Daikin FAQ18PVJU Installation Manual page 12

NOTE
• Use a pipe cutter and fl are suitable for the type of refrigerant.
• To prevent dust, moisture or other foreign matter from infi ltrating 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 fl are.
• When connecting the fl are nut, coat the fl are section with ester oil or
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
leak.
• Use the fl are nut included with the unit.
• Refer to Table 1 for tightening torque.
Table 1
Pipe size Tightening torque (ft-lbf)
φ 3/8"
φ 5/8"
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.)
φ 3/8"
φ 5/8"
11
Flare dimensions A (in.)
24.1 – 29.4
45.6 – 55.6
Further tightening angle
60 to 90 degrees
30 to 60 degrees
Piping union
Ester oil or ether oil
0.504 – 0.520
0.760 – 0.776
Recommended arm length of tool (in.)
Approx. 7 7/8"
Approx. 11 13/16"
Torque wrench
Spanner
Flare nut
Fig. 12
Fig. 13
Flare shape (in.)
R0.016-0.031
English