English
9
Torque wrench
Flare nut
Piping union
Spanner
Fig. 13
Ester oil or ether oil
Fig. 14
6. REFRIGERANT PIPING WORK
<For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.>
<Execute heat insulation work completely on both sides of the gas piping and the liquid piping.
Otherwise, a water leakage can result sometimes.>
(When using a heat pump, the temperature of the gas piping can reach up to approximately 120
°
C,
so
use
insulation which is sufficiently resistant
.)
<Also, in cases where the temperature and humidity of the refrigerant piping sections might exceed
30
°
C
or RH80
%,
reinforce the refrigerant insulation. (20 mm or thicker) Condensation may form on
the surface of the insulating material.>
<Before refrigerant piping work, check which type of refrigerant is used. Proper operation is not
possible if the types of refrigerant are not the same.>
CAUTION
• Use a pipe cutter and flare suitable for the type of refrigerant.
• Apply ester oil or ether oil around the flare portions before connectiong.
• To prevent dust, moisuture 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.
• 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. 13)
• Refer to
“
Table 3
”
for the dimensions of flare nut spaces.
• 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. 14)
CAUTION
Over-tightening may damage the flare and cause
a refrigerant leakage.
NOTE
• Use the flare nut included with the unit main body.
Table 3
• Refer to
“
Table 3
” to determine the proper tightening torque.
CAUTION
Over-tightening may damage the flare and cause a refrigerant leakage.
Pipe size
Tightening torque
Flare dimensions
A (mm)
Flare
ø6.4(1/4
"
)
14.2 - 17.2 N·m
(144 - 175 kgf·cm)
8.7-9.1
ø9.5(3/8
"
)
32.7 - 39.9 N·m
(333 - 407 kgf·cm)
12.8-13.2
ø12.7(1/2
"
)
49.5 - 60.3 N·m
(505 - 615 kgf·cm)
16.2 - 16.6
