11
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:
Table 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
A
90
0
Ⳳ
2
0
45
0
Ⳳ
2
0
01_EN_3PN07521-1.fm Page 11 Monday, June 19, 2006 5:05 PM
