Toshiba RAV-SM1104ATJP-E, Installation Manual, Page: 42 / 48

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82-EN 81-EN
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, triple 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
Are there scratches or dents on the existing pipes?
Piping necessary to change the flare nut / machining
size due to pipe compression
1) Flare nut width: H
2) Flare machining size: A
Do not apply refrigerator oil to the flare surface.
(mm)
Copper
pipe outer
diameter
Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0
For
R410A
17 22 26 29 36
For R22
Same as
above
24 27
Same
as
above
H
(mm)
Copper
pipe outer
diameter
Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0
For
R410A
9.1 13.2 16.6 19.7 24.0
For R22 9.0 13.0 16.2 19.4 23.3
Becomes a little larger for R410A
A
YES
NO
YES
NO
YES
NO
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
and carry out flushing (nitrogen pressure 0.5 MPa)
to remove any remains inside of the pipe.
Note: In case of twin pipes, also be sure to flush the
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 black color.)
Nitrogen gas pressure 0.5 MPa
Existing pipes: Cannot be used.
‡ Use new pipes.
Clean the pipes or use new pipes.
(If there is discharge of remains, it is judged that a
large quantity of remains are present.)
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 Ø19 mm or bigger is used for
the outdoor unit of SM80 (3 HP): (Our R410A model 3
to 6 HP gas pipe size is Ø15.9 mm)
See page 15 “Existing piping”.
‡ (Airtight test), Vacuum dry, Refrigerant charge, Gas
leak check
Test run
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