- 14 -
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.
Branching pipe for simultaneous operation
system
• In the concurrent twin system, when TOSHIBA has
specified that branching pipe is to be used, it can be
reused.
Branching pipe model name:
RBC-TWP30E2, RBC-TWP50E2
On the existing air conditioner for simultaneous
operation system (twin system), there are cases of
branch pipes being used that have insufficient
compressive strength.
In such case, please change the piping to a branch
pipe for R410A.
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
location
Term
Curing manner
Outdoors
1 month or more
Pinching
Less than 1
month
Pinching or
taping
Indoors
Every time
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.
In case that a gas pipe
Ø
19 mm or bigger is used for the
outdoor unit of SP80 (3 HP): (Our R410A model 3 to 5 HP
gas pipe size is
Ø
15.9 mm)
• 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
• (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 PC
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
4, 5 HP
Switch
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Ø19.0
17
22
26
29
36
24
27
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Ø19.0
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?
EN-27
EN-28
