Daikin FXFSQ-AVM, Engineering Data

Page: 43 / 56

FXFSQ-AVM EDFMT391769A
41
3P468397-1D
8
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
material 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 nor mal
operation cannot be expected.)
CAUTION
This air conditioner is a dedicated model for new
refrigerant R410A. Make sure to meet the requirement s
shown below and carry out installation work.
• Use dedicated piping cutters and tools for
R410A.
• When making a connection, coat the inner
surface only with ether oil or ester oil.
• Use only the nuts attached to the air conditioner.
If other nuts are used, it may cause refrigerant
leakage.
• To prevent contamination or moisture from gettin g
into the piping, take measures such as pinch ing o r
taping the pipings.
D o no t mi x substanc e othe r tha n th e specified
refrigerant such as air into the refrigeration circuit .
If the refrigerant leaks during the work, ventilate th e
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 part and the tightening torque,
refer to the Table 3.
For flare nut, use the mounting one to the body.
•
When making a connection, coat the inner
surface only with ether oil or ester oil.
(Refer
to Fig. 11)
Then, turn the 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 surf ace
only with ether oil or ester oil
Fig. 11
Table 3
Piping
size
(mm)
Tightening
torque
(N·m)
Dimension for
processing flare
A (mm)
Flare shape
φ 6.4
15.7 ± 1.5 8.9 ± 0.2
R0.6
±
0.2
90°±2°
A
45°±2°
φ
9.5
36.3 ± 3.6 13.0 ± 0.2
φ 12.7 54.9 ± 5.4 16.4 ± 0.2
φ 15.9
68.6 ± 6.8 19.5 ± 0.2
CAUTION
Do not have oil adhere to the screw part of resin
parts.
If oil adheres, it may weaken the strength of screwed part.
Do
not tighten nuts too tight.
If a flare nut cracks, the refrigerant may leak.
• If there is no torque wrench, use Table 4 as a rule of
thumb.
When tightening a
nut with a spanner harder and
harder, there is a point where the tightening torque
suddenly increases.
From that position, tighten the nut additionally the angle
shown in Table 4.
After the work is
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 4
Piping size
(mm)
Tightening
angle
Recommended arm length of
tool used
φ
6.4 60° - 90° approx. 150 mm
φ 9.5 60° - 90° approx. 200 mm
φ
12.7 30° - 60° approx. 250 mm
φ
15.9 30° - 60° approx. 300 mm
CAUTION
Insulation of 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
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)
nut section),
both the gas and liquid piping.
• Make sure to bring the seam of joint insulating material (8)
and (9) to the top.