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6
English
6. REFRIGERANT PIPING WORK
• For the outdoor unit refrigerant piping, refer to the installa-
tion 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 250°F (120 °C).
For use under high humidity, strengthen the insulation ma-
terial for refrigerant piping. If not strengthened, the surface
of insulation material may sweat.
• Before installation work, make sure that the refrigerant is
R410A or operation will malfunction.
CAUTION
This air conditioner is a dedicated model for new re-
frigerantR410A.Makesuretomeettherequirements
shown below and carry out installation work.
• Usededicatedpipingcuttersandaringtoolsfor
R410A.
• Whenmakingaareconnection,coatthearedin-
ner surface only with ether oil or ester oil.
• Useonlythearenutsattachedtotheaircondition-
er.Ifotherarenutsareused,itmaycauserefriger-
ant leakage.
• To prevent contamination or moisture from getting
into the piping, take measures such as pinch ing or
taping the pipings.
Donotmixsubstanceotherthanthespeciedrefrig-
erant 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.10.
• For the dimension of ared part and the tightening
torque, refer to the Table 3.
• When making a are connection, coat the ared inner
surface only with ether oil or ester oil.
(Refer to Fig. 11)
Then, turn the are nut 3 to 4 times with your hand and
screw in the nut.
Torque wrench
Spanner
Flare nut
Union joint
Fig.10
Coat the flared inner surface
only with ether oil or ester oil
Fig. 11
Table 3
Piping
size
[in. (mm)]
Tightening
torque
[lbf·ft. (N·m)]
Dimension for
processing are
A [in. (mm)]
Flare shape
[in. (mm)]
f 3/8
(9.5)
24.1 – 29.4
(36.3±3.6)
0.504 – 0.520
(13.0±0.2)
R0.016-0.031
(0.4-0.8)
90°±2°
A
45°±2°
f 5/8
(15.9)
45.6 – 55.6
(68.6±6.8)
0.760 – 0.776
(19.5±0.2)
CAUTION
• Donotexcessivelytightenthearenut.
Doing so will break the are nut and refrigerant leakage
may occur.
• Makesurethatallpartsaroundthearearefreeof
oil.
The drain pan and the resin part may be deteriorated if
oil is attached.
CAUTION
Insulationofeldpipingmustbecarriedoutuptothe
connection inside the casing.
If the piping is exposed to the atmosphere, it may cause
sweating, burn due to touching the piping, electric shocks
or a re due to the wiring touching the piping.
• After leak test, referring to Fig. 12, insulate both the
gas and liquid piping connection with the attached joint
insulating material (8) and (9) to prevent the pipings from
getting exposed.
Then, tighten the both ends of insulating material with
the clamp (4).
• Wrap the sealing material (Medium-1, 2) (11) (12) around
the joint insulating material (8) and (9) (are nut section),
both the gas and liquid piping.
• Make sure to bring the seam of joint insulating material
(8) and (9) to the top.
01_EN_3P161684-9U.indd 6 8/8/2018 15:26:51
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