Mitsubishi Electric PCA-RP71KAQ / PU-P71YHAR [5/32] Installing the refrigerant piping

Mitsubishi Electric PCA-RP100KAQ / PUHZ-ZRP100YKA [5/32] Installing the refrigerant piping

4. Installing the refrigerant piping

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45 2

4.3. Indoor unit (Fig. 4-3)

Installing procedures

1. Slide the supplied pipe cover

over the gas tubing until it is pressed against the

sheet metal inside the unit.

2. Slide the provided pipe cover

over the liquid tubing until it is pressed against

the sheet metal inside the unit.

3. Tighten the pipe covers

and

at the both ends (20 mm) with the supplied

bands

Gas tubing

Pipe cover

Liquid tubing

Press the pipe cover against the sheet metal.

Band

Refrigerant tubing heat insulating material

Pipe cover

4.4. For twin/triple combination

Refer to the outdoor unit installation manual.

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 thick-

nesses 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 com-

pounds, oxidants, debris, or dust.

Warning:

When installing or relocating, or servicing the air conditioner, use only the

speciﬁ ed refrigerant (R410A) to charge the refrigerant lines. Do not mix it

with any other refrigerant and do not allow air to remain in the lines.

If air is mixed with the refrigerant, then it can be the cause of abnormal high

pressure in the refrigerant line, and may result in an explosion and other haz-

ards.

The use of any refrigerant other than that speciﬁ ed for the system will cause

mechanical failure or system malfunction or unit breakdown. In the worst

case, this could lead to a serious impediment to securing product safety.

RP35, 50 RP60-140

Liquid pipe

[

6.35 thickness 0.8 mm

[

9.52 thickness 0.8 mm

Gas pipe

[

12.7 thickness 0.8 mm

[

15.88 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 2 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

(N·m)

[

6.35 17 14-18

[

6.35 22 34-42

[

9.52 22 34-42

[

12.7 26 49-61

[

12.7 29 68-82

[

15.88 29 68-82

[

15.88 36 100-120

[

19.05 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

[

6.35 Ο

[

6.35 —

—

[

9.52 Ο

[

9.52 Ο

Gas side

[

12.7 Ο

[

15.88 Ο

[

15.88 Ο

Ο : Factory ﬂ are nut attachment to the heat exchanger.

Flare cutting dimensions

Copper pipe O.D.

(mm)

Flare dimensions

[

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

Copper pipe O.D.

(mm)

B (mm)

Flare tool for R410A

Clutch type

[

6.35 (1/4″) 0 - 0.5

[

9.52 (3/8″) 0 - 0.5

[

12.7 (1/2″) 0 - 0.5

[

15.88 (5/8″) 0 - 0.5

[

19.05 (3/4″) 0 - 0.5

Fig. 4-3

Fig. 4-1

Fig. 4-2

90° ± 0.5°

R0.4 - R0.8

Die

Copper pipe

Mitsubishi Electric PCA-RP71KAQ / PU-P71YHAR [5/32] Installing the refrigerant piping

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