Refrigerant Piping Work - Daikin FHQ35CAVEB Installation Manual

A
B
≤ 1°
A.B
A. When the drain piping is tilted to the right, or to the right
and back.
Place it level, or tilt it slightly to the right or the back.
(Within 1°)
B. When the drain piping is tilted to the left, or to the left
and back.
Place it level, or tilt it slightly to the left or the back.
(Within 1°)
WARNING
The indoor unit must be securely installed on a place
that can withstand the mass.
If the strength is insufficient, the indoor unit may fall down
and cause injuries.
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 normal opera-
tion cannot be expected.)
CAUTION
This air conditioner is a dedicated model for new refrigerant
R410A. Make sure to meet the requirements shown right
and carry out installation work.
• Use dedicated piping cutters and flaring tools for R410A.
• When making a flare connection, coat the flared inner sur-
face 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 pip-
ings.
Do not mix substance other than the specified refrigerant
such as air into the refrigeration circuit.
If the refrigerant leaks during the work, ventilate the room.
English
• Remove the stay for packing and delivering (reinforcing
plate) before refrigerant piping work.
(Refer to Fig. 18)
≤ 1°
• 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.13.
For the dimension of flared part, refer to the Table 1.
≤ 1°
Fig. 12
• When making a flare connection, coat the flared inner surface
only with ether oil or ester oil. (Refer to Fig. 14) Then, turn the
flare nut 3 to 4 times with your hand and screw in the nut.
• For the tightening torque, refer to the Table 1.
Table 1
Piping size
• Do not have oil adhere to the screw fixing part of resin
parts.
If oil adheres, it may weaken the strength of screwed part.
• Do not tighten flare nuts too tight.
If a flare nut cracks, the refrigerant may leak.
• If there is no torque wrench, use Table 2 as a rule of thumb.
When tightening a flare 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 2. After the work is finished, 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 2
Piping size
Torque wrench
Flare nut
Union joint
Coat the flared inner surface
only with ether oil or ester oil.
Fig. 14
Dimension
Tightening
for processing
(mm) torque (N·m)
flare A (mm)
 6.4
15.7 ± 1.5 8.9 ± 0.2
 9.5
36.3 ± 3.6 13.0 ± 0.2
 12.7
54.9 ± 5.4 16.4 ± 0.2
 15.9
68.6 ± 6.8 19.5 ± 0.2
CAUTION
Tightening angle
(mm)
 6.4
60° – 90°
9.5
60° – 90°
 12.7
30° – 60°
 15.9
30° – 60°
Spanner
Fig. 13
Flare shape
R0.4-0.8
Recommended arm length
of tool used
Approximately 150mm
Approximately 200mm
Approximately 250mm
Approximately 300mm
6