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6. REFRIGERANT PIPING WORK
• For the outdoor unit refrigerant piping, refer to the installation manual attached to the outdoor unit.
• Carry out insulation of both gas and liquid refrigerant piping securely. If not insulated, it may cause water
leakage. For gas piping, use insulation material of which heat resistant temperature is not less than
120°C.
For use under high humidity, strengthen the insulation material for refrigerant piping. If not strengthened,
the surface of insulation material may sweat.
• Before installation work, make sure that the refrigerant is R410A. (Unless the refrigerant is R410A, the
normal operation cannot be expected.)
CAUTION
This air conditioner is a dedicated model for new 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. 13.
• For the dimension of flared part and the tightening torque, refer to the
Table 3.
• When making a flare connection, coat the flared inner surface only with
ether oil or ester oil.
(Refer to Fig. 14)
Then, turn the flare nut 3 to 4 times with your hand and screw in the nut.
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.
Pipe size
Tightening torque (N·m)
Flare dimensions
A (mm)
Flare
ø6.4(1/4
”
)
15.7 ± 1.5
8.9 ± 0.2
ø12.7(1/2
”
)
54.9 ± 5.4
16.4 ± 0.2
Torque wrench
Flare nut
Piping union
Spanner
Fig. 13
Coat the flared inner
surface only with ether
oil or ester oil.
Fig. 14
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