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7 English
CAUTION
• Use the level and check that the unit is installed horizontally.
(4-directions)
• In the case of using a vinyl tube (filled with water) in place of
the level, align the bottom of the unit to the water surface at
both edges of the vinyl tube to make levelness adjustment.
If the unit is installed at a slant with the drain pipe side set
high, in particular, the float switch will not operate normally
and water leakage may result.
6. REFRIGERANT PIPING WORK
As for the refrigerant piping of the outdoor unit, refer to the
installation manual provided to the outdoor unit.
Perform thermal insulation work on both gas piping and
liquid piping, or otherwise water leakage may result.
Use the insulation material that withstands a temperature
of 250°F (120°C).
Reinforce the insulation material for the refrigerant piping if
the ambient temperature is high, or otherwise dew conden-
sation may result on the surface of the insulation material.
Make sure that the refrigerant is R410A before refrigerant
piping work. If the refrigerant is different, the air condi-
tioner will not operate normally.
CAUTION
This product uses new refrigerant (R410A) only. Be sure to
keep the following items and conduct the installation work.
• Use a dedicated pipe cutter and a flaring tool for R410A.
• When connecting the flare, apply ether oil or ester oil
only to inner side of the flare.
• Be sure to use the flare nut provided with the unit. (Do
not use a different flare nut (such as a type-1 flare nut),
or otherwise refrigerant leakage may result.)
• To prevent contamination or moisture from getting into
the piping, take measures such as pinching or taping the
ends of the pipes.
• Be sure to use the specified type of refrigerant for the
refrigeration cycle and do not contaminate the refrigerant
with air.
• Ventilate the room in case of refrigerant leakage during
installation work.
(1) Connect the piping.
• The refrigerant is pre-charged in the outdoor unit.
• When connecting or disconnecting piping to or from the
unit, be sure to use a spanner and a torque wrench.
(Refer to Fig. 4)
• Refer to Table 1 for the processing dimensions of the
flare.
• Use the flare nut provided with the unit.
• Apply ether oil or ester oil only to inner side of the
flare and screw in the flare nut three to four turns first by
hand at the time of connecting the flare nut.
(Refer to Fig. 5)
• Refer to Table 1 for the corresponding tightening torque.
Table 1
CAUTION
• Do not excessively tighten the flare nut.
Doing so will break the flare nut and refrigerant leakage may
occur.
• Make sure that all parts around the flare are free of oil.
The drain pan and the resin part may be deteriorated if oil is
attached.
Piping
size
[in. (mm)]
Tightening
torque
[lbf·ft. (N·m)]
Dimension for
processing flare
A [in. (mm)]
Flare shape
[in. (mm)]
3/8
(9.5)
24.1 – 29.4
(36.3±3.6)
0.504 – 0.520
(13.0±0.2)
5/8
(15.9)
45.6 – 55.6
(68.6±6.8)
0.760 – 0.776
(19.5±0.2)
Torque wrench
Spanner
Piping union
Flare nut
Fig. 4
Fig. 5
Apply ester oil or ether oil
only to inner side of flare.
R0.016-0.031
(0.4-0.8)
A
01_EN_3P530815-1.fm Page 7 Tuesday, July 10, 2018 6:20 PM
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