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6-6-3. Branching pipe for
simultaneous operation
system
In the concurrent twin system, when TOSHIBA-
specified branching pipe is used, it can be reused.
Branching pipe model name:
RBC-TWP30E, RBC-TWP50E
On the existing Air to Water Heat Pump for
simultaneous operation system (twin system), there is
a case of using branch pipe that has insufficient
compressive strength. In this case please change it to
the branch pipe for R32 or R410A.
6-6-4. Curing of pipes
When removing and opening the indoor unit or outdoor
unit for a long time, cure the pipes as follows:
• Otherwise rust may generate when moisture or
foreign matter due to dewing enters in the pipes.
• The rust cannot be removed by cleaning, and a new
piping work is necessary.
6-6-5. Final installation checks
Place position 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?
NO
YES
Test run
Clean the pipes or use new pipes.
Existing pipes: Cannot be used.
• Use new pipes.
YES
Is it possible to operate the existing Air to Water Heat Pump?
YES
NO
Connect the indoor / outdoor units to the existing pipe.
• Use a flare nut attached indoor / outdoor units.
(Do not existing pipe.)
• Re-machine the flare machining size to size for R32.
• (Airtight test), Vacuum dry, Refrigerant charge,
Gas leak check.
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
• After the existing Air to Water Heat Pump is operated in
cooling mode for approx. 30 minutes or longer, * recover
the refrigerant.
• Refer to “6-8-1. Recovery”.
• For cleaning the pipes and recovering oil.
• Refrigerant recovery: Pump down method.
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