English 5
(5) Tighten the upper nut.
(6) Apply the insulation for
hanger bracket to the hanger
bracket installation bolts of the
units.
(4 locations). (See figure on
right.)
(7) After setting up the unit, be sure to remove the positioning
jig for installation.
• For a newly built ceiling, carry out the same procedure and
be sure to establish thorough communication with those who
are to do the ceiling work. The positioning jig for installation
and paper pattern for installation have been adjusted to the
dimensions of the ceiling opening.
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 mate-
rial 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 opera-
tion cannot be expected.)
This air conditioner is a dedicated model for new refrig-
erant R410A. Make sure to meet the requirements 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 pinching or
taping the pipings.
Do not mix substance other than the specified refriger-
ant 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. 1.
• For the dimension of flared part and the tightening torque,
refer to the Table 3.
• When making a flare connection, coat the flared inner sur-
face only with ether oil or ester oil.
(Refer to Fig. 2)
Then, turn the flare nut 3 to 4 times with your hand and screw
in the nut.
Over-tightening may damage the flare and cause a refriger-
ant leakage.
Use “ Table 4 ” as a reference if a torque wrench is not available.
Once work is complete, make sure there is no gas leaking. As
the flare nut is tightened with the wrench, the torque will sud-
denly increase. From that position, tighten the nut to the angle
shown on “ Table 4 ”.
• Make absolutely sure to execute heat insulation works on the
pipe-connecting section after checking gas leakage by thor-
oughly studying the following figure and using the attached
heat insulating materials for fitting. (Fasten both ends with
the clamps (accessory).)
• Wrap the sealing pad (accessory) only around the insulation
for the joints on the gas piping side.
Be sure to insulate any field piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
Vinyl tube
Level
Insulation for
hanger bracket
(accessory)
Fig. 1
Coat the flared inner surface only with
ether oil or ester oil.
Torque wrench
Spanner
Piping union
Flare nut
Fig. 2
Small sealing pad
(accessory)
(accessory)
Gas pipe
Liquid pipe
Insulation
for fitting
Clamp
(× 6 accessory)
01_EN_3P258319-8N.fm Page 5 Tuesday, February 19, 2019 1:06 PM
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