Toshiba RAV-SM2244AT8Z-E, RAV-SM2804AT8ZG-E, RAV-SM2244AT8ZG-E Digital Inverter, Existing pipe SW

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.

– 109

•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: Refrigerant recovery equipment

•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.

–

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.

When using a Ø19.1 mm pipe for the gas pipe of the first branching pipe

￿Turn the existing pipe switch on the cycle control P.C.

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

Trial 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	Ø19.1
		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	Ø6.4	Ø9.5	Ø12.7	Ø15.9	Ø19.1
		outer
		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 25