English
9
• 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 25)
1.
Compressor
2.
Corking, etc.
3.
Insulation material
4.
Bolts
5.
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 26. (Figure 26
indicates the forward case. Do the same in case of other directions.)
Insects or small animals entering the outdoor unit may cause a short
in the control box.
(Refer to figure 26)
1.
Putty or insulating material
2.
(field supply)
7-5 Heat insulation of piping
• Highly recommended to insulate the interunit piping (liquid and gas-
side) and the refrigerant branch kit. (Not insulating them may cause
leaking.)
• The insulation dimension is recommended as following:
• When using commercial copper pipes and fittings, observe the fol-
lowing:
a) Insulation of pipes should be done after performing air tight test
and vacuum drying on page 11.
b) Heat transfer rate: 0.041 to 0.052W/Mk (0.024 to 0.030BTU/fth°F
(0.035 to 0.045kcal/mh°C)).
c) Be sure to use insulation that is designed for use with HVAC Sys-
tems.
d) The highest temperature that the gas-side piping can reach is
around 248°F(120°C), so be sure to use insulating material which
is very resistant.
(The highest temperature that the gas-side piping can reach is
around 248°F(120°C), 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.)
3/8”
(9.5mm)
60°~ 90 °
Approx. 7 7/8 (200mm)
5/8”
(15.9mm)
30°~ 60°
Approx. 11 13/16 (300mm)
3/4”
(19.1mm)
20°~ 35°
Approx. 17 11/16 (450mm)
Ambient temperature: 86°F
(30°C), humidity : Below 80% RH
Ambient temperature: 86°F
(30°C), humidity : 80% RH and
above
Minimum thickness : 9/16 inch
(15mm)
Minimum thickness : 3/4 inch
(20mm)
Refrigerant oil
01_EN_3P591321-1B.fm 9 ページ ２０１９年１２月２４日 火曜日 午後５時１９分
