9
English
• If a torque wrench is not available, there is a place where the tight-
ening torque will suddenly increase if a normal wrench is used to
tighten the flare nut.
From that position, further tighten the flare nut the angle shown
below.
• After all the piping has been connected, use nitrogen to perform a
gas leak check.
Precautions for connecting pipes
• Be careful not to let the interunit piping come into contact with the
compressor terminal cover.
Adjust the height of the insulation material on liquid pipe when it has
the possibility of getting in contact with the terminal. Also make sure
that the interunit piping does not touch the mounting bolt of the com-
pressor.
(Refer to figure 26)
1.
Terminal cover
2.
Compressor
3.
Corking, etc.
4.
Insulation material
5.
Bolts
6.
Interunit piping
• If installing the outdoor unit higher than the indoor unit, caulk the
space around insulation and tubes because condensation on the
check valve can seep through to the indoor unit side.
[Preventing foreign objects from entering]
• Plug the pipe through-holes with putty or insulating material (pro
cured locally) to stop up all gaps, as shown in figure 27.
(Insects or small animals entering the outdoor unit may cause a
short in the control box.)
(Refer to figure 27)
1.
Putty or insulating material
2.
(field supply)
7-6 Heat insulation of piping
• If you think the humidity inside the ceiling might exceed 86°F and
RH80%, reinforce the insulation on the cooling piping. (At least
0.78in. thick) (Condensation may form on the surface of the insula-
tion.)
• Be sure to insulate the interunit piping (liquid and gas-side) and the
refrigerant branch kit. (Not insulating them may cause leaking.)
(The highest temperature that the gas-side piping can reach is around
248°F, so be sure to use insulating material which is very resistant.)
CAUTION
For local insulation, be sure to insulate all the way to the pipe con-
nections inside the machine.
Exposed piping may cause leaking or burns on contact.
Pipe size
Further tightening angle
Recommended arm length
of tool (in.)
φ
3/8”
(9.5mm)
60°~ 90 °
Approx. 7 7/8 (200mm)
φ
5/8”
(15.9mm)
30°~ 60°
Approx. 11 13/16 (300mm)
Refrigerant oil
01_EN_3PN07193-6F.fm Page 9 Tuesday, September 1, 2009 4:13 PM
