Daikin FXAQ09MVJU Installation Manual download pdf (Page 12)

NOTE

• Use a pipe cutter and flare suitable for the type of refrigerant.

• To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the end or cover

it with tape.

• Do not allow anything other than the designated refrigerant to get mixed into the refrigerant circuit, such

as air, etc.

• If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly right away.

• The outdoor unit is charged with refrigerant.

• Use copper alloy seamless pipes.

• Be sure to use both a spanner and torque wrench together, as shown

in the drawing, when connecting or disconnecting pipes to/from the

unit. (Refer to Fig. 12)

• Refer to “Table 1” for the dimensions of flare.

• When connecting the flare nut, coat the flare section (both inside and

outside) with ester oil or ether oil, rotate three or four times first, then

screw in. (Refer to Fig. 13)

CAUTION

• Over-tightening may cause the flare nuts to crack or the refrigerant

to leak.

• Use the flare nut included with the unit.

• Refer to Table 1 for tightening torque.

Table 1

Not recommended but in case of emergency

You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may

follow the installation method mentioned below.

After the work is finished, make sure to check that there is no gas leak.

When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque

suddenly increases. From that position, further tighten the flare nut the angle shown below:

Ta ble 2

Pipe size Tightening torque (ft-lbf) Flare dimensions A (in.) Flare shape (in.)

φ 1/4” 10.5 – 12.7 0.343 – 0.358

φ 3/8” 24.1 – 29.4 0.504 – 0.520

φ 1/2” 36.5 – 44.5 0.638 – 0.654

φ 5/8” 45.6 – 55.6 0.760 – 0.776

Pipe size (in.) Further tightening angle Recommended arm length of tool (in.)

φ 1/4” 60 to 90 degrees Approx. 5 7/8”

φ 3/8” 60 to 90 degrees Approx. 7 7/8”

φ 1/2” 30 to 60 degrees Approx. 9 13/16”

φ 5/8” 30 to 60 degrees Approx. 11 13/16”

Ester oil or ether oil

Fig. 13

Torque wrench

Spanner

Piping union

Flare nut

Fig. 12

R0.016-0.031

Ⳳ

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Daikin FXAQ09MVJU Installation Manual Page 12

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