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EN 25
Digital Inverter
H
A
Nitrogen gas pressure 0.5 MPa
Existing pipes: Cannot be used.
• Use new pipes.
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.
When using a Ø19.1 mm pipe for the gas pipe of the first
branching pipe
•
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: Refrigerant recovery equipment
• (Airtight test), Vacuum dry, Refrigerant charge, Gas leak
check
• 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.
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.)
(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
Clean the pipes or use new pipes.
In case of twin pipes, also be sure to flush the
branching pipe.
Note]
Turn the existing pipe switch on the cycle control P.C.
board of the outdoor unit to ON side. At shipment from
factory OFF ON for existing pipe (Refer to the table
below.) (Be sure to set the contents in the table below
in order to restrict the refrigerating cycle pressure of
the equipment in the pipe standard.)
Existing pipe SW
Trial run
1) Flare nut width: H
2) Flare machining size: A
(mm)
(mm)
Becomes a little larger for R410A
For R410A
For R22
Copper pipe
outer
diameter
For R410A
For R22
Same as above
Same as
above
Do not apply refrigerator oil to the flare surface.
Bit 3 of SW802
ON
Switch
Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.1
17 22 26 29 36
24 27
Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.1
9.1 13.2 16.6 19.7 24.0
9.0 13.0 16.2 19.4 23.3
Copper pipe
outer
diameter
NO
YES
YES
YES
NO
NO
Are there scratches or dents on the existing pipes?
Is it possible to operate the existing air conditioner?