Daikin FXHQ32AVEB Installation Manual page 11

• 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 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.
Flare nut
Union joint
• For the tightening torque, refer to the Table 1.
Table 1
Piping size (mm)
φ 6.4
φ 9.5
φ 12.7
φ 15.9
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 mal-
function (such as does not cool or heat).
Table 2
Piping size (mm)
φ 6.4
φ 9.5
φ 12.7
φ 15.9
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.
English
Torque wrench
Spanner
Fig. 13
Tightening torque (N·m)
15.7 ± 1.5
36.3 ± 3.6
54.9 ± 5.4
68.6 ± 6.8
Tightening angle
60° – 90°
60° – 90°
30° – 60°
30° – 60°
Coat the flared inner surface
only with ether oil or ester oil
Fig. 14
Dimension for processing
flare A (mm)
8.9 ± 0.2
13.0 ± 0.2
16.4 ± 0.2
19.5 ± 0.2
Recommended arm length of tool used
Approximately 150mm
Approximately 200mm
Approximately 250mm
Approximately 300mm
Flare shape
R0. 4-0.8
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