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6-6-5. Final Installation Checks
Are there scratches or dents on the existing pipes?
NO
YES
Test run
Clean the pipes or use new pipes.
Existing pipes: Cannot be used.
• Use new pipes.
YES
Is it possible to operate the existing air conditioner?
YES
NO
• 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
Connect the indoor/outdoor units to the existing pipe.
• Use a flare nut attached indoor/outdoor units. (Do not
existing pipe.)
• Re-machine the flare machining size to size for R32.
• (Airtight test), Vacuum dry, Refrigerant charge, Gas leak
check
Was largely discolored oil or a large quantity of remains
discharged? (When the oil deteriorates, the color of the oil
changes to a muddy or black color.)
NO
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