Super Digital Inverter
15 APPENDIX
Work instructions
The existing R22 and R407C piping can be reused for our digital inverter R410A product installations.
WARNING
6. When the existing air conditioner is removed after |
refrigerant has been recovered. |
Check if the oil is judged to be clearly different from |
normal oil. |
• The refrigerator oil is copper rust green in color: |
There is the possibility that moisture has mixed with the |
Super Digital Inverter
Are there scratches or dents on the existing pipes?
NO
Is it possible to operate the existing air conditioner?
YES
YES
NO
Existing pipes: Cannot be used.
•Use new pipes.
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Confirming the existence of scratches or dents on the existing pipes and confirming the reliability of the pipe strength are conventionally referred to the local site.
If the specified conditions can be cleared, it is possible to update existing R22 and R407C pipes to those for R410A models.
Basic conditions needed to reuse existing pipes
Check and observe the presence of three conditions in the refrigerant piping works.
1.Dry (There is no moisture inside of the pipes.)
2.Clean (There is no dust inside of the pipes.)
3.Tight (There are no refrigerant leaks.)
Restrictions for use of existing pipes
In the following cases, the existing pipes should not be reused as they are. Clean the existing pipes or exchange them with new pipes.
| oil and rust has been generated inside the pipe. |
• | There is discolored oil, a large quantity of residue, or a |
| bad smell. |
• | A large quantity of shiny metal dust or other wear |
| residue can be seen in the refrigerant oil. |
7. When the air conditioner has a history of the compressor | |
failing and being replaced. | |
• | When discolored oil, a large quantity of residue, shiny |
| metal dust, or other wear residue or mixture of foreign |
| matter is observed, trouble will occur. |
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,
•The
NOTE
•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
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.
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1.When a scratch or dent is heavy, be sure to use new pipes for the refrigerant piping works.
2.When the existing pipe thickness is thinner than the specified “Pipe diameter and thickness,” be sure to use new pipes for the refrigerant piping works.
•The operating pressure of R410A is high (1.6 times that of R22 and R407C). If there is a scratch or dent on
the pipe or a thinner pipe is used, the pressure strength may be inadequate, which may cause the pipe to break in the worst case.
*Pipe diameter and thickness (mm)
Pipe outer diameter | Ø6.4 | Ø9.5 | Ø12.7 | Ø15.9 | Ø19.0 | |
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Thickness |
| 0.8 | 0.8 | 0.8 | 1.0 | 1.0 |
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•In case the pipe diameter is Ø12.7 mm or less and the thickness is less than 0.7 mm, be sure to use new pipes for the refrigerant piping works.
3.When the outdoor unit was left with the pipes disconnected, or the gas leaked from the pipes and the pipes were not repaired and refilled.
•There is the possibility of rain water or air, including moisture, entering the pipe.
4.When refrigerant cannot be recovered using a refrigerant recovery unit.
•There is the possibility that a large quantity of dirty oil or moisture remains inside the pipes.
5.When a commercially available dryer is attached to the existing pipes.
•There is the possibility that copper green rust has been generated.
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, RBC-TRP100E
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 |
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Outdoors | 1 month or more | Pinching |
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| Less than 1 month | Pinching or taping |
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Indoors | Every time |
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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.)
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In case that a gas pipe Ø19 mm or bigger is used for the outdoor unit of SP80 (3 HP): (Our R410A model 3 to 6 HP gas pipe size is Ø15.9 mm)
→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
Switch
Bit 3 of SW802 → ON
•(Airtight test), Vacuum dry, Refrigerant charge, Gas leak check
Test run
Piping necessary to change the flare nut/ machining size due to pipe compression
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| Ø6.4 | Ø9.5 | Ø12.7 | Ø15.9 | Ø19.0 |
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| 17 | 22 | 26 | 29 | 36 |
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| For R22 |
| Same as above | 24 | 27 | Same as |
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| 2) Flare machining size: A |
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| Ø6.4 | Ø9.5 | Ø12.7 | Ø15.9 | Ø19.0 |
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| For R410A |
| 9.1 | 13.2 | 16.6 | 19.7 | 24.0 |
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| For R22 |
| 9.0 | 13.0 | 16.2 | 19.4 | 23.3 |
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Becomes a little larger for R410A
Do not apply refrigerator oil to the flare surface.
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