Toshiba RAV-GM1601AT8P-E Service Manual page 37

6-6-4. Curing of pipes
When removing and opening the indoor or
outdoor unit for a long time, cure the pipes as
follows
•Otherwise rust may be generated when moisture or
foreign matter due to condensation enters the pipes.
•The rust cannot be removed by cleaning, and new
pipes are necessary.
Placement
Term
location
1 month or more
Outdoors Less than
1 month
Indoors Every time
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.
Curing manner
Pinching
Pinching or
Taping
YES
YES
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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.