6-6-5. Final Installation Checks
Existing pipe: NO
∗
Use a new pipes.
Clean the pipes or use the new pipes.
Is it possible to operate the existing air conditioner?
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.)
∗ 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
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.
Connect the indoor/outdoor units to the existing pipe.
ë Use a flare nut attached to the main unit for the
indoor/outdoor units.
(Do not use the flare nut of the existing pipe.)
ë Re-machine the flare machining size to size for R32.
Nitrogen gas pressure 0.5 Mpa
If you are in trouble of
pipe cleaning, please contact us.
Is there no scratch or dent on the existing pipes?
YES
YES
NO
(If there is discharge of remains,
it is judged that there is a large quantity of remains.)
NO
SVM-13072.indb 37SVM-13072.indb 37 11/01/13 1:53 PM11/01/13 1:53 PM
Trial run
∗ (Airtight test), Vacuum dry, Refrigerant charge,
Gas leak check
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