Daikin FCA71AV16, Installation Manual

Page: 13 / 67

• If there is no torque wrench, use Table 4 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 4.
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 4
Piping size (mm) Tightening angle Recommended arm length of tool used
<l> 6.4 60
°
- 90
°
approx. 150 mm
<p 9.5 60
°
- 90
°
approx. 200 mm
<p 12.7
30
°
- 60
°
approx. 250 mm
<p 15.9
30
°
- 60
°
approx. 300 mm
-&
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. 16, insulate both the gas and liquid piping connection with the attached
joint insulating for fitting (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 for fitting (8) and (9)
(flare nut section), both the gas and liquid piping.
• Make sure to bring the seam of joint insulating for fitting (8) and (9) to the top.
Gas Piping Insulation Procedure
Insulation for fitting (8)
(accessory)
-------� Piping insulation
Flare nut connection
Turn seams up
Do not expose the piping
in order to prevent the
vapor condensation
material (main unit)
Attach to base
Tighten the part other
than the piping insulation
material.
Liquid Piping Insulation Procedure
Insulation for fitting (9)
(accessory)
Flare nut connection
Turn seams up
Piping insulation
material
(Field supply)
Do not expose the piping
in order to prevent the
vapor condensation
Piping insulation
material (main unit)
Attach to base
=>
Clamp (4) (accessory)
Tighten the part other
than the piping insulation
material.
Wrap over from the
base of the unit to
the top of the flare
nut connection.
Sealing pad
medium-1 (11)
(accessory)
Wrap the
insulator around
the part from the
root.
��iM!�
Sealing pad
medium-2 (12)
(accessory)
12
Screw mounting part
of piping presser plate
(2 locations)
Fig.16