50
6-6-5. Final Installation Checks
NO
YES
YES
YES
NO
NO
Are there scratches or dents 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
• Refrigerant recovery: Pump down method
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.)
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
Test run
Existing pipes: Cannot be used.
• Use new pipes.
Clean the pipes or use new pipes.