Toshiba RAV-SM1403AT-E1 User Manual

– 29 –

Do not apply the refrigerator oil to the flare surface.

Existing pipe: NO * Use a new pipes.

Clean the pipes or use the new pipes.

∗ 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)

Trial run

Is it possible to operate the existing air conditioner?

Was not largely discolored oil or

a large quantity of remains discharged?

(When the oil deteriorates, the color of the

oil changes to muddy and black color.)

∗  After the existing air conditioner operated in cooling mode 

  for approx. 30 minutes or longer*, recover the refrigerant. 
∗  For cooling the pipes and recovering of oil
  •  Refrigerant recovery: Pump down method

∗  Remove the existing air conditioner from the piping and 

  carry out flashing (nitrogen pressure 0.5 Mpa) to remove 
  the remains inside of the pipe. 
  Note]  In case of twin, also be sure to flash the 
   

 

branching 

pipe.

 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.

∗  (Airtight test), Vacuum dry, Refrigerant charge, 

  Gas leak check

Nitrogen gas pressure 0.5 Mpa

H

A

(If there is discharge of remains, 
it is judged that there is a large quantity of remains.)

If you are in trouble of 
pipe cleaning, please contact us.

1)  Flare nut width: H

2)  Flare machining size: A

(mm)

36

Ø19.1

29

Ø15.9

26

27

24

Ø12.7

22

Ø9.5

17

Ø6.4

Same

as above

Copper pipe
outer dia.

For R22

For R410A

Same as above

(mm)

24.0

Ø19.1

19.7

Ø15.9

16.6

Ø12.7

13.2

Ø9.5

9.1

23.3

19.4

16.2

13.0

9.0

Ø6.4

Copper pipe
outer dia.

For R22

For R410A

Becomes large a little for R410A

Is there no scratch or dent on the existing pipes?

YES

YES

NO

NO

See page 9-3-2.