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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
to remove any remains inside of the pipe.
Note:
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.
existing pipe.)
R410A.
(Airtight test), Vacuum dry, Refrigerant charge,
Gas leak check
37-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.
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
– 37 –
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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