Daikin FHQ125CAVEB Installation Manual download pdf (Page 12)

11 English

• 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 mal-

function (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 or burn due to touching the piping, electric shocks or

a fire due to the wiring touching the piping.

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

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

Piping size (mm) Tightening angle Recommended arm length of tool used

φ 6.4 60° – 90° Approximately 150mm

φ 9.5 60° – 90° Approximately 200mm

φ 12.7 30° – 60° Approximately 250mm

φ 15.9 30° – 60° Approximately 300mm

R0.4-0.8

90˚±2˚

45˚±2˚

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Daikin FHQ125CAVEB Installation Manual Page 12