Toshiba RAV-SP1404AT8Z-TR, RAV-SP1104AT8ZG-TR, RAV-SP1104AT8-TR Appendix, 115, EN-28, 29-EN

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.

–

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, Barrel-freeze), ester series, PVE only of ether series.

•The winding-insulation of the compressor may deteriorate.

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.

115 –

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
	R410A
Thickness		0.8	0.8	0.8	1.0	1.0
	R22
	(R407C)

•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
Outdoors	1 month or more	Pinching
	Less than 1 month	Pinching or taping
Indoors	Every time

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 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

1) Flare nut width: H							(mm)
		Copper pipe
		outer	Ø6.4	Ø9.5	Ø12.7	Ø15.9	Ø19.0
		diameter
	H	For R410A	17	22	26	29	36
		For R22	Same as above		24	27	Same as
							above
2) Flare machining size: A
							(mm)
	A	Copper pipe
		outer	Ø6.4	Ø9.5	Ø12.7	Ø15.9	Ø19.0
		diameter
		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

Do not apply refrigerator oil to the flare surface.

EN-28 28 29 29-EN