Final Installation Checks - Toshiba RAV-GM301ATP-E Service Manual

6-6-4. Final Installation Checks

Are there no scratch or dent 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
ë 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 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 R32.
∗ (Airtight test), Vacuum dry, Refrigerant charge,
Gas leak check
NO
YES
NO
Test run
YES
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.)
YES
Clean the pipes or use the new pipes.
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FILE NO. SVM-18042-1