Toshiba RAV-SM1104ATP-E Installation Manual page 42

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
Term Curing manner
location
1 month or more Pinching
Outdoors
Less than 1 month
Pinching or taping
Indoors Every time
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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 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.)
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.
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
YES
Existing pipes: 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 new pipes.
Piping necessary to change the flare nut / machining
size due to pipe compression
1) Flare nut width: H
(mm)
Copper
pipe outer Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0
diameter
For
17 22 26 29 36
R410A
Same
H
Same as
For R22 24 27 as
above
above
2) Flare machining size: A
(mm)
Copper
pipe outer Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0
A
diameter
For
9.1 13.2 16.6 19.7 24.0
R410A
For R22 9.0 13.0 16.2 19.4 23.3
Becomes a little larger for R410A
Do not apply refrigerator oil to the flare surface.
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