Mitsubishi Electric PCA-RP71HAQ / PUHZ-ZRP71VHA [5/24] Installing the refrigerant piping

A Die

B Copper pipe





Fig. 4-2







A Gas tubing (with insulation) E Pipe cover 3

B Liquid tubing (with insulation) F Press the pipe cover against the sheet metal.

C Band 6 G Refrigerant tubing heat insulating material

D Pipe cover 2

Fig. 4-3

4.2. Indoor unit (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 insula

tion materials (specic gravity of 0.03, thickness of 9 mm or more).

•

Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening

are nut.

•

Use two wrenches to tighten piping connections.

• Use leak detector or soapy water to check for gas leaks after connections are

completed.

•

Use refrigerant piping insulation provided to insulate indoor unit connections. Insulate

carefully following shown below.

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

Available pipe size

RP35, 50 RP60 RP71

RP100, 125, 140

Liquid side

ø6.35

ø6.35 – –

ø9.52 ø9.52

Gas side

ø12.7

– – –

ø15.88 ø15.88

– – – ø19.05

P25 P35, 50, 60, 71 P100, 125, 140

Liquid side

ø6.35

– –

– ø9.52

ø9.52

Gas side

ø12.7

– –

– ø15.88

–

– – ø19.05

: Factory are nut attachment to the heat-exchanger.

4. Installing the refrigerant piping

øA





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

Be sure to only use the are nuts

that came with the unit.

A Flare cutting dimensions

Copper pipe O.D.

(mm)

Flare

dimensions

øA dimensions (mm)

ø6.35 8.6

- 9.0

ø9.52 12.6

- 13.0

ø12.7 15.8

- 16.2

ø15.88 19.0

- 19.4

ø19.05 22.9

- 23.3

B Flare nut tightening torque

Copper pipe O.D.

(mm)

ightening torque

(N·m)

Tightening angle

(Guideline)

ø6.35 14

- 18 60˚ - 90˚

ø9.52 35

- 42 60˚ - 90˚

ø12.7 50

- 58 30˚ - 60˚

ø15.88 75

- 80 30˚ - 60˚

ø19.05 100

- 140 20˚ - 35˚

Fig. 4-1

Copper pipe O.D.

(mm)

Flare tool for R-22·R407C Flare tool for R410A

Clutch type

ø6.35 (1/4”) 0 - 0.5 1.0 - 1.5

ø9.52 (3/8”) 0 - 0.5 1.0 - 1.5

ø12.7 (1/2”) 0 - 0.5 1.0 - 1.5

ø15.88 (5/8”) 0 - 0.5 1.0 - 1.5

ø19.05 (3/4”) 0 - 0.5 1.0 - 1.5

Installing procedures

1. Slide the supplied pipe cover

2 over

the gas tubing until it is pressed against the

sheet metal inside the unit.

2. Slide the provided pipe cover

3 over

the liquid tubing until it is pressed against

the sheet metal inside the unit.

3. Tighten the pipe covers

2 and

3 at the both ends (15 - 20 mm) with the supplied

bands 4.

•

After connecting the refrigerant piping to the indoor unit, be sure to test the pipe

connections for gas leakage with nitrogen gas. (Check that there is no refrigerant

leakage from the refrigerant piping to the indoor unit.)

Conduct the airtightness test before connecting the outdoor unit stop valve and the

refrigerant pipe.

If the test is conducted after the valve and pipe are connected, gas, which is used

for checking the airtightness, will leak from the stop valve and ow into the outdoor

unit,

resulting in abnormal operation.

Warning:

When installing the unit, securely connect the refrigerant pipes before start-

ing

the compressor.

90°±0.5°

45°±2°

R0.4 - R0.8

RG79D721H02_en.indd 5 2012/10/09 (火) 午後 3:13:37

Mitsubishi Electric PCA-RP71HAQ / PUHZ-ZRP71VHA [5/24] Installing the refrigerant piping

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