Final Installation Checks - Toshiba RAV-SM404ATP-E Service Manual

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.
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FILE NO. SVM-14059