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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
• Remove the existing air conditioner from the piping
and carry out flushing (nitrogen pressure 0.5 MPa) to
remove any remains inside of the pipe.
Note: In case of twin pipes, also be sure to flush the
branching pipe.
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
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,
R410A.
• (Airtight test), Vacuum dry, Refrigerant charge,
Gas leak check
51-EN
NO
YES
black color.)
NO
Test run
YES
Existing pipes: Cannot be used.
• Use new pipes.
NO
Nitrogen gas pressure 0.5 MPa
(If there is discharge of remains, it is judged that a
large quantity of remains are present.)
YES
Clean the pipes or use new pipes.
Piping necessary to change the flare nut /
machining size due to pipe compression
1) Flare nut width: H
Copper pipe
outer diameter
For R32, R410A
H
For R22
2) Flare machining size: A
Copper pipe
outer diameter
A
For R32, R410A
For R22
Becomes a little larger for R32, R410A
Do not apply refrigerator oil to the flare surface.
‒ 51 ‒
Installation Manual
(mm)
Ø6.4
Ø9.5
Ø12.7 Ø15.9
17
22
26
29
Same as above
24
27
(mm)
Ø6.4
Ø9.5
Ø12.7 Ø15.9
9.1
13.2
16.6
19.7
9.0
13.0
16.2
19.4
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