10
CAUTION
This air conditioner is a dedicated model for refrigerant R410A. Make sure to meet the require-
ments shown below and carry out installation work.
• Use dedicated piping cutters and flaring tools for R410A.
• When making a flare connection, coat the flared inner surface only with ether oil or ester oil.
• Use only the flare nuts attached to the air conditioner. If other flare nuts are used, it may cause
refrigerant leakage.
• To prevent contamination or moisture from getting into the piping, take measures such as pinch-
ing or taping the pipings.
Do not mix substance other than the specified refrigerant such as air into the refrigeration circuit.
If the refrigerant leaks during the work, ventilate the room.
• The refrigerant is pre-charged in the outdoor unit.
• When connecting the pipings to the air conditioner, make sure to use
a spanner and a torque wrench as shown in Fig. 12.
• For the dimension of flared part and the tightening torque, refer to the
Table 1.
• When making a flare connection, coat the flared inner surface only
with ether oil or ester oil.
(Refer to Fig. 13)
Then, turn the flare nut 3 to 4 times with your hand and screw in the
nut.
CAUTION
• Over-tightening may cause the flare nuts to crack or the refrigerant
to leak.
NOTE
• Use the flare nut included with the unit main body.
Table 1
• Refer to Table 1 to determine the proper tightening torque.
Pipe size
Tightening torque
(N·m)
Dimension for processing flare A
(mm)
Flare shape
2.0 ± 9.85.1 ± 7.51)”4/1( 4.6
2.0 ± 0.316.3 ± 3.63)”8/3( 5.9
2.0 ± 4.614.5 ± 9.45)”2/1( 7.21
2.0 ± 5.918.6 ± 6.86)”8/5( 9.51
Fig. 13
Coat the flared inner
surface only with ether
oil or ester oil.
Torque wrench
Spanner
Piping union
Flare nut
Fig. 12
R0.4-0.8
A
90
0
±
2
0
45
0
±
2
0
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