7
English
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.
• Remove the stay for packing and delivering (reinforcing
plate) before refrigerant piping work.
(Refer to Fig. 18)
• 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.
•
When making a flare connection, coat the flared inner sur-
face 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
CAUTION
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
CAUTION
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. 15
, insulate both the gas and
liquid piping connection with the attached joint insulating
material (6) and (7) to prevent the pipings from getting
exposed.
Then, tighten the both ends of insulating material with the
clamp (4).
•
Wrap the sealing material (Small) (9) around the joint insulat-
ing material (6) (flare nut section), only the gas piping side.
•
Make sure to bring the seam of joint insulating material (6)
and (7) to the top.
Piping size
(mm)
Tightening
torque (N·m)
Dimension for
processing
flare A (mm)
Flare shape
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
Torque wrench
Spanner
Flare nut
Union joint
Fig. 13
Coat the flared inner surface
only with ether oil or ester oil
Fig. 14
R0. 4-0.8
90°±2°
A
45°±2°
Piping size
(mm)
Tightening angle
Recommended arm length of
tool used
6.4
60° – 90°
Approximately 150mm
9.5
60° – 90°
Approximately 200mm
12.7
30° – 60°
Approximately 250mm
15.9
30° – 60°
Approximately 300mm
01_EN_3P368557-2D.fm Page 7 Wednesday, February 13, 2019 2:46 PM
