change the flare nut/
machining size due to pipe compression.
1) Flare nut width: H
Copper pipe
outer dia.
For R410A
H
For R22
2) Flare machining size: A
Copper pipe
outer dia.
A
For R410A
For R22
Becomes large a little for R410A
Do not apply the refrigerator oil to the flare surface.
– 49 –
Ø6.4 Ø9.5 Ø12.7 Ø15.9
17 22 26 29
24 27
Same as above
Ø6.4 Ø9.5 Ø12.7 Ø15.9
9.1 13.2 16.6 19.7
9.0 13.0 16.2 19.4
(mm)
Ø19.1
36
Same
as above
(mm)
Ø19.1
24.0
23.3