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4. Installing the refrigerant piping

4.1. Precautions

For devices that use R410A refrigerant

• Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera-

tion oil applied to the ﬂ ared sections.

• Use C1220 copper phosphorus for copper and copper alloy seamless pipes,

to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses

speciﬁ ed in the table below. Make sure the insides of the pipes are clean

and do not contain any harmful contaminants such as sulfuric compounds,

oxidants, debris, or dust.

Warning:

When installing or moving the air conditioner, use only the speciﬁ ed refriger-

ant (R410A) to charge the refrigerant lines. Do not mix it with any other refrig-

erant and do not allow air to remain in the lines. Air enclosed in the lines can

cause pressure peaks resulting in a rupture and other hazards.

RP35, 50 RP60-140

Liquid pipe ø6.35 thickness 0.8 mm ø9.52 thickness 0.8 mm

Gas pipe ø12.7 thickness 0.8 mm ø15.88 thickness 1.0 mm

• Do not use pipes thinner than those speciﬁ ed above.

4.2. Connecting pipes (Fig. 4-1)

• When commercially available copper pipes are used, wrap liquid and gas pipes

with commercially available insulation materials (heat-resistant to 100 °C or more,

thickness of 12 mm or more).

• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-

sulation materials (speciﬁ c gravity of 0.03, thickness of 9 mm or more).

• Apply thin layer of refrigerant oil to pipe and joint seating surface before tighten-

ing ﬂ are nut.

• Use two wrenches to tighten piping connections.

• Use refrigerant piping insulation provided to insulate indoor unit connections. In-

sulate carefully.

Flare nut tightening torque

Copper pipe O.D.

(mm)

Flare nut O.D.

(mm)

Tightening torque

(mm)

ø6.35 17 14-18

ø6.35 22 34-42

ø9.52 22 34-42

ø12.7 26 49-61

ø12.7 29 68-82

ø15.88 29 68-82

ø15.88 36 100-120

ø19.05 36 100-120

Apply refrigerating machine oil over the entire ﬂ are seat surface.

Use correct ﬂ are nuts meeting the pipe size of the outdoor unit.

Available pipe size

RP35, 50 RP60 RP71-140

Liquid side

ø6.35

ø6.35 —

—

ø9.52

Gas side

ø12.7

ø15.88 ø15.88

: Factory ﬂ are nut attachment to the heat exchanger.

Flare cutting dimensions

Copper pipe O.D. Flare dimensions

(mm) A dimensions (mm)

6.35 8.7 - 9.1

9.52 12.8 - 13.2

12.7 16.2 - 16.6

15.88 19.3 - 19.7

19.05 23.6 - 24.0

90 0.5

R0.4~R0.8

45 2

Fig. 4-1

Die

Copper pipe

Fig. 4-2

Copper pipe O.D.

B (mm)

(mm)

Flare tool for R410A

Clutch type

6.35 (1/4")

1.0 - 1.5

9.52 (3/8")

1.0 - 1.5

12.7 (1/2")

1.0 - 1.5

15.88 (5/8")

1.0 - 1.5

19.05 (3/4")

1.0 - 1.5

RG79D251K01_EN_0227.indd 5RG79D251K01_EN_0227.indd 5 28/02/2007 09:48:4928/02/2007 09:48:49

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Mitsubishi PLA-RP Manuale di Installazione Pagina 5

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