Toshiba RAV-SP404ATP-E Installation Manual page 17

8. When temporary installation and removal of the air
conditioner are repeated such as when leased etc.
9. If the type of refrigerator oil of the existing air
conditioner is other than the following oil (Mineral
oil), Suniso, Freol-S, MS (Synthetic oil), alkyl
benzene (HAB, Barrel-freeze), ester series, PVE
only of ether series.
• The winding-insulation of the compressor may
deteriorate.
NOTE
The above descriptions are results have been confirmed
by our company and represent our views on our air
conditioners, but do not guarantee the use of the existing
pipes of air conditioners that have adopted R410A in
other companies.
Curing of pipes
When removing and opening the indoor or outdoor unit
for a long time, cure the pipes as follows:
• Otherwise rust may be generated when moisture or
foreign matter due to condensation enters the pipes.
• The rust cannot be removed by cleaning, and new
pipes are necessary.
Placement
Term Curing manner
location
1 month or more
Outdoors
Less than 1
Pinching or
month
Indoors Every time
EN-31
Pinching
taping
Are there scratches or dents on the existing pipes?
NO
Is it possible to operate the existing air conditioner?
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
• 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.
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.)
NO
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.
• (Airtight test), Vacuum dry, Refrigerant charge, Gas leak
check
Trial run
- 16 -
YES
Existing pipe: 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 the new pipes.
Piping necessary to change the flare nut/machining size due to pipe
compression.
1) Flare nut width: H
Copper pipe outer
Ø6.4 Ø9.5
diameter
17 22
For R410A
H
For R22 Same as above
2) Flare machining size: A
Copper pipe outer
A
Ø6.4 Ø9.5
diameter
For R410A 9.1 13.2
For R22 9.0 13.0
Becomes a little larger for R410A
Do not apply refrigerator oil to the flare surface.
(mm)
Ø12.7 Ø15.9 Ø19.0
26 29 36
Same as
24 27
above
(mm)
Ø12.7 Ø15.9 Ø19.0
16.6 19.7 24.0
16.2 19.4 23.3
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