Refrigerant Piping Work - Daikin FCQ24TAVJU Installation Manual

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-
frigerant R410A. Make sure to meet the require m ents
shown below and carry out installation work.
• Use dedicated piping cutters and flaring tools for
R410A.
• When making a flare connection, coat the flared in-
ner surface only with ether oil or ester oil.
• Use only the flare nuts attached to the air condition-
er. If other flare nuts are used, it may cause refriger-
ant 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 refrig-
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 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. 11)
Then, turn the flare nut 3 to 4 times with your hand and
screw in the nut.
Torque wrench
Flare nut
Union joint
Fig. 10
Coat the flared inner surface
only with ether oil or ester oil
Fig. 11
English
Table 3
Piping
size
[in. (mm)]
f 3/8
(9.5)
f 5/8
(15.9)
• Do not excessively tighten the flare nut.
• Make sure that all parts around the flare are free of
Insulation of field piping must be carried out up to the
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 fire due to the wiring touching the piping.
• After leak test, referring to Fig. 12, insulate both the
• Wrap the sealing material (Medium-1, 2) (11) (12) around
• Make sure to bring the seam of joint insulating material
Spanner
Tightening Dimension for
torque processing flare
[lbf·ft. (N·m)] A [in. (mm)]
24.1 – 29.4 0.504 – 0.520
(36.3±3.6) (13.0±0.2)
45.6 – 55.6 0.760 – 0.776
(68.6±6.8) (19.5±0.2)
CAUTION
Doing so will break the flare nut and refrigerant leakage
may occur.
oil.
The drain pan and the resin part may be deteriorated if
oil is attached.
CAUTION
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).
the joint insulating material (8) and (9) (flare nut section),
both the gas and liquid piping.
(8) and (9) to the top.
Flare shape
[in. (mm)]
R0.016-0.031
(0.4-0.8)
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