11
English
NOTE
Use a pipe cutter and fl are suitable for the type of refrigerant.
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To prevent dust, moisture or other foreign matter from infi ltrating the tube, either pinch the end or cover it
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with tape.
Do not allow anything other than the designated refrigerant to get mixed into the refrigerant circuit, such
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as air, etc.
If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly right away.
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The outdoor unit is charged with refrigerant.
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Ester oil or ether oil
Fig. 13
Torque wrench
Spanner
Piping union
Flare nut
Fig. 12
Use copper alloy seamless pipes.
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Be sure to use both a spanner and torque wrench together, as shown
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in the drawing, when connecting or disconnecting pipes to/from the
unit.
(Refer to Fig. 12)
Refer to “Table 1” for the dimensions of fl are.
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When connecting the fl are nut, coat the fl are section with ester oil or
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ether oil, rotate three or four times fi rst, then screw in.
(Refer to Fig. 13)
CAUTION
Over-tightening may cause the fl are nuts to crack or the refrigerant to
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leak.
Use the fl are nut included with the unit.
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Refer to Table 1 for tightening torque.
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Table 1
Pipe size
Tightening torque (ft-lbf)
Flare dimensions A (in.)
Flare shape (in.)
φ
3/8”
24.1 – 29.4
0.504 – 0.520
R0.016-0.031
A
90
0
Ⳳ
2
0
45
0
Ⳳ
2
0
φ
5/8”
45.6 – 55.6
0.760 – 0.776
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 fi nished, make sure to check that there is no gas leak.
When you keep on tightening the fl are nut with a spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten the fl are nut the angle shown below:
Table 2
Pipe size (in.)
Further tightening angle
Recommended arm length of tool (in.)
φ
3/8”
60 to 90 degrees
Approx. 7 7/8”
φ
5/8”
30 to 60 degrees
Approx. 11 13/16”
3PN07521̲2A̲EN.indd 11
3PN07521̲2A̲EN.indd 11
2008/12/26 13:41:43
2008/12/26 13:41:43
