Daikin FXFQ25SVM - Page 8

Donotmixsubstanceotherthanthespecied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. 10.
• Forthedimensionofaredpartandthetighteningtorque,
refer to the Table 2.
• 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 2
Piping
size
(mm)
Tightening
torque
(N·m)
Dimension for
processing flare
A (mm)
Flare shape
f
6.4
15.7 ± 1.5 8.9 ± 0.2
R0.4-0.8
90°±2°
A
45°±2°
f 9.5
36.3 ± 3.6 13.0 ± 0.2
f
12.7
54.9 ± 5.4 16.4 ± 0.2
f
15.9
68.6 ± 6.8 19.5 ± 0.2
CAUTION
Donothaveoiladheretothescrewxingpartofresin
parts.
If oil adheres, it may weaken the strength of screwed part.
Donottightenarenutstootight.
If a flare nut cracks, the refrigerant may leak.
• If there is no torque wrench, use Table 3 as a rule of
thumb.
Whentighteningaarenutwithaspannerharderand
harder, there is a point where the tightening torque sud-
denly increases.
From that position, tighten the nut additionally the angle
shown in Table 3.
Aftertheworkisnished,checksecurelythatthereisno
gas leak.
If the nut is not tightened as instructed, it may cause slow
refrigerant leak and result in malfunction (such as does
not cool or heat).
Table 3
Piping size
(mm)
Tightening
angle
Recommended arm length of
tool used
f 6.4 60° - 90° approx. 150 mm
f 9.5 60° - 90° approx. 200 mm
f 12.7 30° - 60° approx. 250 mm
f 15.9 30° - 60° approx. 300 mm
CAUTION
Insulationofeld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 gas
and liquid piping connection with the attached joint in-
sulating 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.
7 3P335596-2D English