EN
23
Super Digital Inverter
Do not apply refrigerator oil to the flare surface.
H
A
1) Flare nut width: H
2) Flare machining size: A
(mm)
(mm)
Ø19.0
Ø15.9
Ø12.7
Ø9.5
Ø6.4
36
29
26
22
17
27
24
Same as above
Copper pipe outer
diameter
For R410A
For R22
Ø19.0
Ø15.9
Ø12.7
Ø9.5
Ø6.4
24.0
19.7
16.6
13.2
9.1
23.3
13.0
9.0
19.4
16.2
Copper pipe outer
diameter
For R410A
For R22
Becomes a little larger for R410A
Is it possible to operate the existing air conditioner?
Are there scratches or dents on the existing pipes?
NO
YES
NO
Clean the pipes or use the new pipes.
Nitrogen gas pressure 0.5 MPa
NO
YES
YES
• 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
Existing pipe: Cannot be used.
• Use new pipes.
• Refrigerant recovery: Pump down method
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 R410A.
• 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.
• (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.)
Trial run
(If there is discharge of remains, it is judged that a
large quantity of remains are present.)
Piping necessary to change the flare nut/machining size due to pipe
compression.
Same as
above
